(1) The built-in liquid-absorbing core used is a multi-pore stainless steel strip, which is wound into a cylindrical shape and then clings to the air wall of the finned tube. When the heat-absorbing core is immersed in liquefied petroleum gas or natural gas liquid, due to the liquid surface tension capillary The effect of the phenomenon, the liquid in the liquid film is adsorbed in the narrow gap between the liquid-absorbing core and the inner wall of the finned tube, and the liquid in the liquid film absorbs heat and vaporizes to form tiny bubbles. When the tiny bubbles move to form larger bubbles, the suction The small holes on the upper surface of the liquid core escape, the liquid surface breaks away into gas and boils, and after the tiny bubbles leave the liquid-absorbing core, the liquid is replenished into the gap by the small holes on the liquid-absorbing core to form micro-convection heat transfer and due to the built-in liquid-absorbing core The liquid is isolated from the spiral guide belt, so as not to be carried by the latter and leave the finned tube prematurely, which is beneficial to the generation of tiny air bubbles.
(2) The built-in spiral guide changes the flow direction of the liquid. When there is no built-in spiral guide belt, the liquid flow direction is vertical flow, but after the built-in spiral guide belt, the liquid flow direction is spiral upward (the flow direction is similar to that of A Kimedes spiral), which increases the liquid flow, increases the contact time between the liquid and the finned tube, improves the separation of the liquid between the liquid-absorbing core and the spiral guide belt, and forms an airflow, which entrains a small part The liquid droplets continuously wet the fin wall above the liquid surface during the rising process, and the gas absorbs a part of the liquid droplets with the same temperature as the rising airflow and flows downward along the inner wall. After the liquid surface is mixed with the liquid at a slightly lower temperature, The temperature at the liquid surface is increased, the boiling inside the finned tube is enhanced, and the overall heat transfer performance of the finned tube is also improved. For the application of these two technologies, the uniformity of the temperature on the inner wall of the finned tube is optimized, and the heat density and finned tube are further improved. The heat transfer coefficient of the sheet tube improves the heat exchange effect of the air-temperature vaporizer and ensures the gasification of liquefied LPG and LNG.
The gasification section consists of a heat exchange tube with a built-in liquid-absorbing core and a spiral-guided finned tube, and a superheating section with a built-in spiral-guided finned tube (used to increase the temperature of the gas after gasification) ) and the air-temperature vaporizer composed of the main pressure regulating device, the control device for monitoring the liquid-phase pressure regulator, the gas-phase pressure regulating system, the anti-liquid device, and the release pipe, etc., can guarantee a certain volume. gasification capacity.
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