The stainless steel plate heat exchanger is composed of many stamped and formed stainless steel thin plates, which are combined by a guide rod and a pressing device at both ends through a gasket. The number of plates in the middle of the heat exchanger can be adjusted freely according to the production conditions. The cold and hot fluids convect each other on both sides of the thin-walled heat transfer plate for heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and lightweight structure, small footprint, convenient installation and cleaning, wide application, long service life and so on. However, stainless steel plate heat exchangers also have disadvantages.
(1) The plate heat exchanger has thin plates and low pressure bearing capacity. The contact points between the corrugated plates are mutually supportive heat exchangers. If the age of use is long, the contact point will be easily pressed into a pit after the pressing size exceeds the required size for installation, and a perforation will be formed later, so that the plate is scrapped.
(2) The distance between the plates is narrow, the liquid film is thin, and the evaporation speed is fast.
If high-temperature steam and liquid materials are used as heat and cold media for heat exchange, in the case of sudden cut-off of materials, the phenomenon of steaming and coking is prone to accelerate the damage of sealing gaskets between plates. The coking material will cause the cold material passage between the plates to be blocked, affecting the use of the equipment and causing loss to production.
(3) The pressure loss per unit length is large. Because the gap between the heat transfer surfaces is small and the heat transfer surfaces have irregularities, the pressure loss is greater than that of a conventional smooth tube.