A liquid separation phase change plate heat exchanger and its application

Abstract

A liquid-separating phase-changing plate heat exchanger and an application thereof, comprising a mobile pressing plate (1), a fixed pressing plate (2), at least one heat exchange plate (3) and a plurality of seal gaskets, wherein the heat exchange plates (3) are disposed between the mobile pressing plate (1) and the fixed pressing plate (2); the seal gaskets are disposed between the mobile pressing plate (1) and the heat exchange plates (3) as well as between the fixed pressing plate (2) and the heat exchange plates (3), or directly between adjacent heat exchange plates (3), so as to form passageways; the passageways are working fluid passageways (24) and cold and heat source fluid passageways (25); the working fluid passageways (24) are internally provided with a first heat exchange zone (14), a middle zone (15) and a second heat exchange zone (16); and liquid guide chutes (17) and first U-shaped channels (22) are provided at two sides of the second heat exchange zone (16). When the plate heat exchanger is used as a condenser, the thickness of a condensate film is reduced, the thermal resistance for condensing heat transfer is also reduced, and the condensing heat transfer effect is improved. When the present heat exchanger is used as an evaporator, steam and a liquid working medium may be well mixed, the steam dryness in the first heat exchange zone (14) is reduced, the heat transfer coefficient is raised, and an evaporation heat transfer effect is thus improved.

Description

【Technical field】 [0001] The invention relates to the field of heat exchangers, especially a liquid-separating phase-change plate that can thin the condensed liquid film and enhance condensation heat transfer when used as a condenser; and can reduce the dryness of the end working medium and enhance evaporation and heat transfer when used as an evaporator Heat exchangers and their applications. 【Background technique】 [0002] The plate heat exchanger is composed of a group of thin metal plates with sealing gaskets. The corner holes on the metal plates rely on the sealing gaskets to form a continuous flow channel to drain the working fluid from the inlet to the adjacent metal plates. Heat exchange is carried out in the composed flow channel. [0003] During the working process of the condenser, the steam condenses on the condensation wall, and the condensate will spread into a liquid film on the wall. A film of condensate separates the vapor from the condensing wall, and und...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that when the existing plate heat exchanger is used as a condenser, the condensate film cannot be thinned in time, resulting in low condensation effect, and when it is used as an evaporator, the end dryness is too high, resulting in low heat transfer coefficient. Liquid phase change plate heat exchanger

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