Journal
BIORESOURCE TECHNOLOGY
Volume 194, Issue -, Pages 196-204Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.121
Keywords
Bagasse; Fluidized bed combustion; Alkalis; Agglomeration; Thermal equilibrium simulation
Funding
- National Basic Research Program of China (973 Program) [2013CB228100]
- National Natural Science Foundation of China [51406058]
- Guangdong Key Laboratory of Efficient and Clean Energy Utilization [2013A061401005]
- Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes, South China University of Technology [KLB10004]
- General Administration of Quality Supervision, Inspection of Public Projects [20140159]
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Bagasse is utilized as fuel in the biggest biomass power plant of China, however, alkalis in the fuel created severe agglomeration and slagging problems. Alkalis transfer characteristic, agglomeration causes in engineering practice, additive improvement effects and mechanism during bagasse combustion were investigated via experiments and simulations. Only slight agglomeration occurs in ash higher than 800 degrees C. Serious agglomeration in practical operation should be attributed to the gaseous alkalis evaporating at high temperature and condensing on the cooler grain surfaces in CFB. It can be speculated that ash caking can be avoided with temperature lower than 750 degrees C and heating surface corrosion caused by alkali metal vapor can be alleviated with temperature lower than 850 degrees C. Kaolin added into the bagasse has an apparent advantage over CaO additive both in enhancing ash fusion point and relieving alkali-chloride corrosion by locking alkalis in dystectic solid compounds over the whole temperature range. (C) 2015 Elsevier Ltd. All rights reserved.
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