Coal gas deamination and residual ammonia liquor vacuum distillation integrated production method and system

Abstract

The invention discloses a coal gas deamination and residual ammonia liquor vacuum distillation integrated production method. Ammonium sulfate production equipment is used as a vacuum system device, vacuum ammonia distillation non-condensable gas is ejected and absorbed in an ammonium sulfate saturator by the aid of a vacuum ejector, and accordingly normal production in vacuum ammonia distillation is realized; by sulfuric acid absorption, alkaline substances including ammonia and the like in the non-condensable gas can be removed to generate an ammonium sulfate product; other substances enters a coal gas system, environment pollution is avoided, and zero emission of the non-condensable gas is realized; since independent tail gas recovery devices are not needed, ammonia distillation treatment cost is reduced, investment cost is saved, yield of ammonium sulfate and coke oven gas products is increased, and high environmental protection benefits, economic benefits and social benefits are achieved. The invention further discloses a coal gas deamination and residual ammonia liquor vacuum distillation integrated production system.

Description

technical field [0001] The invention relates to the technical field of coking gas purification, in particular to an integrated production method and system for deammonization of gas and negative pressure distillation of excess ammonia water. Background technique [0002] In the metallurgical industry, especially the coking industry, the process of distilling excess ammonia to produce concentrated ammonia water is a popular ammonia distillation process. Most of the ammonia distillation uses indirect or direct atmospheric distillation, and some use negative pressure distillation. [0003] In recent years, the negative pressure ammonia distillation process has gradually increased in the coking industry. Compared with the normal pressure and negative pressure distillation processes, the negative pressure distillation process can increase the relative volatility of light components, reduce the temperature at the top and bottom of the tower, and reduce heat input, which can effecti...

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Problems solved by technology

[0003] In recent years, the negative pressure ammonia distillation process has gradually increased in the coking industry. Compared with the normal pressure and negative pressure distillation processes, the negative pressure distillation process can increase the relative volatility of light components, reduce the temperature at the top and bottom of the tower, and reduce heat input, which can effectively Reduce the energy consumption of ammonia distillation, but the tail gas produced by negative pressure ammonia distillation is difficult to deal with, and is accompanied by toxic and harmful gases and odors. At present, most of them are directly discharged into the atmosphere, causing serious environmental pollution, and the tail gas contains high ammonia. The direct method causes waste of ammonia source in the tail gas, and the latter needs to add vacuum system devices, including vacuum ejectors, vacuum ejector pumps, vacuum circulating liquid tanks, etc., resulting in a large initial investment in equipment

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