Coal dry powder gasification device

Abstract

The invention relates to a coal dry powder gasification device comprising a multi-channel sleeve pipe top nozzle and a plurality of side nozzles. The sleeve pipe top nozzle comprises: an inner sleeve pipe used for introducing coal dry powder loaded by CO2, N2, and / or inert gas; a middle sleeve pipe used for introducing oxygen, water, and / or water vapor; and an outer sleeve pipe used for introducing carbon-dioxide-rich gas. The inner sleeve pipe, the middle sleeve pipe, and the outer sleeve pipe are coaxially arranged on the top of the dry powder gasification device. The plurality of side nozzles are uniformly and eccentrically arranged along the periphery near a middle part of the side wall of the dry powder gasification device, and are used for introducing carbon-dioxide-rich gas with a cyclone manner. With the carbon-dioxide-rich gas introduced by the outer sleeve pipe and the side nozzles, an endothermic cooling flowing gas protective layer is formed between a central reaction zone of the gasification reaction of coal dry powder and a gasification agent and the inner surface of the wall of the dry powder gasification device. With the protective layer, central reaction zone temperature is not reduced, and furnace wall temperature is reduced, such that furnace wall service life is prolonged.

Description

technical field [0001] The invention relates to a dry coal powder gasification device, in particular to a dry coal powder gasification device which uses carbon dioxide-rich gas as a heat-absorbing and cooling protection gas and a gasification agent. Background technique [0002] In recent years, with the rapid advancement and development of industry, the contradiction between environmental degradation and industrial development has become increasingly prominent. In order to alleviate this contradiction, how to efficiently and cleanly utilize the huge consumption of coal resources has gradually become an important issue for improving the environment. In the prior art, it is an important way to cleanly and efficiently utilize coal resources by gasifying coal to obtain high calorific value coal gas from the generated synthesis gas. However, the syngas produced by coal gasification contains a large amount of carbon dioxide in addition to combustible coal gas. Therefore, how to ...

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Problems solved by technology

However, the effect of this dry powder gasification device in practical applications is not satisfactory, mainly due to two points: first, high-pressure carbon dioxide gas is blended with dry coal powder through pipeline 14, and is carried as carrier gas through dry coal powder nozzle 16 The dynamic dry coal powder is sprayed into the gasifier, which means that the carbon dioxide gas used as the carrier gas cannot form a layer of gas film wrapped in the dry coal powder; secondly, the reaction activity of carbon dioxide and coal is very poor, and the reaction proceeds The reaction speed of water vapor and coal is several times faster than that of the former, which makes the intense gasification reaction mainly concentrated in the collision area of ​​coal-water slurry in the middle of the gasifier, while the carbon dioxide entering from the top and dry coal powder The Boudiuard endothermic reaction of the carbon in the carbon mainly occurs at the top, which cannot effectively reduce the heat transferred to the furnace wall from other areas, especially the central area of ​​the gasification reaction.

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