Plate heat exchanger disassembly and maintenance steps and points for attention_
The 535 plate heat exchanger has been used for a long time, it will inevitably produce scale inside. If it accumulates to a certain thickness, it will affect the heat exchange effect of the equipment and cause damage to the plates. Once encountered this situation, we must seek the help of professional maintenance unit in time, let us understand the disassembly and maintenance steps and points of attention of the plate heat exchanger. Plate heat exchangers generally have been operating for five to six months during the heating period. The operating medium is softened water with a temperature of up to 140°C. Although it is water after softening treatment, it is inevitable that scale adheres to the surface of the plate. If the scale is thick to a certain level, it will not only affect the heat exchange effect, but also cause damage to the plates. Therefore, during the maintenance period, the plates must be disassembled and descaled. Check the fouling of the plates: check the fouling of the disassembled plates. If the fouling is fully covered with golden yellow and the fouling is serious, it is not easy to clean only by physical cleaning, so it must be cleaned by chemical cleaning. ; If the scale presents uneven light yellow, consider using physical cleaning methods. Chemical cleaning step 1: Pour a 5% concentration of safe descaling cleaning solution in a self-made cleaning tank and soak for 15 hours to ensure the soaking time. Too short and incomplete cleaning, too long will affect the life of the plate. Chemical cleaning step 2: Take out the soaked plates and rinse them with clean water on the edge of a soft brush. Physical cleaning step 1: Choose a high-pressure water gun of appropriate pressure according to the scale of the scale, and use the water gun to repeatedly flush with high pressure along the pattern of the plate to ensure that the stubborn scale is washed away. When using a high-pressure water gun, you must pay attention to safety: wear protective goggles and strictly abide by the safety operation specifications of the high-pressure water gun. Physical cleaning step 2: Lift the plates washed with a high-pressure water gun to two high and low chairs, one person washes with clean water, the other uses a soft brush to scrub, and the remaining scale is scrubbed. Step 1 of installing the board: Whether it is chemical cleaning or physical cleaning, the subsequent installation of the board is very important. Because it is necessary to check the damage of the gaskets of the plates during the installation process, it is necessary to check each plate and install one plate. If the inspection and replacement of the gasket is neglected, it will cause leakage during the pressure test operation of the plate heat exchanger. When the time comes, rework will waste time and labor, and may even delay the heating work. Plate installation step 2: There are more than 160 plates on each heat exchanger. On the basis of inspecting the gasket, multiple people cooperate to install each plate to ensure that the plates are installed in place and do not leak. Precautions for plate heat exchange maintenance All personnel should wear labor protection supplies. During the cleaning process, the plates should be handled with care to prevent hands and feet from being scratched. The above is all about the disassembly and maintenance steps of the plate heat exchanger and the main points of attention. I hope it will be helpful to you. If you want to know more about the maintenance methods, steps, precautions, etc. of plate heat exchangers, please follow the official website of Diguang Heat Transfer.