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Anticorrosion method for interior of metal flue

A flue internal and metal technology, which is applied in the high temperature and dilute acid corrosive environment of the inner wall of the flue, and in the field of metal flue anticorrosion, can solve the problems of complex construction process and poor heat resistance of anticorrosion coating, and achieve the effect of simple construction

Active Publication Date: 2014-04-30
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the aforementioned problems of poor heat resistance of the anti-corrosion coating and complicated construction techniques, the present invention proposes a metal flue anti-corrosion method, which has good high temperature resistance and acid resistance, and is simple and easy to construct, and can be used at room temperature (25°C). to solidify

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  • Anticorrosion method for interior of metal flue

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] 1. Before construction, clean the inner surface of the metal flue to keep it clean, dry and oil-free. The rust in the metal flue is removed by combining manual grinding and mechanical sandblasting, and the alkali cleaning solution is sprayed onto the inner surface of the metal flue to remove the grease on it. The self-alkali cleaning solution includes sodium hydroxide and trisodium phosphate in a mass ratio of 1: 1 mix. The spray pressure is 0.1~0.2Mpa, the time is 1.5~3 minutes, and it is dried naturally.

[0026] 2. Use expanded graphite with a sulfur content of 500ppm and a chlorine content of 15ppm to prepare a plate with a thickness of 2mm and a density of 1.6g / cm by roll forming 3 The flexible graphite plate is cut into a size of 1m×1m.

[0027] 3. Brush a layer of TH896W-30 epoxy resin high temperature resistant adhesive with a thickness of 0.05mm on the inner wall of the metal flue and the surface of the flexible graphite plate, and soak it in hot water before...

Embodiment 2

[0032] 1. Before construction, clean the inner surface of the metal flue to keep it clean, dry and oil-free. The rust in the metal flue is removed by combining manual grinding and mechanical sandblasting, and the alkali cleaning solution is sprayed onto the inner surface of the metal flue to remove the grease on it. The self-alkali cleaning solution includes sodium hydroxide, sodium carbonate, and sodium sulfate in a mass ratio of 1:2:1 mix. The spray pressure is 0.1~0.2Mpa, the time is 1.5~3 minutes, and it is dried naturally.

[0033] 2. Use expanded graphite with a sulfur content of 500ppm and a chlorine content of 15ppm to prepare a plate with a thickness of 2mm and a density of 1.6g / cm by roll forming 3 The flexible graphite plate is cut into a size of 1m×1m.

[0034] 3. Brush a layer of water-based polyurethane adhesive with a thickness of 0.05mm on the inner wall of the metal flue and the surface of the flexible graphite plate, and soak it in hot water before use to i...

Embodiment 3

[0039] 1. Before construction, clean the inner surface of the metal flue to keep it clean, dry and oil-free. The rust in the metal flue is removed by combining manual grinding and mechanical sandblasting, and the alkali cleaning solution is sprayed onto the inner surface of the metal flue to remove the grease on it. The self-alkali cleaning solution includes sodium silicate, sodium carbonate and sodium sulfate in a ratio of 3:2 :1 mass ratio mixed. The spray pressure is 0.1~0.2Mpa, the time is 1.5~3 minutes, and it is dried naturally.

[0040] 2. Use expanded graphite with a sulfur content of 500ppm and a chlorine content of 15ppm to prepare a plate with a thickness of 2mm and a density of 1.6g / cm by roll forming 3 The flexible graphite plate is cut into a size of 1m×1m.

[0041] 3. Brush a layer of polyoxyethylene ether high temperature resistant adhesive with a thickness of 0.05mm on the inner wall of the metal flue and the surface of the flexible graphite plate, and soak ...

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Abstract

The invention relates to an anticorrosion method for the interior of a metal flue. The method includes the steps of using flexible graphite plates as anticorrosive materials, carrying out normal-temperature curing on selected adhesive, pasting the flexible graphite plates coated with the adhesive on the inner surface of the metal flue coated with the adhesive, filling graphite paste and spraying graphite sizing agents. Through the method, the flexible graphite plates can be laid conveniently and rapidly, are easy to construct, capable of resisting 250 DEG C high temperature and resisting acid corrosion and applicable to various neutral gases or various acid gases or various fluid pipelines such as metal chimneys, petroleum pipelines and drainage pipelines, and are used for anticorrosion of the interior of the flue.

Description

technical field [0001] The invention relates to a metal flue anticorrosion method, which belongs to the technical field of metal anticorrosion, and is suitable for the environment of high temperature and dilute acid corrosiveness on the inner wall of the flue. Background technique [0002] The high-temperature flue gas (150°C-200°C) generated during the waste incineration process needs to be discharged through the metal flue, and the high-temperature flue gas is mainly composed of HCl, HF, SO 2 , NO x , CO, etc., meet some chemical media, produce dilute sulfuric acid, sulfate or other compounds, which are extremely corrosive, and bring dew point corrosion problems to the metal flue. Therefore, how to prevent the above-mentioned high-temperature acid flue gas from corroding the metal flue has become a key technical problem. [0003] At present, metal anticorrosion mainly includes electrochemical anticorrosion and coating anticorrosion. The principle of electrochemical anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J13/02
Inventor 吴海华熊盼李厅郭辉黄川刘富林
Owner CHINA THREE GORGES UNIV
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