磷铵尾气冷凝减排工艺及机理模型  

Simulation and mechanism modeling of condensation and dehumidification of ammonium phosphate tail gases

作　　者：马空军[1] 贾殿赠[1] 朱家骅[2] 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046 [2]四川大学化工学院,四川成都610065

出　　处：《化学工程》2011年第4期1-6,共6页Chemical Engineering(China)

基　　金：国家高技术研究发展计划资助项目(2002AA647020)

摘　　要：分析了某厂60万t/a磷酸二铵(DAP)生产装置尾气形成"磷铵雨"的热力学机理,提出了DAP尾气资源化循环联产磷酸一铵(MAP)的清洁生产工艺,现场实验证明了此工艺的安全性与可行性。对高湿度DAP尾气冷凝脱湿进行模型研究和数值模拟,引入权重系数α表征雾状冷凝和膜状冷凝并存的权重,现场实验传热传质数据表明:DAP尾气水汽冷凝减排量为34%—57%,与雾状冷凝和膜状冷凝并存的权重α=0.2时的数值模拟结果吻合,验证了雾状冷凝和膜状冷凝共存的机理,合理地描述了高湿度工业废气冷凝脱湿气传热传质机理。Focusing on the thermodynamic mechanism of P-NH3 polluted droplets formed in the exhausting gases discharged from a 600 000 t/a diammonium phosphate（DAP） production line,a unique technique was developed to make a full use of the clean process for monoammonium phosphate（MAP）production combining with recycling of exhaust gases from DAP production.The spot experiment validates that this technique is safe and feasible.The processes of condensation and dehumidification of high humidity DAP exhaust gases were modeled and simulated.A weight factor α was introduced in the model to quantitatively express the effect of condensation on dehumidification with two existing mechanisms of fogging and film condensation.Based on the spot experimental data of DAP tail gas cooling and dehumidification in the region of 34%-57% reduction of steam fraction,the experimental results obtained are considerably consistent with the simulation results for the weight factor α=0.2.Two existing mechanisms of fogging and film condensation were validated accordingly.The heat transfer and mass transfer mechanism of condensation and dehumidification of high humidity industrial exhaust gases were reasonably described.

关 键 词：尾气 减排 机理 模拟 

分 类 号：TQ442[化学工程—化学肥料工业]