Low driving force self-cleaning and heat transfer enhancement rotor in heat exchange tube

Abstract

The invention provides a low driving force self-cleaning and heat transfer enhancement rotor in a heat exchange tube, which is particularly suitable for the heat transfer enhancement of a viscous fluid of the tube side. The rotor comprises a hollow cylinder and blades, wherein each blade is of a spiral structure; the root part of the outer surface of the blade is tangential with the edge of the hollow cylinder; and when a fluid axially enters from the heat exchange pipe, the acting force of the fluid vertical to the radial direction of the blade enables the rotor to rotate around a rotary shaft. According to the invention, as the root part of the blade is tangential with the edge of the hollow cylinder, the acting area of the fluid on the blade is increased. The larger the radius of the hollow cylinder is, the more obvious the effect becomes. Consequently, if the rotation driving force applied to the rotor is increased, the rotor is more favorable for the heat transfer enhancement in the case of relatively large viscosity of a medium in the heat exchange pipe or low kinetic energy of the fluid. As the outer surface of the root part of the rotor is tangential with the edge of the hollow cylinder to form a smooth curve, the outer surface of the blade does not scale easily, thereby prolonging the using period of the entire device and reducing the cleaning frequency.

Description

Technical field: [0001] The invention relates to an interpolation element for enhancing heat transfer and self-cleaning in heat exchange tubes of shell and tube heat exchangers, heat exchange reactors, condensers and other equipment. The element can be widely used in shell-and-tube heat exchange equipment and reaction equipment in thermal power generation, petrochemical, food, pharmaceutical, light industry, metallurgy, shipbuilding and other industries, especially for enhanced heat transfer with fluid kinetic energy in the heat transfer tube as power with self-cleaning unit. Background technique: [0002] Scaling on the inner wall of the heat exchange tube of the shell-and-tube heat exchanger will lead to a decrease in heat transfer efficiency, an increase in fluid flow resistance, and in severe cases, the tube will be blocked. [0003] In the existing method, the spiral bond uses the kinetic energy of the fluid as the driving force to realize its own rotation, so as to ac...

AI Technical Summary

Problems solved by technology

However, the spiral bond is a one-piece rotating part. If the bond is not straight during processing or the heat exchange tube is not straight enough after expansion, it will affect the rotation of the entire bond and severely scratch the heat exchange tube; the torque that drives the bond when the fluid flows It is also very large, causing unnecessary energy loss; the life of the pin shaft fixed at one end is very short, and the overall field synergy enhanced heat transfer effect generated by the bond is not significant

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