Longitudinal spiral inner fin tube

Abstract

The invention discloses a longitudinal spiral inner fin tube, which comprises an outer tube and a core tube sleeved concentrically and an inner fin nested and wound around the tube core in a circumambient way between the outer tube and the core tube, wherein the inner fin is connected with the outer tube and the core tube by adopting a braze welding way, the inner fin is formed by bending a corrugated inner fin plate and a cylindrical shape longitudinal spiral inner fin tube is formed between the outer tube and the core tube, and a plurality of longitudinal spiral type circulating passages are distributed on the longitudinal spiral type inner fin tube; the included angle between the corrugation texture of the corrugated inner fin plate and the horizontal direction is Alpha, wherein Alpha is larger than or equal to 15 degrees and lower than or equal to 85 degrees; the corrugation shape of the corrugation adopts continuous periodic functions, and the longitudinal amplitude height H is equal to the spacing between the outer tube and the core tube; the greater viscosity of the medium circulated in the inner fin is, the sparser the corrugation, the longer the corrugation wavelength Lambada, the less amount of the longitudinal spiral type circulating passages, and the greater the degree of Alpha; the reverse is also true. The structure of the longitudinal spiral inner fin tube is simple and the machining and fabrication is simple and convenient, the heat transfer area in the tube can be effectively increased, and simultaneously the flow resistance in the tube can also be effectively reduced.

Description

technical field [0001] The invention relates to an enhanced heat transfer element used in heat exchange equipment in oil refining, chemical industry, environmental protection, energy, electric power and other industries, in particular to a longitudinal spiral inner finned tube. Background technique [0002] Heat exchanger is an important unit equipment in oil refining, chemical industry, environmental protection, energy, electric power and other industries. Usually in the construction of chemical plants, heat exchangers account for about 10-20% of the total investment; especially in refineries, Heat exchangers account for about 35-40% of all process equipment investment, of which shell-and-tube heat exchangers account for 37% of the total heat exchanger market in the world. In the shell-and-tube heat exchanger, how to achieve high efficiency and energy saving of the heat exchanger mainly focuses on how to develop new and efficient enhanced heat transfer elements and further ...

AI Technical Summary

Problems solved by technology

[0005] A comprehensive analysis of the research on corrugated inner finned tubes found that most of the research focuses on how to effectively increase the heat transfer area of ​​the fins or increase the disturbance of the longitudinal flow of the fluid. Although the heat transfer characteristics of the finned tubes are finally increased, the flow Resistance is also significantly increased

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