Twice combustion supporting and coal saving method for coal fired boiler

Abstract

The invention discloses a twice combustion supporting and coal saving method for a coal fired boiler. According to the twice combustion supporting and coal saving method for the coal fired boiler, a high-sulfur coal composite combustion supporting agent and a low-sulfur coal combustion supporting agent are added by a movable combustion coal auxiliary ejector; the high-sulfur coal composite combustion supporting agent is added before coal combustion, and the low-sulfur coal composite combustion supporting agent is added during coal combustion; for the prime cost of coal and the characteristics of the coal fired boiler, a twice combustion supporting method is adopted, first-time combustion supporting is implemented by mixing the high-sulfur coal composite combustion supporting agent with coal briquettes and coal powder to solve the problems caused by the coal components, and second-time combustion supporting is implemented by ejecting the low-sulfur coal composition combustion supporting agent into the boiler for the combustion areas and the combustion states of the furnace structures of the different boilers; controlled ejecting combustion supporting is conducted through optimal effect parameters. Through the twice combustion supporting mode of the method, the combustion supporting effect of the composite combustion supporting agents is greatly improved, and the coal saving and emission reducing effects are further achieved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired boilers, in particular to a coal-saving method for secondary combustion of coal-fired boilers. Background technique [0002] Coal-fired boilers, especially small and medium-sized coal-fired boilers, basically face two major problems. One is that the heat conversion efficiency of coal is low, and the residual carbon content of its fly ash reaches more than 8%, and some are as high as 12%. Dust emissions, sulfides and nitrides are generally seriously exceeded. The existing coal-fired boiler additives and combustion-supporting methods are mainly to mix leavening agents, oxidants, catalysts, desulfurizers, smoke suppressants, and other organic additives with water to form a composite combustion additive, and then take it with coal and coal powder. Combustion is carried out by mixing. [0003] The existing technology lacks pertinence to coal raw materials, and the active components of the formed c...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a coal-fired boiler secondary combustion coal-saving method, aiming to solve the lack of pertinence of coal raw materials in the prior art, so that the coal raw materials cannot be fully combusted, and at the same time cause soot, carbon monoxide, nitrogen monoxide, The generation of pollution such as nitrogen dioxide, the effective components of the composite combustion enhancer cannot be fully utilized, which affects the effect of coal combustion, resulting in waste of production costs, single combustion method, and failure to achieve effective emission reduction.

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