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What difference between brazed plate heat exchanger and detachable plate heat exchanger?

Views:1     Author:Site Editor     Publish Time: 2020-04-08      Origin:Site

The detachable plate heat exchanger is composed of many pressed corrugated metal thin plates at certain intervals, sealed around by gaskets, and compacted by the frame and clamping bolt pairs. The four corner holes of the plates and gaskets are formed The distribution pipe and the collection pipe of the fluid are at the same time, and the cold and hot fluids are reasonably distributed freely, and the heat is transferred through the plates to achieve the purpose of exchange.

 

Brazed plate heat exchanger is a new type of high-efficiency heat exchanger formed by stacking a plurality of metal sheets with a certain corrugated shape through brazing. Thin rectangular channels are formed between the various plates, and the fluid flows through the plates through the channels between the plates through the carefully arranged corner and edge interfaces. The refrigerant and the heat medium always reverse flow in the adjacent channels for replacement heat. Because the edges of the plates are welded, the media will not alternate from the device. The contact point of each plate of the brazed heat exchanger is also a welding point, and the brake bears the pressure of the medium.

Brazed plate heat exchanger is an evolution of detachable heat exchanger. The sealing material is changed from rubber pad to copper or nickel. All the plates are combined by copper solder or nickel solder. All the contact points of the heat exchanger plates are close and close together, and all the contact points of the brazed heat exchanger must also be completely welded together, so as to ensure that the heat exchanger has the highest heat exchange efficiency and pressure resistance , At the same time can only get the best replacement.

When using brazed plate heat exchangers, the requirements for water quality are relatively strict. Once the water quality is not good (containing impurities), it is very easy to separate and cannot be cleaned after encountering resistance. Can only be replaced, increasing the cost of use!

However, because nickel and stainless steel have far less affinity than copper, nickel brazed plate heat exchangers are pressure-replaced, and their life is reduced when high pressure or temperature fluctuates. Existing laser welded plate heat exchangers have good performance. Moreover, the nickel brazing process is difficult and the cost remains high, and it has not yet become the mainstream.

According to different materials, brazed plate heat exchangers can be divided into: copper brazed plate heat exchangers, nickel brazed plate heat exchangers, copper brazed plate heat exchangers quickly occupy many traditional heat exchanges with their high efficiency, compactness and sealing The territory of the device. However, in the field of many heat exchangers that cannot use copper, it is still a restricted area for the use of copper brazed plate heat exchangers.

The plate heat exchanger is also called a detachable heat exchanger. Slight scale can be backwashed with dilute sulfuric acid or dilute oxalic acid. If the scale is serious, the heat exchanger can be disassembled and cleaned. Use a brush to remove the scale on the plate After the cleaning is completed, the plates can be reassembled and reused, which greatly saves the use cost and prolongs the replacement.

The design and adjustment of the brazed plate heat exchanger plates have no dead angle areas, so they can be cleaned on site without disassembly. On the fixed plate, such a design eliminates the need to dismantle the pipeline when cleaning or repairing the plate, which greatly shortens the maintenance work time.

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