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A model for performance optimization of wet flue gas desulfurization systems of power plants

机译：电厂湿法烟气脱硫系统性能优化模型

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摘要

In this paper,a model of limestone/gypsum wet flue gas desulfurization(WFGD)system was developed based on unsteady theory.The models of processes of absorption section and oxidation section were developed and incorporated into the WFGD integral model.The submodel of motion of slurry drops,absorption of SO2,dissolution of limestone and crystallization of gypsum were included in the model of absorption section,while the model of oxidation section was developed by the population balance theory.The calculation results of the desulfurization system for 300 MW utility in China by this model was compared to that of corresponding measured results.The simulation results agreed with the measurement results very well.The operation mode of boilers of power plant in China is different to that of other countries since variable coal property and unstable loads of boilers.The differences of operation mode lead to the variation of process parameters of WFGD system.The influences of liquid-to-gas ratio,SO2 concentration of inlet flue gas,and combination mode of different spray levels to the desulfurization efficiency were analyzed.Based on the analysis,some advices of performance optimization of flue gas desulfurization systems in China were suggested.
机译：本文基于非稳态理论建立了石灰石/石膏湿法烟气脱硫（WFGD）系统模型，建立了吸收段和氧化段的过程模型，并将其纳入WFGD积分模型。吸收段模型包括了浆滴，SO2的吸收，石灰石的溶解和石膏的结晶，而氧化段的模型则是根据种群平衡理论而建立的。中国300 MW电厂脱硫系统的计算结果仿真结果与实测结果吻合较好。我国电厂锅炉的运行方式与其他国家不同，因为煤的性质可变，锅炉负荷不稳定。操作方式的差异导致了WFGD系统工艺参数的变化。液气比的影响，分析了进口烟气中的SO2浓度，以及不同喷雾水平对脱硫效率的组合方式。在此基础上，提出了我国烟气脱硫系统性能优化的一些建议。

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