Numerical Simulation Of Thermal Water Discharge For Muyin Plant In LAMATANG Water Area Of Indonesia

Along with the economic development in recent decades, electricity demand is increasing in all sectors, so the state conducted extensive nuclear power plants, hydropower and thermal power plant construction projects. Waste water discharges from power plants into and spread in natural rivers, Choosing water intake and outfall location inappropriately will affect efficiency of power plants and may probably threat to plant safety seriously. Environmentally speaking, thermal water discharge can be sure to pollute environment, and affect the structure of aquatic species. The accurate assessment of power plant waste water emissions is a Basement to choose the water intake and outfall location to evaluate the Environmental affect. Physical models and numerical simulation is the main methods to research thermal discharge. Now for the thermal water discharge research, the numerical simulation is taking the place of Physical models slowly because it is Faster, more accurate and efficient. With the widely concern of the river ecosystem restoration and reconstruction, thermal water discharge researches are far beyond the requirements of safe production, and are given more expectations and content.Based on the comprehensive overview of related fields, combining with alluvial rivers basic characteristics, this paper set up two-dimensional mathematical model of the temperature diffusion to simulated power plants thermal water emissions in LAMATANG River using closed RNG k-εmode Reynolds equation. As the input water location has been identified, three sections downstream of water intake location are chosen to compare which one is the best to be the outlet location. Three kinds of outlet velocity distribution and temperature rise range were given and compared, then the best outlet location was given in this paper, the main conclusions are as follow:1. Based on the comprehensive overview of related fields,a further study was given after a comprehensive understanding of the physical model and numerical simulation methods on thermal water discharge; A further study has been continued in the Turbulence simulation methods, discrete methods and special handling methods of boundary conditions in numerical simulation area.2. Hydrodynamic simulation software such as FLUENT and related processing software such as GAMBIT,TECPLOT are studied.3. With the specific engineering, Two-dimensional temperature diffusion model was set up in the conditions that the quantity of water is 35m~3 / s, water temperature 10℃after the calculation area was certain. with the characteristics of the inland river flow (962 m~3/s,508 m~3/s,180 m~3/s,108 m~3/s), the velocity distribution and the temperature range near the outlet location in 12 kinds of conditions were calculated.4. Through the velocity field and temperature field analyzed, the best outfall location was given to provide a reference for the design of power plant outfall given.