Low-flow-resistance rotor for reinforcing heat transfer and scale removal/prevention in heat exchange tube

Abstract

The invention relates to a low-flow-resistance rotor for reinforcing heat transfer and scale removal / prevention in a heat exchange tube, which mainly comprises a hollow shaft and helical blades, wherein the hollow shaft is provided with the two or more helical blades; the helical blades are equantly arranged along the axial and circumferential direction of the hollow shaft; the helical blades have smooth surfaces, and the external diameter is slightly smaller than the internal diameter of the heat exchange tube; and the thickness of the helical blades is kept constant, and the width gradually decreases from the hollow shaft. When the fluid in the tube enters the heat exchange tube, the acting force of the fluid perpendicular to the radial direction of the helical blades enables the rotor to rotate around the hollow shaft, and the fluid in the tube forms a three-dimensional helical flow state to reinforce the turbulent intensity of the fluid and aggravate the disturbance of the boundary layer, thereby enhancing the heat transfer efficiency, improving the on-line cleaning effect, reducing the deposition of the dirt on the internal wall of the heat exchange tube and prolonging the service life of the heat exchange tube and rotor. The rotor has the advantages of simple structure, low flow resistance and high safety and reliability, and is convenient for mounting.

Description

technical field [0001] The invention relates to an insert element for enhancing heat transfer and anti-scaling and descaling in a heat exchange tube, in particular to a low-flow-resistance rotor that utilizes the heat transfer fluid inside the heat exchange tube as power to realize enhanced heat transfer and anti-scaling and descaling . Background technique [0002] Shell-and-tube heat exchangers are widely used in thermal power, nuclear power, petroleum, chemical industry, metallurgy, food, light industry, ship power, aerospace and other fields. Problems lead to a significant reduction in the heat transfer efficiency in the tube, making the heat transfer performance worse, and at the same time, the fluid delivery resistance increases, and even the tube is severely blocked and cannot be used. [0003] Anti-scaling and descaling technology of inserts in heat exchange tubes is to place inserts in the heat exchange tubes to force the fluid in the tubes to swirl or fluctuate, t...

AI Technical Summary

Problems solved by technology

[0004] The device mentioned in the above-mentioned patent has a certain effect of anti-scaling and descaling and enhanced heat transfer, but the spiral bond is an integral rotating part, which is complicated to process and manufacture, which is likely to cause scratches on the heat exchange tube and affect the service life of the heat exchanger

The rotor in the "rotor type self-cleaning enhanced heat transfer device" has a small stress area and a small driving force, which cannot better inhibit scaling, and the heat transfer efficiency and online cleaning effect are not optimal.

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