Enhanced heat transfer unit of self-drive periodically brushing boundary layer fracture in heat exchange tube

Abstract

An enhanced heat transfer unit of self-driven periodically brushing boundary layer fracture in a heat exchange tube is characterized in that: two ends of a smooth heat exchange tube or a straight tube section are respectively provided with an impeller, the two impellers are respectively fixed with a flange, an inner end face is located in the smooth heat exchange tube or a central axis of the straight tube section, which is in expansion joint or in spiral connection with a stainless steel metal shaft, the metal shaft is thereon connected with periodic boundary layer brushes at intervals and at random. The periodic boundary layer brushes are all vertical to the stainless steel metal shaft which can be a short metal pin and stick welded on the metal shaft or an organic plastic short stick or a perforated metal sheet. The end of each periodic boundary layer brush is at a distance of 1/5-1/7 semidiameter away from the internal face of the heat exchange tube. The invention adopts the impeller fluid self-drive method, the fluid drives the impeller to ensure that the boundary layer brushes rotate without external power; the rotation of the boundary layer brushes ensures that fluid in the tube perturbs so as to enhance heat transfer, and the boundary layer inside tube wall is gradually destroyed, thus further improving enhancement effect and avoiding scaling in the internal tube wall.

Description

technical field [0001] The invention relates to a heat transfer enhancement device for a heat exchange tube, in particular to a heat transfer enhancement device for self-driven periodic brush boundary layer rupture in a heat exchange tube. Background technique [0002] Shell and tube heat exchangers play an important role in process industrial systems such as chemical industry, oil refining, light industry, and metallurgy. According to statistics, in modern petrochemical production, especially in the auxiliary equipment of large-scale power stations, the investment in shell-and-tube heat exchangers and heat exchange pipes accounts for about 15% to 30% of the total investment. However, compared with various new high-efficiency heat exchangers, the commonly used shell-and-tube heat exchangers have lower heat exchange efficiency. Therefore, with the increasing shortage of energy, in line with the idea of ​​saving energy and material consumption, it is the pursuit of every engi...

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Problems solved by technology

[0007] The invention discloses a device for enhancing heat transfer by self-driven periodical brush boundary layer rupture in a heat exchange tube. The purpose of the device is to ov

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