Actuation upgrade improves power station combustion efficiency
19/09/2011
旋转electric modulating actuators have been installed in an upgrade at the RWE npower Fawley Power Station in southern England. Built in the late 1960s, the oil-fired station is capable of supplying the National Grid with 1000 megawatts of power to balance supply and demand at times of peak usage. It is therefore essential that the station can respond to the National Grid demands with speed and flexibility.
旋转式执行器已取代了过时的液压致动器和电源包，这些执行器需要增加昂贵和耗时的维护水平，并提出涉及使用液压油的持续问题。这些包括高运行压力以及与泄漏相关的安全性和环境问题的潜力。电源包还需要连续电源以保持液压。相比之下，旋转执行器仅在运行时才使用电力，并且不需要常规维护。
The upgrade project was awarded to Exeeco Actuation Projects and Service (APS), a company that specialises in power station maintenance and upgrade services. APS responsibilities encompassed the removal of old equipment, installation of new actuators, wiring into new local junction boxes, commissioning and product training for staff at the station.
The retrofitting began on the station’s Unit 1 during the 2009 outage period with the installation of Rotork Type LA linear stroke actuators on reheat and super heater dampers and electric feed pump speed regulators. This was followed by the installation of Rotork Type SM6000 lever arm actuators on ID (induced draft) and FD (forced draft) fan discharge dampers. Upon completion of the project, a total of sixteen Type LA and four Type SM6000 actuators have now been installed on Units 1 and 3.
The Rotork Type LA actuators deliver a self-locking linear stroke output of up to 610mm (24 inches) at the rate of up to 2000 starts per hour. Rotork Type SM6000 actuators deliver a self-locking rotational output ranging from 90º to 313º for continuous, unrestricted modulating duties. Both types are specifically designed for the high temperatures, challenging environments and arduous duty cycles associated with power station operations. At Fawley the actuators are operated by the station’s existing Emerson Ovation DCS system utilising 4-20mA signals for position demand and feedback.
参考Fawley Power Station的合同，APS技术销售工程师Simon Finley评论说：
“This is an excellent demonstration of our ability to deliver complete actuation solutions, including the supply, design interface, installation and commissioning of our products.”