环境工程学报2018，Vol.12Issue(4)：1148-1155,8.DOI:10.12030/j.cjee.201711097
多孔CaO颗粒脱硫过程中硫酸盐化特性的数值模拟
Numerical simulation of sulfation characteristics of porous CaO particles during desulfurization
摘要
Abstract
In the process of controlling SO2 by injecting calcium into the circulating fluidized bed furnace,the newly formed CaSO4 will block the pores of CaO particles,resulting in the reduction of desulfurization efficiency.Most researchers believe that there are two ways for CaSO4 to block the pores of CaO particles.One is that the CaSO4 product layer is covered on the outer surface of particles,causing blockage of the outlet of the pores.The second is that SO2 enters the pores and generates CaSO4 to form a uniform blockage.This method ignores the difference of SO2 concentration in the pore,which is far from the actual situation.To solve this problem,a discrete shrinkage pore stochastic pore model was established to numerically simulate the reaction process of CaO particles with SO2.The effect of the generated CaSO4 has been considered by the new model,and the influence of inner pore SO2 concentration difference on the transformation rate of CaO particles,and the reaction process of pore structure influence on the overall transformation of the particle shrinkage.Through independent programming and computing by fortran,the results show that the new model is in good agreement with the experimental data.In the process of CaO particle reaction,because of the high concentration of SO2 outside the particles,the reaction takes place first and blocks the pores of particles,resulting in a large amount of CaO in the particles which is not involved in the reaction.The optimum environmental temperature of CaO sulfation is from 800 to 900 ℃,too high and too low will have a negative impact on sulfation.The smaller the particle size is,the higher the sulfur retention efficiency of CaO is.关键词
CaO颗粒/硫酸盐化/随机孔模型/数值模拟/热质传输/烟气脱硫Key words
CaO particles/sulfation/random pore model/numerical simulation/heat and mass transfer/flue gas desulfurization分类
资源环境引用本文复制引用
曲践,王照国,武文斐..多孔CaO颗粒脱硫过程中硫酸盐化特性的数值模拟[J].环境工程学报,2018,12(4):1148-1155,8.基金项目
内蒙古自然科学基金资助项目(2017MS (LH) 0529) （2017MS (LH）
内蒙古高校创新团队资助项目(NMGIRT1406) （NMGIRT1406）
绿能企管科研创新基金资助项目 （）
