上海某大型污水泵站变频泵节能运行分析

对上海某大型污水泵站的节能方案进行了分析讨论,简要介绍了通用污水泵站的概况以及原有的水泵变频控制技术.依据该泵站现有的运行条件,分析了供水泵站和排水泵站水泵变频运行的必要性以及排水泵站变频节能的基本原理.在原有控制基础上提出了变频泵的节能控制方案,对变频调速的水泵采用最小轴功率法进行最优控制,以改善该泵站的能耗水平,使水泵机组在满足安全运行的条件下能尽量高效运行,达到节能运行的目的.     

杜科公司全变频恒压供水设备被评为上海市节能产品

目前新建楼房的供水大多采用单变频的变频水泵组合,运行中根据用水变化情况投入一台或几台水泵,其中一台采用变频控制确保供水压力稳定,其中的变频水泵经常要在效率不高的低负荷率下运行,因此有很大的节能潜力。中韩杜科公司研发生产的全变频恒压供水设备,系统中的每一台水泵都采用了变频技术,     

泵站经济运行的探讨与研究

介绍了沈阳市李巴彦水处理厂针对二次送水泵房装机运行不经济、能耗高等问题，采用串级调速及水泵叶轮切削技术对机组施行的改造，并优化了水泵运行方式，取得了显著的社会效益和经济效益；总结了切实可行的改造经验；提出了普遍适用于供水行业供水泵站能耗高问题的解决方法和建议     

节能型无塔供水全自动控制器的应用

１前言 河南省南阳卫生学校是一所拥有５０００余名学生的中等专业学校，由于学校用水时间集中，５台水泵无法满足水量、水压的要求，经常出现供水不及时或长时间流水的浪费。根据学校用水的特点，我们对供水系统进行了技术改造，分高峰用水和低峰用水；对供水时间进行了编程定时，使之能全自动供水。高峰时泵全开，低峰时自动关泵，减少了浪费，也降低了水电工的劳动强度，值班人员在值班室即能观察所有水泵的运行情况，及时调整供应，做到用多少供多少，既方便了教学试验课，也方便了学生、教职工的生活用水。２系统简介 （１）压力控制装…     

综合自动化管理系统在某机场二次供水泵站的应用

某机场目前二次供水设备存在设备老化严重、设备运行工况无法实时监控、设备自动化程度低等问题,为此通过技术改造,安装1套综合自动化管理系统,对反映设备运行工况的各项参数进行远程监控,实现对多台水泵轮换运行的自动控制、变频调速、恒压供水,对消毒液及进水进行自动控制,采用高精度数字化仪器仪表对水压、水位、流量、加药量等参数进行精确测量,极大地提高了工作效率和自动化程度。     

应用新科技实现节能供水

灵山县旧州镇水厂日供水量小，峰谷差大，传统设置能耗高。经采用多台小容量、适度场程的电动水泵，应用单片微机控制的运行方式，大大提高了供水的效益，很值得类似单位借鉴。     

22kW水泵变频调速器恒压供水

２２ｋＷ水泵变频调速器恒压供水北京橡胶塑料制品厂我厂３号回水池水泵的变频调速恒压供水系统，自１９９２年３月正式投入运行以来，性能稳定，效果明显。水泵的变频调速恒压供水是把计算机技术与电机驱动合为一体，调节方便，反应灵敏，节电效果尤其显著。工作原理如下...     

新型变频恒压供水设备的应用

沈阳理工大学融通科技开发公司开发生产的新型变频恒压供水设备,采用带有内置PID功能及内置水泵逻辑控制功能的变频器,降低了设备成本,提高了生产效率及设备的可靠性,节省了安装调试时间。新型供水设备经一年多的实际运行证明：系统运行可靠、性能满足要求。     

基于变频器内置PID模块和控制器模块的恒压供水系统设计

由于传统的供水系统设备结构复杂以及自动化程度低设备运行效率低,导致供水效率低、供水不稳定、能耗大、造价高等问题,提出一种内置PID功能模块与控制器模块的变频器,水泵和压力传感器等装置组成的一套智能恒压供水系统。系统自带的控制器模块和PID功能,不仅满足对生活供水的质量、可靠性、节能型等一系列要求,而且利用变频器自带的控制模块,简化控制模型,将以前的机电联控系统中PLC功能模块全部集中到变频器中,降低了成本,解决了PLC外加扩展PID的算法编程难度大,调试困难的问题。运用管网末端的压力传感器收集电压信号输入控制器,进行压力比对后,自带的PID功能调节水泵转速,改变水泵流量,从而达到压力恒定。     

变频调速在水泵节能改造中的应用

针对某冷轧厂除盐水泵恒速运转产生的高能耗现象,对水泵节能改造方案进行分析比较,在水泵原有工频控制系统上增加变频器以达到降低能耗和变流量供水的目标。通过比较水泵改造前后运行经济性表明,改造后节电效果显著。     

Improved control strategy for forced flow solar water heating systems

The solar water heating system functioning on a fixed temperature control (FTC) mode, rather than a differential temperature control (DTC) mode (continuous water flow rate), has appreciable advantages for saying parasitic power consumption and reducing the maintenance cost. A computer simulation model, using a numerical analysis method, has been developed to study a forced flow solar water heating system taking into account the realistic conditions of operations. It is noted that the most critical parameter in designing such types of system is the water flow rate. The results are obtained, corresponding to a solar water heating system of 4000 1/day capacity working at an average temperature of 60°C.     

Optimization of Stirling engine performance based on an experimental design approach

The Stirling engine performances depend on several physicals characteristics and functioning parameters. The influence of each parameter and of their interactions is difficult to achieve with classical univariate studies. The experimental design is an alternative to identify the parameters sets allowing optimal Stirling engine performances. Hence, a four factor Central Composite Rotatable Design was used to observe the effect of cooling water flowrate, initial charge pressure, heating temperature, and operation time on a Stirling engine brake power. The influence of each parameter and the effect of the interaction between two or three parameters on the engine performances are presented and discussed. Using the surface response method, it appears that initial charge pressure and heating temperature are the more influencing parameters on the Stirling engine performances. With modeling, optimal conditions for the Stirling engine functioning are the following: charge pressure of 8 bar, heating temperature of 500 °C, and cooling water flow rates of 7.34 l/min, independent of the engine operation time. Copyright © 2012 John Wiley & Sons, Ltd.     

线芯自控温解决太阳能热水器管路防冻问题及节能研究

由于真空玻璃管的广泛应用使得太阳能热水器在冬季应用中也成为现实,可是上水管尽管采取保温措施,在东北的冬季和寒冷的高山地区也将结冻,采取线芯自控温电伴热系统措施可以完美解决上水管冬季防冻问题。     

Heat transfer problems for the production of hydrogen from geothermal energy

Electrolysis at low temperature is currently used to produce Hydrogen. From a thermodynamic point of view, it is possible to improve the performance of electrolysis while functioning at high temperature (high temperature electrolysis: HTE). That makes it possible to reduce energy consumption but requires a part of the energy necessary for the dissociation of water to be in the form of thermal energy.

A collaboration between France and Iceland aims at studying and then validating the possibilities of producing hydrogen with HTE coupled with a geothermal source. The influence of the exit temperature on the cost of energy consumption of the drilling well is detailed.

To vaporize the water to the electrolyser, it should be possible to use the same technology currently used in the Icelandic geothermal context for producing electricity by using a steam turbine cycle. For heating the steam up to the temperature needed at the entrance of the electrolyser three kinds of heat exchangers could be used, according to specific temperature intervals.     

Semi-empirical characterization of a greenhouse-effect cascades solar distiller

The analysis in steady state of the different modelizations made on solar flat-plate functioning in low and average temperatures (especially the bridges of surface water) has allowed us to develop a simple linear model. By a swift experimental way, this model is able to approximate the thermal and optical performances of a greenhouse-effect solar distiller. This model has equally served for the verification of the time constant of the system in the same functioning and environment conditions.     

供水系统实现计算机高效控制的技术途径和意义

为优化供水系统的生产调度,提高运行效率,节约用水和降低能耗,探索了独立供水系统实现计算机高效控制的途径,文章将测控系统划分为信号检测与信息上传子系统、计算机控制中心子系统和信息下传与控制子系统三大组成部分,描述了每一部分的组成结构,阐述了对应的功能。对一些重要功能和设计过程中的重要问题提出了建议,最后指出了供水系统实现计算机控制五个方面的作用和意义。     

中央空调水系统的节能改造技术与实践

结合既有建筑的中央空调水系统的设计与运行状况,分析与讨论了水系统的节能改造技术,以及所产生的节能效益、经济效益、系统运行的可靠性与安全性,得出了既有中央空调水系统的节能改造技术有:主机变频、空调泵变频、水蓄冷等;非线性、大滞后的中央空调水系统适合采用智能控制算法。多项工程节能改造表明:中央空调水系统的各项节能率为20.5%~31%,不到2~4年可以回收节能投资,而且空调系统运行正常,室内温湿度满足要求。     

阳煤三矿报废矿井防治水设计

阳煤三矿已经开采完成处于报废关闭阶段,但是报废后矿井水会对周边矿井产生较大的影响。因此,需要做好三矿报废后矿井防治水工作。通过分析三矿报废后矿井涌水量,制定了2个防治水方案,并对比了2个方案的优缺点和工程量。     

Fuzzy controlled central heating system

In this paper a comparison study was carried out in order to understand how two different systems, classical and fuzzy logic control of central heating affect the economy and comfort of private homes or offices. Also a literature review was done to help decide which one of these systems is more effective. The objective of the fuzzy controller heating system is to estimate the actual heat requirement of the house. It uses a total of five inputs, four of which are derived from energy consumption curve, using conventional digital filtering techniques; the fifth is the average outdoor temperature, whereas, the classical control system burns diesel type fuel in its furnace to heat the water supply (boiler). From the boiler, the hot water is distributed by a pipe system to the individual radiators in the house. Thereby, it is shown that the fuzzy controlled heating system is more effective, also it maximizes the economy and the comfort of the consumer. Copyright © 2002 John Wiley & Sons, Ltd.     

浅析煤矿矿井水害防治措施

为有效预防和控制煤矿水害的发生,切实做好煤矿企业的水害防治工作,煤矿水害防治措施的研究已经迫在眉睫。通过对矿井充水因素分析,提出水害防治技术措施及保障措施,为矿井水害工作提供一定参考。