石灰石—湿法烟气脱硫吸收塔仿真模型设计与研究
|
摘要
石灰石—湿法烟气脱硫涉及的传质及化学反应过程非常复杂,深入研究其内部机理,建立高精度的机理模型,有助于提高脱硫现场的运行水平。对吸收塔进行区域划分,明确不同区域的建模目标。二氧化硫吸收区依据浆液滴下落距离及暴露时间细划成不同高度的"小室",根据"小室"内浆液滴的运动特征及传质过程,计算"小室"内脱硫效率及压降,进而获得整个区域的吸收效率及压降计算方法;浆液区PH值被描述成浆液中主要组分浓度的函数;除雾区压降依据烟气流速分成低速和高速两段计算。借助具体实例仿真,验证了模型的精度。
The mass transfer and chemical reaction processes of wet flue gas desulfurization(FGD) are very complex. It is helpful to improve the operation level of desulfurization site by studying the internal mechanism and establishing a high precision mechanism model. The absorption tower is divided into some regions, and the modeling targets in different regions are determined. The sulfur dioxide absorption region is divided into different heights of the "cell" by the slurry droplet falling distance and exposure time. According to the motion characteristics and mass transfer process, the desulfurization efficiency and pressure drop are calculated, and the absorption efficiency calculation method and the pressure drop across the region are obtained; the PH value of the slurry zone is described as a function of the concentration of the major components in the slurry; the mist pressure drop according to velocity of flue gas is divided into low and high speeds for two stage calculations. The accuracy of the model is verified by simulation.
The mass transfer and chemical reaction processes of wet flue gas desulfurization(FGD) are very complex. It is helpful to improve the operation level of desulfurization site by studying the internal mechanism and establishing a high precision mechanism model. The absorption tower is divided into some regions, and the modeling targets in different regions are determined. The sulfur dioxide absorption region is divided into different heights of the "cell" by the slurry droplet falling distance and exposure time. According to the motion characteristics and mass transfer process, the desulfurization efficiency and pressure drop are calculated, and the absorption efficiency calculation method and the pressure drop across the region are obtained; the PH value of the slurry zone is described as a function of the concentration of the major components in the slurry; the mist pressure drop according to velocity of flue gas is divided into low and high speeds for two stage calculations. The accuracy of the model is verified by simulation.
引文
[1]郭东明.脱硫工程技术与设备[M].北京:化学工业出版社,2011.Guo Dongming.Desulfurization Engineering Technology and Equipment[M].Beijing:Chemical Industry Press,2011.
[2]赵永椿,马斯鸣,杨建平,等.燃煤电厂污染物超净排放的发展及现状[J].煤炭学报,2015,40(11):2629-2640.Zhao Yongchun,Ma Siming,Yang Jianping,et al.Status of ultra-low emission technology in coal-fired power plant[J].Journal of China Coal Society,2015,40(11):2629-2640.
[3]林永明,高翔,施平平,等.大型湿法烟气脱硫喷淋塔内阻力特性数值模拟[J].中国电机工程学报,2008,28(5):28-33.Lin Yongming,Gao Xiang,Shi Pingping,et al.Numerical Simulation on Resistance Characteristic of Large Scale Wet Flue Gas Desulphurization Spraying Scrubber[J].Proceedings of the CSEE,2008,28(5):28-33.
[4]周山明,金保升,仲兆平,等.大型烟气脱硫塔的流体动力学模拟及优化设计[J].东南大学学报(自然科学版),2005,35(1):105-110.Zhou Shanming,Jin Baosheng,Zhong Zhaoping,et al.Flow simulation for large scale FGD scrubbers and optimization design[J].JOURNAL OF SOUTHEA-STUNIVERSITY(Natural Science Edition),2005,35(1):105-110.
[5]Marocco L,Inzoli F.Multiphase Euler-Lagrange CFDsimulation applied to Wet Flue Gas Desulphurisation technology[J].International Journal of Multiphase Flow(S0301-9322),2009,35(2):185-194.
[6]Kerdouss F,Bannari A,Proulx P.CFD Modeling of Gas Dispersion and BubbleSize in a Double[J].Chemical Engineering Science(S0009-2509),2006,61:3313-3322.
[7]刘嘉宇,刘亚明,郝雅洁,等.湿法脱硫塔内脱硫浆液运动特性[J].中南大学学报(自然科学版),2016,47(1):330-337.Liu Jiayu,Liu Yaming,Hao Yajie,et al.Motion characteristics of gypsum slurry in wet-type desulphurization tower[J].Journal of Central South University(Science and Technology),2016,47(1):330-337.
[8]丁开翔,郭永红,王勇强,等.不同喷淋层布置的脱硫塔流场优化数值模拟[J].电站系统工程,2016,32(1):24-27.
[9]Ding Kai-xiang,Guo Yong-hong,Wang Yong-qiang,et al.Flow Fie1d Optimization of FGD Under Different Spray Levels Operation by Numerical Simulation[J].Power System Engineering,2016,32(1):24-27.
[10]钟允攀,陈颂英,王瑞岩,等.旋转射流搅拌石灰浆池气液两相流特性研究[J].工程热物理学报,2016,37(9):1875-1883.Zhong Yun-pan,Chen Song-ying,Wang Rui-yan,et al.Research on the Gas-Liquid Two-Phase Flow in the Lime Slurry Pool Based on Rotary Jet Mixing[J].Journal of Engingeering Thermophysics,2016,37(9):1875-1883.
[11]潘丹萍,郭彦鹏,黄荣廷,等.石灰石-石膏法烟气脱硫过程中细颗粒物形成特性[J].化工学报,2015,66(11):4618-4625.Pan Danping,Guo Yanpeng,Huang Rongting,et al.Formation of fine particles in flue gas desulphurization process using limestone-gypsum[J].CIESC Journal,2015,66(11):4618-4625.
[12]彭朝辉,童志权.亚硫酸钙氧化为石膏的研究[J].中国计量学院学报,2002,13:139-157.Peng Zhao-hui,Tong Zhi-quan.Study on the oxidation of calcium sulfite to gypsum[J].Journal of China Institute of Metrology,2002,13:139-157.
[13]汪黎东.烟气脱硫添加剂对正盐生成促进的实验研究[D].北京:华北电力大学,2005.Wang Lidong.Experimental studies on accelerating effect of flue gas desulfurization additives for formation of sulfate[D].Beijing:North China Electric Power University,2005.
[14]赵博,李彦,佟会玲,等.亚硫酸盐强制氧化传递与化学反应动力学[J].化工学报,2005,56(11):2059-2064.Zhao Bo,Li Yan,Tong Huiling,et al.Mass transfer and kinetics of sulfite forced oxidation reaction[J].Journal of Chemical Industry and Engineering,2005,56(11):2059-2064.
[15]赵毅,汪黎东,王小明,等.烟气脱硫产物-亚硫酸钙非催化氧化的宏观反应动力学研究[J].中国电机工程学报,2005,25(8):116-120,129.Zhao Yi,Wang Li-dong,Wang Xiao-ming,et al.STUDYON THE MACROSCOPICAL UNCATALYZEDOXIDATION KINETICS OF DESULFURIZATIONRESIDUAL PRODUCT-CALCIUM SULFITE[J].Proceedings of the CSEE,2005,25(8):116-120,129.
[16]霍旺.石灰石-石膏湿法脱硫过程的吸收、氧化及结晶机理研究[D].杭州:浙江大学,2009.Huo Wang.Mechanism Research on the absorption、Oxidation and Crystallization in the Process of Limstone-Gypsum WFGD[D].Hangzhou:Zhejiang University,2009.
[17]张晓东,杜云贵,郑永刚,等.湿法脱硫的一维数值计算模型[J].中国电机工程学报,2008,28(14):15-19.Zhang Xiao-dong,Du Yun-gui,Zheng Yong-gang,et al.One-dimensional Numerical Modeling of Wet Flue Gas Desulfurization Process[J].Proceedings of the CSEE,2008,28(14):15-19.
[18]陈鸿伟,牛治国,高建强.烟气脱硫喷淋塔实时仿真模型研究[J].电站系统工程,2006,22(4):4-6.Chen Hong-wei,Niu Zhi-guo,Gao Jian-qiang.Study on Real-time Simulation Model of Spray Scrubber[J].Power System Engineering,2006,22(4):4-6.
[19]何祖威,张华伟,展锦程,等.660 MW机组湿法烟气脱硫喷淋塔的简化模型及仿真验证[J].重庆大学学报,2009,32(10):1169-1173.HE Zu-wei,ZHANG Hua-wei,ZHAN Jing-cheng,et al.Simplifying and validating the model of wet flue gas desulphurization spray tower for 660MW units[J].Journal of Chongqing University,2009,32(10):1169-1173.
[20]王永文,冷伟.湿法脱硫塔动态特性仿真建模[J].发电设备,2016,30(5):319-324.Wang Yongwen,Leng Wei.Simulation and Modeling on Dynamic Characteristics of a Wet Desulfurization Tower[J].POWER EQUIPMENT,2016,30(5):319-324.
[21]Norman Kirk Yeh.Liquid Phase Mass Transfer in Spray Contactors[D].Austin:The University of Texas at Austin,2002.
[22]林宗虎.气液两相流和沸腾传热[M].西安:西安交通大学出版社,2003.Lin Zonghu.Gas-liquid two-phase flow and boiling heat transfer[M].Xi'an:Xi'an Jiaotong University Press,2003.
[23]杜谦,吴少华,朱群益,等.湿法烟气脱硫环境下亚硫酸钙的非催化氧化[J].化工学报,2003,54(10):1490-1493.DU Qian,WU Shaohua,ZHU Qunyi,et al.NON-CATALYTIC OXIDATION KINETICS OFCALCIUM SULFITE IN WET LIMESTONE-GYPSUMFGD PROCESS[J].Journal of Chemical Industry and Engineering,2003,54(10):1490-1493.
[2]赵永椿,马斯鸣,杨建平,等.燃煤电厂污染物超净排放的发展及现状[J].煤炭学报,2015,40(11):2629-2640.Zhao Yongchun,Ma Siming,Yang Jianping,et al.Status of ultra-low emission technology in coal-fired power plant[J].Journal of China Coal Society,2015,40(11):2629-2640.
[3]林永明,高翔,施平平,等.大型湿法烟气脱硫喷淋塔内阻力特性数值模拟[J].中国电机工程学报,2008,28(5):28-33.Lin Yongming,Gao Xiang,Shi Pingping,et al.Numerical Simulation on Resistance Characteristic of Large Scale Wet Flue Gas Desulphurization Spraying Scrubber[J].Proceedings of the CSEE,2008,28(5):28-33.
[4]周山明,金保升,仲兆平,等.大型烟气脱硫塔的流体动力学模拟及优化设计[J].东南大学学报(自然科学版),2005,35(1):105-110.Zhou Shanming,Jin Baosheng,Zhong Zhaoping,et al.Flow simulation for large scale FGD scrubbers and optimization design[J].JOURNAL OF SOUTHEA-STUNIVERSITY(Natural Science Edition),2005,35(1):105-110.
[5]Marocco L,Inzoli F.Multiphase Euler-Lagrange CFDsimulation applied to Wet Flue Gas Desulphurisation technology[J].International Journal of Multiphase Flow(S0301-9322),2009,35(2):185-194.
[6]Kerdouss F,Bannari A,Proulx P.CFD Modeling of Gas Dispersion and BubbleSize in a Double[J].Chemical Engineering Science(S0009-2509),2006,61:3313-3322.
[7]刘嘉宇,刘亚明,郝雅洁,等.湿法脱硫塔内脱硫浆液运动特性[J].中南大学学报(自然科学版),2016,47(1):330-337.Liu Jiayu,Liu Yaming,Hao Yajie,et al.Motion characteristics of gypsum slurry in wet-type desulphurization tower[J].Journal of Central South University(Science and Technology),2016,47(1):330-337.
[8]丁开翔,郭永红,王勇强,等.不同喷淋层布置的脱硫塔流场优化数值模拟[J].电站系统工程,2016,32(1):24-27.
[9]Ding Kai-xiang,Guo Yong-hong,Wang Yong-qiang,et al.Flow Fie1d Optimization of FGD Under Different Spray Levels Operation by Numerical Simulation[J].Power System Engineering,2016,32(1):24-27.
[10]钟允攀,陈颂英,王瑞岩,等.旋转射流搅拌石灰浆池气液两相流特性研究[J].工程热物理学报,2016,37(9):1875-1883.Zhong Yun-pan,Chen Song-ying,Wang Rui-yan,et al.Research on the Gas-Liquid Two-Phase Flow in the Lime Slurry Pool Based on Rotary Jet Mixing[J].Journal of Engingeering Thermophysics,2016,37(9):1875-1883.
[11]潘丹萍,郭彦鹏,黄荣廷,等.石灰石-石膏法烟气脱硫过程中细颗粒物形成特性[J].化工学报,2015,66(11):4618-4625.Pan Danping,Guo Yanpeng,Huang Rongting,et al.Formation of fine particles in flue gas desulphurization process using limestone-gypsum[J].CIESC Journal,2015,66(11):4618-4625.
[12]彭朝辉,童志权.亚硫酸钙氧化为石膏的研究[J].中国计量学院学报,2002,13:139-157.Peng Zhao-hui,Tong Zhi-quan.Study on the oxidation of calcium sulfite to gypsum[J].Journal of China Institute of Metrology,2002,13:139-157.
[13]汪黎东.烟气脱硫添加剂对正盐生成促进的实验研究[D].北京:华北电力大学,2005.Wang Lidong.Experimental studies on accelerating effect of flue gas desulfurization additives for formation of sulfate[D].Beijing:North China Electric Power University,2005.
[14]赵博,李彦,佟会玲,等.亚硫酸盐强制氧化传递与化学反应动力学[J].化工学报,2005,56(11):2059-2064.Zhao Bo,Li Yan,Tong Huiling,et al.Mass transfer and kinetics of sulfite forced oxidation reaction[J].Journal of Chemical Industry and Engineering,2005,56(11):2059-2064.
[15]赵毅,汪黎东,王小明,等.烟气脱硫产物-亚硫酸钙非催化氧化的宏观反应动力学研究[J].中国电机工程学报,2005,25(8):116-120,129.Zhao Yi,Wang Li-dong,Wang Xiao-ming,et al.STUDYON THE MACROSCOPICAL UNCATALYZEDOXIDATION KINETICS OF DESULFURIZATIONRESIDUAL PRODUCT-CALCIUM SULFITE[J].Proceedings of the CSEE,2005,25(8):116-120,129.
[16]霍旺.石灰石-石膏湿法脱硫过程的吸收、氧化及结晶机理研究[D].杭州:浙江大学,2009.Huo Wang.Mechanism Research on the absorption、Oxidation and Crystallization in the Process of Limstone-Gypsum WFGD[D].Hangzhou:Zhejiang University,2009.
[17]张晓东,杜云贵,郑永刚,等.湿法脱硫的一维数值计算模型[J].中国电机工程学报,2008,28(14):15-19.Zhang Xiao-dong,Du Yun-gui,Zheng Yong-gang,et al.One-dimensional Numerical Modeling of Wet Flue Gas Desulfurization Process[J].Proceedings of the CSEE,2008,28(14):15-19.
[18]陈鸿伟,牛治国,高建强.烟气脱硫喷淋塔实时仿真模型研究[J].电站系统工程,2006,22(4):4-6.Chen Hong-wei,Niu Zhi-guo,Gao Jian-qiang.Study on Real-time Simulation Model of Spray Scrubber[J].Power System Engineering,2006,22(4):4-6.
[19]何祖威,张华伟,展锦程,等.660 MW机组湿法烟气脱硫喷淋塔的简化模型及仿真验证[J].重庆大学学报,2009,32(10):1169-1173.HE Zu-wei,ZHANG Hua-wei,ZHAN Jing-cheng,et al.Simplifying and validating the model of wet flue gas desulphurization spray tower for 660MW units[J].Journal of Chongqing University,2009,32(10):1169-1173.
[20]王永文,冷伟.湿法脱硫塔动态特性仿真建模[J].发电设备,2016,30(5):319-324.Wang Yongwen,Leng Wei.Simulation and Modeling on Dynamic Characteristics of a Wet Desulfurization Tower[J].POWER EQUIPMENT,2016,30(5):319-324.
[21]Norman Kirk Yeh.Liquid Phase Mass Transfer in Spray Contactors[D].Austin:The University of Texas at Austin,2002.
[22]林宗虎.气液两相流和沸腾传热[M].西安:西安交通大学出版社,2003.Lin Zonghu.Gas-liquid two-phase flow and boiling heat transfer[M].Xi'an:Xi'an Jiaotong University Press,2003.
[23]杜谦,吴少华,朱群益,等.湿法烟气脱硫环境下亚硫酸钙的非催化氧化[J].化工学报,2003,54(10):1490-1493.DU Qian,WU Shaohua,ZHU Qunyi,et al.NON-CATALYTIC OXIDATION KINETICS OFCALCIUM SULFITE IN WET LIMESTONE-GYPSUMFGD PROCESS[J].Journal of Chemical Industry and Engineering,2003,54(10):1490-1493.