JP6572650B2 - Wet fire extinguishing method for red hot coke - Google Patents

Description

The present invention also relates to the wet quenching how the red-hot coke.

  Methods for extinguishing red hot coke carbonized in a coke oven are roughly classified into wet fire extinguishing and dry fire extinguishing. In dry fire extinguishing, red hot coke that has been carbonized in a coke oven is temporarily received in a coke loading box that is pulled by a fire extinguisher freight car, this fire freight car is transported to the dry fire extinguishing equipment, and red hot coke is put into the dry fire extinguishing equipment. It is done by doing. In dry fire extinguishing, red hot coke is extinguished by an inert gas such as nitrogen, and can be made into coke containing almost no moisture. However, because dry fire extinguishing is complicated, wet fire extinguishing is still being carried out by sprinkling red hot coke mounted in a coke-mounted box.

(Coke moisture and equipment burnout)
The biggest problem with wet fire extinguishing is that the fire extinguishing becomes uneven and the coke remains red hot. Spots that cannot be extinguished sufficiently are spotted due to variations in the packaging (layer height) of reddish coke that is removed from the coke oven and received on the coke loading box. When coke that remains red hot is placed on a belt conveyor, there is a concern that the belt conveyor may burn out, leading to a major disaster. As a method of surely extinguishing red-hot coke, a method of sprinkling excess water is used.

(Dry air cooling time in the wharf)
The wet fire extinguished coke is discharged to a place called a wharf and dried and air-cooled. The dry air-cooling time is generally said to be 30 to 40 minutes as described in Patent Document 1. Yes. While being dried and air-cooled, water contained in the coke is evaporated by sensible heat of the coke itself. On the other hand, high temperature coke is air cooled. If red hot coke remains, the fire is extinguished by watering the wharf. For this reason, 30 to 40 minutes have been required for the dry air cooling treatment time. In addition, it may be possible to reduce the cooling time by sprinkling high temperature coke at the wharf. However, in order to sprinkle the wharf, install or monitor a wharf sprinkler as in Patent Document 2. There is a need to keep people on standby at all times.

(Coke temperature control and sprinkling control after fire extinguishing)
From the viewpoint of ensuring fire extinguishing, the maximum temperature of coke should be low, and from the viewpoint of reducing moisture, the minimum temperature should be as high as possible. Needless to say, in order to achieve these two conflicting objectives, it is necessary to reduce the difference between the maximum temperature and the minimum temperature.
From the viewpoint of moisture reduction, the minimum temperature (lower limit temperature) of coke after wet extinguishing is important. Of course, it is desirable that the minimum temperature be 100 ° C., which is the boiling point of water, or a temperature close to it. However, if the control value of the minimum temperature is increased, the coke temperature rises as a whole, and the temperature partially rises excessively, and there is a concern that the subsequent blast furnace conveyor belt may be burned out. Therefore, the minimum temperature of coke discharged to the wharf should be controlled as low as possible. From that point of view, it should be verified to what extent the minimum temperature can be lowered.

  In patent document 3, the model for calculating | requiring the watering time and the watering flow volume for making the water | moisture content of the coke after fire extinguishing into a target value is constructed | assembled. In this model, the average particle size of the coke used for the operation is a single particle, and until the particle surface temperature drops below 100 ° C. where water can be evaporated, evaporation occurs vigorously on the particle surface. Although it does not absorb moisture, it is assumed that when the surface temperature falls below 100 ° C., it begins to absorb moisture and the water content becomes maximum at the end of watering. In addition, after the end of watering, the heat is recovered by the heat in the coke particles, and gradually goes to the temperature equilibrium state while releasing the absorbed water.

(Measurement of coke temperature and bed height after fire extinguishing)
In Patent Document 4, after the red hot coke is sprinkled and cooled, the temperature distribution and / or the layer height distribution of the fire extinguished coke mounted in the coke mounting box is measured immediately before being discharged to the wharf. After discharging to the wharf, the coke mounting box is newly loaded with red hot coke and sprinkled and cooled, but the water distribution conditions at that time have already been discharged to the wharf and / or the temperature distribution and / or layer It is proposed to adjust based on the high distribution. In addition, it is also described that the temperature distribution and / or the bed height distribution of newly installed reddish coke is measured inside the fire extinguisher as necessary.

(About fire extinguishing equipment)
The fire extinguishing wagon loaded with red hot coke pushed out from the carbonization chamber is moved to the fire extinguishing equipment and cooled by sprinkling, but the fire extinguishing equipment is limited to the end of the coke oven. This is because the coke guide wheel used to push out the red hot coke from the carbonization chamber interferes with the fire extinguishing equipment, and if the fire extinguishing equipment is located at the center of the coke oven, it becomes an obstacle to the movement of the coke guide car. When the fire extinguishing equipment is installed at the end of the coke oven, the travel time from the extrusion kiln far away from the fire extinguishing equipment to the fire extinguishing equipment becomes longer, extruding work, moving from the extrusion kiln to the fire extinguishing equipment, extinguishing red hot coke, extinguishing fire It takes a long time for a series of tasks such as paying out coke to the wharf, which is not efficient. It may be difficult to produce the required coke in the blast furnace. In addition, red hot coke is burned off from the surface within the running time, causing a reduction in coke yield.

JP-A-5-320656 JP-A-64-40595 Japanese Patent No. 4281497 JP 2006-241370 A

(Challenges about water content of coke after fire extinguishing and equipment burnout)
Excess watering to reliably extinguish red hot coke causes the water content of the coke to rise after the fire extinguishes, causing the heat source unit and furnace conditions in the blast furnace to deteriorate. It is desirable that the water content of the coke put into the blast furnace is 5% by mass or less. In other words, it is also required that the red coke be surely extinguished, and at the same time, the water content of the coke is not increased after extinguishing.

(Issues about drying and air-cooling treatment at Wharf)
A wide wharf area is required for dry air cooling in the wharf. In some factories, it may be difficult to provide a large area for the wharf. For this reason, it is desirable that the drying air cooling time in the wharf be within 20 minutes. Although it is conceivable to spray water locally on the coke having a high temperature in the wharf to shorten the cooling time, the installation of the wharf watering device described in Patent Document 2 is expensive. Moreover, it is labor-intensive to make a supervisor always stand by.

(Challenges about temperature control and sprinkling control of coke after fire extinguishing)
It is desired to keep the water content of coke supplied to the blast furnace low and to shorten the drying and air cooling time in the wharf. In the present invention, the water content of the coke supplied to the blast furnace is targeted to be 5% by mass or less within 20 minutes of the drying and air cooling treatment time in the wharf.
From the viewpoint of ensuring fire extinguishing, the maximum temperature of coke should be low, and from the viewpoint of reducing moisture, the minimum temperature should be as high as possible.
However, the amount of reddish coke received in the coke-mounted box is extremely large, around 20 tons, and it is very difficult to make the coke temperature uniform after fire extinguishing. A management temperature range that can be practically controlled should be determined on the assumption that the temperature becomes non-uniform.
In the said patent document 3, the model for calculating | requiring the watering time and the watering flow rate for making the water | moisture content of the coke after fire extinguishing into a target value is constructed | assembled. However, there is no description of a specific temperature for reducing the water content of the coke supplied to the blast furnace to 5% by mass or less within 20 minutes of the drying and air-cooling treatment time in the wharf.

(Challenges for measuring coke temperature and bed height after fire extinguishing)
In Patent Document 4, after the red hot coke is sprinkled and cooled, the temperature distribution and / or the layer height distribution of the fire extinguished coke mounted in the coke mounting box is measured immediately before being discharged to the wharf. However, it takes time to measure the height distribution of the entire surface of the coke-carrying box and reflect it in the sprinkling conditions, completing one cycle of receiving the coke, sprinkling fire, and dispensing to the wharf. It will take longer to do. As a result, coke productivity is reduced. In addition, the installation location of the measuring device must be taken into consideration. In this case, it is necessary to measure the entire receiving surface of the coke mounting box, and it is necessary to provide a certain distance between the receiving surface and the measuring device. When installing in an existing coke oven, it is assumed that there is a space for installation of measuring equipment above the coke mounting box. In addition, since the area around the coke box is dusty and the temperature is high, protection of measuring equipment must be considered. For these reasons, it is difficult to measure the height distribution and temperature distribution of coke in a coke-mounted box, and without making these measurements, the red-hot coke is reliably extinguished and dry air-cooled in the wharf. It is required to produce coke having a water content of 5% by mass or less under the condition that the treatment time is within 20 minutes.

(Issues regarding fire extinguishing equipment)
In the conventional coke oven, the installation place of the fire extinguishing equipment is limited to the end of the coke oven in order to avoid interference with the coke guide car. The reason why the fire extinguishing equipment interferes with the coke guide car is because the dust collecting hood of the coke guide car, the side walls (three sides) of the fire extinguishing chamber, and the water sprinkling pipes interfere with each other. If these equipment interferences can be avoided, the fire extinguishing equipment can be installed in the center of the furnace group, and the time required for the red hot coke pushed out from the coke kiln to move to the fire extinguishing equipment by the fire extinguishing wagon can be shortened. By shortening the travel time, the time required for a series of operations such as extrusion work, moving from an extrusion kiln to fire extinguishing equipment, extinguishing red hot coke, and discharging fire extinguishing coke to the wharf can be greatly shortened. Can be produced.

Moreover, since the travel distance of the fire extinguishing wagon and the coke-carrying bucket is shortened, the fuel cost for running the fire extinguishing wagon can be reduced.
In addition, coke ovens have many aging facilities, and abnormalities may occur in the rails on which fire extinguishing wagons and coke loaded buckets travel. Even in such a case, when there is a fire extinguishing wagon on the side of the carbonization chamber opposite to the rail where the abnormality has occurred, the extrusion from the coking chamber and the traveling of the fire extinguishing wagon can be continued.

  In addition, the movement from the carbonization chamber far away from the fire extinguishing equipment increases the running time from the extrusion kiln to the fire extinguishing equipment, and the red hot coke is burned off from the surface within the running time, causing the coke yield to decrease. By shortening the moving time, burning / burning from the surface of the red hot coke can be reduced.

An object of the present invention is to reduce the coke moisture by increasing the coke temperature after wet fire extinguishing, and to control the coke temperature to an extent that does not exceed the heat resistance temperature of the equipment, thereby achieving equipment maintenance. In addition, by installing fire extinguishing equipment in the center of the furnace group and shortening the travel time from the fire extinguishing freight car to the fire extinguishing equipment, coke necessary for blast furnace operation is reliably produced, and from the extrusion kiln to the fire extinguishing equipment. It is to prevent the yield reduction due to burning and burning of red hot coke while moving.
An object of the present invention reduces the coke moisture, and is to provide a wet quenching how the red hot coke to control the coke temperature to an extent not exceeding the facilities heat resistance temperature.

The gist of the present invention is as follows.
(1) After receiving the red hot coke pushed out from the carbonization chamber in the coke mounting box towed by the fire extinguishing freight car, the water is sprayed from the water sprinkling pipe in the fire extinguishing equipment to the red hot coke existing area in the coke mounting box. a method of extinguishing a red hot coke by, after extinguishing completed, the minimum temperature of the coke to be paid out to the Wharf, and at 60 ° C. or higher, the maximum temperature, 400 ° C. or Wharf subsequent conveyance equipment heat resistance temperature + 165 temperature ° C., A wet-fire extinguishing method for red hot coke, which is lower than the lower one of the above.
(2) The wet-fire extinguishing method for red hot coke according to (1), wherein the minimum temperature is 60 ° C. or higher and 80 ° C. or lower.
(3) The wet heat extinguishing method for red hot coke according to (1) or (2), wherein the heat resistance temperature of the transfer facility is 150 ° C. or higher and 250 ° C. or lower.
(4) When the red hot coke existing range in the coke mounting box is divided into the extinguishing freight car traveling direction into the end A, the center, and the end B, the water spray amount to the end A and the end B is The wet-fire extinguishing method for red hot coke according to any one of (1) to (3), wherein the amount of water sprayed to the section is 0.4 or more and 0.8 or less.
(5) When the total length in the width direction of the coke mounting box is 1, the sprinkling in the width direction of the coke mounting box at the end A and the end B starts from the upper end of the inclined bottom plate of the coke mounting box. The wet-fire extinguishing method for red hot coke according to any one of (1) to (4), wherein the wet fire extinguishing method is performed only in a range of 0.0 to 0.8.
(6) When extruding red hot coke from the carbonization chamber to the coke loading box, a temperature sensor is permanently installed at the tip of the pusher ram equipped in the extrusion device, and the temperature in the carbonization chamber at the time of extrusion is measured. In addition, the method for wet fire extinguishing of red hot coke according to any one of (1) to (5), wherein the sprinkling flow rate of red hot coke is adjusted.
(7) Directly above or near the lower end of the inclined bottom plate of the coke-mounted box at different heights of 2 to 4 steps toward the red hot coke received in the coke-mounted box Fire extinguishing water is sprinkled obliquely downward from the water sprinkling pipe, the red hot coke wet fire extinguishing method according to any one of (1) to (6).
(8) The wet-fire extinguishing method for red hot coke according to (7), wherein the sprinkling flow rate per 1 m ² during the sprinkling treatment is 0.5 t / min or more and 1.5 t / min or less on average.
(9) When the red-hot coke existing range in the coke-mounted box is divided into three sections, an end A, a center, and an end B, in the extinguishing freight car traveling direction, the end A, the center, and the end B The sprinkling pipe is connected via a loose flange, and the sprinkling angle of the sprinkling pipe is set for each location, The wet-fire extinguishing method for red hot coke according to (7) or (8).
(10) Any one of (7) to (9), wherein a watering angle of the watering pipe in the central part is downward with respect to a watering angle of the end part A and the end part B. A wet fire extinguishing method for red hot coke as described in 1.
(11) The wet-fire extinguishing method for red hot coke according to any one of (7) to (10), wherein the internal pressure of the watering pipe during watering treatment is 10 kPa or more and 40 kPa or less .
Here, “The fire extinguishing equipment is located at the central position of the coke oven group” means that the combustion chamber and the carbonization chamber are alternately arranged in a plurality, and the central position of the coke oven group sharing the same mobile unit. This means installing fire extinguishing equipment.

  By increasing the coke temperature after wet fire extinguishing, the coke moisture can be reduced, and the coke temperature can be controlled so as not to exceed the heat resistance temperature of the equipment, thereby maintaining the equipment. Moreover, the fire extinguishing equipment can be installed in the center of the furnace group, and the travel distance and travel time of the fire extinguishing wagon from the extrusion kiln to the fire extinguishing equipment can be greatly reduced. As the travel time is shortened, the time required for a series of operations such as extrusion work, transfer from extrusion kiln to fire extinguishing equipment, fire extinguishing of red hot coke, and discharge of fire extinguishing coke to the wharf can be greatly shortened, and coke necessary for blast furnace operation Can supply. It is also possible to prevent a decrease in yield due to burning and burning of red hot coke while moving from the extrusion kiln to the fire extinguishing equipment. Moreover, since the travel distance of the fire extinguishing wagon and the coke-carrying bucket is shortened, the fuel cost of the fire extinguishing wagon can be reduced.

  Furthermore, the coke oven has many aging facilities, and abnormalities may occur in the rail t on which the fire extinguishing wagon and the coke-mounted bucket travel. Even in this case, if fire extinguishing equipment is installed in the center of the furnace group, if there is a fire extinguishing wagon on the side of the carbonization chamber opposite to the rail where the anomaly has occurred, the extrusion from the carbonization chamber and the running of the fire extinguishing wagon It is possible to continue.

The figure which shows the relationship between the drying air cooling process time in a wharf, and coke moisture. The figure which shows the temperature change of the coke by the dry air cooling process of coke. The figure which shows the equipment composition from extruding red hot coke from one room of a plurality of carbonization rooms, and conveying it to a blast furnace The figure which shows the cross section of the deployment state of the moving apparatus relevant to a coke oven carbonization chamber. The figure which looked at the state by which the fire-fighting wagon 4 was drawn in to the fire-extinguishing equipment 7 from the advancing direction (front-back direction) of the fire-fighting wagon. The figure which looked at the state by which the fire-fighting wagon 4 was drawn in to the fire-extinguishing equipment 7 from the perpendicular | vertical position (lateral direction) with respect to the advancing direction of a fire-fighting wagon. The figure which looked at the state by which the fire extinguishing freight car 4 was drawn in the fire extinguishing equipment 7 from the advancing direction (front-back direction) of the fire extinguishing freight car in the 2nd embodiment. The figure which shows the watering hole of watering piping in 2nd Embodiment. The figure which shows the temperature of each coke immediately after the start of discharge | payout at the time of paying out to a wharf from the coke mounting box 5, the middle period of discharge | payout, and the latter half of discharge | payment (Test example 3-1). The figure which shows the temperature of each coke immediately after the start of discharge | payout at the time of paying out to a wharf from the coke mounting box 5, the middle period of discharge | payout, and the latter half of discharge | payment (Test Example 3-2). The figure which shows the temperature of each coke immediately after the start of discharge | payout at the time of paying out to a wharf from the coke mounting box 5, the middle period of discharge | payout, and the latter half of discharge | payout (invention example 3-1). The figure which shows the temperature distribution of the coke paid out to a wharf (Test Example 3-1). The figure which shows the temperature distribution of the coke paid out to a wharf (Test Example 3-2). The figure which shows the temperature distribution of the coke paid out to a wharf (invention example 3-1). The figure which installed fire extinguishing equipment at the end of a furnace group. The figure which installed fire extinguishing equipment in the central part of the furnace group.

Hereinafter, embodiments of the present invention will be described in detail.
<First Embodiment>
According to a first embodiment of the present invention, in wet fire extinguishing of red hot coke, the minimum and maximum temperatures of coke after watering are controlled, and the watering method is improved to reduce coke moisture, and coke It is the embodiment which aims at maintenance of conveyance equipment.

  FIG. 3 shows an equipment configuration from the time when red hot coke is extruded from one chamber of a plurality of carbonization chambers to the blast furnace. The red hot coke 3 pushed out from the carbonization chamber 1 is received by a coke mounting box 5 pulled by the fire extinguishing freight car 4. The coke mounting box 5 on which the red hot coke 3 is mounted travels on the rail 6, moves to the fire extinguishing equipment 7, and is wet extinguished by watering. After the fire extinguishing of the red hot coke 3 is completed, the fire extinguishing wagon 4 is moved from the fire extinguishing equipment 7 to the wharf, the discharge gate of the coke-mounted box 5 is opened, and the wet fire extinguished coke is processed into the wharf 8-1, 8-2, and 8- Pay to one of the three. After being dispensed to the wharf 8, the moisture contained in the coke is evaporated by a dry air cooling process. The coke is air-cooled and reaches a temperature at which the conveyance facility 10 (belt conveyor) is not burned. The dry air cooling process in the wharf 8 is generally said to be about 30 to 40 minutes, but in the present invention, the dry air cooling process is performed within 20 minutes. Then, after wet fire extinguishing, the water content of the coke 9 supplied to the blast furnace is set to 5 mass% or less, and the temperature is set so as not to burn the transport equipment 10 to the blast furnace.

  The dry air-cooling treatment time here is defined as the time from when the coke is discharged from the coke-mounted box 5 to the wharf 8 and when the coke starts to be discharged from the wharf to the transport facility 10 for the next blast furnace.

(Coke temperature control after fire extinguishing)
In wet fire extinguishing of red hot coke according to the present invention, the minimum temperature of coke delivered to the wharf after extinguishing is 60 ° C. or higher, and the maximum temperature exceeds 400 ° C. or 165 ° C. higher than the heat resistance temperature of the transport equipment downstream of the wharf. Manage below the lower temperature. By setting the minimum temperature to 60 ° C. or higher, coke having a moisture content of 5% by mass or less can be produced even when the drying and air cooling time in the wharf is within 20 minutes.

  As will be described later, in the wharf, the coke has decreased by 166 ° C. after 20 minutes, and if the range exceeding the heat resistance temperature of the transport facility is controlled to 165 ° C. or less, the heat resistance temperature of the transport facility will not be exceeded. However, even if the range exceeding the heat resistance temperature of the transfer facility is 165 ° C or less, it must be 400 ° C or less. When the temperature when being discharged to the wharf exceeds 400 ° C., the coke is discharged in a red hot state. Coke that remains red hot is easily burned by contact with air. Therefore, even if the coke temperature decreases at the wharf, there is a concern that it may burn in the subsequent equipment and cause a disaster. That is, the maximum temperature of the coke discharged to the wharf should be 400 ° C. or less, preferably 350 ° C. or less, regardless of the heat-resistant temperature of the belt. Therefore, the maximum temperature of the coke discharged to the wharf after the completion of fire extinguishing is controlled to be lower than 400 ° C. or a temperature exceeding 165 ° C. higher than the heat resistance temperature of the conveying equipment at the latter stage of the wharf.

Moreover, even if the maximum temperature is the belt heat resistant temperature plus 165 ° C. or lower or 400 ° C. or lower of the belt conveyor, there is a concern that the temperature does not drop sufficiently when the ratio of the temperature close to that is high. Therefore, it should be considered as a precondition that 90% or more of the whole is the belt heat resistant temperature plus 100 ° C. or less of the belt conveyor.
Here, the temperature of the coke after wet fire extinguishing is the temperature of coke discharged to the wharf after wet fire extinguishing. The temperature measurement of the coke delivered to the wharf can be easily performed with a better measurement environment than the temperature measurement in the coke-mounted box. In addition, if the temperature is measured with an infrared thermoviewer capable of continuous measurement, the temperature of the coke delivered to the entire surface of the wharf can be measured continuously, compared with the temperature measurement in the coke-mounted box, the temperature of the coke after wet extinguishing. Can know exactly.

  It is preferable to manage the minimum temperature of the coke after fire extinguishing delivered to the wharf in the range of 60 ° C to 80 ° C. It is desirable that the minimum temperature be 100 ° C., which is the boiling point of water, or a temperature close to it. However, if the control value of the minimum temperature is increased, the coke temperature rises as a whole, and the temperature partially rises excessively, and there is a concern that the subsequent blast furnace conveyor belt may be burned out. If the minimum temperature of the coke after fire extinguishing is set to 80 ° C. or less, it is possible to avoid an accident that burns the blast furnace conveyor belt in the subsequent stage.

The heat resistance temperature of the transfer equipment to the blast furnace is set to 150 ° C. or more and 250 ° C. or less.
From the viewpoint of surely extinguishing the fire, the maximum temperature of the coke should be low, but from the viewpoint of reducing moisture, the minimum temperature needs to be as high as possible. However, the amount of red hot coke received in the coke-mounted box is extremely large, about 20 tons, and it is extremely difficult to make the coke temperature uniform after fire extinguishing. It should be considered on the assumption that the temperature will be non-uniform. For this reason, many cokes exceeding 100 ° C. are included in the coke paid out to the transport facility. Therefore, the heat-resistant temperature of the transportation equipment to the blast furnace needs to be 150 ° C. or higher. Thereby, even if the coke exceeding 100 degreeC is discharged | emitted by the belt, burnout can be suppressed. However, it is not necessary to make it higher than 250 ° C. If the heat-resistant temperature is 250 ° C., the temperature of the coke discharged from the coke mounting box to the wharf can correspond to a maximum of 415 ° C. However, as described above, when the temperature exceeds 400 ° C., the coke remains in a red hot state, and there is a concern that the coke itself may burn in contact with air in the belt or the subsequent equipment. Therefore, it is extremely dangerous that the coke exceeding 400 ° C. when it is discharged from the coke-mounted box is directly transferred to the transport facility, and should not be implemented. Therefore, the heat resistance temperature of the transfer facility does not need to be higher than 250 ° C.
Moreover, since the temperature drop is particularly large in the initial 10 minutes of drying and air cooling in the wharf, the drying and air cooling treatment in the wharf requires 10 minutes.

  From the standpoint of making the coke temperature uniform after fire extinguishing, when sprinkling fired red coke in a coke-mounted box, the water spray distribution should be adjusted according to the layer height distribution and temperature distribution of the red hot coke. is there. However, as in Patent Document 4, it is difficult to measure the layer height distribution and the temperature distribution. In the present invention, it is assumed that these measurements are not performed.

(Red-hot coke sprinkling fire)
FIG. 4 is a cross-sectional view showing a deployed state of the moving device associated with the coke oven carbonization chamber. When extruding the red hot coke 3 into the coke mounting box 5, the furnace lids on both sides of the carbonization chamber 1 are removed, and an extruder equipped with a pusher ram 21 having a push plate adapted to the cross-sectional shape of the carbonization chamber 1 is installed on the other side. Is equipped with a coke-mounted box 5 to be pulled by a fire extinguishing freight car 4 that receives red-hot coke 3 and a guide car 2 for guiding red-hot coke to the coke-mounted box 5 (as viewed from the direction of travel of the coke-mounted box). It is a figure). With the start of extrusion, the coke-mounted box starts running so as to receive the red hot coke 3 in a wide range of the coke-mounted box 5.

  After the fire extinguishing of the red heat coke 3 is completed, the coke-carrying box 5 is moved from the fire extinguishing equipment 7 to the wharf, the discharge gate 16 of the coke-carrying box 5 is opened, and the coke 9 is moved to the wharf 8-1 and 8- Drain into either 2 or 8-3 and dry air cool. The dry air cooling treatment time in the wharf 8 is generally said to be about 30 to 40 minutes, but in the present invention, the dry air cooling treatment time is set to 20 minutes or less.

(Uniform temperature in the length direction of the box with fire extinguisher)
FIG. 6 is a view of the state where the fire extinguishing wagon 4 is drawn into the fire extinguishing equipment 7 as viewed from a vertical position (lateral direction) with respect to the traveling direction of the fire extinguishing freight car. In the initial extrusion, the amount of reddish coke 3 to be extruded is small, and in the final stage, the amount of reddish coke remaining in the carbonization chamber 1 is small. , The end A and the end B are low. The same applies to FIG. 8 described later. Moreover, since the red hot coke received by the edge part A and the edge part B exists in the both ends of a carbonization chamber, and it was dry-distilled, temperature becomes low compared with the red hot coke of a center part. Accordingly, the amount of water required at the end A and the end B is less than that at the center.

  A head tank 11 in which the fire extinguishing water 12 is stored, a sprinkling pipe 13 extending from the head tank 11, a valve 14 installed in the sprinkling pipe 13, and a valve 14-attached to the sprinkling pipe branched from the sprinkling pipe 13 4-14-6, and the watering nozzle 15 attached to the tip of the watering pipe further branched. The amount of water sprayed at the end A, the end B, and the center is adjusted by the valves 14-4 to 14-6. If the amount of water sprayed to each location is kept for a long time with the valves 14-4, 14-5 and 14-6 open, the amount of water sprayed to that location will increase. For example, water spraying to both ends with a small amount of red hot coke 3 may be performed by opening the valves 14-4 and 14-6 for a shorter time than the valve 14-5.

  In the present invention, the amount of fire extinguishing water sprayed to the end A and the end B is 0.4 to 0.8 in the center, so that the temperature of the coke discharged to the wharf is made uniform, Even if the temperature and the layer height distribution of the red hot coke in the coke-mounted box are not measured, a coke that has a moisture content of 5% by mass or less and is free from fear of belt burnout after the wharf can be obtained by a dry air cooling process within 20 minutes.

If the amount of fire extinguishing water sprayed to the end A and the end B is less than 0.4 in the center, only the center is excessively cooled or the end A and the end B are not sufficiently cooled. It becomes. When the amount of fire-extinguishing water sprayed to the end A and the end B exceeds 0.8 in the center, water spraying to the center is insufficient, or water spraying to the ends A and B is excessive. There is concern. For this reason, it becomes difficult to make the water | moisture content of the coke conveyed to a blast furnace into 5 mass% or less stably, and becomes a cause of destabilization of blast furnace operation. Alternatively, there is a high possibility that coke having a temperature higher than the heat resistance temperature of the transfer facility is discharged to the subsequent transfer facility.
The ratio of the length between the end portion and the center portion is such that the end portion A / center portion ratio is about 0.6 to 1.0, and the end B / center portion ratio is about 0.6 to 1.0.

(Temperature uniformity in the width direction of coke mounted box)
FIG. 5 shows a state in which the fire extinguishing freight car 4 is drawn into the fire extinguishing equipment 7 as seen from the traveling direction (front-rear direction) of the fire extinguishing freight car. The bottom plate 19 of the coke mounting box 5 provided in the fire fighting freight car 4 is inclined at a predetermined angle α in the width direction of the fire fighting freight car 4, and the red hot coke 3 is loaded thereon. A sprinkling pipe for extinguishing the red hot coke 3 is installed above the coke mounting box 5. The fire extinguishing equipment 7 includes a head tank 11 in which fire extinguishing water 12 is stored, a sprinkling pipe 13 extending from the head tank 11, a valve 14 installed in the sprinkling pipe 13, and a sprinkling pipe branched from the sprinkling pipe 13. The attached valves 14-1 to 14-3 and the watering nozzle 15 attached to the tip of the branched watering pipe are provided. The water sprinkling pipe is branched in the width direction of the coke mounting box 5, and the amount of water spraying to each place is controlled by opening and closing valves 14-1, 14-2 and 14-3.

  Usually, the watering nozzles 15 are arranged in a plurality in the width direction of the coke mounting box 5 and in a plurality of rows in the traveling direction of the coke mounting box 5. When the coke loading box 5 loaded with the red hot coke 3 is drawn into the fire extinguishing equipment 7, the valve 14 is opened, and the fire extinguishing water 12 in the head tank 11 passes through the water sprinkling pipe 13 from the water spray nozzle 15 and the red hot coke 3. Water is sprinkled on the top surface of.

  For example, when there is a lot of red hot coke in the upper part of the bottom plate 19 of the coke mounting box 5, only the valve 14-3 is closed early to stop watering, and the valves 14-1 and 14-2 remain "open". It is also possible. Thereby, while suppressing the excessive water sprinkling to the coke in the lower end or intermediate position of a bottom board, the coke in an upper part can be reliably extinguished until there is no remaining fire. In the fire extinguishing of the red hot coke 3 near the lower end of the bottom plate 19 of the coke mounting box 5, the fire extinguishing water 12 sprayed at a position higher than the place flows downward along the bottom plate of the coke mounting box 5, near the lower end It should also be considered to extinguish the red coke in It should be considered that overcooling is required unless the amount of watering is reduced compared to watering to a higher position.

  In the end portion A and the end portion B shown in FIG. 6, the water spray to the vicinity of the lower end of the inclined bottom plate 19 of the coke mounting box 5 should be less than the water spray to a higher position. In some cases, it is preferably not performed. This is because the fire extinguishing water 12 sprinkled on the upper part of the inclined bottom plate 19 shown in FIG. 5 flows downward along the bottom plate 19 of the coke mounting box 5 and submerses the red hot coke near the lower end. This is for extinguishing and cooling. Thus, it is cooled also by the fire extinguishing water 12 sprayed on the upper part. For this reason, if water is sprayed on the lower end portion of the bottom plate 19 of the coke mounting box 5 corresponding to the end portion A and the end portion B, there is a concern that this portion is excessively cooled and the coke moisture is increased.

Therefore, assuming that the overall length in the width direction of the coke mounting box is 1, water spraying in the width direction of the coke mounting box at the end portion A and the end portion B starts from the upper end of the inclined bottom plate of the coke mounting box. It is preferable to carry out only in the range of 0.0 or more and 0.8 or less.
Similarly, the red hot coke 3 in the vicinity of the lower end is cooled by the fire extinguishing water 12 that flows from the upper side to the lower side in the central portion. However, the amount of red hot coke is larger in the central portion than in the end portion A and the end portion B, and the coke temperature is high. Therefore, cooling is insufficient with only the fire-extinguishing water flowing down from above. Therefore, watering to the vicinity of the lower end is necessary in the central part.

(Adjustment of watering rate based on the temperature in the carbonization chamber)
In normal operation, the sprinkling flow rate is preferably constant. This is because the operation of changing the sprinkling flow rate becomes complicated. However, the carbonization time may be longer than usual due to troubles in the coke oven. At that time, the temperature of the red hot coke received in the coke mounting box changes. The amount of water spray should be changed accordingly.
Although it is desirable to actually measure the temperature of the red hot coke as described in Patent Document 4, it is not easy to measure the coke temperature distribution as described above. In the present invention, the measurement value by the temperature sensor 22 that is permanently installed at the tip of the pusher ram 21 shown in FIG. 4 and measures the temperature in the carbonization chamber can be used as data for optimizing the amount of sprinkling.

<Second Embodiment>
The second embodiment of the present invention is different in the number of steps of 2 or more and 4 or less immediately above or near the lower end of the inclined bottom plate of the coke mounting box toward the red hot coke received in the coke mounting box. It is the aspect which sprinkles fire-extinguishing water diagonally downward from the watering piping arrange | positioned at height.

Sprinkling of this embodiment is shown in FIGS.
FIG. 7 shows a state in which the fire extinguishing wagon 4 is drawn into the fire extinguishing equipment 7 as seen from the traveling direction (front-rear direction) of the fire extinguishing freight car.
FIG. 8 is a view from the vertical position with respect to the traveling direction (front-rear direction) of the fire fighting freight car.

  Water spraying to the red hot coke 3 is performed from a plurality of pipe-type water sprinkling pipes 17-1, 17-2 and 17-3 disposed obliquely above the coke mounting box 5 as shown in FIGS. As shown in FIG. 8, the watering pipes 17-1 to 17-3 are provided with a plurality of watering holes 18 in the traveling direction (front-rear direction) of the coke mounting box 5. Fire extinguishing water 12 is sprinkled toward.

  In the conventional fire extinguishing method, as shown in FIG. 4, a part of the guide car 2 is located on the coke mounting box 5 and covers the entire surface thereof, so that the guide car 2 passes through the fire extinguishing equipment 7. If it interferes with fire extinguishing room and sprinkling pipe. Therefore, the installation place of the fire extinguishing equipment 7 is limited to the end of the coke oven composed of a plurality of carbonization chambers. That is, as shown in FIG. 5, when watering from directly above, the watering piping including the watering nozzle 15 and the valves 14-1 to 14-3 hinder the traveling of the guide vehicle 2. Further, the side walls (three surfaces) of the fire extinguishing chamber hinder the traveling of the dust collecting hood of the guide wheel 2. For this reason, it was impossible to install a fire extinguishing facility in the center of the coke oven group.

  Therefore, when red-hot coke 3 is received from the carbonization chamber located at a location away from the fire extinguishing equipment 7, the travel distance and travel time to the fire extinguishing equipment 7 become longer, and the extrusion work, movement from the extrusion kiln to the fire extinguishing equipment The time required for a series of operations such as extinguishing red-hot coke and discharging fire-fighting coke to the wharf becomes longer, and the coke necessary for blast furnace operation cannot be supplied. There was also a problem that the surface of red hot coke during the transfer from the extrusion kiln to the fire extinguishing equipment burned and burned, and the coke yield was lowered. Moreover, since the traveling distance of the fire extinguishing wagon and the coke-carrying bucket becomes long, the fuel cost for traveling increases. Furthermore, coke ovens have many aging facilities, and when an abnormality occurs in the rail 6 on which the fire extinguishing wagon and the coke-mounted bucket run, the fire extinguishing wagon may not be able to run completely.

  On the other hand, if it is the watering from diagonally upward as FIG. 7 of this embodiment, compared with the watering from right above shown in FIG. 5, FIG. 6, the installation space of watering piping can be reduced. In the method shown in FIG. 7, when the fire or freight from the fire extinguishing wagon is severely scattered during the fire extinguishing, a hanging curtain is hung on the side wall of the fire extinguishing chamber during the fire extinguishing to prevent the steam or dust from being scattered outside. do it. Opening the side walls (3 sides) of the fire extinguishing chamber so that the dust collection hoods of the guide vehicle 2 can run against the fact that the side walls (3 sides) of the fire extinguishing chamber hinder the travel of the dust collection hood of the guide vehicle 2 In the case of extinguishing the fire, a structure that can prevent the scattering of steam and dust by the hanging curtain may be used. By installing the fire extinguishing equipment 7 in the vicinity of the middle part of the coke oven, the travel distance and travel time to the fire extinguishing equipment 7 can be shortened, and the reduction in coke yield can be prevented.

The sprinkling pipe 17 has an opening position of the sprinkling pipe of 0 to 1 m above the end on the lower end side of the bottom plate 19 of the coke mounting box 5 or just above the end on the lower end side of the bottom plate 19, the direction in which the carbonizing chamber 1 is located. Alternatively, it is arranged at a position shifted in the opposite direction. Thereby, even if the fire extinguishing equipment 7 is installed in the middle part of the coke oven, the traveling of the guide car is not interfered. The height distances h ₁ , h ₂ and h ₃ from the upper end of the coke mounting box 5 to the sprinkling pipes 17-1 to 17-3 are in the range of about ₃ to 7 m. By installing two or more sprinkling pipes, water can be sprinkled over a wide area in the coke mounting box width direction. However, if there are more than four stages, a large space is required. Also, if three stages are installed, water can be sprayed over a sufficiently wide range, so there is no merit of increasing the number of stages.

  However, in sprinkling from obliquely above, there is a problem that the temperature variation of coke after fire extinguishes becomes large. For this reason, when trying to reduce the moisture, coke was generated at a high temperature, and when trying to suppress equipment burnout after the wharf, coke with a high moisture content was obtained. This problem is solved by the means described below, and coke with a moisture content of 5% by mass or less is stably produced within 20 minutes with a dry air-cooling treatment time in the wharf without causing equipment burnout at the latter stage of the wharf. I was able to do it.

  In sprinkling from obliquely above, the watering pressure in the watering pipe 17 is 10 kPa or more and 40 kPa or less. By setting the watering pressure to 10 kPa or more, the fire extinguishing water 12 reaches the red hot coke at the upper part of the bottom plate of the coke mounting box 5 that is located farthest from the watering pipe 17, and fire extinguishing can be surely performed. Moreover, by sprinkling the fire-extinguishing water 12 vigorously, the deposited layer of the red-hot coke 3 is destroyed, and the fire-extinguishing water is easily supplied to the lower layer portion, so that the fire extinguishing becomes efficient. However, in order to increase the water spray pressure, it is necessary to increase the position of the head tank 11. It is not realistic to raise the watering pressure extremely, and if the fire water can be extinguished without any problem with watering pressure of 40 kPa or less, the position of the head tank 11 does not need to be higher than necessary.

  The pressure sensor for monitoring the sprinkling pressure may be permanently installed at the end of the sprinkling pipe as shown in FIG. If necessary, it may be installed at both ends. Thereby, watering conditions can be constantly monitored. When the watering pressure drops, clean the inside of the watering pipe so that the coke temperature after extinguishing is within the proper range. It is conceivable to install a flow meter as a means for monitoring the watering condition. However, it is not easy to measure the flow rate because a space for installing the flow meter is required. Therefore, it is preferable to install a pressure sensor.

In addition, by providing a height distance from the red hot coke after diagonally upward, even if fine coke is scattered due to the collision of the fire-extinguishing water, the holes of the sprinkling pipe are not blocked. Therefore, it is possible to increase the water spray flow density (the amount of water spray per 1 m ² ). By increasing the sprinkling flow density, the red hot coke deposited in the coke mounting box can be cooled uniformly in the depth direction. Furthermore, it is effective to increase the water spray flow density from the viewpoint of shortening the water spray cooling time. The sprinkling flow density is 0.5 t / min / m ² or more and 1.5 t / min / m ² or less. If it is larger than 1.5 t / min / m ² , the fine-grained coke will be scattered violently by the collision of the fire-extinguishing water. This worsens the surrounding environment, for example, more coke falls from the coke-mounted box.

  Further, in sprinkling from obliquely above, it is necessary to adjust the sprinkling amount in consideration of the layer height level of the red hot coke 3 in the coke mounting box 5 as in the case of sprinkling from directly above. As shown in FIG. 8, the coke mounting box 5 is divided into a plurality of sections (end A, center, and end B) with respect to the traveling direction, and the amount of water sprayed to the end A and end B is directed to the center. The amount of water sprayed is 0.4 or more and 0.8 or less. Further, at the end portion A and the end portion B, water spraying to the vicinity of the lower end of the inclined bottom plate of the coke mounting box should be less than water spraying to a higher position. The fact that it is preferable not to perform in some cases is the same even when watering from diagonally above. In order to do this, the sprinkling pipes at the center, end A and end B were connected via a loose flange so that the sprinkling angle could be adjusted at each part. By using a loose flange, it is possible to easily adjust or change the installation angle of the sprinkling pipe. Also, the installation angle can be adjusted precisely.

Hereinafter, test examples carried out according to the present invention will be described.
<Fire extinguishing coke temperature and coke moisture immediately after wharf delivery>
After the red hot coke was sprinkled and fired, the temperature of the coke discharged to the wharf was measured with an infrared thermoviewer. Continuous measurement was performed at a measurement interval of 1/10 second. Measurement continued even after the payment was completed. Immediately after the completion of dispensing, coke was collected from a plurality of locations in the wharf and its moisture content was measured. Further, after 10 minutes, 20 minutes and 30 minutes, coke was collected from the same place to measure moisture. Table 1 shows test conditions and measurement results.

(Test Example 1-1)
In Test Example 1-1, coke was collected from a place where the coke temperature immediately after the wharf was discharged was 54 ° C., and the moisture change was measured. The water content immediately after dispensing was 14.9% by mass. Thereafter, the drying and air cooling treatment was continued for 30 minutes, and coke was collected from the same place after 5 minutes, 10 minutes, 20 minutes and 30 minutes to measure moisture. However, as shown in Table 1 and FIG. 1, a decrease in moisture could not be confirmed during the dry air cooling process.

(Test Example 1-2)
In Test Example 1-2, coke was collected from a place where the coke temperature was 62 ° C. immediately after the wharf was discharged, and the moisture change was measured. The water content immediately after the discharge was 13.8% by mass. However, when the dry air cooling process was continued thereafter, the water content gradually decreased as shown in Table 1 and FIG. It decreased to mass%. That is, if the temperature immediately after the wharf is discharged is set to 62 ° C. or higher, it is possible to realize moisture reduction by wharf drying and air cooling.

(Test Example 1-3)
In Test Example 1-3, coke was sampled from a place where the coke temperature immediately after the wharf was discharged was 75 ° C., and the moisture change was measured. Moisture immediately after dispensing was 9.7% by mass, but decreased to 4.1% by mass after 10 minutes of dry air cooling and 3.3% by mass after 20 minutes as shown in Table 1 and FIG. .

(Test Example 1-4)
In Test Example 1-4, coke was collected from a place where the coke temperature immediately after the wharf was discharged was 120 ° C., and the moisture change was measured. Needless to say, the moisture content was as low as 2.7% by mass immediately after dispensing. As shown in Table 1, the moisture was further reduced by the dry air cooling treatment. However, it is very difficult to make all coke discharged to the wharf to be 120 ° C. or higher. When this temperature is kept high, the temperature of the entire coke increases and the maximum temperature also increases. In this case, there is a concern that the coke temperature is not sufficiently lowered during the wharf drying and air cooling, and the blast furnace conveying belt is burned out.

FIG. 1 shows the relationship between the drying air cooling time in the wharf and the coke moisture. The measured values obtained in Test Example 1-1 to Test Example 1-3 in Table 1 are illustrated. The temperature shown in the legend is a value (initial temperature) measured by an infrared thermo-viewer immediately after the red hot coke is extinguished by wet extinguishing and discharged to the wharf. There was no recuperation as described in Patent Document 3 during the drying and air-cooling treatment in the wharf.
From the results of Test Example 1-2 and Test Example 1-3, it was found that even when the temperature of the coke discharged to the wharf was less than 100 ° C., the water content was reduced by dry air cooling in the wharf. And if the temperature of the coke delivered to a wharf is 60 degreeC or more, it turned out that it falls to 5 mass% or less after 20 minutes of discharge to a wharf. The dry air cooling treatment is generally said to be 30 to 40 minutes, but if it can be shortened within 20 minutes, the wharf area required for the dry air cooling treatment can be greatly reduced.

  On the other hand, when the control value of the minimum temperature is increased, the coke temperature generally increases. The amount of reddish coke received in the coke-mounted box is extremely large, about 20 tons or more, and it is extremely difficult to extinguish the fire so that the temperature becomes uniform. Therefore, when the control value of the minimum temperature is increased, there is a concern that the temperature partially rises excessively, the temperature does not fall down during dry air cooling, and the subsequent blast furnace conveyor belt is burned out. Therefore, the control value of the minimum temperature is preferably 80 ° C. or less.

<Measurement test of temperature change by dry air cooling>
The coke temperature change due to the dry air cooling treatment of the coke discharged to the wharf was measured. Table 2 shows the measurement results. FIG. 2 shows the temperature change of the coke by the dry air cooling treatment of the coke measured in Table 2.

(Test Example 2-1)
Coke with a temperature of 338 ° C. at the time of discharge was cooled by a dry air cooling treatment, and decreased to 227 ° C. after 10 minutes and to 172 ° C. after 20 minutes. That is, a temperature drop of 111 ° C. for 10 minutes and 166 ° C. for 20 minutes was confirmed. From the viewpoint of suppressing burnout of the transport equipment to the subsequent blast furnace, it is essential to cool the coke to a temperature lower than the heat resistance temperature of the transport equipment to the blast furnace during the dry air cooling period in the wharf. From this test result, if the dry air cooling treatment time in the wharf is set to 20 minutes or less, the maximum temperature of the coke discharged to the wharf may be 165 ° C. or less in a range exceeding the heat resistance temperature of the transport facility. For example, when a conveyance facility having a heat resistant temperature of 180 ° C. is used, the maximum temperature of coke delivered to the wharf may be 345 ° C. or less. Moreover, if the maximum temperature of coke can be restrained to less than 291 degreeC, fire extinguishing coke can be cooled to less than the heat-resistant temperature of a conveyance equipment even if dry air cooling process time is 10 minutes.

<Coke fire extinguishing test according to second embodiment>
FIG. 7 is a view of the state where the fire extinguishing wagon 4 is drawn into the fire extinguishing equipment 7 in the second embodiment, as viewed from the traveling direction (front-rear direction) of the fire extinguishing freight car.
The width w of the coke mounting box 5 was 5 m, and the amount of reddish coke received per time was 25 tons. The height of the red hot coke layer mounted in the coke mounting box 5 was such that the red hot coke flowed into the lower end side of the bottom plate 19 with the dropping point as the apex. The inclination angle α of the bottom plate 19 of the coke mounting box 5 was 15 °. The sprinkling pipes 17 are arranged in three stages in the height direction so that the opening positions of the sprinkling pipes are directly above the end portion on the lower end side of the bottom plate 19 of the coke mounting box 5. The height h1 from the upper end of the coke mounting box 5 to the lower sprinkler pipe is 5 m, the height h2 to the middle sprinkler pipe is 5.7 m, and the height h3 to the upper sprinkler pipe is 6.4 m. It was. The watering pipes 17-1 to 17-3 have watering holes 18, and the watering angles α1 and α2 were adjusted so that water was sprayed in two directions from each watering pipe.

  The fire-extinguishing water 12 is sprinkled toward the red hot coke 3 by opening a valve 14 arranged in a sprinkling pipe 13 extending from the head tank 11 installed above the upper sprinkling pipe 17-1. Water spraying was terminated by closing the valve 14 when the given time had elapsed.

  FIG. 8 is a view of the state in which the coke mounting box 5 is drawn into the fire extinguishing equipment 7 as viewed from the direction perpendicular to the traveling direction of the fire extinguishing freight car 4. The layer height of the red hot coke mounted on both ends (end A and end B) of the coke mounting box 5 was lower than that in the center. The length of the sprinkling pipes 17-1 to 17-3 is the same as the length of the coke mounting box 5, and the fire extinguishing water 12 is sprayed over the entire range where the red hot coke 3 exists. The water sprinkling pipe 17 was equally divided into three sections of an end A, a center part, and an end B so that the water spray angle could be adjusted in each section. The sprinkling pipes 17 divided into three sections are connected via a loose flange 20 so that the watering angle in each section can be easily adjusted. A pressure gauge for measuring the pressure at the time of watering was installed at the ends of the watering pipes 17-1 to 17-3.

  After the fire extinguishing of the red hot coke 3 was completed, the coke mounting box 5 was moved to the wharf, the discharge gate 16 of the coke mounting box 5 was opened, and the extinguished coke was discharged to the wharf. At that time, the temperature of the coke discharged to the wharf was continuously measured by an infrared thermoviewer. The wharf was subjected to a dry air cooling treatment for 10 to 20 minutes, and then paid out to the transfer equipment to the blast furnace. Here, the time from the completion of the discharge of wet-fired coke to the wharf until the start of the discharge of the coke to the transport facility was taken as the dry air cooling treatment time. Immediately after being delivered to the transfer facility or from inside the wharf, coke was collected and its moisture content was measured. Moreover, the heat-resistant temperature of the conveyance facility was 180 ° C.

  The test results are shown in Table 3.

(Test Example 3-1)
In Test Example 3-1, the watering angles α1 and α2 were adjusted so that water was sprayed almost entirely in the width direction of the coke mounting box 5. As shown in FIG. 7, when the upper end of the inclined bottom plate 19 of the coke mounting box 5 is the starting point (zero) and the total length (w) of the length in the width direction of the coke mounting box is 1, the layer height of the red hot coke 3 is The highest position exists in the vicinity of 0.35, and the layer height is gradually lowered from that position toward the lower end of the bottom plate 19 of the coke mounting box 5. In consideration of such layer height distribution, the watering from the watering pipe 17-1 located in the upper stage is in the range of 0.0 to 0.2, and the watering from the watering pipe 17-2 located in the middle stage is 0. Sprinkling from the sprinkling pipe 17-3 located in the lower stage in the range of 2 to 0.6 was aimed at a range of 0.6 to 0.9, and the angle of the sprinkling pipe was adjusted. The pressure in the piping during sprinkling was 5.3 kPa at the upper stage, 11.0 kPa at the middle stage, and 17.5 kPa at the lower stage. From the pressure, the ratio of the amount of water sprayed from the upper, middle and lower stages is estimated to be 0.234: 0.337: 0.429, and it is considered that the amount of water sprayed from the lower water spray pipe is the largest.

FIG. 8 shows the watering holes of the watering pipe. The water spray holes 18 are arranged in a staggered pattern along the traveling direction of the coke mounting box 5. The installation intervals of the water spray holes 18 at the end A, the center, and the end B were made the same so that the water spray amount to the end A, the center, and the end B was uniform (1: 1). : 1). At this time, the watering flow rate (watering flow density) per 1 m ² of the coke mounting box was 0.6 t / min, and the watering time was 78 seconds. The total watering amount is 78 t. 0.78 t of fire extinguishing water was sprayed per 1 m ² .

FIG. 9 shows the respective coke temperatures immediately after the start of payout, during the payout middle period, and in the late payout period when paying out to the wharf from the coke-mounted box 5 (Test Example 3-1).
At the beginning of the discharge, the coke was sufficiently extinguished, and many cokes were overcooled to below 50 ° C. The coke paid out in the initial stage exists near the lower end of the bottom plate 19 of the coke mounting box 5. Although the amount of coke present in this portion is small, it is considered that the fire extinguishing water 12 was sprayed most than the measured spraying pressure. Therefore, the coke was cooled excessively.

  On the other hand, in the second half of the payout, the coke temperature was higher than that in the initial stage, and coke at a maximum of 476 ° C. was discharged from the end A. It is thought that the cause is that water spraying to the part where the bed height of red hot coke 3 is the highest was insufficient. As described above, there were places where the cooling was insufficient, so even after 20 minutes of dry air cooling treatment, some of the coke remained at a temperature higher than the heat resistance temperature of the transfer equipment to the blast furnace. For this reason, in the 20 minute dry air cooling treatment, it was not possible to pay out to the transfer equipment to the blast furnace. Further, after 20 minutes, coke was sampled from two locations in the wharf and the moisture content was measured. The moisture content was as high as 14.4% by mass and 13.0% by mass. The reason why the coke temperature in the latter half of the payout has increased is also considered that the watering pressure in the upper watering pipe 17-1 was low. The sprinkling range is aimed at the vicinity of the upper end of the bottom plate 19 of the coke mounting box 5, but it is also possible that the water spray pressure was low and the fire-extinguishing water 12 did not reach sufficiently. The water sprinkled from the upper water sprinkling pipe 17-1 can be sprinkled near the upper end of the bottom plate 19 by being put on the water sprinkled from the middle water sprinkling pipe 17-2. However, it may have been insufficient.

(Test Example 3-2)
In Test Example 3-1, watering to the upper end side of the bottom plate 19 of the coke mounting box 5 was insufficient, and watering to the lower end side of the bottom plate of the coke mounting box 5 was excessive. Therefore, in Test Example 3-2, the water spray angle of the lower water sprinkling pipe 17-3 and the middle water sprinkling pipe 17-2 is set to be higher than that of Test Example 3-1, and the coke discharged in the initial stage (coke near the lower end of the bottom plate) ) Was not excessively cooled, and water spraying to the vicinity of the portion where the layer height of the red hot coke 3 was highest was strengthened. From the sprinkling pipe 17-1 located in the upper stage to the range of 0 to 0.2, from the sprinkling pipe 17-2 located in the middle stage to the range of 0.2 to 0.4, the sprinkling pipe 17- located in the lower stage From 3, the angle of the watering pipe was adjusted to be in the range of 0.4 to 0.7. The piping internal pressure during watering was 5.3 kPa at the upper stage, 11.0 kPa at the middle stage, and 17.5 kPa at the lower stage. From the watering pressure, the ratio of the amount of watering from the upper, middle and lower stages is estimated to be 0.234, 0.337 and 0.429. The watering flow rate (watering flow density) per 1 m ^{2 of the} coke-mounted box was 0.6 t / min, and the watering time was 78 seconds. The total water spray amount was 78 t. 0.78 t of fire extinguishing water was sprayed per 1 m ² . The ratio of the amount of water sprayed to the end A, the center and the end B was 1: 1: 1.

FIG. 10 shows the respective coke temperatures immediately after the start of payout, during the payout middle period, and in the late payout period when paying out to the wharf from the coke mounting box 5 (Test Example 3-2).
In the initial stage, the temperature of the coke discharged from the center was high. The maximum temperature is 379 ° C, which is a problem for disaster prevention. Moreover, the temperature of the coke discharged from both ends (the end A and the end B) of the coke mounting box 5 is often less than 60 ° C. regardless of the initial, middle and late period of the discharge. It is thought to be a cause of increasing the coke moisture.

  In Test Example 3-2, watering was not performed in the range of 0.7 to 1.0 (near the lower end of the bottom plate of the coke mounting box). That is, water is not sprinkled on coke that is initially paid to the wharf. Nevertheless, excessively cooled coke was discharged from the end A and the end B at the initial discharge stage. This is because the fire-fighting water 12 sprinkled in the range of 0 to 0.7, which is near the upper and middle stages of the bottom plate 19, flows downward along the bottom plate of the coke mounting box 5, near the lower end (0.7 to 1 0.0) and the fire was cooled and fired by submerging the red hot coke. Similarly, it is conceivable that the red hot coke in the vicinity of the lower end (0.7 to 1.0) is cooled by the fire-extinguishing water 12 flowing from above the central portion. However, since the amount of red hot coke is larger than that of the end A and the end B, it is considered that the coke is not cooled sufficiently and the coke having a high temperature is discharged.

  Thus, also in Test Example 3-2, there were places where coke was excessively cooled and places where cooling was insufficient as in Test Example 3-1. Since there were places where cooling was insufficient, even after 20 minutes of dry air cooling treatment, some coke remained at a temperature higher than the heat resistance temperature of the transfer equipment to the blast furnace. For this reason, in the 20 minute dry air cooling treatment, it was not possible to pay out to the transfer equipment to the blast furnace. In the same manner as in Test Example 3-1, 20 minutes later, coke was collected from two locations in the wharf and the moisture content was measured, and both 8.7% by mass and 7.8% by mass were higher than 5% by mass. .

(Invention Example 3-1)
In Invention Example 3-1, the number of sprinkling holes at the end A and the end B is reduced. Along with this, the watering pressure became higher overall. Therefore, the direction of the water sprinkling pipe was set downward as a whole. Then, the following tests were conducted.
FIG. 11 shows the respective coke temperatures immediately after the start of paying, during the paying out period, and during the paying out period when paying out to the wharf from the coke mounting box 5 (Invention Example 3-1).
In Invention Example 3-1, in order to enhance the cooling of the coke discharged from the central part in the initial stage, in the lower watering pipe 17-3, only the watering hole located in the central part is the same as Test Example 3-2. Compared to the downward direction. That is, only the central part was sprayed near the lower end of the bottom plate 19 of the coke mounting box 5. On the other hand, the watering angles of the portions corresponding to the end A and the end B were the same as those in Test Example 3-2.

  As shown in FIG. 7, when the total length (w) of the length in the width direction of the coke mounting box 5 is 1 with the upper end of the inclined bottom plate 19 of the coke mounting box 5 as the starting point (zero), the falling position of the fire extinguishing water 12 The watering from the upper watering pipe 17-1 is in the range of 0.0 to 0.2, and the watering from the middle watering pipe 17-2 is 0.2 to 0.4 at the end A and the end B. And the central part aimed at a range of 0.2 to 0.5. In the lower sprinkling pipe 17-3, the sprinkling from the end A and the end B is in the range of 0.4 to 0.7, and the sprinkling from the center is aimed at the range of 0.5 to 0.8. .

Further, in Test Example 3-2, since the temperature of the coke discharged from the end A and the end B was low, the water spray hole 18 so that the water spray to the end A and the end B was less than that in the center. Reduced the number of The amount of water sprayed to the end A and the end B was set to be 3/5 times that of the center. By reducing the number of water spray holes at the end A and the end B, the water spray pressure was changed to Test Example 3-1 and Increased compared to 3-2. The pressure at the time of watering was 11.1 kPa in the upper stage, 17.9 kPa in the middle stage, and 25 kPa in the lower stage. From the watering pressure, the ratio of the amount of watering from the upper, middle and lower stages is estimated to be upper / middle / lower = 26/33/41. The watering flow rate (watering flow density) per 1 m ^{2 of the} coke-mounted box was 0.6 t / min, and the watering time was 78 seconds. The total water spray amount is 78 t. Accordingly, 0.78 t of fire extinguishing water was sprayed per 1 m ² .

  The coke temperature discharged to the wharf is as shown in Table 3 and FIG. FIG. 11 is a graph showing the temperature of the coke delivered to the wharf from the coke-mounted box 5 with respect to the traveling direction of the fire extinguishing freight car divided into immediately after the start of the delivery, in the middle of the delivery and in the latter half of the delivery. The temperature distribution with respect to the traveling direction of the fire fighting freight car was made uniform compared to Test Examples 3-1 and 3-2. The temperature of the discharged coke was a minimum temperature of 63 ° C., which was a temperature at which moisture could be reduced during dry air cooling in the wharf. On the other hand, the maximum temperature was 162 ° C., and the range exceeding the heat resistance temperature (180 ° C.) of the subsequent blast furnace conveyor was 165 ° C. or less. The average temperature was 97 ° C. The dried air-cooling treatment time was 10 minutes, and it was discharged to a blast furnace conveyor belt. Coke was collected and its water content was measured. As a result, the water content was as low as 4.9% by mass and 2.1% by mass. Although the minimum temperature of coke is 63 ° C, the average temperature is as high as 97 ° C, and the temperature may be uniform, and coke with a moisture content of 5% by mass or less can be obtained even after 10 minutes of dry air cooling. It is thought.

(Temperature distribution of coke discharged to the wharf)
12 to 14 show the temperature of coke discharged to the wharf and the cumulative ratio thereof in Test Examples 3-1, 3-2 and Invention Example 3-1. The proportion of coke at 60 ° C. or lower was 36% in Test Example 3-1, 9% in Test Example 3-2, and 0% in Invention Example 3-1. In Invention Example 3-1, the maximum temperature was 162 ° C., whereas in Test Example 3-1 and Test Example 3-2, there were many cokes at 300 ° C. or higher. For this reason, as shown in Table 3, in Test Example 3-2, the average temperature of coke discharged to the wharf was 107 ° C., which was higher than that of Invention Example 3-1. Nevertheless, the reason for the lowest coke moisture in Invention Example 3-1 is that the minimum temperature was higher than others. Since the minimum temperature was 63 ° C., it is considered from the results shown in FIG. 1 that all the coke discharged to the wharf evaporated water during the dry air cooling process. Further, if the temperature of the coke discharged to the wharf exceeds 100 ° C., it is considered that the moisture is extremely low at the time of discharge. Therefore, in the range exceeding 100 ° C., it seems that there is no significant difference in moisture even if the temperature is further increased. For example, coke at 150 ° C. is considered to have lower moisture than 120 ° C., but is considered to be sufficiently low even at 120 ° C., so it is considered that there is no significant difference from 150 ° C. The temperature below 100 ° C. should be lower than that. In particular, it is important to reduce the proportion of coke below 60 ° C. at which moisture reduction by dry air cooling treatment cannot be expected. Therefore, it is effective to set the minimum temperature to 60 ° C. or higher as in Invention Example 3-1.

  Inventive Example 3-1 is a result of water spraying from obliquely upward shown in FIGS. 7 and 8, and also in watering from right above shown in FIGS. Water spraying near the lower end of the bottom plate 19 of the mounting box 5 should be less than watering to a higher position. In some cases, it is not necessary. This is because the fire-extinguishing water 12 sprayed at the upper end flows downward along the bottom plate of the coke mounting box 5 as described above, and submerged the red hot coke near the lower end (0.8 to 1.0). Thinks to extinguish and cool. By not spraying water in the vicinity, it is possible to prevent the coke from being overcooled. Similarly, in the center portion, the red hot coke near the lower end is cooled by the fire extinguishing water 12 flowing down from the upper end to the lower surface. However, since the amount of red hot coke is larger than that of the end portion A and the end portion B and the coke temperature is high, it is not sufficiently cooled. Therefore, watering to the vicinity of the lower end is necessary in the central part. When water is not sprayed from the water sprinkling pipes corresponding to the end A and the end B toward the lower end of the coke mounting box bottom plate, the coke mounting box may be moved forward or backward by about 1 to 2 m in the water spray. Thus, the end of the coke mounting box may be moved to the vicinity of the central portion of the sprinkling pipe, and temporarily sprayed temporarily near the lower ends of the end A and the end B of the coke mounting box.

  In addition, the layer height of the red hot coke at the end A and the end B is lower than that at the center. The temperature of red hot coke is also low. Therefore, by setting the amount of water sprayed to the end A and the end B to be 0.4 or more and 0.8 or less in the center, the coke temperature after fire extinguishing is made uniform, and coke with low moisture is obtained.

In order to confirm the merit of setting the location of the fire extinguishing equipment in the center of the furnace group, the time required for the fire extinguishing freight car 4 to reciprocate the fire extinguishing equipment 7 to extinguish red coke was obtained by simulation. Coke was supplied to a blast furnace with a daily dredging amount of 10,000 t, and the amount of coke required per day in the blast furnace was 3,200 t. If the coke produced in one kiln is 20 t, the number of extrusions per day is 160 times.
Case 1 assumed that fire extinguishing equipment was installed at the end of the furnace group as shown in FIG. The closest No. The moving distance from one carbonization chamber to the fire extinguishing equipment was 20 m one way. Adjacent No. The distance from the carbonization chamber is 1.5 m. The distance traveled from the carbonization chamber to the fire extinguishing equipment was 21.5 m, the most distant No. 2 The distance between the 160 carbonization chamber and the fire extinguishing equipment is 258.5 m. The total distance traveled by the fire extinguishing freight car from the 160 carbonization chambers to the completion of the extrusion is 44.6 km (round trip). If the traveling speed of the fire extinguishing wagon and the coke-mounted box is 100 m / min (6 km / h), the total traveling time is 7.4 hours.
In case 2, as shown in FIG. 16, it was assumed that a fire extinguishing facility was installed in the center of the furnace group, that is, between the No. 80 carbonization chamber and the No. 81 carbonization chamber. The moving distance from the No. 80 carbonization chamber and No. 81 carbonization chamber closest to the fire extinguishing equipment to the fire extinguishing equipment was 20 m. The distance to the adjacent carbonization chamber is 1.5 m, and the distance to the No. 1 carbonization chamber or the 160 carbonization chamber located farthest from the fire extinguishing equipment is 138.5 m, respectively. The total travel distance of the fire-fighting wagon and the coke-carrying box is 25.4 km (round trip), which can be 19.2 km shorter than the case 1. When the traveling speed of the fire extinguishing wagon and the coke-mounted box is 100 m / min (6 km / h), the total traveling time per day is 4.2 hours, which can be shortened by 3.2 hours compared to Case 1.
The fire-fighting wagon 4 travels with the red hot coke being ½ of the travel time required to move from the carbonization chamber 1 to the fire-extinguishing equipment 7, which is a reduction of 1.6 hours. It is possible to reduce the amount of reddish coke that burns in contact with air by 43%.
Table 4 summarizes the comparison between Case 1 (FIG. 15) and Case 2 (FIG. 16).

In addition, the following can be cited as the merit of installing the fire extinguishing equipment in the center of the furnace group. In case 2, the travel distance of the fire extinguishing wagon and the coke mounting box can be shortened by 19.2 km per day as compared to case 1. As a result, the fuel cost of fire-fighting wagons can be reduced.
In addition, the coke oven has many old facilities, and abnormalities may occur in the rail 6 on which the fire extinguishing wagon and the coke-mounted bucket travel. For example, if there is an abnormality in FIG. 15A, in case 1, the fire extinguishing wagon and the coke-carrying box cannot travel at all. On the other hand, in case 2, even if there is an abnormality at the location B in FIG. 16, if the wharves 8-1 to 8-3 are arranged on both sides of the fire extinguishing equipment, no. It is possible to extrude from 1 to 80 kilns, extinguish red hot coke and pay it out to the wharf. In the meantime, it is also possible to deal with an abnormality that has occurred at location B. In such a case, Case 1 can be dealt with by installing fire extinguishing equipment at both ends, but it is not economical because two fire extinguishing equipment must be installed. Also, the area for installation must be considered.

  Also, assuming that the amount of coke required per day in the blast furnace is 3,200 t and the coke produced in one coking chamber is 20 t, the number of extrusions per day is 160 times. For that purpose, the average of one cycle (furnace lid removal and installation, grid installation, red-hot coke receiving, moving to fire extinguishing equipment, sprinkling fire extinguishing work, dispensing to wharf, moving to carbonization chamber) should be within 9 minutes It is necessary to reduce the travel time for the fire extinguishing wagon to reciprocate between the charcoal chamber and the fire extinguishing equipment as much as possible. In order to realize this, it is effective to increase the traveling speed of the fire fighting freight car, but it is more effective if the traveling distance can be simply shortened. In addition, when some trouble occurs, it may be impossible to extrude the red hot coke during that time. Even when extrusion is resumed after trouble recovery, it is desirable to shorten the cycle time. Even if the extrusion stops due to a problem, the carbonization proceeds in the carbonization chamber. Therefore, when the extrusion is resumed, dry distillation may be completed in many carbonization chambers. In that case, the cycle time in the extrusion operation affects coke productivity. In order to increase coke productivity, Case 2 that can shorten the cycle time is more advantageous than Case 1. In addition, if the carbonization time becomes longer than necessary, troubles are likely to occur due to this. Therefore, the extrusion after the carbonization time becomes long should be performed immediately, and Case 2 which can shorten the movement time of the fire fighting freight car is effective.

  In wet fire extinguishing of red hot coke, the coke temperature after wet fire extinguishing can be increased to lower the coke moisture, and the coke temperature can be controlled to the extent that it does not exceed the heat resistance temperature of the equipment. In addition, a fire extinguishing facility is installed in the center of the furnace group, and the time required for the red hot coke pushed out from the coke kiln to move to the fire extinguishing facility by the fire extinguishing freight car can be reliably supplied. In addition, it can be used to prevent a decrease in yield due to burning and burning of red hot coke while moving from the extrusion kiln to the fire extinguishing equipment.

1: Carbonization chamber 2: Guide car 3: Red hot coke 4: Fire extinguishing freight car 5: Coke mounting box 6: Rail 7: Fire extinguishing equipment 8; Wharf 9: Coke 10: Transport equipment 11: Head tank 12: Fire extinguishing water 13: Sprinkling piping 14: Valve 14-1: Valve 14-2: Valve 14-3: Valve 15: Watering nozzle 16: Discharge gate 17-1: Watering pipe (upper stage)
17-2: Watering pipe (middle stage)
17-3: Sprinkling pipe (lower)
18: Sprinkling hole 19: Bottom plate 20: Loose flange 21: Pusher ram

Claims (11)

After receiving the red hot coke pushed out from the carbonization chamber in a coke mounted box towed by a fire extinguisher freight car, the red hot coke is sprayed from the water sprinkling pipe in the fire extinguishing equipment to the red hot coke existing range in the coke mounted box. In the method of extinguishing coke,
After extinguishing completed, the minimum temperature of the coke to be paid out to the Wharf, and at 60 ° C. or higher, the maximum temperature, is 400 ° C., or any lower temperature of the temperature of the transport equipment heat resistance temperature + 165 ° C. of Wharf subsequent less A wet fire extinguishing method for red hot coke.   The method for wet extinguishing red hot coke according to claim 1, wherein the minimum temperature is 60 ° C. or higher and 80 ° C. or lower.   The wet heat extinguishing method for red hot coke according to claim 1, wherein the heat resistance temperature of the transport facility is 150 ° C. or higher and 250 ° C. or lower.   When the red-hot coke existing range in the coke-mounted box is divided into the extinguishing freight car traveling direction, the end A, the center, and the end B, the amount of water sprayed to the end A and the end B is reduced to the center. The wet-fire extinguishing method for red hot coke according to any one of claims 1 to 3, wherein the water spray amount is 0.4 or more and 0.8 or less. When the total length in the width direction of the coke mounting box is 1, and the red hot coke existing range in the coke mounting box is divided into three parts, an end A, a center, and an end B, in the fire extinguishing freight car traveling direction, the end A and claims watering in the width direction of the coke mounting box in the end B, starting from the upper end of the inclined bottom plate of the coke mounting box, and carrying out only in the range of 0.0 to 0.8 The wet-fire extinguishing method for red hot coke according to any one of claims 1 to 4.   When extruding red hot coke from the carbonization chamber to the coke loading box, a temperature sensor is permanently installed at the tip of the pusher ram equipped in the extrusion device, and the temperature of the carbonization chamber during extrusion is measured. The method for wet-extinguishing red hot coke according to any one of claims 1 to 5, wherein the sprinkling flow rate of coke is adjusted.   From the sprinkling pipes arranged at different heights of 2 to 4 steps, directly above or near the lower end of the inclined bottom plate of the coke loading box, toward the red hot coke received in the coke loading box The wet fire extinguishing method for red hot coke according to any one of claims 1 to 6, wherein fire extinguishing water is sprinkled obliquely downward. The wet-fire extinguishing method for red hot coke according to claim 7, wherein the water flow rate per 1 m ² at the time of watering treatment is 0.5 t / min or more and 1.5 t / min or less on average.   When the red hot coke existing range in the coke mounting box is divided into the extremity A, the center, and the end B in the extinguishing freight car traveling direction, the sprinkling pipes of the end A, the center, and the end B are The wet-fire extinguishing method for red hot coke according to claim 7, wherein the water spraying angle is set for each location. When the red hot coke existing range in the coke mounting box is divided into the extinguishing freight car traveling direction, the end A, the central part, and the end B, the watering angle of the watering pipe in the central part is the end A and The wet-fire extinguishing method for red hot coke according to any one of claims 7 to 9, wherein the wet fire extinguishing method is downward with respect to a watering angle of the end portion B.   The wet fire extinguishing method for red hot coke according to any one of claims 7 to 10, wherein an internal pressure of the watering pipe during watering treatment is 10 kPa or more and 40 kPa or less.

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