Compact type gas-gas heat exchange tube and manufacturing and use methods thereof

Abstract

The invention provides a compact type gas-gas heat exchange tube which comprises a heat transfer tube, an inner fin set and an outer fin set. The heat transfer tube is used for separating fluid insideand outside the tube and transferring heat between the fluid inside and outside the tube in a convection heat conduction mode; the inner fin set is used for expanding the inside heat exchange surfaceof the heat transfer tube, forming miniature fluid channels, separating the fluid in the tube, making the fluid flow in the axial direction of the heat transfer tube and meanwhile generating a turbulent flow effect and enhancing a convection heat exchange effect; the outer fin set is used for expanding the outside heat exchange surface of the heat transfer tube, forming miniature fluid channels,restraining the fluid outside the tube to reversely flow in the axial direction of the heat transfer tube and meanwhile generating the turbulent flow effect and enhancing the convection heat exchangeeffect; and holes are formed in fins of the inner fin set or / and the outer fin set. The invention further provides manufacturing and use methods of the compact type gas-gas heat exchange tube. Complete reverse flow efficient heat transfer is achieved under the heat exchange working condition of the limited space and the small tube number average temperature difference, the equipment spatial size is reduced, and meanwhile the weight of each area is reduced, so that the total weight and the manufacturing cost are reduced.

Description

technical field [0001] The invention relates to a heat exchange tube for heat transfer, which belongs to the technical field of high-efficiency and compact heat exchangers. Background technique [0002] In recent years, the new power cycle power generation technology has developed rapidly, and cycle power generation systems using helium, hydrogen, carbon dioxide, organic compounds, etc. New application fields such as fourth-generation nuclear power, solar thermal power generation, and ships are being developed based on supercritical carbon dioxide Brayton cycle power generation technology, such as figure 1 shown. The carbon dioxide working medium in the circulation loop is in a supercritical state, and the convective heat transfer characteristics are similar to those of a high-pressure gas-gas heat exchanger. [0003] In all kinds of industrial heat exchangers, heat transfer tubes are the basic heat exchange devices, widely used in shell-and-tube heat exchangers, tube-shee...

AI Technical Summary

Problems solved by technology

However, if the conventional heat transfer tube is used in a supercritical carbon dioxide circulation device in the form of a bare tube, the heat exchange area will be very large, and it cannot achieve efficient heat exchange in a limited space, nor can it meet the requirements of a supercritical carbon dioxide circulation device. Requirements for efficiency and volume

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