330 MW机组脱硫废水旁路烟道喷雾干燥技术数值模拟与应用示范
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摘要
以某330MW燃煤机组旁路烟道安装的脱硫废水喷雾干燥塔为研究对象,使用ANSYS ICEM、Fluent软件对干燥塔内传热传质过程进行数值模拟,并对应用示范结果进行了分析。结果表明:不同工况下,喷雾干燥塔内温度场、流场分布良好,气、液传热传质主要集中在塔轴心;干燥后,脱硫废水中的Cl~–转移到固体产物中,处理难度降低;脱硫废水在高温烟气中蒸发,减弱了高比电阻粉尘反电晕,促进了颗粒物聚集长大并被静电除尘器捕集。采用旁路烟气干燥技术实现脱硫废水零排放,运行效果良好。
Taking the desulphurization wastewater spray drying tower installed in bypass flue of a 330 MW coal-fired power plant as the research object, the ANSYS ICEM and Fluent software were used to simulate the heat and mass transfer process in the drying tower. Moreover, the application demonstration results were analyzed. The results show that, under different working conditions, the temperature field and flow field in the spray drying tower are well distributed. The gas-liquid heat and mass transfer mainly concentrates in the tower's axial direction. The Cl~– in the desulfurization wastewater migrated into the solid products, which decreased the treatment difficulty. The desulfurization wastewater evaporated in the high-temperature flue gas, which reduced the high specific resistance dust anti-corona and promoted the accumulation of particulate matters, thus the large size particles can be captured easily by the electrostatic precipitator. The bypass flue gas drying technology has good operation effect for realizing zero discharge of the desulfurization wastewater.
Taking the desulphurization wastewater spray drying tower installed in bypass flue of a 330 MW coal-fired power plant as the research object, the ANSYS ICEM and Fluent software were used to simulate the heat and mass transfer process in the drying tower. Moreover, the application demonstration results were analyzed. The results show that, under different working conditions, the temperature field and flow field in the spray drying tower are well distributed. The gas-liquid heat and mass transfer mainly concentrates in the tower's axial direction. The Cl~– in the desulfurization wastewater migrated into the solid products, which decreased the treatment difficulty. The desulfurization wastewater evaporated in the high-temperature flue gas, which reduced the high specific resistance dust anti-corona and promoted the accumulation of particulate matters, thus the large size particles can be captured easily by the electrostatic precipitator. The bypass flue gas drying technology has good operation effect for realizing zero discharge of the desulfurization wastewater.
引文
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[11]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 Zijing,WANG Jianwen,GAO Yi,et al.Flow field simulation of smoke and gas evaporation characterristics of desulfurization wastewater in coal-fired power plant[J].Journal of China Coal Society,2015,40(3):678-683.
[12]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 Shuangwei,CHAI Feng,WU Wenlong,et al.The numerical simulation of flue gas desulphurization wastewater spray evaporation[J].Journal of Computer and Applied Chemistry,2016,33(1):47-53.
[13]RANZ W E.Evaporation from drops[J].Chemical Engineering Progress,1952,48:141-146.
[14]KUO K K.Principles of combustion[M].New Jersey&Sons,2005
[15]戚严文,许京荆,孙裕萍,等.催化剂喷雾干燥过程气固两相流数值模拟[J].工业控制计算机,2018,31(5):76-78.QI Yanwen,XU Jingjing,SUN Yuping,et al.Numerical simulation of gas-particle flow in catalyst spray drying process[J].Industrial Control Computer,2018,31(5):76-78.
[16]GOGOS G,SOH S,POPE D N.Effects of gravity and ambient pressure on liquid fuel droplet evaporation[J].International Journal of Heat&Mass Transfer,2003,46(2):283-296.
[17]LEE G Y,KIM S Y,YOON W S.Oscillatory vaporization and acoustic response of droplet at high pressure[J].International Communications in Heat&Mass Transfer,2008,35(10):1302-1306.
[18]胡斌,刘勇,杨春敏,等.脱硫废水蒸发脱PM2.5试验研究[J].高校化学工程学报,2016,30(4):953-960.HU Bin,LIU Yong,YANG Chunmin,et al.Experimental study on PM2.5 removal with evaporation of desulfurized wastewater[J].Journal of Chemical Engineering of Chinese Universities,2016,30(4):953-960.
[2]吴怡卫.石灰石-石膏湿法烟气脱硫废水处理的研究[J].中国电力,2006,39(4):75-78.WU Yiwei.Study on the wastewater treatment in limestone-gypsum wet FGD process[J].Electric Power,2006,39(4):75-78.
[3]汤争光,梅拥军.石灰石-石膏湿法烟气脱硫废水处理浅析[J].上海环境科学,2001(12):609-610.TANG Zhengguang,MEI Yongjun.Preliminary analysis on treatment of wastewater from limestone-gypsum wet flue gas desulfurization process[J].Shanghai Environmental Sciences,2001(12):609-610.
[4]ENOCH G D,SPIERING W,TIGCHELAAR P,et al.Treatment of waste water from wet lime(stone)flue gas desulfurization plants with aid of crossflow microfiltration[J].Separation Science,1990,25(13/14/15):1587-1605.
[5]ENOCH G D,BROEKE W F V D,SPIERING W.Removal of heavy metals and suspended solids from wastewater from wet lime(stone)-gypsum flue gas desulphurization plants by means of hydrophobic and hydrophilic crossflow microfiltration membranes[J].Journal of Membrane Science,1994,87(1/2):191-198.
[6]刘绍银.火电厂湿法烟气脱硫废水处理若干问题的探讨[J].热力发电,2008,37(11):121-122.LIU Shaoyin.An Approach to several problems in treatment of waste water from wet flue gas desulphurization system in thermal power plants[J].Thermal Power Generation,2008,37(11):121-122.
[7]HIGGINS T E,THOMAS S A,GIVENS S W.Flue gas desulfurization wastewater treatment primer[J].Power,2009,153(3):40-43.
[8]UKAI N,NAGAYASU T,KAMIYAMA N,et al.Spray-drying device for dehydrated filtrate from desulfurization wastewater,air pollution control system and flue gas treatment method:20130248121[P].2013-09-26.
[9]LIANG Z,ZHANG L,YANG Z,et al.Evaporation and crystallization of a droplet of desulfurization wastewater from a coal-fired power plant[J].Applied Thermal Engineering,2017,119:52-62.
[10]DENG J J,PAN L M,CHEN D Q,et al.Numerical simulation and field test study of desulfurization wastewater evaporation treatment through flue gas[J].Water Science and Technology,2014,70(7):1285-1291.
[11]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 Zijing,WANG Jianwen,GAO Yi,et al.Flow field simulation of smoke and gas evaporation characterristics of desulfurization wastewater in coal-fired power plant[J].Journal of China Coal Society,2015,40(3):678-683.
[12]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 Shuangwei,CHAI Feng,WU Wenlong,et al.The numerical simulation of flue gas desulphurization wastewater spray evaporation[J].Journal of Computer and Applied Chemistry,2016,33(1):47-53.
[13]RANZ W E.Evaporation from drops[J].Chemical Engineering Progress,1952,48:141-146.
[14]KUO K K.Principles of combustion[M].New Jersey&Sons,2005
[15]戚严文,许京荆,孙裕萍,等.催化剂喷雾干燥过程气固两相流数值模拟[J].工业控制计算机,2018,31(5):76-78.QI Yanwen,XU Jingjing,SUN Yuping,et al.Numerical simulation of gas-particle flow in catalyst spray drying process[J].Industrial Control Computer,2018,31(5):76-78.
[16]GOGOS G,SOH S,POPE D N.Effects of gravity and ambient pressure on liquid fuel droplet evaporation[J].International Journal of Heat&Mass Transfer,2003,46(2):283-296.
[17]LEE G Y,KIM S Y,YOON W S.Oscillatory vaporization and acoustic response of droplet at high pressure[J].International Communications in Heat&Mass Transfer,2008,35(10):1302-1306.
[18]胡斌,刘勇,杨春敏,等.脱硫废水蒸发脱PM2.5试验研究[J].高校化学工程学报,2016,30(4):953-960.HU Bin,LIU Yong,YANG Chunmin,et al.Experimental study on PM2.5 removal with evaporation of desulfurized wastewater[J].Journal of Chemical Engineering of Chinese Universities,2016,30(4):953-960.
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