Secondary air distribution method for pulverized coal boiler with swirling combustion of front-back hedging

Abstract

The invention discloses a secondary air distribution method for a pulverized coal boiler with swirling combustion of front-back hedging. The method comprises the steps of establishing a mesh structure model of the boiler; according to the mesh structure model, establishing a mathematical model of each process formed during the pulverized coal combustion; according to the established mathematical model, simulating the process of the pulverized coal combustion; obtaining the proportion of an air volume with complete combustion in a total secondary air volume when the temperature field distribution in the boiler meets a preset index; and when the boiler is in operation, executing air distribution of the second air for the boiler according to the proportion of the air volume with complete combustion in the total secondary air volume. In addition, the invention further discloses a secondary air distribution system for the pulverized coal boiler with swirling combustion of front-back hedging. According to the method and the system provided by the invention, the problem that the accuracy caused by manual air distribution is not high to lead to unstable combustion inside the boiler is overcome, and the combustion efficiency of the boiler is improved. Meanwhile, the contaminants which are produced during the combustion process are greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of front-to-back swirling combustion pulverized coal boilers, in particular to a secondary air distribution method for front-to-back swirl combustion pulverized coal boilers and a secondary air distribution method for front-to-back swirling combustion pulverized coal boilers system. Background technique [0002] my country's energy structure will still be dominated by coal for a relatively long period of time. As a large amount of coal is used for power generation, the released NO X (nitrogen oxides) accounted for a large proportion of the country's total emissions, causing serious damage to the environment. Therefore, the NO in the boiler combustion process X Emissions should be kept as low as possible. As my country's coal has been over-exploited for a long time, coal reserves have begun to appear insufficient, and coal supply has become tense. Therefore, in reducing NO X How to burn fuel eff...

AI Technical Summary

Problems solved by technology

At present, the general method for the secondary air distribution of the front and back swirling combustion pulverized coal boilers is based on manual experience. Because the accuracy of manual experience is not high, sometimes it will cause unstable combustion in the furnace, resulting in the outlet of the burner being blocked. Burning out, or local heating surface coking, will cause boiler fire extinguishing in severe cases, reducing the safety and economical efficiency of the power plant; in addition, the current method cannot configure reasonable secondary air for the boiler, thus affecting the combustion efficiency of the boiler; And the way of artificial air distribution will cause a large amount of pollutants in the combustion process, causing great damage to the environment

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