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Plate heat exchangers are widely used in both civilian and industrial applications. To ensure their proper operation and prevent any abnormalities or damage during use, it is advisable to avoid using plate heat exchangers in the following heating scenarios. 1. Plate exchangers are not suitable for use at operating temperatures above 200°C. The design temperature of a plate heat exchanger is primarily determined by the temperature tolerance of the gaskets. The maximum operating temperature for nitrile rubber is below 110°C, for EPDM it is below 150°C, and for fluororubber it is below 180°C. 2. Fluids that tend to clog flow channels are not suitable for conventional channel heat exchange. The plate spacing in conventional plate exchangers is relatively small, typically ranging from 3 to 5 millimeters. If there are large solid particles, fibers, or other impurities in the heat exchange fluid, it can easily lead to blockages in the flow channels. In the presence of media containing particles or fibers, wide-channel plate heat exchangers can be used; the channel width can range from 6 to 16 mm. There are no contacts between the plates, and the S-shaped channels help to prevent fluid blockages. 3. Plate heat exchangers are not suitable for use at a standard pressure of 2.5 MPa. Plate heat exchangers are sealed using gaskets, and their sealing perimeter is quite long; the support at the secondary seals of the corner ports is poor, resulting in the gaskets not receiving sufficient compression force. Therefore, the maximum operating pressure for plate heat exchangers is only 2.5 MPa. During normal operation, it is necessary to regularly clean and maintain the heat exchanger to ensure its long-term usability.