Study on simultaneous decomposition and sulfation behavior of carbide slag in CFBB desulfurization
The property of carbide slag and the combustion conditions in the circulating fluidized bed boiler(CFBB)have a big influence on the in-furnace desulfurization efficiency and calcium utilization of carbide slag.The effects of carbide slag particle size,reaction temperature and CO2 concentration on the simultaneous decomposition and sulfation of carbide slag were systematically studied and their influence mechanism was analyzed.The results showed that the carbide slag would first undergo a carbonation reaction to produce CaCO3 and then calcined to CaO,which continued to be sulfated.Particle size variation had no significant impact on the desulfurization performance of carbide slag.The desulfurization performance of carbide slag was greatly enhanced under high temperature(850℃,950℃),with calcium utilization up to 80.83%,while the carbonation reaction of carbide slag competed with the sulfation reaction under low temperature conditions(650℃,750℃)and was not conducive to the sulfation reaction.When the CO2 volume fraction was at 55%and 70%,the decomposition of generated CaCO3 was blocked and thus affected the sulfation reaction.However,when the CO2 volume fraction was lower than 35%,although the reaction of carbide slag in the early stage was affected by the concentration of CO2,there was no big difference in desulfurization performance for final CO2 volume fraction of 35%compared with that of 15%.
carbide slagdesulfurizationsimultaneous decomposition and sulfationtemperatureCO2 concentrationparticle size
丛日学、赵文鑫、刘文倩、赵江婷、杨凤玲、张圆圆
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国家电投集团吉林能源投资有限公司通化分公司,吉林 通化 154003
山西大学 CO2 减排与资源化利用教育部工程研究中心,国家环境保护煤炭废弃物资源化高效利用技术重点实验室,山西 太原 030006
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