Regulation system and method for preventing fire extinguishing caused by sudden increase in pressure of cold ash hopper of coal-fired boiler

Abstract

The invention discloses an adjustment system and method for preventing fire extinguishing caused by sudden pressure increase of the cold ash hopper of a coal-fired boiler. The upper dilution bellows, pressure relief safety valve and lower dilution bellows are respectively arranged in the cold ash hopper area from top to bottom along the height direction. The dilution bellows and the lower dilution bellows are divided into multiple dilution bellows by the dilution bellows. The air volume of each dilution bellows is independently controlled by the flow control valve on the connecting pipe of the bellows. The flue gas sampling pipe is connected to the flue gas measuring device, and the flue gas measuring device communicates with the control system. The invention can automatically control the CO gas content in different areas of the cold ash hopper through the dilution air, and effectively avoid the fire extinguishing accident caused by the sudden increase in the pressure of the boiler cold ash hopper caused by the deflagration of the CO gas; Relieve the pressure in the furnace to prevent fire-fighting accidents caused by the sudden increase in the pressure of the boiler's cold ash hopper due to coke loss in the furnace.

Description

technical field [0001] The invention relates to an adjustment system and method for preventing fire extinguishing caused by a sudden increase in the pressure of a cold ash hopper of a coal-fired boiler, and is used to improve the safety and reliability of the operation of the boiler unit. Background technique [0002] In recent years, in order to meet the NOx emission requirements, the power plants have carried out low-nitrogen burner transformation, and adopted staged, low-oxygen combustion methods. After continuous optimization and improvement, the NOx emission value of the boiler has reached the environmental protection requirements, but it has also brought many Negative problems, especially the coking of boilers and the surge of CO generation, etc., are more prominent, and their adverse effects on boilers are mainly manifested in the following two aspects: [0003] (1) The pressure of the cold ash hopper increases suddenly due to the loss of coke in the boiler, which lea...

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Problems solved by technology

[0008] In order to solve the deficiencies in the prior art, the present invention discloses an adjustment system and method for preventing fire extinguishing caused by a sudden increase in the pressure of the cold ash hopper of a coal-fired boiler. The present invention can not only control the concentration of CO gas in different areas of the cold ash hopper through dilution , to prevent CO gas deflagration, and can also solve the problem of sudden increase in the pressure of the cold ash hopper caused by coke loss through the pressure relief safety valve, effectively avoiding the occurrence of boiler fire extinguishing accidents, and greatly improving the economy and safety of unit operation

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