System and method for stably controlling concentration ratio of circulating water in thermal power plant

Abstract

The invention relates to a system and a method for stably controlling the concentration ratio of circulating water in a thermal power plant. The method comprises the following steps of: obtaining historical data of the water supplement quantity and pollution discharge water quantity of a circulating water system of a thermal generator set and the liquid level of a cooling tower, obtaining real-time data of evaporation air blowing loss of the circulating water system through the mode of water balance, and establishing a circulating water evaporation air blowing loss prediction model by taking the evaporation air blowing loss as a dependent variable and taking an online parameter closely related to the evaporation loss of a thermal generator set as an independent variable; carrying out a dynamic simulation test on the circulating water system to obtain a reasonable value of the concentration ratio of the circulating water system, taking the value as an input value of the circulating water evaporation air blowing loss prediction model, and calculating the real-time water supplement quantity and pollution discharge water quantity of the circulating water system for regulating and controlling the water quantity. The method can maintain the stable control of the concentration ratio of the circulating water of a thermal power plant for a long time, has an obvious water-saving effect,and can prevent scaling and corrosion of condenser pipes.

Description

Technical field [0001] The invention belongs to the technical field of industrial water saving, and in particular relates to a system and method for stable control of the circulating water concentration ratio of thermal power plants. Background technique [0002] Thermal power plants are large industrial water users. From the perspective of economic operation and environmental protection, saving power generation water is of great significance. Among all water systems in thermal power plants, the circulating cooling water system consumes the most water. Therefore, water-saving transformation of the circulating cooling water system is the focus of water conservation in thermal power plants. [0003] During the operation of the circulating cooling water system, the inlet water of the system is the make-up water for the cooling tower, and the outlet water mainly consists of two parts, one part is evaporative wind loss (including leakage loss), and the other part is the sewage of circul...

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Problems solved by technology

This method of manual sampling and analysis is intermittent sampling, and there is obvious hysteresis and instability in adjusting the concentration ratio in this way

In addition, chlorine ion selective electrodes are also used for online monitoring, but due to the poor quality of circulating water, the problem of online instrument drift is serious, and the electrodes are not stable enough and need to be replaced frequently. The price is also relatively expensive and is not suitable for industrial applications.

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