Numerical Simulation of Tail Over-Fire Air Supply of a Grate Biomass Boiler

Shidan Chi (), Yan Liang, Weixi Chen, Zhen Hou and Tao Luan ()
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Shidan Chi: Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250061, China
Yan Liang: Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250061, China
Weixi Chen: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Zhen Hou: Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250061, China
Tao Luan: School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Energies, 2022, vol. 15, issue 20, 1-11

Abstract: By taking a 130 t/h water-cooled grate biomass boiler as the research object, the ANSYS software is applied to simulate the effects of the tail burnout air’s incidence angle, wind speed, and pipe diameter on flow field distribution in the furnace, the movement of unburned carbon particles at the tail of the grate under cold operation. The influence rules of the incidence angle, pipe diameter, and wind speed of the tail burnout air on the combustion in the furnace and the movement of the tail particles were obtained. The results show that the setting of burnout air at the tail of the grate can better organize the air flow field at the grate tail, change the particle distribution, prevent small density particles from directly falling into the ash hopper, and prolong the residence time of particles on the grate. Under the study conditions, with an increase in the outlet velocity and the pipe diameter of the tail burnout air, as the movement degree and the burnout degree of grate particles increase, the boiler efficiency increases. With an increase in the incidence angle of the tail burnout air, the flow field in the furnace and the reduction ratio of the tail particles increases at first and then decreases, and the optimal incidence angle is 11–13°.

Keywords: grate boiler; grate tail burnout air; particle distribution; incidence angle; air distribution (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: 2022
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