填料型预碳化塔的数学模型与模拟  

Modelling and Simulation of Packed Pre carbonation Column

作　　者：李希[1] 

机构地区：[1]浙江大学化学工程系

出　　处：《高校化学工程学报》1998年第4期355-360,共6页Journal of Chemical Engineering of Chinese Universities

摘　　要：碳酸化反应为一典型的连串、可逆放热反应，液膜内的快反应与液相本体的慢反应相互耦合，共同决定着ＣＯ２的化学吸收速率。本文在以往工作的基础上，通过对碳化机理和动力学的全面分析，建立了填料型预碳化塔的数学模型。对有关工业过程进行了模拟，指出了影响填料行为的关键因素并提出了相应的改进措施。The pre carbonation process is referred to absorption of CO 2 and NH 3 in packed column by ammoniac brine. The process includes three consecutive and reversible reactions: the fast one between CO 2 and NH 3 takes place in the liquid film close to gas liquid interface, and the slow two, carbomate hydrolysis and NaHCO 3 precipitation, take place in the bulk liquid layer adhere to surface of packings. A mathematical model describing chemical absorption of CO 2 and NH 3 in the packed column was developed in this paper. The model is composed of three parts: the film model, bulk model and the column model. Computed temperature and NH 3 concentration profiles exhibit a maximum near the bottom of column, respectively, which is attributed to absorption desorption circle of ammonia in the column. Sensitive operating parameters were tested by simulation of the process, and the related improvement for the industrial process was proposed.

关 键 词：填料塔 数学模型 碳化塔 碳酸氢钠 碳酸化反应 

分 类 号：TQ131.12[化学工程—无机化工]