摘要
为了有效控制燃煤烟气中的汞排放和有效解决燃煤飞灰的资源化利用问题,制备出一种新型的氯化铜改性磁珠脱汞吸附剂(Cu-MF)。在固定床吸附系统中,系统研究了反应温度(100℃~180℃)、烟气流量(0.8 L/min~1.5 L/min)、吸附剂用量(0.2 g~1.0 g)、SO_(2)体积分数(800×10^(-6)~1200×10^(-6))和NO体积分数(100×10^(-6)~300×10^(-6))对改性磁珠吸附剂汞吸附性能的影响。分别采用准一级和准二级动力学模型分析了改性磁珠吸附剂的汞吸附机制和控制过程,通过程序升温脱附(temperature programmed desorption,TPD)的方法探讨了改性磁珠吸附剂的汞脱附再生过程。结果表明:改性磁珠吸附剂在120℃~150℃区间内具有较高的汞脱除能力,吸附剂用量的增加有利于汞的脱除,而烟气流量和烟气组分(SO_(2),NO)对改性磁珠吸附剂汞吸附性能的影响较小。在不同反应温度和不同烟气流量下,改性磁珠吸附剂的脱汞过程可以通过准一级和准二级动力学模型描述。当吸附剂用量大于0.5 g时,改性磁珠吸附剂的吸附行为受物理吸附及化学吸附行为双重因素控制,可以分别用准一级和准二级动力学模型来描述改性磁珠吸附剂在SO_(2)和NO存在时的汞吸附过程。改性磁珠吸附剂的汞脱附行为更符合准一级动力学模型。
In order to effectively control mercury emissions in coal-fired flue gas and solve the problem of resource utilization of coal-fired fly ash,a novel copper chloride-modified magnetospheres adsorbent(Cu-MF)for mercury removal was prepared.By applying a fixed-bed adsorption system,the effects of reaction temperature(100℃-180℃),flow of flue gas(0.8 L/min-1.5 L/min),adsorbent dosage(0.2 g-1.0 g),SO_(2) volume fraction(800×10^(-6)-1200×10^(-6))and NO volume fraction(100×10^(-6)-300×10^(-6))on the mercury removal performance of the Cu-MF were systematically studied.The mercury adsorption mechanism and control process of the Cu-MF were analyzed using pseudo-first-order kinetic model and pseudo-second-order kinetic model,respectively.The mercury desorption regeneration process of the Cu-MF was explored through temperature-programmed desorption(TPD)method.The results show that the Cu-MF has high mercury removal ability in the temperature range of 120℃to 150℃.An increase in the amount of adsorbent is beneficial for mercury removal,while the flue gas flow and flue gas components(SO_(2),NO)have little effect on the mercury removal performance of the Cu-MF.The mercury removal process of the Cu-MF can be described by the pseudo-first-order kinetic model and pseudo-second-order kinetic model at different reaction temperatures and flue gas flow.When the adsorbent dosage exceeds 0.5 g,the adsorption behavior of the Cu-MF is controlled by both physical and chemical adsorption behaviors.The adsorption process of the Cu-MF in the presence of SO_(2) and NO can be described using the pseudo-first-order kinetic model and pseudo-second-order kinetic model,respectively.The mercury desorption behavior of the Cu-MF is more in line with the pseudo-first-order kinetic model.
作者
谢占军
魏书洲
杨威
赵永椿
常林
张军营
XIE Zhanjun;WEI Shuzhou;YANG Wei;ZHAO Yongchun;CHANG Lin;ZHANG Junying(Sanhe Power Generation Company Limited,065201 Sanhe,China;Hebei Innovation Center for Coal-fired Power Station Pollution Control,065201 Sanhe,China;National Key Laboratory of Coal Combustion and Low Carbon Utilization,Huazhong University of Science and Technology,430074 Wuhan,China;New Energy Technology Research Institute Company Limited,CHN Energy,102209 Beijing,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2024年第1期91-99,共9页
Coal Conversion
基金
国家自然科学基金项目(42030807)。
关键词
烟气
单质汞
磁珠
吸附动力学
脱附再生
flue gas
elemental mercury
magnetosphere
adsorption kinetics
desorption regeneration
