JPH05295367A - Method for removing deposited carbon from coke oven - Google Patents

Abstract

(57) [Summary] [Purpose] The combustion exhaust gas after removal of adhered carbon will not be emitted to the atmosphere. [Structure] An oxygen-containing gas is blown into the burnt carbonization chamber before the kiln is discharged to burn the adhering carbon, and the combustion exhaust gas is mixed with C gas generated from another carbonization chamber and discharged. The oxygen-containing gas blown into the carbonization chamber may be, in addition to air, exhaust gas sucked from the open portion of the device in the C gas purification step. [Effect] Since the combustion exhaust gas is not emitted to the atmosphere, a good working environment is maintained. Further, when the exhaust gas sucked from the open part of the device in the C gas purification process is blown as the oxygen-containing gas, the two processes of removing the hydrocarbons in the exhaust gas and burning and removing the carbon adhering to the carbonization chamber are performed simultaneously. Done and is extremely effective.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing carbon adhering to the upper part of a carbonization chamber of a coke oven.

[0002]

2. Description of the Related Art In the process of carbonizing the coal charged in a carbonization chamber, organic matter in the coal is decomposed and gasified to form C.
Gas (coke oven gas) and coal tar are produced. These by-products are sucked and collected from the upper space of the carbonization chamber, but since the upper space is at a high temperature (800 ° C to 1000 ° C), a part of it is further thermally decomposed while flowing through the upper space. Release fine carbon. Most of this free carbon is discharged to the outside of the furnace together with C gas, but only a very small part thereof adheres to the furnace wall and gradually grows. Then, the adhered carbon narrows the coal charging port and obstructs the flow of gas, which becomes a factor to hinder the operation. Therefore, the operation of the coke oven cannot be continued unless the carbon deposited in the carbonization chamber is regularly removed. Therefore, various techniques related to the removal of adhered carbon have been conventionally proposed.

As a conventional method for removing adhered carbon, there is, for example, a method described in Japanese Patent Laid-Open No. 2-145686. This method is a technique for burning and removing adhered carbon, and the following operation is performed.

[0004] The ascending pipe canopy of the carbonization chamber where the coke has been extruded or the lid of the charging port adjacent to the ascending pipe is opened. Remove one of the furnace lids and replace it with a furnace lid dedicated to carbon combustion.Air is supplied from an air pressure feeding device installed in a train, etc., and air is supplied to the carbonization chamber from the air outlet provided in the furnace lid dedicated to carbon combustion. Blow and burn the attached carbon. The flue gas is diffused into the atmosphere through an open riser or a charging port.

[0005]

However, in the conventional method for removing adhered carbon, since the combustion exhaust gas when the adhered carbon is burned by blowing air into the carbonization chamber is released to the atmosphere, the surrounding atmosphere is polluted. There is a problem that the working environment becomes worse. It is an object of the present invention to provide a method for removing adhered carbon that does not diffuse combustion exhaust gas into the atmosphere.

[0006]

In order to achieve the above object, in the present invention, an oxygen-containing gas is blown into a burning coal combustion chamber to burn carbon adhering to the upper portion of the carbonization chamber, and the combustion is performed. The exhaust gas generated by is mixed with the C gas generated from the other carbonization chamber and discharged. The carbonization chamber into which the oxygen-containing gas is blown is preferably the carbonization chamber in which the kiln is to be discharged next. The oxygen-containing gas blown into the carbonization chamber may be the exhaust gas sucked from the open part of the device in the C gas purification step.

[0007]

In the present invention, before the coke kiln is removed,
Oxygen-containing gas is supplied to the burning carbonization chamber (carbonization chamber at the end of dry distillation where the generation of C gas has ended) to burn the adhering carbon. Therefore, the combustion exhaust gas is mixed with the gas generated from the other carbonization chamber which has not been burnt and is discharged.
In this case, the blowing amount of the oxygen-containing gas does not occupy such a large ratio with respect to the total amount of C gas generated,
Moreover, the oxygen in the blown oxygen-containing gas is consumed by the combustion of the adhering carbon and its concentration is lowered, so that the oxygen concentration in the C gas sent to the gas purification step after being mixed with the combustion exhaust gas is within a predetermined range. Can be fastened.

The oxygen-containing gas blown into the carbonization chamber preferably contains combustible gas such as hydrocarbon and is exhaust gas which requires treatment. As this kind of exhaust gas, for example, there is exhaust gas in the C gas refining process. Since there is an open part in the device for the C gas purification process, and the low boiling point component (mainly hydrocarbon) of the tar component is volatilized from this open part, in order to improve the working environment, suction is performed from the above open part. There is a need.
This exhaust must be treated, but the easiest way to treat it is to burn it. However, since this exhaust gas contains only a trace amount of hydrocarbons and cannot be self-combusted, it must be burned by a special method such as a method of burning through a catalytic oxidation device. Therefore, if such exhaust gas is introduced into the carbonization chamber, two processes, that is, a process for removing hydrocarbons in the exhaust gas (combustion of hydrocarbons) and a process for burning / removing carbon adhering to the carbonization chamber, are carried out simultaneously. , Very effective.

[0009]

1 and 2 are explanatory views of an embodiment of the present invention. FIG. 1 schematically shows a cross section of a carbonization chamber, and a method and a method for blowing air, which is an oxygen-containing gas, into the carbonization chamber. FIG. 2 is a diagram showing a flow of air, and FIG. 2 is a diagram schematically showing a plane of a coke oven, showing a method of blowing air into a plurality of carbonization chambers. 1 and 2, 1 is a coke oven, 2 is a carbonization chamber, 3 is a charging port, 4 is coke at the end of dry distillation, 5 is an ascending pipe for discharging C gas, and 6 is C gas discharged from the ascending pipe. It is a drymen that collects gas and adjusts its suction.

Pipes 9 and 10 for blowing air are connected to the upper part of each carbonization chamber 2 and the lower part of each rising pipe 5, respectively. The pipes 9 and 10 are connected to the pipe 8, and the pipe 8 is connected to the air supply header 7. Further, the pipe 8 is provided with an automatic opening / closing valve 11, and by opening / closing this valve 11, air is introduced into a predetermined carbonization chamber 2 in a predetermined order. 12,
Reference numeral 13 is a valve that switches the air blowing portion, and the air blowing portion that has passed through the automatic opening / closing valve 11 can be switched. By opening or closing these valves 12 and 13 in advance, the supplied air is supplied to the carbonization chamber 2 through the pipe 9.
Is blown into either the upper space or the lower portion (base portion) of the rising pipe 5, or both. The arrows in the carbonization chamber of FIG. 1 indicate the flow of blown air.

Air is blown into the carbonization chamber 2 through the above piping system as follows. First, the air blowing portion of each carbonization chamber 2 is determined, and the valve 12
Alternatively, the valve 13 or both the parts 12 and 13 are left open. When a certain carbonization chamber 2 burns down and the next kiln is started according to the operation schedule, the automatic opening / closing valve 11 opens and air flows through the pipe 9 or the pipe 10 or both pipes. The air flowing through the pipe 9 is blown into the upper space of the carbonization chamber 2 and burns the carbon adhering to the upper part of the carbonization chamber 2 and the wall surface of the rising pipe 5.

The air flowing through the pipe 10 is blown toward the base of the rising pipe 5 to burn the carbon adhering to the rising pipe 5. The exhaust gas obtained by burning the adhered carbon is introduced into the drymen 6 via the rising pipe 5. The combustion exhaust gas introduced into the drymen 6 is used in another carbonization chamber 2
It is mixed with the C gas generated from and is sent to the C gas refining step.

The composition of C gas in the case of the present invention in which air was blown into the carbonization chamber 2 as described above and in the case of the conventional method in which air was not blown were as shown in Table 1. The amount of C gas generated in this operation was 10
At 0,000 Nm ³ / hour, the blowing of air into the carbonization chamber 2 is 100 Nm
^It was done at ³ / hour.

[0014]

[Table 1]

As shown in Table 1, even if air is blown into the carbonization chamber 2, the change in the C gas composition is small. In particular, the increase in O ₂ concentration was small, and it was a value that caused no problem in operation. In addition, in the above-mentioned Example, although the case where the oxygen-containing gas blown into the carbonization chamber was air was described, the present invention is not limited to blowing gas, and as described above, C gas purification Exhaust gas sucked from the open part of the device of the process may be a gas in which the air contains a very small amount of hydrocarbons.

[0016]

According to the present invention, the oxygen-containing gas is blown into the burnt carbonization chamber before the kiln is burned to burn the adhering carbon, and the combustion exhaust gas is mixed with the C gas generated from the other carbonization chamber and discharged. It is a method to let.

According to the present invention, since the combustion exhaust gas is not emitted to the atmosphere, the surrounding atmosphere is not polluted and a good working environment is maintained. In addition, when the oxygen-containing gas blown into the carbonization chamber is exhausted from the open portion of the device in the C gas purification process, there are two processes: a process for removing hydrocarbons in the exhaust and a process for burning and removing carbon adhering to the carbonization chamber. The processing is performed simultaneously and is extremely effective.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment according to the present invention.

FIG. 2 is an explanatory diagram of an embodiment according to the present invention.

[Explanation of symbols]

 1 Coke oven 2 Carbonization chamber 3 Charging port 4 Coke at the end of dry distillation 5 Rise pipe 6 Drymen 7 Air supply header 8, 9, 10 Piping for blowing air 11 Automatic opening / closing valve

Claims (3)

[Claims] 1. An oxygen-containing gas is blown into a burned-off carbonization chamber to burn carbon adhering to the upper part of the carbonization chamber, and exhaust gas generated by this combustion is mixed with C gas generated from another carbonization chamber. A method of removing carbon adhering to a coke oven that is caused to discharge. 2. The method for removing carbon adhering to a coke oven according to claim 1, wherein the carbonization chamber in which the oxygen-containing gas is blown is a carbonization chamber in which the kiln is to be discharged next. 3. The method of removing carbon adhering to a coke oven according to claim 1 or 2, wherein the oxygen-containing gas blown into the carbonization chamber is exhaust gas sucked from an open portion of the apparatus in the C gas purification step.