JPH05295366A - Method for treating hydrocarbon vaporizing from purification process of coke oven gas - Google Patents

Abstract

PURPOSE:To eliminate hydrocarbon at a low cost from a gas discharged from the purification step of a coke oven gas by sucking a hydrocarbon-contg. air near the opening area of an apparatus of the step, introducing the air into a recirculation line of a cooling gas in a coke dry-quenching apparatus, and thereby burning the hydrocarbon. CONSTITUTION:A red-hot coke 1 is put into the upper part of a cooling tower 1, cooled by being brought into contact with a cooling gas blown into the tower 1 by a blower 3, and discharged from the bottom of the tower 1. Separately a coke powder is removed by a dust remover 4 from the cooling gas going out through the upper part of the tower, heat is recovered from the gas by a waste heat boiler 2, and then the gas is recirculated to the cooling tower 1 by the blower 3. Hydrocarbon contained in the air present in and near the opening area of an apparatus of the purification step of a coke oven gas is burned by sucking the air to introduce it to a cooling gas recirculation line 5 which is installed before the waste heat boiler 2 of a coke dry-quenching apparatus. Thus, the hydrocarbon scattering from the opening area can be eliminated by a simple way.

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 hydrocarbons volatilized from an open part of an apparatus in a coke oven gas (hereinafter referred to as C gas) refining process.

[0002]

2. Description of the Related Art An apparatus for a C gas refining process in a coke factory has an open portion, and low boiling point components such as benzene, toluene, and xylene in tar are volatilized from the opened portion. These hydrocarbons give off an odor and are one of the causative substances that cause air pollution.

[0003]

In order to eliminate the above problems, it is necessary to prevent the vaporized hydrocarbons from leaking to the surroundings. Then, in order to prevent the leakage of hydrocarbons, it is necessary to suck and exhaust the atmosphere of the opening and its surroundings, but the sucked exhaust must be treated to remove the hydrocarbons when releasing the atmosphere. .
Further, since this exhaust gas contains only a trace amount of hydrocarbons and cannot self-combust, a special device must be installed and treated. As a special device, there is, for example, a device described in Japanese Patent Application Laid-Open No. 1-21211, which burns hydrocarbons in exhaust gas in the presence of a catalyst. Furthermore, when the hydrocarbon in the exhaust gas is burned by the above-mentioned catalytic oxidation method, the exhaust gas must be heated to several hundred degrees, and energy for that purpose is required.

In order to prevent the leakage of hydrocarbons by exhausting the exhaust gas from the open portion as described above, a large amount of equipment cost and a large amount of fuel are required to process the exhaust gas, and the device is operated. Personnel will be required.

The present invention provides a method for treating hydrocarbons volatilized from a C gas refining process that does not require the installation of a special device such as a catalytic oxidation device and does not require fuel for heating exhaust gas. The purpose is to do.

[0006]

In order to achieve the above object, in the present invention, the atmosphere of the open part of the apparatus for the C gas refining step and the atmosphere around it are sucked, and this exhaust is abandoned in coke dry fire extinguishing equipment. It is introduced into the cooling gas circulation passage before the heat boiler to burn the hydrocarbons in the exhaust gas.

[0007]

In dry coke fire extinguishing, red hot coke is charged into a cooling tower, and cooling gas is introduced into the cooling tower to cool the red hot coke. This cooling gas is circulated and used while being recovered by the waste heat boiler. The temperature of the cooling gas discharged from the cooling tower is a high temperature of about 800 ° C. Therefore, if the exhaust gas sucked from the open part of the apparatus in the C gas refining step is mixed with this cooling gas, the hydrocarbons in the exhaust gas will burn.

On the other hand, in the coke dry fire extinguishing process, when the cooling gas is circulated and used, H generated from the red hot coke
₂ , flammable gas such as CO accumulates and its concentration gradually increases. If this concentration exceeds a predetermined value, there is a danger of explosion, so it is necessary to prevent the concentration of the combustible gas from exceeding the predetermined value.

Therefore, if the exhaust gas is mixed with the cooling gas, the hydrocarbons in the exhaust gas are burned and the combustible gas in the cooling gas is also burned, which is an extremely effective exhaust gas treatment method. is there.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram of an embodiment according to the present invention. In the figure, 1 is a cooling tower, 2 is a waste heat boiler, and 10
Is red hot coke. The red hot coke 10 charged into the upper part of the cooling tower 1 comes into contact with the cooling gas introduced by the blower 3 to be cooled, and is discharged from the lower part of the cooling tower 1.
Then, the cooling gas is discharged from the cooling tower 1, the coke dust is removed by the dust remover 4, the heat is recovered by the waste heat boiler 2, and then introduced into the cooling tower by the blower 3.

In the present embodiment, the exhaust gas sucked from the open portion of the apparatus for the C gas refining process is introduced into the cooling gas circulation passage. This exhaust gas is introduced into the cooling gas circulation passage before the waste heat boiler 2, and is introduced from the flue inspection hole 5 of the cooling tower 1 in this embodiment. The location where the exhaust gas is introduced does not necessarily have to be the inspection hole 5, and may be a duct before the waste heat boiler 2. If necessary, the air blower 6 blows air into the duct before the waste heat boiler 2. The introduced exhaust gas mixes with the circulating cooling gas,
The hydrocarbons in the exhaust gas and the combustible gas in the cooling gas burn. The amount of heat generated by this combustion is recovered by the waste heat boiler 2. In this case, the amount of exhaust gas introduced or the amount of air blown from the air blower 6 is adjusted so that the oxygen concentration in the cooling gas does not exceed 1%.

[0012]

Industrial Applicability According to the present invention, the air around the open part of the apparatus for the C gas purification process and the atmosphere around it are sucked, and this exhaust gas is introduced into the cooling gas circulation passage of the coke dry fire extinguishing equipment to remove the hydrocarbons in the exhaust gas. It is a method of burning. According to the present invention, there is no need to install a new device and no additional fuel is needed to heat the exhaust.

If the above exhaust gas is introduced into a coke dry fire extinguishing system, the hydrocarbons in the exhaust gas are burned and
Combustible gas in the cooling gas is also burned, and the exhaust gas is treated very effectively.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Cooling tower 2 Waste heat boiler 3 Blower 4 Dust remover 5 Flue inspection hole 10 Red-hot coke

Claims (1)

[Claims] 1. A coke oven gas refining process, an open part of the device and the atmosphere around it are sucked in, and this exhaust gas is introduced into the cooling gas circulation passage before the waste heat boiler in the coke dry type fire extinguishing equipment. A method for treating hydrocarbons volatilized from a coke oven gas refining process comprising burning hydrocarbons.