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氨法吸收CO2过程的传热/传质及反应模型研究

DOI: 10.13334/j.0258-8013.pcsee.2014.23.001, PP. 3836-3842

Keywords: 传热/传质模型,反应模型,CO2吸收,氨水,Murphree效率

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Abstract:

以氨法吸收CO2过程为研究对象,针对气液两相之间传热/传质及反应模型的区别,对比了RK(rate-based,kinetic),RC(rate-based,chemistry),EK(equilibrium-based,kinetic)andEC(equilibrium-based,chemistry)4种模型对CO2吸收过程中CO2吸收速率、富液碳化度、出口NH3浓度等关键目标参数的预测能力。模拟结果显示,RK模型对氨法CO2吸收过程具有最佳的预测能力。引入Murphree效率可修正基于平衡的模型对气液两相间传热/传质的预测,但是需要考虑到Murphree效率因组分而异并能逐级改变的局限。通过对Kinetic反应模型中动力学反应的敏感性分析发现,氨法吸收二氧化碳的过程主要受下述反应控制:NH3?CO2?H2O→NH2COO-?H3O。

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