A fluidized bed semi-coke heat carrier system and method for preventing boiler fouling

Abstract

The present invention relates to a fluidized bed semi-coke heat carrier system and method for preventing boiler contamination. Combined system, the raw coal is first mixed with high-temperature semi-coke in the pyrolysis reactor for high-temperature pyrolysis, so that the volatile alkali metal chlorides can be volatilized into the pyrolysis gas, thereby reducing the alkali metal in the fluidized bed furnace coal content, and then reduce the alkali metal in the combustion flue gas, which can fundamentally solve or greatly reduce the contamination of the convective heating surface. At the same time, the pyrolysis gas is collected through the purification device to collect sodium resources, and the purified pyrolysis gas and tar are sent to the Combustion in a fluidized bed effectively utilizes combustible components in coal to ensure boiler combustion efficiency.

Description

technical field [0001] The invention relates to the field of fluidized bed technology, in particular to a fluidized bed semi-coke heat carrier system and method for preventing boiler contamination. Background technique [0002] my country's power generation industry is dominated by thermal power generation, with thermal power installed capacity exceeding 70%. Circulating fluidized bed combustion technology has the advantages of low pollution control cost, wide fuel applicability, and large load adjustment range. When burning high-alkaline coal, the alkaline compounds present in the coal will be volatilized during the combustion process. , easy to condense on the heating surface of the boiler to form sintered or bonded ash deposits, causing corrosion, slagging and contamination of equipment on the heating surface of the boiler. Slagging and contamination will reduce the heat transfer efficiency of the boiler, affect the output of the boiler, and seriously reduce the operatin...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fluidized bed semi-coke heat carrier system and method for preventing boiler contamination, which can effectively solve the contamination problem of the convective heating surface of the existing power plant boiler, reduce the difficulty of boiler heating surface layout, and ensure that the boiler heating surface Sufficient heat exchange and stable boiler output; avoid overheating of the convective heating surface caused by contamination, greatly reducing the occurrence of tube explosion accidents; realize large-scale pure combustion utilization of high-alkaline coal without affecting the combustion efficiency of the boiler

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