Vertical multiple-spiral blended flow shell-and-tube heat exchanger and method for reinforcing heat transfer

Abstract

The invention relates to a longitudinal multi-screw tubular heat exchanger, which comprises: heat exchange tube beam, frame, heat exchange tubes, and screw torsion plate, wherein the tubular plates are at two ends of frame; the heat exchange tube beam is fixed on the tubular plate; the screw torsion plates are uniformly arranged on the outer wall of each heat exchange tube; the screw torsion plate is holed screw torsion plate which has several holes distantly along its axle; the holed screw torsion plate can make longitudinal screw flow and ejection flow functions on the liquid, to make the liquid into several longitudinal screw mixed flows, to improve the flow speed on the wall of heat exchange tube beam, to fully mix the fluids at different tube parts, to improve the factor of heat conductive film.

Description

technical field [0001] The invention relates to a shell-side spiral flow shell-and-tube heat exchanger, in particular to a longitudinal multi-spiral mixed flow shell-and-tube heat exchanger and a method for enhancing heat transfer. Background technique [0002] Shell and tube heat exchanger is the most widely used heat exchange equipment. Due to the mature manufacturing process and high safety, it occupies the largest proportion of heat exchange equipment, especially in high temperature, high pressure, toxic and other harsh occasions. Shell and tube heat exchanger It has great advantages, but the shell-and-tube heat exchanger currently used still has the problem of low heat transfer efficiency. [0003] People have done a lot of research on the heat transfer enhancement in the shell-and-tube heat exchanger tube, and achieved fruitful results. In contrast, the research on the heat transfer enhancement of the shell side is far less extensive and in-depth than the tube side. A...

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Problems solved by technology

In the article "Study on Enhancing Heat Transfer of Shell-side Spiral Twisted Fins" in "Petrochemical Equipment" in Volume 29, No. 6, 2000, Liu Jipu and Wen Meichun proposed that the helical twisted fins be clamped on the horizontal grooved pipe In the shell side of the shell heat exchanger, the heat transfer of the shell side can be fully strengthened at low Re, and at the same time, the clamped spiral twisted pieces play a role of close-packed isolation and support for the tube bundle, without mutual interference, and the fluid flows along the The shell side advances axially, and there is no turning flow, which slows down the induced vibration of the shell side fluid flow on the tube bundle; however, due to the nonlinear secondary vortex generated in the shell side by the helical torsion plate, the energy of the fluid is consumed, and its The resistance changes in direct proportion to the flow velocity, so the shell-side helical twisted vane structure is only suitable for fluids flowing under medium and low Re; in addition, in the prior art, there is no fixed member to prevent bypass flow and fix the supporting helical twisted vane, because The spiral torsion piece is light in weight, and it is easy to loosen and rotate directly between the tube bundles, resulting in deformation of the torsion piece, which affects fluid flow and heat transfer; and the ring gap between the tube bundle and the cylinder is large, causing serious side leakage

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