A drainage type insertion device in a heat exchange tube

Abstract

The invention discloses a flow-guiding plug-in device in a heat exchange tube. The flow-guiding plug-in device comprises plug-in units and a support bar, wherein each plug-in unit comprises a flow-guiding section and two horizontal flow channels, the flow-guiding section is obliquely arranged, and the two horizontal flow channels are respectively arranged at the upper end and the lower end of the flow-guiding section in the horizontal direction to form a stepped structure; the support bar is arranged in the axial direction of the heat exchange tube; each plug-in unit is mounted on the support bar through one horizontal flow channel; and the distance between each plug-in unit and the wall of the heat exchange tube is H, H is larger than 0 and smaller than or equal to 0.15D, and D is the internal diameter of the heat exchange tube. According to the flow-guiding plug-in device in the heat exchange tube, the plug-in units are arranged in a certain mode to generate longitudinal vortices under the action of turbulence, so that the resistance is not increased excessively while heat exchange is improved. The flow-guiding plug-in device in the heat exchange tube is a novel plug-in device which integrates the functions of flow guiding, turbulence and longitudinal vortex generation, and has a favorable heat transfer strengthening capability.

Description

technical field [0001] The invention belongs to the field of heat exchange tube turbulence technology and devices, and more specifically relates to a drainage type insertion device in a heat exchange tube. Background technique [0002] There are generally two types of tube-side enhanced heat transfer technologies: one is surface-based enhanced heat transfer technology, such as spiral grooved tubes, zoom tubes, corrugated tubes and other common special-shaped tubes, which are formed by different surface structures near the tube wall. The fluid is disturbed and disrupts the development of the boundary layer to achieve the purpose of enhancing heat transfer. The other is fluid-based enhanced heat transfer technology, such as twisted ribbons, worm rods, spiral coils and other common tube inserts, which disturb the fluid area by themselves, so that the temperature of the fluid area is as uniform as possible to achieve the purpose of enhancing heat transfer . The disturbance of ...

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Problems solved by technology

The fundamental purpose of disturbance is to make the temperature in the tube more uniform, so as to achieve the purpose of enhancing heat transfer. However, while the insert greatly improves the heat transfer capacity, the price paid is a large pressure drop along the way.

Therefore, the comprehensive performance of enhanced heat transfer is limited. At the same time, some inserts have a higher enhanced heat transfer capacity in theory, but are difficult to process and support in practice, so the application range is limited.

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