JP3956727B2 - Method and apparatus for releasing coal gas from coke oven riser - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for releasing coal gas from a coke oven riser pipe, and more particularly, in coal gas released from the coke oven at the end of the dry distillation of coal into the atmosphere by opening the lid of the riser pipe. The present invention relates to a technique for promoting the combustion of unburned gas and reducing the concentration of hydrocarbons contained in the released gas.
[0002]
[Prior art]
A coke oven is a facility that transfers the heat of combustion exhaust gas generated in a combustion chamber adjacent to the carbonization chamber to the coal charged in a closed carbonization chamber through the furnace wall bricks, and dry-coalizes the coal to coke. is there. FIG. 2 schematically shows the inside of the carbonization chamber 0 during coal carbonization. At the time of dry distillation of the coal 1, the volatile components in the coal 1 are released as the coal gas 2, and the coal gas 2 is dried from the upper part of the coal bed 1 through the riser 3 through the riser 3 as indicated by an arrow fa in FIG. It is sent to a kind of gas reservoir) and recovered for use in various applications. The amount and composition of the coal gas 2 is changed as the carbonization proceeds. At the end of dry distillation, the amount of generated gas is reduced and the main component is almost hydrogen and gas calorie is reduced. Worth to be lost.
[0003]
Further, before extruding the coke after dry distillation from the carbonization chamber 0, it is necessary to burn and remove the carbon 5 adhering to the periphery of the coal charging hole 8 in the carbonization chamber 0 and the upper part of the furnace wall. As shown in FIG. 2, at the end of the coal dry distillation, the lid 6 (also referred to as a top cover) of the riser 3 is opened, and the connection with the dry main 4 side is shut off by the valve 7, A draft air flow (arrow fb) is created from the charging hole 8 to the ascending pipe 3 to perform carbon baking. This carbon burning not only burns the above-mentioned carbon 5 attached to the furnace, but also burns gases such as hydrocarbons generated from coal at the end of dry distillation, and these combustion exhaust gases are released from the riser 3 into the atmosphere. . The combustion exhaust gas discharged from the riser 3 contains unburned coal gas, and therefore, when released above the riser 3, it is burned by contact with the atmosphere to generate a flame 9. To do.
[0004]
[Problems to be solved by the invention]
However, in the method of naturally sucking air from the charging hole 8, the amount of oxygen that can completely burn the generated unburned gas cannot be supplied, and the carbon 5 attached to the charging hole 8 and the upper part of the furnace wall and Since oxygen is also consumed in the coke after the carbonization in the carbonization chamber 0, there is a problem in that sufficient oxygen is not given to the unburned gas in the generated gas and it is diffused to the atmosphere without being able to burn. there were. In addition, when the lid 6 of the riser 3 is opened, a flame 9 is formed above the lid 6. However, in the conventional method of naturally supplying the atmosphere from the periphery of the diffused flow, the flame flows into the surrounding crosswind. Or the flame 9 is disturbed, the emitted gas becomes unburned, and the unburned gas is released into the atmosphere.
[0005]
In view of such circumstances, an object of the present invention is to provide a method and apparatus for releasing coal gas from a coke oven riser that can significantly reduce the amount of unburned gas released into the atmosphere.
[0006]
[Means for Solving the Problems]
The inventor has advanced various studies in order to achieve the above object, and the results have been embodied in the present invention.
[0007]
That is, the present invention relates to a method for opening the cover of the riser pipe of the coke oven at the end of the carbonization period of the coke oven to release the coal gas generated in the carbonization chamber into the atmosphere. From the coke oven riser, characterized in that the auxiliary combustion gas is supplied in a tangential direction at a plurality of positions on the outer periphery of the riser, and the auxiliary combustion gas is applied to the collision plate and swirled along the circumference of the riser This is a coal gas release method.
[0008]
Further, the present invention is a gas injection nozzle that is provided at a plurality of positions on the outer periphery of the tip of the riser pipe that discharges coal gas generated in the coke oven to the atmosphere and supplies auxiliary combustion gas toward the tangential direction of the outer periphery in plan view And a collision plate that collides with the supplied auxiliary combustion gas so as to impart a swirling flow to the coal gas discharged from the riser pipe. It is a discharge device.
[0009]
In the present invention, an auxiliary combustion gas such as air or oxygen is supplied above the lid provided at the tip of the coke oven riser so as to swirl the emitted coal gas. Regardless of the amount of emission, the flame is stable and the flammability of the emitted coal gas is improved. As a result, unburned gas released into the atmosphere is significantly reduced compared to the conventional case.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
First, the inventor observed in detail the situation when coal gas was released from the tip of the coke oven riser pipe. The result is shown in FIG. When the lid 6 of the riser 3 is opened, a flame 9 is formed above the position of the lid 6 (see FIG. 3 (a)), but the atmosphere is naturally supplied from the periphery of the conventional diffused flow. In this method, it is found that the coal gas is unburned and the unburned gas component is released into the atmosphere because it is blown by the surrounding cross wind or the flame 9 is disturbed (see FIG. 3B). It was.
[0011]
Therefore, the inventor swirls the diffused gas above the lid 6 as shown in FIG. 4 (b) as a countermeasure against being blown by the surrounding crosswinds or disturbing the flame 9, and as vertical as possible. We decided to let it release in the direction. Specifically, the auxiliary combustion gas 13 (arrow) such as air or oxygen is positively blown to the side surface of the emitted gas (in the tangential direction of the outer periphery of the rising pipe 3) through the gas injection nozzle 14. This is because the shape of the flame 9 is stabilized and the combustibility of the emitted gas is considered to be improved.
[0012]
However, the amount of coal gas released at the end of coke oven dry distillation is not constant, and the amount generated changes with the time elapsed since the furnace burned down. For this reason, when the momentum of the diffusion gas is smaller than the momentum of the auxiliary combustion gas such as air supplied in the tangential direction of the riser outer periphery, the auxiliary combustion gas 13 penetrates through the emission gas, as shown in FIG. A swollen flame 9 is formed, the flame temperature is lowered, and the combustion reaction rate of the unburned gas is lowered. As a result, it was thought that coal gas was released into the atmosphere without a sufficient combustion reaction.
[0013]
Therefore, the inventor considers that the swirling of the diffused gas needs to be further strengthened in order to stabilize the shape of the flame, and as shown in FIGS. The collision spar 15 that collides with the supplied auxiliary combustion gas 13 and changes its flow is provided. As a result, the auxiliary combustion gas 13 does not penetrate through the diffused gas and promotes its turning. That is, even if the amount of the emitted gas changes, a flame 9 having a stable shape is formed, and the combustibility of the emitted gas is improved and the amount of the unburned gas component released into the atmosphere is reduced. .
[0014]
Further, when the collision plate 15 is not provided, at least six gas injection nozzles 14 for supplying the auxiliary combustion gas 13 are required on the outer periphery of the rising pipe 3, but the collision plate 15 is provided according to the present invention. It was also found that the installation of three gas injection nozzles 14 and the collision plate 15 is sufficient when the swirling of the emitted gas is enhanced. Therefore, according to the present invention, the number of nozzles 14 can be reduced, and the occurrence of nozzle clogging or the like can be reduced as compared with the conventional case.
[0015]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the drawings.
[0016]
1A and 1B are a cross-sectional view and a plan view, respectively, showing an embodiment of the present invention.
[0017]
As is clear from these drawings, the coal gas releasing apparatus according to the present invention is provided with auxiliary combustion gas (air, air) around the water seal 12 provided at the tip of the rising pipe 3 of a coke oven (not shown). A gas header 16 for supplying 13) is attached, and a plurality of gas injection nozzles 14 are provided on the header 16. And the front-end | tip of this gas injection nozzle 14 is orient | assigned to the tangential direction of the diffused gas from the riser 3 by planar view, as shown to Fig.1 (a). The gas header 16 is supplied with compressed air from the compressor 10 via the electromagnetic valve 11. Further, a collision plate 15 having an arc shape concentric with the circumference of the ascending pipe 3 in a plan view is installed at a point where the auxiliary combustion gas is injected.
[0018]
The release method using such a coal gas release device is as follows.
[0019]
First, when the dry distillation of coal is completed in the coke oven carbonization chamber, the lid 6 of the riser 3 is opened at the same time as the carbon 5 adhering to the charging hole 8 and the furnace wall shown in FIG. The electromagnetic valve 11 is opened, high-pressure air is supplied from the compressor 10 to the gas header 16, and is injected from the gas injection nozzle 14 to the emitted gas.
[0020]
As a result, the flame 9 formed above the ascending pipe 3 became a normal swirl flow and was stably maintained even when there was a cross wind. Moreover, the length of the flame 9 was also shortened to about 1/2 of the conventional one, and a good flame was formed. Furthermore, with the conventional method of simply opening the charging hole 8 and the lid 6 at the tip of the riser 3, the concentration of hydrocarbon gas in the emitted gas measured at a position 4 m above the water seal 12 is 320 mg / m ³ ( However, according to the above-described release method of the present invention, the concentration of the hydrocarbon gas could be reduced to 60 mg / m ³ (standard state) and could be reduced to about 1/5.
[0021]
【The invention's effect】
As described above, according to the present invention, when the gas generated in the carbonization chamber is released into the atmosphere by opening the lid of the riser pipe at the end of the carbonization of the coke oven, the amount of unburned gas released into the atmosphere is reduced. It will be much less than before.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing an apparatus for discharging coal gas from a coke oven riser according to the present invention, wherein (a) is a transverse section and (b) is a plane.
FIG. 2 is a cross-sectional view showing a general coke oven.
FIGS. 3A and 3B are diagrams showing a flame caused by combustion of coal gas discharged from a coke oven riser, in which FIG. 3A shows a normal flame, and FIG. 3B shows a flame disturbed by the influence of cross wind.
FIG. 4 is a diagram showing the result of observing a flame of coal gas released from a coke oven riser based on the present invention, where (a) shows no swirling of coal gas, and (b) shows swirling. When appropriate, (c) is the case of excessive supply of auxiliary combustion gas.
[Explanation of symbols]
0 Coking chamber 1 Coal 2 Coal gas 3 Rising pipe 4 Dry main 5 Carbon 6 Lid 7 Valve 8 Coal charging hole 9 Flame 10 Compressor 11 Electromagnetic valve 12 Water seal 13 Gas assist nozzle 14 Gas injection nozzle 15 Collision plate 16 Gas header

Claims (2)

At the end of coal coking in the coke oven, the cover of the riser pipe of the coke oven is opened to release the coal gas generated in the carbonization chamber into the atmosphere.
In the plan view of the tip of the riser, the auxiliary gas is supplied in a tangential direction at a plurality of positions on the outer circumference of the riser, and the auxiliary gas is applied to the collision plate and swung along the circumference of the riser A method for releasing coal gas from a coke oven riser. A gas injection nozzle that is provided at a plurality of positions on the outer periphery of the tip of the riser that discharges the coal gas generated in the coke oven to the atmosphere, and that supplies auxiliary combustion gas toward the tangential direction of the outer periphery in plan view; and from the riser An apparatus for discharging coal gas from a coke oven riser, comprising: a collision plate that collides with the supplied auxiliary combustion gas so as to impart a swirling flow to the discharged coal gas.

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