Low-temperature methanol washing device and method for removing acid gas in synthesis gas

Abstract

The invention discloses a low-temperature methanol washing device and a method for removing acid gas in synthesis gas. A main low-temperature methanol washing process is reconfigured, semi-lean solution methanol is additionally taken as main washing methanol on the basis of an original full-lean solution absorption process, and the dosage of lean solution methanol is decreased by 15%-30%, so that the dosages of thermal regeneration tower reboiler steam, thermal regeneration tower top condenser circulating water, lean methanol water cooler circulating water and H2S concentration tower gas stripping nitrogen are decreased by 15%-30% to achieve the energy saving and yield increasing targets; meanwhile, a traditional three-stage condensation process on a thermal regeneration tower top is canceled, therefore, methanol losses are reduced, and an ammonia crystallization phenomenon is avoided. Energy saving and yield increasing improvement on a traditional low-temperature methanol washing device is also suitable for the newly-built low-temperature methanol washing device.

Description

technical field [0001] The invention relates to the technical field of low-temperature methanol washing and purification synthesis gas treatment, in particular to a low-temperature methanol washing device and a method for removing acid gas in synthesis gas. Background technique [0002] my country's main fossil resources are still dominated by coal. Our country is a typical country with more coal and less gas. At present, coal chemical industry has been relatively mature after years of development. Downstream products come in various forms, and all of them are important basic chemical raw materials. Given the low temperature methanol on H 2 S / CO 2 It has the characteristics of very strong selective absorption capacity and cheap and easy-to-obtain raw materials. Almost all the purification sections of coal chemical enterprises that use coal as raw material are equipped with low-temperature methanol washing sections to remove H in the synthesis gas. 2 S / CO 2 and other co...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to overcome the defects of high energy consumption, serious loss of methanol and easy occurrence of ammonia crystallization in the low-temperature methanol washing device in the prior art, and provide a low-temperature methanol washing device and a method for removing and synthesizing sour gas method

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