Plate heat exchanger is an efficient and compact heat exchange equipment. Due to the advantages of high heat transfer coefficient, small pressure loss, compact structure, and convenient maintenance, the application of plate heat exchangers has received increasing attention. The traditional bulk plate heat exchanger (removable plate heat exchanger), due to the limitations of its own structure, the operating pressure does not exceed 2.5M Pa, the operating temperature does not exceed 250 ℃, and the maximum assembly area is 2000 square meters. Therefore, in order to increase the temperature and pressure of the plate heat exchanger and expand its scope of use, a variety of welded plate heat exchangers have been developed, manufactured and used at home and abroad. The plate material of all-welded plate heat exchangers is usually austenitic stainless steel: 304, 304 L, 306, 316 L, 321, nickel-based alloys, and industrial pure titanium. The material only needs to have basic weldability and stamping properties, and can be used to make plate components. The thickness of the plate is usually 0.4～1.0 mm. What is the difference between a plate heat exchanger and a fully welded plate heat exchanger?
(1) The appearance of the heat exchanger
The most direct way of the detachable plate heat exchanger is that it can be disassembled, and the four inlet and outlet positions are all on the same side frame plate. The four ports of the fully welded plate heat exchanger are the up and down and left and right positions on the side. Because the welding process is used, the frame itself cannot be opened.
(2) Internal parts of the heat exchanger
The inside of the detachable plate heat exchanger is composed of heat exchanger plates and rubber gaskets. Due to the limited high pressure resistance, the thickness of the plates is usually 0.5mm. The inside of the fully welded heat exchanger eliminates the need for the sealing gasket, which is all welded from stainless steel plates, which are usually used for high temperature and high pressure conditions, so the thickness of the plates is 1mm.