Simulation Study On The Heat Transfer Performance Of The Longitudinal Finned Tube Of The New Air-heated Vaporizer

Among the three fossil energy sources,natural gas has attracted much attention as a relatively clean and green energy.In the use of natural gas,the vaporizer is an essential equipment,and the air-temperature gasifier is the most environmentally friendly gasifier among many gasifiers,which has positive research significance.In this paper,a new type of air-temperature gasifier with a single longitudinal finned tube is used as the research object,and the Realizable k-e turbulence model and the Mixture multiphase flow model are used to simulate the heat transfer performance of LNG in the new longitudinal finned tube.The influence of multiple factors such as pressure,inlet flow rate,air temperature,and air flow rate.The Refprop software developed by NIST is used to calculate the thermophysical properties of LNG,NG and dry air,and Origin is used to analyze the data.Fitted to obtain curve diagrams and multiple fitting formulas,established a three-dimensional spatial model through SCDM and Solidworks,performed mesh division and by Meshing to check on the quality,then set homologous parameters simulating,obtained the simulation's consequence about LNG changes.The cloud map of temperature distribution and cloud map of velocity distribution of new vertical fin tube in ambient air vaporizer were analyzed,and the variation of LNG's temperature along the tube-side direction of the longitudinal finned tube was obtained.The traditional air-temperature gasifier finned tube model is established for simulation comparison and analysis,and the field synergy principle is used to analyze,and it is concluded that the new finned tube has certain advantages.By changing the operating conditions:operating pressure,inlet flow rate,air temperature and air flow rate,the simulation of different working conditions is analyzed,and the outlet temperature is analyzed.It is obtained: the larger the operating pressure,the substance's outlet temperature is higher;The bigger the import flow velocity,the substance's temperature lower;the bigger the air temperature,the higher the fluid's outlet temperature;the larger the air velocity,the higher the fluid's outlet temperature.The research results of this paper provide a certain theoretical basis for the improvement of vaporizer efficiency of ambient air vaporizer in the future.