Coal firing method with low discharged nitrous oxides

Abstract

The invention discloses a fire coal method to discharge low nitrogen oxide, which is characterized by the following: adopting high temperature oxygen-enriched smoke gas from circulating fluidized bed burner as high temperature low oxygen twice wind of pulverized coal fired boiler; burning coal dust in high temperature low oxygen coordinating wind with temperature at 800-950 deg. c; decreasing generated quantity of nitrogen oxide (NOx)greatly; controlling circulating fluidized bed burner and main combustion area of coal dust burner fire box at reducing atmosphere; controlling burning temperature; inhibiting the generation of NOx; keeping stability and complete burning property of burning; realizing low NOx discharge of boiler; decreasing the discharging quantity of NOx below 130mg / Nm3.

Description

technical field

[0001] The invention relates to the technical field of environmental protection, and relates to a coal burning method, in particular to a method for low pollutant discharge used in pulverized coal boilers. Background technique

[0002] During the combustion of coal, NO, NO 2 , N 2 Nitrogen oxides (NOx) including O. In order to reduce NOx emissions, a variety of low NOx coal combustion technologies have been developed. In the early days, the generation of NOx was mainly reduced through low-oxygen and low-temperature combustion in the furnace, and the low-oxygen combustion of the entire furnace was realized by reducing the oxygen at the furnace outlet. This technology has limited reduction in NOx emissions. The combustion process is delayed, and the content of fly ash combustibles increases. . Later, the air staged combustion technology became the mainstream technology, that is, low-oxygen combustion was used in the main combustion zone to suppress the form...