Plate heat exchangers have been widely used in many industries such as power engineering, shipping, metallurgy, petroleum, chemical, food and light industry. The surface of the plate heat exchanger has a compact structure and small gaps, so the heat transfer area per unit volume is increased, and its installation area is about 1/2 to 1/3 of the shell-and-tube type. When the volume of each shell is 1m3, its heat transfer area is about 80m2. Only the shell plate of the heat transfer plate of the plate heat exchanger is exposed to the atmosphere, therefore, the heat dissipation loss is negligible and no heat preservation measures are required. One of its features in terms of operation and maintenance is that it is more convenient to assemble and disassemble, and the plate can be removed for cleaning and replacement of washers only by loosening the compression bolts. So what are the temperature and pressure requirements of the plate heat exchanger?
The temperature, pressure and chemical stability that the gasket can withstand often become the temperature and pressure used and the allowable range of materials. Due to the small gap between the heat transfer surfaces and the unevenness on the heat transfer surface, the pressure loss is greater than that of the traditional smooth. The working pressure of the plate heat exchanger is lower.The fully welded plate heat exchanger does not use any non-metallic sealing materials, and can have higher temperature and pressure resistance. It can be applied to working conditions of 300℃ working temperature and 3.0Mpa pressure. The normal working temperature of the detachable plate heat exchanger is less than 150℃ (related to the performance of the sealing material), and the pressure is less than 1.6Mpa.