94-00192-04

94-00192-04
94-00192-04
94-00192-04

　上海市城市排水有限公司M2泵站建于1998年12月，是一个现代化的大型污水输送泵站，主要作用是承担来自南线B号(SB)泵站及浦东中线服务范围内的生活污水、工业废水的输送和防汛时雨水排放的任务，总的输送水量占污水治理二期水量的90%以上。泵站现有运行机组6台(其中，3#、4#为变频调速机组)，总装机容量为8000kVA，排水输送能力为19.16立方米/秒。
　　M2泵站属于污水输送结点站，所处位置对整条干线运行非常重要，六台泵机四台常开，因而对泵机控制系统尤其是PLC的可靠性、防腐蚀能力有较高要求。
　　二、系统组成
　　控制结构
　　M2泵站配备6台泵，每台泵都有独立的控制系统。系统选用了罗克韦尔自动化的CompactLogix L33ER控制器，考虑到防腐和腐蚀环境对电子产品的损害，选择了L33ER的涂层版本，这也是次在泵站级别控制上采用。上级的数据采集和6个泵的协调由一台ControlLogix系统完成。
　(一) 涂层产品应用
　　电子产品的寿命与保存和运行环境密切相关，在美家标准协会的ISA-S71.04-1985标准，欧盟电工协会的IEC 654-4-1987标准中，按照不同种类、不同状态、不同温度下形成的污染做了明确的度量说明和约定了相应数据，为特殊环境下选择使用电子产品选型提供了参考。污染物主要包括液态，固态和气态三大类。特殊气体环境百分比，如图三所示：
罗克韦尔自动化从2000年就开始提供涂层产品，其采用HumiSeal 1B73的丙烯酸树脂三防漆涂层，厚度为1-2mm绝缘，由机器喷涂完成，经过处理后的组件可以地抵抗水分，真菌，灰尘，腐蚀，磨损和其环境应力，符合美标MIL-I-46058C认证和UL94-V0 认证。类似涂层技术在内电子电器工业、汽车工业、航天工业、防工业和生物工程的各种电子线路和元器件已经应用，提供防水、防潮、防湿、防霉(防止焊脚树状生长)、防锈、防污、防化学侵蚀、防碰撞、防零件松脱、防短路的功能，并能够和电磁干扰，提高线路板的绝缘性能，释放因温度周期性变化所造成的压力，提高电子产品的稳定性，延长使用寿命。
　　除了增加标准产品附加涂层的产品线，罗克韦尔自动化在2000年继续拓展苛刻环境下产品，推出了 X T 系列，其采用新技术，同时具备高温(25～7 0 ºC )、防腐蚀(G1-G3)的能力，且作为标准产品提供。目前，罗克韦尔自动化已经可供应苛刻环境下系列产品包括Logix控制系统，PanelView触摸屏，Stratix交换机，1606电源，VersaView工控机，Dynamix振动检测产品，变频器PowerFlex755和软启动SMC-50等产品，也是目前市场上提供涂层、宽温系列、防腐产品比较的厂家。
　　按照内大气情况来看，普通机房的防腐蚀标准就已经达到G1，排水泵站运行中存在的大量水汽、污水散发的硫化氢等有有害气体会对电气产品产生非常强的腐蚀和损害， M2作为干线输送的重要泵站，其稳定运行是每天污水运送的关键，结合白龙港污水二期的良好的应用效果，采用涂层产品是对泵站可靠性指标的重要技术改进。

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