磷石膏悬浮液强化氨法脱碳尾气微量氨吸收  

Enhanced absorption of dilute ammonia emission from ammonia-based CO_2 capture process by gypsum slurry

作　　者：张趁华[1] 李季[1] 朱家骅[1] 周加贝[1] 夏素兰[1] 银登国 

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《环境工程学报》2016年第8期4377-4381,共5页Chinese Journal of Environmental Engineering

基　　金：国家科技支撑计划项目(2013BAC12B01)

摘　　要：以强化氨法脱碳尾气微量氨吸收为目的,提出了以磷石膏悬浮液代替清水吸收尾气微量氨的新方法。分析了磷石膏悬浮液强化吸收氨与二氧化碳过程的热力学机理,绘制了Ca SO4·2H2O溶解影响下常温常压低浓度NH3-CO2-H2O体系气液平衡分压相图,并开展了模拟实验进行验证。实验结果表明,吸收过程中磷石膏悬浮液可改变吸收液的热力学性质,使吸收剂的平衡氨分压≤1 Pa,从而以较小的液气比、常温常压实现尾气氨≤10×10-6。Gypsum slurry was utilized as a new solvent and substitute for water to achieve enhanced absorption of dilute ammonia emitted from the ammonia-based CO2 capture process. The dilute concentration gas-liquid equilibrium pressure of the NH3-CO2-H2 O system,affected by dissolution of Ca SO4·2H2O,was calculated under room temperature and atmospheric pressure conditions. The thermodynamic mechanism of the simultaneous absorption of ammonia and carbon dioxide into gypsum slurry was analyzed and validated using simulated experiments. Compared with pure water,the gypsum slurry（ as a solvent with different thermodynamic characteristics）was found to decrease the equilibrium pressure of ammonia to below 1 Pa during the absorption process,and then achieve the super-low ammonia emission with relative low liquid-gas ratio.

关 键 词：磷石膏悬浮液 强化吸收 氨法脱碳 尾气微量氨 

分 类 号：X383[环境科学与工程—环境工程]