Power generator internal cold water quality monitoring control system based on multi-point control

Abstract

The invention relates to an internal cold water quality monitoring control system applicable to a power generator with a stator bar made from red copper. The traditional domestic and overseas internal cold water quality adjusting devices all have problems of large water quality fluctuation and poor safety due to the use of alkali adding systems using a single-point control method. According to the invention, two paths of sampling points are arranged on a water inlet mother pipe and a water return mother pipe of a stator cooling water tank; an online pH meter and an online conductivity meter are mounted on each path of sampling points; the pH meter, the conductivity meter and a stator cooling water pump in the internal cold water system are connected with a PLC (Programmable Logic Controller) controller by signal wires; the PLC controller is embedded with a PID (Proportion Integration Differentiation) control algorithm program applicable to the internal cold water system and based on expert control rules; and the PID control algorithm program is used for processing the collected real-time data according to set rules and controlling the starting and stopping of an alkali adding metering pump according to an operation result. By using the multi-point control method provided by the invention, more complete interlocked protective function is realized, the excessive adding of the alkali liquor is completely eliminated and the safety of the internal cold water system is assured.

Description

technical field [0001] The invention relates to the field of water quality monitoring and control, in particular to a water quality monitoring and control system for inner cooling water of a generator whose stator bar is made of copper. Background technique [0002] At present, there are four main water quality adjustment methods commonly used in the internal cooling water system of generators: ordinary small mixed bed method, basic resin adjustment method, alkali addition method and condensate water ratio replenishment method. The more common application is the alkali addition method. Currently there are A large number of alkali adding devices are used in generator systems at home and abroad. However, at present, the principle of internal cooling water quality adjustment devices at home and abroad is to control the conductivity of the stator cooling water tank as the core of the single-point control, that is, to set up a sampling port on the jellyfish tube of the stator coo...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of unstable water quality control and poor safety caused by the single-point control method of the existing alkali adding device, the present invention provides a multi-point control, expert-based The generator internal cooling water quality monitoring and control system with PID controller can stably control the internal cooling water quality at the set value, completely eliminate the occurrence of excessive alkali addition, and greatly improve the safety of the internal cooling water system

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