JP3264133B2 - How to prevent black smoke emission from coke oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing the generation of black smoke which is easily generated when charging coal into a coking chamber of a coke oven.

[0002]

2. Description of the Related Art In a coke oven, coal is carbonized under a predetermined condition, and a coke product is discharged from the coke (hereinafter referred to as "kiln removal"), and then a series of coal charging operations is performed. enter.
After the coal is charged into the coking chamber, it is heated from the combustion chambers adjacent to both sides of the coking chamber through the refractory brick partition walls.
In the combustion chamber, so-called Mix gas obtained by mixing blast furnace gas and coke oven gas is used as fuel to maintain a predetermined air / fuel ratio (so-called air-fuel ratio) to perform appropriate combustion. However, the partition wall between the carbonization chamber and the combustion chamber is
Due to temperature changes during the operation of the coke oven and physical effects from the coal or coke, the refractory bricks are subject to wear such as joint breaks and cracks. For this reason, the airtightness between the carbonization chamber and the combustion chamber is lost in the coke oven during the actual operation.

[0003] Therefore, when the pressure in the coking chamber rises above a certain value, the dry distillation gas in the coking chamber flows into the combustion chamber through the cracks and the like, and the air-fuel ratio decreases and fluctuates. The generation of black smoke from the chimney of the coke oven is caused by the decrease and fluctuation of the air-fuel ratio due to the intrusion of the carbonized gas into the combustion chamber for the reasons described above, that is,
Due to lack of oxygen. Although CO is not detected in the flue gas during normal operation, black smoke is generated when it is contained at about 0.3% or more. Such intrusion of the carbonization gas from the carbonization chamber into the combustion chamber occurs because the following coal charging operation is performed in the coke oven equipment having the following configuration.

[0004] A coke oven group usually has 20 to 30 carbonization chambers and combustion chambers adjacent to both sides of each carbonization chamber. FIG. 8 is a conceptual diagram of a main part for explaining a piping system of a conventional coke oven facility. The carbonization gas generated from the coal in each of the carbonization chambers 1a to 1h is supplied to each of the risers 3a to 3h and each of the curved tubes 41 to 41.
48 to the dry main 5 and the piping duct 7
Through the suction main 8, the air is suctioned by the blower 18 and sent to the chemical plant.

FIG. 9 is a detailed vertical sectional view showing a piping system in which the dry distillation gas is sucked from a predetermined carbonization chamber in FIG. 8 to the suction main. The rising pipe 3 is provided with a top cover -3a which can be opened and closed at the top, a curved pipe 4 is branched from an intermediate part, and a middle water spray nozzle 9 is provided at an upper part of the middle of the inside of the bent pipe 4, and the middle water spray nozzle 9 is appropriately low pressure. Alternatively, it has a function of spraying a high pressure spray to the carbonized gas. A margin damper 4a is provided near the exit from the curved pipe 4 to the dry main 5, and the opening and closing of the margin damper 4a allows the dry distillation gas to open and close to the dry main 5. A pressure regulating valve 6 is mounted in the middle of the piping duct 7, and a pressure gauge 13 is mounted inside the dry main 5 near where each curved pipe 4 is connected to the dry main 5.

On the other hand, a direct cause of the phenomenon that black smoke passes through the dry main 5 and the suction main 8 from the chimney during the charging operation of the coal into the coking chamber is that the pressure in the dry main 5 rises above a certain value. Is to do. This increase in pressure can be achieved by switching the low-pressure spray from low pressure to high pressure, that is, from about 7 kgf / mm ² to about 30 kgf / mm ^2.
By switching the ~35kgf / mm ^2, it is because a large amount of air entering from coal charging in hole or the like, dry the main 5
The internal pressure greatly exceeds the target value, and a large pressure fluctuation occurs. Moreover, it takes several minutes for the pressure to stabilize as before.

[0007] The conditions for the air to enter the dry main 5 are that the coal charging hole 2 is open, the edge damper 4a is open, and high-pressure low-temperature water is injected. Are all satisfied.

[0008] As described above, what is important as the coal charging operation related to the generation of black smoke is the opening (a) of the bevel damper between the curved pipe and the dry main, and the switching of the high-pressure water-supply spray (b). ) And three operations of opening (c) of the coal charging hole and adjusting the opening of the pressure adjusting valve 6.

On the other hand, except for the coking chamber during the coal charging operation, the margin dampers attached to the other coking chambers of the same furnace group are open, and the carbonization generated from the other coking chambers is open. The gas is being sucked through the dry main 5.
Therefore, the sudden large pressure rise and large pressure fluctuation in the dry main 5 cause the dry distillation gas being sucked to
Backflow / fluctuation is performed into the other coking chamber via the curved pipe 4 and the riser pipe 3 of the other coking chamber. Due to the rise / fluctuation of the pressure in the carbonization chamber due to the backflow / fluctuation, the carbonized gas in the carbonization chamber enters the combustion chamber through a crack / damaged portion of the partition wall from the combustion chamber. In this way, when the air-fuel ratio in the combustion chamber adjacent to the other carbonization chamber where the coal charging operation is not performed falls below the critical value, black smoke is generated due to the unburned fuel.

[0010] In order to prevent the generation of black smoke described above, there is disclosed a technique for suppressing a large rise in pressure in a dry main at the time of charging coal. For example, in Japanese Patent Application Laid-Open No. Hei 6-93267, in the coal charging operation, the pressure in the dry main suddenly rises at the moment when the margin damper is switched from the closed state to the open state. The opening adjustment operation cannot follow immediately,
A technique has been disclosed that aims to solve the problem that black smoke is generated because it takes a long time for the rapidly increased pressure to return to the normal pressure.

That is, before starting the coal charging operation,
The following PIC control or DDC control, that is, in order to suppress the pressure in the dry main from sharply increasing, detect the pressure in the dry main and use it to eliminate the difference from the target pressure value. The feedback control for correcting the opening of the pressure regulating valve between the dry main and the suction main is performed, and when the coal charging operation is started, before the margin damper in the closed state becomes open, P
Send to the IC control device, add the preset opening, and
Feed forward control for outputting to a control damper (referred to as a pressure regulating valve) of an IC is performed (see Japanese Patent Laid-Open No. Hei 6-93).
No. 267, column 1, claims 13-2
Technology whose gist is to refer to line 7 (hereinafter referred to as "prior art")
Is disclosed.

[0012]

In the production of coke described above, after completion of carbonization of coal in the coking chamber, main unit operations in a series of coal charging operations performed after the coke kiln discharging operation, That is, the opening (a) of the bevel damper between the curved pipe and the dry main, the switching to a high pressure and a high pressure of the water spray (b), and the opening (c) of the coal charging hole.
The order in which the unit work is performed differs depending on the operation state of the coke oven. It is desired to prevent the generation of black smoke when charging coal without being limited to the order of the three unit operations.

However, it is difficult for the control method according to the prior art to always satisfy such requirements. That is, the control method according to the prior art is described as follows: "The moment the collecting damper is switched from the closed state to the open state, the collecting main (the same as the dry main) pressure rises sharply. However, the same pressure cannot be immediately followed, and it takes a long time for the rapidly rising pressure to return to the normal pressure. "
Column, lines 38-41), and furthermore, "The operation signal is sent to the PIC before the bordering damper changes from the closed state to the open state.
To the control device of
Output the C control damper (indicating the pressure regulating valve) "
(Refer to column 1 of the specification of JP-A-6-93267, claims, lines 23 to 25), the pressure in the dry main is reduced to a negative pressure, and the outside air is sucked and excess dry distillation gas is generated. There is a danger of ignition etc. in the electric dust collector after air is mixed in and delivered to the chemical plant via the suction main after it is delivered. As described above, it is difficult to sufficiently prevent black smoke from being generated by the method of the prior art, and additional problems arise.

Therefore, in order to avoid the danger of ignition in the above-mentioned electric precipitator, it is necessary to increase the opening of the pressure regulating valve at least after the inside of the dry main is opened to the outside air through the coal charging hole of the coking chamber. is important. Moreover, in order to prevent the generation of black smoke, the carbonization gas in the dry main should not flow back to the "non-coal charging operation carbonization chamber" and, as a result, to the combustion chamber adjacent to them. Therefore, the internal pressure of the dry main must not be excessively increased. Therefore, the point in time when the coal charging hole starts to be opened is important in determining the point in time when the opening degree of the pressure regulating valve is adjusted. On the other hand, the effect of increasing the opening of the pressure regulating valve affects the position of the coal charging hole, but there is a delay in gas propagation. However,
Since the length of one furnace group of the coal furnace is as long as about 60 to 70 m, the distance between the carbonization chamber and the pressure regulating valve during the coal charging operation greatly differs depending on which carbonization chamber is used for charging coal. The longer this distance is, the shorter the time from the start of opening of the coal charging hole to the point of time when the opening of the pressure regulating valve is adjusted, the internal pressure of the dry main rises above an appropriate value and black smoke is generated. Such a problem occurs.

As described above, the opening of the pressure control valve is increased only after the inside of the dry main is opened to the outside air through the coal charging hole of the coking chamber, and the pressure is adjusted from the coking chamber during the coal charging operation. It is desired to determine the timing of a command for controlling the pressure regulating valve according to the distance to the valve.

Further, since the amount of dry distillation gas generated in the carbonization chamber per unit time depends on the so-called coke operating rate, the opening adjustment amount of the pressure regulating valve also depends on the coke operating rate. Therefore, it is desirable to determine the amount of adjustment of the opening in accordance with the relationship between the opening of the pressure regulating valve and the flow rate of the carbonization gas.

It is, therefore, an object of the present invention to provide a method for preventing the emission of black smoke during a coal charging operation in a coke oven operation by solving the above-mentioned problems.

[0018]

SUMMARY OF THE INVENTION The present invention has been derived from studies by the inventors in the operation of a coke oven, and the gist of the invention is as follows.

The method for preventing black smoke emission of a coke oven of the present invention (hereinafter referred to as "first invention") is provided on both sides of each of the carbonization chambers of a coke oven group comprising a plurality of carbonization chambers and a plurality of combustion chambers. Each of the combustion chambers is disposed, and the carbonization chamber and the combustion chamber are separated by a firebrick wall, and each of the carbonization chambers is connected to a header tubular dry main via a riser pipe and a curved pipe, The dry main is connected to the suction main, and the suction main is sucked by a blower, while a water injection nozzle is mounted inside the curved pipe, and a bevel damper is mounted at an outlet of the curved pipe, and In the operation of a coke oven in which a pipe duct connecting the dry main and the suction main is provided with a pressure regulating valve, in the operation of charging coal into the coking chamber after the kiln is discharged. , At least the following three steps: a step of opening the edge cutting damper between said dry main and the bent pipe, high pressure weaker water spray from the weaker water injection nozzle
And the time when the inside of the dry main and the outside air of the carbonization chamber start to open through the step of injecting air and the step of opening the coal charging hole of the carbonization chamber are defined as time 0 (zero). of the (zero) from the following (a) to (c) command: the opening of the case from (i) a time 0 to a first predetermined time t _1, the time 0 (zero) the opening degree of the pressure regulating valve it holds, then (b) the first from a predetermined time t ₁ to a second predetermined time t _2, the increasing degree of opening of the pressure regulating valve by a first predetermined opening degree .DELTA.k _1, and then (C) reducing the opening of the pressure regulating valve by a second predetermined opening amount Δk ₂ from the _second predetermined time t ₂ to the third predetermined time t ₃ , provided that the second predetermined time Opening amount Δk ₂
Is characterized in that a command including a value smaller than the first predetermined opening amount Δk ₁ is transmitted to the pressure regulating valve, thereby performing feedforward control of the pressure in the dry main. .

A further preferred method of preventing black smoke emission from a coke oven according to the present invention (hereinafter referred to as "second invention") is as follows.
In the invention, the values of the first predetermined time t ₁ , the second predetermined time t ₂ , and the third predetermined time t ₃ are calculated according to the distance between the carbonization chamber and the pressure regulating valve. It is characterized by being stipulated.

A still further preferred method of preventing dust in a coke oven according to the present invention is the method of the first and second aspects, wherein the first predetermined opening amount Δk ₁ and the second predetermined opening amount Δk ₂ It is characterized in that the value is determined based on the relationship between the opening degree of the pressure regulating valve and the flow rate of the carbonization gas.

[0022]

The coke oven equipment used in the present invention is of the following type, that is, each of the combustion chambers is located adjacent to each of the coking chambers of a coke oven group comprising a plurality of coking chambers and a plurality of combustion chambers. Is disposed, and the carbonization chamber and the combustion chamber are partitioned by a refractory brick wall, each of the carbonization chambers is connected to a header-tubular dry main via a rising pipe and then a curved pipe, and the dry main is a suction main body. The suction main is connected to a main, and the suction main is suctioned by a blower, while a water injection nozzle is mounted inside the curved pipe, and a bevel damper is mounted at an outlet of the curved pipe, and A pressure regulating valve is provided in the pipe duct connecting the suction main and the suction main, so that the coal charging operation into any one of the coking chambers causes When the force varies, the same co - to cause all other carbide chamber pressure fluctuations box furnace group.

According to the present invention, regarding the order of the main coal charging operation into the coking chamber, the bevel damper between the curved pipe and the dry main is opened, and then the spray pressure from the water injection nozzle is reduced from low pressure. Switch to high pressure and then open the coal charging hole in the coking chamber. As described above, when the spray pressure from the water injection nozzle is switched from low pressure to high pressure, the coal charging hole in the carbonization chamber is still closed, so the high pressure water injection spray intrudes into the dry main. The amount of air to be controlled is suppressed, and the pressure inside the dry main does not sharply increase.

The coal charging hole in the coking chamber actually starts to open, and after a lapse of a predetermined time from this point, the opening of the pressure regulating valve is increased. By mitigating a sudden large amount of air entering the main, it acts to mitigate the additive suction effect on the dry main from the suction main. This has the effect of suppressing a large increase in the primary pressure inside the dry main.

If the rim damper is not opened before switching the spray pressure from the low-water injection nozzle from low pressure to high pressure, problems such as damage to the rim damper occur.

In adjusting the opening degree of the pressure regulating valve, first, the opening amount (Δk ₁ −Δk ₂ ) is added from the beginning, the first opening amount Δk _{1 is} increased _first , the second opening amount is maintained for a predetermined time, and then the second opening amount is maintained. Is reduced by the predetermined opening amount Δk ₂ (where Δ
Since k ₁ > Δk ₂ ), the speed of valve operation can be increased, and a sudden excessive increase and fluctuation of the dry main internal pressure can be reduced.

The first predetermined time t ₁ , the second predetermined time t ₂ , and the third predetermined time t, depending on the distance between the carbonization chamber and the pressure regulating valve during the coal charging operation. By determining the value of ₃ , the timing of the opening adjustment operation of the pressure adjustment valve can be made more appropriate.

When the flow rate of the gas is small, the difference between the opening of the pressure control valve and the flow rate of the gas passing through the pressure control valve is 1
Although there is a relationship that can be approximated by the following equation, it deviates from the linear equation as the gas flow rate increases. Therefore, the opening of the pressure regulating valve should be adjusted according to the gas flow rate.

[0029]

Next, the present invention will be described in more detail with reference to examples. FIG. 1 is a conceptual diagram of a main part for explaining an overall outline of coke oven equipment in one embodiment of a method for preventing black smoke emission from a coke oven of the present invention. 1 coke furnace group A
Is composed of 26 carbonization chambers 1 and 27 combustion chambers 19 provided on both sides of each carbonization chamber 1, comprising 26 carbonization chambers 1.
Is connected to one dry main 5 corresponding to a so-called header-tube via a riser 3 and a bent pipe 4 which each has, and a duct branched from one central portion of the dry main 5 in the longitudinal direction of the furnace group. Reference numeral 7 is connected to the suction main 8 and further connected to a so-called chemical plant via a blower (not shown). Raw gas generated during coke production (hereinafter referred to as "carbonized gas") is transported to the chemical plant by the above piping system and becomes a raw material for chemical products.

FIG. 2 is a conceptual diagram illustrating one embodiment of the method for preventing black smoke emission from a coke oven according to the present invention. The type of coke oven used in this example was of the Wilput-Ott type, and the dimensions of the carbonization chamber: width 0.43 × depth 1
5.4 x 6.5 m in height, volume: 39 m ³ , maximum output 1
600 tons / day. A coal charging hole 2 for charging 4 to 5 coals is provided in an upper part of the coking chamber 1 of the coke oven, and a coal charging hole lid 2a is attached to each of them. On the other hand, an ascending pipe 3 is connected to the carbonization chamber 1, and a top cover -3 a that can be opened and closed is provided at the top of the ascending pipe 3. Are linked. Each of the other 25 coking chambers (not shown) belonging to one furnace group A to which the coking chamber 1 belongs is connected to the dry main 5. One pipe duct 7 having a pressure regulating valve 6 is connected thereto, which is connected to a suction main 8, and the suction main 8 is connected to a suction blower (not shown).

On the other hand, a water supply nozzle 9 is mounted in the middle of the curved pipe 4 and is connected to a low pressure water supply pipe 11 and a high pressure water supply pipe 12 via a three-way solenoid valve 10. In front of the connection from the curved pipe 4 to the dry main 5, a bevel damper 4a is provided.
And the downstream side from the dry main 5 to the suction main 8 side.

On the other hand, a pressure gauge 13 is attached to the inside of the dry main 5 near each of the curved pipes 4 (including those not shown) connected to the dry main 5. The pressure control valve 6 and the pressure gauge 13 are connected to a valve opening adjuster 14, which is connected to a main processor 15.

A command signal for opening the charging hole cover 2a is transmitted from the wireless transmitter 16a on the 16 coal-equipped vehicles to the wireless receiver 17a in the operation room 17. The valve opening regulator 14 receives a signal from the pressure gauge 13 and a signal from the main calculator 15 to open the coal charging hole lid 2a, increases the opening of the pressure regulating valve 6, and holds this for a predetermined time. Further, it has a function of changing the opening of the pressure regulating valve 6 in response to other predetermined signals from the pressure gauge 13 and the main arithmetic unit 15 and holding the same for a predetermined time.

Using the above-described apparatus, the following steps
Prevented black smoke emission when charging coal into the coking room.

After the coal dry distillation in the coking chamber 1 is completed, the riser 3
The top cover 3a at the top is closed, and then the trimming damper 4a is opened. When the opening is completed, the low-pressure water pipe 11 is switched to the high-pressure water pipe 12 by the operation of the three-way solenoid valve 10, and the water nozzle 9 to 35 kgf / mm ² pressure
Is sprayed. Next, a command to open the coal charging hole lid 2a is opened by the operator by pressing the lid removal start button, and it is detected that the coal charging hole lid 2a actually starts to be opened. That is transmitted from the upper radio transmitter 16a to the radio receiver 17a in the operation room 17 and transmitted from the radio receiver 17a to the main computer 15. The main computer 15 receives the signal indicating the start of opening of the coal charging hole lid 2a and, at the same time, transmits a signal to that effect to the valve opening regulator 14.

FIG. 3 is a graph showing the result of pressure control in the dry main in the embodiment of the present invention, and FIG.
5 is a graph showing a result of pressure control in a dry main in a comparative method. That is, both FIG. 3 and FIG. 4 show temporal changes of the dry main internal pressure, the commanded opening degree of the pressure regulating valve, and the actual opening degree before the opening of the charging hole lid is started for about one minute.

The control target value of the internal pressure of the dry main is 6.5 mmH ₂ O in both the method of the present invention and the comparative method. In the comparative method, when the coal is charged into the coking chamber, the control target value by the PID control is used. Debug control was implemented.

Before the coal charging operation into the carbonization chamber 1 is started, that is, before the coal charging hole lid 2a is opened, the opening degree control of the pressure regulating valve 6 is performed by PID (P: 250) as a comparative method. ,
I: 2.5, D: 0.12). Next, after the radio receiver 17a receives the start signal of the coal charging hole lid 2a “open”, the valve opening degree adjuster 14
When 3.5 seconds have passed from the time when the signal to start opening the coal charging hole lid 2a has been received, the pressure regulating valve 6
The opening degree of the pressure regulating valve 6 is set to 33% of the opening degree up to this point by "4
Increase to 7% and hold for 1.6 seconds. " Then, when the above 1.6 seconds have elapsed,
The valve opening adjuster 14 sends a command to the pressure adjusting valve 6 to “decrease the opening of the pressure adjusting valve 6 to 41% and hold it for 2.0 seconds”. After the operation of the pressure regulating valve 6 is completed by issuing the above command, the opening control of the pressure regulating valve 6 is returned to the feedback control before the control of the pressure regulating valve according to the method of the present invention is started.

In the comparative method, as can be seen from FIG. 4, it takes about 9 seconds after the command is issued that the actual opening of the pressure regulating valve approaches 41% of the command value after the opening of the charging hole cover. ,
Thereafter, it fluctuates for about 21 seconds. Dry main internal pressure due to this, for about 40 seconds after the opening of the instrumentation in hole lid has reached varies the maximum value 35mmH ₂ O or more 10 mm H ₂ O or more.

On the other hand, in the method of the present invention, FIG.
As can be seen, after the opening of the charging hole lid, the actual opening degree of the pressure regulating valve approaches 41% of the command value, but is shortened to about 6 seconds after issuing the command, and thereafter fluctuates for about 20 seconds. Yes, but the variation is smaller than in the comparative method. Therefore, the internal pressure of the dry main is set to 10 after opening the charging hole lid.
It does not exceed more than mmH ₂ O, and the maximum value is 8.8 mmH ₂ O
, The lowest value is 3.8 mmH ₂ O, and fluctuates during this period,
Good results of median about 6.3mmH ₂ O was obtained.

FIG. 5 is a graph schematically showing the change with time of the valve command opening from the results shown in FIGS. 3 and 4.
In the method of the present invention shown by a solid line, the feed-forward control is performed during the time t = 3.5 to 7.1 seconds, and the conventional feedback control is performed in other time zones. The comparison method shown by the broken line is a case where the conventional feedback control is performed from beginning to end.

FIG. 6 shows the pattern of the method of the present invention in adjusting the opening degree of the valve, but the time during which the opening degree of the pressure adjusting valve before time 0 is maintained from time 0 (hereinafter referred to as “T ₁ ”). The opening amount (hereinafter, referred to as “α ₁ ”) that is too short than the appropriate value and that subsequently increases.
FIG. 6 is a graph showing an example of a change with time of the actual valve opening and the internal pressure of the dry main in a case where (see FIG. 5) is too large. In this case, when the actual valve opening is increased, the internal pressure of the dry main suddenly decreases to a negative pressure, and then rapidly increases to 1
0 mmH ₂ O or more.

FIG. 7 shows that T ₁ is larger than the proper value and α
₆ is a graph showing an example of a change with time of the actual valve opening and the dry main internal pressure when ₁ is too small. In this case, when the actual valve opening is increased, the internal pressure of the dry main rapidly fluctuates greatly to 15 mmH ₂ O or more.

As described above, unless the opening of the pressure control valve is increased at an appropriate timing according to the distance between the pressure control valve and the carbonization chamber, the internal pressure of the dry main cannot be controlled to a desired state.

As a basic matter in determining the opening adjustment amount of the pressure adjustment valve in the present invention, the relationship between the opening degree of the pressure adjustment valve and the flow rate of the carbonization gas is not always linear, but the opening amount Becomes larger, the gas flow rate becomes larger than the value calculated from the linear relationship. Therefore, the opening of the pressure regulating valve before the start of the coal charging operation (hereinafter referred to as “base opening”)
When the base opening is small, the increase in the opening must be smaller than when the base opening is small.

For example, when the flow rate of the dry distillation gas generated due to the low operation rate of the coke oven is small, the base opening may be small and the opening increase may be large. On the other hand, when the coke oven has a high operation rate and the flow rate of the carbonization gas is large, the base opening is large, and the increase in the opening must be reduced.

Table 1 shows the valve characteristics at 1000 A piping,
That is, this is an example showing the relationship between the valve opening and the gas flow rate. As the valve opening increases, the CV value corresponding to the gas flow rate increases, and the amount of increase in the CV value (ΔCV value) increases. Therefore, when the operating rate of the coke oven changes, the base opening is changed and the opening increments α ₁ and α ₁ are increased.
₂ (see FIG. 5) also needs to be changed.

[0048]

[Table 1]

[0049] Table 2, in each case at the time of low operation and during high occupancy in the present invention, base - increase of the scan angle and proper opening corresponding to alpha ₁ and alpha _2, as well as proper An example of the values of the opening retention times T ₁ , T ₂ and T ₃ (see FIG. 5) is shown.

[0050]

[Table 2]

Table 3 shows that, for the reasons described above, the distance between the carbonization chamber and the pressure regulating valve, and the opening in consideration of both the relationship between the opening of the pressure regulating valve and the gas flow rate. increase alpha ₁ and alpha _2, as well, an example of a proper opening holding time T _1, the values of T ₂ and T _3.

[0052]

[Table 3]

[0053]

As described above, according to the present invention, it is possible to control the pressure in the dry main and the pressure in the carbonization chamber during the coal charging operation of the coke oven operation within an appropriate range. It is possible to provide a method capable of reliably preventing the generation of black smoke from the chimney, and further to prevent gas leakage from a coal charging hole or the like, thereby providing an industrially extremely useful effect.

[Brief description of the drawings]

FIG. 1 shows a method of preventing black smoke emission from a coke oven according to the present invention.
It is a key section conceptual diagram of coke oven equipment in an example.

FIG. 2 shows a method for preventing black smoke emission from a coke oven according to the present invention.
It is a conceptual diagram explaining embodiment.

FIG. 3 is a graph showing a result of pressure control in a dry main in an embodiment of the method of the present invention.

FIG. 4 is a graph showing a result of pressure control in a dry main in a comparative example.

FIG. 5 is a graph showing an example of a command content for adjusting the opening degree of the pressure adjusting valve in the embodiment of the present invention.

FIG. 6 is a graph showing an example of a change over time of a valve opening and a dry main internal pressure when T ₁ and α ₁ are not proper in a coal charging operation.

FIG. 7 is a graph showing another example of the change over time in the valve opening and the dry main internal pressure when T ₁ and α ₁ are not appropriate in the coal charging operation.

FIG. 8 is a conceptual diagram showing a main part of a piping system of a conventional coke oven facility.

9 is a detailed longitudinal sectional view showing a piping system in FIG. 8 in which a dry distillation gas is sucked from a predetermined carbonization chamber to a suction main.

[Explanation of symbols]

A Furnace group 1 Coking chamber 1a, 1b, ..., 1h Coking chamber 2 Coal charging hole 2a Coal charging hole lid 3 Rise pipe 3a, 3b, ..., 3h Rise pipe 4 Curved pipe 41, 42, ... .., 48 Curved pipe 4a Edge cut damper 4a _1, 4a _2, 4a _3, ... _, 4a ₈ Edge cut damper 5 Dry main 6 Pressure regulating valve 7 Piping duct 8 Suction main 9 Water injection nozzle 10 3-way electromagnetic Valve 11 Low-pressure water supply pipe 12 High-pressure water supply pipe 13 Pressure gauge 14 Valve opening regulator 15 Main processing unit 16 Coal powered vehicle 16a Radio transmitter 17 Operation room 17a Radio receiver 18 Blower 19 Combustion chamber 19a, 19b,. .., 19i Combustion chamber

──────────────────────────────────────────────────続 き Continued on the front page (72) Reiko Uchi, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Ken-ichiro Tadokoro 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Steel Tube Co., Ltd. (72) Inventor Hiroaki Shirai 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Tube Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) C10B 27/00

Claims (3)

(57) [Claims] 1. A coke oven group comprising a plurality of coking chambers and a plurality of combustion chambers, wherein each of the combustion chambers is disposed adjacent to each of the coking chambers, and a refractory space is provided between the coking chamber and the combustion chambers. Partitioned by brick walls, each of the carbonization chambers is connected to a header tubular dry main via a rising pipe and then a curved pipe, the dry main is connected to a suction main, and the suction main is suctioned by a blower, while A water injection nozzle is installed inside the curved pipe, an edge damper is installed at the outlet of the curved pipe, and a pressure regulating valve is provided in a pipe duct connecting the dry main and the suction main. In the operation of the coke oven in which the coal is charged into the coking chamber after the kiln is removed, there are at least the following three steps: the beveling between the curved pipe and the dry main. Opening the damper , injecting a high-pressure water spray from the water injection nozzle,
The time when the inside of the dry main body and the outside air of the carbonization chamber start to open through the step of opening the coal charging hole of the carbonization chamber is defined as time 0 (zero),
Of the (zero) from the following (a) to (c) command: the opening of the case from (i) a time 0 to a first predetermined time t _1, the time 0 (zero) the opening degree of the pressure regulating valve (B) From the first predetermined time t ₁ to the second predetermined time t ₂ , the opening of the pressure regulating valve is increased by a _first predetermined opening Δk ₁ , and then (C) reducing the opening of the pressure regulating valve by a second predetermined opening amount Δk ₂ from the _second predetermined time t ₂ to the third predetermined time t ₃ , provided that the second predetermined time Opening amount Δk ₂
Transmitting a command including a value smaller than the first predetermined opening amount Δk ₁ to the pressure regulating valve to feed-forward control the pressure in the dry main, wherein Black smoke emission prevention method. 2. The values of the first predetermined time t ₁ , the second predetermined time t ₂ , and the third predetermined time t ₃ are:
The method for preventing black smoke emission from a coke oven according to claim 1, wherein the method is determined according to a distance between the carbonization chamber and the pressure regulating valve. 3. The first predetermined opening amount Δk ₁ ,
The value of the second predetermined opening amount Δk ₂ is determined based on a relationship between an opening degree of the pressure regulating valve and a flow rate of a gas passing through the pressure regulating valve. 3. The method for preventing black smoke emission from a coke oven according to 2.