CO conversion process for co-producing synthesis gas and hydrogen and isothermal shift converter

Abstract

The invention relates to a CO conversion process for co-producing synthesis gas and hydrogen and an isothermal shift converter. The CO conversion process comprises the following steps: dividing raw gas from a coal water slurry gasification device into two streams, taking one stream as non-conversion gas, subjecting the other stream to heat recovery, condensate separation and heat exchange, and then dividing the other stream into two streams; allowing the first stream to enter an adiabatic shift converter for a shift reaction, mixing synthesis gas discharged from the adiabatic shift converter with the non-conversion gas after heat recovery and then conveying the formed mixture to down stream; allowing the second stream to enter the isothermal shift converter for a medium-temperature shift reaction and a low-temperature shift reaction, wherein medium-pressure saturated steam and low-pressure saturated steam are by-produced; exchanging heat between the medium-pressure saturated steam andthe synthesis gas discharged from the adiabatic shift converter to obtain medium-pressure superheated steam; carrying out heat exchange on the low-pressure saturated steam and condensate to obtain low-pressure superheated steam; and conveying crude hydrogen obtained at the outlet of the isothermal shift converter to down stream after heat recovery.

Description

technical field [0001] The invention relates to a CO shift process, in particular to a CO shift process and an isothermal shift furnace for co-producing synthesis gas and hydrogen. Background technique [0002] my country is a country short of oil, gas, and rich in coal. The specific resources determine that the source of energy and chemical raw materials in my country must be mainly coal. Coal gasification is an important method for chemical processing of coal and the key to realize clean utilization of coal. Coal gasification technology is the core technology and leading technology of coal-based chemical industry. Among them, gasification technology using coal water slurry as raw material is an important branch, mainly multi-nozzle opposed coal water slurry gasification technology, GE gasification technology, etc. The characteristics of this type of gasification technology are that the carbon monoxide dry basis content in the crude gas produced is 38v%-50v%, and the wate...

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Problems solved by technology

[0004] At present, the process design of CO shift to synthesis gas or hydrogen supporting coal-water slurry gasification mostly adopts the method of "multi-stage adiabatic reaction + indirect heat energy recovery" to set up the process. A series of problems such as high energy consumption, large system pressure drop, and short catalyst life

[0005] Among the isothermal shift hydrogen production processes developed in recent years, whether it is an adiabatic shift series isothermal shift process, an isothermal shift series adiabatic shift process, or a double isothermal shift furnace series process, it is a single production of synthesis gas or hydrogen, which cannot be combined. Production of syngas and hydrogen

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