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Learn about the advantages of Wuxi brazed plate heat exchangers in one minute

Learn about the advantages of Wuxi brazed plate heat exchangers in one minute

What are the construction points of brazed plate heat exchangers? Let's find out together. 1. The heat exchanger should not be deformed, and the fasteners should not be loose or have other mechanical damage. 2. When lifting equipment, the sling should not be hung on the connecting pipe, positioning beam or plate. 3. Leave enough space around the heat exchanger for maintenance. 4. The installation of the cold and hot medium inlet and outlet connections should comply with the direction specified on the factory nameplate. 5. The pipes connected to the heat exchanger should be cleaned to prevent sundries such as sand and slag from entering the heat exchanger and causing blockage. 6. The heat exchanger should be subjected to a water pressure test of 1.5 times the working pressure. The steam part should not be lower than the steam supply pressure plus 0.3 MPa; the hot water part should not be lower than 0.4 MPa. What is the cleaning process of Wuxi brazed plate heat exchanger? Let's find out together. 1. Isolate the equipment system and drain the water from the heat exchanger. 2. Use high-pressure water to clean the sludge, algae and other impurities in the pipeline, and then close the system. 3. Install a ball valve (> not less than 1 inch = 2.54 cm) between the isolation valve and the exchanger (inlet and outlet). 4. The connection uses a transfer pump and connecting pipe to pump the cleaning agent into the bottom of the heat exchanger, and flow out from the top.

06

2022-12

Anti-freeze protection methods for plate heat exchangers

Anti-freeze protection methods for plate heat exchangers

What are some methods for preventing plate heat exchangers from freezing? Since plate heat exchangers are also used in winter, understanding how to prevent them from freezing is very necessary.

26

2022-08

What is the working principle of a condenser?

What is the working principle of a condenser?

A condenser works by passing gas through a long tube, allowing heat to dissipate into the surrounding air. Metals like copper, which are good conductors of heat, are often used to transport steam.

26

2022-08

Specific cleaning steps for brazed plate heat exchangers

Specific cleaning steps for brazed plate heat exchangers

Cleaning the scale from a brazed plate heat exchanger is a troublesome task. After prolonged use, scaling is inevitable inside the exchanger, leading to poor thermal conductivity, reduced exchange efficiency, and heat energy loss. Therefore, cleaning a brazed plate heat exchanger is something everyone should understand.

26

2022-08

Common malfunctions of plate heat exchangers

Common malfunctions of plate heat exchangers

Leakage Mainly manifested as seepage (small amount, discontinuous water droplets) and leakage (large amount, continuous water droplets). The main parts where leakage occurs are the seals between plates, the secondary sealing leakage grooves of the plates, and the inner side of the end plates and the pressure plates. Liquid Leakage The main characteristic is that the medium on the side with higher pressure enters the medium on the side with lower pressure, and the system will show abnormal pressure and temperature. If the medium is corrosive, it may also cause corrosion of the sealing gasket of the plate heat exchanger. Liquid leakage usually occurs in the flow guiding area or the secondary sealing area. Large Pressure Drop The pressure drop at the inlet and outlet of the medium exceeds the design requirements, or even many times higher than the design value, seriously affecting the system's requirements for flow rate and temperature. In the heating system, if the pressure drop on the hot side is too large, the flow rate on the primary side will be seriously insufficient, that is, the heat source is insufficient, resulting in the secondary side outlet temperature not meeting the requirements. Heating Temperature Cannot Meet Requirements The main characteristic is that the outlet temperature is too low and does not meet the design requirements.

30

2022-09

Cooling characteristics of shell and tube heat exchangers

Cooling characteristics of shell and tube heat exchangers

1. The heat transfer tube adopts a copper tube with externally rolled fins, which has high thermal conductivity and a large heat transfer area. 2. The baffle plates guide the shell-side fluid to flow continuously in a zigzag shape within the heat exchanger. The spacing between the baffle plates can be adjusted according to the optimal flow rate. The structure is robust and can meet the heat exchange requirements of large or even ultra-large flow rates and high pulsation frequency shell-side fluids. 3. When the shell-side fluid is oil, it is suitable for heat exchange of low-viscosity and relatively clean oil.

30

2022-09

Component functions of plate heat exchangers

Component functions of plate heat exchangers

The reasonable selection of heat exchange area is the key to procurement. When selecting a heat exchanger, the required flow rate should be determined first based on process requirements, material viscosity, heat exchange temperature difference, etc. Excessive flow rate leads to waste and easy blockage of the flow channel. Too small a flow rate affects usage, increases non-fermentation time, and can cause adverse phenomena such as damage to the baffle plate due to excessive pressure. Therefore, scientific selection should be made based on operating conditions. Plate heat exchangers have a plate thickness of only 0.6~0.8mm, while tube-shell heat exchangers have a heat exchange tube thickness of 2.0~2.5mm; the shell of a tube-shell heat exchanger is much heavier than that of a plate heat exchanger. Under the same heat exchange mission, the heat exchange area required by a plate heat exchanger is smaller than that of a tube-shell heat exchanger. From a strength perspective, the structure of a tube-shell heat exchanger is excellent, but from a heat exchange perspective, it is not ideal, because when the fluid flows in the shell side, there are bypasses between the baffle plate-shell, baffle plate-heat exchange tube, and tube-shell. The fluid passing through these bypasses does not fully participate in the heat exchange. In a plate heat exchanger, there is no bypass, and the corrugation of the plates allows the fluid to become turbulent at a lower flow rate. Therefore, plate heat exchangers have a higher heat transfer coefficient, usually 3~5 times that of tube-shell heat exchangers.

30

2022-09

Assembly and disassembly of plate heat exchangers

Assembly and disassembly of plate heat exchangers

The newly purchased heat exchanger has been assembled into a whole unit and can be installed as a whole. It should not be disassembled unless necessary. Disassembly and reinstallation of plate heat exchangers is a delicate task that requires experienced personnel to follow certain rules to ensure good sealing and normal operation after installation. Incorrect assembly and installation can cause poor sealing and even plate deformation and damage, which is difficult to restore. Before disassembling the heat exchanger, use a steel ruler to measure the original thickness of the plate pack. Measurements should be taken at the four corners (top, bottom, left, and right) of the equipment and recorded. During reinstallation, this thickness should be restored as much as possible. If the number of plates is increased or decreased, the correct total thickness should be calculated first. For example, with 80 BR50 plates, the nominal thickness is: 80 × (3.8 + 0.6) = 352 mm The difference between the thickness after installation and tightening and the nominal value should be less than 1%; in the above example, the thickness should be between 347 and 357 mm. Plate heat exchangers are usually tightened into a whole unit using 6-12 bolts. When assembling or disassembling, these bolts should be tightened or loosened evenly and balanced; they should never be tightened or loosened unevenly. When disassembling and loosening the bolts, the center bolts should be loosened first, followed by the corner bolts. Initially, loosen 1-2 turns at a time, then more, repeating several times until completely loosened. During the loosening process, the total thickness of the plates should be measured at the four corners, with a left-right deviation of no more than 10 mm and an up-down deviation of no more than 25 mm.

30

2022-09

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