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Waste heat boiler heat exchange tube

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

Active Publication Date: 2020-09-29
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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  • Waste heat boiler heat exchange tube
  • Waste heat boiler heat exchange tube
  • Waste heat boiler heat exchange tube

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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 waste heat boiler heat exchange tube, which comprises a tube body, the outer surface of the tube body is sprayed with a layer of anti-corrosion coating; the composition of the anti-corrosion layer is Al 2 o 3 、CaAl 2 o 4 and Ca 3 (PO 4 ) 2 . On the surface of nano anti-corrosion coating, HF and Al 2 o 3 , CaAl 2 o 4 and Ca 3 (PO 4 ) 2 The reaction produces AlF 3 and Ca 5 (PO 4 ) 3 F, tightly wrapped on the surface of the coating, thus effectively preventing HF from corroding the inside of the coating and the heat exchange tube. At the same time, due to the use of the anti-corrosion coating with a specific composition of the present invention, the heat exchange tube of the present invention can resist fluorine corrosion at a high temperature above 600°C, and can be used at a high temperature above 1000°C.

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 Patents(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