Through tests in the field

the exhaust steam pressure under different operation modes of circulating water pumps for 200 MW units at certain atmospheric temperature and typic load has been measured

and the power increament of steam turbine under different operation modes of the circulating water pumps being obtained according to the power correction curves

compared with the power consumption of circulating water pumps

the optimal operation mode of circulating water pumps can be determined.The optimized operation mode chart can be worked out

accourding to the lay-out of circulating water pumps in Qinling Power Plant

the turbines and pumps can be grouped into four operation modes

namely 2 turbines with 2 pumps

2 turbines with 3 pumps

2 turbines with 4 pumps

and 2 turbines with 5 pumps

being flexible and convenient

reaching the purpose of enhancing the conprehensive efficiency of power plant.