Numerical Simulation Of Power Plant Thermal Discharge In Tidal Water And Calculation Of The Heat Environment Capacity

In recent years, scale of the fire/nuclear power plant of the coastalplanning and construction is growing, and the sea water circulating coolingmode,which release of heat by sea water, is an economic way. But a lot ofcooling water discharged directly into the waters around, led to thetemperature of the receiving water has increased, serious cases may even causethermal pollution of local water problems. How to quantitatively analyzed theheat-affected to the receiving waters by cooling water and the heat carryingcapacity of the receiving waters is a subject that is closely linked to theefficiency of power plants and the aquatic environment.In this paper, it uses depth-averaged two-dimensional flow andtemperature model to simulate flow field and temperature field forLuoyuanwan waters, the model is based on triangular mesh discrete controlequations, which can better fit the shoreline, and uses numerical solution withhigh stability hybridization step. The results by comparison and theexperimental data are in good agreement. On this basis, it predicted hydraulicand thermal characteristics of the discharged cooling water of the three power plant, built or planned in Luoyuanwan, given related data about heat affectedrange. And use the hydrodynamic mathematical model, combined with theflow characteristics within the bay, to give an analysis to waters heat capacityin specific conservation objectives. The research results as follows:(1)It had obvious reciprocating flow characteristics in Luoyuanwanwaters, bay tidal power is strong and hot water reciprocated within the tidalcycle.(2)Hot water with the tide changed significantly migration. Spring tideand neap tide had different heat transport capability in different tidal powerconditions. Hot water in spring tide diffusion speed, low temperature rise areais smaller than neap tide, the typical full-time average is1℃temperature risetidal area is0.99km2, neap tide transport capacity is relatively weak, theperformance of the heat accumulated in the main bay, the typical full-timeaverage is1℃temperature rise tidal area is2.41km2, on the whole neap tide isunfavorable type.(3)Full tide average temperature of spring tide with1℃, and the area isabout0.67km2, envelope area is2.66km2, full tide average temperature ofneap tide with1℃, and the area is about2.61km2, envelope area is5.68km2.High temperature rise area has little influence and mainly focuses on the southbank of Luoyuanwan, full tide average temperature with4℃of spring and neaptide,the area is less than0.05km2, envelope area is0.41km2.(4)Plant water temperature is directly affected by the tide, when taken high water at low tide and when the temperature rise is small at high tide. Theintake instantaneous maximum temperature rise of Kemen plant is up to1.76℃, the minimum value is about0.43℃.(5)According to the water environmental capacity calculation method,apply the temperature control method, take the tand1℃temperature line isnot closed the Kemen waterway as the thermal environment control objectivesof sea waters, and with the mathematical models, getting the results thatcalculates environmental capacity of Luoyuanwan is2516.765m3℃/s, andbay heat capacity utilization reaches64%.