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Common problems and solutions for the maintenance of imported plate heat exchangers_

by:DIGUANG     2021-04-01
Common problems and solutions for the maintenance of imported brand plate heat exchangers

2020-04-29 11:25
540 Compared with ordinary plate heat exchangers, imported brand plate heat exchangers have obvious advantages in terms of quality and use effect. Therefore, they are favored by many consumers. However, any equipment has been used for a long time. , It is inevitable that there will be problems like this, and the imported brand plate heat exchanger is no exception. How much do you know about the common problems and solutions in the maintenance process of this equipment? Due to the convenient disassembly and assembly of the plate heat exchanger and simple maintenance, special tools and equipment are generally not required. Different methods can be used according to different situations. If the equipment does not leak, but the heat transfer system K has dropped, you can use a closed circuit system to pump the descaling liquid into the equipment and circulate for several hours without disassembling the heat exchanger. That's it. If there is no such condition on site, and if the scale is found to be not too serious after disassembling the equipment, you can rinse directly with water without removing the plates, and scrub with a soft brush at the same time. For the normal operation and maintenance of the plate heat exchanger, the equipment that needs to be repaired should be disassembled in the reverse order of installation. Equipment used in the petroleum and chemical industries should be regularly maintained according to the maintenance cycle. If the medium in the equipment is flammable, explosive or corrosive, it should be repaired at least once a year. Plate heat exchangers used in other industries should be inspected and repaired once every three years if there is no leakage. Precautions for the maintenance of imported brand plate heat exchangers ① Replace the cracked or perforated plates, and use the light transmission method to find the cracks in the plate on the spot. ②Adjust the operating parameters to reach the design conditions. ③The clamping size should meet the requirements when repairing and assembling the heat exchanger, not as small as possible. ④The plate data of the plate heat exchanger are reasonably matched. When inspecting the plates of the plate heat exchanger, the plates should be free of defects such as cracks, scratches, deformation, etc. The uneven thickness of the plate should not exceed 5%, the periphery of the plate should be smooth and flat, the shape of the sealing groove should meet the requirements of the drawing, and the depth is allowed The deviation is 0.1mm, and the sealing surface is not allowed to have irregularities, wrinkles, twists, scratches and other defects that affect the sealing performance. The allowable deviation of the plate corrugation depth is ±0.2mm, and the unevenness shall not be greater than 1%. During the disassembly process, the width direction deviation of the movable pressing plate shall not exceed 10mm, and the vertical deviation shall not exceed 25mm, and the movable pressing plate shall be kept basically moving in parallel. Only after the system gas, pressure, temperature and other parameters meet the maintenance requirements, can it enter the construction site. The adhesive used should also be within the validity period. For perforated plates, hydrogen arc welding can be used to repair and flatten. Before disassembly, the medium inlet valve should be blocked, and the high-pressure side valve should be blocked first, and then the outlet valve should be blocked, so that the heat exchanger is slowly cooled to 40°C and then discharged, then the connected pipes should be removed and the whole can be lifted off. Due to the large number of plates in the plate heat exchanger, it needs to be cleaned one by one and replaced with new pads. Therefore, the overall installation position is generally lifted from the installation position during overhaul, and it is disassembled for overhaul at a suitable place. When the scale on the plate is very thin and the scale layer is easily soluble in water, the plate can be placed in a special sink and scrubbed with soft fiber brown wool, or washed with 1-29cg/cmz pressure water or low-pressure steam. The use of acetylene flame heating is prohibited under any circumstances. Before maintenance, the gasket to be replaced must be carefully inspected. The surface should be smooth, consistent in thickness, free of transverse cracks, no bubbles, no gaps, no aging, no signs of overlap and butt joints. First remove the pipe, and then loosen the fixing bolts in the diagonal direction. The above is a brief description of the common problems and solutions for the maintenance of imported brand plate heat exchangers, and interested friends can learn about it. If you want to know more about the maintenance plan, price, process, etc. of the plate heat exchanger, please go to the official website of Diguang Heat Transfer to learn more.
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