Shell and tube heat exchanger with novel baffle plates

Abstract

The invention discloses a shell and tube heat exchanger with novel baffle plates. The shell and tube heat exchanger comprises a tube pass inlet, a tube pass outlet, a left seal head, a right seal head, a shell pass inlet, a shell pass outlet, a shell, a tube plate, tube holes, the circular baffle plate, the regular hexagon baffle plate, heat exchange tubes, semicircular small holes and a circular ring. The two baffle plates are alternately arranged in the shell. The middle of the circular baffle plate is provided with the circular ring with the diameter being 5-6 times of the outer diameter of the heat exchange tubes for passing of shell pass media. The three semicircular small holes spaced by 120 degrees are formed in an edge tube hole of the circular baffle plate, the three semicircular small holes spaced by 120 degrees are formed in a middle tube hole of the regular hexagon baffle plate, and a small part of shell pass media can flow through the semicircular small holes. According to the heat exchanger, the heat exchange performance can be improved, and meanwhile deposition of dirt on the heat exchange tube walls is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a shell-and-tube heat exchanger with a novel baffle. Background technique [0002] In shell-and-tube heat exchangers, arcuate baffles are often installed to guide the shell-side fluid and avoid short circuits. At the same time, within the allowable range of pressure drop, the fluid velocity is accelerated as much as possible to enhance the turbulence of the shell-side fluid to achieve enhanced heat transfer. the goal of. However, there are still some problems in the traditional bow-shaped baffles: ①The junction between the baffles and the shell is prone to local flow dead zones, which reduces the heat transfer efficiency and is easy to scale; ②The gap between the baffles and the shell wall There is a leakage flow between them, which not only reduces the velocity of the mainstream, but also produces a large temperature distortion, which is very unfavorable to heat transfer....

AI Technical Summary

Problems solved by technology

However, there are still some problems in the traditional bow-shaped baffles: ①The junction between the baffles and the shell is prone to local flow dead zones, which reduces the heat transfer efficiency and is easy to scale; ②The gap between the baffles and the shell wall There is a leakage flow between them, which not only reduces the velocity of the mainstream, but also produces a large temperature distortion, which is very unfavorable to heat transfer.

③ There is a gap between the outermost tube of the tube bundle and the shell, which will generate a large bypass leakage flow and reduce the effective mass flow across the tube bundle

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