CO isothermal shift process matched with powdered coal gasification and isothermal shift furnace

Abstract

The invention relates to a CO isothermal shift process matched with powdered coal gasification and an isothermal shift furnace. The CO isothermal transformation process is characterized by comprisingthe following steps: dividing raw gas from upstream powdered coal gasification into non-shift gas and shift gas; subjecting the shift gas to heat recovery, gas-liquid separation and detoxification toobtain purified gas, dividing the purified gas into two streams, introducing the first stream of purified gas into an isothermal shift converter for a shift reaction, and sequentially introducing thesecond stream of purified gas into a No.1 gas-cooled shift converter and a No.2 gas-cooled shift converter for a shift reaction. After the heat of the isothermal shift gas discharged from the isothermal shift converter is recovered, the isothermal shift gas is mixed with the secondary shift gas discharged from the No.2 gas-cooled shift converter, then the heat is recovered, the shift gas is mixedwith non-shift gas to obtain syngas, and the mole ratio of H2 to CO of the syngas is 2.0 to 3.0.

Description

technical field [0001] The invention relates to a CO conversion process and equipment, in particular to a CO isothermal conversion process and an isothermal conversion furnace for pulverized coal gasification. Background technique [0002] my country is a country rich in coal resources and relatively deficient in oil resources. Since entering the 21st century, my country's coal chemical industry has entered a stage of rapid development. In view of the fact that entrained bed coal gasification technology has many advantages such as low requirements on coal quality, high effective components of synthesis gas and low operating costs, it has become a key field for the development of modern coal gasification technology. For the gasification technology using pulverized coal as raw material (such as Dongfang Furnace), the CO content of the raw gas produced by this type of gasification technology is as high as 60v%-80v% (dry basis), and the mole of water gas is 0.5-1.0. [0003] CO...

AI Technical Summary

Problems solved by technology

[0004] At present, in the design of high-concentration CO conversion process in China, the method of "multi-stage adiabatic reaction + indirect heat energy recovery" is often used to set up the process. This process is prone to overheating, long process, easy to use more equipment, large investment, high energy consumption, and system pressure drop. A series of problems such as large size and short catalyst life

[0005] Among the isothermal shift 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, each shift furnace is connected in series, and the shift gas is full gas volume Through all the conversion furnaces, the equipment size of the conversion furnace is large, the cost is high, and it is difficult to manufacture and transport

Secondly, some isothermal shift processes can only by-produce saturated steam, but cannot produce superheated steam, and the quality of steam is low

[0006] (1) As disclosed in "A Method and System for Shallow Conversion of Carbon Monoxide" disclosed in the Chinese invention patent application No. 201410837337.8, the total gas volume of water gas passes through the water transfer heat conversion furnace, and this process can only produce saturated steam; the total gas volume of water gas With the water transfer heat transfer furnace, when the device is enlarged, there will be a series of problems such as large equipment size, high cost, and difficulty in manufacturing and transport

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