Plate heat exchanger is an ideal equipment for liquid-liquid and liquid-steam heat exchange. It has the characteristics of high thermal efficiency, small heat loss, compact and light structure, small floor area, convenient installation and cleaning, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, the floor area is one third of that of the tubular heat exchanger, and the heat recovery rate can be as high as 90%. Plate heat exchanger is widely used in metallurgy, petroleum, chemical industry, food, pharmaceutical, shipping, textile, papermaking and other industries. It is an excellent equipment for heating, cooling, heat recovery and rapid sterilization.
The whole machine is equipped with two kinds of common structure (not often used for dismantling and washing conditions) and suspension structure (used for working conditions with frequent dismantling and washing). The common structure is composed of herringbone corrugated plate, sealing gasket, pressing plate, upper and lower positioning bolts, compression bolts and other main parts. The suspension structure is composed of herringbone corrugated plate, sealing gasket, fixed pressing plate, intermediate plate, movable pressing plate, bracket, upper and lower positioning beam, compression bolt and other main parts.
Due to the special function of the corrugated surface of plate heat exchanger, the fluid flows along the narrow and curved channel, and the direction of its velocity constantly changes. As a result, the fluid stirs up strong end movement at a small flow rate (RC = 200), thus accelerating the destruction of the fluid boundary layer, strengthening the heat transfer process, effectively improving the heat transfer capacity, and making it have compact structure and gold It is characterized by low consumption, large operation flexibility, small heat loss, convenient installation, inspection and cleaning, strong corrosion resistance and long service life. The process of heat exchanger is composed of many plates assembled according to a certain process and the technical requirements of the demander. During assembly, plate A and plate B are arranged alternately, and mesh channels are formed between the plates. Four corner hole shaped distribution pipes and converging pipes are formed between the plates. The sealing gasket seals the hot and cold medium in the heat exchanger, and reasonably separates the hot and cold media without mixing. In the channel, the hot and cold fluids flow alternately, and the liquid can flow forward. In the process of flow, the hot and cold fluids exchange heat through the plate wall. There are many process combinations of plate heat exchanger, which are realized by different reversing plates and different assemblies. The flow combination forms can be divided into single process, multi process, vapor-liquid exchange process and mixed process. The process combination of heat exchanger should be selected according to the process conditions.
