采用双流体模型、RNG k??湍流模型和组分输运模型对不同工况下自吸式文丘里洗涤器内NaOH溶液洗消H2S气体的引射能力、气液混合度和洗涤效率进行数值模拟，对引射量的模拟结果进行了实验验证. 结果表明，在气液流动过程中，随气速增大，自吸式文丘里洗涤器引射量增大，洗涤器扩大段内液相径向分布均匀性减弱，液相倾向于贴壁流动. 距喉部越远，气液速度越低，液相径向分散越均匀. 在H2S碱液吸收过程中，气液相间化学反应主要集中于喉部至喉部上方扩大段长度1/5区域内，反应速率随距喉部距离增加先升高后降低. 最大反应速率在喉部上方扩大段长度5%处. 随气速增大，扩大段内气液相间化学反应速率提高，洗涤器出口处H2S浓度降低，洗涤效率增大，洗涤时间缩短.
Venturi scrubbers are widely applied in gas adsorption and industrial dedusting fields as they have advantages of simple structure, high efficiency and convenient operation. Nowadays, computational fluid dynamics (CFD) method has become a more efficient and useful tool to explore the gas liquid flow characteristics and mass transfer process in Venturi scrubbers as the development of computing ability. Based on the process of hydrogen sulfide gas absorption by sodium hydroxide solution in a self-priming Venturi scrubber, the injection ability, mixing degree as well as scrubbing efficiency at different operation conditions were studied by using the two fluid models, the RNG k?? turbulent model and the species transport model in CFD method. The accuracy of simulated injection flow rates were verified by the experimental data. The simulation results showed that, with increase of gas velocity, the injection flow rate increased, but the homogeneity of radial liquid dispersion in the diffuser became worse. The liquid phase was inclined to flow near the wall, which did not benefit for the hydrogen sulfide absorption process. With the increase of the distance above the throat, the velocities of gas and liquid decreased, resulting in more uniform radial liquid dispersion. In the hydrogen sulfide absorption process, the interphase chemical reaction mainly occurred in one fifth of the diffuser above the throat. In this area, the interphase chemical reaction rate increased and then decreased with the increasing distance above the throat. Therefore, the highest chemical reaction rate did not occur at the throat, but at nearly 5% of the diffuser above the throat. As the gas velocity increased, the interphase chemical reaction rate and scrubbing efficiency became higher, while the hydrogen sulfide concentration and scrubbing time decreased. The research findings provided the basis for the optimization of structure parameters and operation conditions in self-priming Venturi scrubbers.
[1]Rudnick S N, Koehler J, Martin K P, et al.Particle collection efficiency in a venturi scrubber: comparison of experiments with theory[J].Environmental Science & Technology, 1986, 20(3):237-242 [2]周艳民, 孙中宁, 谷海峰, 等.自吸式文丘里洗涤器引射特性及其影响因素[J].化工学报, 2015, 66(1):99-104 [3]王盟, 孙中宁, 谷海峰, 等.自吸式文丘里水洗器阻力特性实验研究[J].原子能科学技术, 2012, 46(11):1353-1356 [4]段振亚, 胡金榜, 宗润宽, 等.文丘里洗涤器压力损失计算模型[J].天津大学学报, 2004, 37(10):863-867 [5]段振亚, 张俊梅, 张伟湘.文丘里洗涤器脱硫性能研究[J].石油化工设备, 2008, 37(1):24-27 [6]周艳民, 孙中宁, 谷海峰, 等.自吸式文丘里水洗器引射特性研究[J].原子能科学技术, 2015, 49(6):1075-1079 [7] Zhou Y M, Sun Z N, Gu H F, et al.Structure design on improving injection performance for venturi scrubber working in self-priming mode[J].Progress in Nuclear Energy, 2015, 80:7-16 [8] Zhou Y M, Sun Z N, Gu H F, et al.Experimental research on aerosols collection performance of self-priming venturi scrubber in FCVS[J].Progress in Nuclear Energy, 2015, 85:771-777 [9] 王盟.文丘里洗涤器过滤性能研究[J].哈尔滨工程大学, 2012, :- [10] Gulhane N P, Landge A D, Shukla D S, et al.Experimental study of iodine removal efficiency in self-priming venturi scrubber[J].Annals of Nuclear Energy, 2015, 78:152-159 [11] Mayinger F, Lehner M.Operating results and aerosol deposition of a Venturi of a scrubber in self-priming operation[J].[J].Chemical Engineering and Processing, 1995, 34:283-288 [12] Horiguchi N, Yoshida H, Abe Y.Numerical simulation of two-phase flow behavior in Venturi scrubber by interface tracking method[J].Nuclear Engineering and Design, 2016, 210:580-586 [13]Mohebbi A, Taheri M, Fathikaljahi J, Talaie M R.Simulation of an orifice scrubber performance based on EulerianLagrangian method[J].Journal of Hazardous Materials, 2003, 100(1-3):13-25 [14] Majid A, Yan C Q, Sun Z N, Wang J J, Gu H F.CFD simulation of dust particle removal efficiency of a venturi scrubber in CFX[J].Nuclear Engineering and Design, 2013, 256:169-177 [15] 朱立博.矩形截面文丘里洗涤器的数值模拟研究[D]. 安徽理工大学, 2016. [16] Ahmadvand F, Talaie M R.CFD modeling of droplet dispersion in a venturi scrubber[J].Chemical Engineering Journal, 2010, 160:423-431 [17]常加富, 董玉平, 刘庆磊, 等.文丘里洗涤器净化生物质燃气流场数值模拟及试验研究[J].农业工程学报, 2012, 28(21):186-192 [18] 范晓丹.鼓泡反应器中氢氧化钠吸收二氧化碳的数值模拟[D]. 东北大学, 2014. [19]杨兰和, 刘淑琴, 梁杰, 等.废碱液同时吸收和方法与传质模型的研究[J].煤炭学报, 2003, 28(1):64-68 [20] 陈赓良.硫化氢在碱性介质中吸收的反应机理和动力学[J].天然气工业, 1983, :50-59
