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Heat exchange tube of waste heat boiler

A waste heat boiler and heat exchange tube technology, applied in boiler water tubes, boiler smoke tubes/fire tubes, steam boilers, etc., can solve problems such as limiting the use range of heat exchange tubes and unstable fluoroplastic films.

Active Publication Date: 2020-02-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the instability of fluoroplastic film at high temperature, it can only be used at 300°C, which limits the scope of use of heat exchange tubes.

Method used

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  • Heat exchange tube of waste heat boiler
  • Heat exchange tube of waste heat boiler
  • Heat exchange tube of waste heat boiler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The nano-alumina anti-corrosion coating 3 includes the following five ingredients: nano-alumina, calcium aluminate, calcium phosphate, nano-aluminum powder and nano-alumina sol; the average particle size of the nano-alumina is 20nm, and the purity is ≥99.9%; The average particle size of the nano-aluminum powder is 50nm; the average particle size of the nano-alumina sol is 10-15nm, the solid content is 25%, and the pH value is 4; the purity of the calcium aluminate and calcium phosphate is ≥99%. Raw materials were obtained commercially.

[0041]The nano-alumina anti-corrosion coating consists of the following ingredients in parts by mass: 50 parts of nano-alumina, 5 parts of calcium aluminate, 5 parts of calcium phosphate, and 20 parts of nano-aluminum powder. Add 20 parts of nano-alumina sol to the coating ingredients mixed in proportion, and grind in a ball mill for 2 hours to obtain a homogeneous phase mixture. The homogeneous phase mixture is sprayed on the outer su...

Embodiment 2

[0044] The nano-alumina anti-corrosion coating 3 includes the following five ingredients: nano-alumina, calcium aluminate, calcium phosphate, nano-aluminum powder and nano-alumina sol; the average particle size of the nano-alumina is 20nm, and the purity is ≥99.9%; The average particle size of the nano-aluminum powder is 50nm; the particle size of the nano-alumina sol is 10-15nm, the solid content is 25%, and the pH value is 4; the purity of the calcium aluminate and calcium phosphate is ≥99%.

[0045] The nano-alumina anti-corrosion coating consists of the following ingredients in parts by mass: 40 parts of nano-alumina, 10 parts of calcium aluminate, 10 parts of calcium phosphate, and 30 parts of nano-aluminum powder. Add 10 parts of nano-alumina sol to the coating ingredients mixed in proportion, and grind in a ball mill for 2 hours to obtain a homogeneous phase mixture. The homogeneous phase mixture is sprayed on the outer surface of the heat exchange tube 1 that has been ...

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Abstract

The invention discloses a heat exchange tube of a waste heat boiler. The heat exchange tube comprises a tube body. An anti-corrosion coating is sprayed to the outer surface of the tube body. Components of the anti-corrosion coating comprise Al2O3, CaAl2O4 and Ca3(PO4)2. On the surface of the nanometer anti-corrosion coating, HF reacts with Al2O3, CaAl2O4 and Ca3(PO4)2 to generate AlF3 and Ca5(PO4)3F to closely wrap the surface of the coating, and therefore corrosion of HF to the interior of the coating and the heat exchange tube is effectively stopped. Meanwhile, due to the adoption of the anti-corrosion coating with the specific components, the heat exchange tube can resist fluorine corrosion under the high temperature being 600 DEG C or above, and the heat exchange tube can be used underthe largest high temperature being 1000 DEG C or above.

Description

technical field [0001] The invention relates to the field of waste heat boiler anti-corrosion technology, in particular to a waste heat boiler heat exchange tube resistant to high fluorine flue gas corrosion. Background technique [0002] my country's fluorine chemical industry started in the 1950s and 1960s. After more than 60 years of rapid development, my country has become the world's largest producer and exporter of basic fluorine chemical products. In the production process of fluorine chemical industry, such as product dehydrogenation, refining and other processes will produce organic waste liquid and waste residue such as fluorine-containing organic high boilers. The fluorine content in these wastes reaches more than 1%, and the highest exceeds 50%. Fluorine-containing organic wastes are chemically stable due to the presence of fluorine, and a considerable part of them are persistent bioaccumulative toxic substances that are not easy to degrade. These wastes are hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/40F28F19/02C23F15/00B05D1/02B05D3/12B05D3/02
CPCF28F1/40F28F19/02C23F15/00B05D1/02B05D3/12B05D3/0254B05D2254/02Y02P70/10F23G5/48F22B37/04F22B37/10F16L58/14F23M5/08C23C22/08C23C22/74F22B37/025F22B37/06
Inventor 马增益李文瀚张艺颗严建华高若峰陈哲蔡亚明钟浦城
Owner ZHEJIANG UNIV
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