The benefits of flow control within the water industry
流量控制在水工业内的参与可以分为两个主要区域：饮用水和废水。这两个领域对我们所有人的生活都是必不可少的。当我们打开水龙头时，饮用水的可用性以及如何管理污水和污水是我们都依靠的关键服务。执行器是饮用和废水应用中的关键设备。本文将研究这些应用程序的要求和挑战，并将重点介绍流程控制设备如何使世界各地的水站平稳运行和成功的示例。
What is flow control?
Actuators operate and move valves and are the key items of equipment in flow control.. They can be electrically, hydraulically or pneumatically controlled. Effective flow control helps to improve efficiencies and increase water supply. Many operators in water require valves and dampers to move repeatedly between set positions. They are involved in a variety of applications including filtration, desalination, distribution, dams, reservoirs and irrigation systems. The ability of actuators to do this makes processes more efficient, minimises waste and reduces energy consumption.
电动执行器在更广泛的水行业中很常见。它们提供精确的操作，具有可重复性和分辨率。水应用中的流量控制设备必须具有防水保护，以提供持续的操作并确保可靠性。旋转智商范围内的执行器在工厂中被环境密封。它们在20m时双密封至IP66/68，持续10天，可保护内部组件免受水，水分，污垢和灰尘的影响。在水应用中，即使在极端环境中也必须使用最小的维护设备，耐用的设备也很小。例如，在2021年，旋转船将IQ3执行器提供给新西兰的几个水处理地点。以前，这些地点有气动执行器，但由于潮湿的氯化气氛，需要环境密封的电动执行器。新的执行器可以控制过滤器，以及饮用水的化学剂量和储存。电动执行器对操作员有另一个好处：他们不需要电力压缩机即可为气动执行器提供空气供应。
饮用水
There are different ways of creating water suitable for drinking. Flow control can be found in almost every process control application in sea water desalination plants and freshwater treatment plants, from import to distribution. Filtration is a key process in these applications. Partially treated water passes through a medium that strains it, such as sand or anthracite. Different types of filters are used, such as simple slow sand filters or rapid gravity sand filters. Flow control is critical in the filtration process. 300 IQ actuators were installed at a US water filtration plant as part of an upgrade in 2020. They operate 12-to-30-inch butterfly valves at Eugene Sawyer Water Purification Plant in Chicago to provide improved flow control for water travelling into and out of the facility’s sand filters.
废水处理
废水的处理及其未来的排放或再利用（例如在灌溉系统中）需要专业设备和精确控制才能遵守严格的环境法规。执行器的使用和随后的自动化可确保有效的废水处理和保护环境。经过当地政策的约束，经常将经过处理的水返回海或其他水源。流量控制对于此过程至关重要。2020年，电动CK执行器被命令控制土耳其Ergene Basin Deep Marine Expration项目的流量，这是欧洲最长的海洋排放线之一。电动执行器在治疗厂运行PENSTOCKS。在这种情况下，执行器必须在高温和苛刻的环境中可靠地运行。