Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw

Jun Zhang, Yanmin Li, Lin Mei, Xiaoliang Yu, Xun Lv, Jinping Wang, Jin Yan () and Rongyue Sun ()
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Jun Zhang: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Yanmin Li: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Lin Mei: Key Laboratory of Electromechanical Equipment Security in Western Complex Environment for State Market Regulation, Chongqing 401121, China
Xiaoliang Yu: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Xun Lv: Xizi Clean Energy Equipment Manufacturing Co., Ltd., Hangzhou 310021, China
Jinping Wang: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Jin Yan: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Rongyue Sun: College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China

Energies, 2023, vol. 16, issue 8, 1-15

Abstract: Biomass fuels play an important role in the field of fluidized bed combustion, but due to the diversity and uncertainty of fuels, there are usually some problems of high CO emission that cannot be directly solved by combustion adjustment. In this paper, a 75 t/h biomass fluidized bed was taken as the research object. It was observed from the field test that the gas incomplete combustion loss reached 12.13% when mono-combustion of wheat straw was conducted, and the CO concentration in the exhaust gas exceeded 30k ppm. Combined with the CPFD numerical simulation, the combustion characteristics and influence of secondary air layout on CO reduction performance were discussed in detail. The results revealed that the gas temperature gradually increased along furnace height under the initial condition, and the maximum temperature was more than 1000 °C at furnace outlet. The air curtain of the secondary air jets was insufficient, and the wheat straw rose rapidly as it entered into the furnace. By arranging adjacent secondary air ports above each fuel-feeding inlet, the residence time of particles in the furnace could be significantly increased, thus, the furnace temperature distribution was more reasonable and the CO emission was reduced by 58.6%.

Keywords: fluidized bed; secondary air; wheat straw; CO emission (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: 2023
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