转炉一次除尘新OG系统高效喷淋塔喷嘴雾化特性的模拟
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摘要
利用离散相模型对转炉一次除尘新OG系统高效喷淋塔内喷嘴的雾化特性进行模拟,分析了喷射角度、喷射压力、喷射流量及喷嘴水平间距等因素对雾化场索太尔平均直径(SMD)和蒸发效率的影响.结果表明,在一定范围内随喷射角度增加,液滴在雾化场中的覆盖面增大,液滴驻留时间变长,蒸发效率增加,雾化场SMD减小,喷射角度大于60°时,SMD值减小缓慢.随喷射压力增大,液滴蒸发效率增加,雾化场SMD减小,压力大于1.0 MPa时对SMD的影响较小.随喷射流量增加,液滴蒸发效率减小,雾化场SMD增加,流量小于0.15 kg/s时,SMD增加幅度偏小.两喷嘴水平间距越大,液滴分布面积越大,但对雾化场SMD影响较小.在一定条件下,喷嘴间距约为800 mm时,截面速度分布较均匀.
The gas-liquid two-phase coupled flow of the atomization field in the nozzle of the high efficiency spray tower of new oxygen converter gas recovery(OG) system of primary dedusting system for converter was simulated by using the discrete phase model. The influences of the spray angle, the atomizer pressure, the atomizer mass flow rate and the horizontal distance between two nozzles on Sauter mean diameter(SMD) and the evaporation efficiency of the atomization field were analyzed. The results showed that with the increase of the spray angle, the coverage of the droplet in the atomization field was wider, the droplet residence time was longer, the evaporation efficiency of the droplets increased, and the SMD of the atomization field decreased. When the injection angle was greater than 60°, the SMD decreased slowly. With the spray pressure increased, the evaporation efficiency of the droplets increased, and the atomization field SMD decreased. When the pressure was greater than 1.0 MPa, the influence of the spray pressure on SMD was small. With the increase of jet mass flow rate, the evaporation efficiency of the droplets decreased, and the SMD of the atomization field increased. When the flow rate was less than 0.15 kg/s, the SMD had not much increase. The larger the horizontal distance between two nozzles, the wider the droplet distribution, but the horizontal distance had less impact on the atomization field SMD. Under certain conditions, when the nozzle distance was about 800 mm, the cross-sectional velocity distribution was more uniform.
The gas-liquid two-phase coupled flow of the atomization field in the nozzle of the high efficiency spray tower of new oxygen converter gas recovery(OG) system of primary dedusting system for converter was simulated by using the discrete phase model. The influences of the spray angle, the atomizer pressure, the atomizer mass flow rate and the horizontal distance between two nozzles on Sauter mean diameter(SMD) and the evaporation efficiency of the atomization field were analyzed. The results showed that with the increase of the spray angle, the coverage of the droplet in the atomization field was wider, the droplet residence time was longer, the evaporation efficiency of the droplets increased, and the SMD of the atomization field decreased. When the injection angle was greater than 60°, the SMD decreased slowly. With the spray pressure increased, the evaporation efficiency of the droplets increased, and the atomization field SMD decreased. When the pressure was greater than 1.0 MPa, the influence of the spray pressure on SMD was small. With the increase of jet mass flow rate, the evaporation efficiency of the droplets decreased, and the SMD of the atomization field increased. When the flow rate was less than 0.15 kg/s, the SMD had not much increase. The larger the horizontal distance between two nozzles, the wider the droplet distribution, but the horizontal distance had less impact on the atomization field SMD. Under certain conditions, when the nozzle distance was about 800 mm, the cross-sectional velocity distribution was more uniform.
引文
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[13]潘阳敏,罗祎青,王丽雯,等.压力旋流式喷嘴喷淋液膜区换热过程的数值模拟[J].化工学报,2017,68(2):575-583.Pan Y M,Luo Y Q,Wang L W,et al.Numerical Simulations on Sheet Region of Spray Cooling Process of Pressure-swirl Nozzle[J].Journal of Chemical Industry and Engineering(China),2017,68(2):575-583.
[14]Qin C,Loth E.Numerical Description of a Pressure-swirl Nozzle Spray[J].Chem.Eng.Process.Process Intensif.,2016,107:68-79.
[15]聂涛.旋流式喷嘴雾化特性研究[D].太原:太原理工大学,2016:25-29.Nie T.Study on Atomization Characteristics of Swirl Nozzle[D].Taiyuan:Taiyuan University of Technology,2016:25-29.
[16]Broniarz-Press L,W?odarczak S,Matuszak M,et al.The Effect of Orifice Shape and the Injection Pressure on Enhancement of the Atomization Process for Pressure-swirl Atomizers[J].Crop Prot.,2016,82:65-74.
[17]Hemmati A,Torab-Mostaedi M,Shirvani M,et al.A Study of Drop Size Distribution and Mean Drop Size in a Perforated Rotating Disc Contactor(PRDC)[J].Chem.Eng.Res.Des.,2015,96:54-62.
[18]林鸿亮,刘道银,刘猛,等.喷嘴雾化特性的试验及数值模拟[J].动力工程学报,2015,35(12):998-1005.Lin H L,Liu D Y,Liu M,et al.Experimental Study and Numerical Simulation on Spray Characteristics of Different Nozzles[J].Journal of Chinese Society of Power Engineering,2015,35(12):998-1005.
[2]马春生.转炉烟气净化与回收工艺[M].北京:冶金工业出版社,2014:113-117.Ma C S.Converter Gas Purification and Recovery System[M].Beijing:Metallurgical Industry Press,2014:113-117.
[3]侯燕,陶毓伽,淮秀兰.多喷嘴喷雾场数值模拟分析[J].工程热物理学报,2012,33(8):1362-1366.Hou Y,Tao Y J,Huai X L.Numerical Simulation and Analysis of Multi-nozzle Spray Cooling[J].Journal of Engineering Thermophysics,2012,33(8):1362-1366.
[4]贾莹.压力旋流式喷嘴干涉的数值模拟[D].大连:大连理工大学,2014:40-54.Jia Y.Numerical Simulation of Pressure Swirl Nozzle Interference[D].Dalian:Dalian University of Technology,2014:40-54.
[5]陈曦,葛少成,张忠温,等.基于Fluent多喷嘴喷雾干涉数值模拟分析[J].环境工程学报,2014,8(6):2503-2508.Chen X,Ge S C,Zhang Z W,et al.Numerical Simulation and Analysis of Multi-nozzle Interference Base on Fluent[J].Chinese Journal of Environment Engineering,2014,8(6):2503-2508.
[6]Rashad M,Huang Y,Zheng Z.Effect of Geometric Parameters on Spray Characteristics of Pressure Swirl Atomizers[J].Int.J.Hydrogen Energy,2016,41(35):15790-15799.
[7]Pereira R H,Braga S L,Parise J A R.Single Phase Cooling of Large Surfaces with Square Arrays of Impinging Water Sprays[J].Appl.Therm.Eng.,2012,36:161-170.
[8]陈斌,郭烈锦,张西民,等.喷嘴雾化特性实验研究[J].工程热物理学报,2001,22(2):237-240.Chen B,Guo L J,Zhang X M,et al.Experimental Investigation of Spray Characteristics of Different Nozzle[J].Journal of Engineering Thermophysics,2001,22(2):237-240.
[9]李兆东,鄢璐,王小明,等.湿法烟气脱硫喷淋塔不同喷嘴布置雾化性能比较试验[J].热能动力工程,2008,23(3):303-305.Li Z D,Yan L,Wang X M,et al.Tests for Comparing the Atomization Performance of a Wet-method Flue-gas Desulfurization Spray Tower at Different Nozzle Arrangements[J].Journal of Engineering for Thermal Energy and Power,2008,23(3):303-305.
[10]Liu X,Xue R,Ruan Y,et al.Flow Characteristics of Liquid Nitrogen through Solid-cone Pressure Swirl Nozzles[J].Appl.Therm.Eng.,2017,110:290-297.
[11]高继慧,陈国庆,高建民,等.半干法压力旋流式喷嘴雾化性能数值模拟[J].哈尔滨工业大学学报,2010,42(3):437-441.Gao J H,Chen G Q,Gao J M,et al.Numerical Simulation on Atomizing Performance of Pressure Swirl Nozzle for Semi-drying FGD[J].Journal of Harbin Institute of Technology,2010,42(3):437-441.
[12]刘洋.半干法烟气脱硫压力式雾化喷嘴特性研究[D].哈尔滨:哈尔滨工业大学,2014:8-12.Liu Y.Characterization Study of Pressure Atomizing Nozzle for Semi-dry Flue Gas Desulfurization[D].Harbin:Harbin Institute of Technology,2014:8-12.
[13]潘阳敏,罗祎青,王丽雯,等.压力旋流式喷嘴喷淋液膜区换热过程的数值模拟[J].化工学报,2017,68(2):575-583.Pan Y M,Luo Y Q,Wang L W,et al.Numerical Simulations on Sheet Region of Spray Cooling Process of Pressure-swirl Nozzle[J].Journal of Chemical Industry and Engineering(China),2017,68(2):575-583.
[14]Qin C,Loth E.Numerical Description of a Pressure-swirl Nozzle Spray[J].Chem.Eng.Process.Process Intensif.,2016,107:68-79.
[15]聂涛.旋流式喷嘴雾化特性研究[D].太原:太原理工大学,2016:25-29.Nie T.Study on Atomization Characteristics of Swirl Nozzle[D].Taiyuan:Taiyuan University of Technology,2016:25-29.
[16]Broniarz-Press L,W?odarczak S,Matuszak M,et al.The Effect of Orifice Shape and the Injection Pressure on Enhancement of the Atomization Process for Pressure-swirl Atomizers[J].Crop Prot.,2016,82:65-74.
[17]Hemmati A,Torab-Mostaedi M,Shirvani M,et al.A Study of Drop Size Distribution and Mean Drop Size in a Perforated Rotating Disc Contactor(PRDC)[J].Chem.Eng.Res.Des.,2015,96:54-62.
[18]林鸿亮,刘道银,刘猛,等.喷嘴雾化特性的试验及数值模拟[J].动力工程学报,2015,35(12):998-1005.Lin H L,Liu D Y,Liu M,et al.Experimental Study and Numerical Simulation on Spray Characteristics of Different Nozzles[J].Journal of Chinese Society of Power Engineering,2015,35(12):998-1005.
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