Double-channel combustor with thick pulverized coal and thin pulverized coal being separated and use method thereof

Abstract

The invention relates to a double-channel combustor with thick pulverized coal and thin pulverized coal being separated and a use method thereof. The double-channel combustor with the thick pulverizedcoal and the thin pulverized coal being separated comprises a pulverized coal supplying mechanism, a transition channel, an internal secondary air guide duct, an external secondary air guide duct, acombustion stabilizing cavity and a rectifying cavity. The external secondary air guide duct, the combustion stabilizing cavity and the rectifying cavity are sequentially connected. The pulverized coal supplying mechanism comprises an air-pulverized coal pipe and a thick and thin pulverized coal separating device. The air-pulverized coal pipe communicates with the combustion stabilizing cavity. The thick and thin pulverized coal separating device is detachably connected to the air-pulverized coal pipe. The internal secondary air guide duct is coaxially arranged in the outer secondary air guideduct in a spaced manner. The transition channel is coaxially arranged in the internal secondary air guide duct in a spaced manner. The outlet end of the internal secondary air guide duct forms an expanded opening. The angle of the expanded opening is identical with the angle of the combustion stabilizing cavity. By the adoption of the double-channel combustor with the thick pulverized coal and the thin pulverized coal being separated, air can be divided into internal secondary air and external secondary air to respectively enter the combustor, the internal secondary air is combined with the transition channel to sufficiently mix pulverized coal and air, the external secondary air can form a cooling air layer flowing along the wall face of the combustion stabilizing cavity in the combustion stabilizing cavity, and the wall face of the combustion stabilizing cavity is protected against ash accumulation and coking.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a dual-channel thick-thin separation burner and its use method, belonging to the technical field of efficient and clean utilization of coal. Background technique [0002] At present, in the field of pulverized coal industrial boilers, a variety of burners such as blunt body burners, swirl burners, and reverse injection burners have appeared. The purpose of high-efficiency and low-nitrogen combustion of pulverized coal. However, due to the violent combustion of pulverized coal in the burner, the temperature inside the burner can reach above 1100°C, and the burner is in the high-temperature combustion zone for a long time, so there is a phenomenon of high-temperature thermal corrosion; and compared with the chain furnace, the pulverized coal industrial boiler And circulating fluidized bed, there is a narrow range of load adjustment and the problem of low burnout rate is prone to occur d...

AI Technical Summary

Problems solved by technology

However, due to the violent combustion of pulverized coal in the burner, the temperature inside the burner can reach above 1100°C, and the burner is in the high-temperature combustion zone for a long time, so there is a phenomenon of high-temperature thermal corrosion; and the pulverized coal industrial boiler is compared with the chain furnace And circulating fluidized bed, there is a narrow range of load regulation and low burnout rate is easy to appear in the process of low load operation

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