Axial symmetry type cross inner-fin heat transfer enhanced tube

Abstract

An axial symmetry type cross inner-fin heat transfer enhanced tube comprises a plurality of unit tubes and rotating unit tubes. The unit tubes and the rotating unit tubes are spaced. The unit tubes rotate in preset angles to form the rotating unit tubes. A plurality of fin pairs vertically relative and wide fins penetrating the section of the heat transfer tube are axially integrally connected with the inside of each unit tube. The wide fins are arranged on the lefts and the rights of the unit tubes. The fin pairs are arranged between the lateral wide fins and in axial symmetry. The distance of the tops of every fin pair is a preset distance L3. The wide fins and the fins extend axially without thorough penetration, allowing smooth segments L1 and inner fin segments L2 to be preserved with preset lengths in the unit tubes and the rotating unit tubes; the heat transfer tube has the advantages that under condensed phase-change heat transfer condition, condensation heat transferred wall surfaces are added, boundary layer thickness of noncondensing air is greatly slimmed, and condensation heat transfer coefficient is increased.

Description

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

AI Technical Summary

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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