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What are the technical ways of transforming low nitrogen burners?
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- Time of issue:2020-04-14 14:36
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What are the technical ways of transforming low nitrogen burners?
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The current mainstream Tianjin low-nitrogen transformation technology routes are as follows:
1. Staged combustion: Staged combustion technology is to send fuel and air into the furnace in stages. Fuel classification is to enter most of the fuel in the candle combustion area. The low-nitrogen transformation price can form a low-nitrogen reduction area at the end of the primary flame area. It has been formed The nitrogen oxides are partially reduced to nitrogen gas through this zone. Staged combustion technology can ensure full combustion of fuel and reduce the formation of nitrogen oxides in flue gas, which can reduce nitrogen oxide emissions by about 60%.
2. Burner premixing: The burner premixing process is as follows: before combustion, the fuel and oxygen are fully mixed in the burner, the premixed combustion temperature is high, the low nitrogen transformation scheme, the combustion intensity is high, the Tianjin low nitrogen transformation, the air-fuel ratio is carried out Control, realize the control of combustion temperature, and then control the generation of thermal nitrogen oxides. In terms of reducing the formation of nitrogen oxides, both complete Yuhuan combustion and partial combustion have great potential, which can reduce the formation of nitrogen oxides by about 85% compared with non-premixed combustion. However, premixed combustion has higher flammability and is lighter It will affect the service life of the burner, and it will bring disastrous consequences to the burner. This technology also causes a high excess air coefficient, which increases smoke loss and reduces boiler efficiency.
3. Flue gas recirculation: The technology of flue gas recirculation mainly refers to that part of the flue gas generated by the burner is cooled and then circulated into the combustion area, or mixed with air and sent to the combustion area, thereby reducing oxygen The concentration and the temperature of the combustion zone can reduce the amount of nitrogen oxides generated. The flue gas recirculation technology mainly reduces the thermal nitrogen oxides, which has a significant effect on the nitrogen reduction of the boiler, especially the nitrogen content of the natural gas is very low, and the nitrogen oxides are mainly generated by the thermal type, and the flue gas circulation rate is generally controlled at 10. Between ~20%, nitrogen oxide emissions from gas furnaces can be reduced by more than 40%.
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