Research on Full Premixed Combustion and Emission Characteristics of Non-Electric Gas Boiler

Hong-Wei Shi () and Hai-Peng Wang
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Hong-Wei Shi: School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330044, China
Hai-Peng Wang: School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330044, China

Energies, 2023, vol. 16, issue 21, 1-28

Abstract: NO x has become one of the main culprits causing the global greenhouse effect, and excessive emissions of NO x can also cause some common diseases in humans. The denitrification of power plant boilers has been 100% popularized, and their denitrification efficiency has reached national and local environmental requirements (such as Selective Catalytic Reduction, SCR). However, small gas boilers, due to their use of relatively clean fuels, have relatively low NO x emissions. But, local environmental protection departments have weak supervision of small clean fuel boilers, and these equipment generally lack specialized denitrification equipment, resulting in NO x emissions still not meeting standards. In addition, there are many small gas boilers, resulting in high total emissions. The fully premixed burner of a small gas boiler has the effect of suppressing NO x production during combustion. This study designed a surface porous burner with different combustion intensities at different positions. The experimental results and numerical calculations show that for horizontal combustion, the burner has different intake rates at different axial positions, enabling uniform combustion throughout the entire furnace, with NO x emissions below 30 mg/Nm 3 . The numerical simulation results show that the NO x emissions are 26.6 mg/m 3 . The calculated results are in good agreement with the actual situation. The generation of NO x is mainly thermal, with a maximum error of 15.4% between the calculated and experimental values. The difference between the calculated value of O and the experimental one is 5.1%. It can be seen that numerical simulation has considerable accuracy.

Keywords: natural gas; fully premixed; simulation; NO x (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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