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86 512-8166609657，anti icing design of supercooling section of lng air heated gasifier - doer equipment
classification：forum publishtime：2019-08-28 16:51:41
anti icing design of subcooling section of lng air heated gasifier
during the operation of the air temperature gasifier, when the low-temperature liquid lng enters the finned tube, the temperature of the tube wall (finned tube) decreases sharply near the inlet doer to the large temperature difference between the fluid (liquid lng) and the tube (finned tube) (nearly 170 ℃), and the water vapor in the surrounding air will quickly condense into a frost layer when it is cold. at the same time, as the fluid absorbs the heat of the pipe wall along the pipe length direction, it first passes through the supercooling section, gasification area and then to the reheating area, the temperature rises continuously, and the farther away from the inlet, the higher the temperature. in this way, the temperature difference between the pipe wall and the fluid gradually decreases, so the frosting degree and speed away from the inlet become smaller and smaller.
therefore, it can be seen that it is most likely to freeze in the supercooling section; it is not difficult to find out that the main factors affecting the frost layer thickness are: ambient temperature, ambient humidity, air flow rate and continuous working time.
the working time of gasifier is set as 8 hours, and other factors are uncertain.
on the basis of slightly increasing the cost, our company has carried out special surface treatment (forced oxidation) of aluminum materials in the supercooling section. doer to the small adhesion between the treated 8-wing and smooth fins and the frost layer, when the frost layer reaches a certain thickness, it is more conducive to the fall of the frost layer, so as to control the increase of frost layer thickness to the greatest extent, so as to prevent icing. at the same time, the treated equipment is still as white as new after long-term use. advanced special surface treatment greatly improves the service life of products, and is suitable for use in seaside and corrosive harsh environment.
therefore, it is very reasonable that the heat exchange tube (smooth 8 fin) in the supercooling section is made of aluminum alloy, and the heat exchange tube (corrugated 12 fin) in the heating and reheating section is made of 3a21
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