复合型湿式除尘器脱硫性能研究
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摘要
利用CFD技术对复合型湿式除尘器内部多相流场以及气液传质过程进行模拟,采用Realizable k-ε湍流模型在Euler坐标系下模拟除尘器内部气相的流动,采用DPM模型在Lagrange坐标系下描述液滴以及粉尘颗粒的运动轨迹,采用species transport多组分化学反应模型研究电机转速、喷淋液气比、入口烟气中SO_2浓度等运行参数对湿式除尘风机脱硫效率的影响。建立了复合型湿式除尘器脱硫实验系统,对除尘器的理论模型以及运行规律进行验证。结果表明:实验测得值和仿真模拟值误差均在10%以内,且脱硫效率变化规律一致,即随着电机转速、喷淋液气比以及Ca(OH)_2溶液pH的增大,脱硫效率明显上升;随着入口烟气中SO_2浓度的增大,脱硫效率降低。
Computational fluid dynamics(CFD) technology was used to simulate the multiphase flow field and gas-liquid mass transfer process inside the composite wet scrubber in this paper. Realizable k-ε turbulence model was applied to simulate the gas phase flow inside the scrubber under Euler coordinate, DPM model was used to describe the motion path-line of droplets and dust particles under Lagrange coordinate, and Species Transport multicomponent chemical reaction model was used to study the impact of motor rotating speed, liquid-gas ratio and inlet SO_2 concentration and other operating parameters on desulfurization efficiency within the wet fan. In addition, the desulfurization experimental system of composite wet scrubber was established to verify the theoretical model and operating law of composite wet scrubber. The results showed that the error between the measured value and the simulated value was within 10%, and the changing rule of the desulfurization efficiency was consistent, that was, with increase of the motor speed, spray liquid-gas ratio and the pH value of Ca(OH)_2 solution, the efficiency of desulphurization increased significantly; with increases of the concentration of SO_2 in the inlet flue gas, the desulfurization efficiency decreased.
Computational fluid dynamics(CFD) technology was used to simulate the multiphase flow field and gas-liquid mass transfer process inside the composite wet scrubber in this paper. Realizable k-ε turbulence model was applied to simulate the gas phase flow inside the scrubber under Euler coordinate, DPM model was used to describe the motion path-line of droplets and dust particles under Lagrange coordinate, and Species Transport multicomponent chemical reaction model was used to study the impact of motor rotating speed, liquid-gas ratio and inlet SO_2 concentration and other operating parameters on desulfurization efficiency within the wet fan. In addition, the desulfurization experimental system of composite wet scrubber was established to verify the theoretical model and operating law of composite wet scrubber. The results showed that the error between the measured value and the simulated value was within 10%, and the changing rule of the desulfurization efficiency was consistent, that was, with increase of the motor speed, spray liquid-gas ratio and the pH value of Ca(OH)_2 solution, the efficiency of desulphurization increased significantly; with increases of the concentration of SO_2 in the inlet flue gas, the desulfurization efficiency decreased.
引文
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[9] Kundu G Meikap B C. Modeling of a novel multi-stage bubble column scrubber for flue gas desulfurization[J]. Chemical Engineering Journal, 2002, 86(3): 331-342.
[10] Cara J, Vargas M, Morán A, et al. Biodesulphurization of a coal by packed-column leaching. Simultaneous thermogravimetric and mass spectrometric analyses[J]. Fuel, 2006, 85(12):1756-1762.
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[12] Chen C C. Toward development of activity coefficient models for process and product design of complex chemical systems[J]. Cheminform, 2006, 241(1/2): 103-112.
[13] 李立清,胡蔷,黄贵杰,等. 环栅喷淋泡沫塔欧拉—离散相模型三相除尘模拟[J]. 中国电机工程学报, 2012, 32(5): 68-77.
[14] 王福军. 计算流体动力学分析[M]. 北京: 清华大学出版社, 2004.
[15] Ten Cate A,Sundaresan S. Analysis of unsteady forces in ordered arrays of monodisperse spheres[J]. Journal of Fluid Mechanics, 2006, 552: 257-287.
[16] 居静, 钟文琪, 李颖,等. 旋转喷雾塔Ca(OH)2/NaClO2联合脱硫脱硝数值模拟[J]. 东南大学学报(自然科学版), 2014(5):968-974.
[2] 阚竟生, 沈恒根, 刘兴成. 火电厂燃煤锅炉系统湿量平衡分析与计算[J]. 环境工程, 2016, 34(5):91-94.
[3] 朱金伟, 张凡, 王洪昌,等. 燃煤烟气脱硫脱硝技术的发展趋势[J]. 环境工程技术学报, 2015, 5(3):200-204.
[4] Anthony E J, Bulewicz E M, Jia L. Reactivation of limestone sorbents in FBC for SO2, capture[J]. Progress in Energy & Combustion Science, 2007, 33(2):171-210.
[5] 李彩亭, 李珊红, 李思民,等. 斜板湿式除尘脱硫器气流流场模拟[J]. 湖南大学学报(自科版), 2006, 33(5):110-113.
[6] 周长丽, 李建锁. 表面活性剂在湿法烟气脱硫除尘中的应用[J]. 洁净煤技术, 2006, 12(2):72-74.
[7] 张杨帆, 李定龙, 王晋. 我国烟气脱硫技术的发展现状与趋势[J]. 环境科学与管理, 2006, 31(4):124-128.
[8] Warych J, Szymanowski M. Optimum values of process parameters of the “wet limestone flue gas desulfurization system”[J]. Chemical Engineering & Technology, 2015, 25(4):427-432.
[9] Kundu G Meikap B C. Modeling of a novel multi-stage bubble column scrubber for flue gas desulfurization[J]. Chemical Engineering Journal, 2002, 86(3): 331-342.
[10] Cara J, Vargas M, Morán A, et al. Biodesulphurization of a coal by packed-column leaching. Simultaneous thermogravimetric and mass spectrometric analyses[J]. Fuel, 2006, 85(12):1756-1762.
[11] JohnstoneH F, Singh A D. Recovery of sulfur dioxide from waste gases[J]. Ind Eng Chem, 2002, 27(8): 1037-1049.
[12] Chen C C. Toward development of activity coefficient models for process and product design of complex chemical systems[J]. Cheminform, 2006, 241(1/2): 103-112.
[13] 李立清,胡蔷,黄贵杰,等. 环栅喷淋泡沫塔欧拉—离散相模型三相除尘模拟[J]. 中国电机工程学报, 2012, 32(5): 68-77.
[14] 王福军. 计算流体动力学分析[M]. 北京: 清华大学出版社, 2004.
[15] Ten Cate A,Sundaresan S. Analysis of unsteady forces in ordered arrays of monodisperse spheres[J]. Journal of Fluid Mechanics, 2006, 552: 257-287.
[16] 居静, 钟文琪, 李颖,等. 旋转喷雾塔Ca(OH)2/NaClO2联合脱硫脱硝数值模拟[J]. 东南大学学报(自然科学版), 2014(5):968-974.
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