Shell and tube type heat exchanger with sharply enlarged accelerated flow zooming tube bundle and hollow ring

Abstract

The heat exchanger consists of three sections of annular shell pass inlet section, axial flow section and annular shell pass outlet section; and includes mainly shell, hollow annular web plate, shell pass inlet gas flow distributing plate, abruptly expanding accelerated flow contracting-expanding tube bundle, shell pass fluid inlet and outlet, upper and lower tube plates, annular gas inlet and outlet sleeve, gas inlet and outlet slots, upper and lower end covers and support. It has abruptly expanding accelerated flow contracting-expanding tubes as heat transferring tubes and hollow annular web plate as support article between tubes, has the advantages of high heat transfer coefficient, small fluid resistance, less apparatus material consumption, low cost, etc., and is suitable for low density, great volume flow rate and deep heat exchange.

Description

technical field [0001] The invention belongs to the technical field of heat transfer enhancement, and relates to a hollow-ring shell-and-tube heat exchanger of rapid expansion and rapid flow scaling tube bundles. Background technique [0002] In terms of the structure of the support between the tubes, the existing heat exchangers mainly include single-bow baffles, double-bow baffles, disc-ring baffles, etc. The heat exchangers currently used in industry are single-bow baffles There are many structures supporting tube bundles with baffle baffles, the main disadvantage of which is the large resistance of the fluid shape caused by baffles; in terms of heat transfer tube structure, there are mainly zoom tubes, but the existing zoom tubes have shortcomings: due to their The fluid flow in the expansion deceleration section has the effect of weakening the heat transfer, while the fluid flow in the contraction acceleration section has the effect of strength...

AI Technical Summary

Problems solved by technology

[0002] In terms of the structure of the support between the tubes, the existing heat exchangers mainly include single-bow baffles, double-bow baffles, disc-ring baffles, etc. At present, the heat exchangers used in industry are single-bow There are many structures supporting tube bundles with baffles, the main disadvantage of which is that the resistance of the fluid body caused by baffles is large; in terms of heat transfer tube structure, there are mainly zoom tubes, but the existing zoom tubes have shortcomings: due to their The fluid flow in the expansion deceleration section has the effect of weakening the heat transfer, while the fluid flow in the contraction acceleration section has the effect of strengthening the heat transfer. The structure of the existing zoom tube is that the ratio of the length of the expansion tube section to the contraction tube section to the pitch of the zoom section is 1:1~1:2, due to the larger proportion of the expansion section, the weakening effect of heat transfer is more obvious when the fluid flows, resulting in insufficient overall enhanced heat transfer efficiency

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