title: Experiment and simulation study on alkalis transfer characteristic during direct combustion utilization of bagasse.
abstract: 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°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°C and heating surface corrosion caused by alkali metal vapor can be alleviated with temperature lower than 850°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.
authors.affiliation: Guangdong Key Laboratory of Efficient and Clean Energy Utilization Institutes, School of Electric Power, South China University of Technology, Guangzhou 510640, People's Republic of China. Electronic address: yfliao@scut.edu.cn.
authors.forename: Yanfen
authors.initials: Y
authors.lastname: Liao
authors.affiliation: Guangdong Key Laboratory of Efficient and Clean Energy Utilization Institutes, School of Electric Power, South China University of Technology, Guangzhou 510640, People's Republic of China.
authors.forename: Yawen
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Guangdong Key Laboratory of Efficient and Clean Energy Utilization Institutes, School of Electric Power, South China University of Technology, Guangzhou 510640, People's Republic of China.
authors.forename: Tuo
authors.initials: T
authors.lastname: Chen
authors.affiliation: Guangdong Key Laboratory of Efficient and Clean Energy Utilization Institutes, School of Electric Power, South China University of Technology, Guangzhou 510640, People's Republic of China.
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Ma
mesh_terms: D000468:Alkalies / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors; D017610:Calcium Compounds / Q000494:pharmacology; D002482:Cellulose / Q000378:metabolism*; D002713:Chlorine / Q000032:analysis; D003198:Computer Simulation; D006851:Hydrochloric Acid / Q000494:pharmacology; D007616:Kaolin / Q000494:pharmacology; D010087:Oxides / Q000494:pharmacology; D011188:Potassium / Q000032:analysis; D013057:Spectrum Analysis; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000468:Alkalies; D017610:Calcium Compounds; D010087:Oxides; D007616:Kaolin; D002713:Chlorine; D002482:Cellulose; C027433:bagasse; C016538:lime; D006851:Hydrochloric Acid; D011188:Potassium
keywords: Agglomeration; Alkalis; Bagasse; Fluidized bed combustion; Thermal equilibrium simulation