Experimental determination of bed agglomeration tendencies of some common agricultural residues in fluidized bed combustion and gasification

被引:89
作者
Natarajan, E [1 ]
Ohman, M
Gabra, M
Nordin, A
Liliedahl, T
Rao, AN
机构
[1] Anna Univ, Dept Engn Mech, Ctr New & Renewable Sources Energy, Madras 600025, Tamil Nadu, India
[2] Umea Univ, Dept Inorgan Chem, Energy Technol Ctr, S-94128 Umea, Sweden
[3] Lulea Univ Technol, Div Energy Engn, S-97187 Lulea, Sweden
[4] Royal Inst Technol, Dept Chem Engn & Technol, S-10044 Stockholm, Sweden
关键词
fluidized bed; agglomeration; ash fusion; combustion; gasification; biomass; rice husk; bagasse; cane trash; olive flesh;
D O I
10.1016/S0961-9534(98)00015-4
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Ever increasing energy demand and the polluting nature of existing fossil fuel energy sources demonstrate the need for other non-polluting and renewable sources of energy. The agricultural residues available in abundance in many countries can be used for power generation. The fluidized bed technology seems to be suitable for converting a wide range of agricultural residues into energy, due to its inherent advantages of fuel flexibility, low operating temperature and isothermal operating condition. The major ash-related problem encountered in fluidized beds is bed agglomeration which, in the worst case, may result in total defluidization and unscheduled downtime. The initial agglomeration temperature for some common tropical agricultural residues were experimentally determined by using a newly developed method based on the controlled fluidized bed agglomeration test. The agricultural residues chosen for the study were rice husk, bagasse, cane trash and olive flesh. The results showed that the initial agglomeration temperatures were less than the initial deformation temperature predicted by the ASTM standard ash fusion tests for all fuels considered. The initial agglomeration temperatures of rice husk and bagasse were more than 1000 degrees C. The agglomeration of cane trash and olive flesh was encountered at relatively low temperatures and their initial agglomeration temperatures in gasification were lower than those in combustion with both bed materials. The use of lime as bed material instead of quartz improved the agglomeration temperature of cane trash and olive flesh in combustion and decreased the same in gasification. The results indicate that rice husk and bagasse can be used in the fluidized bed for energy generation since their agglomeration temperatures are sufficiently high. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:163 / 169
页数:7
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