Acidic gas removal process used for pulverized coal gasification

Abstract

The invention includes an acidic gas removal process used for pulverized coal gasification. The process is characterized by including the following steps: mixing synthesis gas, cyclic flash steam and antifreeze methanol, conducting cooling, removing a condensed fluid, sending the separated gas phase to a H2S absorption tower and a CO2 absorption tower in sequence, removing acidic gas in the synthetic gas to obtain the purified gas, and discharging the purified gas to the outside; after the synthetic gas is washed, sending gas-rich methanol to corresponding regeneration workshop sections of a medium-pressure flash column, a reabsorber and a thermal regeneration column respectively for regeneration; after the regeneration, sending gas-poor methanol, full-lean solution, semi-lean solution, H2S-rich methanol and CO2-rich methanol to corresponding workshop sections respectively for use, and discharging redundant methanol to the outside.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to an acid gas removal process for pulverized coal gasification. Background technique [0002] Based on the current situation of my country's resources with more coal, less oil and less gas, the chemical industry using coal as raw material has developed rapidly in recent years. Coal is gasified at high temperature to produce H 2 The crude synthesis gas with CO as the main component is a suitable raw material for the production of C1 chemical industry and its derivatives. Pulverized coal gasification has been widely used due to its characteristics of wide adaptability to coal types, high energy utilization rate and high gas production capacity per unit of equipment. The crude synthesis gas produced by the pulverized coal gasification process contains H 2 , CO, CO 2 In addition, there is a small amount of H 2 S, COS, NH 3 , HCN and other trace components, where H 2 It i...

AI Technical Summary

Problems solved by technology

[0007] 3. Due to the semi-poor solution to CO 2 The reabsorption capacity is limited. In order to ensure the gas purification effect, the semi-lean liquid circulation volume must be increased, which additionally increases the gas absorption section load and cycle power consumption, and limits the size of the device.

[0008] 4. Before the methanol-rich gas ente

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