Mixed vapour condensation intensify heat transmission method

A technology of steam condensation and heat transfer enhancement. It is applied in heat transfer modification, heat exchange equipment, lighting and heating equipment, etc. It can solve the problems of increasing mixed steam and power consumption, and achieve the effect of strengthening heat transfer.

Active Publication Date: 2007-12-05
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to strengthen the condensation process of mixed steam in practical applications, such as increasing the flow rate of mixed steam; installing baffles and spoilers; The method enables the transfer to be enhanced while the power consumption is also increased accordingly

Method used

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  • Mixed vapour condensation intensify heat transmission method

Examples

Experimental program
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Embodiment

[0017]Taking a copper pipe as an example (length 400mm, Φ19mm×1mm), the effective length of the condensation section is 265mm, and its surface is modified. The design diagram of the condensation surface is shown in Figure 1, and the designed surface is condensed separately Experimental comparison of heat transfer characteristics. Figure 1(a) shows the film condensation (FWC1) commonly used in actual production. In this form, the condensate film has no obvious fluctuation phenomenon, especially when the content of non-condensable gas is large, the condensate flow rate decreases and the thickness of the liquid film Decrease, the fluctuation of the liquid film is less obvious, this is used as the control group experiment. The condensation on the surface of Figure 1(b) is also film condensation (FWC2), the difference is that a metal shut-off ring modified with Teflon surface is installed on the surface of the condensation pipe at an interval of 50mm, and two tongue-shaped Drainag...

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PUM

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Abstract

There is a sort of heat transfer method of condensation aggrandizement type which mixes the steam, and it belongs to the area of aggrandizement heat transfer and energy-saving technique. It relates concretely to the modified character or the dispose course, and it applies to the set which has incondensable gas or the condensation-heat exchange set which mixes the steam in order to realize the aggrandizement of the condensation-heat exchange character. By changing the flowing form of the condensation liquid and the reciprocity between the dynamic and the boundary layer of the gas phase it makes the condensate which is in the groovy reliable membranous flow method to shell in the form of big dripping, the dripping can slide in the surface or shell along the boundary layer of the gas phase, it decreases the thermal resistance of the film of the condensate, at the same time for the intrusive action of the shell of the dripping, it is propitious to decrease the boundary layer of the heat transfer and the matter transfer, and it consolidates the whole heat transfer character of condensation aggrandizement type which mixes the steam. This invention can be used in the condenser which mixes the industrial material or has the incondensable gas. Its effect and benefit is that: in this instance that not using any additive power consumption, it only use the autologous gravitational effect of the condensate, and it makes the mixed steam heat transfer character of the mixed steam to obtain obvious melioration.

Description

technical field [0001] The invention belongs to the technical field of heat transfer enhancement and energy saving, and in particular relates to a preparation method and application of a heat transfer enhancement surface. Specifically, the heat exchange surface is treated and applied to condensation heat exchange equipment containing non-condensable gas or mixed steam. Background technique [0002] The existence of a small amount of noncondensable gas will have a great influence on the condensation heat transfer process. Similarly, compared with the condensation of a single-component working fluid, the condensation heat transfer characteristics of a non-azeotropic working fluid will be significantly reduced. However, the condensation heat and mass transfer process with noncondensable gas or mixed vapor has a wide application background in industrial production such as petroleum, chemical industry, refrigeration, and electric power. Such as absorption of corrosive component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/18F28F13/04
Inventor 马学虎周兴东兰忠白涛
Owner DALIAN UNIV OF TECH
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