The Study Of Cold Drain Of Coastal LNG Project Cycle Optimization

With the rapid development of China’s economy and the development and utilization of marine resources, the demand of China for energy continues to increase, more and more nuclear power/thermal power plant and the LNG project came into being. Natural geographical advantage of coastal areas has become the first choice of LNG project site, but LNG projects bring economic benefits and convenience it also brings a lot of pollution problem, cooling water of power plant and cold water of LNG project to the Marine environment impact is embodied in the local area can make compared to the thermal discharge is the temperature rise of the local bodies of water drainage is the opposite of cold water temperature will reduce the local water body temperature increases or decreases the local area affected. Therefore, out of consideration for marine environmental protection and safety and economic benefits of the project, the drainage of cold tide and temperature fields and through the numerical simulation of temperature field of cold outfall different layout schemes, pollution of the grasp of LNG cold wastewater generated range of practical significance.This paper uses MIKE 21FM model which is a flat two-dimensional mathematical model developed by the Danish Hydraulic Institute, now the application of this software in China has developed rapidly, and is widely used in a number of major projects, the model uses the unstructured triangular mesh generation computational domain, triangular mesh can better fit the land border, the focus of grid design is flexible and can easily control the mesh density in key areas of marine engineering, stable and reliable results of the calculation for the study of the drain and cool design LNG project environmental impact of drainage provide a important basis.The major research and achievement are as follows:(1)Through a lot of reading relevant literature both at home and abroad, and the warm (cold) drainage outlet of the research status and research progress of related numerical simulation and so on have a comprehensive understanding and reference for cooling water discharge standards in cold water discharge standards.(2) Some intake-outlet methods such as differential method, march-past method and eclipsed form method these three layout scheme of water intakes and advantages and disadvantages in theory.(3)Taking the flow field simulation of yingkou LNG project,this paper introduces the MIKE21FM control equation and numerical solution method.MIKE 21 FM model application model construction process of yingkou xianren island waters, the hydrodynamic module of LNG project of Yingkou island sea project terrain were calculated tidal current field, the simulated values were compared with the measured data, the simulation of the neap tide, the velocity and direction of the value of a good fit with the the measured values, so the result of MIKE21FM model can well describe the project area of tidal motion state, can be very good to show the motion law of the sea in the actual flow field, can be used as a basis of further study.(4)Through the simulation are in good value engineering after the trend movement rules, according to the numerical simulation results and engineering on the basis of the selected project and layout design of 2 kinds of drainage outlet arrangement scheme, analysis of variation of diffusion of cooling water under different project conditions and with the tide analysis of the influence of time; the project initial stage and long-term stage of intake and outfall. Then according to the different outlet on the marine environment and the influence of water intake, the final choice of scheme 2.In this paper, through the study of yingkou LNG cold outfall project site, the use of MIK.E21FM can well reflect the state of the project before the hydrodynamic and drainage engineering and the temperature drop in the envelope, and provides a theoretical basis for the protection of the marine environment and Engineering in waters near the safe and economic operation of the project.