水厂自动化供水系统的优化设计

发布时间：2018-05-23 22:02

本文选题：变频 + 恒压供水　；参考：《电子科技大学》2014年硕士论文

【摘要】：自从改革开放以来我国经济快速发展,城市的建设和人民生活水平的不断提高使得城市的需水量增大,因此对城市供水系统提出了更高的要求,供水的可靠性、稳定性、经济性直接影响城市的建设和经济的发展,也影响到了居民的正常生活和工作。变频恒压供水技术是近年来我国大部分水厂供水系统发展的方向,这项技术需要的硬件设备很关键,国外水厂在自动化控制方面使用的硬件设备功能及要求都高于我国。90年代我国引进了变频器和PLC技术,现在国内大多数水厂使用单一的变频供水或使用PLC进行大泵配小泵控制的供水方式,这种两种控制方式涉及范围小控制单一对于供水量变化大的水厂不能做到持续恒定的压力控制。国内大多数水厂现在依旧使用的是上述控制方式,它们都不能满足国家要求供水行业提高供水质量进行优质供水的要求。本文根据对国内使用过的多种供水压力控制方法进行分析,针对大型供水量变化大的水厂提出了供水系统的优化设计方案。本文首先了解国内外供水系统的现状,分析国内各种供水系统的性能、使用效率、成本、对供水管网的影响等,选定恒压供水的方案。其次对变频器、软启动器和PLC等设备及RSLogix5系列工控软件的性能及原理做了详细的分析并就如何应用在供水控制中做出了说明。根据水厂恒压供水要求设计出硬件控制电路,将变频器、软启动器和PLC等设备组合成水厂自动恒压供水的控制系统。最后使用罗克韦尔公司的RSLogix5系列工控软件对PLC进行编程使系统达到自动化恒压供水的要求,使用RSview软件编制上位机的操作界面。本系统控制方式采用集散控制,设置PLC供水子站,子站采集供水水泵数量、清水池水位、出水压力、出水流量、泵房积水、自用水泵数量、自用水压力、水泵变频器频率等数据,通过PLC工控程序演算返回设备控制,使水厂供水系统达到自动调节水量恒定出水压力合理分配城市供水与水厂自用水水量及水压,实现水厂供水全自动化。
[Abstract]:Since the reform and opening up, the rapid economic development of our country, the construction of the city and the continuous improvement of the people's living standard have increased the water demand of the city. Therefore, higher requirements have been put forward to the urban water supply system, the reliability and stability of the water supply. Economy directly affects urban construction and economic development, but also affects the normal life and work of residents. Frequency conversion and constant pressure water supply technology is the development direction of water supply system in most water plants in China in recent years. The hardware equipment required for this technology is very important. The functions and requirements of the hardware equipment used in the automatic control of water plants abroad are higher than those of the inverter and PLC technology introduced in China in the 1990s. At present, most domestic water plants use a single variable frequency water supply or a water supply controlled by large pumps and small pumps using PLC. These two kinds of control methods involve small range control. Single water plant with large water supply can not achieve constant pressure control. Most domestic water plants still use the above control mode, they can not meet the requirements of the state water supply industry to improve the quality of water supply for high-quality water supply. Based on the analysis of various water supply pressure control methods used in China, this paper puts forward the optimal design scheme of water supply system for large water supply plants. In this paper, the current situation of water supply system at home and abroad, the performance, use efficiency, cost and influence on water supply network of various water supply systems at home and abroad are analyzed, and the scheme of constant pressure water supply is selected in this paper. Secondly, the performance and principle of inverter, soft starter and PLC and RSLogix5 series industrial control software are analyzed in detail, and how to apply them in water supply control is explained. According to the requirement of constant pressure water supply in water plant, the hardware control circuit is designed. The inverter, soft starter and PLC are combined into the automatic constant pressure water supply control system of water plant. Finally, the RSLogix5 series of industrial control software of Rockwell Company is used to program the PLC to make the system meet the requirement of automatic constant pressure water supply, and RSview software is used to compile the operation interface of the upper computer. The control mode of the system is distributed control, PLC water supply sub-station is set up, the sub-station collects the quantity of water supply pump, the water level of clear water tank, the pressure of outlet water, the discharge of water, the amount of water in pump room, the quantity of self-use water pump, the pressure of self-using water. The frequency data of water pump frequency converter are calculated by PLC industrial control program to return to the equipment control, so that the water supply system of water plant can automatically adjust the quantity of constant effluent pressure and reasonably distribute the amount of water and water pressure of the city water supply and the water works for their own use. Complete automation of water supply in water plant is realized.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.62

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