Side over fire air distribution method and coal-fired boiler

Abstract

The invention relates to the technical field of pulverized coal combustion of a large-scale coal-fired power plant boiler, and concretely relates to a side over fire air distribution method and a coal-fired boiler. Aiming at the defects such as large combustion heat loss, poor unit operation economy and high temperature corrosion of a water cooled wall caused by poor side over fire air supplying of an existing domestic coal-fired power plant boiler, the invention provides the side over fire air distribution method and the coal-fired boiler. The air distribution method is characterized in that hot primary air in a hot primary air bus pipe is used as an air source, air is fed to a side over fire air area of the coal-fired boiler, the fed hot primary air can deeply penetrate through flue gas, and incompletely combusted pulverized coal and generated combustible gases such as carbon monoxide are continuously combusted sufficiently, so that incomplete combustion heat loss of the boiler is reduced, the combustion efficiency of the boiler is improved, meanwhile, an after-combustion effect of the over fire air is improved, a trend of the high temperature corrosion occurred on the water cooled wall between a main combustor and the over fire air is alleviated, and the operating economy and the safety of the coal-fired boiler adopting the air distribution method are greatly improved.

Description

[0001] Technical field [0002] The invention relates to the technical field of pulverized coal combustion of large-scale coal-fired power plant boilers, in particular to a method for distributing side-burned air and a coal-fired boiler. Background technique [0003] In the actual operation of large-scale power plant boilers, the air distribution method in the furnace will directly affect the combustion status of pulverized coal in the boiler furnace. positive improvement. At present, the swirling flow burners of large coal-fired power plant boilers basically adopt the front and rear wall hedging arrangement, and the old and newly built units modified by the burners in China basically adopt the air staged combustion technology. After the coal-fired power plant boiler adopts the air staged combustion technology, it is often difficult to continue to burn the pulverized coal completely, and it will produce unburned combustible gases such as carbon monoxide, which increases the h...

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Problems solved by technology

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defects of the existing domestic coal-fired power plant boilers such as large combustion heat loss due to poor burnout effect, poor operating economy of the unit, and high-temperature corrosion of the water wall, and provide a side-fired boiler. The exhaust air distribution method and the coal-fired boiler, the air distribution method can effectively reduce the incomplete combustion heat loss of the boiler, improve the combustion efficiency of the boiler, and at the same time improve the burnout effect of the exhaust air, and reduce the distance between the main burner and the exhaust air. The trend of high-temperature corrosion of the intermediate water-cooled wall, the operation economy and safety of the coal-fired boiler using this air distribution method are greatly improved

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