Quantitative calculation by programming was used to analyze the relationship between the inlet temperature variation of circulating water and the operating mode alterations of circulating pump as well as the unit economy

based on the arrangement characteristics of circulating water system in a power plant.Moreover

the temperature fields of the drainage in hot and cold season were numerically simulated by Fluent

and its influence on surrounding water environment were discussed

too.Results show that

when the circulating water temperature is below 4 ℃

the optimal operation is running 2 units with 2 pumps;when the circulating water temperature ranges from 4 ℃ to 10 ℃

2 units with 2 or 3 pumps can be adopted;while when the circulating water temperature is higher than 10 ℃

it is best to run 2 units with 3 or 4 pumps

and the optimum circulating water temperature for 2 units with 4 pumps operation mode is 22 ℃.The influence of water intake and drainage on water environment in cold season is larger than that in hot season.