Coal gasification method

Abstract

The invention discloses a coal gasification method and relates to the technical field of coal gasification. The coal gasification method can avoid scorification in a gasification method to ensure continuous and stable operation in the gasification process and expand the coal type application range of the gasification process. The coal gasification method disclosed by the invention comprises the following steps: supplying coal, a gasifying agent and slag containing silicoaluminate to gasifying equipment; and carrying out a gasification reaction on coal and the gasifying agent in the gasifying equipment. The coal gasification method disclosed by the invention is suitable for the coal gasification process.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a coal gasification method. Background technique [0002] As a resource with abundant reserves, coal occupies an important position in the energy structure. Coal gasification is one of the main ways to efficiently and cleanly utilize coal. [0003] A major problem in the coal gasification process is the slagging of coal ash. The ash melting temperature of some coal types is low, which leads to easy slagging during gasification. The slagging of coal ash will affect the operation to varying degrees, and severe slagging will lead to production shutdown. Especially in the process of catalytic gasification reaction, the addition of catalyst can catalyze the gasification reaction, reduce the reaction temperature, and obtain a higher reaction rate at low temperature; but the added alkali metal catalyst will react with minerals in coal during the catalytic gasification proces...

AI Technical Summary

Problems solved by technology

The ash melting temperature of some coal types is low, which leads to slagging during gasification. The slagging of coal ash will affect the operation to varying degrees, and serious slagging will lead to shutdown

Especially in the process of catalytic gasification reaction, the addition of catalyst can catalyze the gasification reaction, reduce the reaction temperature, and obtain a higher reaction rate at low temperature; but the added alkali metal catalyst will react with minerals in coal during the catalytic gasification process Form low-temperature eutectics and reduce the ash melting point of coal, especially for slagging coals with low silicon-aluminum content and high iron-calcium content in ash, the addition of catalyst will greatly reduce the ash melting point of coal, resulting in coal ash particles Mutual bonding and slagging, resulting in poor fluidization conditions, and in severe cases, it will cause difficulty in slagging, or even loss of fluidization, etc., making it difficult for the reactor to operate continuously and stably, making the used coal unsuitable for catalytic gasification process, resulting in catalytic gasification The applicable range of coal types for the gasification process is narrow

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