Effects of Hydrogen Addition on the Thermal Performance and Emissions of Biomass Syngas Combustion in a Horizontal Boiler

Shengnan Suxing, Xiao Yu, Jinze Li, Xuelai Liu, Lichao Sui, Jingkui Zhang, Zaiguo Fu () and Yan Shao
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Shengnan Suxing: Gansu Diantong Electric Power Engineering Design Consulting Co., Ltd., Lanzhou 730050, China
Xiao Yu: Gansu Diantong Electric Power Engineering Design Consulting Co., Ltd., Lanzhou 730050, China
Jinze Li: Gansu Diantong Electric Power Engineering Design Consulting Co., Ltd., Lanzhou 730050, China
Xuelai Liu: Gansu Diantong Electric Power Engineering Design Consulting Co., Ltd., Lanzhou 730050, China
Lichao Sui: College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, China
Jingkui Zhang: College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, China
Zaiguo Fu: College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, China
Yan Shao: College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, China

Energies, 2024, vol. 17, issue 11, 1-22

Abstract: Due to its low calorific value, abnormal phenomena such as incomplete combustion and flameout may occur during the combustion process of biomass syngas. The applicability of adding hydrogen can assist in the combustion of biomass syngas in boilers to overcome the above defects, and the effects need to be investigated. In this study, a multi-mechanism model is employed to numerically simulate the flow and combustion of a horizontal boiler burning biomass syngas. The reliability verification of the model is conducted by comparing it with the experimental results of combustion in a domestic boiler with biomass syngas. From the views of multi-fields and synergy, the effects of hydrogen addition on the thermal performance and emissions of biomass syngas are further expounded. Two scenarios are taken into consideration: hydrogen addition at a constant fuel volume flow rate and constant heat input. The result indicates that hydrogen addition significantly affects the multi-field synergy, which is advantageous for improving the heat transfer performance and combustion efficiency of biomass syngas. However, when the hydrogen addition ratio exceeds 20% at a constant fuel volume flow rate and 25% at constant heat input, its impact may be reduced. When the hydrogen content increases, the outlet temperature of the combustion chamber decreases, and pollutant emissions are effectively controlled. The turbulent kinetic energy at the reversal section decreases, and the uniformity of the flow field improves. These results provide certain guidance for the efficient utilization of biomass syngas and the operation of boilers burning biomass syngas.

Keywords: hydrogen addition; biomass syngas; combustion characteristic; field synergy (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
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