Oxygen-enrichment pulverized coal combustion method and combustor

Abstract

The invention relates to an oxygen-enrichment pulverized coal combustion method and a generalized oxygen-enrichment pulverized coal combustor. The oxygen-enrichment pulverized coal combustion method is characterized by comprising the steps of spraying pulverized coal into the combustor, spraying pure oxygen into an inlet of the combustor simultaneously to enable the oxygen concentration of the inlet of the combustor to rise remarkably (for example, reaching to 26%-32%), forming an oxygen-enrichment area at the inlet of the combustor to facilitate combustion of the pulverized coal, and forming a reduction area around a pulverized coal spraying outlet to prevent the generation of nitric oxide (NOx) caused by excessive oxygen. The oxygen-enrichment pulverized coal combustor comprise a primary air tube and a combustor body and further comprises an oxygen spraying-into device and an oxygen inputting pipe, wherein a spraying inlet of the oxygen spraying-into device is arranged at the position close to the input end of the primary air tube, and the oxygen input pipe is connected to the oxygen spraying-into device. Thus, the pulverized coal can be fully combusted by only adjusting pure oxygen sprayed into the combustor, the burn-off rate of the pulverized coal is improved, flying ash combustible of a boiler is reduced, the efficiency of the boiler is improved, and meanwhile NOx generation is controlled.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to an oxygen-enriched pulverized coal burner. Background technique [0002] At present, almost all large boilers at home and abroad are pulverized coal boilers. Pulverized coal combustion is a typical oxidation process. In order to ensure that pulverized coal can be fully combusted, a large amount of air is often blown in by a fan, which will increase the power consumption of the blower and increase the power consumption of the plant. At the same time, the wind blowing into the furnace will take away a large amount of boiler heat from the furnace, thereby reducing the efficiency of the boiler; more seriously, if the coal quality is too poor, after the coal powder enters the furnace, it is not easy to ignite and burn, and a large amount of residual carbon is in the furnace. Combustion in the upper part of the boiler causes overheating of the boiler tail, forcing more cooling water to be sp...

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Problems solved by technology

[0002] At present, almost all large boilers at home and abroad are pulverized coal boilers. Pulverized coal combustion is a typical oxidation process. In order to ensure that pulverized coal can be fully combusted, a large amount of air is often blown in by a fan, which will increase the power consumption of the blower and increase the power consumption of the plant. At the same time, the wind blowing into the furnace will take away a large amount of boiler heat from the furnace, thereby reducing the efficiency of the boiler; more seriously, if the coal quality is too poor, after the coal powder enters the furnace, it is not easy to ignite and burn, and a large amount of residual carbon is in the furnace. Combustion in the upper part of the boiler causes the tail of the boiler to overheat, and it is forced to spray more desuperheating water; at the same time, it will also increase the carbon content of the boiler fly ash, resulting in the above four energy losses

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