The Heat Flow Field of the Intermediate Heating Medium inside of the Cylinder Type Natural Gas Heater

摘要

The cylinder type natural gas heater with intermediate heating medium has been most widely used in gas industry. Therefore, the present paper explores the structural characteristics and the heat transfer mechanism inside of the cylinder. According to the distinctive heat transfer structure of the cylinder type natural gas heater, the natural convection heat transfer model of both heating surfaces and cooling surfaces in the cylinder is built. The unstructured Cartesian grid finite method is employed and thus these grids are fully body fitted. The temperature distribution and velocity vector inside the cylindrical natural gas heater are numerically simulated. The simulation results show that the conventional symmetrical arrangement of heating and cooling surfaces is not conducive to the formation of an effective heat flow field. An effective measure of rotating the symmetrical layout structure at a certain angle is put forward creatively, which can optimize the overall heat transfer effect of the heater. Analysis and comparison of the heat flow field of the cylindrical natural gas heater in different rotation angle are carried out. The numerical simulation shows the best rotation angle is 20～30°. The technology has got itself the China invention patent.