PLC滤池自动控制系统.doc

摘要 自来水厂供水至关重要。随着现代城市社会和经济的发展，城市用水量不断增大，供水不足已成为城市发展的瓶颈。地下水资源的利用率接近饱和,增加地表水供应量是解决供水不足问题的唯一可行途径。供水不仅要满足管网的需要、保证充足供水,还要求水质明显提高。因此对水厂关键工艺进行升级改造,以提高其水处理能力,增加出水量,这是满足城市发展需求的有效途径。滤池是水厂的网状结构的常规治疗的最后一步。滤池的操作直接影响到自来水厂的出水水质。 本文的研究目的是系统地解决了供水企业的自动化控制过滤器反冲洗过程的复杂过程。如果手动方法仍在使用，劳动强度高，工作效率低。，安全性难以保证。因此，必须修改过滤器自动化系统。本文主要开展以下工作：详细分析和回顾供水企业自动化的发展历史，自动化系统的类型以及供水企业自动化的应用。简要介绍了水厂过滤过程。滤池的液位控制以及反冲洗控制和控制策略作了分析。相关PLC硬件联接以及程序的编写和组态仿真。 ?? 关键词： PLC 水厂滤池 反冲洗 液位控制 Abstract Water plant water supply is essential for people. As the modern urban society and economic development, urban water consumption continued to increase water supply insufficient has become the bottleneck of the urban development, the use of groundwater resources is nearly saturated, increasing the supply of surface water is the only feasible way to solve the problem of inadequate water supply. Water supply not only to meet the needs of the pipe network, to ensure adequate water supply, but also significantly improve the water quality. Therefore, the critical process of the water plant upgrade to improve its water treatment capacity, increasing the amount of water is an effective way to meet the needs of urban development. The filter is the last of the waterworks net structure of the conventional treatment process, the filter is running a direct impact on water quality of the water treatment plant. The goal of this thesis is a systematic approach to solving water supply automatic control filter backwash process, the continued use of artificial means, labor-intensive, low efficiency, security is difficult to protect, and this must be the transformation of the filter automation systems. In this paper, the following work: A detailed analysis and synthesis of the history of the development, the type of automation system and water supply enterprise automation of water supply enterprise automation application status. A brief introduction on the water plant filters process. Filter the liquid level control, and backwash control an