PLC在变频调速多泵并联供水系统中的应用

为使供水设备获得高可靠性，低成本，介绍了在硬件结构和软件编程上充分开发PLC资源，用低点数的PLC巧妙地实现了恒压供水设备的多功能要求，经过多年实验，证明了变频调速多泵并联供水装置是一种节能，节水、功能完备的供水设备，该设备在高楼供水和采暖锅炉补水中得到广泛应用，颇受用户的欢迎。     

PLC控制变频器输出频率的一种方法

可编程序控制器和变频器构成的控制系统中,用可编程序控制器直接控制变频器输出频率的系统还比较少,即使有也大多是通过用可编程序控制器的开关量输出对变频器的多档频率控制端口进行控制,以改变变频器的输出频率,而可编程序控制器只是完成开关量的控制,这无疑是一种设备的浪费.     

我国供水系统中出现红虫的原因与防治措施

1供水系统中出现红虫的原因 ①来自供水处理系统。“红虫”属底栖动物，原水经预加氯、加药、混凝、沉淀、过滤、加氯处理后成虫在水中存在的可能性极小，但不能排除虫卵进入供水管网的可能性，由于虫卵较小并对外界的抵抗力强，可随时进入休眠，当环境条件适宜时则孵化为成虫。摇蚊幼虫必须经羽化才能进行繁殖，因此其不会在供水管道内进行繁殖，但由于滤池、清水池上方有空间，可使成虫进行群飞交尾而产卵，在滤池内的有可能被截留，而在清水池内的则直接进入供水管网。由于水蚯蚓和红线虫的成虫可耐受低氧条件，故在供水管道内进行繁殖的可能性比较大。     

关于马圈4500t／d选矿厂供水方案的探讨

洛阳栾川钼业公司马圈选矿厂３０００ｔ／ｄ技改工程的实施，使马圈选矿厂的生产规模达到４５００ｔ／ｄ，生产用水出现危机。提出了解决问题的方案与建议。     

蓄水装置水温,水位的自动调节与控制

利用电气装置对浴池蓄水供水系统进行了改造，使水温，水位实现了自动调节，每月可节水４００ｔ，方便了工人操作。     

万家寨水利枢纽施工前期准备工程

万家寨水利枢纽的施工前期准备工程项目多、时间短、任务艰巨。文章介绍了万家寨施工供水、施工供电、施工通信、人工砂石系统以及混凝土系统等施工前期准备工程的设计和施工，并总结了准备工程设计、招标、概算编制等方面的经验和体会。     

变频设备在供水系统中的合理设计与优化应用

对郑州市自来水总公司在供水系统中应用变频器的经验进行总结讨论，论述了变频调速技术在供水系统应用的现状，对设备选型、运行维护和设备优化运行等方面谈了自己的看法和建议。     

智能模糊给水控制器的设计开发

在供水系统中,水泵的耗电量占总耗电量的21%以上,采用变频调速技术对水泵运行进行技术改造,可节电20%～50%,既节约了资源,又提高了系统的响应速度和调节精度.     

Evaluation of the exploitation of nontraditional water resources—— Case study of Yantian District in Shenzhen

Yantian District in Shenzhen is a water deficient area. Water shortage has become a major obstacle to its further economic progress. Consequently, rational exploitation of nontraditional water resources(NWR)has been naturally adopted to increase local available water volume. The purpose of this paper is to analyse the exploitation of two kinds of NWR, namely wastewater reuse and seawater utilization, in Yantian District, and assess the contribution of each mode to deal with the water crisis. Two different nontraditional water supply systems respectively based on the reclaimed water and sea water were presented, and the effects of each system were evaluated in terms of technology, economy and environment. The result shows that both wastewater reclamation and reuse (WRR) and direct utilization of seawater (DUS) are of great importance to cope with the tight water resource situation in the district. The data indicate that the fresh water saved by WRR system and DUS system is 29 and 17 million m3/a respectively. Moreover, the BOD, COD, NH3-N and T-P reduced by the WRR system are 870, 2900, 725 and 87 t/a, respectively. Considering the integrated effectiveness, the development of WRR system, which is of specific significance to exploiting new water resource and save natural fresh water supplied from distant water diversion project, is the preferred methods used to solve the water shortage problem in Yantian District and recover the water environment as well as maintain the sustainable development of the city zone.