氨法烟气脱硫工艺过程模拟与优化

Simulation and optimization of ammonia-based flue gas desulfurization process

为了进一步研究氨法烟气脱硫工艺过程,以非平衡级传质理论为依据,利用化工流程模拟软件Aspen Plus建立填料吸收塔脱除SO2过程的数值计算模型,分析和优化操作参数对脱硫效果的影响,模拟结果与文献值吻合较好。模型计算结果表明:脱硫率随着吸收液pH值和液气比的增大而增大;随着进口SO2质量浓度和进口烟气流量的增大而降低,并得出吸收液pH值及液气比在氨法烟气脱硫效率影响因素中占主要位置。所建立的氨法烟气脱硫工艺过程模型准确合理,模拟结果可为脱硫系统实际运行调节各操作参数对脱硫效果的影响提供参考和借鉴。

In order to further research ammonia-based flue gas desulfurization process, based on the non-equilibrium mass transfer theory, the model of SO/removal process in packing absorption tower was established by the chemical process simulation software Aspen Plus. The influence of operation parameters on the effect of the desulfurization was analyzed and optimized. The simulation results are basically consistent with the actual process data. The simulated data show that the desulfurization rate increases with the increase of pH value and the volume ratio of liquid to gas （VL/VG） ,but reduces with the increase of import SO2 mass concentration and import flue gas flow. It concludes that pH value and VL/VG are in the main position of influence factors of ammonia-based flue gas desulfurization process. The model was set up to be accurate and reasonable, and the results can provide information and reference to the influence of operational parameters in the actual operation of the flue gas desulfurization system on the desulfurization effect.