Experimental study on NOx generation and emission characteristics of layer combustion of peanut shell briquette fuel

Dongwei Shao; Haitao Zhong; Xiaohai Wei; Jiduo Zhang; Hao Sun; Ping Han; Xiuyin Liu; Liping Cai; Changlei Xia; Jiyi Luan

doi:10.1016/j.biortech.2025.133507

Experimental study on NOx generation and emission characteristics of layer combustion of peanut shell briquette fuel

Bioresour Technol. 2026 Jan:440:133507. doi: 10.1016/j.biortech.2025.133507. Epub 2025 Oct 13.

Authors

Dongwei Shao¹, Haitao Zhong², Xiaohai Wei¹, Jiduo Zhang¹, Hao Sun¹, Ping Han¹, Xiuyin Liu³, Liping Cai⁴, Changlei Xia⁴, Jiyi Luan⁵

Affiliations

¹ School of Mechanical Engineering, Jiamusi University, No. 258, Xuefu Street, Jiamusi, Heilongjiang, PR China.
² School of Mechanical Engineering, Jiamusi University, No. 258, Xuefu Street, Jiamusi, Heilongjiang, PR China; Bureau of Agriculture and Rural Affairs of Ningjin County, 27 Central Street, Ningcheng Street, Ningjin County, Dezhou, Shandong, PR China.
³ Bureau of Agriculture and Rural Affairs of Ningjin County, 27 Central Street, Ningcheng Street, Ningjin County, Dezhou, Shandong, PR China.
⁴ College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, PR China.
⁵ School of Mechanical Engineering, Jiamusi University, No. 258, Xuefu Street, Jiamusi, Heilongjiang, PR China. Electronic address: jmsdxljy@jmsu.edu.cn.

PMID: 41093032
DOI: 10.1016/j.biortech.2025.133507

Abstract

This study aimed to reduce NO_x generation and emissions during the combustion of biomass in boilers. The variations in gas-phase composition and NO generation of peanut shell briquette fuel were investigated using a unit layer combustion test platform under five working conditions with air supply rates ranging from 30 to 70 Nm³/h. The experimental results showed that the average concentration of NO in the ignition zone was significantly higher than that in the combustion zone, while the oxidation zone covering the reduction layer exhibited the lowest average NO concentration. An innovative segmented combustion characteristics model for peanut shell pelletized fuel was developed using the temperature-dependent gas phase composition method. Based on the analysis of the NO reduction effect in the coke reduction layer, the optimal scheme was identified at an air supply rate of 60 Nm³/h (α = 1.08), where the average NO emission concentration, adjusted to 9 % O₂, was 281.75 mg/m³. These findings provide a theoretical basis for achieving low-nitrogen combustion in peanut shell briquette fuel.

Keywords: Bed layer; Combustion segments; NO(x); Peanut shell molding fuel; Wind supply.

MeSH terms

Air Pollutants* / analysis
Arachis* / chemistry
Biomass
Nitrogen Oxides* / analysis
Temperature

Substances

Nitrogen Oxides
Air Pollutants