Poly-generation isothermal shift process matched with powder coal gasification process, and isothermal shift converter

Abstract

The invention relates to a poly-generation isothermal shift process matched with a powder coal gasification process, and an isothermal shift converter. According to the process, condensate is separated from raw coal gas from a powder coal gasification device, the obtained crude coal gas is subjected to heat exchange and detoxifying, the detoxified coal gas is divided into two streams, the first-stream purified gas is non-shift gas, and the second-stream purified gas is fed into an isothermal shift converter and is subjected to isothermal shift after the water-gas molar ratio of the second-stream purified gas is regulated; boiler water enters the isothermal shift converter to carry away reaction heat and by-produce medium-pressure saturated steam; and the shift gas discharged from the isothermal shift converter are divided into two streams after heat recovery, the first-stream shift gas enters a low-temperature shift converter and is subjected to a deep shift reaction, and crude hydrogen at an outlet is fed to the downstream after heat recovery; and the second-stream shift gas is mixed with the first-stream shift gas to obtain crude synthesis gas after heat recovery, the heat is further recovered, and condensate is separated and fed to a downstream device.

Description

technical field [0001] The invention relates to a CO conversion process and equipment, in particular to a polygeneration isothermal conversion process and an isothermal conversion furnace for a supporting pulverized coal gasification process. Background technique [0002] my country is a country short of oil, gas, and rich in coal. The characteristics of resources determine that the source of energy and chemical raw materials in my country must be dominated by coal. Coal gasification is an important method for chemical processing of coal and the key to realize clean utilization of coal. For the gasification technology using pulverized coal as raw material (such as Dongfang Furnace), the crude gas CO content produced by this type of gasification technology is as high as 60v%-80v% (dry basis), and the water vapor mole is 0.5-1.0. [0003] The CO conversion process is an indispensable part of modern coal chemical technology, and plays a link between the past and the future. T...

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Problems solved by technology

[0004] At present, the CO shift hydrogen production process design of the domestic supporting pulverized coal gasification process mostly adopts the method of "multi-stage adiabatic reaction + indirect heat energy recovery" to set up the process. A series of problems such as overtemperature, long process, many equipment, large investment, 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, they all produce syngas or hydrogen in a single way. Related processes for produci

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