Estimation of solids circulation rate and char transfer rate from gasifier to combustor in a dual fluidized-bed pilot plant for biomass steam gasification

被引:8
作者
Rahman, M. Hafizur [1 ]
Daniel, Lius [1 ]
Shah, Ujash [1 ]
Bi, Xiaotao [1 ]
Grace, John R. [1 ]
Lim, C. Jim [1 ]
机构
[1] Univ British Columbia, Fluidizat Res Ctr, Dept Chem & Biol Engn, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada
来源
PARTICUOLOGY | 2019年 / 46卷
基金
加拿大自然科学与工程研究理事会;
关键词
Solids circulation rate; Char transfer rate; Pilot-plant gasifier; Dual fluidized bed; Mass and energy balance;
D O I
10.1016/j.partic.2019.03.004
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Operation of a dual fluidized bed, consisting of a riser as combustor and bubbling bed as gasifier, for synthesis gas production from a solid fuel requires determination of the solids circulation rate and char transfer rate. The performance relies on supplying sufficient heat from the combustor to the gasifier by circulation of solids between these two reactors. The flow rate of char is required to track the heat generated in the combustor, which supports endothermic reactions in the gasifier. Direct measurement of these two critical parameters is difficult, with the number of reported techniques capable of working at high temperatures extremely small. An indirect method was developed, using mass and energy balances over the entire system and individual reactors, to estimate the solids circulation rate and char transfer rate. There was general agreement between heat losses estimated from energy-balance calculations and from direct measurement of the outer reactor surface temperature. Under typical gasification conditions, the solids circulation fluxes were estimated to be 45.2 and 55.6 kg/(m(2) s) in two independent tests, which were in good agreement with values obtained using a thermal tracer; char transfer rates were calculated to be 1.2 and 0.6 kg/h, which were in reasonable agreement with average biomass feed rates. This method can be applied to dual gasification systems at any temperature or flow rate. (C) 2019 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:22 / 29
页数:8
相关论文
共 20 条
[1]   Design methods for fluidised bed gasifiers: comparison of three approaches [J].
Basu, P. ;
Acharya, B. ;
Kaushal, P. .
JOURNAL OF THE ENERGY INSTITUTE, 2010, 83 (01) :32-40
[2]   High density and high solids flux CFB risers for steam gasification of solids fuels [J].
Bi, Xiaotao T. ;
Liu, Xinhua .
FUEL PROCESSING TECHNOLOGY, 2010, 91 (08) :915-920
[3]  
Black J. W, 1980, ACS SYM SER, V130, P351
[4]  
Burkell J.J., 1988, CIRCULATING FLUIDIZE, P501, DOI [10.1016/B978-0-08-036225-0.50054-X, DOI 10.1016/B978-0-08-036225-0.50054-X]
[5]   Biomass gasification with pure steam in fluidised bed: 12 variables that affect the effectiveness of the biomass gasifier [J].
Corella, Jose ;
Toledo, Jose-Manuel ;
Molina, Gregorio .
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY, 2008, 1 (1-2) :194-207
[6]   Applications of active acoustics in particle technology [J].
Davies, Clive E. ;
Tallon, Stephen J. ;
Webster, Emile S. .
PARTICUOLOGY, 2010, 8 (06) :568-571
[7]  
Ellis N, 2012, 21 INT C FLUID BED C, P681
[8]  
Felder R.M., 2000, ELEMENTARY PRINCIPLE, V3rd
[9]   Enhanced hydrogen production from biomass with in situ carbon dioxide capture using calcium oxide sorbents [J].
Florin, Nicholas H. ;
Harris, Andrew T. .
CHEMICAL ENGINEERING SCIENCE, 2008, 63 (02) :287-316
[10]  
Geankoplis C. J., 2003, TRANSPORT PROCESSES