增湿活化脱硫反应器内流动、蒸发与碰撞过程数值计算  

Numerical Calculation of the Process of Flows, Evaporation and Collision in a Desulfurization Reactor Activated through Humidification

作　　者：吴树志[1] 赵长遂[1] 段钰锋[1] 陈晓平[1] 

机构地区：[1]东南大学洁净煤发电及燃烧技术教育部重点实验室,江苏南京210096

出　　处：《热能动力工程》2003年第5期471-474,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展规划基金资助项目(G1999022201-04);高等学校博士学科点专项科研基金资助项目(1998028615)

摘　　要：介绍了喷水增湿活化脱硫反应器中的气相流动、水滴运动和蒸发、水滴与脱硫剂颗粒碰撞及碰撞后形成的浆滴过程的模型研究方法和数值计算结果。其中,气相湍流模型采用k-ε双方程模型进行数值模拟,水滴运动和蒸发模型分别采用随机轨道模型和经Ranz-Mashall修正的水滴蒸发模型,水滴与脱硫剂颗粒的碰撞则采用惯性沉聚模型进行。数值计算结果表明,活化反应器内的气相速度场已经进入紊流充分发展区,喷入反应器的雾化水滴及形成的浆滴在不长的一段距离内即蒸发完全,脱硫剂捕集主要发生在雾化水滴喷入位置后的一段距离内,此后捕集效率迅速降低。Model study methods and numerical calculation results are described of the process in an activated (through spray water humidification) desulfurization reactor concerning the following: gas phase flows, water drop motion and evaporation, collision of water drops with particles of desulfurizing agents, as well as serous drops formed after the collision. The numerical simulation of a gas-phase turbulent flow model was conducted by the use of a k-Ε dual-equation model. Water-drop motion and evaporation model was respectively simulated with the use of a random trajectory model and a water-drop evaporation model after a Ranz-Mashall modification. The collision between water drops and particles of desulfurizing agent was simulated by way of an inertia sedimentation model. The results of the numerical calculation indicate that the gas-phase velocity field in the activated reactor has evolved to a fully developed zone of turbulent flows. The atomized water drops injected into the reactor and the serous drops formed have completely evaporated within a short distance. The capture of desulfurizing agents mainly occurred in a section not far behind the location where water drops have been injected, followed by a drastic reduction of the capture efficiency.

关 键 词：脱硫 数值模拟 蒸发 碰撞 增湿 活化 脱硫反应器 

分 类 号：X511[环境科学与工程—环境工程]