A tube and use of said tube

A pipe wall, metal pipe technology, applied in the field of use of pipes and said pipes, can solve problems such as pipe blockage

Inactive Publication Date: 2011-06-22
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such pipes made of said other common materials, there is also the risk that the pipes will be completely blocked by carbonized coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] According to an embodiment of the invention, said surface coating is designed to have a said emissivity coefficient of more than 0.8, which would increase the efficiency relative to such tubes without a surface coating having an emissivity coefficient of 0.7. be significantly improved.

[0011] According to another embodiment of the invention, only one, ie the first, of said outer and inner surfaces of said pipe is coated with said surface coating to allow the other of said outer and inner surfaces of the pipe to One, the second, is in contact with the gaseous atmosphere, so that any risk of unwanted substances entering this gaseous atmosphere from the coating can be avoided. Said increase in heat dissipation efficiency will be best if both the outer and inner surfaces of the tube are coated with said surface coating, but where it is necessary to avoid the entry of undesirable substances from the coating into the gaseous atmosphere outside or inside the tube In case of...

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Abstract

A metallic tube for heating a medium or subject outside thereof or inside it by transfer of heat energy through walls of the tube, in which heat is absorbed or emitted at least to a substantial degree by radiation on one or both of the inner and outer surfaces of the tube, is of a material forming a layer of essentially AI2O3 on the surfaces thereof when heated to at least approximately 750 C. Atleast one of the external and the internal surface of the tube is coated by one of a metal, metal alloy and metal compound, which after oxidation forms a layer having an emissivity coefficient exceeding 0.7, or by a layer essentially consisting of a metal oxide which has an emissivity coefficient exceeding 0.7.

Description

technical field [0001] The present invention relates to a metal tube for heating a medium or object inside or outside the metal tube by transferring heat energy through the tube wall, wherein at least a major part of the heat passes on one or both of the inner and outer surfaces of the metal tube The metal tube is made of a material which, when heated to at least approximately 750°C, forms on its surface substantially Al 2 o 3 layer. Background technique [0002] Such pipes can be used for all types of heat dissipation, such as occur in carburizing environments, ie in environments where carbonized coal (coke) can be produced. This particular use of the tube will be explained below. Tubes with fins as well as smooth tubes are included. [0003] SE C2 524010 discloses a tube of this type for use in cracking furnaces in which gaseous hydrocarbons flowing in the tube are cracked into ethylene, H 2 C=H 2 C, Ethylene is used as a raw material in the plastics industry. In or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C30/00C22C38/22C22C38/28C10G9/20
CPCC22C38/22C10G2400/20C22C38/06C23C14/5853C23C14/16C10G9/203C23C30/00
Inventor 克拉斯·欧恩格伦保·荣松
Owner SANDVIK INTELLECTUAL PROPERTY AB
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