Research On Enhanced Heat Transfer Mechanism Of Open Rack Vaporizer Novel Heat Transfer Tube

With the rapid development of Chinese natural gas industry, for LNG production process also put forward higher requirements.Vaporizer is the core equipment of LNG gasification station, while compared the research with developed countries there is a big difference. Especially the understand of ORV heat transfer mechanism is still shallow, and all key equipments are imported.So it is necessary to in-depth study on enhanced heat transfer mechanism of ORV, and develop a new type of domestic vaporizer in order to get rid of dependence on foreign technology and contractors.Based on the traditional structure of the existing SuperORV, we design a new type of SuperORV, that add a phillips screw spoiler lever to the inner tube of the traditional vaporizer heat transfer tube. It is found that not only can enhance the turbulence intensity of the fluid.but also effectively reduce the boundary layer thickness.a strong secondary flow,strengthen the fluid in the radial heat exchange and improve the heat transfer capacity of the heat transfer tube.In this paper, it analyses the different factors(pitch, pressure, material) that affect heat transfer effects by numerical simulation.The results showed that:compared with the currently existing SuperORV, the spoiler lever in the new type of heat transfer tubes, not only increases the heat transfer area, but also improve the turbulence intensity of the fluid, effectively destroyed the temperature boundary layer and improve the capacity of overall heat transfer.At the same Reynolds number (Re).the average temperature of the fluid inside the new heat transfer tube is significantly higher than temperature of the fluid in the general transfer tube. When the pressure is 5MPa, and the Reynolds number is 6000,the turbulence of the fluid decreases inside the tube and the average temperature of the fluid decreases at the outlet with the increase of the pitch.At the same Reynolds number and pitch/the temperature of the fluid in the new heat pipe decreases with increasing pressure,and the heat transfer coefficient and Nusselt number decreases with it. With increasing Reynolds number,Nusselt number of new heat transfer tube increases gradually, and the Nusselt number and heat transfer coefficient is maximum use of copper When successively using stainless steel, aluminum, copper. Finally,experiment in the literature is simulated and compares the effects of different heat flux on heat transfer under the same mass flow rate.Obtains the same conclusion with the experimental results in the literature validates numerical simulation of reliability and validity.The results of this study provide theoretical basis for SuperORV to achieve domestic, and which had an outstanding significance for realization of independent research and development domestic vaporizer.