Experimental and numerical modeling of co-combustion of biomass gasification gas and natural gas in a non-premixed burner

Haodong Fan, Han Zhang, Xiong Zhang, Zixue Luo, Yaojie Tu and Shihong Zhang

Energy, 2024, vol. 313, issue C

Abstract: Biomass gasification gas has the characteristics of low calorific value and great potential for carbon emission reduction. It is currently being widely used in traditional industries to replace fossil energy. Current burners fail to fulfill the demands for co-combustion of biomass gasification gas and natural gas due to singular structure. Moreover, understanding the blending methods, blending ratio, stability of combustion, and the emission rules of pollutants are not yet clear. This study proposes a non-premixed burner for the co-combustion of biomass gasification gas and natural gas (BG- NG). The effects of differing burner loads (P), excess air coefficients (α), and biomass gasification gas blending ratio (XBG) on the flame structure, pollutant (CO and NO) emission performance, and flame lift distance (HL) of this burner during the co-combustion of natural gas and biomass gasification gas, have been investigated via experimental and simulation methods. The results show that the optimalα and XBG are 1.4 and 40%, respectively, after co-combustion natural gas with biomass gasification gas. When α and XBG are 1.4 and 70%, the CO emission concentration is approximately 18.71 times that α and XBG are 1.4 and 40%. The minimum NO emission concentration is a mere 2.5 ppm. Under the same experimental conditions, the NO emission concentration decreased by 60% and the CO emission concentration decreased by 75% when co-combustion with 40% biomass gasification gas, compared to the combustion of natural gas. The analysis of flame lift distance indicates that the use of the non-premixed burner can reduce the flame lift distance from 22.5 mm to 4.1 mm. The simulation results found that co-combustion with biomass gasification gas can increase the flame propagation speed and enhance flame stability. The research in this manuscript contributes to meeting the safe operation requirements of industrial kilns with a high proportion of biomass gasification gas co-combustion. This is crucial for the development of industrial kilns, economic benefits, and low-nitrogen environmental protection.

Keywords: Biomass gasification gas; Co-combustion; Non-premixed; Flame lift distance (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s036054422403576x

DOI: 10.1016/j.energy.2024.133798

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