Composite sleeve double-helix heat exchanger

Abstract

The invention relates to a composite sleeve double-helix heat exchanger. At present, a plate type heat exchanger has high coefficient of heat transfer but can bear lower working pressure; a pipe shelltype heat exchanger is of a pressure-resisting structure but has very low coefficient of heat transfer; and a pipe type heat exchanger is formed by a single heat exchanging pipe or a heat exchange pipe bundle and has low heat transfer rate due to thick viscous flow layer of liquid inside the pipe and poor circulation state due to very low flow rate of liquid outside the pipe. In a double-helix three-sleeve heat exchanging pipe bundle of the composite sleeve double-helix heat exchanger, a middle pipe and a hollow inner pipe form an inner flow passage; inner helical blades are arranged in an annular gap of the middle pipe and the inner pipe; an outer pipe and the middle pipe form an outer flow passage; outer helical blades with opposite handedness with the inner helical blades are arranged in an annular gap of the middle pipe and the outer pipe; and two-phase liquid fast forms an annular lamella in the pipe to flow forwards in a helical scouring way. The structure not only has strong structure, but also can greatly improve the heat-transfer characteristic of the heat exchanger.

Description

Technical field: [0001] The invention relates to a chemical unit operation equipment, more specifically, it is a new shell-and-tube heat exchanger with outer, middle and inner three-layer composite sleeves and countercurrent reverse double helix structure. Background technique: [0002] At present, 90% of heat exchangers are shell and tube heat exchangers, followed by plate heat exchangers, etc. This is because most of the industrial occasions are high temperature and high pressure. A plate heat exchanger with a heat transfer coefficient as high as 2-3 times that of a shell-and-tube heat exchanger can withstand a lower working pressure of only 2-3.5 MPa. In a shell-and-tube heat exchanger, the heat exchange tube bundle is a circle The tube and the shell are cylinders, both of which are pressure-resistant structures, and the equipment can reach a working pressure of 30-35MPa. People have tried to improve the structure of the plate heat exchanger to withstand high pressure, b...

AI Technical Summary

Problems solved by technology

At present, it is recognized that the most advanced pseudo-helical baffle heat exchanger has limited improvement on the shell side circulation. Even if the full spiral manufacturing is technically realized or the shell side is divided into several small full spirals that are slightly easier to manufacture, it has not yet been realized. Essentially solve the state of low flow rate, that is, fail to essentially solve the problem of poor fluid circulation

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