Flue gas condensation-type heat transfer pipe with bionic structure

A technology of flue gas condensation and heat transfer tubes, which is applied in the direction of heat transfer modification, tubular elements, heat exchange equipment, etc., can solve problems such as instability, and achieve the effects of small rolling resistance, favorable rolling, and enhanced heat transfer characteristics

Inactive Publication Date: 2012-07-04
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, bead condensation depends largely on the surface condition of t

Method used

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  • Flue gas condensation-type heat transfer pipe with bionic structure
  • Flue gas condensation-type heat transfer pipe with bionic structure
  • Flue gas condensation-type heat transfer pipe with bionic structure

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the present invention prepares a biomimetic structure surface in which hydrophilic protrusions 1 are distributed on a superhydrophobic substrate 2 on the surface of a conventional flue gas condensation heat transfer tube. Through surface modification measures, the surface with a surface contact angle θ less than 90° is called a "hydrophilic surface"; the surface with a very large surface contact angle θ (usually greater than 150°) is called a "superhydrophobic surface". When the water droplets wet the hydrophilic surface, the solid-liquid contact area is larger, showing the state as figure 1 (a) shown. For a superhydrophobic solid surface, its wettability is as follows figure 1 As shown in (b), the uneven surface has tiny hydrophobic protrusions, the grooves are filled with air, the contact area between water and solids wi...

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Abstract

The invention discloses a flue gas condensation-type heat transfer pipe with a bionic structure. The surface of the conventional flue gas condensation-type heat transfer pipe is prepared into a bionic structure surface which is characterized in that hydrophilic protrusions are distributed on an ultra hydrophobic base. When flue gas passes through the heat transfer pipe, water vapor in the flue gas is subjected to the condensation process comprising three links, namely absorption, polymerization growing and falling off, on the bionic structure surface. The flue gas condensation-type heat transfer pipe with the bionic structure can deeply intensify the condensation link of the water vapor in the flue gas, and bead-shaped condensate can be stably formed on the surface of the heat transfer pipe. According to the invention, waste heat and water resources in the industrial flue gas can be recycled efficiently, the energy resource utilization ratio is improved, and low-temperature corrosion can be prevented to a certain extent. The flue gas condensation-type heat transfer pipe with the bionic structure provided by the invention is quite suitable for the low-temperature-difference heat transfer in the industrial field.

Description

technical field [0001] The invention relates to a condensing heat transfer tube widely used in energy, chemical industry, metallurgy, electric power and other industrial fields to realize deep utilization of waste heat of flue gas and recovery of water resources, in particular to a bionic structure flue gas condensing heat transfer tube Tube. Background technique [0002] Power plant boilers and industrial boilers are two major energy-consuming equipment. Their design exhaust gas temperatures are both higher than 100°C. In actual operation, the exhaust gas temperature is 5-10°C higher than the design value, which further reduces the boiler efficiency. Flue gas waste heat includes sensible heat and latent heat. Taking coal-fired and gas-fired boilers as examples, the volume share of water vapor in the flue gas of coal-fired boilers is about 8%, and the heat carried accounts for about 30%. The volume of water vapor in the flue gas of gas-fired boilers The share is as high as ...

Claims

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Application Information

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IPC IPC(8): F28F1/36F28F13/04
Inventor 唐桂华胡浩威王禹晨何雅玲
Owner XI AN JIAOTONG UNIV
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