Kelly ultra-low nitrogen burner focuses on cutting-edge combustion technology, abandons the traditional external circulation of flue gas, and comprehensively adopts low nitrogen technologies such as vacuum internal mixing, ultra mixing, multi-channel staggered layer and positive and negative oxygen combustion, so as to realize the ultra-low nitrogen emission of nitrogen oxide less than 30 mg / m3 and meet the most stringent air pollutant emission standard at home and abroad.

At the two sessions, the government report clearly stated that "we will continue to improve environmental quality, improve the compensation mechanism for ecological protection, and carry out in-depth pollution prevention and control actions". In the report, it is required that the total emission of nitrogen oxides and volatile organic compounds should be reduced by more than 10% respectively during the 14th Five Year Plan period. In order to suppress the emission of nitrogen oxides, it is necessary to carry out environmental protection technical transformation of the boiler, in which the ultra-low nitrogen burner plays an important role.

Nitrogen oxides (NOx) are compounds composed of nitrogen and oxygen, the most important of which are no and NO2. A small amount of nitrogen oxides also exist in nature, but most of them come from transportation and energy production. During the combustion process, nitrogen oxides can be divided into three categories according to the causes of formation:

1. Thermal NOx: during combustion, nitrogen in the air is oxidized at high temperature to generate NOx;
2. Fast NOx: during combustion, nitrogen in the air reacts with hydrocarbon ion groups in the fuel to generate NOx
3. Fuel type NOx: NOx is generated by thermal decomposition and oxidation of nitrogen oxides in fuel during combustion.

The transformation of combustion equipment belongs to the pollution prevention technology in the combustion process. It is to meet the requirements of low nitrogen emission by replacing ultra-low nitrogen burner or implementing flue gas recirculation transformation. In terms of the current boiler transformation market, flue gas external circulation (FGR) technology is widely used; While reducing NOx emission, this technology may bring negative effects such as insufficient combustion of fuel and furnace coking.

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