Open AccessHydrodynamic and gasification studies of sawdust in a pressurized circulating fluidized bed
Author(s) -
Abinash Mahapatro,
Pinakeswar Mahanta
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/605/1/012003
Subject(s) - syngas , wood gas generator , bar (unit) , fluidized bed , sawdust , fluidized bed combustion , suspension (topology) , chemistry , yield (engineering) , gas composition , waste management , materials science , thermodynamics , composite material , coal , catalysis , organic chemistry , engineering , geology , oceanography , mathematics , physics , homotopy , pure mathematics
The present research is focused on the hydrodynamics and gasification studies of a pressurized circulating fluidized bed (PCFB) gasifier considering saw dust as a bed inventory. The operating pressure range of the PCFB gasifier is maintained in between 1 to 4 bar and the suspension density, syngas composition, lower heating value (LHV), gas yield, carbon conversion efficiency (CCE) and cold gas efficiency (CGE) were calculated and presented in this paper. The suspension density increases with rise in operating pressure and decreases with rise in superficial velocity. The concentration of CH4 in the syngas was found to be increasing with rise in bed pressure and is found to be 4.78 % at 4 bar. However, no significant effect of operating pressure on H2 concentration is observed and is found to vary between 8.3 to 7.95 %. The CO concentration increases up to 2 bar pressure and decreases gradually afterwards. The LHV, gas yield, CCE and CGE has a positive response to the rise in operating pressure and found maximum at 4 bar. The CCE and CGE of the PCFB gasifier are increased by 57 % and 58 %, respectively when the operating pressure is changed from 1 to 4 bar.