Process of removing sulfur and ammonia from coke gas to prepare ammonia water

Abstract

The invention discloses a process of removing sulfur and ammonia from coke gas to prepare ammonia water. On the basis of existing AS methods, ammonia in the coke gas serves as an alkali source, ammonia water containing solution serves as a medium, the ammonia and hydrogen sulfide in the coke gas are removed by cyclic ammonia / sulfur absorption, desulphurizing, ammonia-washing rich solution pressurization, deabsorption and regeneration process, and meanwhile the remaining ammonia water is processed by a low-pressure ammonia distilling tower which takes remaining heat of a system as a heat source, and 5-20% of ammonia water is byproduct in the process. The process comprises an ammonia and hydrogen sulfide absorption part, an ammonia and hydrogen deabsorption part and remaining ammonia water based ammonia distilling part. Clean gas produced by the process can meet requirements of Admittance Standard of Coking Industry, and the process disclosed by the invention has the advantages of short process flow, low operation cost, good resource utilization and good environmental protection effect.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a process for preparing ammonia water through desulfurization and deammonification of coke oven gas. Background technique [0002] At present, domestic coke oven gas desulfurization and deammoniation mainly include the ammonia-sulfur cycle washing method using ammonia as the alkali source (i.e. the AS method) and the wet oxidation method using ammonia as the alkali source (i.e. the HPF method). The reference is: Luan Zhenyu.AS Ammonia desulfurization process and operation by method [J]. Hebei Chemical Industry, 2010, 33(5): 59-60; Wang Jianhua, Li Shuai. Analysis and improvement of AS method gas desulfurization process [J]. Fuel and Chemical Industry, 2008, 39 (4): 49-50; Cui Xiaojun, Li Guang. Application and improvement of HPF desulfurization process [J]. Fuel and Chemical Industry, 2007, 38(3): 53-55; Dong Yanjun, Xu Daoliang, Zheng Xianyong. Coke oven gas HPF Impro...

AI Technical Summary

Problems solved by technology

The AS method has poor effects on gas desulfurization and ammonia purification (the reason is that the effect of deacidification and steaming ammonia is poor, and the amount of washing liquid is small), and the hydrogen sulfide content after general gas desulfurization and ammonia washing is about 400-600mg / Nm 3 , containing ammonia about 100mg / Nm 3 , failed to meet the index requirements, high production management requirements for plant operation (five-tower combined transport), and ammonia resources (incineration) were not utilized

The HPF method has problems such as difficult treatment of desulfurization waste liquid, low sulfur purity, high ammonia content in the tail gas of the regeneration tower, and air pollution. At the same time, the HPF method uses precious sulfuric acid to produce inferior fertilizer-ammonium sulfate, which has no economic benefits

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