Early-warning adjustment system and early-warning adjustment method for preventing detonation of large-scale power station pulverized-fuel boiler furnace

Abstract

The invention relates to an early-warning adjustment system and an early-warning adjustment method for preventing detonation of a large-scale power station pulverized-fuel boiler furnace. The purposes of early warning and eliminating detonation can be achieved by the following steps: arranging CO concentration detecting points on a wall surface of a cooled ash bucket and additionally arranging a near-wall air supply system; feeding CO signals back to a DCS (Distributed Control System); controlling a near-wall air adjusting valve by the DSC according to the feedback of the CO signals; and feeding secondary hot air from an air preheater to an area of the cooled ash bucket in a four-wall tangential way to reduce the concentration of the CO. The warning adjusting system provided by the invention has significance in safety of a large-scale power station pulverized-fuel boiler.

Description

technical field [0001] The invention belongs to the safety field of large-scale power station boilers, and in particular relates to a large-scale power station pulverized coal boiler furnace deflagration early warning monitoring system and an adjustment method. Background technique [0002] In recent years, on the one hand, coal prices have continued to rise, and on the other hand, electricity prices have been subject to macro-control by the state, and power generation companies are under increasing pressure. In order to control the cost of power generation, many power plants have to purchase a large amount of coal from small kilns. However, the instability of the incoming coal channel directly leads to frequent changes in the quality of the coal used, which deviates far from the designed coal type, which in turn leads to large fluctuations in the combustion pressure in the furnace, and frequent accidents such as "deflagration" and "fire extinguishing". Deflagration in the ...

AI Technical Summary

Problems solved by technology

However, the instability of the incoming coal channel directly leads to frequent changes in the quality of the coal used, which deviates far from the designed coal type, which in turn leads to large fluctuations in the combustion pressure in the furnace, and frequent accidents such as "deflagration" and "fire extinguishing"

Deflagration in the furnace often causes large fluctuations in pressure, and in serious cases directly forces the automatic response of the shutdown of the furnace, sudden load shedding of the unit and other major safety accidents

The fire extinguishing in the furnace may cause the deformation of the water-cooled wall tubes, or cause accidents such as tube explosion and furnace wall breakage, and the sudden shutdown of the unit will also bring a huge impact on the power grid.

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