Dry pulverized coal cyclone entrained flow bed gasification furnace and gasification method thereof

Abstract

The invention relates to a dry pulverized coal cyclone entrained flow bed gasification furnace and a gasification method thereof, which belong to the technical field of coal gasification device. The dry coal dust cyclone entrained flow bed gasification furnace comprises a top nozzle, a furnace roof, a gasification chamber, an exhaust port and a bottom slag discharge port. The top nozzle is an annular channel structure with inner, outer swirl vanes, at least one layer of a tangential O2 nozzle is arranged on the lateral wall of the gasification chamber. Pulverized coal gas flow and vapor are fed through a top nozzle in a whirling way, and the pulverized coal gas flow rotating downwards is formed in the near-wall area. The pulverized coal particles are subjected to film type gasification on a liquid slag film formed on the surface of the furnace wall under the centrifugal action of the high-speed rotation gas flow. The service life of the nozzle is effectively prolonged, the residing time of the pulverized coal in the furnace is increased, and the carbon conversion efficiency is increased; liquid slags reside on the wall surface, so as to effectively protect the wall surface; the multiple layers of the tangential O2 nozzles are arranged to effectively disperse heat load and the work reliability of the gasification furnace is increased.

Description

technical field [0001] The invention relates to a cyclone entrained-bed gasifier and a gasification method thereof, in particular to a dry coal powder cyclone-entrained-bed gasifier, which belongs to the technical field of coal gasification equipment. Background technique [0002] Coal gasification technology is the development of coal-based chemical production, coal-based liquid fuels (synthetic oil, methanol, dimethyl ether, etc.), synthetic natural gas (SNG), IGCC power generation, hydrogen production, fuel cells, direct reduction ironmaking and more The basis of process industries such as cogeneration systems is the common technology, key technology and leading technology of these industries. The coal gasification process is generally divided into three types: moving bed (also known as fixed bed), fluidized bed and entrained bed. Among them, entrained bed gasification technology has become the main development direction of modern coal gasification technology due to its ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dry coal powder cyclone entrained-bed gasification furnace and its gasification method, while not reducing the economical efficiency of entrained-bed gasification, and solve the problem that the service life of the nozzle of the existing dry coal powder gasifier is not long and liquid slag film instability, improve the reliability of the coal gasification process

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