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首页> 外文会议>ISA EXPO 2009 >Comparison of Brockton, MA Aeration Basins Dissolved Oxygen Control Strategies: Most-Open-Valve vs. Blower VFD Speed Control
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Comparison of Brockton, MA Aeration Basins Dissolved Oxygen Control Strategies: Most-Open-Valve vs. Blower VFD Speed Control

机译：马萨诸塞州布罗克顿曝气池溶氧控制策略的比较：多数开阀与鼓风机VFD速度控制

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摘要

The cost of the aeration process accounts for approximately 50 to 60 percent of the fixed energy expenditures in a wastewater plant [1]. Controlling this cost can result in significant energy and monetary savings. Furthermore, the efficiency of phosphorus removal in many full-scale plants has been found to be completely related to the efficiency of the dissolved oxygen (DO) control loop [2], making it imperative that the type of DO control loop type selected provides a reliable solution. While different control options can be used to regulate the amount of air diffused into an aeration basin, the best control method will successfully maintain stable DO concentration in the basin while minimizing blower load and utility power usage.rnThis paper offers a basic description of the newly implemented DO control methods used at the Advanced Water Reclamation Facility (AWRRF) in the city of Brockton, Massachusetts. The influent plant flow is divided between the north side and the south side of the plant. While the north aeration basins use variable frequency drives (VFDs) to control four positive displacement blowers' speed and consequently the air flow into the aeration basins, the south aeration basins use a most-open-valve (MOV) control strategy to control three centrifugal blowers.rnThe primary goal of this study was to determine which control method stabilized DO concentration in the aeration basins while minimizing the utility power used and maximizing energy efficiency. After comparing the two methods of DO control it was clear that while the variable frequency drives maintained a steady DO set point, the most-open-valve strategy was more energy efficient for the plant's operation.
机译：曝气过程的成本约占废水处理厂固定能源支出的50％至60％[1]。控制此成本可以节省大量能源和金钱。此外，已发现许多大型工厂的除磷效率与溶解氧（DO）控制回路的效率完全相关[2]，因此必须选择的DO控制回路类型提供一个有效的解决方案。可靠的解决方案。虽然可以使用不同的控制选项来调节扩散到曝气池中的空气量，但最佳的控制方法将成功地保持池中DO的浓度不变，同时最大程度地减少鼓风机负载和市电使用量。在麻萨诸塞州布罗克顿市先进的水回收设施（AWRRF）中使用了已实施的DO控制方法。流入的植物流在植物的北侧和南侧之间分配。北部曝气池使用变频驱动器（VFD）来控制四个正排量鼓风机的速度，从而控制进入曝气池的空气流量，而南部曝气池则使用最开阀（MOV）控制策略来控制三个离心式风机。这项研究的主要目的是确定哪种控制方法可以稳定曝气池中的溶解氧浓度，同时最大程度地减少使用的市电并最大化能效。比较了两种DO控制方法后，很明显，尽管变频驱动器保持了稳定的DO设定点，但最开阀的策略对于工厂的运行更加节能。

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