Gray melting poly-fluid bed powder coal gasification method

Abstract

An ash agglomerating fluidized bed gasification method is provided. First, the coal powder is added in a gasification furnace; the gasification agent enters the bottom of the gasification furnace through a nozzle of a gas distributor, a central tube and a ring canal to make the coal powder gasified to produce gas under the fluidization state; the gas enters a first dust collector cyclone and a secondary dust collector cyclone after entering a first steam generator from the top of the gasification furnace, and enters a secondary steam generator to produce the saturated steam and enters a steam superheater and a boiler feed water preheater to continuously recycle the after heat of the gas, and then enters a final washing and cooling tower of the gas to further remove dust and reduce temperature and send to a follow-up system after dust removal via a deduster. The invention adopts the theory of fluidization to add the powder coal of the raw materials continuously in the dense phase of the gasification furnace. The gasification agent is blown in from the bottom of the gasification furnace to make the coal particle boiled and fluidized. The gas phase and solid phase are fully mixed and contact under the high temperature caused by combustion to carry out the thermolysis and the viscosity of the coal and the oxidation-reduction reaction of the carbon to realize the complete gasification of the coal finally.

Description

technical field [0001] The invention relates to a fluidized bed coal gasification method, in particular to an ash fusion and agglomeration fluidized bed pulverized coal gasification method. Background technique [0002] Coal gasification technology can be divided into fixed bed (such as UGI furnace, Lurgi furnace, etc.), fluidized bed (such as HTW furnace, U-gas furnace, etc.), entrained bed (such as K-T furnace, Texaco furnace, Shell furnace, etc.) Three categories. [0003] Fixed-bed gasifiers generally use lump coal as raw material, and the screening range is 6-50mm. Coal and gasification agent flow in reverse in the furnace. Solid-phase raw materials are added from the upper part of the gasifier, and gasification agent is fed from the bottom of the gasifier. Blowing in, the ash containing a certain amount of residual carbon is discharged from the bottom of the furnace, and the gas produced contains hydrocarbons and tar. [0004] In the entrained bed gasification furnac...

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Problems solved by technology

The production capacity of atmospheric pressure gasification technology is low, and the compression energy consumption required by the subsequent system is high

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