Precautions for operation and maintenance of plate heat exchanger_
685 Sometimes when we use the plate heat exchanger, we will find that the equipment is malfunctioning. If we can solve it by ourselves, that would be great; if it can’t be solved, we must contact professional maintenance personnel to check and carry out as soon as possible. Repair processing, so as not to affect the work progress. Below, the editor of Diguang will tell you about the precautions for the operation and maintenance of plate heat exchangers, and interested friends can find out. Plate heat exchanger operation 1. During the operation, the pressure should be stable to avoid sudden high and low. 2. During operation, if leakage is found, it should be repaired and tightened by 2 to 3 mm in the pressure relief state before running. 3. When using over 150℃ or corrosive and flammable media, it is recommended to add thin iron protective covers on both sides of the plate bundle to prevent injury and heat loss. Plate heat exchanger stops 1. When stopping, slowly close the fluid port valves on both sides of the heat exchanger to make the pressure on both sides drop slowly at the same time. (Close the inlet valve first, then close the outlet valve). If parking for a long time, empty the remaining liquid and loosen the tie rod nut (1.1L). 2. It is especially emphasized that the opening and closing of the valve should be carried out slowly except in an accident state. Especially when the valve is closed to stop the fluid flow, because the fluid suddenly stops flowing, an impact pressure that exceeds the normal pressure may be several times. 3. For heat exchangers that are out of service in winter, the medium in the equipment should be discharged in time or other anti-freezing measures should be taken to avoid damage to the equipment. Newly installed equipment and heat exchangers that have been disassembled and repaired or replaced with plates shall be re-hydrostatically tested. Water for hydrostatic test, water temperature ≥5℃. The hydraulic test is carried out on one side. When the test pressure is ≤0.1MPa, the pressure is slowly increased to the specified pressure. Hold the pressure for 30 minutes, and no leakage is qualified. When the test pressure is greater than 0.1MPa, slowly increase the pressure to one-half of the specified test pressure. After maintaining the pressure for 10 minutes, release the pressure, change to the other side, slowly increase the pressure to one-half of the test pressure, and hold the pressure for 10 minutes , Then slowly increase to the specified pressure, hold the pressure for 30 minutes, release the pressure and try the other side again, slowly rise to the specified test pressure, and hold the pressure for 30 minutes without leakage as qualified. The hydraulic test pressure is 1.25 times the design pressure. If leakage is found, press it for another 2 to 3 mm and try the pressure again according to the specific situation. Precautions for plate heat exchanger maintenance: The air in the equipment must be drained before boosting. No overpressure test is allowed. The nuts should be tightened evenly. It is forbidden to compress the plate in the equipment with the L value less than Lmin. Before driving, carefully check whether the inlet and outlet pipelines and switches of the plate heat exchanger meet the requirements, and whether the compression size between the two plates meets the specified value. Turn on the outlet of the plate heat exchanger, then turn on the inlet of the equipment, slowly increase the pressure and temperature, in order to stabilize the operation, adjust the fluid on both sides as much as possible. According to the inlet and outlet pressure and temperature instructions, the valve is opened to the predetermined process parameters to maintain stable operation. The above is the introduction to the precautions for the operation and maintenance of the plate heat exchanger, I hope it will be helpful to you. For more knowledge about plate heat exchanger maintenance, please pay attention to the official website of Diguang!