石灰石–石膏湿法脱硫吸收塔结垢分析及预防措施
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摘要
结垢是影响石灰石-石膏湿法脱硫(wetfluegas desulfurization,WFGD)系统安全稳定运行的主要问题之一。某发电公司330 MW机组烟气脱硫一级塔及除雾器结垢情况严重,已影响脱硫系统的正常运行。针对该问题,对吸收塔及脱硫系统运行参数进行了系统分析,发现脉冲悬浮系统故障、除雾器喷嘴堵塞、浆液参数波动是造成吸收塔结垢的主要原因。通过加强对除雾器的冲洗、密切监视对比除雾器和浆液脉冲泵启动初期及正常运行中的参数、合理控制脱硫一级塔浆液密度、pH值、氧化风量及氟离子浓度等,吸收塔结垢问题已得到有效缓解。
Scaling is one of the main problems affecting the safe and stable operation of limestone gypsum wet flue gas desulfurization(WFGD) system. In a power plant, the scaling of the primary tower and the mist eliminator of 330 MW unit was serious, which had affected the normal operation of the flue gas desulfurization system. For this problem, the paper systematically analyzed the absorber and the operation parameters of the desulfurization system. It was found that the fault of the pulse suspension system, the blockage of the mist eliminator nozzle and the fluctuation of the slurry parameters were the main causes of the scaling in the absorber. By strengthening the flushing of the mist eliminator, monitoring and comparing the parameters of the mist eliminator and the slurry pulse pump at the beginning and normal operation, reasonably controlling the slurry density, pH value, oxidation air volume and fluoride ion concentration, the scaling of the primary tower had been effectively alleviated.
Scaling is one of the main problems affecting the safe and stable operation of limestone gypsum wet flue gas desulfurization(WFGD) system. In a power plant, the scaling of the primary tower and the mist eliminator of 330 MW unit was serious, which had affected the normal operation of the flue gas desulfurization system. For this problem, the paper systematically analyzed the absorber and the operation parameters of the desulfurization system. It was found that the fault of the pulse suspension system, the blockage of the mist eliminator nozzle and the fluctuation of the slurry parameters were the main causes of the scaling in the absorber. By strengthening the flushing of the mist eliminator, monitoring and comparing the parameters of the mist eliminator and the slurry pulse pump at the beginning and normal operation, reasonably controlling the slurry density, pH value, oxidation air volume and fluoride ion concentration, the scaling of the primary tower had been effectively alleviated.
引文
[1]刘绍银.湿法脱硫系统结垢的化学机理及运行控制分析[J].热力发电,2011,40(1):70-72.
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[4]董丽彦,杨贝,马帅,等.湿法脱硫除雾器减缓结垢的方法研究[J].现代化工,2017,37(1):168-170.
[5]党龙,张晓玲,王智,等.湿法脱硫系统除雾器结垢分析及预防措施[J].发电与空调,2017,33(1):30-34.
[6]郭静东,廖冬梅,颜海伟.燃煤电厂脱硫石膏品质影响因素及改进措施[J].发电与空调,2017,38(6):10-13.
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[8]天津大学无机化学教研室.无机化学[M].北京:高等教育出版社,2002:506-507.
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[10]禾志强,祁利明,马青树.石灰石-石膏法脱硫系统除雾器堵塞研究[J].锅炉技术,2010,41(1):77-80.
[11]陈益飞.FGD系统除雾器结垢冲洗及影响因素分析[J].江苏电机工程,2010,29(4):77-79.
[12]马磊,沈汉年,赵立冬.石灰石/石灰湿法烟气脱硫结垢的机理及控制[J].工业安全与环保,2007,33(9):19-20.
[13]肖辰畅,罗岳平,李彩亭.己二酸在湿法石灰石烟气脱硫系统中阻垢性能的研究[J].环境科学与管理,2012,37(11):127-185.
[14]郭瑞堂,高翔,王军,等.湿法烟气脱硫石灰石的活性[J].燃烧科学与技术,2007,13(6):485-490.
[15]钟秦.石灰石湿法烟气脱硫中氟铝络合物的影响[J].南京理工大学学报,2001,25(1):75-78.
[2]杜谦,吴少华,朱群益,等.石灰石/石灰湿法烟气脱硫系统的结垢问题[J].电站系统工程,2004,20(5):41-44.
[3]杨杨,樊保国.石灰石湿法脱硫吸收塔内结垢研究[J].锅炉技术,2013,44(5):71-74.
[4]董丽彦,杨贝,马帅,等.湿法脱硫除雾器减缓结垢的方法研究[J].现代化工,2017,37(1):168-170.
[5]党龙,张晓玲,王智,等.湿法脱硫系统除雾器结垢分析及预防措施[J].发电与空调,2017,33(1):30-34.
[6]郭静东,廖冬梅,颜海伟.燃煤电厂脱硫石膏品质影响因素及改进措施[J].发电与空调,2017,38(6):10-13.
[7]王辉新,毛树花.烟气脱硫系统吸收塔塔壁结晶问题分析及控制[J].河北电力技术,2007,26(5):51-52.
[8]天津大学无机化学教研室.无机化学[M].北京:高等教育出版社,2002:506-507.
[9]DeanJA.Lange’shandbookofchemistry[M].New York:McGraw Hill,2005:1331-1342.
[10]禾志强,祁利明,马青树.石灰石-石膏法脱硫系统除雾器堵塞研究[J].锅炉技术,2010,41(1):77-80.
[11]陈益飞.FGD系统除雾器结垢冲洗及影响因素分析[J].江苏电机工程,2010,29(4):77-79.
[12]马磊,沈汉年,赵立冬.石灰石/石灰湿法烟气脱硫结垢的机理及控制[J].工业安全与环保,2007,33(9):19-20.
[13]肖辰畅,罗岳平,李彩亭.己二酸在湿法石灰石烟气脱硫系统中阻垢性能的研究[J].环境科学与管理,2012,37(11):127-185.
[14]郭瑞堂,高翔,王军,等.湿法烟气脱硫石灰石的活性[J].燃烧科学与技术,2007,13(6):485-490.
[15]钟秦.石灰石湿法烟气脱硫中氟铝络合物的影响[J].南京理工大学学报,2001,25(1):75-78.