冷凝超细雾滴除雾器优化设计与数值模拟
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摘要
烟气脱水技术需要将冷凝超细雾滴进行有效分离,针对普通除雾器效率低、勾板除雾器阻力大的问题,且为提高除雾器对冷凝超细雾滴的综合性能,设计了一种百叶窗除雾器,并利用数值模拟方法对三种除雾器性能进行了对比分析。普通除雾器难以将粒径小于15μm的雾滴脱除;勾板除雾器能够较大程度改善细雾滴的除雾效率,但对于5μm以下的超细雾滴的脱除率仍然很低,且系统阻力较大;百叶窗除雾器具有接近于勾板除雾器的除雾效率,尤其是对超细雾滴有更优越的脱除效率,且在低风速下的表现也更加突出。百叶窗除雾器的系统阻力介于普通除雾器和勾板除雾器之间,因此具有优越的综合性能,对于烟气脱水技术的实施具有重要的现实意义。
Highly effective separation of tiny droplet was an essential part of fume dehydration. In order to obtain both higher demist efficiency and less system resistance, a novel mist eliminator with shutter was designed. Numerical simulation were carried out on the three mist eliminators. The results of numerical simulation suggested that the conventional eliminator could not eliminate droplet with 15 μm. Accompanied by system resistance rising, eliminator with hamulus could highly increase demist efficiency, but it could not eliminate 5 μm tiny droplet too. Adopting eliminator with shutter could be very good to deal with the bad performance of tiny droplet demisting, especially in low fume velocity, which could highly increase demist efficiency with less extra resistance. Through numerical simulation study, the basis of design and optimization of mist eliminator for wet flue gas dehydration were provided.
Highly effective separation of tiny droplet was an essential part of fume dehydration. In order to obtain both higher demist efficiency and less system resistance, a novel mist eliminator with shutter was designed. Numerical simulation were carried out on the three mist eliminators. The results of numerical simulation suggested that the conventional eliminator could not eliminate droplet with 15 μm. Accompanied by system resistance rising, eliminator with hamulus could highly increase demist efficiency, but it could not eliminate 5 μm tiny droplet too. Adopting eliminator with shutter could be very good to deal with the bad performance of tiny droplet demisting, especially in low fume velocity, which could highly increase demist efficiency with less extra resistance. Through numerical simulation study, the basis of design and optimization of mist eliminator for wet flue gas dehydration were provided.
引文
[1] 车德竞,孟洁,陈永辉,等.未来20年我国大力发电用水情况预测分析[J].电力建设,2013,34(8):17-21.
[2] 刘永久.火电厂烟囱内烟气温降及饱和烟气的凝结水量计算[J].热力发电,2008,37(2):72-73.
[3] 陈牧.湿法脱硫后烟囱出口烟气液滴夹带问题分析及解决[J].电力建设,2010,31(10):80-83.
[4] LEVY E, BILIRGEN H, JEONG K. Recovery of water from boiler flue gas[R]. Bethlehem: DOE, 2008.
[5] 丛晓蓉,汪洋.燃煤电站锅炉烟气余热与水分联合回收技术展望与分析[J].发电与空调,2012,33(2):26-28.
[6] FOLKEDAHL B C, WEBER G F, COLLINGS M E. Water extraction from coal-fired power plant flue gas[R]. United States: University of North Dakota, 2006.
[7] 赵相相,张燕,丁云飞,等.除湿溶液表面蒸汽压的实验研究[J].暖通空调,2007,37(4):15-18.
[8] WANG Ting-ting, YUE Mao-wen, QI Hong, et al. Transport membrane condenser for water and heat recovery from gaseous streams: performance evaluation[J]. Journal of Membrane Science, 2015, 484:10-17.
[9] MACEDONIO F, CERSOSIMO M, BRUNETTI A, et al. Water recovery from humidified waste gas streams: quality control using membrane condenser technology[J]. Chemical Engineering and Processing: Process Intensification, 2014, 86:196-203.
[10] 熊英莹,谭厚章,许伟刚,等.火电厂烟气潜热和凝结水回收的试验研究[J].热力发电,2015,44(6):77-81.
[11] 姚杰,仲兆平,周山明.湿法烟气脱硫带钩波纹板除雾器结构优化数值模拟[J].中国电机工程学报,2010,30(14):61-67.
[12] 谢乾.脱硫除雾器除雾性能研究[D].北京:华北电力大学,2009.
[13] MCNULTY J K, MONAT J P, HANSEN O V. Performance of commercial chevron mist eliminators[J]. Chemical Engineering Progress, 1987:48-55.
[14] RAHIMI R, ABBASPOUR D. Determination of pressure drop in wire mesh mist eliminator by cfd[J]. Chemical Engineering & Processing Process Intensification, 2008,47(9-10):1504-1508.
[15] 徐淑君,姚征,朱懿渊.波纹板除雾器两相流动的数值模拟与分析[J].上海理工大学学报,2007,29(3):275-280.
[16] 王霄,闵健,高正明,等.脱硫吸收塔除雾器性能的实验研究和数值模拟[J].环境工程学报,2008,2(11):1529-1534.
[17] 赵晨光.带液滴辅助捕集结构的折板除雾器性能数值模拟及优化[D].天津:天津大学,2015.
[18] 洪文鹏,张博,查博宇,等.加装双钩片对除雾器流场及除雾性能的影响[J].热力发电,2017,46(5):115-121.
[19] 石振晶,陶明,何育东,等.喷淋脱硫塔内除雾器性能数值模拟[J].热力发电,2016,45(3):92-97,104.
[20] 杨玮,曲江源,齐娜娜,等.湿法烟气脱硫塔内折形板除雾器优化的数值模拟[J].电力科学与工程,2017,33(7):43-51.
[21] 陈凯华,宋存义,李强,等.湿法烟气脱硫系统中折板式除雾器性能的数值模拟[J].环境工程学报,2007,1(7):91-96.
[22] 孙志春,肖海平,孙保民,等.台山电厂水平布置除雾器性能优化的试验研究[J].动力工程学报,2010,30(11):889-894.
[23] 刘丽艳,赵晨光.新型折板除雾器的流场和压降数值模拟[J].化学工业与工程,2017,34(2):79-83.
[24] 孙志春,郭永红,肖海平,等.鼓泡脱硫塔除雾器除雾特性数值研究及实验验证[J].中国电机工程学报,2010,30(8):68-75.
[25] 王政允.湿法脱硫系统除雾器除雾特性的实验研究与数值模拟[D].北京:华北电力大学,2009.
[26] 黄新长.脱硫除雾器性能实验研究与优化设计[D].北京:华北电力大学,2009.
[27] 赵毅,华伟,王亚君,等.湿式烟气脱硫塔中折线型挡板除雾器分离效率的数值模拟[J].动力工程,2005,25(2):293-297.
[28] 郝雅洁.湿法烟气脱硫除雾效率和流场优化的数值模拟研究[D].南京:东南大学,2015.
[29] GALLETTI C, BRUNAZZI E, TOGNOTTI L. A numerical model for gas flow and droplet motion in wave-plate mist eliminators with drainage channels[J]. Chemical Engineering Science,2008,63(23):5639-5652.
[30] 夏芃力,孔庆森,刘丽艳.折流板除雾器结构尺寸优化数值模拟[J].化工机械,2014,41(3):350-356.
[31] 周志军,林震,周俊虎,等.不同湍流模型在管道流动阻力计算中的应用和比较[J].热力发电,2007,36(1):18-23.
[2] 刘永久.火电厂烟囱内烟气温降及饱和烟气的凝结水量计算[J].热力发电,2008,37(2):72-73.
[3] 陈牧.湿法脱硫后烟囱出口烟气液滴夹带问题分析及解决[J].电力建设,2010,31(10):80-83.
[4] LEVY E, BILIRGEN H, JEONG K. Recovery of water from boiler flue gas[R]. Bethlehem: DOE, 2008.
[5] 丛晓蓉,汪洋.燃煤电站锅炉烟气余热与水分联合回收技术展望与分析[J].发电与空调,2012,33(2):26-28.
[6] FOLKEDAHL B C, WEBER G F, COLLINGS M E. Water extraction from coal-fired power plant flue gas[R]. United States: University of North Dakota, 2006.
[7] 赵相相,张燕,丁云飞,等.除湿溶液表面蒸汽压的实验研究[J].暖通空调,2007,37(4):15-18.
[8] WANG Ting-ting, YUE Mao-wen, QI Hong, et al. Transport membrane condenser for water and heat recovery from gaseous streams: performance evaluation[J]. Journal of Membrane Science, 2015, 484:10-17.
[9] MACEDONIO F, CERSOSIMO M, BRUNETTI A, et al. Water recovery from humidified waste gas streams: quality control using membrane condenser technology[J]. Chemical Engineering and Processing: Process Intensification, 2014, 86:196-203.
[10] 熊英莹,谭厚章,许伟刚,等.火电厂烟气潜热和凝结水回收的试验研究[J].热力发电,2015,44(6):77-81.
[11] 姚杰,仲兆平,周山明.湿法烟气脱硫带钩波纹板除雾器结构优化数值模拟[J].中国电机工程学报,2010,30(14):61-67.
[12] 谢乾.脱硫除雾器除雾性能研究[D].北京:华北电力大学,2009.
[13] MCNULTY J K, MONAT J P, HANSEN O V. Performance of commercial chevron mist eliminators[J]. Chemical Engineering Progress, 1987:48-55.
[14] RAHIMI R, ABBASPOUR D. Determination of pressure drop in wire mesh mist eliminator by cfd[J]. Chemical Engineering & Processing Process Intensification, 2008,47(9-10):1504-1508.
[15] 徐淑君,姚征,朱懿渊.波纹板除雾器两相流动的数值模拟与分析[J].上海理工大学学报,2007,29(3):275-280.
[16] 王霄,闵健,高正明,等.脱硫吸收塔除雾器性能的实验研究和数值模拟[J].环境工程学报,2008,2(11):1529-1534.
[17] 赵晨光.带液滴辅助捕集结构的折板除雾器性能数值模拟及优化[D].天津:天津大学,2015.
[18] 洪文鹏,张博,查博宇,等.加装双钩片对除雾器流场及除雾性能的影响[J].热力发电,2017,46(5):115-121.
[19] 石振晶,陶明,何育东,等.喷淋脱硫塔内除雾器性能数值模拟[J].热力发电,2016,45(3):92-97,104.
[20] 杨玮,曲江源,齐娜娜,等.湿法烟气脱硫塔内折形板除雾器优化的数值模拟[J].电力科学与工程,2017,33(7):43-51.
[21] 陈凯华,宋存义,李强,等.湿法烟气脱硫系统中折板式除雾器性能的数值模拟[J].环境工程学报,2007,1(7):91-96.
[22] 孙志春,肖海平,孙保民,等.台山电厂水平布置除雾器性能优化的试验研究[J].动力工程学报,2010,30(11):889-894.
[23] 刘丽艳,赵晨光.新型折板除雾器的流场和压降数值模拟[J].化学工业与工程,2017,34(2):79-83.
[24] 孙志春,郭永红,肖海平,等.鼓泡脱硫塔除雾器除雾特性数值研究及实验验证[J].中国电机工程学报,2010,30(8):68-75.
[25] 王政允.湿法脱硫系统除雾器除雾特性的实验研究与数值模拟[D].北京:华北电力大学,2009.
[26] 黄新长.脱硫除雾器性能实验研究与优化设计[D].北京:华北电力大学,2009.
[27] 赵毅,华伟,王亚君,等.湿式烟气脱硫塔中折线型挡板除雾器分离效率的数值模拟[J].动力工程,2005,25(2):293-297.
[28] 郝雅洁.湿法烟气脱硫除雾效率和流场优化的数值模拟研究[D].南京:东南大学,2015.
[29] GALLETTI C, BRUNAZZI E, TOGNOTTI L. A numerical model for gas flow and droplet motion in wave-plate mist eliminators with drainage channels[J]. Chemical Engineering Science,2008,63(23):5639-5652.
[30] 夏芃力,孔庆森,刘丽艳.折流板除雾器结构尺寸优化数值模拟[J].化工机械,2014,41(3):350-356.
[31] 周志军,林震,周俊虎,等.不同湍流模型在管道流动阻力计算中的应用和比较[J].热力发电,2007,36(1):18-23.