Process for gasification production of synthesis gas through low temperature entrained-flow bed by using ultrafine powder

Abstract

The invention discloses a process for gasification production of synthesis gas through a low temperature entrained-flow bed by using ultrafine powder. The process comprises the steps: spraying an ultrafine gasified raw material which is pulverized to less than 75 [mu]m and a gasification agent into a gasification furnace from the top of the gasification furnace of the entrained-flow bed, performing a reaction on the gasified raw material and the gasification agent so as to generate the synthesis gas containing carbon monoxide and hydrogen at a gasification temperature of lower than 1300 DEG C, spraying chilled water during downward flow of the synthesis gas, and reducing the temperature of the gas so as to meet requirements for the entrance temperature of a cyclone separator, wherein the entrance temperature of the cyclone separator is generally lower than 900 DEG C; discharging the gas with ash slag from a lower outlet of the gasification furnace after cooling, introducing the gas directly into the cyclone separator, removing most of coarse particles and a part of fine ash which are carried by the gas, then introducing the obtained gas into a waste heat boiler for further cooling of the gas, generating steam at the same time, finally introducing the gas into a filter so as to remove fine dust entrained in the gas, and sending the obtained gas to a subsequent section. In the gasification process, the ash slag does not have to reach a melt flow state, and the process is particularly suitable for production processes of low-activity coal and gasification of coal with a high-ash fusion point.

Description

Technical field [0001] The invention relates to a process for producing synthesis gas by gasification of ultrafine powder in a low-temperature entrained bed, in particular to a gasification method and process for producing synthesis gas by using carbonaceous materials as raw materials. Background technique [0002] Entrained-flow gasification technology has been recognized and applied in the current coal chemical industry production of synthesis gas and hydrogen production in the refining and chemical industry. In order to ensure the smooth discharge of the remaining ash and slag after gasification during the operation of the entrained bed gasifier, and to ensure the normal flow of liquid ash and slag in the entrained bed gasifier, the gasification temperature of the entrained bed gasifier is generally higher than that of the gasification. The flow temperature of the ash remaining after the raw material has been gasified. In industrial enterprise applications, in order to achiev...

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Problems solved by technology

[0005] The present invention aims at the problems that the gasification of the current entrained bed gasification furnace must be carried out under high temperature conditions and the erosion of refractory materials, etc., and proposes a new gasification method and process, which is characterized in that compared with the current gas flow Bed gasification technology must be gasified at high temperature, the operating temperature in the gasification furnace in the present invention is much milder, and the ash produced in the gasification process still exists in solid form, and does not have to reach the state of melting and flowing

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