Method for ammonia removal of coke oven gas

Abstract

The invention discloses a method for ammonia removal of a coke oven gas. According to the method, on the basis of the existing production process method, residual ammonia water is used for cooling ammonia distillation wastewater, which is generated by an ammonia still, to 55-65 DEG C in a first heat exchanger, and then the cooled ammonia distillation wastewater is used as new water delivered into a saturator to prepare a mother solution. Because the temperature of the added ammonia distillation wastewater is close to that of the mother solution in the saturator, the temperature of the mother solution cannot be greatly influenced after the ammonia distillation wastewater is added into the mother solution, and the temperature of the mother solution always fluctuates up and down in a reasonable range of set values, thereby ensuring the normal and stable production of an ammonia removal process of the coke oven gas; and the ammonia distillation wastewater is used for replacing middle-temperature water or low-temperature water and the like to serve as the new water supplemented into the mother solution, so that the new water consumption of the ammonia removal process is reduced, and the repeated utilization of the ammonia distillation wastewater is realized at the same time.

Description

Technical field [0001] The invention relates to the technical field of coke oven gas purification technology, in particular to a coke oven gas deamination method. Background technique [0002] Coke oven gas refers to a kind of combustible gas produced by blending several bituminous coals into coking coal after high-temperature dry distillation in the coking oven to produce coke and tar and other products. It is a by-product of the coking industry. The main components of coke oven gas are water vapor, hydrogen, methane, tar gas, benzene vapor, naphthalene vapor, ammonia, carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen cyanide and other gases. [0003] With the improvement of environmental protection requirements, it is necessary to purify the coke oven gas produced by the coke oven to remove various impurities such as hydrogen sulfide, hydrogen cyanide, ammonia, tar and naphthalene, so that it can meet national or industry standards. For industrial or civilian users; at...

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Problems solved by technology

During the production process, the temperature of the mother liquor needs to be maintained at 45°C to 55°C, while the medium temperature water is about 30°C, and the low temperature water is about 18°C. Both temperatures are far lower than the mother liquor temperature. After adding the mother liquor, the mother liquor temperature drops greatly , reduces the absorption rate of ammonia in the gas by the mother liquor, reduces the crystallization rate of ammonium sulfate, seriously affects the normal and stable production of the entire deammonization process, and consumes a large amount of new water at the same time, resulting in higher production costs

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