Multiple shell passes shell-and-tube helica-baffle heat exchangers

Abstract

The multiple shell spiral baffle shell-and-tube heat exchanger includes one shell, one central tube in the center oft shell, two tube plates on ends of the shell and with separate end covers, one inlet pipe and one outlet pipe beside the tube, one heat exchange tube bundle, one inlet pipe and one outlet pipe beside the shell, one external spiral baffle plate and one internal spiral baffle plate, and one internal casing between the external spiral baffle plate and the internal spiral baffle plate. The shell, the external spiral baffle plate and the internal casing enclose one external spiral shell pass; and the internal casing, the internal spiral baffle plate and the central tube enclose one internal spiral shell pass, so that one two-shell pass spiral baffle plate shell-and-tube heat exchanger is formed. Adopting two or more internal casings can form multiple spiral shell pass. The present invention has raised heat exchange efficiency, compact heat exchanger structure, less vibration, high safety, less scaling and long service life.

Description

technical field [0001] The invention relates to a shell-and-tube heat exchanger used in oil refining, chemical industry, environmental protection, energy, electric power and other industries, in particular to a shell-and-tube heat exchanger with multi-shell side spiral baffles. Background technique [0002] Heat exchanger is an important unit equipment in oil refining, chemical industry, environmental protection, energy, electric power and other industries, and shell and tube heat exchanger is the most widely used. 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 tube walls. At the same time, baffles are arranged on the shell side, and the baffles provide support for the tubes, and also make the fluid flow in specific channels to improve its heat transfer characteristics. [0003] There are many problems in the traditional bow-shaped baffles: ①The bow-shaped baffles cause the flui...

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; ③There 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

But in fact, the flow rate of the shell-side fluid is often low; or due to process requirements, the shell-side fluid needs to be arranged as a multi-shell type

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