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The most comprehensive knowledge of plate heat exchangers

Views:12     Author:Site Editor     Publish Time: 2020-04-03      Origin:Site

The plate heat exchanger is a new type of high-efficiency heat exchanger stacked by a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Plate heat exchanger is an ideal equipment for liquid-liquid, liquid-vapor heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and lightweight structure, small footprint, convenient installation and cleaning, wide application, long service life and so on.

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Basic structure and operating principle of plate heat exchanger


There are two types of plate heat exchangers: frame type (detachable) and brazed type. There are three types of plate types: herringbone corrugated plate, horizontal flat corrugated plate and knob plate.


Brazed heat exchanger structure


The main structure


⒈Plate heat exchanger plate and plate heat exchanger gasket


⒉Fixed compression plate


⒊Mobile compression plate


⒋Clamping bolt


⒌Upper guide


⒍ Lower guide


7.Rear pillar


A group of plates is stacked into a plate package with a channel pattern. Both ends are configured with end plates with takeovers.


The whole machine is made by vacuum brazing. Adjacent channels respectively flow two media. The plates between adjacent channels are pressed into corrugations. Type to enhance heat exchange between two media. In a brazed plate heat exchanger for refrigeration, there is always one more water channel than the refrigerant channel.

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The picture shows a unilateral flow. Some heat exchangers are made diagonal, that is, Q1 and Q3 hold one medium, and Q2 and Q4 hold another medium.


All are screw and bolt structures for easy field disassembly and repair.


Principle of operation


Plate heat exchanger is a new type of high-efficiency heat exchanger made of metal sheets with a certain corrugated shape. The structure includes gaskets, pressure plates (movable end plates, fixed end plates) and frames (upper and lower guide rods). , Front pillar), the plates are sealed and guided by a gasket to separate the cold / hot two fluid channels, and the cold / hot heat transfer medium flows through the respective channels, and the separated plates perform heat. Exchange to reach the temperature required by the user.


There are openings at the four corners of each plate. After being assembled into a plate bundle, a fluid distribution tube and a collection tube are formed. After the heat exchange of the cold / hot medium, it is recycled from the respective collection tube and recycled.


Principle of heat transfer: heat transfer between walls.


Single process structure: only 2 plates do not transfer heat-head and tail plates.

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The most comprehensive knowledge of plate heat exchangers (principle, structure, design, selection, installation, maintenance)


Double process structure: Each process has 3 plates without heat transfer.

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Plates and runners


There are usually two kinds of corrugated plates (L small angle and H large angle), so there are three different flow channels (L, M and H), as shown below:

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L: small angle A passage consisting of plates with adjacent small angles. Low heat transfer coefficient and low resistance. It is suitable for situations with large flow and weak heat transfer (low specific heat or small temperature difference), such as air heat transfer under ambient pressure.

H: Large angle A channel consisting of adjacent large angle plates. High heat transfer coefficient and high resistance. Suitable for small flow but strong heat transfer (high specific heat, phase change or large temperature difference), such as refrigerant phase change heat transfer.

M: Channel A channel composed of plates with adjacent large / small angles. The heat transfer coefficient and resistance are between the H and L channels.

L L = small angle runner

L H = mixed runner

H H = Large angle runner

Choose among these three runners, and make and choose according to the special working conditions.


In theory, a heat exchanger can mix different types of flow channels, such as H type and M type.


However, in the case of phase change, this will cause the distribution of the medium to be unbalanced between the first H channel and the last M channel. Therefore, it is not used in various types of refrigeration BPHE.


The main role of plate corrugation is to make the fluid turbulent, strengthen the heat transfer of the adjacent plates to form contact points, and improve the pressure resistance.


Note: The chocolate is distributed: make the fluid flow uniformly through the whole plate, the pressure drop at A and B is the same, so that the pressure loss here is minimized, the pressure drop is used for effective heat transfer, and allows parallel flow Has now been widely used. As shown below.


Parallel and diagonal flow:


The most comprehensive knowledge of plate heat exchangers (principle, structure, design, selection, installation, maintenance)


Advantages of parallel flow: one plate & one gasket, the same plate is in the plate group, and the rotation of 180 ° can be used for the loss of spare parts in the two-side channel. It fully meets all the functions of diagonal flow, higher design pressure or the use of thinner plates without cross-out nozzles.

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