Technological method for purifying coal oven gas and recovering chemical products

Abstract

The utility model discloses a technological method for purifying coal oven gas and recovering chemical products, and belongs to the technical field of coal oven gas purifying and chemical product recovering. The technological method is characterized in that the coal oven gas purification includes the basic technological processes: raw coke oven gas procedure-gas-liquid separation-cooling-benzol washing-tar oil electrofishing-desulfurizing-coal gas blower procedure-ammonium sulfate procedure-purified coal gas procedure, that is, the benzol washing procedure is carried out after the cooling procedure, the tar oil electrofishing is carried out between the benzol washing procedure and the desulfurizing procedure; the coal gas blower procedure is set after the desulfurizing procedure and before the ammonium sulfate procedure. After the traditional technological processes are recombined and optimized, the technological processes are reduced, the resistance of a purification system is reduced, the investment and operation cost is reduced, and the energy source is reduced, the benzol washing procedure and the tar oil electrofishing procedure are carried out before the desulfurizing procedure, and the content of tar oil (including scrubbing oil) and the content of naphthalene in the coal gas are reduced as far as possible, so that the desulfurizing process is guaranteed to be carried out smoothly, the cooling, benzol washing, desulfurizing and other procedures are in the state of negative pressure, the emission of air pollutants is reduced, and the environment protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification and chemical product recovery, in particular to a process method for recovering benzene, naphthalene, tar, sulfur, ammonia and other chemical products in gas through a gas purification device to produce clean gas for users. Background technique [0002] The process flow of traditional coke oven gas purification is: raw gas → gas-liquid separation → initial cooling → gas transportation → electric tar catcher → precooling → desulfurization → preheating → ammonium sulfate → final cooling → benzene washing → clean gas. [0003] The coke oven gas of the traditional process is sprayed with a large amount of circulating ammonia water in the gas collecting pipe and the bridge pipe to cool the gas to 80-90 ℃. It is separated from tar, ammonia water, tar residue, etc., and then cooled to 25-35 °C through the horizontal tube primary cooler, the condensed ammonia water is partially circulat...

AI Technical Summary

Problems solved by technology

In the process of raising and lowering the gas temperature, it needs to consume energy at the cost, so a lot of energy is wasted

[0005] The traditional coke oven gas purification process uses ammonia as an alkali source wet catalytic oxidation method to remove sulfur in coke oven gas. Ideally, the desulfurization regeneration liquid contains impurities such as tar and naphthalene. These impurities will not only affect the quality of sulfur produced, but also cause phantom bubbles in the regeneration tower, affecting the normal operation of desulfurization production and resulting in low desulfurization efficiency.

[0006] The traditional coke oven gas purification process mostly uses steam as an inferior energy carrier. Steam is used as the heating medium to provide heat for the ammonia distillation section and the debenzene section. Turned into wastewater, leading to an increase in the discharge of coking wastewater

[0007] The operating conditions of all purification proc

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