Application of gas buffered heat pipe for preventing dew-point corrosion

A gas-filled heat pipe and dew point corrosion technology, applied in damage protection, heat exchange equipment, indirect heat exchangers, etc., can solve problems that have not been seen in the application, and achieve the effect of avoiding dew point corrosion

Inactive Publication Date: 2008-11-12
余传林 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the concept of gas-filled heat pipes has been proposed for a long time, its application background is mainly in aerospace and fields that require precise control of thermal loads. It is called "variable thermal conductivity heat pipes" in relevant literature. At present, it has not been seen that in order to prevent dew point corrosion in the low temperature section Application of flue gas waste heat recovery

Method used

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  • Application of gas buffered heat pipe for preventing dew-point corrosion
  • Application of gas buffered heat pipe for preventing dew-point corrosion
  • Application of gas buffered heat pipe for preventing dew-point corrosion

Examples

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Embodiment 1

[0069] A heat pipe air preheater is used to recover the exhaust heat of a certain boiler. After design, the geometric characteristics of the selected carbon steel-water heat pipe elements are as follows:

[0070] The outer diameter of the base tube: 38mm, the inner diameter of the base tube is 32mm, the wall thickness is 3mm, the length of the evaporation section Le=2.0m, the length of the cooling section Lc=1.5m, there are high-frequency welded spiral circular fins on the outside of the base tube, and the fin spacing Both are 8mm, and the fin height is 16mm;

[0071] The flue gas inlet temperature is 220°C and the outlet temperature is 150°C; the air inlet temperature is 20°C and the outlet temperature is 100°C.

[0072] After calculation, the acid dew point of the smoke exhaust is 120°C. In order to prevent dew point corrosion, it is planned to use air-filled heat pipes. It is hoped that the wall temperature of all heat pipes will be above 130°C. Try to calculate the length ...

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Abstract

The invention discloses an application of a gas-filled heat pipe in avoiding the dew point corrosion of a heat pipe exchanger. The gas-filled heat pipe comprises an evaporation segment and a condensation segment filled with a work substance. The application is characterized in that the condensation segment is also simultaneously filled with inert gases or nitrogen gas according to specified length and specified quantity of filled gases and can be filled with a mixture combined by gas molecules and the steam molecule of the work substance. The filled inert gases can automatically change occupied volume and filled gas length so as to change and adjust the temperature in the pipe and wall surface temperature, thus achieving the purpose of avoiding the dew point corrosion of the heat pipe.

Description

technical field [0001] The present invention relates to a direct contact heat exchange device with two heat exchange media of state change being gas or steam, in particular to a heat pipe with an evaporation section and a condensation section. Background technique [0002] In order to improve energy utilization and achieve the energy-saving goal of "consumption reduction and emission reduction", the exhaust gas temperature of energy equipment such as boilers is required to be reduced as much as possible, from the original exhaust gas temperature of 220-180 °C to 160-150 °C. It is even required to drop even lower, reaching 120-100°C. [0003] The biggest challenge encountered in the application of heat pipe heat exchangers such as heat pipe air preheaters and heat pipe economizers in low-temperature smoke exhaust environments is the acid dew point corrosion of flue gas, especially when burning coal and heavy oil with high sulfur content. more serious. In order to avoid dew ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D15/02
CPCF28D15/0275F28D15/0283F28F19/00
Inventor 余传林刘纪福
Owner 余传林
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