Combustion method for effectively reducing boiler furnace slagging and high-temperature corrosion

Abstract

The invention provides a combustion method for effectively reducing boiler furnace slagging and high-temperature corrosion. The combustion method comprises the steps that S1, a boiler furnace is divided into a main combustion area and a burn-out area from bottom to top; S2, two strands of pulverized coal airflow with a large concentration difference are injected into the furnace; S3, primary air and over fire air are sprayed in through a furnace nozzle; and S4, a first-stage amino reducing agent and a second-stage amino reducing agent are sprayed into the main combustion area and the burn-out area correspondingly. According to the combustion method for effectively reducing boiler furnace slagging and high-temperature corrosion, the problems that in the prior art, a good low NOx emission effect is achieved, after the overall air amount of the main combustion area is reduced, pulverized coal combustion is carried out in a reducing atmosphere, a melting point of coal ash is reduced, combustors are arranged in a centralized mode, the pulverized coal combustion temperature is high, the slagging condition of the water-cooled wall of the boiler furnace is deteriorated, and the high-temperature corrosion of the water-cooled wall is intensified are solved.

Description

technical field [0001] The invention belongs to the technical field of electric power energy, and in particular relates to a combustion method for effectively reducing boiler furnace slagging and high-temperature corrosion. Background technique [0002] Power energy is mainly coal-fired thermal power generation. Most of the power coal used in my country is low-grade and inferior coal. Slagging in the furnace during boiler combustion is a long-term problem that has plagued the operation of power plants. Currently, the burners are arranged in a centralized manner, and the pulverized coal combustion temperature If the temperature is higher, the slagging of the water wall of the boiler furnace will deteriorate, and the high temperature corrosion of the water wall will intensify. The research shows that the slagging of the boiler is due to the flue gas with a temperature higher than the ash melting point washing the heating surface of the boiler, and the molten ash in the flue gas ...

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Problems solved by technology

[0003] The existing technology has achieved a good low NOx emission effect, but after reducing the overall air volume in the main combustion area, the pulverized coal combustion is carried out in a reducing atmosphere, the ash melting point of the coal ash is lowered, and the burners are arranged in a centralized way, and the pulverized coal combustion The temperature is higher, the slagging of the water wall of the boiler furnace deteriorates, and the high temperature corrosion of the water wall intensifies

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