Adjusting system and method for preventing fire extinguishing caused by pressure jump of dry bottom hopper of coal-fired boiler

Abstract

The invention discloses an adjusting system and method for preventing fire extinguishing caused by a pressure jump of a dry bottom hopper of a coal-fired boiler. An upper dilution bellows, pressure relief safety valves and a lower dilution bellows are arranged in the region of the dry bottom hopper in the height direction from top to bottom. The upper dilution bellows and the lower dilution bellows are each divided into a plurality of dilution air bins by dilution air bin partitions. The air volume of each dilution air bin is controlled by a flow adjusting valve on a bellows communication tube independently. Smoke measuring devices are connected to water cooled walls of coverage regions of the dilution air bins through smoke sampling tubes and communicate with a control system. According to the adjusting system and method, the content of CO gas in different regions of the dry bottom hopper can be controlled automatically through dilution air, and the fire extinguishing accident caused by the pressure jump of the dry bottom hopper of the boiler due to deflagration of the CO gas is effectively prevented; meanwhile, pressure relief can be performed on a hearth in time through the pressure relief safety valves in the region of the dry bottom hopper, and the fire extinguishing accident caused by the pressure jump of the dry bottom hopper of the boiler due to coke dropping of the hearth is prevented.

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...

AI Technical Summary

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

Images