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加拿大多伦多皮尔森国际机场以及加拿大东部和美国八个州共计百万人口，遭遇了严重的停电。这场灾难性事故警示我 们，机场需要独立可靠的供电系统。该系统不仅要绝对保证全天候的可靠性，其经济性也是需要仔细考虑的。
热电厂的设计采用一对GE LM6000PD航改气轮机，每台可输出42MW，满足了可靠性和成本的要求。涡轮机产生的气体通过蒸汽 发动机使第三个蒸汽驱动发动机运行，输出33MW。电厂剩余的热量用于航站楼的制热/制冷。该设计十分注重经济效益，产生的 多余电力可以出售给安大略湖电网。在详细评估各供应商的系统可靠性后，最终选择了横河电机CENTUM CS 3000控制系统。
“包括Cogen电厂在内，我们对横河电机控制系统的可靠性非常满意。”大多伦多机场管理局(以下简称GTAA)*1公共事业部高级 经理Henry Oberhauser先生说道。“这个可靠系统发生的唯一一次运行中断是由于分承包商提供的次标准的工艺用水引起的。我 们切实感受到了横河电机的‘7个9’的可靠性，即40年停车时间少于一分钟。”
*1 GTAA负责皮尔森机场的运营，在三个航站楼中，共有65家航空公司、82个登机口。第四航站楼正在设计中。机场年收入为140亿美元，其中 税收收入28亿美元，同时提供135,000个工作岗位。它还拥有16,000个停车位。 *2 SNC-Lavalin是全球工程和建筑集团公司的行业龙头，已经在加拿大及另外三十个国家设立了办事处。其业务覆盖超过100个国家。
电厂简介
该机场隶属于GTAA，外部公司受雇负责电厂设计、建造以及运行。为了满足对电力和热能的同步需求，同时获得燃料(天然气)， 热电联产系统是机场的最佳选择。2001年初，GTAA曾为机场建立了一个中心公用电厂;随着机场中各种设备的不断增加，它逐 步取代了原有电厂。该电厂不仅为机场提供蒸汽取暖，还提供冷却水为机场终端设备降温。此次建立的新电厂可以提供所需要的 蒸汽，在使用热电联产系统产生的蒸汽时，还允许在备用模式下对电厂的蒸汽锅炉进行可选操作。该电厂于2003年建成。一年之 后，横河电机控制系统投入运行。 设计上一个有趣之处是采用了两台“直流蒸汽发生器”OTSG，应用了安大略省剑桥的创新蒸汽技术(IST)。与传统设计相比，这 些机组具有以下一些优点。它们不仅高效灵活，还可在三十分钟之内实现从冷启动到完全运行。它们启动，运行并完成干燥。无 需通过排气管、分流阀系统和排气管消声器。从根本上说，直流蒸汽发生器(OTSG)是热交换器，由一系列管道组成，其中的锅炉 水同时被加热、蒸发和过热。OTSG中回收的热为蒸汽涡轮机提供所需的温度和压力。
横河电机CENTUM CS 3000控制系统 整个Cogen电厂包括横河电机监视与控制系统和两台OTSG。OTSG的启动、运行与停车是全自动化的。其中复杂逻辑是由横河电 机、IST与SNC-Lavalin*2的工程师们紧密合作而开发的。
控制室不仅可以显示，它还是工程站。通过它可以访问技术图纸和相关信息，如应用代码和标准以及其他工程信息等。系统仿真器不仅用于操作员培训，同时用于检查和测试CS-3000逻辑中的变化。逻辑的修改可以通过该工程站完成。HART插件实现对 HART I/O的诊断。而且，对该站的访问完全被保护，只有经电厂授权的工程师才可以进入。 每个月，协同工作的J.D.Edwards软件包从横河电机文件中选择输入项，打印出表格和图示，提供维护指南。自从安装了横河电机的 系统后，没有发生过重大维修。另外，CENTUM系统也同样用于蒸汽监控和水纯度控制，以确保供给直流蒸汽发生器(OTSG)的蒸汽 的超高质量。
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