脱硫废水高效气化途径的研究
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摘要
为实现脱硫废水的高效气化,采用实验与模拟相结合的方法,建立了烟道内离散液滴运动和气液两相传热传质模型,并通过脱硫废水蒸发实验验证了该模型的有效性,最终获得脱硫废水高效气化途径。结果表明:脱硫废水完全气化长度随烟速的增加先减小后增大,即存在最佳烟速可使得液滴完全气化长度最小,通过调节烟速达到最佳值可实现脱硫废水的高效气化;烟温越高最佳烟速越小,喷液量越大最佳烟速越大。在研究的参数范围内,获得最佳烟速分别与烟温和喷液量之间的定量关系式。
In order to achieve efficient evaporation of desulfurization waste water,the models of liquid droplet movement and gas-liquid two-phase heat and mass transfer in a flue are established,and the effectiveness of the model is verified by an evaporation experiment of desulfurization waste water. In this paper,the efficient evaporation of desulfurization waste water was investigated using simulation along with experiment. It has been found that the complete vaporization length of desulfurization waste water decreases first and then increases with the increase of flue gas velocity. There is an optimum flue gas velocity that leads to the minimum complete vaporization length,and the high efficient evaporation of desulfurization waste water can be achieved by adjusting the flue gas velocity to the optimum value. In addition,the higher the flue gas temperature is,the smaller the optimum flue gas velocity is,and the stronger the waste water flow is,the higher the optimum flue gas velocity is. In the range of parameters studied in this paper,the quantitative relationships of the optimum flue gas velocity with the flue gas temperature and waste water flow are obtained.
In order to achieve efficient evaporation of desulfurization waste water,the models of liquid droplet movement and gas-liquid two-phase heat and mass transfer in a flue are established,and the effectiveness of the model is verified by an evaporation experiment of desulfurization waste water. In this paper,the efficient evaporation of desulfurization waste water was investigated using simulation along with experiment. It has been found that the complete vaporization length of desulfurization waste water decreases first and then increases with the increase of flue gas velocity. There is an optimum flue gas velocity that leads to the minimum complete vaporization length,and the high efficient evaporation of desulfurization waste water can be achieved by adjusting the flue gas velocity to the optimum value. In addition,the higher the flue gas temperature is,the smaller the optimum flue gas velocity is,and the stronger the waste water flow is,the higher the optimum flue gas velocity is. In the range of parameters studied in this paper,the quantitative relationships of the optimum flue gas velocity with the flue gas temperature and waste water flow are obtained.
引文
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[15]SAZHIN S S,KRISTYADI T,ABDELGHAFFAR W A,et al.Models for fuel droplet heating and evaporation:comparative analysis[J].Fuel,2006,85(12/13):1613-1630.
[2]周卫青,李进.火电厂石灰石湿法烟气脱硫废水处理方法[J].电力科技与环保,2006,22(1):29-31.ZHOU Wei-qing,LI Jin.Methods to treat waste water from limestone wet flue gas desulfurization in power plant[J].Electric Power Technology and Environmental Protection,2006,22(1):29-31.
[3]刘海洋,夏怀祥,江澄宇,等.燃煤电厂湿法脱硫废水处理技术研究进展[J].环境工程,2016,34(1):31-35.LIU Hai-yang,XIA Huai-xiang,JIANG Cheng-yu,et al.Research advances in wet flue gas desulfurization wastewater treatment technology in coal-fired power plant[J].Environment Engineering,2016,34(1):31-35.
[4]李明波,范玺,孙克勤.利用烟道气处理火电厂WFGD废水的技术应用[J].电力科技与环保,2010,26(2):53-55.LI Ming-bo,FAN Xi,SUN Ke-qin.Technique application of WFGDwastewater treatment using flue gas in power plant[J].Electric Power Technology and Environmental Protection,2010,26(2):53-55.
[5]MA S,CHAI J,CHEN G,et al.Research on desulfurization wastewater evaporation:Present and future perspectives[J].Renewable&Sustainable Energy Reviews,2016,58:1143-1151.
[6]张志荣,冉景煜.废水液滴在低温烟气中的蒸发特性数值研究[J].环境工程学报,2011,5(9):2048-2053.ZHANG Zhi-rong,RAN Jing-yu.Numerical study on evaporation characteristics of waste water droplet in low temperature flue gas[J].Chinese Journal of Environment Engineering,2011,5(9):2048-2053.
[7]张子敬,汪建文,高艺,等.燃煤电厂脱硫废水烟气蒸发特性流场模拟[J].煤炭学报,2015,40(3):678-683.ZHANG Zi-jing,WANG Jian-wen,GAO Yi,et al.Flow field simulation of smoke and gas evaporation characteristics of desulfurization wastewater in coal-fired power plant[J].Journal of China Coal Society,2015,40(3):678-683.
[8]吴帅帅,李红智,陈鸿伟,等.脱硫废水烟道喷雾蒸发过程的数值模拟[J].热力发电,2015,44(12):31-36.WU Shuai-shuai,LI Hong-zhi,CHEN Hong-wei,et al.Numerical study on spray evaporation process of desulfurization wastewater in flue duct[J].Thermal Power Generation,2015,44(12):31-36.
[9]马双忱,柴峰,吴文龙,等.脱硫废水烟道蒸发工艺影响因素实验研究[J].环境科学与技术,2015,38(12):297-301.MA Shuang-chen,CHAI Feng,WU Wen-long,et al.Experimental research on influencing factors of flue evaporation treatment for desulfurization wastewater[J].Environment Science&Technology,2015,38(12):297-301.
[10]马双忱,柴峰,吴文龙,等.脱硫废水烟道喷雾蒸发的数值模拟[J].计算机与应用化学,2016,33(1):47-53.MA Shuang-chen,CHAI Feng,WU Wen-long,et al.The numerical simulation of flue gas desulphurization wastewater spray evaporation[J].Computers and Applied Chemistry,2016,33(1):47-53.
[11]宋卓林,单彦广,许恋斯.前驱体液滴在射频感应等离子体中的蒸发和传热传质[J].热能动力工程,2016,31(1):37-41.SONG Zhuo-lin,SHAN Yan-guang,XU Lian-si.Evaporation,heat and mass transfer of the pre-cursor liquid drops in the radio frequency-induced plasma[J].Journal of Engineering for Thermal Energy and Power,2016,31(1):37-41.
[12]冉景煜,张志荣.不同物性液滴在低温烟气中的蒸发特性数值研究[J].中国电机工程学报,2010,30(26):62-68.RAN Jing-yu,ZHANG Zhi-rong.Numerical study on evaporation characteristics of different substance droplet in low temperature flue gas[J].Proceedings of the CSEE,2010,30(26):62-68.
[13]Hill F F,Zank J.Flue gas desulphurization by spray dry absorption[J].Chemical Engineering and Processing,2000,39(1):45-52.
[14]袁竹林.气固两相流动与数值模拟[M].江苏:东南大学出版社,2013.YUAN Zhu-lin.Gas solid two phase flow and numerical simulation[M].Jiangsui:Southeast University Press,2013.
[15]SAZHIN S S,KRISTYADI T,ABDELGHAFFAR W A,et al.Models for fuel droplet heating and evaporation:comparative analysis[J].Fuel,2006,85(12/13):1613-1630.