Impingement flow partially premixed low nitrogen gas burner

Abstract

The invention relates to an impinging stream part pre-mixing low-nitrogen gas combustor. The impinging stream part pre-mixing low-nitrogen gas combustor comprises a combustion head. The combustion head comprises a cylindrical air runner, a whirlcone arranged in the cylindrical air runner and fuel spraying pipes. The whirlcone comprises an outer ring, an inner ring, spinning disks arranged between the outer ring and the inner ring, and a center bluff body arranged in an inner center hole. The fuel spraying pipes are arranged on the outer side of the combustor whirlcone and located in the cylindrical air runner. Each fuel spraying pipe comprises a fuel pipe and a fuel spraying opening formed in the side face of the fuel pipe.

Description

technical field [0001] The invention relates to a low-nitrogen gas burner, in particular to a partly premixed low-nitrogen gas burner with impinging flow. Background technique [0002] Nitrogen oxide (NOx) is one of the main pollution sources of the atmosphere. It can not only form acid rain or acid fog, but also an important precursor of PM2.5 secondary particulate matter. As environmental pollution continues to intensify, smog and haze frequently appear in key areas of our country, which has caused great harm to people's health. With the combustion and utilization of natural gas, petroleum liquefied gas and coal synthesis gas, the pollution of gas combustion, especially the reduction of NOx emissions, is an urgent task. Therefore, it is of great significance to control the production of NOx during the combustion of natural gas. [0003] Combustion theory divides the formation of NOx into thermal NOx, rapid NOx and fuel NOx. The nitrogen content in natural gas is low, an...

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Problems solved by technology

[0008] According to the development stage of low-nitrogen combustion industrial application technology, it can be roughly divided into three development stages: first, the use of staged combustion technology can control the NOx emission concentration at 100mg / m 3 , but this technology may cause a significant increase in the concentration of CO emissions; second, the use of flue gas recirculation technology can control the emission concentration of NOx at 60~80mg / m 3 According to the flue gas circulation ratio, the emission level varies greatly. This technology has a low cost and is suitable for renovation and upgrading, but it has no effect on the control of fast NOx and increases the power consumption of the fan; third, the premixed combustion technology , can control the emission concentration of NOx to 10~60mg / m 3 , can be adjusted within a certain range according to the requirements of environmental protection standards. This technology has a low cost and is suitable for new projects, but it has a slight impact on the overall thermal efficiency (about 1~2% in terms of low calorific value), that is, NOx emissions The lower the concentration, the lower the thermal efficiency, and there are also safety issues

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