Radial asymmetric blade combined rotor in heat exchange tube

Abstract

The invention provides a radial asymmetric blade combined rotor in a heat exchange tube. The radial asymmetric blade combined rotor consists of a hollow shaft, a main blade and an auxiliary blade; the main blade and the auxiliary blade are fixed on the outer surface of the hollow shaft; the distance from the axis of the hollow shaft to the outer edge of the main blade of the rotor is equal to theinner radius of the heat exchange tube, and the distance from the axis of the hollow shaft to the outer edge of the auxiliary blade of the rotor is smaller than the distance from the axis of the hollow shaft to the outer edge of the main blade of the rotor; the rotor, hangers and a rotating shaft are arranged in the heat exchange tube; the hangers are fixed at two ends of the heat exchange tube; both ends of the rotating shaft are axially fixed by the hangers; and the rotor is inserted into the rotating shaft through the hollow shaft of the rotor. In the radial asymmetric blade combined rotorin the heat exchange tube, the main blade and the auxiliary blade are pushed by a fluid in the heat exchange tube, so the main blade mainly plays a role in breaking the laminar flow layer of the inner wall of the heat exchange tube so as to strengthen heat conductance and prevent and remove scales, and the auxiliary blade mainly plays a role in disturbing the central fluid in the heat exchange tube; and the reduction of the radial size of the auxiliary blade is favorable for flowing of the fluid and installation of the rotor, and the material and the installation cost are saved.

Description

Technical field [0001] The invention relates to an interpolated element for enhancing heat transfer and anti-scaling and descaling in heat exchange tubes used in shell-and-tube heat exchangers, heat exchange reactors and other equipment, in particular to a heat transfer fluid in the heat exchange tube as power The self-cleaning rotor with enhanced heat transfer. Background technique [0002] In contemporary society in the 21st century, energy conservation and emission reduction is a key technology that the world attaches great importance to. It must be applied to many fields such as petroleum, chemical industry, thermal power, nuclear power, metallurgy, light industry, aerospace components, ships and vehicles. Heat exchangers, the most widely used are the shell and tube heat exchangers, but there is widespread fouling on the inner wall of these heat exchange tubes, which leads to increased fluid transport resistance in the pipeline, which can block the pipeline in severe cases, a...

AI Technical Summary

Problems solved by technology

[0002] In the contemporary society of the 21st century, energy saving and emission reduction is a key technology that the whole world attaches great importance to. The most widely used heat exchanger is the shell-and-tube heat exchanger, but the inner wall of these heat exchange tubes is generally covered with fouling, which leads to an increase in the resistance of the fluid in the pipeline, and in severe cases, the pipeline will be blocked. At the same time, the heat transfer performance is high. In order to reduce; the dirt in the heat exchange tube will seriously reduce the heat transfer efficiency and cause a major waste of energy. At the same time, the dirt is generally corrosive, and the tube wall will be corroded. The way is to be forced to stop production for cleaning, which not only delays the production progress of the factory, but also needs to pay expensive cleaning fees; Various methods and devices for decontamination

Comprehensive analysis shows that the spiral bond has the following main disadvantages: (1) the bond is a whole, which directly scratches the heat transfer tube and damages the inner wall of the heat transfer tube; (3) The service life of the bearing used for single-end fixing is short; (4) The effect of field synergy enhanced heat transfer generated by the bond is not significant

However, when a certain fluid passes through, the rotation speed of the rotor is determined by the helix angle of the flight. When the flight lead is small, the rotation speed of the rotor is too fast, and the resistance to the fluid increases accordingly; in order to solve this problem , Chinese patent application number 200620172805.5, the patent name is "low flow resistance rotor with self-cleaning and enhanced heat transfer in heat transfer tube", the device is composed of rotor, support frame and connecting axis, the support frame is fixed at both ends of the heat transfer tube, connected The two ends of the axis are respectively fixed on the support frame, and multiple rotors are mounted on the connecting axis. The rotor is composed of a hollow shaft and blades. Each blade is inclined in the same shape as the hollow shaft. Adjacent blades are connected end to end. The fluid resistance of the structure is reduced, and the fluid passing performance is good, but its rotation speed is high, and the axial force of the rotor superimposes a large force on the pendant and the shaft, and the life of the shaft will be reduced. The arrangement of the rotor blades described above is evenly distributed On the hollow shaft, in order to facilitate the installation of the rotor, there is a large distance between the outer diameter surface of the rotor and the inner diameter surface of the heat exchange tube, so that the enhanced heat transfer and anti-scaling and descaling capabilities of the rotor are limited to a certain extent

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