The plate heat exchanger is composed of a set of corrugated stainless steel metal plates with holes in the corners of the heat transfer plate for the passage of two heat transfer fluids. The tube heat exchanger is also made of stainless steel. A thick tube with a larger diameter is equipped with a number of small tubes, which are fixed on the tube plates at both ends. So what is the difference between the structure and performance of the plate heat exchanger and the tube heat exchanger?
(1) Application occasions. Plate heat exchangers are generally used for pasteurization. After the materials are pasteurized by the plate heat exchanger, they will kill pathogenic and harmful bacteria and inactivate some enzymes. The products must be stored under refrigerated conditions. Tubular heat exchangers generally apply ultra-high temperature instantaneous sterilization, which is maintained at this temperature for a certain period of time to achieve commercial aseptic level, and then the product is filled in aseptic packaging containers under aseptic conditions.
(2) In terms of volume. The plate heat exchanger is composed of a set of stainless steel heat transfer plates clamped in the frame. It has a compact structure and can accommodate a larger heat transfer area in a smaller working volume. It organically combines the heating section, cooling section and heat recovery section. The tube heat exchanger with the same heat transfer area has a larger volume.
(3) Working hours and cleaning times. Since the diameter of the tube is larger than the distance between the heat transfer plates, the tube heat exchanger does not need to be shut down frequently for cleaning after it is turned on. Tubular heat exchangers run longer than plate heat exchangers and have greater production capacity.
(4) Heat recovery. Both plate heat exchangers and tube heat exchangers have heat recovery sections. The plate heat exchanger is in the heat recovery section, and the hot material after heat sterilization preheats the cold material that has just entered the heat exchanger while being cooled by itself. This process is called heat recovery. The heat recovery rate of the plate heat exchanger can reach 94%. The heat recovery section not only saves heat, but also reduces the consumption of cooling water. The hot material heated and sterilized by the tube heat exchanger transfers heat to the water first, and then to the material, and the heat recovery rate is low.