Process and system for producing ammonium sulfate by deaminizing coke oven gas with ammonium sulfite method

Abstract

The invention provides a process and a system for producing ammonium sulfate by deaminizing coke oven gas with an ammonium sulfite method. The process for producing the ammonium sulfate by deaminizingthe coke oven gas with the ammonium sulfite method comprises the following steps of using ammonia in the coke oven gas and sulfur dioxide generated by sulfur paste, generated by the wet oxidative desulfurization on the gas with an ammonia method, or an acid gas, generated by desulfurization with an absorptive method, through incineration as raw materials, absorbing the ammonia in the coke oven gas by adopting an ammonium sulfite solution as a solvent, regenerating the ammonium sulfite solution through absorbing the sulfur dioxide in flue gas generated by the incineration of the sulfur paste or the acid gas, and converting ammonium sulfite generated by absorbing the ammonia and the sulfur dioxide into ammonium sulfate through oxidation. The problem that a device in a process of washing theammonium with sulfuric acid is seriously corroded is solved. According to the process, cooling water absorbs sulfur trioxide to generate the sulfuric acid which can be used for replacing sulfuric acid which is needed to be purchased when the ammonium sulfate is produced; and the resource is comprehensively utilized. The invention also discloses the system for producing the ammonium sulfate by deaminizing the coke oven gas with the ammonium sulfite method. The system has the advantages of being low in investment, low in energy consumption and easy to popularize.

Description

technical field [0001] The invention relates to coal chemical technology, in particular to a process and system for producing ammonium sulfate by deammonization of coke oven gas with ammonium sulfite. Background technique [0002] The gas produced in the coking production of coke ovens contains harmful impurities such as ammonia and hydrogen sulfide, which need to be purified to remove harmful impurities and recover chemical products; the purified coke oven gas is used as industrial fuel or chemical synthesis raw material gas. At present, sulfuric acid absorption method is mainly used for deammonization of coke oven gas, and sulfuric acid is used to absorb ammonia to produce ammonium sulfate. This process is characterized by simple process flow and wide application of ammonium sulfate products; Purchased sulfuric acid increases production costs. Coke oven gas dehydrogen sulfide mainly adopts absorption method and ammonia wet oxidation method. The absorption method is to wa...

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for the problems of long process flow, high investment and high operating costs in the current coke oven gas desulfurization slurry acid production process, and the need to add purchased sulfuric acid in the coke oven gas production ammonium sulfate process. Coke oven gas ammonium sulfite deamination process to produce ammonium sulfate. This process uses ammonium sulfite solution as a solvent to absorb ammonia in coke oven gas. Ammonium sulfite solution absorbs sulfur slurry or acid vapor incineration to produce flue gas The sulfur dioxide can be regenerated, and the ammonium sulfite produced by absorbing ammonia and sulfur dioxide is oxidized and converted into ammonium sulfate, which effectively improves the utilization rate of resources.

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