News
News
29
2018
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11
Principle and characteristics of heat pipe heat exchanger
Introduction of heat pipe of heat pipe exchanger
Heat pipe is a kind of heat transfer element with high thermal conductivity.It transfers heat through the evaporation and condensation of working medium in the fully enclosed vacuum shell.It has a series of advantages,such as high thermal conductivity,good isothermal,arbitrary change of heat transfer area on both sides of cold and hot,long-distance heat transfer,temperature control and so on.The disadvantage is poor oxidation resistance and high temperature resistance.This shortcoming can be solved by installing a set of ceramic heat exchanger in the front,which solves the problem of high temperature resistance and corrosion resistance.
The heat exchanger with heat pipe as heat transfer element has the advantages of high heat transfer efficiency,compact structure,small fluid resistance loss,and is conducive to the control of dew point corrosion.At present,it has been widely used in metallurgy,chemical industry,oil refining,boiler,ceramics,transportation,light textile,machinery and other industries.As an energy-saving equipment for waste heat recovery and thermal energy utilization in the process,it has achieved remarkable economic benefits.
Brief introduction to the principle of heat pipe heat exchanger
A layer of liquid wick with porous capillary structure is embedded in the inner wall of the closed high vacuum pipe or cylinder,which is filled with liquid phase working medium.The external heat source inputs heat in the evaporation section to make the working medium evaporate and vaporize.The steam flows to the condensation section for condensation,and the released latent heat of vaporization is sent to the outside world.The condensate is retracted into the wick and flows back to the evaporation section under the action of capillary pressure to complete the automatic circulation of working medium.
Characteristics of heat pipe heat exchanger
1.The heat pipe heat exchanger can completely separate the cold and hot fluids through the spacer plate of the heat exchanger.When a single heat pipe is damaged due to wear,corrosion,overheating and other reasons during operation,the operation of the heat exchanger is basically not affected.The heat pipe heat exchanger has high reliability when it is used in the fluid heat exchange occasions that are easy to be natural,explosive and corrosive.
2.The cold and hot fluids of the heat pipe heat exchanger flow completely separately,which can easily realize the countercurrent heat transfer of the cold and hot fluids.Both cold and hot fluids flow outside the tube.Because the heat transfer coefficient of the flow outside the tube is much higher than that of the flow inside the tube,it is very economical to use it in the heat recovery occasions with low grade.
3.For the fluid with high dust content,the heat pipe heat exchanger can solve the problems of wear and ash blockage of the heat exchanger by changing the structure and expanding the heating surface.
4.When the heat pipe heat exchanger is used to recover the residual heat of corrosive flue gas,the wall temperature of the heat pipe can be adjusted by adjusting the heat transfer area of the evaporation section and the condensation section,so that the heat pipe can avoid the largest corrosion area as far as possible.
The working principle of the heat pipe heat exchanger and the characteristics of the heat pipe heat exchanger briefly introduced above must be clear about the characteristics of this product before we buy the heat pipe heat exchanger.Only when we are familiar with this product enough,can we buy a reassuring product,and in the process of use,there will be no such problems.
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