Temporary treatment of plate heat exchanger gasket aging

2020-11-25 17:03:00

      Temporary treatment of plate heat exchanger gasket aging: The softening of the elastic gasket is related to pressure and temperature. When the gasket loses its elasticity, the Plate heat exchanger will leak. In some products, in order to solve the problem caused by the aging of the gasket The dripping phenomenon allows the sealing performance of the heat exchanger to be adjusted, that is, the bolts of the combined Plate heat exchanger are tightened again, and the pressing force of the elastic gasket between each heat exchanger is adjusted to solve the dripping problem.

        The nameplate of the Plate heat exchanger with this function generally gives the maximum and minimum allowable stress. For the new Plate heat exchanger set, the minimum allowable stress should be used for connection and fixation. Depending on each set of Plate heat exchanger sheets You can adjust the tightening force of the Plate heat exchanger one or more times. Each time you tighten, you can screw the nut into 3mm, and always pay attention to the stress of the adjusting plate during the tightening process, and only allow for no working pressure For the heat exchanger, the tightening force is adjusted at room temperature to prevent dripping.

        For Plate heat exchangers that do not give the stress adjustment range on the nameplate, the stress value is generally given in the parts drawing. When tightening this type of Plate heat exchanger, the tightening torque should not be lower than the value specified in the drawing in any case, because it It is related to the assembly quality and assembly deformation of the Plate heat exchanger. When the tightening torque reaches the specified value, the elastic gasket can be replaced in a planned manner. For the Plate heat exchanger used in important production equipment and corrosive media, It is recommended to have a set of spare seals. When the warehouse temperature is 18℃, the seals of the Plate heat exchanger can be stored for about 3 years in the transparent plastic packaging.

        The fixing of Plate heat exchanger seals, in principle, the fixing of seals is divided into two categories: adhesive fixing and non-adhesive fixing. The shape of the gasket should be consistent with the shape of the plate heat exchanger seal, and it must be pointed out that the The connection type fixing method does not have any effect on the sealing function.

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    2020-02-06 17:25:09
    Vicarb heat exchanger plates have been widely used in some areas such as central heating and chemical industry. The plate heat exchanger has a good heat exchange effect, but it is prone to produce scale and impurities, which will block the flow of the plate heat exchanger and reduce the heat exchange effect. So, how to clean the plate heat exchanger?Plate heat exchangers can be disassembled and recirculated.

    Disassembly and cleaning steps:
    Disassembly and cleaning can clean both processes of the heat exchanger. The main steps are:
    1. Close the two water inlet and outlet valves of the heat exchanger;

    2. Measure the distance between the baffles of the heat exchanger and make a record;

    3. Disassemble the plate heat exchanger, empty the medium in the equipment, disassemble in the prescribed order, and make a record. Be careful not to damage the gasket and the plate during the disassembly process;

    4. During the cleaning process, the plates should be cleaned piece by piece, and soaked and washed. In the case of high-pressure cleaning, the cleaning should be performed below the specified pressure;

    5. After processing, put it back in the plate heat exchanger baffle in the original order, paying attention to distinguish the front and back. Control the strength when tightening the clamping bolts firmly, otherwise it is easy to crush the plate;

    6. Open the outlet valve and inlet valve of the plate heat exchanger to see if there is any leakage. If there is no leakage, the cleaning is complete.

    Cycle cleaning steps:
    If it is used in the chemical industry, firstly close the inlet and outlet valves of the plate heat exchanger, and add the cleaning agent to the system through a tube pump or a water tank for internal circulation until the concentration of the cleaning agent no longer changes and the impurities in the equipment are discharged.

    If it is a passivation treatment, it is necessary to ensure that after the chemical descaling is completed, no rust or other phenomena will occur in the pipeline. The amount of passivation cleaning solution needs to be determined according to the amount of water during cleaning, and the ph value cannot be too high, otherwise the effect will be poor, and it will be discharged after six hours.

    Finally, the plate heat exchanger was restored, and the inlet and outlet water valves were opened, indicating that the cleaning was completed.

  • The role and advantages,disadvantages of plate heat exchangers

    2020-01-27 17:14:32
    Plate heat exchangers are a type of mobile device that transfers heat between metal plates because the liquid is spread over more surfaces, which increases the exchange rate. Metal tubes are used to heat fluids.

    The role of plate heat exchangers
    The plate heat exchanger is based on different external and internal components, the welding plate exchange plates are welded together, and the brazed plate type construction model is vacuum brazed. In many cases, in order to make smaller sections work better, some chambers are designed to be thinner, allowing most of the liquid to contact the plate, improving heat transfer.

    The plate heat exchanger can play a good heat transfer effect in the boiler heating in winter. In the daily use process, it is necessary to do a good job of protecting this equipment. The plate heat exchanger is a kind of equipment that can play multiple benefits and functions for us. The user clearly knows its role and protects it so that it can play a greater role.

    Advantages of plate heat exchangers
    High heat transfer coefficient. The plate heat exchanger has a small flow channel, the plates are wavy, and the cross-section changes are complex, which makes the flow direction and velocity of the fluid constantly change, which increases the disturbance of the fluid and has a high heat transfer coefficient.

    Great adaptability. The required heat transfer area can be achieved by increasing or decreasing the plate. A heat exchanger can be divided into several units, which can be used for heating or cooling between several fluids at the same time.

    Compact structure, small size and few consumables. The heat transfer area per cubic meter volume can reach 250m2, and the heat transfer surface per square meter only needs about 15kg of metal.

    Dirt factor is small. Due to the large flow disturbance, dirt is not easily deposited. The plate heat exchanger plate is of good material and has little corrosion, which makes its fouling coefficient value smaller. Plate heat exchangers mainly use metal plates, so the price of raw materials is cheaper than the same metal pipes.

    Disadvantages of plate heat exchangers
    1) Poor sealing and easy to leak. The gasket needs to be replaced frequently, which is troublesome.
    2) The use pressure is limited, and generally does not exceed 1MPa.
    3) The use temperature is limited by the temperature resistance of the gasket material.

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    gasketed plate heat exchanger

     
    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
    VHX52 920 320 25 450 640 140 DN50
    VHX61 835 325 50 630 625 130 DN65
    VHX62 1085 325 50 630 875 130 DN65
    VHX101 1084 470 120 950 719 225 DN100
    VHX102 1084 470 80 640 719 225 DN100
    VHX103 1235 500 115 1125 882 234 DN100
    VHX104 1655 500 115 1125 1302 234 DN100
    VHX151 1885 650 235 1410 1294 298 DN150
    VHX152 1885 610 160 1255 1294 298 DN150
    VHX201 2055 730 235 1645 1478 342 DN200
    VHX301 2086 1125 215 2580 1320 600 DN300
    VHX351 2920 1190 210 3360 1842 596 DN350
    Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
    Available connection material: rubber/stainless steel/unlined/flange

     

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    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
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    VHX104 1655 500 115 1125 1302 234 DN100
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    VHX201 2055 730 235 1645 1478 342 DN200
    VHX301 2086 1125 215 2580 1320 600 DN300
    VHX351 2920 1190 210 3360 1842 596 DN350
    Available plate material: AISI304/AISI316/Titanium/Nickel/Alloy C-276/254 SMO
    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
    Available connection material: rubber/stainless steel/unlined/flange

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    2019-07-04 16:15:04

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    Model Height Width Min Standard Length Max Standard Length Vertical Port Distance Horizontal Port Distance Connection
    VHX25 480 180 20 350 357 60 DN25
    VHX51 940 330 35 600 640 140 DN50
    VHX52 920 320 25 450 640 140 DN50
    VHX61 835 325 50 630 625 130 DN65
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    VHX201 2055 730 235 1645 1478 342 DN200
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    VHX351 2920 1190 210 3360 1842 596 DN350
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    Available gasket material: NBR/EPDM/HNBR/NBR-HT/EPDM-HT/Viton-A/FKM/Viton-G/FKM/CR
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