Shell-pipe head exchanger by double helix flowing of fluid medium in or out of heat exchange tube

Abstract

The invention discloses a shell and tube heat exchanger with fluid media duplex helicoidal flowing inside and outside a heat exchange tube, which consists of a shell sealed by an end enclosure, a shell side inlet and a shell side inlet which are arranged on the side wall of the shell, a close board A and a close board B which are arranged on two ends inside the shell, a tube side inlet and a tube side outlet which arranged on the end enclosure, a traverse baffle arranged inside the shell, and a plurality of heat exchange tubes which are arranged between the close board A and the close board B in parallel, wherein, heat exchange tube comprises an outer tube, a core tube and an inner fin which is circularly embedded between the outer tube and the core tube around the tube core; the traverse baffle is a helical traverse baffle communicating the shell side inlet and the shell side outlet; the traverse baffle, the shell side inlet and the shell side outlet form a vertical helical type shell side circulating channel; the inner fin is formed by bending a corrugated inner fin plate, and a vertical helical type inner fin tube between the outer tube and the core tube is formed; and the vertical helical type inner fin tube is communicated with the tube side inlet and the tube side outlet to form a circulating channel in tube. The invention has a simple and reasonable structure, and can decrease the occurring of low flow resistance and scale formation while strengthening the performance of heat transfer and heat exchange of shell side and tube side.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger, in particular to a shell-and-tube heat exchanger with a double-helix flow of fluid medium inside and outside a heat exchange tube. Background technique [0002] In oil refining, chemical industry, environmental protection, energy, electric power and other industries, heat exchanger is an important unit equipment. Usually in the construction of chemical plants, heat exchanger accounts for about 10-20% of the total investment; especially in refineries In construction, heat exchangers account for about 35-40% of all process equipment investment. Among them, shell-and-tube heat exchangers account for 37% of the total heat exchanger market in the world. In a shell and tube heat exchanger, one fluid flows inside the tubes and the other fluid flows on the shell side and exchanges heat through the tubes. At the same time, baffles are arranged on the shell side, and the baffles provide support for the ...

AI Technical Summary

Problems solved by technology

[0003] There are many problems in the traditional bow-shaped baffles: ①The bow-shaped baffles cause the fluid to impact the shell wall vertically, resulting in a large pressure drop along the way; , reduces the heat transfer efficiency, and is easy to scale; ③ there is leakage between the baffle and the shell wall and between the heat exchange tube and the baffle, so that there is a large bypass flow on the shell side, and the side flow And the leakage flow reduces the mass flow rate of the effective cross-sweeping tube bundle, so the heat exchange efficiency of the shell side is reduced; ④The high-velocity fluid sweeping the heat-exchange tube bundle will induce the vibration of the heat-exchange tube and shorten the life of the heat exchanger

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