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Simulation and Optimization of Defluorination and Desulfurization Processes of Aluminum Electrolysis Flue Gas

机译：铝电解烟气脱氟脱硫过程的模拟与优化

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Aiming at the harmful gas pollutants of low concentration sulfur dioxide and fluoride in electrolytic aluminum flue gas, the process of fluorine and sulfur removal was simulated by NaOH-CO_2 gas-liquid absorption system, and the influence of operation and structure parameters such as gas flow rate, liquid flow rate, size, and type of filler on gas-liquid mass transfer process was explored. The results show that the gas flow rate is 1.5-2.0 m~3/h, the liquid flow rate is 10-12 m~3/h, and the filler is a Bauer ring with the nominal diameter (DN) of 16 mm, the gas-liquid mass transfer effect is the best and the maximum CO_2 utilization rate is about 46%. According to the simulation results, when ammonia system is used to absorb sulfur dioxide and hydrogen fluoride, the concentration of sulfur dioxide and hydrogen fluoride can be reduced to 42 mg/m~3 and 0.8 mg/ m~3, respectively.
机译：针对电解铝烟气中的低浓度二氧化硫和氟化物等有害气体污染物，采用NaOH-CO_2气液吸收系统对其脱氟脱硫过程进行了模拟，探讨了操作和结构参数如气体流量、液体流量、填料粒径和类型对气液传质过程的影响。结果表明，气体流速为1.5～2.0m3/h，液体流速为10～12m3/h，填料为公称直径16mm的鲍尔环，气液传质效果最好，最大CO_2利用率约为46%。根据模拟结果，当采用氨系统吸收二氧化硫和氟化氢时，二氧化硫和氟化氢的浓度可分别降低到42mg/m3和0.8mg/m3。

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