Heat Transfer Performance Calculation Of Heat Transfer Tube In LNG Vaporizer SuperORV

With the rapid growth of the demand for natural gas in our country,natural gas supply and demand growing,the domestic natural gas production can not meet consumer demand,the foreign dependency increasing year by year,so our LNG(Liquid Natural Gas,referred to as LNG)industry will face huge challenge.Vaporizer is the core of LNG gasification station and receiving terminal,but China has built LNG terminals used for the vaporizer are imported,expensive and long purchase cycle,severely controlled by others.LNG vaporizer SuperORV is studied in this paper,a distributed parameter model based on energy conservation is established which used for predicting the heat transfer performance of SuperORV heat transfer tube,and different discrete equations sets are used to describe the heat transfer processes in both vaporizing section and heating section with or without ice layer presence.The heat transfer performance of SuperORV heat transfer tube is calculated numerically by calculation procedures which developed on the basis of the model,obtained the distribution curve of bulk fluid and tube wall temperature and convective heat transfer coefficient,and analysis the effects of the operating parameters and heat transfer enhancement measures on its heat transfer characteristics.The results show that the required minimum tube length while both inner fins and twisted tape insert are applied can significantly improve heat transfer efficiency of the heat transfer performance of SuperORV heat transfer tube.By comparing with the experimental data under the same conditions,it is found that most of the calculated results are in good agreement with the experimental data,which verifies the accuracy of the proposed model.And found that the required for heat transfer tube of the minimum size is shortened obviously under supercritical pressure.The research method and the conclusions used in this paper can provide technical support and theoretical basis for the design and the operation regulation process of the LNG vaporizer SuperORV,and has important academic significance and engineering value.