Study On Numerical Simulation And Heat Transfer Calculation Of Super Open Rack Vaporizer

China's new energy consumption pattern is taking shape,and LNG demand will continue to grow in the next decade,so the key gasification link of LNG is very important.In this paper,numerical simulation research and heat transfer calculation research are carried out on the widely used Super Open Rack Vaporizer.The numerical simulation of heat transfer process of single phase flow in complex channel of heat transfer tube of Super Open Rack Vaporizer is carried out by using the software simulation method.According to the simulation results,the heat transfer characteristics of the tube in the gasification section and the tube in the heating section under the combined action of various heat transfer enhancement measures are analyzed.The results show that the same characteristic of the two parts of the tube is that the heat transfer capacity will increase with the decrease of the guide of the spoiler rod in the tube;The spoiler rod of the tube in the gasification section can be regarded as the extension of the wall,which can enhance the heat transfer.However,when the inlet flow rate is too high,the excessive cooling of the spoiler rod will have a negative effect on the enhancement of the heat transfer capacity;The petal shaped channel in the heating section will enhance the heat transfer by increasing the heat transfer area,and the low-speed flow of high-temperature fluid in the petal shaped annulus will hinder the heat transfer,which can be alleviated by the introduction of the spoiler.Based on the quantitative study of the simulated heat transfer characteristic number,the equations of heat transfer characteristic number with respect to flow characteristic number and size characteristic number are established.Based on the theory of flow boiling heat transfer,the theory of falling film heat transfer outside the tube,the actual operation data of the Super Open Rack Vaporizer and heat transfer characteristic number equation of single phase flow in complex channel of heat transfer tube,a more accurate heat transfer calculation model is obtained by improving the heat transfer calculation model of the Super Open Rack Vaporizer proposed by previous scholars.By redesigning the solution scheme,a more accurate solution program for the heat transfer model of the Super Open Rack Vaporizer is obtained.Combined with the actual operation data and design conditions,through the calculation results of heat transfer calculation model,the influence rules of the parameters such as the guide of the spoiler rod,the length of the seawater film outside the tube,the operating pressure inside the tube,the seawater inlet temperature and the seawater LNG flow ratio on the temperature distribution,the heat transfer coefficient,the icing outside the tube and the required minimum tube length of the heat transfer tube of the Super Open Rack Vaporizer are analyzed and studied.The results show that:within the set operating conditions,the decrease of the guide of the spoiler rod,the increase of seawater film length,the increase of seawater inlet temperature,the increase of operating pressure in the tube and the increase of seawater LNG flow ratio are beneficial to the heat transfer of heat transfer tube and the gasification of LNG.The heat transfer performance of the heat transfer tube represents the heat transfer performance of the Super Open Rack Vaporizer formed by its combination.In this paper,the analysis of the heat transfer characteristics of the heat transfer tube of the Super Open Rack Vaporizer,the improvement of the heat transfer calculation model of the heat transfer tube and the research on the calculation results of the actual operation conditions can provide theoretical reference for the optimal design and operation of the Super Open Rack Vaporizer,and has a certain engineering application value.