A pulverized coal furnace semi-coke heat carrier system and method for preventing boiler contamination

Abstract

The invention relates to a carbocoal heat carrier system and method for preventing a pulverized coal furnace from contamination. The carbocoal heat carrier method for preventing the pulverized coal furnace from contamination comprises the following steps: through a heating lift pipe, a hot carbocoal groove and a pyrolysis reactor, a system for combing carbocoal heat carrier raw coal pyrolysis and a pulverized coal furnace is formed; the raw coal is firstly blended with high-temperature carbocoal in the pyrolysis reactior, so as to enable the volatilizable alkali chloride to be volatilized in the pyrolysis gas; therefore, the content of alkali metal entering the pulverized coal furnace is reduced and the combustion of the alkali metal in flue gas is reduced; the contamination condition of the convection heating surface is fundamentally solved or greatly alleviated; meanwhile, the pyrolysis gas collects sodium resources via a purification device; purified pyrolysis gas and purified tar oil are blown to the pulverized coal furnace for combustion; the combustible components in the coal are effectively utilized; the combustion efficiency of the pulverized coal furnace is ensured.

Description

technical field [0001] The invention relates to the technical field of pulverized coal furnaces, in particular to a pulverized coal furnace 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%. The pulverized coal furnace has the advantages of rapid combustion, complete combustion, large capacity, high efficiency, wide adaptability to coal types, and easy control and adjustment. When burning high-alkaline coal types, the alkaline compounds in the coal will Volatile, it is 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 r...

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Problems solved by technology

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

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