火力发电机组水环式真空泵深度冷却改造试验研究与分析
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摘要
凝汽器抽真空系统的节能改造是近年来电厂技术改造的重要项目。通过加装深度冷却装置降低水环真空泵组工作液温度来提升真空泵组抽吸量为其改造方向之一。以某安装了真空泵工作液深度冷却装置的机组为例,通过现场试验的方法确定了凝汽器真空严密性和真空泵组抽吸量对凝汽器内凝结换热系数的影响。详细计算了水环式真空泵工作液深度冷却改造项目的节能量,为今后凝汽器抽真空系统节能改造提供了重要试验数据支持。
The condenser vacuum-pumping system energy saving renovation is an important project of power plant technical upgrade in recent years. It is one of the retrofit directions to increase the suction quantity by installing a deep cooling device to reduce the working liquid temperature of the water ring vacuum pump group. Taking a unit installing a deep cooling device, for example, the relation of condenser vacuum tightness, water ring vacuum pump suction volume and condensation surface coefficient of condenser is studied by experimental method. In addition, the energy saving of water ring vacuum pump with deep cooling retrofit is calculated detailly in the paper, in order to provide important experimental data support for energy saving technical retrofit of condenser vacuum system in the future.
The condenser vacuum-pumping system energy saving renovation is an important project of power plant technical upgrade in recent years. It is one of the retrofit directions to increase the suction quantity by installing a deep cooling device to reduce the working liquid temperature of the water ring vacuum pump group. Taking a unit installing a deep cooling device, for example, the relation of condenser vacuum tightness, water ring vacuum pump suction volume and condensation surface coefficient of condenser is studied by experimental method. In addition, the energy saving of water ring vacuum pump with deep cooling retrofit is calculated detailly in the paper, in order to provide important experimental data support for energy saving technical retrofit of condenser vacuum system in the future.
引文
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[5] 杨文娟,孙奉仲,等.300MW机组凝汽器汽侧换热性能的三维数值模拟与分析[J] .动力工程,2005 ,25 (2):174-178.
[6] 陈晓珊,张卫会.考虑空气量影响时蒸汽凝结放热系数的计算方法分析[J].汽轮机技术,2002,44(6):333-335.
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[8] 朱恂,李刚,等.水平三维肋管外含不凝性气体的水蒸气凝结换热的实验研究[J].动力工程,2006,26(5):694-698.
[2] 韩中合,吕宏.凝汽器换热系数计算及空气含量和污垢厚度对真空的影响分析[J].华北电力大学学报,2009,36(1):59-63.
[3] 王运民.定量分析凝汽器冷却水管结垢对机组经济性的影响[J] .汽轮机技术,2005,47(2):105-107.
[4] 江宁,曹祖庆.用标准传热系数评价凝汽器水侧、汽侧清洁程度[ J] .热力发电,2001,(2):43-45.
[5] 杨文娟,孙奉仲,等.300MW机组凝汽器汽侧换热性能的三维数值模拟与分析[J] .动力工程,2005 ,25 (2):174-178.
[6] 陈晓珊,张卫会.考虑空气量影响时蒸汽凝结放热系数的计算方法分析[J].汽轮机技术,2002,44(6):333-335.
[7] 种道彤,刘继平.漏空气对凝汽器传热性能影响的实验研究[J] .中国电机工程学报,2005,25(4):152-157.
[8] 朱恂,李刚,等.水平三维肋管外含不凝性气体的水蒸气凝结换热的实验研究[J].动力工程,2006,26(5):694-698.