Method for determining optimized operation mode of closed circulating water system of thermal power plant

Abstract

The invention provides a method for determining an optimized operation mode of a closed circulating water system of a thermal power plant. The method comprises the following steps of A, acquiring the variable quantity of outlet water temperature of a cooling tower when the operation mode of a circulating water pump is switched; B, acquiring condenser characteristic parameters and curves; C, acquiring the unit load, the circulating water pump operation mode and the circulating water inlet temperature; D, changing the operation mode of the circulating water pump, and determining the amount of temperature change and the power consumption of the circulating water pump; E, calculating the back pressure of a turboset, calculating the turbine power according to the back pressure, and calculating the net increase output of the turboset according to the power; and F, taking the condition of the maximum net increase output as the optimal operation mode of the circulating water pump in the current state. The method has the advantages that the influence of temperature change is compensated in calculation, so that the accurate unit back pressure is obtained, the result accuracy is improved, the optimal operation mode can be accurately determined, the optimization effect is improved, and the economical efficiency of unit operation is improved.

Description

technical field [0001] The invention relates to the technical field of optimal operation of a closed circulating water system of a thermal power plant, in particular to a method for determining an optimal operating mode of a closed circulating water system of a thermal power plant. Background technique [0002] The optimized operation of the circulating water pump in the closed circulating cooling water system of thermal power plants is an important link to reduce the heat consumption of generating units. In the closed circulation cooling water system, the circulating water pump circulates the cooling water between the condenser and the cooling tower through continuous work, so that the circulating water pump becomes one of the most power-consuming equipment in the thermal power plant. The electricity accounts for about 1% to 1.5% of the total power generation, and the operation mode of the circulating water pump has a great influence on the exhaust pressure of the steam tur...

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Problems solved by technology

However, during the test, after increasing the circulating water flow rate, the outlet water temperature of the cooling tower (that is, the circulating water inlet temperature) will also increase. As a constant value, it will bring a large error and affect the effect of the optimization experiment

On the other hand, trying to theoretically calculate the temperature change of the circulating water outlet tower under different operating modes of the circulating water pump requires a detailed thermal calculation of the cooling tower under variable working conditions. At the same time, it is necessary to provide the thermal characteristic data and resistance characteristics of the cooling tower during the calculation process. data and real-time environmental meteorological condition data, this method is complex and computationally intensive in actual operation, which brings a lot of inconvenience to the application

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