Method for simultaneously preparing pure hydrogen and pure carbon monoxide by gasification without desorbed gas circulation

Abstract

The invention discloses a method for simultaneously preparing pure hydrogen and pure carbon monoxide by gasification without desorbed gas circulation. The crude synthetic gas prepared by the gasification unit is divided into two parts, one part is used for preparing pure carbon monoxide, and the other part is preparing pure hydrogen. The process of preparing pure carbon monoxide is divided into two parts: one part is used for preparing pure carbon monoxide with the crude synthetic gas prepared by gasification by a heat recovery unit, a low temperature methanol washing I unit, and a cryogenic separation unit; and the other part is used for preparing pure carbon monoxide by the hydrogen rich gas from the outlet of the cold box of the cryogenic separation unit sending into a PSA-CO unit. The feedstock of preparing hydrogen is divided into two parts: one part is the converted gas which is purified by a conversion unit and a low temperature methanol washing II unit with the crude synthetic gas prepared by gasification and contains carbon monoxide -1% (mol), and the other part is the hydrogen rich gas from a resurgent TSA device of the cryogenic separation unit, and the two parts of the gas are mixed and sent into the PSA-H2 unit to prepare pure hydrogen. The method has high recovery rates of carbon monoxide and hydrogen, has no desorbed gas circulation and no resurgent gas introduced by environment, has small investment and low energy consumption, and can adjust product gas scale of hydrogen and carbon monoxide flexibly.

Description

technical field [0001] The invention provides a device and method for simultaneous production of hydrogen and carbon monoxide from gasification synthesis gas widely used in coal chemical industry and petrochemical industry. Specifically, coal gasification or petroleum coke gasification is used to produce crude synthesis gas, and the crude synthesis gas is converted and (or) heat recovery unit, low-temperature methanol washing unit, cryogenic separation unit, PSA-H 2 unit and (or) PSA-CO unit to produce pure hydrogen and pure carbon monoxide gas. Background technique [0002] Hydrogen is a basic industrial raw material, and also the most important industrial gas and special gas. It is widely used in petrochemical, coal chemical, metallurgical chemical, food processing, fine organic synthesis and other industries. [0003] Carbon monoxide is widely used in metallurgical and chemical industries, as a reducing agent for coking and iron making, and as a basic raw material gas fo...

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Problems solved by technology

This process effectively reduces the loss of carbon monoxide gas, but the pressurization process of the cycle gas compressor increases the equipment investment and the power consumption of the compressor operation

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