Purification process for removing sulphur and carbon dioxide in gas by using two-step method

Abstract

The invention discloses a purification process for removing sulphur and carbon dioxide in gas by using a two-step method. The purification method comprises six steps as follows: the crude desulphurization of low-pressure high-sulphur gas, desulphurization of high-pressure gas, CO2 removal, the regeneration of decarburization solution, the regeneration of desulfurization solution and H2S concentration, and heat regenerating system. The purification process has the advantages of low energy consumption, low operation strength, simple process and high purification.

Description

technical field [0001] The invention belongs to a coal gas purification process, in particular to a purification process for removing sulfur and carbon dioxide in the coal gas. Background technique [0002] In the crude gas produced by some high-sulfur coal gasification processes, the pressure of the gas is low but the sulfur content is very high. This working condition will have a very adverse impact on the selection and operation of the gas compressor. Therefore, it is required to desulfurize the crude gas first, then compress it and then carry out transformation, fine desulfurization, decarburization and other processes. If the desulfurization of crude gas adopts general liquid-phase wet oxidation methods such as improved ADA and tannin extraction, etc., it can also meet the desulfurization and purification requirements. However, the biggest defect of these desulfurization methods is the low sulfur capacity of the solution. However, there are disadvantages such as large ...

AI Technical Summary

Problems solved by technology

If the desulfurization of crude gas adopts general liquid-phase wet oxidation methods such as improved ADA and tannin extraction, etc., it can also meet the desulfurization and purification requirements. However, the biggest defect of these desulfurization methods is the low sulfur capacity of the solution. However, there are disadvantages such as large amount of solution circulation required, large number of desulfurization towers, large diameter, large number of sulfur recovery melting tanks, large land occupation, high operating intensity, and high energy consumption.

Moreover, the crude gas desulfurization and subsequent fine desulfurization, decarbonization and other processes adopt different technologies, which makes the whole device process complicated, operation and management inconvenient, and investment increased

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