Experimental and Numerical Simulation Research on Different Shapes of Flame-Stabilizing Baffles in the Furnace

Hongwei Shi (), Xiao Yin, Chunming Wang and Haipeng Wang
Additional contact information
Hongwei Shi: School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330044, China
Xiao Yin: National Energy Group Nanning Power Generation Co., Ltd., Nanning 530028, China
Chunming Wang: School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330044, China
Haipeng Wang: School of Energy and Mechanical Engineering, Jiangxi University of Science and Technology, Nanchang 330044, China

Energies, 2024, vol. 17, issue 17, 1-21

Abstract: The use of fully premixed combustion in small gas boilers can improve denitrification efficiency. On the basis of fully premixed combustion, adding flame stabilizers inside the boiler can further reduce production of oxides of nitrogen. Four types of flame-stabilizing baffles were added at a certain position inside the furnace after the fully premixed burner. Experiments were conducted separately on the Noporous baffle, and numerical calculations were performed for 36 operating conditions of the four baffles. The experimental results and numerical calculations indicate that under experimental conditions, NO x emissions were all below 40 mg/m 3 , and the net heat efficiency of the boiler was above 80%. Under a maximum firing rate, CO emissions are below 20 ppm, and the minimum error between the calculated and experimental values is 2.2%. The calculation error of CO emissions under various working conditions does not exceed 6.8%, indicating that the impact of different-shaped baffles on CO emissions is relatively small. When installing a Nonporous baffle, the error between the experimental and calculated exhaust temperature values under minimum firing rates is 6.6%, the error between the calculated and measured values under middle firing conditions is 2.9%, and the error between the calculated and measured values under maximum firing rate conditions is 3.0%. Among the four different partition conditions, the exhaust temperature of the Nonporous baffle is the lowest. Under the same excess air coefficient, the pressure in the furnace for the middle and maximum firing rate is higher than that of the minimum firing rate, and the experimental values are in good agreement with the calculated values. When installing the Strip baffle, the calculated CO 2 emission is the lowest. The experimental results show that the NO x in the flue gas inside the furnace is mainly NO, and the NO content exceeds 75%, reaching a maximum of 85%. The experimental results show that the minimum NO x emission value is 26.9 mg/m 3 . The error between the measured and calculated NO x values when installing a Nonporous baffle is 20.4%. All of the above indicate that installing a flame-stabilizing baffle at an appropriate position in the furnace can further reduce NO x emissions, and the optimization amplitude is related to the shape of the baffle.

Keywords: natural gas; combustion; denitration; numerical simulation (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: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/17/4253/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/17/4253/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:17:p:4253-:d:1463992

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().