The vacuum in condenser is one of the factors affecting the output capacity of unit

the said vacuum depends mainly on the parameters of condenser and circulating water.An effective method for maintaining the vacuum in condenser is to change the flow rate of circulating water according to its different inlet temperature.For the circulating water system

where the flow rate of circulating water can't be continuously changed

it is necessary to optimize the grouping operation of circulating water pumps at various loads of unit and at different inlet temperature of circulating water

and this has important significance for economic operation of the power plant.Directing against the AP1000 nuclear power unit at home

combined with specialities of the thermodynamic system for said unit

the optimal operation mode of circulating water system at different load of unit and different inlet temperature of the circulating water has been determined on the basis of calculation for variable operating conditions

and based on the mathematical model of circulating water system optimization

providing basis for operation optimization of the unit.