A method and equipment for multi-stage entrained entrained bed coal gasification coupled with high temperature shift

Abstract

A multi-stage entrained-flow coal gasification method capable of realizing coupling high temperature shift comprises the following steps: dry coal powder and a gasifying agent are vertically sprayed into a high-temperature gasification section from a burner of a multi-stage entrained-flow gasifier for coal gasification reaction, generated hot coal gas and molten slag flow downwards into a high-temperature conversion section, converted spray water or low-temperature steam is sprayed into the gasifier from an atomization spray head to be subjected to high-temperature water vapor shift reaction to generate H2, coal gas and ash enter a chilling section through a flow guide pipe, and the coal gas is cooled, washed, discharged out of the gasifier from a crude coal gas outlet, and fed into a post-system to be purified. The method has the advantages that the operation is easy, the thermal efficiency is high, the hydrogen content in coal gas is high, and the adaptability to coal type is good.

Description

technical field [0001] The invention relates to a dry coal pulverized entrained bed gasification technology, in particular to a multi-stage entrained entrained bed coal gasification method coupled with high temperature conversion and its equipment. Background technique [0002] Coal gasification technology is the core and leading technology of the coal chemical industry, and it is also one of the key technologies to realize efficient and clean utilization of coal. The rapid expansion of the coal chemical market has further promoted the considerable progress of coal gasification technology. Pressurization, large-scale, and strong adaptability of raw materials are the development directions of advanced gasification technology. [0003] Gasification technology can be divided into fixed bed, fluidized bed and entrained bed gasifier according to the way of gas-solid contact. Among them, the entrained bed gasifier has the advantages of large production capacity, high carbon conve...

AI Technical Summary

Problems solved by technology

[0004] Although dry coal powder entrained bed gasification technology has been industrialized and maturely applied, there are still some disadvantages: (1) Coal gas high-temperature quenching process is commonly used, and the crude gas at 1200-1500 °C is quenched and cooled to 200-250 °C, and the sensible heat of gas Large loss; (2) The CO concentration in the crude gas is over 65%, and the H 2 Low content, for chemical synthesis processes that require hydrogen, such as synthetic ammonia, synthetic methanol, and synthetic oil, the post-system CO conversion load is large; (3) For coals with high coal ash melting point and high viscosity-temperature characteristics, it is easy to cause blockage of the ash discharge port , so it is generally only suitable for coals whose ash melting point is less than 1300°C

However, the multi-nozzle feeding method also makes the control system complex, increases the difficulty of operation, and cannot solve the technical problem of high-temperature sensible heat utilization

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