Ca(OH)_2–H_2O–CO_2系统气液反应结晶数值模拟  

Gas-liquid Reactive Crystallization of Ca(OH)_2-H_2O-CO_2 System:Modelling

作　　者：赵文立[1] 沙作良[1] 

机构地区：[1]天津科技大学化工与材料学院,天津300457

出　　处：《天津科技大学学报》2017年第3期39-44,共6页Journal of Tianjin University of Science & Technology

摘　　要：在实验的基础上建立理想混合假设下Ca(OH)_2–H_2O–CO_2系统气液反应结晶模型.此模型包含气液物理吸收与化学吸收模型、结晶动力学模型以及气泡与晶体的粒数群体平衡模型.为解决模型刚性问题,采用高阶矩量分类法对粒数群体平衡模型进行矩变换并离散,采用高阶向后差分算法对方程组进行求解.通过实验数据对结晶动力学模型中的未知参数进行回归,得到与实验结果高度相符的反应结晶模型,为深入了解气液反应结晶机理提供理论依据.A mathematical model was proposed for the gas-liquid reactive crystallization of Ca （OH）2-H20-C02 system under the assumption of well-mixing condition. The model includes a physical and chemical gas-liquid absorption model, a crystallization kinetics model and a population balance model. To overcome the stiff problem of the model, the high order model method of classes and high order back differential algorithm were introduced to solve the equation set. The unknown parameters were regressed based on the previous experimental data. The results of the model showed excellent agreement with the experimental data and thus provided a better understanding of the gas-liquid reactive crystallization.

关 键 词：气液反应结晶 数值模拟 粒数群体平衡 高阶矩量法 

分 类 号：TQ021.4[化学工程]