Numerical simulation of gas-liquid two-phase flow in a pneumatic emulsifying desulfurization cylinder
HOU Yining1,2,, HE Hongzhou1,2,,, ZHANG Jun1,2 1.Key Laboratory of Energy Cleaning Utilization and Development of Fujian Province, Jimei University, Xiamen 361021, China 2.Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Jimei University, Xiamen 361021, China
Abstract:In order to directly understand and analyze the gas-liquid two-phase flow mixing characteristics in the desulfurization cylinder of a large-scale wet desulfurization tower in a company, CFD technique was introduced to simulate the flow field. In this study, the effects of adding turbulators, changing turbulator angle and spray cone angle on the mixing characteristics were analyzed. The realizable k-ε model and DPM model, combined with SIMPLE algorithm were used to simulate the gas-liquid two-phase. The simulation results showed that adding turbulator and increasing spray cone angle could effectively improve the degree of gas-liquid two-phase turbulence mixing, and enhance the mass transfer efficiency of desulfurization reaction. Taking into consideration of the distribution of the flow field, the mixing degree of gas-liquid and the loss of energy, the best performance of the turbulator angle was between 30° to 36°. When the spray cone angle was between 120° to 180°, the distribution of spray liquid in the system was relatively uniform and the mixture with flue gas was sufficient, which was conducive to the desulfurization reaction. The results of the research provide references for the design, manufacturing and operation of the pneumatic emulsifying desulfurization cylinder in the large power desulfurization tower. Key words:pneumatic emulsifying desulfurization/ desulfurization cylinder/ gas-liquid two-phase flow/ numerical simulation/ turbulator/ spray cone angle.
图1脱硫筒结构与网格示意图 Figure1.Structure and mesh diagram of desulfurization cylinder
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1.Key Laboratory of Energy Cleaning Utilization and Development of Fujian Province, Jimei University, Xiamen 361021, China 2.Cleaning Combustion and Energy Utilization Research Center of Fujian Province, Jimei University, Xiamen 361021, China Received Date: 2020-03-30 Accepted Date: 2020-05-16 Available Online: 2021-01-13 Keywords:pneumatic emulsifying desulfurization/ desulfurization cylinder/ gas-liquid two-phase flow/ numerical simulation/ turbulator/ spray cone angle Abstract:In order to directly understand and analyze the gas-liquid two-phase flow mixing characteristics in the desulfurization cylinder of a large-scale wet desulfurization tower in a company, CFD technique was introduced to simulate the flow field. In this study, the effects of adding turbulators, changing turbulator angle and spray cone angle on the mixing characteristics were analyzed. The realizable k-ε model and DPM model, combined with SIMPLE algorithm were used to simulate the gas-liquid two-phase. The simulation results showed that adding turbulator and increasing spray cone angle could effectively improve the degree of gas-liquid two-phase turbulence mixing, and enhance the mass transfer efficiency of desulfurization reaction. Taking into consideration of the distribution of the flow field, the mixing degree of gas-liquid and the loss of energy, the best performance of the turbulator angle was between 30° to 36°. When the spray cone angle was between 120° to 180°, the distribution of spray liquid in the system was relatively uniform and the mixture with flue gas was sufficient, which was conducive to the desulfurization reaction. The results of the research provide references for the design, manufacturing and operation of the pneumatic emulsifying desulfurization cylinder in the large power desulfurization tower.