Design of water supply control system for thermal power plants based on PLC
基于PLC的火力发电厂供水控制系统设计

摘要

火力发电厂作为用水大户，对供水质量和设备稳定性要求极高。传统供水系统多采用人工调节或继电器控制，存在自动化程度低、能耗高、供水质量不稳定等问题，难以满足现代火力发电厂需求。为了应对这些情况，首先，需求分析调研火力发电厂供水系统的现状和存在的问题。明确系统需要监测和调节的参数，如供水压力、流量、水质等。其次，进行系统架构设计：设计系统的整体架构，确定系统的自动化程度、可靠性、扩展性等要求。使用PLC编程软件编写控制程序，设计主程序和子程序，实现数据采集、数据处理、逻辑判断、控制输出等功能。将硬件设备和软件程序进行集成，进行系统联调。对系统进行功能测试和性能测试，确保系统能够稳定运行。根据测试结果对系统进行优化和调整，提高系统的性能和可靠性。

Abstract

Thermal power plants, as significant water consumers, have extremely high requirements for water supply quality and equipment stability. Traditional water supply systems, often relying on manual adjustment or relay control, suffer from low automation levels, high energy consumption, and unstable water supply quality, making it difficult to meet the demands of modern thermal power plants. To address these challenges, this study first conducts a needs analysis to investigate the current status and existing problems of the water supply system in thermal power plants. It identifies the parameters that need to be monitored and regulated, such as water supply pressure, flow rate, and water quality. Subsequently, a system architecture design is carried out, outlining the overall structure of the system and defining requirements for automation, reliability, and scalability. Control programs are developed using PLC programming software, including main programs and subroutines, to achieve functions such as data acquisition, processing, logical judgment, and control output. The hardware devices and software programs are then integrated and subjected to system commissioning. Functional and performance tests are conducted to ensure stable system operation. Based on the test results, the system is optimized and adjusted to enhance its performance and reliability.