Combined fluidized bed and fixed bed coal catalytic gasification reaction device and method thereof

Abstract

The invention relates to a fluidized bed and fixed bed combination type catalytic gasification apparatus and a fluidized bed and fixed bed combination type catalytic gasification method. A purpose ofthe present invention is to solve the problems of low carbon conversion rate, low gasification intensity, low methane yield, and poor operation stability and poor reliability of the gasification furnace in the prior art. The technical scheme of the present invention comprises that the fluidized bed and fixed bed combination type catalytic gasification apparatus comprises a fluidized bed gasification section on the upper portion and a fixed bed gasification section on the lower portion, the two gasification sections are connected by using a throat, a raw material inlet, a circulation synthesisgas inlet, a first-stage return material inlet and a gas distributor are arranged in the fluidized bed gasification section, and a furnace grate and a second-stage return material inlet are arranged in the fixed bed gasification section. The fluidized bed and fixed bed combination type catalytic gasification method mainly comprises that a carbon-containing raw material, a catalyst, the semi-coke particles of a first-stage return material, circulation synthesis gas and high-temperature mixed gas are subjected to pyrolysis, gasification and methanation in the fluidized bed gasification section,the incompletely-reacted coarse residue and second-stage fine ash particles enter the fixed bed gasification section, and a combustion gasification reaction is performed. With the technical scheme ofthe present invention, the problem in the prior art is well solved. The apparatus and the method of the present invention can be used in the field of the preparation of methane-rich synthesis gas fromcoal.

Description

technical field [0001] The invention relates to a coal catalytic gasification reaction device and method. More specifically, the present invention designs a catalytic gasification reaction device and method combining a fluidized bed and a fixed bed, and belongs to the field of coal catalytic gasification. Background technique [0002] Rich coal, poor oil, and little gas are the characteristics of my country's energy structure. With the rapid development of my country's economy and the acceleration of urbanization, the demand for natural gas is increasing. my country's own natural gas production cannot meet the demand for natural gas, and the contradiction between supply and demand has become increasingly prominent. The supply gap can only be made up by relying on imports, which has greatly affected my country's energy security. In view of the fact that my country is a large coal country with abundant coal output, converting coal into natural gas is an important way for clean...

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems mainly solved by the present invention is the problems of low carbon conversion rate and gasification intensity, low methane yield and poor operation stability in the prior art. The gasification device is composed of a fluidized bed gasification section and a fixed bed gasification section. In the fluidized bed gasification section, carbon-containing raw materials loaded with catalysts, circulating synthesis gas and high-temperature mixed gas are fed into the fluidized bed gasification section for pyrolysis and gasification. and methanation reactions

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