An entrained bed gasifier

Abstract

The invention discloses an entrained-flow bed gasifier, relates to the technical field of gasifiers and achieves effective control on a hydrogen-enriched synthesis gas circulation quantity. The entrained-flow bed gasifier comprises a gasifier body and further comprises an inner flow guiding barrel and an outer flow guiding barrel, wherein the inner flow guiding barrel is fixedly arranged at the upper area in the gasifier body, an interval is formed between the upper part of the inner flow guiding barrel and a dome of the gasifier body, the outer flow guiding barrel sleeves the inner flow guiding barrel, the upper part of the outer flow guiding barrel is connected with the dome of the gasifier body, an interval is formed between a lateral wall of the outer flow guiding barrel and a lateralwall of the inner flow guiding barrel and is used for converging circulation synthesis gas for preheating hydrogen, and an interval serving as an outlet synthesis gas circulation channel is formed between the lateral wall of the outer flow guiding barrel and a lateral wall of the gasifier body; by means of effective obstruction of the outer flow guiding barrel, the circulation synthesis gas and the outlet synthesis gas cannot interfere each other; furthermore, the amount of the circulation synthesis gas entering a reaction space is favorable for being controlled; effective control on the hydrogen-enriched synthesis gas circulation quantity and high-efficiency preheating on the hydrogen are achieved in a powdered coal hydrogenating and gasifying process.

Description

technical field [0001] The invention relates to the technical field of gasification furnaces, in particular to an entrained-bed gasification furnace. Background technique [0002] Pulverized coal hydrogasification is a process in which coal and hydrogen react under high temperature and high pressure conditions to generate methane-rich gas, tar and semi-coke (incompletely reacted coal). At present, the pulverized coal hydrogasification process mainly uses an entrained bed reactor, and the selected gasification agent is hydrogen. The heat required for hydrogasification is provided by partial hydrogen combustion, and the residual hydrogen is preheated to a certain temperature to undergo hydrogasification reaction with coal powder. [0003] The existing technology uses partial hydrogen combustion to preheat the reaction hydrogen, which wastes a lot of precious hydrogen. This part of the hydrogen is separated and then returned to the gasifier to participate in the reaction. Ho...

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Problems solved by technology

[0003] The existing technology uses partial hydrogen combustion to preheat the reaction hydrogen, which wastes a lot of precious hydrogen. This part of the hydrogen is separated and then returned to the gasifier to participate in the reaction

However, the reaction is carried out in a high-temperature and high-pressure environment. During the separation and circulation process, the returned hydrogen needs to be heated and pressurized again. This process causes a lot of energy consumption and unnecessary heat loss.

In addition, in the current existing technology, there are technologies for preheating hydrogen by using the heat generated by the gasification of semi-coke at the bottom of the gasifier, and using the circulation of hydrogen-rich syngas to preheat hydrogen, but it is difficult to control the circulation into the reaction inner cylinder in actual operation The amount of high-temperature hydrogen-rich synthesis gas, which leads to the unsatisfactory preheating effect of the system on hydrogen

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