System and method for treating benzene-contained separating water of coking benzol

Abstract

The invention belongs to the technical field of purifying coke oven gas, and relates to a system and method for treating benzene-contained separating water of coking benzol. The method comprises the following steps that: benzene-contained and oil-contained separating water which is separated in a benzol production process is fed to an inlet pipeline of a circulating ammonia pump through a pipeline; the benzene-contained and oil-contained separating water reaches the circulating ammonia pump through an inlet of the circulating ammonia pump; raw coke oven gas reaches a gas collecting pipe of a coke oven for spraying by pressurizing the circulating ammonia pump; heat exchange is carried out on the raw coke oven gas in the gas collecting pipe at a temperature of 780-850 DEG C; benzene matter is separated from water so as to rapidly volatilize to mix with gas due to heating effects of the raw coke oven gas at a high temperature, and enters a next benzene washing process with gas; the separating water in which the benzene is removed is mixed with an ammonia tar system; and finally, ammonia enters an ammonia vaporizing system for treatment and oil matter enters a tar system. According tothe invention, the treatment efficiency of the benzene-contained separating water is high and the treatment speed of the benzene-contained separating water is high. Meanwhile, the conventional equipment and device in coking can be sufficiently used, so that the operation cost is low, the operation field conditions is improved, and the yield of chemical product of benzol is increased.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification, in particular to a coking crude benzene-containing benzene separation water treatment system and method. Background technique [0002] In the production process of crude benzene in the gas purification process of the coking plant, since the washing oil is used to spray and absorb the organic substances such as benzene, toluene and naphthalene in the gas, the washing oil that absorbs the organic substances such as benzene, methylbenzene and naphthalene is heated and then sent to the debenzene The tower is subjected to debenzene and naphthalene removal. At present, there are mainly two kinds of benzene removal processes in the debenzene tower in China. One is to use steam for positive pressure distillation, and steam is directly blown from the bottom of the tower. This process finally separates more water; the other is negative pressure distillation. , A vacuum pump is used to e...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a coking crude benzene-containing benzene separation water treatment system and method, which have high efficiency in removing benzene and naphthalene and will not cause secondary pollution, and at the same time solve the problem of Benzene pollution from separating water to gas suction pipeline or mechanized ammonia water clarifier

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