An axisymmetric cross-finned heat exchange tube

Abstract

An axisymmetric cross-finned enhanced heat exchange tube, including a plurality of unit tubes arranged at intervals and rotating unit tubes, the rotating unit tubes are formed by rotating the unit tubes at a preset angle, and the unit tubes are rotated along the axis There are many pairs of upper and lower opposite fins and wide fins penetrating the cross-section of the heat exchange tube integrally connected with the side wall of the unit tube, the wide fins are located on the left and right sides of the unit tube, and the plurality of pairs The fins are located between the wide fins on the left and right sides, and each pair of up and down relative fins is axisymmetric, and the distance between the tops of each pair of fin plates is a preset distance L3; the wide fins and the fins ( Extending in the axial direction but not completely penetrating, so that there is a smooth segment L1 and an inner fin segment L2 with a preset length in the unit tube and the rotating unit tube; the heat exchange tube of the present invention can not only increase the condensation temperature for occasions with condensation phase heat transfer The wall surface for heat exchange, and greatly reduces the thickness of the non-condensable gas boundary layer, increasing the condensation heat transfer coefficient.

Description

technical field [0001] The invention belongs to the technical field of heat exchange tubes, and relates to a unit structure of a heat exchanger, in particular to an axisymmetric intersecting fin reinforced heat exchange tube. Background technique [0002] Heat exchangers are widely used in various industries of the national economy, and are one of the most common equipment in energy, petroleum, chemical, metallurgy, power, light industry, food and even aerospace industries. It is not only widely used equipment to ensure process flow and conditions, but also an important equipment to develop secondary energy, realize heat recovery and save energy consumption. The development and design of advanced enhanced heat exchange tubes and the rational design, operation and improvement of heat exchange equipment are very important to save metal, energy, money and space. [0003] Adding inner fins to the heat exchange tube can not only increase the heat exchange area to a certain exten...

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Problems solved by technology

[0007] 1. It is impossible to maximize the uniformity of the cross-sectional temperature field

The inner fin structure makes the high-temperature flue gas flow through the entire heat exchange tube only through fixed channels, and the heat exchange between high-temperature flue gas in different channels is less, especially the finless area in the center of the pipe is still a high-temperature air flow area, which cannot Maximize the uniformity of the cross-sectional temperature field

[0008] 2. It is difficult to ensure sealing and good contact with the outer tube

The inner fin tube is made of two half-shells plugged together, it is difficult to ensure the seal, so it must be used with the outer tube, and there is a problem of poor contact with the outer tube, which greatly reduces the heat exchange effect

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