臭氧结合钙基湿法脱硫脱硝的模拟分析

Simulation Analysis of Desulfurization and Denitration based on the Method of Ozone Combined with Wet Calcium Based Scrubbing

为探讨钙基湿法脱硫系统对高价态氮氧化物的脱除能力,从热力学和动力学的角度,对Ca SO3协同吸收NO2与SO2进行了反应机理与吸收特性的模拟。构建了吸收反应的计算方法,分析了溶液p H值对传质速率的影响,计算得出吸收烟气体积与吸收浆液体积之比的临界值,模拟了不同NO2分压下NO2在Na2SO3和Ca SO3溶液中的传质速率。通过数值模拟和试验测量进行分析结果的校验,得到了较好的一致性。根据计算和试验结果,Na2SO3溶液对NO2的吸收效率随p H值的下降而减少,而Ca SO3对NO2的吸收效率随p H值变化不明显。研究结果对臭氧结合钙基湿法协同脱硫脱硝技术的研究发展及工业应用具有一定的参考价值。

To explore the removal effect of high nitrogen oxides on wet calcium based desulfurization system, the reaction mechanism and absorption properties of NO2 and SO2 simultaneous absorption by CaSO3 is conducted based on the point of thermodynamics and kinetics. The computing approach of absorption reaction is established and tbe effect of pH value on mass transfer rate is analyzed. By adopting this approach, the critical ratio of absorbed gas volume to solution volume is calculated, and the mass transfer rate is simulated in Na2SO3 and CaSO3 solutions with different NO2 gas partial pressures. The simulation results are verified against the testing results, which exhibit great consistency. According to the computing and testing results, the absorption rate of NO2 in Na2SO3 solution declines with the decrease of pH value, while no obvious change in CaSO3 solution is observed. These results can provide reference for the development and industrial application of ozone method combined with wet calcium based scrubbing.