The main role of the plate heat exchanger is the frame and the plate. The material of the heat exchanger plates is composed of thin plates with different corrugations, and the plates play a key role when the fluid flows. The frame is composed of fixed compression plates and movable compression plates. Because of these frames, the plate can be operated stably, and the pressure drop will not be too fast or too slow. The plate heat exchanger will leak out during use. What causes the leak?
The reasons for the leakage of the plate heat exchanger: ①The clamping size is not in place, the size is uneven everywhere (the size deviation should not be greater than 3 mm) or the clamping bolts are loose. ② Part of the gasket is out of the sealing groove. There is dirt on the main sealing surface of the gasket, the gasket is damaged or the gasket is aging. ③ The plate is deformed, and the assembly misalignment causes the running mat. ④ There are cracks in the sealing groove of the plate or the second sealing area.
Treatment method for external leakage of plate heat exchanger: ① In the non-pressure state, re-clamp the equipment according to the clamping size provided by the manufacturer. The size should be uniform, the deviation of the compaction size should not exceed ±0.2N (mm) (N is the total number of plates), and the parallelism between the two compaction plates should be kept within 2 mm. ② Make a mark on the leaking parts, then disassemble the heat exchanger and investigate and solve them one by one, and reassemble or replace the gaskets and plates. ③ Disassemble the heat exchanger to repair or replace the deformed part of the plate. When there is no spare part for the plate, the plate at the deformed part can be temporarily removed and then reassembled for use. ④ When reassembling the disassembled plates, clean the plate surface to prevent dirt from adhering to the gasket sealing surface.