Slag removal system and method thereof

Abstract

The invention relates to the field of coal gasification technology, especially to a slag removal system and a method thereof. According to the invention, distribution of flow field around a slag removal pipe can be improved, instability and obstruction of slag removal due to uneven distribution of flow field are avoided, and potential safety hazards such as abrasion of a central jet pipe, etc. canbe avoided. The slag removal system comprises a gasifier, the bottom of which is provided with a gas distribution plate. A gas distribution plate zone is above the gas distribution plate. The bottomof the gas distribution plate extends downward to provide with a slag removal pipe, which penetrates through the bottom of the gasifier. A columnar slag removal channel which is communicated with thegas distribution plate zone is formed at the bottom of the gasifier and is communicated with a slag hopper system through a connection pipe nipple. One end of the connection pipe nipple, close to theslag removal pipe, is provided with an annular gas distributor, which is used for distributing gas to the gas distribution plate zone through the columnar slag removal channel. A swirl flow field is formed in the gas distribution plate zone, and ash and slag fall down under the action of the swirl flow field and are discharged through the slag hopper system.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a slag discharge system and method. Background technique [0002] Coal catalytic gasification technology is an important way of clean and efficient utilization of coal, and it is one of the most efficient gasification technologies for coal-to-natural gas. That is, coal is gasified with a gasifying agent composed of water vapor, hydrogen and carbon monoxide under a certain pressure and temperature under the catalytic action of a catalyst to generate high-concentration methane. [0003] The catalytic coal gasification process is usually carried out in a fluidized bed gasifier, see figure 1 As shown, the bottom of the fluidized bed gasification furnace 1 is provided with a conical gas distribution plate 11 and a central jet pipe 12, and the bottom of the conical gas distribution plate 11 is extended downward with a slagging pipe 13, and the slagging pipe 13 passes throug...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a slag discharge system and method, which can improve the flow field distribution around the slag discharge pipe and avoid the occurrence of unstable slag discharge and unsmooth slag discharge caused by uneven flow field distribution. And can avoid safety hazards such as wear of the central jet tube

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