Toughened nonmetal composite heat exchange tube

Abstract

A toughened non-metal composite heat exchange tube comprises a non-metal base tube (1) and one or more than two layers of carbon fiber cloth (2) with meshes (3), the outer surface of the non-metal base tube is wrapped with the carbon fiber cloth (2), and the meshes on the carbon fiber cloth are aligned. On the premise that the heat exchange efficiency is not reduced, the toughness of the non-metal heat exchange tube is greatly improved, so that the compression strength in the heat exchange tube is greatly improved, and the safety and the reliability of the non-metal heat exchange tube are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pipeline structure, specifically relates to the heat exchange pipeline used in chemical industry, hydrometallurgy and other production processes. BACKGROUND

[0002] In the production process of chemical industry, hydrometallurgy and other production processes, a large number of tube type heat exchangers will be used, and for the heat exchange between the corrosive acid-containing liquid or with the steam or gas, currently, basically all graphite tubes or silicon carbide tubes are used in the tube type heat exchanger. But graphite or silicon carbide is a non-metallic material, and its toughness is poor, and it is easy to break and damage under the impact of thermal stress and mechanical stress, therefore, the safety and reliability are poor. Especially, the ability to withstand the pressure in the tube is weak, and when the pressure in the tube fluctuates greatly, it is easy to break and burst, therefore, only the acid-containing liquid or steam with small pressure can pass through the tube, and the saturated steam with large pressure cannot pass through the tube. For example, in the sulphuric acid method titanium dioxide industry, the waste acid concentration heat exchanger can only use graphite heat exchange tubes (tube side) to pass the waste acid, and the high-pressure steam passes through the shell cavity (shell side) of the heat exchanger. Because the waste acid liquid contains a lot of solid impurities, it is easy to cause fouling of the tube wall, and needs to be cleaned frequently, and the graphite tube is not only troublesome to clean, but also easy to damage the tube body, so the defect is very obvious. If the steam can pass through the heat exchange tube, the problems of fouling and cleaning can be solved. Therefore, improving the toughness of the non-metallic heat exchange tube and further improving the safety and pressure resistance of the tube are the key to solving the problem. SUMMARY

[0003] The utility model discloses a kind of toughened non-metallic composite heat exchange tubes to solve the problems existing in prior art, with good toughness, high safety and pressure resistance in tube, and good reliability.

[0004] The utility model discloses a kind of toughened non-metallic composite heat exchange tubes to solve the problems existing in prior art, with good toughness, high safety and pressure resistance in tube, and good reliability.

[0005] A kind of toughened non-metallic composite heat exchange tube, including non-metallic base pipe, a layer or more than two layers of carbon fiber cloth with mesh are wrapped in the outer surface of non-metallic base pipe, and the mesh on each layer of carbon fiber cloth is aligned.

[0006] Further, the non-metallic base pipe is graphite pipe or silicon carbide pipe.

[0007] Further, the mesh size on the carbon fiber cloth is 0.1x0.1mm ~ 50x50mm.

[0008] Further, the carbon fiber cloth is carbon fiber cloth impregnated with acid-resistant resin.

[0009] This new design uses high-tensile-strength carbon fiber cloth wrapped around the outside of a graphite or silicon carbide tube, significantly improving the tube's seismic toughness and, in particular, its internal safety pressure resistance. The inherent mesh of the carbon fiber cloth does not affect the pipe's heat exchange efficiency. This allows high-pressure liquids or gases that do not scale or only slightly scale to pass through the toughened graphite or silicon carbide tube, effectively resolving the shortcomings of existing non-metallic heat exchange tubes, such as poor toughness and low internal safety pressure resistance. It also significantly reduces scaling on the tube wall, lowers cleaning costs, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0011] Figure 2 This is a pipeline diagram of the present utility model. DETAILED DESCRIPTION

[0012] The content of the utility model is further described below in conjunction with the accompanying drawings.

[0013] like Figure 1 、 Figure 2 As shown, a toughened non-metallic composite heat exchange tube includes a non-metallic base tube 1 and one or more layers of carbon fiber cloth 2 with mesh 3 wrapped around the surface of the non-metallic base tube. Figure 2 The mesh 3 is schematically enlarged in the figure. If two or more layers of carbon fiber cloth 2 are provided, the mesh openings on each layer should be aligned as closely as possible to ensure optimal heat transfer for the non-metallic base tube. The non-metallic base tube may be a graphite tube or a silicon carbide tube. Graphite tubes, silicon carbide tubes, and carbon fiber cloth are all prior art products and are commercially available. The ink tube and silicon carbide tube may be products manufactured and sold by the applicant. The mesh opening size of the carbon fiber cloth is preferably controlled within the range of 0.1 x 0.1 mm to 50 x 50 mm.

[0014] This embodiment uses a 32mm diameter, 4mm wall-thick graphite tube as the base tube (common heat exchange tubes have a 32mm diameter and 5mm wall thickness). The graphite tube is wrapped with two layers of 0.2mm thick carbon fiber cloth. The mesh size of the carbon fiber cloth is 5x5mm, and the mesh of the upper and lower layers is aligned as much as possible. The carbon fiber cloth is pre-impregnated with an acid-resistant resin (such as polyacrylate or polymethyl methacrylate), then pressed and bonded securely. The resulting toughened graphite heat exchange tube has a thermal conductivity similar to that of a common 5mm thick graphite heat exchange tube, but its internal pressure resistance is increased from 0.3MPa to over 1.6MPa, making it fully capable of safely passing saturated steam or other high-temperature vapors or gases.

Claims

1. A toughened non-metallic composite heat exchange tube, characterized in that: It comprises a non-metallic base tube (1), and one or more layers of carbon fiber cloth (2) with mesh holes (3) wrapped around the outer surface of the non-metallic base tube, wherein the mesh holes on each layer of carbon fiber cloth are aligned.

2. The toughened non-metallic composite heat exchange tube according to claim 1, characterized in that: The non-metallic base tube is a graphite tube or a silicon carbide tube.

3. The toughened non-metallic composite heat exchange tube according to claim 1 or 2, characterized in that: The mesh size of the carbon fiber cloth is 0.1x0.1mm to 50x50mm.

4. The toughened non-metallic composite heat exchange tube according to claim 1 or 2, characterized in that: The carbon fiber cloth is a carbon fiber cloth pre-impregnated with an acid-resistant resin.

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