JP6753492B2 - Wet fire extinguishing equipment for red-hot coke - Google Patents

Description

The present invention relates to a wet fire extinguishing system for red-hot coke.

The method of extinguishing red hot coke that has been carbonized in a coke oven is roughly divided into wet extinguishing and dry extinguishing. In dry fire extinguishing, the red-hot coke that has been carbonized in the coke oven is temporarily placed in a coke-mounted box that is towed by the fire-extinguishing coke, the fire-extinguishing car is transferred to the dry-fire extinguishing equipment, and the red-hot coke is put into the dry-fire extinguishing equipment. It is done by doing. In the dry fire extinguishing, the red hot coke is extinguished by an inert gas such as nitrogen, and the coke can be made into a coke containing almost no water. However, due to the complicated equipment of dry fire extinguishing, wet fire extinguishing by sprinkling water on the red hot coke mounted in the coke mounting box is still performed.

(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. Due to variations in the packaging (layer height) of incandescent coke that is taken out of the coke oven and skeletonized on the coke loading box, spots that cannot be sufficiently extinguished occur in spots. If the red-hot coke is placed on the 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 also used.

(Drying air cooling processing time with wharf)
The wet-extinguished coke is discharged to a place called a wharf and subjected to a dry air-cooling treatment, and the dry air-cooling treatment time is generally said to be 30 to 40 minutes as described in Patent Document 1. There is. During drying and air cooling, the water contained in the coke evaporates due to the sensible heat of the coke itself. On the other hand, hot coke is air-cooled. If red hot coke remains, the fire is extinguished by sprinkling water on the wharf. For this reason, a drying air cooling treatment time of 30 to 40 minutes has been required. It is also conceivable to sprinkle water on the coke having a high temperature in the wharf to shorten the cooling time. However, in order to sprinkle water on the wharf, install or monitor a wharf sprinkler as in Patent Document 2. It is necessary to keep people on standby at all times.

(Temperature control and sprinkling control of coke 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 contradictory purposes, 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 fire extinguishing is important. Naturally, it is desirable that the minimum temperature be 100 ° C., which is the boiling point of water, or a temperature close to that. However, if the control value of the minimum temperature is increased, the temperature of the coke rises as a whole, and the temperature partially rises excessively, and there is a concern that the belt for transporting the blast furnace in the subsequent stage may be burnt. Therefore, the minimum temperature of coke delivered to the wharf should be controlled at the lowest possible temperature. From that point of view, it should be verified how low the minimum temperature can be.

In Patent Document 3, a model for obtaining the watering time and the watering flow rate for setting the water content of coke after fire extinguishing as a target value is constructed. In this model, the average particle size of the coke used in the operation is a single particle, and until the particle surface temperature drops below 100 ° C, where water can evaporate, evaporation occurs actively on the particle surface and into the particles. Although it does not absorb water, it is assumed that it begins to absorb water when the surface temperature falls below 100 ° C. and the water content becomes maximum at the end of watering. In addition, after the watering is completed, the heat is restored by the heat inside the coke particles, and the absorbed water is dissipated while gradually moving toward a temperature equilibrium state.

(Measurement of coke temperature and layer height after fire extinguishing)
In Patent Document 4, after the red-hot coke is sprinkled and cooled, the temperature distribution and / or layer height distribution of the post-fire coke mounted on the coke mounting box is measured immediately before being discharged to the wharf. After paying out to the wharf, the coke loading box is newly loaded with red hot coke and cooled by sprinkling water, but the sprinkling conditions at that time are the temperature distribution and / or the layer for which the payout to the wharf has already been completed. It is proposed to adjust based on the high distribution. It is also described that the temperature distribution and / or layer height distribution of the newly installed red-hot coke is measured inside the fire extinguishing tower as needed.

(About fire extinguishing equipment)
The fire extinguishing freight car loaded with red hot coke extruded from the carbonization chamber is moved to the fire extinguishing equipment and sprinkled and cooled, but the fire extinguishing equipment is installed only at the end of the coke oven. The reason for this is that the coke guide vehicle used to extrude the red hot coke from the carbonization chamber interferes with the fire extinguishing equipment, and if the fire extinguishing equipment is located in the center of the coke oven, it hinders the movement of the coke guide vehicle. When the fire extinguishing equipment is installed at the end of the coke oven, the travel time from the extinguishing kiln far away from the fire extinguishing equipment to the fire extinguishing equipment becomes longer, and the extruding work, the movement from the extruding kiln to the fire extinguishing equipment, the extinguishing of red hot coke, and the extinguishing of fire It takes a long time to perform a series of operations such as paying out coke to a wharf, which is inefficient. It can be difficult to produce the required coke in the blast furnace. In addition, the red-hot coke is burnt from the surface within the running time, which causes a decrease in the coke yield.

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

(Issues regarding moisture in coke after fire extinguishing and equipment burnout)
Excessive sprinkling of water to ensure that the red coke is extinguished causes the water content of the coke to rise after the fire is extinguished, causing deterioration of the heat source unit and the furnace condition in the blast furnace. It is desirable that the water content of the coke put into the blast furnace is 5% by mass or less. That is, it is also required to surely extinguish the red hot coke and not to increase the water content of the coke after extinguishing the fire.

(Issues about dry air cooling with wharf)
A large wharf area is required for drying and air cooling with a wharf. Depending on the factory, it may be difficult to provide a large area for the wharf. Therefore, it is desirable that the drying air cooling treatment time in the wharf is within 20 minutes. Further, it is conceivable to locally sprinkle water on the coke having a high temperature in the wharf to shorten the cooling time, but the installation of the wharf sprinkler device described in Patent Document 2 is costly. In addition, it is laborious to keep the observer on standby at all times.

(Issues regarding 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 shorten the drying air cooling treatment time in the blast furnace. In the present invention, the water content of coke supplied to the blast furnace is targeted to be 5% by mass or less within 20 minutes of drying and air-cooling treatment time in the blast furnace.
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 red-hot coke that is received in the coke-mounted box is extremely large, around 20 tons, and it is extremely difficult to make the temperature of coke uniform after the fire is extinguished. Assuming that the temperature becomes non-uniform, the control temperature range that can be realistically controlled should be determined.
In Patent Document 3, a model for obtaining the watering time and the watering flow rate for setting the water content of coke after fire extinguishing as a target value is constructed. However, the specific temperature for keeping the water content of the coke supplied to the blast furnace to 5% by mass or less within 20 minutes of the dry air cooling treatment time in the blast furnace is not described.

(Issues regarding measurement of coke temperature and layer height after fire extinguishing)
In Patent Document 4, after the red-hot coke is sprinkled and cooled, the temperature distribution and / or layer height distribution of the post-fire coke mounted on the coke mounting box is measured immediately before being discharged to the wharf. However, it takes time to measure the layer height distribution on the entire surface of the coke loading box and further reflect it in the sprinkling conditions, and one cycle of coke skeleton, sprinkling fire extinguishing and dispensing to the wharf is completed. It takes a long time to do it. As a result, coke productivity is reduced. In addition, the installation location of the measuring equipment must be taken into consideration. In this case, it is necessary to measure the entire body surface of the coke mounting box, and it is necessary to provide a distance between the body surface and the measuring device to some extent or more. When installing in an existing coke oven, it is a prerequisite that there is a space for installing measuring equipment above the coke mounting box. In addition, since there is a lot of dust around the coke mounting box and the temperature is high, it is necessary to consider the protection of the measuring equipment. For this reason, it is difficult to measure the layer height distribution and temperature distribution of coke in the coke loading box, and even without these measurements, the red-hot coke can be reliably extinguished and dry air-cooled with a 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 about fire extinguishing equipment)
In a conventional coke oven, the location of fire extinguishing equipment is limited to the edge of the coke oven to avoid interference with the coke guide vehicle. The fire extinguishing equipment interferes with the coke guide vehicle because the dust collecting hood of the coke guide vehicle interferes with the side walls (three surfaces) of the fire extinguishing chamber and the sprinkler pipe. 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 extruded from the coke kiln to be moved to the fire extinguishing equipment by the fire extinguishing freight car can be shortened. By shortening the travel time, the time required for a series of operations such as extrusion work, movement from the extrusion kiln to the fire extinguishing equipment, extinguishing red hot coke, and dispensing of fire extinguishing coke to the wharf can be significantly reduced, and the required coke in the blast furnace can be reduced. Can be produced.

In addition, since the mileage of the fire extinguishing freight car and the coke-mounted bucket is shortened, the fuel cost for running the fire extinguishing freight car can be reduced.
In addition, many coke ovens are aging equipment, and abnormalities may occur in the rails on which fire wagons and coke-mounted buckets run. Even in such a case, if there is a fire extinguishing freight car on the side of the carbonization chamber opposite to the rail where the abnormality occurred, the extinguishing from the carbonization chamber and the running of the fire extinguishing freight car can be continued.

In addition, moving from a carbonization chamber far away from the fire extinguishing equipment will increase the travel time from the extrusion kiln to the fire extinguishing equipment, and the red coke will burn out from the surface within the travel time, causing a decrease in coke yield. By shortening the travel time, it is possible to reduce burning and burning from the surface of incandescent coke.

The object of the present invention is to install the fire extinguishing equipment in the center of the furnace group and shorten the time required to move the fire extinguishing freight car from the extinguishing kiln to the fire extinguishing equipment, thereby reliably producing coke necessary for blast furnace operation and from the extruding kiln. This is to prevent a decrease in yield due to combustion and burning of incandescent coke while moving to a fire extinguishing facility.
An object of the present invention is to provide a wet fire extinguishing system for red coke that prevents a decrease in yield due to combustion burning of red coke during movement from an extrusion kiln to a fire extinguishing system.

The gist of the present invention is as follows.
(1) After the red hot coke extruded from the carbonization chamber is sunk into the coke-mounted box towed by the fire extinguishing freight car, water is sprinkled from the watering pipe in the fire extinguishing facility to the red hot coke existing range in the coke mounting box. Wet fire extinguishing equipment for incandescent coke, the fire extinguishing equipment is located at the center of the coke oven, and the sprinkler pipe in the fire extinguishing chamber is directly above or near the lower end of the inclined bottom plate of the coke mounting box. Wet fire extinguishing equipment for red-hot coke, which is characterized by being arranged at different heights of 2 or more and 4 or less.
(2) When the red hot coke existence range in the coke mounting box is divided into three parts, an end portion A, a central portion, and an end portion B in the direction of travel of the fire extinguishing freight car, the end portion A, the central portion, and the end portion B The wet fire extinguishing facility for red hot coke according to (1), wherein the sprinkler pipes are connected via a loose flange, and the sprinkling angle of the sprinkler pipes is set for each place.
(3) When the red hot coke existence range in the coke mounting box is divided into three parts, an end portion A, a central portion, and an end portion B in the traveling direction of the fire extinguishing freight car, the sprinkling angle of the sprinkling pipe in the central portion is the end. The wet coke wet fire extinguishing apparatus according to (1) or (2), wherein the portion A and the end portion B are directed downward with respect to the watering angle.
(4) The incandescent coke wet fire extinguishing system according to any one of (1) to (3), wherein the pressure inside the watering pipe during the watering treatment is 10 kPa or more and 40 kPa or less.
(5) Described in any one of (1) to (4), wherein the sprinkling flow rate per 1 m ² at the time of sprinkling treatment is 0.5 t / min or more and 1.5 t / min or less on average. Wet fire extinguishing equipment for red-hot coke.
(6) When the range of red hot coke in the coke mounting box is divided into three parts, an end A, a central part, and an end B in the direction of travel of the fire extinguishing freight car, the amount of water sprinkled on the end A and the end B is calculated. The wet fire extinguishing system for red-hot coke according to any one of (1) to (5), wherein the amount of water sprinkled on the central portion is 0.4 or more and 0.8 or less.
(7) When the existing range of incandescent coke in the coke mounting box is divided into three parts in the direction of travel of the fire extinguishing freight car, end A, center, and end B, and the total length in the width direction of the coke mounting box is 1, the above. Sprinkling water at the end A and the end B in the width direction of the coke mounting box is performed only in the range of 0.0 or more and 0.8 or less, starting from the upper end of the inclined bottom plate of the coke mounting box. The wet fire extinguishing equipment for red-hot coke according to any one of (1) to (6).
(8) When extruding the red hot coke from the carbonization chamber into the coke mounting box, a temperature sensor is permanently installed at the tip of a pusher ram equipped in the extrusion device to measure the temperature in the carbonization chamber at the time of extrusion, and the carbonization chamber is measured. The wet fire extinguishing apparatus for red hot coke according to any one of (1) to (7), wherein the water flow rate of the red hot coke is adjusted based on the temperature.
(9) The red hot coke wet fire extinguishing system according to any one of (1) to (8), characterized in that fire extinguishing water is sprinkled diagonally downward from the sprinkling pipe.
Here, "the fire extinguishing equipment is located at the center position of the coke oven group" means that a plurality of combustion chambers and carbonization chambers are alternately arranged and share the same mobile device at the center position of the coke oven group. It means to install fire extinguishing equipment in.

The fire extinguishing equipment can be installed in the center of the hearth, and the travel distance and travel time of the fire extinguishing freight car from the extrusion kiln to the fire extinguishing equipment can be significantly shortened. As the travel time is shortened, the time required for a series of operations such as extrusion work, movement from the extrusion kiln to the fire extinguishing equipment, extinguishing red hot coke, and dispensing of fire extinguishing coke to the wharf can be significantly reduced, and the coke required for blast furnace operation can be significantly reduced. Can be supplied. It is also possible to prevent a decrease in yield due to combustion burning of red hot coke while moving from the extrusion kiln to the fire extinguishing equipment. In addition, since the mileage of the fire extinguishing freight car and the coke-mounted bucket is shortened, the fuel cost of the fire extinguishing freight car can be reduced.

Further, many coke ovens have deteriorated equipment, and an abnormality may occur in the rail t on which the fire extinguishing freight car and the coke-mounted bucket run. Even in such a case, if the fire extinguishing equipment is installed in the center of the furnace group, if there is a fire extinguishing freight car on the side of the carbonization chamber opposite to the rail where the abnormality occurred, pushing out from the carbonization chamber or running the fire extinguishing freight car will not be possible. It is possible to continue.

The figure which shows the relationship between the dry air cooling treatment time in a wharf, and coke moisture. The figure which shows the temperature change of coke by the dry air cooling process of coke. A diagram showing the equipment configuration from extruding red coke from one of multiple carbonization chambers to transporting it to the blast furnace. The figure which shows the cross section of the deployment state of the moving device associated with a coke oven carbonization chamber. The figure which looked at the state which the fire extinguishing freight car 4 was pulled into the fire extinguishing equipment 7 from the traveling direction (front-back direction) of the fire extinguishing freight car. The figure which looked at the state which the fire extinguishing freight car 4 was pulled into the fire extinguishing equipment 7 from the position (horizontal direction) perpendicular to the traveling direction of the fire extinguishing freight car. In the second embodiment, the state in which the fire extinguishing freight car 4 is pulled into the fire extinguishing equipment 7 is viewed from the traveling direction (front-back direction) of the fire extinguishing freight car. The figure which shows the sprinkling hole of the sprinkling pipe in the 2nd Embodiment. It is a figure (test example 3-1) which shows the temperature of each of the coke immediately after the start of the payout, the middle stage of the payout, and the late payout when paying out from the coke loading box 5 to the wharf. It is a figure (test example 3-2) which shows the temperature of each of the coke immediately after the start of the payout, the middle stage of the payout, and the late payout when paying out from the coke loading box 5 to the wharf. FIG. 6 is a diagram showing the temperatures of coke immediately after the start of payout, in the middle stage of payout, and in the late stage of payout when the coke is paid out from the coke loading box 5 to the wharf (Invention Example 3-1). The figure which shows the temperature distribution of the coke discharged to a wharf (test example 3-1). The figure which shows the temperature distribution of the coke discharged to a wharf (test example 3-2). The figure which shows the temperature distribution of the coke discharged to a wharf (Invention Example 3-1). The figure which installed the fire extinguishing equipment at the end of the hearth. The figure which installed the fire extinguishing equipment in the central part of the furnace group.

Hereinafter, embodiments of the present invention will be described in detail.
<First embodiment>
The first embodiment of the present invention is to reduce the water content of coke and coke by controlling the minimum temperature and the maximum temperature of coke after sprinkling in a wet fire extinguishing of red hot coke and improving the watering method. This is an embodiment for maintaining the transport equipment.

FIG. 3 shows the equipment configuration from extruding red coke from one of a plurality of carbonization chambers to transporting it to a blast furnace. The incandescent coke 3 extruded from the carbonization chamber 1 is sunk in the coke loading box 5 towed by the fire extinguishing freight car 4. The coke-mounted box 5 on which the incandescent coke 3 is mounted travels on the rail 6 and moves to the fire extinguishing equipment 7, and is wet-extinguished by watering. After the extinguishing of the incandescent coke 3 is completed, the fire extinguishing freight car 4 is moved from the fire extinguishing equipment 7 to the wagon, the payout gate of the coke loading box 5 is opened, and the wet extinguished coke is put into the wharf 8-1, 8-2 and 8- Pay out to any of 3. After being dispensed to Wharf 8, the water contained in the coke is evaporated by a dry air cooling treatment. The coke is air-cooled to a temperature that does not burn the transport equipment 10 (belt conveyor). The dry air-cooling treatment with Wharf 8 is generally said to be about 30 to 40 minutes, but in the present invention, the dry air-cooling treatment is within 20 minutes. Then, after the wet fire extinguishing, the water content of the coke 9 supplied to the blast furnace is set to 5% by mass or less, and the temperature is set so that the transport equipment 10 to the blast furnace is not burnt.

The dry air cooling treatment time referred to here is defined as the time from when the coke is discharged from the coke loading box 5 to the wharf 8 and the coke starts to be discharged from the wharf to the transfer facility 10 to the blast furnace in the next process.

(Temperature control of coke after fire extinguishing)
In the wet fire extinguishing of the red-hot coke of the present invention, the minimum temperature of the coke discharged to the wharf after the fire is extinguished is 60 ° C. or higher, and the maximum temperature exceeds 400 ° C. or 165 ° C. Control the temperature below the lower of the temperatures. By setting the minimum temperature to 60 ° C. or higher, coke having a water content of 5% by mass or less can be produced even if the drying air cooling treatment time in the wharf is 20 minutes or less.

As will be described later, in the wharf, the coke has dropped by 166 ° C. after 20 minutes, and if the range exceeding the heat resistant temperature of the transport equipment is controlled to 165 ° C. or lower, the heat resistant temperature of the transport equipment will not be exceeded. However, even if the temperature exceeding the heat resistant temperature of the transport equipment is 165 ° C or lower, it must be 400 ° C or lower. When the temperature at which it is dispensed to the wharf exceeds 400 ° C., the coke is dispensed in a red-hot state. Coke that remains red hot tends to burn due to contact with air. Therefore, even if the coke temperature drops in the wharf, there is a concern that it will burn in the equipment at the subsequent stage and cause a disaster. That is, the maximum temperature of coke discharged to the wharf should be in the range of 400 ° C. or lower, preferably 350 ° C. or lower, regardless of the heat resistant temperature of the belt. Therefore, the maximum temperature of the coke discharged to the wharf after the fire is extinguished is controlled to be 400 ° C. or a temperature exceeding 165 ° C., which is lower than the heat resistant temperature of the transport equipment in the subsequent stage of the wharf, whichever is lower.

Further, even if the maximum temperature is the belt heat resistant temperature of the belt conveyor plus 165 ° C. or lower or 400 ° C. or lower, there is a concern that the temperature will not drop sufficiently if the ratio of the temperature close to the maximum temperature is high. Therefore, it should be considered as a precondition that 90% or more of the whole is the belt heat resistant temperature of the belt conveyor plus 100 ° C. or less.
The temperature of coke after wet fire extinguishing here is the temperature of coke discharged to the wharf after wet fire extinguishing. The temperature measurement of coke delivered to the wharf has a better measurement environment and can be easily performed than the temperature measurement inside the coke mounting box. In addition, if the temperature is measured with an infrared thermo-viewer that can continuously measure the temperature, the temperature of the coke discharged over the entire surface of the wharf can be continuously measured, and the temperature of the coke that has been wet-extinguished is compared with the temperature measurement inside the coke-mounted box. Can be known accurately.

The minimum temperature of the coke after extinguishing the fire to be discharged to the wharf is preferably controlled in the range of 60 ° C. or higher and 80 ° C. or lower. The minimum temperature is preferably 100 ° C., which is the boiling point of water, or higher. However, if the control value of the minimum temperature is increased, the temperature of the coke rises as a whole, and the temperature partially rises excessively, and there is a concern that the belt for transporting the blast furnace in the subsequent stage may be burnt. If the minimum temperature of the coke after extinguishing the fire is set to 80 ° C. or lower, it is possible to avoid an accident in which the belt for transporting the blast furnace in the subsequent stage is burnt.

The heat resistant temperature of the transport equipment to the blast furnace shall be 150 ° C or higher and 250 ° C or lower.
The maximum temperature of coke should be low from the viewpoint of ensuring fire extinguishing, but the minimum temperature should be as high as possible from the viewpoint of reducing water content. However, the amount of red-hot coke that is received in the coke-mounted box is extremely large, about 20 tons, and it is extremely difficult to make the temperature of coke uniform after extinguishing the fire. It should be considered on the assumption that the temperature will be non-uniform. Therefore, the coke delivered to the transport facility includes a large amount of coke exceeding 100 ° C. Therefore, the heat resistant temperature of the transport equipment to the blast furnace needs to be 150 ° C. or higher. As a result, even if coke exceeding 100 ° C. is discharged to the belt, burning can be suppressed. However, it does not have to be higher than 250 ° C. If the heat-resistant temperature is 250 ° C, the temperature of coke discharged from the coke loading box to the wharf can be up to 415 ° C. However, as described above, when the temperature exceeds 400 ° C., the coke remains red hot, and there is a concern that the coke itself burns in contact with air in the belt or the equipment in the subsequent stage. Therefore, it is extremely dangerous to discharge coke having a temperature exceeding 400 ° C. to the transport facility as it is when it is discharged from the coke loading box, and should not be carried out. Therefore, the heat resistant temperature of the transport equipment does not need to be higher than 250 ° C.
Further, since the temperature drop is particularly large in the initial 10 minutes of drying and air cooling with a wharf, 10 minutes is required for the drying and air cooling treatment with a wharf.

From the viewpoint of equalizing the temperature of coke after extinguishing the fire, when sprinkling and extinguishing the red-hot coke mounted on the coke-mounted box, the distribution of the amount of sprinkled water should be adjusted according to the layer height distribution and temperature distribution of the red-hot coke. is there. However, it is difficult to measure the layer height distribution and the temperature distribution as in Patent Document 4. In the present invention, it is premised that these measurements are not performed.

(Sprinkling fire extinguishing of red-hot coke)
FIG. 4 is a cross-sectional view showing the deployment state of the moving device related to the coke oven carbonization chamber. When extruding the incandescent coke 3 into the coke mounting box 5, the furnace lids on both sides of the coke chamber 1 are removed, and one is equipped with a pusher ram 21 having a push plate matching the cross-sectional shape of the coke chamber 1, and the other. Is equipped with a coke-mounted box 5 towed by a fire-extinguishing freight car 4 that receives the red-hot coke 3 and a guide vehicle 2 for guiding the red-hot coke to the coke-mounted box 5 (viewed from the direction of travel of the coke-mounted box). It is a figure). At the same time as the extrusion starts, the coke-mounted box starts running so as to receive the incandescent coke 3 over a wide range of the coke-mounted box 5.

After the fire extinguishing of the incandescent coke 3 is completed, the coke-mounted box 5 is moved from the fire extinguishing equipment 7 to the wharf, the payout gate 16 of the coke-mounted box 5 is opened, and the coke 9 is shown in FIG. Discharge to either 2 or 8-3 and dry and air cool. The drying air-cooling treatment time of Wharf 8 is generally said to be about 30 to 40 minutes, but in the present invention, the drying air-cooling treatment time is set to 20 minutes or less.

(Temperature equalization in the length direction of the fire engine mounting box)
FIG. 6 is a view of a state in which the fire extinguishing freight car 4 is pulled into the fire extinguishing equipment 7 from a position (horizontal direction) perpendicular to the traveling direction of the fire extinguishing freight car. The coke sunk in the coke loading box 5 is high in the central part because the amount of coke 3 extruded in the initial extrusion is small and the amount of coke remaining in the carbonization chamber 1 is small in the final stage. , End A and end B are lower. The same applies to FIG. 8 described later. Further, since the red-hot coke received at the end A and the end B exists at both ends of the carbonization chamber and is carbonized, the temperature is lower than that of the central red-hot coke. Therefore, the amount of water required at the end A and the end B is smaller than that at the center.

The head tank 11 in which the fire extinguishing water 12 is stored, the watering pipe 13 extending from the head tank 11, the valve 14 installed in the watering pipe 13, and the valve 14-attached to the watering pipe branched from the watering pipe 13. It is provided with 4 to 14-6 and a watering nozzle 15 attached to the tip of a further branched watering pipe. Valves 14-4 to 14-6 adjust the amount of water sprinkled on the end A, end B and center. If the amount of water sprinkled on each place is left in the "open" state of valves 14-4, 14-5 and 14-6 for a long time, the amount of water sprinkled on that place increases. For example, sprinkling water on both ends with a small amount of red coke 3 may make valves 14-4 and 14-6 open for less time than valves 14-5.

In the present invention, the amount of fire extinguishing water sprinkled on the end A and the end B is 0.4 or more and 0.8 or less in the central portion so that the temperature of the coke discharged to the wharf is made uniform. Even if the temperature and layer height distribution of the red hot coke in the coke loading box are not measured, coke with a moisture content of 5% by mass or less and no concern about belt burning in the subsequent stage of the wharf can be obtained by drying and air cooling treatment within 20 minutes.

When the amount of fire extinguishing water sprinkled on the end A and the end B is less than 0.4 in the central portion, only the central portion is excessively cooled or the end A and the end B are insufficiently cooled. It becomes. When the amount of fire extinguishing water sprinkled on the end A and the end B exceeds 0.8 in the central portion, the sprinkling on the central portion is insufficient or the sprinkling on the end A and the end B becomes excessive. Is a concern. For this reason, it becomes difficult to stably reduce the water content of coke transported to the blast furnace to 5% by mass or less, which causes destabilization of blast furnace operation. Alternatively, there is a high possibility that coke having a temperature higher than the heat resistant temperature of the transport equipment will be discharged to the transport equipment in the subsequent stage.
The ratio of the lengths of the end portion and the center portion is such that the end portion A / center portion ratio is 0.6 to 1.0 and the end portion B / center portion ratio is about 0.6 to 1.0.

(Temperature equalization in the width direction of the coke mounting box)
FIG. 5 is a view of the state in which the fire extinguishing freight car 4 is pulled into the fire extinguishing equipment 7 from the traveling direction (front-back direction) of the fire extinguishing freight car. The bottom plate 19 of the coke-mounted box 5 provided in the fire-extinguishing freight car 4 is inclined at a predetermined angle α in the width direction of the fire-extinguishing freight car 4, and the red-hot coke 3 is loaded on the bottom plate 19. A sprinkling pipe for extinguishing the red 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 watering pipe 13 extending from the head tank 11, a valve 14 installed in the watering pipe 13, and a watering pipe branched from the watering pipe 13. It includes attached valves 14-1 to 14-3 and a watering nozzle 15 attached to the tip of a further branched watering pipe. The sprinkling pipe is branched in the width direction of the coke mounting box 5, and the amount of sprinkling to each location is controlled by opening and closing valves 14-1, 14-2 and 14-3.

Usually, a plurality of watering nozzles 15 are arranged in a plurality of rows in the width direction of the coke mounting box 5 and a plurality of rows in the traveling direction of the coke mounting box 5. When the coke-mounted box 5 equipped with the red-hot coke 3 is pulled into the fire-extinguishing equipment 7, the valve 14 opens, and the fire-extinguishing water 12 in the head tank 11 passes through the watering pipe 13 from the watering nozzle 15 to the red-hot coke 3. Water is sprinkled on the upper surface of the.

For example, when a large amount of red coke is present on 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 are left "open". It is also possible. As a result, excessive watering to the coke at the lower end or the intermediate position of the bottom plate can be suppressed, and the coke at the upper part can be surely extinguished until there is no residual fire. To extinguish 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 sprinkled at a position higher than that location flows downward along the bottom plate of the coke mounting box 5 and is near the lower end. It should also be considered to submerge the red coke in the area to extinguish the fire. It should also be considered that overcooling will occur if the amount of water sprinkled is not reduced compared to watering higher than this location.

At the end A and the end B shown in FIG. 6, watering near the lower end of the inclined bottom plate 19 of the coke mounting box 5 should be less than watering at a higher position. In some cases, it is preferable not to do so. This is because the fire extinguishing water 12 sprinkled on the upper portion of the inclined bottom plate 19 shown in FIG. 5 flows downward along the bottom plate 19 of the coke mounting box 5 and submerges the red hot coke near the lower end. This is to extinguish and cool the fire. In this way, it is also cooled by the fire extinguishing water 12 sprinkled on the upper portion. Therefore, if water is sprinkled on the lower end of the bottom plate 19 of the coke mounting box 5 corresponding to the end A and the end B, there is a concern that this portion will be excessively cooled and the coke moisture will increase.

Therefore, assuming that the total length of the coke-mounted box in the width direction is 1, watering at the end A and the end B in the width direction of the coke-mounted box is 0 starting from the upper end of the inclined bottom plate of the coke-mounted box. It is preferable to carry out only in the range of .0 or more and 0.8 or less.
Similarly, in the central portion, the red hot coke 3 near the lower end is cooled by the fire extinguishing water 12 flowing from the upper side to the lower surface. However, since the amount of red-hot coke is larger in the central portion than in the end portions A and B and the coke temperature is high, cooling is insufficient only with the fire extinguishing water flowing down from above. Therefore, it is necessary to sprinkle water near the lower end in the central part.

(Adjustment of watering amount based on carbonization chamber temperature)
In normal operation, it is preferable that the watering flow rate is 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 that is sunk in the coke loading box changes. The amount of water sprinkled should be changed accordingly.
It is desirable to actually measure the temperature of red-hot coke as described in Patent Document 4, but it is not easy to measure the coke temperature distribution as described above. In the present invention, the value measured by the temperature sensor 22 which 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 water sprinkled.

<Second embodiment>
A second embodiment of the present invention differs from two or more steps to four steps or less directly above or near the lower end of the inclined bottom plate of the coke mounting box toward the red hot coke skeleton in the coke mounting box. This is a mode in which fire extinguishing water is sprinkled diagonally downward from a sprinkler pipe arranged at a height.

Watering of this embodiment is shown in FIGS. 7 and 8.
FIG. 7 is a view of the state in which the fire extinguishing freight car 4 is pulled into the fire extinguishing equipment 7 from the traveling direction (front-back direction) of the fire extinguishing freight car.
FIG. 8 is a view from a position perpendicular to the traveling direction (front-back direction) of the fire-extinguishing freight car.

Watering the incandescent coke 3 is performed from a plurality of pipe-type watering pipes 17-1, 17-2 and 17-3 arranged diagonally above the coke mounting box 5 as shown in FIGS. 7 and 8. As shown in FIG. 8, the sprinkler pipes 17-1 to 17-3 are provided with a plurality of sprinkler holes 18 in the traveling direction (front-back direction) of the coke mounting box 5, and the red hot coke 3 diagonally downward is provided. Fire extinguishing water 12 is sprinkled toward.

In the conventional fire extinguishing method, as shown in FIG. 4, a part of the guide vehicle 2 is located on the coke mounting box 5 and covers the entire surface thereof, so that the guide vehicle 2 passes through the fire extinguishing equipment 7. If it interferes with the fire extinguishing room and sprinkler piping. Therefore, the installation location of the fire extinguishing equipment 7 was limited to the end of the coke oven composed of a plurality of carbonization chambers. That is, as shown in FIG. 5, when water is sprinkled from directly above, the watering pipe 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 vehicle 2. For this reason, it was impossible to install fire extinguishing equipment in the center of the coke oven.

Therefore, when the incandescent coke 3 is corpse from the carbonization chamber located away from the fire extinguishing equipment 7, the mileage and traveling time to the fire extinguishing equipment 7 become long, and the extruding work and the movement from the extruding kiln to the fire extinguishing equipment are performed. , It takes a long time to perform a series of operations such as extinguishing red hot coke and paying out fire extinguishing coke to the wharf, and the coke required for blast furnace operation cannot be supplied. There was also a problem that the surface of the incandescent coke moving from the extrusion kiln to the fire extinguishing equipment was burned and burned, and the coke yield decreased. In addition, since the mileage of the fire extinguishing freight car and the coke-mounted bucket becomes long, the fuel cost for running becomes high. Further, many coke ovens have deteriorated equipment, and if an abnormality occurs in the rail 6 on which the fire extinguishing freight car and the coke-mounted bucket travel, the fire extinguishing freight car may not be able to run completely.

On the other hand, in the case of watering from diagonally above as shown in FIG. 7 of the present embodiment, the installation space of the watering pipe can be reduced as compared with the watering from directly above shown in FIGS. 5 and 6. In the method shown in FIG. 7, when steam or dust is severely scattered from the fire extinguishing freight car to the outside during fire extinguishing, a hanging curtain is hung on the side wall of the fire extinguishing chamber to prevent the steam or dust from scattering to the outside. do it. When the side walls (3 sides) of the fire extinguishing room hinder the running of the dust collecting hood of the guide car 2, the side walls (3 sides) of the fire extinguishing room are opened so that the dust collecting hood of the guide car 2 can run. Then, when the fire is extinguished, a structure that can prevent the scattering of steam and dust by a hanging curtain may be sufficient. By installing the fire extinguishing equipment 7 near the middle portion of the coke oven, the mileage and the traveling time to the fire extinguishing equipment 7 can be shortened, and a decrease in the coke yield can be prevented.

In the sprinkler pipe 17, the opening position of the sprinkler pipe is 0 to 1 m from directly above the end of the bottom plate 19 on the lower end side of the coke mounting box 5 or directly above the end on the lower end side of the bottom plate 19, and the direction in which the carbonization chamber 1 is located. Or place it in a position shifted in the opposite direction. As a result, even if the fire extinguishing equipment 7 is installed in the middle portion of the coke oven, the running of the guide vehicle is not interfered with. The height distances h ₁ , h ₂ and h ₃ from the upper end of the coke mounting box 5 to the sprinkler pipes 17-1 to 17-3 shall be within the range of about ₃ to 7 m. By installing two or more sprinkler pipes, water can be sprinkled over a wide range in the width direction of the coke mounting box. However, if the number of steps is more than four, a large space is required. In addition, if three stages are installed, water can be sprinkled over a sufficiently wide range, so there is no merit to increase the number of stages to four.

However, when watering from diagonally above, there is a problem that the temperature variation of coke after extinguishing the fire becomes large. Therefore, when trying to reduce the water content, coke with a high temperature was generated, and when trying to suppress equipment burning in the latter stage of the wharf, coke with a high water content was generated. This problem is solved by the means described below, and coke with a water content of 5% by mass or less can be stably produced within 20 minutes in a dry air cooling process with a wharf without causing equipment burnout in the subsequent stage of the wharf. I made it possible.

When watering from diagonally 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 located at the farthest place from the watering pipe 17, and the fire can be extinguished reliably. Further, by sprinkling the fire extinguishing water 12 vigorously, the deposited layer of the red hot coke 3 is destroyed, the fire extinguishing water is easily supplied to the lower layer, and the fire extinguishing becomes efficient. However, in order to increase the watering pressure, it is necessary to raise the position of the head tank 11. It is not realistic to make the watering pressure extremely high, and if the fire can be extinguished with a watering pressure of 40 kPa or less without any problem, it is not necessary to raise the position of the head tank 11 more than necessary.

A 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. As a result, the watering status can be monitored at all times. When the sprinkling pressure drops, clean the inside of the sprinkling pipe so that the coke temperature after extinguishing the fire is within the appropriate range. As a means for monitoring the watering situation, it is conceivable to install a flow meter. However, it is not easy to measure the flow rate because it requires space for installing the flow meter. Therefore, it is preferable to install a pressure sensor.

In addition, by providing a height distance from the incandescent coke diagonally upward, even if fine-grained coke is scattered due to the collision of fire extinguishing water, the hole of the sprinkler pipe is not blocked. Therefore, the watering flow rate density (watering amount per 1 m ² ) can be increased. By increasing the sprinkling flow rate density, the incandescent coke deposited in the coke loading box can be cooled uniformly in the depth direction. Furthermore, it is effective to increase the sprinkling flow rate density from the viewpoint of shortening the sprinkling cooling time. The watering flow rate density shall be 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 , fine-grained coke will be scattered severely due to the collision of fire extinguishing water. As a result, the surrounding environment is deteriorated, such as more coke falling than the coke mounting box.

Further, when watering from diagonally above, it is necessary to adjust the amount of watering in consideration of the layer height level of the red coke 3 in the coke mounting box 5, as in the case of watering from directly above. As shown in FIG. 8, the coke mounting box 5 is divided into a plurality of compartments (end A, center, end B) with respect to the traveling direction, and the amount of water sprinkled on the end A and the 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 A and the end B, watering near the lower end of the inclined bottom plate of the coke mounting box should be less than watering at a higher position. The fact that it is preferable not to do it in some cases is the same even when watering from diagonally above. To do this, the sprinkler pipes at the center, end A and end B were connected via loose flanges so that the sprinkling angle could be adjusted at each part. By using the loose flange, it is possible to easily adjust or change the installation angle of the sprinkler pipe. In addition, the installation angle can be adjusted strictly.

Hereinafter, test examples carried out according to the present invention will be described.
<Fire extinguishing coke temperature and coke moisture immediately after wharf payout>
After sprinkling and extinguishing the red-hot coke, the temperature of the coke discharged to the wharf was measured by an infrared thermo-viewer. Continuous measurement was performed at a measurement interval of 1/10 second. The measurement was continued even after the payout was completed. Immediately after the completion of the payout, coke was collected from multiple points in the wharf and its water content was measured. Further, after 10 minutes, 20 minutes and 30 minutes, coke was collected from the same place and the water content was measured. Table 1 shows the test conditions and measurement results.

(Test Example 1-1)
In Test Example 1-1, coke was collected from a place where the coke temperature was 54 ° C. immediately after the wharf was dispensed, and the change in water content was measured. The water content immediately after dispensing was 14.9% by mass. Then, the dry air cooling treatment was continued for 30 minutes, and after 5 minutes, 10 minutes, 20 minutes and 30 minutes, coke was collected from the same place and the water content was measured. However, as shown in Table 1 and FIG. 1, no decrease in water content could be confirmed during the dry air cooling treatment.

(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 dispensed, and the change in water content was measured. The water content immediately after dispensing was 13.8% by mass, but when the dry air cooling treatment was continued thereafter, the water content gradually decreased as shown in Table 1 and FIG. 1, and after 20 minutes, 4.7. It decreased to mass%. That is, the temperature immediately after the wharf is dispensed is 62 ° C.
With the above, it is possible to reduce the water content by drying and air-cooling the wharf.

(Test Example 1-3)
In Test Example 1-3, coke was collected from a place where the coke temperature was 75 ° C. immediately after the wharf was dispensed, and the change in water content was measured. The water content immediately after dispensing was 9.7% by mass, but as shown in Table 1 and FIG. 1, it decreased to 4.1% by mass after drying and air cooling for 10 minutes, and to 3.3% by mass after 20 minutes. ..

(Test Example 1-4)
In Test Example 1-4, coke was collected from a place where the coke temperature was 120 ° C. immediately after the wharf was dispensed, and the change in water content was measured. As a matter of course, the water content was as low as 2.7% by mass immediately after the discharge. As shown in Table 1, the water content was further reduced by the dry air cooling treatment. However, it is extremely difficult to keep all the coke delivered to the wharf above 120 ° C. If this temperature is kept high, the temperature of the entire coke will rise and the maximum temperature will also rise. In this case, there is a concern that the coke temperature does not drop sufficiently during wharf drying air cooling and the blast furnace transport belt is burnt.

FIG. 1 shows the relationship between the drying air cooling treatment time in the wharf and the coke moisture. The measured values obtained in Test Examples 1-1 to 1-3 in Table 1 above are shown. The temperature shown in the legend is a value (initial temperature) measured by an infrared thermo-viewer immediately after the red-hot coke is wet-extinguished and discharged to a wharf. During the dry air cooling treatment with the wharf, there was no reheating as described in Patent Document 3.
From the results of Test Example 1-2 and Test Example 1-3, it was found that even if the temperature of the coke discharged to the wharf is less than 100 ° C., the water content is reduced by the dry air cooling in the wharf. It was found that when the temperature of the coke discharged to the wharf was 60 ° C. or higher, the temperature dropped to 5% by mass or less 20 minutes after the coke was discharged to the wharf. The dry air cooling process is generally said to take 30 to 40 minutes, but if it can be shortened within 20 minutes, the wharf area required for the dry air cooling process can be significantly reduced.

On the other hand, when the control value of the minimum temperature is increased, the temperature of coke rises as a whole. The amount of red-hot 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 will partially rise excessively and the temperature will not fall completely during drying air cooling, and the belt for transporting the blast furnace in the subsequent stage will be burnt. Therefore, the control value of the minimum temperature is preferably 80 ° C. or lower.

<Measurement test of temperature change by dry air cooling treatment>
The temperature change of the coke 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 coke due to the dry air cooling treatment of coke measured in Table 2.

(Test Example 2-1)
The coke having a temperature of 338 ° C. at the time of dispensing 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. in 10 minutes and 166 ° C. in 20 minutes was confirmed. From the viewpoint of suppressing the burning of the equipment transferred to the blast furnace in the subsequent stage, it is essential to cool the coke to a temperature lower than the heat resistant temperature of the equipment transferred to the blast furnace during the drying air cooling period in the wharf. From the results of this test, if the drying air cooling treatment time of the wharf is within 20 minutes, the maximum temperature of coke discharged to the wharf may be 165 ° C. or less in a range exceeding the heat resistant temperature of the transport equipment. For example, when a transport facility having a heat resistant temperature of 180 ° C. is used, the maximum temperature of coke discharged to the wharf may be 345 ° C. or lower. Further, if the maximum temperature of coke can be suppressed to less than 291 ° C., the fire extinguishing coke can be cooled to a temperature lower than the heat resistant temperature of the transport facility even if the drying air cooling treatment time is 10 minutes.

<Coke fire extinguishing test according to the second embodiment>
FIG. 7 is a view of a state in which the fire extinguishing freight car 4 is pulled into the fire extinguishing equipment 7 in the second embodiment as viewed from the traveling direction (front-back direction) of the fire extinguishing freight car.
The width w of the coke-mounted box 5 was 5 m, and the amount of red-hot coke received at one time was 25 tons. The height of the red hot coke layer mounted on 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 drop point as the apex. The inclination angle α of the bottom plate 19 of the coke mounting box 5 was 15 °. The sprinkler pipe 17 was arranged in three stages in the height direction so that the opening position of the sprinkler pipe was directly above the end of the coke mounting box 5 on the lower end side of the bottom plate 19. The height distance h1 from the upper end of the coke mounting box 5 to the lower sprinkler pipe is 5 m, the height distance h2 to the middle sprinkler pipe is 5.7 m, and the height distance h3 to the upper sprinkler pipe is 6.4 m. It was. The sprinkler pipes 171-1 to 17-3 have sprinkler holes 18, and the sprinkling angles α1 and α2 are adjusted so that water is sprinkled from each sprinkler pipe in two directions.

The fire extinguishing water 12 is sprinkled toward the incandescent coke 3 by opening the valve 14 arranged in the sprinkling pipe 13 extending from the head tank 11 installed above the sprinkling pipe 17-1 in the upper stage, and is set. Watering was completed by closing the valve 14 when the time passed.

FIG. 8 is a view of the state in which the coke mounting box 5 is pulled into the fire extinguishing equipment 7 as viewed from a 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 central portion. The length of the sprinkler pipes 17-1 to 17-3 is the same as the length of the coke mounting box 5, so that the fire extinguishing water 12 is sprinkled over the entire existence range of the incandescent coke 3. The watering pipe 17 was divided into three sections, an end portion A, a central portion, and an end portion B, so that the watering angle could be adjusted in each section. The sprinkling pipe 17 divided into three sections is connected via a loose flange 20 so that the sprinkling angle in each section can be easily adjusted. A pressure gauge for measuring the pressure at the time of watering was installed at the end of the watering pipes 17-1 to 17-3.

After the extinguishing of the red hot coke 3 was completed, the coke-mounted box 5 was moved to the wharf, the payout gate 16 of the coke-mounted box 5 was opened, and the extinguished coke was paid out to the wharf. At that time, the temperature of the coke discharged to the wharf was continuously measured by an infrared thermo-viewer. The wharf was subjected to a dry air cooling treatment for 10 to 20 minutes, and then discharged to a transfer facility to a blast furnace. Here, the time from immediately after the completion of the wet-extinguished coke to the wharf until the coke is discharged to the transport facility is defined as the dry air-cooling treatment time. Immediately after being dispensed to the transport facility, or from inside the wharf, coke was collected and its water content was measured. The heat resistant temperature of the transport equipment was 180 ° C.

The test results are shown in Table 3.

(Test Example 3-1)
In Test Example 3-1 the sprinkling angles α1 and α2 were adjusted so as to sprinkle water almost entirely in the width direction of the coke mounting box 5. As shown in FIG. 7, when the total length (w) in the width direction of the coke mounting box is 1 with the upper end of the inclined bottom plate 19 of the coke mounting box 5 as the starting point (zero), the layer height of the incandescent coke 3 is 1. The highest position was around 0.35, and the layer height was gradually lowered from that position toward the lower end of the bottom plate 19 of the coke mounting box 5. Considering such layer height distribution, watering from the watering pipe 17-1 located in the upper stage is in the range of 0.00 to 0.2, and watering from the watering pipe 17-2 located in the middle stage is 0. The angle of the sprinkler pipe was adjusted with the aim of sprinkling water from the sprinkler pipe 17-3 located in the lower stage in the range of 2 to 0.6 and in the range of 0.6 to 0.9. The pressure in the pipe during sprinkling was 5.3 kPa in the upper stage, 11.0 kPa in the middle stage, and 17.5 kPa in the lower stage. From the pressure, the ratio of the amount of water sprinkled 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 sprinkled from the lower sprinkler pipe is the largest.

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

FIG. 9 shows the temperatures of the coke immediately after the start of the payout, the middle stage of the payout, and the late stage of the payout when the coke is paid out from the coke loading box 5 to the wharf (Test Example 3-1).
At the initial stage of dispensing, the coke was sufficiently extinguished, and many coke was overcooled to less than 50 ° C. The coke that is initially discharged exists near the lower end of the bottom plate 19 of the coke mounting box 5. It is probable that the fire extinguishing water 12 was sprinkled most than the measured sprinkling pressure, although the abundance of coke in this part was small. As a result, the coke was overcooled.

On the other hand, in the latter stage of dispensing, the coke temperature was higher than in the initial stage, and coke having a maximum temperature of 476 ° C. was dispensed from the end A. It is considered that the cause was insufficient watering to the portion where the layer height of the red coke 3 was the highest. Due to the existence of such insufficient cooling, some coke remained at a temperature higher than the heat resistant temperature of the equipment for transporting to the blast furnace even after the drying air cooling treatment was performed for 20 minutes. Therefore, in the drying air cooling process for 20 minutes, it could not be delivered to the transport facility to the blast furnace. In addition, 20 minutes later, coke was collected from two places in the wharf and the water content was measured, which were as high as 14.4% by mass and 13.0% by mass. It is also possible that the reason why the coke temperature in the latter half of the discharge was high was that the sprinkling pressure of the upper sprinkler pipe 17-1 was low. The watering 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 watering pressure was low and the fire extinguishing water 12 did not reach sufficiently. The water sprinkled from the upper sprinkler pipe 17-1 can be sprinkled near the upper end of the bottom plate 19 by being placed on the water sprinkling flow from the middle sprinkler pipe 17-2. However, it is possible that it was not enough.

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

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

In Test Example 3-2, water was not sprinkled in the range of 0.7 to 1.0 (near the lower end of the bottom plate of the coke mounting box). That is, no water was sprinkled on the coke that was initially discharged to the wharf. Nevertheless, overcooled coke was dispensed from the ends A and B at the initial stage of payout. This is because the fire extinguishing water 12 sprinkled in the range of 0 to 0.7 near the upper and middle stages of the bottom plate 19 flows downward along the bottom plate of the coke mounting box 5 and near the lower end (0.7 to 1). It is probable that the fire was extinguished and cooled by submerging the red hot coke in .0). Similarly, in the central portion, it is considered that the red hot coke near the lower end (0.7 to 1.0) is cooled by the fire extinguishing water 12 flowing from above the coke. 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 was not sufficiently cooled and the coke with a high temperature was discharged.

As described above, in Test Example 3-2 as well, there were a portion where the coke was excessively cooled and a portion where the coke was insufficiently cooled as in Test Example 3-1. Due to the presence of insufficient cooling, some coke remained at a temperature higher than the heat resistant temperature of the equipment transported to the blast furnace even after the drying air cooling treatment for 20 minutes. Therefore, in the drying air cooling process for 20 minutes, it could not be delivered to the transport facility to the blast furnace. Similar to Test Example 3-1 after 20 minutes, coke was collected from two places in the wharf and the water content was measured, but both were 8.7% by mass and 7.8% by mass, which 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 that, the watering pressure increased overall. Therefore, the direction of the sprinkler pipe was set downward as a whole. Then, the following tests were conducted.
FIG. 11 shows the temperatures of the coke immediately after the start of the payout, the middle stage of the payout, and the late stage of the payout when the coke is paid out from the coke loading box 5 to the wharf (Invention Example 3-1).
In Invention Example 3-1, in order to enhance the cooling of coke discharged from the central portion in the initial stage, in the lower sprinkling pipe 17-3, only the sprinkling hole located in the central portion is referred to as Test Example 3-2. The comparison was downward. That is, water was sprinkled near the lower end of the bottom plate 19 of the coke mounting box 5 only in the central portion. On the other hand, the watering angles of the portions corresponding to the end portion A and the end portion B were the same as those in Test Example 3-2.

As shown in FIG. 7, when the total length (w) of the coke mounting box 5 in the width direction is set to 1 with the upper end of the inclined bottom plate 19 of the coke mounting box 5 as the starting point (zero), the drop position of the fire extinguishing water 12 The water sprinkling from the upper sprinkler pipe 17-1 is in the range of 0.00 to 0.2, and the sprinkling from the middle sprinkler pipe 17-2 is 0.2 to 0.4 at the end A and the end B. The central part was aimed at the range of 0.2 to 0.5. In the lower sprinkling pipe 17-3, the sprinkling from the end A and the end B was aimed at the range of 0.4 to 0.7, and the sprinkling from the center was 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 portion A and the end portion B was low, the sprinkling hole 18 was made so that the water sprinkling on the end portion A and the end portion B was smaller than that in the central portion. Reduced the number of. The amount of water sprinkled on the end A and the end B was set to be 3/5 times that of the central part. By reducing the number of sprinkling holes in the end A and the end B, the watering pressure was increased in Test Example 3-1 and It 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 water sprinkled from the upper, middle and lower stages is estimated to be upper / middle / lower = 26/33/41. The sprinkling flow rate (sprinkling flow rate density) per 1 m ^{2 of the} coke mounting box was 0.6 t / min, and the sprinkling time was 78 seconds. The total amount of water sprinkled is 78 tons. Therefore, 0.78 tons of fire extinguishing water was sprinkled per 1 m ² .

The coke temperatures dispensed to the wharf are as shown in Table 3 and FIG. FIG. 11 is a graph showing the temperature of coke delivered to the wagon from the coke loading box 5 with respect to the traveling direction of the fire extinguishing freight car, divided into the immediate after the start of the payout, the middle stage of the payout, and the late stage of the payout. The temperature distribution of the fire extinguishing freight car with respect to the traveling direction was made uniform as compared with Test Examples 3-1 and 3-2. The minimum temperature of the coke discharged was 63 ° C., which was a temperature at which the water content could be reduced during drying and air cooling with a wharf. On the other hand, the maximum temperature was 162 ° C., which was 165 ° C. or lower in the range exceeding the heat resistant temperature (180 ° C.) of the blast furnace transfer conveyor in the subsequent stage. The average temperature was 97 ° C. When the drying air-cooling treatment time was 10 minutes, the coke was discharged to a blast furnace transport belt, coke was collected, and the water content was measured. As a result, the values were 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 is uniform, so coke with a moisture content of 5% by mass or less can be obtained even by drying and air-cooling for 10 minutes. It is thought that it was.

(Temperature distribution of coke delivered to the wharf)
12 to 14 show the temperature of coke discharged to the wharf and its cumulative ratio in Test Examples 3-1 and 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. Further, 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 of 300 ° C. or higher. Therefore, 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 why the coke moisture content was the lowest in Invention Example 3-1 is that the minimum temperature was higher than the 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 drying air cooling treatment. Further, when the temperature of the coke discharged to the wharf exceeds 100 ° C., it is considered that the water content is extremely low at the time of discharge. Therefore, in the range exceeding 100 ° C., it seems that there is no big difference in the water content even if the temperature is further increased. For example, coke at 150 ° C. is considered to have a lower water content than 120 ° C., but it is considered that the water content is sufficiently low even at 120 ° C., so that there is no significant difference from 150 ° C. Temperatures below 100 ° C. should be less. In particular, it is important to reduce the ratio of coke below 60 ° C., which cannot be expected to reduce the water content by the dry air cooling treatment. 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 the result of watering from diagonally above shown in FIGS. 7 and 8, but similarly, in the case of watering from directly above shown in FIGS. 5 to 6, coke is used at the end A and the end B. Watering near the lower end of the bottom plate 19 of the mounting box 5 should be less than watering at a higher position. Not necessary in some cases. This is because the fire extinguishing water 12 sprinkled on the upper end as described above flows downward along the bottom plate of the coke mounting box 5 and submerges the red hot coke near the lower end (0.8 to 1.0). I think it is for extinguishing and cooling. By not sprinkling water in this vicinity, overcooling of coke is suppressed. Similarly, in the central 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 A and the end B and the coke temperature is high, the coke is not sufficiently cooled. Therefore, it is necessary to sprinkle water near the lower end in the central part. When water is not sprinkled from the sprinkling pipes corresponding to the end A and the end B toward the lower end of the bottom plate of the coke mounting box, the coke mounting box may be moved forward or backward by about 1 to 2 m during sprinkling. As a result, the end portion of the coke mounting box may be moved to the vicinity of the central portion of the sprinkler pipe, and water may be temporarily sprinkled near the lower ends of the end portion A and the end portion B of the coke mounting box.

Further, the layer height of the red 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 sprinkled on the end portion A and the end portion B to 0.4 or more and 0.8 or less in the central portion, the coke temperature after fire extinguishing is made uniform and coke with low water content can be obtained.

In order to confirm the merit of setting the fire extinguishing equipment in the center of the hearth, the time required for the fire extinguishing freight car 4 to go back and forth between the fire extinguishing equipment 7 in order to extinguish the red coke was determined by simulation. It was decided to supply coke to a blast furnace having an amount of pig iron per sunrise of 10,000 tons, and the amount of coke required per day in the blast furnace was set to 3,200 tons. Assuming that the coke produced in one kiln in the carbonization chamber is 20 tons, the number of times of extrusion per day is 160 times.
In case 1, it was assumed that a fire extinguishing system was installed at the end of the furnace group as shown in FIG. Closest No. The distance traveled from one carbonization chamber to the fire extinguishing equipment was 20 m one way. Adjacent No. 2 The distance from the carbonization chamber is 1.5 m, that is, No. 2 The distance traveled from the carbonization chamber to the fire extinguishing equipment was 21.5 m, and the farthest No. 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 cars from the 160 carbonization chambers to the completion of extrusion is 44.6 km (round trip). Assuming that the running speed of the fire extinguishing freight car and the coke-mounted box is 100 m / min (6 km / h), the total running time is 7.4 hours.
In case 2, as shown in FIG. 16, it was assumed that a fire extinguishing system 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 the No. 81 carbonization chamber closest to the fire extinguishing equipment to the fire extinguishing equipment was set to 20 m. The distance to the adjacent carbonization chamber is 1.5 m, and the distance to the No. 1 carbonization chamber or 160 carbonization chamber located farthest from the fire extinguishing equipment is 138.5 m, respectively. The total travel distance of the fire extinguishing freight car and the coke-mounted box is 25.4 km (round trip), which is 19.2 km shorter than that of Case 1. Assuming that the running speed of the fire extinguishing freight car and the coke-mounted box is 100 m / min (6 km / h), the total running time per day is 4.2 hours, which is 3.2 hours shorter than that of Case 1.
The fire-extinguishing freight car 4 travels with the red-hot coke mounted on it because it is half the traveling time for moving 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 red hot coke that burns in contact with air by 43%.
Table 4 summarizes the comparison between Case 1 (FIG. 15) and Case 2 (FIG. 16).

Other merits of installing fire extinguishing equipment in the center of the hearth are as follows. In case 2, the mileage of the fire extinguishing freight car and the coke-mounted box can be shortened by 19.2 km per day as compared with case 1. Therefore, the fuel cost of the fire extinguishing freight car can be reduced.
In addition, many coke ovens have deteriorated equipment, and an abnormality may occur in the rail 6 on which the fire extinguishing freight car and the coke-mounted bucket run. For example, if there is an abnormality in A of FIG. 15, in case 1, the fire extinguishing freight car and the coke-mounted box cannot run at all. On the other hand, in the case of Case 2, even if there is an abnormality at the location B in FIG. 16, if Wharf 8-1 to 8-3 are arranged on both sides of the fire extinguishing equipment, No. It is possible to extrude from 1-80 kilns, extinguish the red coke and pay it out to the wharf. In the meantime, it is also possible to deal with the anomaly that occurred at location B. In such a case, in case 1, it is possible to deal with it by installing fire extinguishing equipment at both ends, but it is not economical because two fire extinguishing equipment must be installed. In addition, the area for installation must be taken into consideration.

Further, assuming that the amount of coke required per day in the blast furnace is 3,200 tons and the amount of coke produced in one kiln in the carbonization chamber is 20 tons, the number of times of extrusion per day is 160 times. For that purpose, the average of one cycle (removal and installation of the furnace lid, installation of the lattice, slaughter of red-hot coke, transfer to fire extinguishing equipment, sprinkling fire extinguishing work, dispensing to the wagon, transfer to the carbonization chamber) should be within 9 minutes. It is necessary to make the travel time for the fire extinguishing freight car to and from the carbonization chamber and the fire extinguishing equipment as short as possible. In order to realize this, it is effective to increase the traveling speed of the fire extinguishing freight car, but it is more effective if the traveling distance can be simply shortened. In addition, if any trouble occurs, it may not be possible to extrude the red coke during that time. Even if the extrusion is restarted after the trouble is recovered, it is desirable to shorten the cycle time. Even if extrusion is stopped due to trouble, carbonization proceeds in the carbonization chamber. Therefore, when the extrusion is resumed, carbonization may be completed in many carbonization chambers. In that case, the cycle time in the extrusion operation will affect the coke productivity. In order to increase coke productivity, case 2 in which the cycle time can be shortened 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, extruding after the carbonization time has become long should be performed immediately, and Case 2 in which the travel time of the fire extinguishing freight car can be shortened is effective.

The fire extinguishing equipment is installed in the center of the furnace group, and the red hot coke extruded from the coke kiln can shorten the time to move to the fire extinguishing equipment by the fire extinguishing freight car, and the necessary coke in the blast furnace can be reliably supplied. It can also be used to prevent a decrease in yield due to combustion and burning of incandescent 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 loading box 6: Rail 7: Fire extinguishing equipment 8; Wharf 9: Coke 10: Conveyance equipment 11: Head tank 12: Fire extinguishing water 13: Watering piping 14: Valve 14-1: Valve 14-2: Valve 14-3: Valve 15: Watering nozzle 16: Discharge gate 171: Watering pipe (upper stage)
17-2: Sprinkling pipe (middle stage)
17-3: Sprinkling pipe (lower)
18: Sprinkler hole 19: Bottom plate 20: Loose flange 21: Pusher ram

Claims (8)

The red-hot coke extruded from the carbonization chamber is sunk into the coke-mounted box towed by the fire-extinguishing freight car, and then water is sprinkled from the watering pipe in the fire-extinguishing facility to the red-hot coke existence range in the coke-mounted box. Wet fire extinguishing equipment
The fire extinguishing system is located in the center of the coke oven.
The sprinkler pipes in the fire extinguishing chamber are arranged at different heights of 2 to 4 steps directly above or near the lower end of the inclined bottom plate of the coke mounting box .
When the red hot coke existence range in the coke mounting box is divided into three parts, an end portion A, a central portion, and an end portion B in the direction of travel of the fire extinguishing freight car, the sprinkling pipe of the end portion A, the central portion, and the end portion B However, a wet fire extinguishing facility for red-hot coke, which is connected via a loose flange and the sprinkling angle of the sprinkling pipe is set for each location . Before SL is watering angle of the water spray pipe of the central portion, wet quenching equipment red hot coke according to claim 1, characterized in that the downward against water spray angle of the end A and the end B. The wet fire extinguishing system for red-hot coke according to claim 1 or 2 , wherein the pressure inside the watering pipe during the watering treatment is 10 kPa or more and 40 kPa or less. The red hot coke according to any one of claims 1 to 3 , wherein the water sprinkling flow rate per 1 m ² at the time of sprinkling treatment is 0.5 t / min or more and 1.5 t / min or less on average. Wet fire extinguishing equipment. The watering of the front Kitan section A and the end B, any of claims 1 to 4, characterized in that 0.4 to 0.8 of the watering amount to the central portion one Wet fire extinguishing equipment for red hot coke as described in the section. When the width direction entire length of the front Symbol coke mounted box 1, the watering in the width direction of the coke mounting box in the end A and the end B, starting from the upper end of the inclined bottom plate of the coke mounting box , The wet fire extinguishing system for red coke according to any one of claims 1 to 5 , wherein the fire extinguishing system is performed only in the range of 0.0 or more and 0.8 or less. When extruding the red hot coke from the carbonization chamber to the coke mounting box, a temperature sensor is permanently installed at the tip of a pusher ram equipped in the extrusion device, the temperature in the carbonization chamber at the time of extrusion is measured, and the temperature in the carbonization chamber is used as a base. The wet fire extinguishing apparatus for red hot coke according to any one of claims 1 to 6 , wherein the water flow rate of the red hot coke is adjusted. The wet fire extinguishing system for red-hot coke according to any one of claims 1 to 7 , wherein fire extinguishing water is sprinkled diagonally downward from the sprinkling pipe.

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