Coal co-gasification method

Abstract

The invention relates to the field of coal gasification, especially a coal co-gasification method. The method comprises the following steps: 1. injecting a fuel and a first pressure oxygen-containing gas into a gasifier, and igniting the fuel to heat the inside of the gasifier; 2. when reaching the temperature capable of igniting coal powder to be injected, stopping injecting the fuel, keeping injecting the first pressure oxygen-containing gas, and injecting a pressure carbon dioxide gas carrying the coal powder to be injected into the gasifier to perform powder coal gasification; and 3. after the powder coal is gasified to a stable state, injecting coal water slurry and a second pressure oxygen-containing gas into the gasifier to perform co-gasification. The invention provides a stable-operation coal co-gasification method which constructs co-gasification after ensuring stable powder coal gasification, thereby ensuring the stable operation in the co-gasification process; and thus, the method does not need to be confronted with the adjustment step which is complex, time-consuming and difficult in the prior art.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to a coal co-gasification method. Background technique [0002] Coal gasification refers to a series of chemical reactions between the organic matter in the coal and the gasification agent (such as oxygen) at a certain temperature and pressure, and the conversion of solid coal into CO, H 2 、CH 4 Combustible gases such as CO and 2 , N 2 At present, common coal gasification technologies mainly include coal water slurry gasification technology, pulverized coal gasification technology, biomass gasification technology, and multi-component slurry gasification technology that is still in the state of technical improvement recently. Among them, different There are obvious differences in the gasification methods of gasification raw materials in phase state. Co-gasification of raw materials in different phases, such as co-gasification of pulverized coal and coal-water slurry, the gasifica...

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Problems solved by technology

This kind of mixed combustion of multi-phase raw materials into the gasifier at the same time is very prone to instability in the combustion process, which may lead to unstable composition of syngas or lower quality of syngas

When the above-mentioned unstable phenomenon occurs, it is necessary to try to adjust various raw materials one by one to obtain a relatively stable co-gasification process. This adjustment step is cumbersome, time-consuming and difficult.

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