Coal gasification reaction device

Abstract

The invention discloses a coal gasification reaction device, which comprises a fluidized bed gasification furnace, a gas solid separation device and a material return pipe, wherein the fluidized bed gasification furnace comprises a furnace body and an exhaust pipe arranged on the furnace body; the exhaust pipe is used for guiding raw gas generated through coal gasification reaction in the furnacebody into the gas solid separation device; the gas solid separation device is used for separating flying ash in the raw gas; the material return pipe is used for returning the flying ash separated bythe gas solid separation device into the furnace body; a center jet pipe is arranged at the bottom of the furnace body; the center jet pipe is used for providing steam and oxygen gas required by flying ash gasification. The coal gasification reaction device is characterized in that a spherical cap is arranged at an outlet part of the center jet pipe; a plurality of air holes are formed in the spherical cap; the spherical cap and the center jet pipe are detachably connected.

Description

technical field [0001] The invention relates to a reaction device, in particular to a coal gasification reaction device. Background technique [0002] Coal gasification technology refers to sending properly treated coal into a reactor such as a gasifier, at a certain temperature and pressure, through a gasification agent (air or oxygen and steam) in a certain flow mode (moving bed, fluid flow). bed or entrained bed) into gas to obtain crude water gas, and refined carbon monoxide gas can be obtained through subsequent desulfurization and decarbonization processes. Fluidized bed gasification technology is a kind of coal gasification technology. It uses small particles of coal with a particle size of 0-10mm as the gasification raw material, which is suspended and dispersed in the vertically rising airflow in the gasifier. The gasification reaction is carried out in the boiling state, so that the temperature in the coal material layer is uniform, easy to control, and the gasifi...

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Problems solved by technology

[0003] However, in the fluidized bed process, the generated gas entrains the fly ash with high carbon content, and if the fly ash is not treated, energy will be wasted

In the prior art, fly ash is processed by sending it back to the gasifier through the ash return system for re-gasification. For example, a coal gasification reaction device, the patent number is CN201520048964.3. In this patent technology, the fly ash The fly ash gasification zone at the bottom of the gasification furnace is introduced from the anti-ash unit for secondary gasification. The temperature and gas velocity of the fly ash gasification zone are higher than those in the gasification reaction zone, and the fly ash can be fully gasified, and The fly ash gasification zone is under negative pressure, and the fly ash enters the gasification furnace more easily. However, if the gas velocity in the fly ash gasification zone is too high, it is easy to bring the fly ash to the gasification reaction zone, and the fly ash in the fly ash gasification zone Short residence time, resulting in low fly ash conversion

Moreover, the gasification agent enters from the bottom of the reaction device, passes through the high-temperature fly ash gasification zone, and the temperature of the gasification agent reaching the bottom of the gasification reaction zone is higher than that of the gasification reaction zone. High and prone to slagging

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