Detailed in-furnace measurements in a pulverized coal-fired furnace with combined woody biomass co-firing and air staging

• Published in: Journal of mechanical science and technology Vol. 32; no. 9; pp. 4517 - 4527
• Main Authors: Choi, Minsung, Li, Xinzhuo, Kim, Kibeom, Sung, Yonmo, Choi, Gyungmin
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.09.2018; Springer Nature B.V; 대한기계학회
• Subjects: Biomass; Biomass burning; Bituminous coal; Burnout; Coal fired furnaces; Combustion; Control; Dynamical Systems; Engineering; Fossil fuels; Gas temperature; Industrial and Production Engineering; Mechanical Engineering; Pulverized coal; Reduction; Vibration; 기계공학; Woody biomass co-firing; NO; Detailed in-furnace measurements; Pulverized coal combustion; Air-staged combustion; reduction; Burnout performance
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-018-0848-7

This paper presents a detailed experimental description of the combined effects of woody biomass co-firing and air staging on NO emissions and burnout performance in a pulverized coal-fired furnace. The co-combustion of woody biomass and bituminous coal was evaluated using woody biomass co-firing proportions of 0 % to 30 % with intervals of 10 %. Detailed in-furnace gas temperature and gas-phase concentration for species such as O 2 , CO 2 , CO and NO were measured for the co-firing flames, both with and without air staging. The overall temperature of the woody biomass co-firing flames was higher than that of the pure bituminous coal flame. This effect was more pronounced for air-staged combustion than for combustion without air staging. Co-firing woody biomass with air staging strongly affected NO reduction efficiency, whereas NO emissions were insignificant for no-staged firing. The deteriorating effect of air staging on burnout performance was a function of the woody biomass co-firing ratio. NO reduction efficiency for the air-staged flames was improved by more than 40 % in both flames for woody biomass co-firing proportions of 10 % and 20 %.