JPH09221675A - Dry fire extinguish for coke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for dry fire extinguishing cokes not uselessly consuming cokes in a red hot state and capable of effectively recovering a sensible heat of an exhaust gas of a combustion by completely burning a combustible gas in a high temperature gas. SOLUTION: This method for dry extinguishing cokes is to blow a cooling gas into a cooling chamber 13 to which cokes 22 in a red hot state are supplied continuously, for cooling the cokes 22, supply an air to a high temperature gas containing a combustible gas and exhausted from the cooling chamber 13, and transfer the high temperature gas to the end point of oxidation thereof by contacting the gas with a catalyst accelerating the oxidation of the combustible gas. The exhaust gas of the combustion attaining a high temperature is sent to a heat exchanger 17 and a sensible heat of the exhaust gas is recovered and cooled exhaust gas is used as the cooling gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coke dry fire extinguishing method, and more particularly to a coke dry fire extinguishing method in which unburned gas in a cooling gas is completely combusted and sensible heat of the combustion exhaust gas is recovered by a heat exchanger. Regarding the method.

[0002]

2. Description of the Related Art A coke dry fire extinguishing method is one in which a coke discharged from a coke oven is put into a cooling chamber and a cooling gas containing an inert gas such as nitrogen is supplied to the cooling chamber. The present invention achieves the two purposes of extinguishing and cooling the fuel and recovering the sensible heat of the high temperature gas discharged from the cooling chamber by the boiler. Then, the cooled coke discharged from the cooling chamber is charged into the blast furnace. That is, it is charged into a blast furnace and used as a fuel for heating and reducing the temperature of the sinter.

In order to improve the efficiency of sensible heat recovery in such a coke dry fire extinguishing method, JP-A-60-
No. 90291 discloses a method for making the coke temperature distribution in the cooling tower uniform and increasing the amount of recovered heat by adding water or steam to the circulating gas path from the waste heat recovery boiler to the cooling tower. Is proposed. Further, JP-A-59-75981 discloses a coke dry extinguishing method in which red gas coke is cooled by a cooling gas, and a cooling gas in which water is added to at least one of air and nitrogen is reacted with red hot coke. To generate a gas containing a large amount of hydrogen (H ₂ ) and carbon monoxide (CO), combine the generated gas with a heated high temperature gas of a cooling gas, and burn the gas to recover the sensible heat. Describes a method for effectively recovering sensible heat of high temperature gas. Also,
JP-A-60-123592 discloses that the coke produced in a coke oven remains in a red hot state or is cooled once, and then put into a coke dry fire extinguisher facility to obtain oxygen gas, air,
A gasifying agent such as water (H ₂ O) is blown into the coke dry fire extinguishing equipment from above or below via a blower (blower), and the sensible heat of the generated high temperature gas is recovered by the boiler, and the gas after recovery of the sensible heat A method of circulating a part of the above as a cooling gas to a coke dry fire extinguishing equipment by a blower (blower) is described.

[0004]

However, the above-mentioned JP-A-60-90291 and JP-A-59-75981.
In the method described in JP-A No. 60-123592 and JP-A No. 60-123592, water or steam is added to the cooling gas to homogenize the coke temperature distribution in the cooling tower and increase the amount of recovered heat. In order to completely burn combustible gas such as carbon monoxide and hydrogen contained in the cooling gas, it is necessary to introduce more than the theoretical air amount required for combustion into the circulating gas, and excess oxygen is the cooling gas. At the same time, there was a drawback that it entered the cooling chamber and burned the coke that was the product. Also, in order to prevent this, if the amount of air supplied is reduced to an amount less than the theoretical amount of air, the combustible gas in the cooling gas remains unburned and is released to the outside. There was a problem that became.
The present invention has been made in view of such circumstances, without consuming and oxidizing the red hot coke thrown into the cooling chamber in vain, and by completely burning the combustible gas in the high temperature gas, An object of the present invention is to provide a coke dry fire extinguishing method capable of efficiently recovering the sensible heat of the combustion exhaust gas.

[0005]

According to the present invention, there is provided a semiconductor device comprising:
The coke dry extinguishing method described is a cooling chamber in which coke in a red hot state generated in a coke oven is continuously supplied with a cooling gas to cool the coke, and a combustible gas discharged from the cooling chamber. After supplying air to the hot gas containing the characteristic gas,
The hot gas is transferred to the end point of the oxidation reaction by bringing it into contact with a catalyst that promotes the oxidation of the combustible gas, and the flue gas having a higher temperature is sent to a heat exchanger to recover the sensible heat of the flue gas. Then, the cooled combustion exhaust gas is used as the cooling gas. The coke dry fire extinguishing method according to claim 2 is the coke dry fire extinguishing method according to claim 1, wherein the concentrations of oxygen and carbon monoxide contained in the combustion exhaust gas are measured, and the concentration of the oxygen gas is an oxygen standard concentration. When it exceeds, the amount of air supplied to the high temperature gas is reduced by a unit amount and the amount of air is maintained for a predetermined time, and when the concentration of the carbon monoxide gas exceeds the carbon monoxide standard concentration, it is supplied to the high temperature gas. The amount of air to be generated is increased by a unit amount and the amount of air is held for a predetermined time.

The red hot coke means coke having a temperature of at least 900 ° C. or higher after being discharged from the coke oven. The cooling chamber continuously discharges coke in the red hot state charged from the upper part from the lower part continuously, and extinguishes and cools the coke in the red hot state by the cooling gas of the flow facing the downward direction of the coke during that time. It is a device that does. The flammable gas is a hydrocarbon, carbon monoxide, a thermal decomposition component of coke such as hydrogen, and a gas species such as carbon monoxide and hydrogen produced by the reaction between coke and water in the cooling gas, and oxygen. It means a component capable of binding and performing an oxidation reaction. The catalyst is a reaction catalyst that participates in the oxidation reaction between oxygen in the air supplied to the high temperature gas and the flammable gas, and palladium, platinum, silver, vanadium pentoxide, or the like can be used. The heat exchanger is a heat exchanger that heats the water in the water pipe by the sensible heat of the high temperature combustion exhaust gas supplied from the combustion chamber while cooling the combustion exhaust gas.
The combustion chamber is provided between the cooling chamber and the heat exchanger, and is usually called a dust catcher. It collects dust in the high temperature gas, and combustibles contained in the high temperature gas discharged from the cooling chamber. Sexual gas,
It is a device that burns with oxygen in the air supplied to the combustion chamber or cooling chamber. What is the oxygen reference concentration?
It is a control value that is the upper limit of the oxygen gas concentration in the cooling gas, and if the oxygen concentration is below the oxygen reference concentration, it means that the oxidation of the coke by the cooling gas is at a level that is actually acceptable. Based on this, it can be set appropriately. The carbon monoxide reference concentration is a control value that is the upper limit of the carbon monoxide gas concentration in the cooling gas, and if the carbon monoxide concentration is equal to or lower than the carbon monoxide reference concentration, the carbon monoxide concentration in the cooling gas at the time of releasing the cooling gas It represents an acceptable level of flammable gas loss. The predetermined time is the time required for the effect of the change to be reflected in the oxygen concentration or carbon monoxide concentration of the combustion exhaust gas discharged from the heat exchanger when the amount of air supplied to the high temperature gas is changed. Yes, it is the time determined by the specifications of equipment capacity such as gas flow rate in coke dry fire extinguishing equipment.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. Here, FIG. 1 is a schematic explanatory view of a coke dry fire extinguishing equipment 10 to which a coke dry fire extinguishing method according to a first embodiment of the present invention is applied. The coke dry fire extinguishing equipment 10 includes a pre-chamber 12 into which a coke 22 discharged from a coke oven (not shown) is charged, a cooling chamber 13 provided below the pre-chamber 12 to cool the coke 22 with a cooling gas, and a cooling gas. Blower 18 for blowing air into the cooling chamber 13
And a combustion chamber 15 for burning the high temperature gas discharged from the upper part of the cooling chamber 13 with oxygen in the air,
Catalyst layer 1 for oxidizing combustible gas in high temperature gas after combustion
6, a boiler 17 that is an example of a heat exchanger that heats steam or water in piping by sensible heat of combustion exhaust gas in which high-temperature gas is oxidized, and a coke 22 that is discharged from the lower part of the cooling chamber 13 to a blast furnace factory or the like. And a belt conveyor 20 for transportation.

The air supply amount control valve 26 for supplying the air from the air supply device (not shown) to the upper part of the cooling chamber 13 and the high temperature gas between the upper part of the cooling chamber 13 and the combustion chamber 15 has a cooling chamber. It is provided near the upper part of 13. Further, a combustion exhaust gas emission control valve 28 for releasing a part of the combustion exhaust gas into the atmosphere via a dust collection processing device or the like (not shown) between the blower portion 14 of the cooling gas and the blower 18 under the cooling chamber 13. Are provided as needed, and the combustion exhaust gas discharge amount control valve 28 can be opened and closed by a control signal from the control device 21. In addition,
Air supply amount control valve 26 and combustion exhaust gas discharge amount control valve 2
8 can take a plurality of opening positions in stages. In addition, blower 18 and boiler 1
A carbon monoxide densitometer 25 for measuring the concentrations of carbon monoxide and oxygen in the combustion exhaust gas and an oxygen densitometer 24 are arranged between 7 and 7, respectively. The value of is taken into the control device 21. Further, a flow meter 29 for measuring the flow rate of the cooling gas supplied to the cooling chamber 13 is provided between the combustion exhaust gas discharge amount control valve 28 and the blowing section 14.
Is provided so that the flow rate of the cooling gas can be constantly monitored. The catalyst layer 16 is palladium (Pd)
Is used as a catalyst, and this is coated on an alumina catalyst carrier, and this catalyst carrier is disposed in the flow path between the combustion chamber 15 and the boiler 17. Other catalysts include, for example, platinum (Pt), silver (Ag), vanadium pentoxide (V
₂ O ₅ ) or the like can be used, and titania, activated carbon or the like can also be used as the catalyst carrier. Cooling chamber 13
Has a coke 22 having a substantially cylindrical inner wall.
The cooling device has a capacity of 00 tons, and the cooled coke 22 is provided at the lower part thereof at a predetermined cutting speed, in this case, 1
Cutting device 19 capable of discharging at 00 tons / H
Is provided. The residence time in the cooling chamber 13 until the coke 22 charged through the prechamber 12 is discharged from the lower part of the cooling chamber 13 is set to about 2 to 3 hours. The flow rate of the cooling gas blown into the cooling chamber 13 is maintained at a level of about 150,000 Nm ³ / H by driving the blower 18.

Subsequently, the coke dry fire extinguishing equipment 10 described above is used.
The coke dry-type fire extinguishing method according to the first embodiment of the present invention will be described in detail. Pre chamber 12
Temperature is 950-1000.
The coke 22 at 0 ° C. is cooled to 200 ° C. or lower by exchanging heat with the cooling gas having a low temperature that rises in the cooling chamber 13 during the 2-3 hours in which the coke 22 descends. Then, the volatile matter in the coke 22 is generated as a combustible gas by thermal decomposition, and a trace amount of water in the cooling gas and the coke 22 undergo a water gasification reaction to generate hydrogen,
It also generates carbon monoxide gas.

Next, the cooling gas containing hydrogen and carbon monoxide produced by the gasification reaction of the coke 22 in the cooling chamber 13 rises in the cooling chamber 13 while further cooling the high temperature coke 22. Finally, high temperature gas is discharged from the upper part of the cooling chamber 13. Here, it is also possible to preliminarily enrich oxygen in the hot gas by blowing air from the upper part of the cooling chamber 13 through the air supply amount control valve 26. At this time, hydrogen gas, carbon monoxide gas, generated by the gasification reaction of the coke 22 in the high temperature gas,
Other combustible gases, carbon dioxide gas, and oxygen gas, nitrogen gas, water content, etc. derived from the supplied air are included.

Then, after the air supply amount control valve 26 is opened and closed to blow a predetermined amount of air into the high temperature gas whose temperature is 900 to 980 ° C. discharged from the upper portion of the cooling chamber 13, this high temperature gas is discharged. Combustion is performed in the combustion chamber 15 which also functions as a dust remover in the air flow. As a result, the combustible gas in the high-temperature gas burns, the temperature of the combustion exhaust gas rises by about 30 ° C., and the amount of water and carbon dioxide in the high-temperature gas is changed by burning hydrogen gas and carbon monoxide gas. increase. However, since the above combustion reaction (oxidation reaction) is performed under the condition that a large amount of gas is processed at a high flow rate, the reaction is not completed, and an unreacted state in which flammable gas such as carbon monoxide and oxygen coexist. Will remain. When the combustion exhaust gas containing the unreacted combustible gas and oxygen is supplied again to the cooling chamber 13 as the cooling gas, the latent sensible heat of the high temperature gas can be efficiently recovered. In addition, since it is not possible to accurately grasp the theoretical air amount required to burn combustible gas,
This makes it difficult to accurately control the amount of air supplied to the high temperature gas.

In the coke dry fire extinguishing method according to the first embodiment of the present invention, a catalyst layer 16 having palladium (Pd) as a catalyst is provided between the combustion chamber 15 also serving as a dust remover and the boiler 17. As a result, the oxidation reaction between the combustible gas such as carbon monoxide and oxygen in the combustion exhaust gas can be transferred to the end point of the reaction, and the combustible gas in the combustion exhaust gas can be efficiently burned. While you can
It enables accurate control of the amount of air blown into the hot gas.
After the combustion exhaust gas passes through the catalyst layer 16, when the amount of air supplied to the high temperature gas is larger than the theoretical amount of air, the amount of combustible gas components becomes substantially zero, and excess oxygen remains. Become. On the contrary, when the amount of air supplied to the high temperature gas is less than the theoretical amount of air, the oxygen concentration becomes substantially zero, and the flammable gas remains. Therefore, by providing the catalyst layer 16, the state of the combustion exhaust gas can be positioned in any one of the above states, so that the amount of air supplied to the high temperature gas can be easily controlled.

The control method for efficiently burning and oxidizing the combustible gas in the high temperature gas under the condition of the air amount near the theoretical air amount will be described in detail below with reference to FIGS. 1 and 2. FIGS. 2A and 2B are explanatory diagrams showing changes over time in the concentrations of oxygen and carbon monoxide measured by the oxygen concentration meter 24 and the carbon monoxide concentration meter 25, respectively. At time t ₁ shown in the figure, the value of the oxygen concentration exceeds the oxygen reference concentration of 0.1%, and the carbon monoxide concentration is 0.05% or less of the carbon monoxide reference concentration. Here, the opening position of the air supply amount control valve 26 is rotated in the direction to close it by one step to decrease the air amount by a unit amount. Then, at time t ₂ = t ₁ + Δt after the lapse of a predetermined time (Δt),
The oxygen concentration and the carbon monoxide concentration are measured again. Since the oxygen concentration at this time is still higher than the oxygen reference concentration (0.1%), an operation for further reducing the air amount by a unit amount is performed. At t ₃ after the lapse of the following predetermined time (Δt),
The oxygen concentration becomes lower than the oxygen reference concentration (0.1%), and the value of the carbon monoxide concentration also changes to the carbon monoxide reference concentration (0.0
5%), the opening position of the air supply amount control valve 26 at this time is maintained in this state. In this manner, the time t _3, also in t _4, after holding the opening position of the air supply control valve 26, at time t _5, the value of carbon monoxide reference concentration of carbon monoxide concentration (0. Since the level of the air supply control valve 26 has exceeded the level of (05%), the opening position of the air supply amount control valve 26 is opened by one step, and the amount of air supplied to the high temperature gas is increased by a unit amount. Then, at time t ₆ , the carbon monoxide concentration is still higher than the carbon monoxide reference concentration, so the air amount is further increased by a unit amount. As a result of gradually increasing the air amount in this way, the air amount in the high-temperature gas exceeds the theoretical air amount, and at time t ₇ , both the oxygen concentration and the carbon monoxide concentration are in the range below the reference value. The dry fire extinguishing facility 10 can be operated. Therefore, by continuing such an operation, stable gas circulation of the coke dry fire extinguishing equipment 10 at an air amount close to the theoretical air amount becomes possible, and the oxygen reference concentration and the carbon monoxide reference concentration are within the upper limits, Coke dry fire extinguishing equipment 10
Can be operated.

Incidentally, such control is performed by the oxygen concentration meter 24
Also, the above-described calculation is performed by the control device 21 that takes in the signal from the carbon monoxide concentration meter 25, and based on the result, the air supply amount control valve 26 can be automatically operated without human intervention. . Then, the combustion exhaust gas heated as described above and having its gas composition changed from the high temperature gas is taken into the boiler 17 and heat-exchanged with the cooling water supplied through the water pipe of the boiler 17, etc. The cooling water can be heated by heat to obtain high-temperature steam.

Then, the combustion exhaust gas discharged from the boiler 17 is collected as a low-temperature cooling gas. If necessary, the amount of water in the combustion exhaust gas is measured, pressurized by the blower 18, and returned to the lower portion of the cooling chamber 13 as a cooling gas at a flow rate of about 150,000 Nm ³ / H. It has become.

On the other hand, at this time, when the flow rate of the cooling gas exceeds a predetermined range due to the increase of combustion exhaust gas,
For example, the combustion exhaust gas emission amount control valve 28 provided between the blower 18 and the cooling chamber 13 can be opened to release a part of the combustion exhaust gas into the outside air for adjustment.
In this way, the flow rate of the cooling gas circulating in the coke dry fire extinguishing equipment 10 is maintained at a predetermined value, for example, 150,000 Nm ³ / H by changing the supply amount of the air introduced into the high temperature gas, and the cooling is performed. The amount of air in the high temperature gas discharged from the chamber 13 can be controlled to be close to the theoretical amount of air required to completely burn the combustible gas. Further, the operation of the above process can be automatically performed through the control device 21. That is, the respective output signals from the oxygen concentration meter 24 and the carbon monoxide concentration meter 25 arranged between the boiler 17 and the cooling chamber 13 are input to the control device 21, and the data of these output signals are input to the control device 21. It is possible to control the air supply amount control valve 26 by deciding an operation for controlling the air supply amount control valve 26 or a holding operation according to the above-described control algorithm incorporated in advance.

Then, the air controlled to the theoretical air amount as described above is supplied to the high temperature gas through the air supply amount control valve 26. The cooling gas at this time is discharged from the lower part of the cooling chamber 13 to about 200
While coming into contact with the coke 22 cooled to ℃, the cooling gas rises in the cooling chamber 13, the cooling gas cools the coke 22 in the red hot state, and at the same time, it is heated to a high temperature gas of 900 ° C. or higher. Then, it is discharged from the upper part of the cooling chamber 13.

Table 1 shows the air supply control valve 26 as described above.
2 is a summary of the conditions and results of the coke dry fire extinguishing method according to the first embodiment of the present invention for controlling the above.

[0019]

[Table 1]

As shown in Table 1, in the present embodiment, both the carbon monoxide concentration and the oxygen concentration in the cooling gas supplied to the cooling chamber 13 become substantially zero (carbon monoxide concentration ≦ 0). 0.05%, oxygen concentration ≤
0.1%), the oxidation of the coke 22 due to the cooling gas is prevented, and the coke consumption (oxidation loss due to the oxygen content in the cooling gas) is substantially zero. Further, even when such a cooling gas is released into the atmosphere, the loss of combustible gas containing carbon monoxide can be avoided. Incidentally, the catalyst layer 1 that does not control the air supply control valve 26 as described above and oxidizes the combustible gas
In the conventional example in which 6 is not provided, as shown in Table 1, the carbon monoxide concentration and the oxygen concentration are 0.1%,
Coke consumption is 1t / H due to the level of 1%
It can be seen that the loss of the combustible gas becomes large when the cooling gas is released. The coke strength (DI) in the table indicates the proportion of coke grains that remain unbroken when cooled coke grains having a predetermined grain size are dropped from a predetermined distance.

Next, a coke dry fire extinguishing method according to a second embodiment of the present invention will be described with reference to the explanatory view of the coke dry fire extinguishing equipment 11 shown in FIG. FIG. 3 is a schematic explanatory diagram of the coke dry fire extinguishing equipment 11 to which the coke dry fire extinguishing method according to the second embodiment of the present invention is applied. The coke dry fire extinguishing equipment 11 has basically the same configuration as the coke dry fire extinguishing equipment 10 in the first embodiment shown in FIG. 1, but supplies water to the cooling gas between the blower 18 and the cooling chamber 13. Is provided with a water supply amount control valve 27 and a combustion exhaust gas discharge amount control valve 28 for discharging excess combustion exhaust gas to the atmosphere, and is discharged from the boiler 17 between the boiler 17 and the blower 18. The difference is that a moisture meter 23 for detecting the moisture of the combustion exhaust gas is provided. In the following,
Regarding each part whose function is the same as that of the first embodiment,
The same reference numerals as those in FIG. 1 are used and the description thereof is omitted. The water supply amount control valve 27 and the combustion exhaust gas discharge amount control valve 28 are both adapted to take a required opening position by a control signal from the control device 21.

Next, a coke dry fire extinguishing method according to a second embodiment of the present invention will be described using the coke dry fire extinguishing equipment 11 described above. The coke 22 having a temperature of 950 to 1000 ° C. continuously charged through the pre-chamber 12 descends in the cooling chamber 13 and rises in the cooling chamber 13 during the low cooling. It exchanges heat with gas and is cooled to 200 ° C or lower. During this time, the active fine coke having a large specific surface area in the coke 22 selectively reacts with the water in the cooling gas to generate water gas (carbon monoxide and hydrogen gas). Since such a water gasification reaction is an endothermic reaction, the coke 22 can be cooled more effectively.

As described above, the cooling gas containing hydrogen and carbon monoxide produced by the water gasification reaction in the cooling chamber 13 rises in the cooling chamber 13 while further cooling the high temperature coke 22. Finally, high temperature gas is discharged from the upper part of the cooling chamber 13. Here, air can be blown from the air supply amount control valve 26 above the cooling chamber 13 to enrich oxygen in the high temperature gas in advance. At this time, the high-temperature gas contains hydrogen gas and carbon monoxide gas components produced by the water gasification reaction, as well as oxygen gas, nitrogen gas, moisture, and combustible gas components produced by volatilization of coke 22. Has been. The temperature discharged from the upper part of the cooling chamber 13 is 900 to 980 ° C.
After the air supply amount control valve 26 is opened and closed to blow the predetermined amount of air into the high temperature gas, the high temperature gas is burned in the combustion chamber 15. As a result, the combustible gas in the high temperature gas burns, the temperature of the combustion exhaust gas rises by about 30 ° C., and the amount of water and carbon dioxide in the high temperature gas increases due to the combustion reaction of hydrogen gas, CO gas, etc. But
Since the combustion reaction (oxidation reaction) is carried out under the condition that a large amount of gas is processed at a high flow rate, the reaction is not completed and remains in an unreacted state in which flammable gas such as carbon monoxide and oxygen coexist. Become. Therefore, if the combustion exhaust gas containing the unreacted combustible gas and oxygen is supplied again to the cooling chamber 13 as the cooling gas, the latent sensible heat of the high temperature gas is completely removed. It is difficult to accurately control the amount of air supplied to the high temperature gas because it cannot be recovered and the theoretical amount of air required to burn combustible gas cannot be accurately grasped. In addition to the above, the coke is oxidized by oxygen in the cooling gas and the production amount of coke is reduced.

In the coke dry-type fire extinguishing method according to the second embodiment of the present invention, the catalyst layer 16 having palladium (Pd) as a catalyst is provided between the combustion chamber 15 and the boiler 17, so that the combustion exhaust gas contains It is possible to transfer the oxidation reaction of a certain combustible gas such as carbon monoxide and hydrogen with oxygen to the end point of the reaction, and efficiently combust the combustible gas containing carbon monoxide and hydrogen in the combustion exhaust gas. . Next, the combustion exhaust gas that has been heated as described above and whose gas composition has changed from the high temperature gas is taken into the boiler 17 and the boiler 1
By exchanging heat with the cooling water supplied through the water pipe 7 or the like, the cooling water can be heated by the sensible heat to obtain high-temperature steam.

The combustion exhaust gas discharged from the boiler 17 is recovered as a low-temperature cooling gas, and the cooling gas is pressurized by the blower 18 after measuring its water content by the water content meter 23 to obtain about 15 It is returned to the lower part of the cooling chamber 13 at a flow rate of 10,000 Nm ³ / H. At this time, the amount of water in the cooling gas is measured, and when the amount of water is lower than a predetermined amount, the water supply amount control valve 27 provided between the blower 18 and the cooling chamber 13 is opened / closed to obtain the required amount of water. To supply water to the cooling gas. That is, the opening position of the water supply amount control valve 27 is increased by one step, and this state is maintained for a predetermined transition time, and the water content measured by the water content meter 23 is still less than a predetermined amount, for example, 5% by volume. If not, the opening position is further increased by one step. In this way, the above-mentioned operation can be executed until the water content reaches the predetermined 5% by volume or more. Further, when the water content exceeds, for example, a predetermined 30% by volume, the opening position of the water supply amount control valve 27 is decreased step by step as described above. By the above operation, the water content measured by the water content meter 23 can be maintained within a predetermined range of 5 to 30% by volume. On the other hand, at this time, when the flow rate of the cooling gas exceeds a predetermined range due to an increase in the combustion exhaust gas, for example, the combustion exhaust gas emission control valve 28 provided between the blower 18 and the cooling chamber 13 is opened, The flow rate of the cooling gas can be adjusted by discharging a part of the combustion exhaust gas into the outside air or by closing the air supply amount control valve 26.

Incidentally, in parallel with the control of the water supply amount based on the water amount, the high temperature gas is measured on the basis of the measured values of the carbon monoxide concentration and the oxygen concentration as in the first embodiment. It is also possible to control the air supply amount so as to be close to the theoretical air amount required to burn the combustible gas therein. In this way, the flow rate of the cooling gas circulated in the coke dry fire extinguishing equipment 11 is maintained at a predetermined value, for example, 150,000 Nm ³ / H by changing the supply amount of the air introduced into the high temperature gas, and the cooling is performed. It is possible to efficiently oxidize carbon monoxide and hydrogen gas generated by the water supplied to the chamber 13 and effectively recover the sensible heat of the combustion exhaust gas. Further, the operation of the above process can be automatically performed through the control device 21.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments, and all changes in conditions without departing from the gist are within the scope of the present invention. For example, in the present embodiment, the air blown into the high temperature gas is supplied to the upper part of the cooling chamber 13, and the upper part of the cooling chamber 13 and the combustion chamber 15.
The supply is made at two points in between, but only one of them may be provided. Further, the air supply amount control valve 26 can be manually operated independently without using the control device 21.

[0028]

In the coke dry-type fire extinguishing method according to the first and second aspects of the present invention, a catalyst for promoting the oxidation of the combustible gas after air is supplied to the high temperature gas containing the combustible gas discharged from the cooling chamber. Since the carbon monoxide and hydrogen are transferred to the end point of the oxidation reaction by bringing them into contact with each other, it is possible to efficiently burn the combustible gas containing carbon monoxide and hydrogen in the combustion exhaust gas, and to reduce the amount of air after that. Control can be performed easily. Particularly, in the coke dry fire extinguishing method according to claim 2,
Based on the measured values of the concentrations of oxygen and carbon monoxide contained in the combustion exhaust gas discharged from the heat exchanger, and the respective reference values, the amount of air supplied to the high temperature gas is increased or decreased,
Combustible gas is burned at the level of theoretical air volume required to burn combustible gas in high temperature gas, and efficient sensible heat recovery in coke dry extinguishing method and operation with less coke loss due to combustion are performed. be able to.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of coke dry fire extinguishing equipment to which a coke dry fire extinguishing method according to a first embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram of an air amount control method in the coke dry fire extinguishing method.

FIG. 3 is an explanatory diagram of coke dry fire extinguishing equipment to which a coke dry fire extinguishing method according to a second embodiment of the present invention is applied.

[Explanation of symbols]

10 Coke dry fire extinguishing equipment 11 Coke dry fire extinguishing equipment 12 Pre-chamber 13 Cooling chamber 14 Blowing part 15 Combustion chamber 16 Catalyst layer 17 Boiler 18 Blower 19 Cutting device 20 Belt conveyor 21 Control device 22 Coke 23 Moisture meter 24 Oxygen concentration meter 25 Monoxide Carbon concentration meter 26 Air supply amount control valve 27 Moisture supply amount control valve 28 Combustion exhaust gas discharge amount control valve 29 Flow meter

Claims (2)

[Claims] 1. A cooling chamber in which red hot coke generated in a coke oven is continuously supplied,
By blowing a cooling gas to cool the coke and supplying air to a high temperature gas containing a combustible gas discharged from the cooling chamber, the coke is contacted with a catalyst that promotes the oxidation of the combustible gas. To transfer the hot gas to the end point of the oxidation reaction, send the higher temperature combustion exhaust gas to a heat exchanger, recover the sensible heat of the combustion exhaust gas, and use the cooled combustion exhaust gas as the cooling gas. Coke dry fire extinguishing method. 2. The concentration of oxygen and carbon monoxide contained in the combustion exhaust gas is measured, and when the concentration of the oxygen gas exceeds an oxygen reference concentration, the amount of air supplied to the high temperature gas is reduced by a unit amount. Hold the air amount for a predetermined time, and if the concentration of the carbon monoxide gas exceeds the carbon monoxide reference concentration, increase the amount of air supplied to the high temperature gas by a unit amount and hold the air amount for a predetermined time. The coke dry-type fire extinguishing method according to claim 1, wherein