CFD modelling of coal gasification in a fluidized bed with the effects of calcination under different operating conditions

被引：20
作者：
Diba, Mst Farhana [1 ]
Karim, Md Rezwanul [2 ]
Naser, Jamal [1 ]
机构：
[1] Swinburne Univ Technol, Fac Sci Engn & Technol, Hawthorn, Vic 3122, Australia
[2] Islamic Univ Technol, Dept Mech & Prod Engn, Gazipur 1704, Bangladesh
来源：
ENERGY | 2022年 / 239卷
关键词：
CFD; Fluidized bed; Coal gasification; Calcination; Eulerian-Eulerian modelling; Solid hydrodynamics; OXY-FUEL COMBUSTION; EULER-LAGRANGIAN MODEL; PACKED-BEDS; 3-DIMENSIONAL SIMULATION; DISPERSION COEFFICIENTS; BIOMASS COMBUSTION; WOOD GASIFICATION; KINETIC-THEORY; GRANULAR FLOW; HEAT-TRANSFER;
D O I：
10.1016/j.energy.2021.122284
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper investigates the thermochemical and physical conversion processes of coal gasification numerically with particular interest on calcination in a bubbling fluidized bed furnace. A comprehensive Eulerian-Eulerian three-dimensional model is developed for studying the gasification process. Three calcination cases are carried out under different operating conditions while one inert case is conducted to evaluate the effect of calcination. The presented numerical results aim at determining the mechanism of coal gasification in an air-steam environment with different flowrates. Evidence of particle segregation is found in the bed of coal and limestone due to density reduction and diameter shrinkage. Char conversion is investigated for different air-coal and steam-coal ratios, also the effect of bed temperature, fluid flowrate and fuel feeding rate on the carbon conversion is studied comprehensively. The highest char conversion rate is observed in the airflow rate of 17.0 kg/h where the bed temperature is found to be maximum. A noticeable impact of calcination is found in the gaseous emission while increasing CO2 concentration. Time averaged solid and gas temperature and species concentration profiles indicate the steady-state condition of numerical simulation. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：17
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