Study Of Heat Transfer Process Of LNG Intermediate Fluid Vaporizer Applied To FSRU

To impel and realize the localization of LNG-FSRU regasification model, this thesis compared varies vaporizers. Considering the specific using environment and present manufacturing technology, it is decided to adopt Intermediate fluid vaporizer(IFV). HYSYS is used to simulate the heat transfer process inside IFV. Proper heat transfer calculation models were chosen for different vaporizers to calculate. After comparisons of combined IFV and divided IFV, the structure and parameters of IFV was finally determined, it was believed that combined IFV should suit the requirement for FSRU as vaporization equipment.Experimental scheme was designed according to some important issues like safety, operability and economic factors. There is detailed description of components used in the experiment and how the test rig was built. The thesis shows how the experimental data was processed and how the uncertainty degree of the experiment was analyzed so that the experimental data can be used as reference to study the heat transfer performance of water and propane.Firstly, several confirmatory tests were done to carry out error analysis. Heat transfer experimental results of propane and water in vaporization experiment casing and propane and nitrogen in condensation experiment casing were analyzed.The heat transfer coefficient on water side increases with the increase of water velocity, water inlet temperature, and as the increase of oblique angle, the acceleration goes smaller. Compared with prediction value from D-B equation, the tendency was the same and showed great agreement whose deviation was less than 10%.With the increase of heat flux, the boiling heat transfer coefficient of propane increases and the tendency goes gentle. The boiling heat transfer coefficient is bigger in declining tubes. The experimental results show the same trend with prediction results from Cooper equation, with 30% of deviation.With the increase of wall subcooling, the condensation heat transfer coefficient of propane decreases and the tendency becomes gentle. The condensation heat transfer coefficient of propane is slightly bigger in declining tubes. The experimental results show the same trend with prediction results from Nusseltequation with 40% of deviation.