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作 者:刘丽艳[1] 李晨辰[1] 朱国瑞[1] 张战军 孙俊民 谭蔚[1]
机构地区:[1]天津大学化工学院,天津300072 [2]大唐国际再生资源开发有限公司,呼和浩特010206
出 处:《天津大学学报(自然科学与工程技术版)》2015年第5期388-394,共7页Journal of Tianjin University:Science and Technology
基 金:国家自然科学基金资助项目(21376167);国家'十一五'科技支撑计划资助项目(2009BAB49B00)
摘 要:用数值模拟方法对粉煤灰预处理浆液槽内固相颗粒的沉降及悬浮瞬态过程进行研究,同时以稳态模拟结果为初值对工业实际生产中的突发停车事故进行了研究,并分析了颗粒相分布和搅拌功率在停车以及再启动过程中的变化情况.结果表明,在浆液槽停车过程中内部固液两相运动速度不断衰减,固相颗粒逐渐在槽底形成沉积层,槽上部出现清液层;再启动之后固相颗粒重新分布于浆液槽中,停车0.5,h和1.0,h分别需经过6,min和10,min的搅拌才可以再次达到均匀悬浮状态,而且再启动初期搅拌功率陡增,最高可以达到稳定水平的1.6倍,如果不在搅拌设备上预先加装辅助搅拌设备则会有烧毁电机的危险.本研究可以有效预防突发停车事故.Numerical simulation method was adopted to study the suspension process of solid particles in the fly ash- sodium hydroxide slurry talak. With the steady state simulation results as the initial value of stop of industrial produc- tion, the transient solver was applied to analyzing the changes of particle distribution and stirring power during the stop and restart process. The results indicate that, during the stop process, the velocity of the particles and liquid decreases continuously, and solid particles gradually accumulate at the bottom of the tank to form deposition layer, while the upper area of supernatant layer is substantially free of particles. After restarting, the solid particles redis- tribute in the slurry tank. 6 and 10 minutes of stirring are needed to achieve uniform suspension after stopping for 0.5 h and 1.0 h respectively. There is a steep increase in stirring power at the initial stage of restart process, with the maxi- mum up to 1.6 times that at the stable level. There also exists a risk of burning motor if no auxiliary mixing equipment is preinstalled. This study can offer an effective preventive measure against the damage of sudden stop accidents.
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