Method and device capable of preventing power station boiler slagging

Abstract

The invention discloses a method and device capable of preventing power station boiler slagging. The method capable of preventing power station boiler slagging comprises the steps of S1, presetting optimal excess air coefficients of a power station boiler under different loads; S2, inputting pulverized coal l meeting the preset pulverized coal fineness need; S3, judging whether the current excessair coefficient meets the optimal excess air coefficient corresponding to the current load in the power station boiler running process, if yes, continuing work with the current running state, and if not, the S4 is executed; S4, stopping boiler running, and adjusting the running state of the boiler, starting the power station boiler and executing the S3. Generation of boiler coking can be prevented, heat transfer resistance of the boiler heating face is reduced, coal consumption is reduced, the boiler heat economy is improved, meanwhile, through online analysis of the change tendency of the outlet pulverized coal finenesses of a coal grinding machine, the pulverized coal fineness is subjected to closed-loop control within the preset range, and pulverized coal fineness and uniformity stableoutput is achieved.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a method and a device for preventing slagging of power plant boilers. Background technique [0002] Power plant boilers use coal and other fossil fuels as energy sources, and their combustion products contain a large amount of ash, sulfur and nitrogen oxides and other substances. The operation mode of power plant boilers determines that it will inevitably produce ash pollution during operation. Due to the extremely high temperature of the internal flame, which usually exceeds the ash melting point of coal ash, the fly ash in the molten state is easy to adhere to the temperature A slag layer that is extremely difficult to remove is formed on the lower water wall, which affects the heat transfer performance of the boiler. In severe cases, the temperature of the water wall may be too high, causing serious accidents such as tube burst and shutdown. [0003] Because the temper...

AI Technical Summary

Problems solved by technology

The operation mode of power plant boilers determines that it will inevitably produce ash pollution during operation. Due to the extremely high temperature of the internal flame, which usually exceeds the ash melting point of coal ash, the fly ash in the molten state is easy to adhere to the temperature The slag layer that is extremely difficult to remove forms on the lower water wall, which affects the heat transfer performance of the boiler. In severe cases, the temperature of the water wall may be too high, causing serious accidents such as tube burst and shutdown

[0003] Because the temperature inside the boiler is extremely high and there are problems such as fly ash erosion in the flue gas, it cannot be monitored by direct measurement. Usually, power plant boilers usually use regular and quantitative soot blowing to remove furnace slagging, but there is a lack of The problem of intuitive monitoring data will lead to soot blowing and slagging, soot blowing is not timely and the heat transfer efficiency is reduced, or soot blowing is too frequent and steam is wasted too much

As a result, a large amount of human and material resources are wasted, and a technology to prevent power plant boilers from slagging and ash accumulation is urgently needed to solve the above problems

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