Inner boundary layer cutting disturbing radial mixed flow device of heat exchange pipe

Abstract

The invention relates to an inner boundary layer cutting disturbing radial mixed flow device of a heat exchange pipe, which belongs to an inner insertion element enhanced heat transfer device of a heat exchange pipe of pipe type heat exchange equipment. The device consists of a rotor (or a plurality of rotors), pipe end hanging elements, a support shaft and position limiting rivets, wherein two pipe end hanging elements are respectively fixed at both ends of the heat exchange pipe, one or a plurality of rotors are arranged in the heat exchange pipe, the rotors can be ranged in groups, each group is separated through the position limiting rivets, the support shaft passes through shaft holes of the rotors and the position limiting rivets, and both ends of the support shaft are fixed on the pipe end hanging elements. Each rotor consists of a driving wing, a disturbing wing, a support ring and a shaft hole, the fluid in the heat exchange pipe can be divided into two parts: a driving region and a cutting disturbing region, the disturbing wings can be straight wings or spiral wings in the opposite direction to the rotating direction of the driving wings, and in addition, small gaps are formed between the pipe walls and the disturbing wings for realizing the sufficient cutting disturbing on the boundary layer of the fluid. The device per se has the double functions of on-line cleaning and enhanced heat transfer in the heat exchange pipe through the enhanced fluid boundary layer cutting disturbing and radial mixed flow effect.

Description

technical field [0001] The invention relates to an insert-insert enhanced heat transfer device used in the heat exchange tube of tubular heat exchange equipment, in particular to an on-line cleaning and enhanced heat transfer device that utilizes the fluid in the heat exchange tube to provide driving force. Background technique [0002] Scaling of heat exchange tubes in tubular heat exchangers leads to a decrease in heat transfer efficiency and an increase in fluid flow resistance, thereby increasing energy costs and production costs of the enterprise, and even forming corrosion under the scale, causing safety hazards and shortening the service life of heat exchange equipment . Cleaning and overhaul can prevent the low-cost operation of production. [0003] The enhanced heat transfer technology of inserts is popular because of its dual effects of enhanced heat transfer and online cleaning. It is widely used in tubular heat exchange equipment, and research on insert technolo...

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Problems solved by technology

[0004] However, without considering online cleaning, a large number of studies have shown that there is a large gap in the enhanced heat transfer performance of the insert technology compared with various enhanced tubes (finned tubes, corrugated tubes, horizontal grooved tubes, etc.), while other The root cause lies in the flow field distribution in the pipe

In response to this problem, the applicant used flow field visualization technology to study the flow field in a tube of an interposer (ZL 200520127121.9), and found that the helical flow in the tube is not as obvious as described in previous studies, and the interposer has no effect on the fluid The shear perturbation of the boundary layer is more insufficient

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