Method for preventing slagging based on design angle of boiler

Abstract

The invention relates to a method for preventing slagging based on the design angle of a boiler. The method comprises the steps: selecting hearth thermal parameters which can reduce the temperature level of a burner area, make the heat load in the boiler uniform and ensure that pulverized coal has sufficient residence time in the upper part of a hearth to burn out, adopting a square large cut-angle hearth or a large cut-angle hearth that tends to a square, selecting an appropriate burner type and a nozzle arrangement type, reducing the imaginary tangent circle diameter of a burner, the thermalpower of a single primary air nozzle of the burner and the ratio of primary to secondary air momentum, having a good aerodynamic working condition in the boiler, and preventing the air flow with powder from leaning against a wall. The method improves the safety and reliability of boiler operation.

Description

technical field [0001] The invention belongs to the technical field of safe operation of thermal power plants, and in particular relates to an anti-slagging method based on a boiler design angle. Background technique [0002] Slagging is mainly formed by the molten or partially melted particles entrained in the flue gas colliding with the furnace wall, water cooling wall or pipes and being cooled and solidified. The form of slagging is mainly in the form of viscous or molten sediment. Appears on radiant heating surfaces. [0003] In recent years, in order to save fuel costs, many power plants in my country have burned a large amount of low-quality coal, especially high-sulfur and high-alkali coal, which has aggravated the phenomenon of boiler slagging. Severe slagging will have a negative impact on the safety and economy of boiler operation. Therefore, there is a need for a method of preventing slagging from a boiler design perspective. Contents of the invention [0004]...

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Problems solved by technology

[0003] In recent years, in order to save fuel costs, many power plants in my country have burned a large amount of low-quality coal, especially high-sulfur and high-alkali coal, which has aggravated the phenomenon of boiler slagging, and serious slagging will have a negative impact on the safety and economy of boiler operation.

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