Tank exhaust gas recovery system and recovery method in coke oven gas blast condensation area

Abstract

The invention provides a coke oven coal gas air-blasting condensation zone tank waste gas recovery system, which comprises a tar tank, a first tar-ammonia water separation tank, a second tar-ammonia water separation tank, a tar middle tank, an ammonia water tank and a pre-separator, wherein the tar tank, the first tar-ammonia water separation tank, the second tar-ammonia water separation tank andthe tar middle tank are sequentially communicated, the second tar-ammonia water separation tank is communicated to the ammonia water tank, the first tar-ammonia water separation tank is communicated to the pre-separator, the ammonia water tank and the tar middle tank are respectively provided with a nitrogen supplementing point, and a water sealing device is arranged on the pipeline between the second tar-ammonia water separation tank and the ammonia water tank. Compared to the system and the method in the prior art, the system and the method of the present invention are suitable for the recovery of the waste gas of each storage groove tank in the coke oven coal gas air-blasting condensation zone so as to prevent atmospheric pollution.

Description

technical field [0001] The invention relates to a tank waste gas recovery system and recovery method in a coke oven gas blast condensation area, and belongs to the technical field of coke oven gas treatment. Background technique [0002] The high-temperature raw gas produced by the coke oven needs to be initially condensed and cooled first. As the temperature of the gas decreases, the volume shrinks, and the water vapor and tar vapor in the gas are separated from the gas because they reach their "dew point" and condense into liquid; Most of the naphthalene in the gas is dissolved with condensate such as tar and ammonia water; at the same time, other impurities in the gas, such as: phenol, hydrogen sulfide, hydrogen cyanide, etc. are also dissolved or absorbed with the condensate, thus So that raw gas is initially purified. [0003] When the gas is condensed and cooled, it needs: pre-separator, tar ammonia water separation tank, ammonia water tank, tar tank, pit and other eq...

AI Technical Summary

Problems solved by technology

However, due to the temperature and pressure differences of each tank, the volatilization amount in the tank is different, which causes the pipeline to be blocked, and the exhaust gas system cannot be put into normal use.

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