The heat exchanger is a pivotal equipment for fair utilization and energy saving, and development of new energy, with a wide range of applications. At present, in many applications, plate heat exchangers have gradually replaced tube and shell heat exchangers. The unique advantages of plate heat exchangers are exhibited.
1. During the evaporation and concentration process of papermaking, food, alcohol, etc., because one side of the process contains fibers, particles, or high-viscosity media, a smooth passage of a large channel is required. In the past, only shell-and-tube heat exchangers could be used, but the shortcomings of frequent cleaning and difficulty in cleaning after clogging have prompted related industries to develop new types of heat exchangers. At present, the plate heat exchanger has been widely used in the above process, in which the black liquor concentration device has become a stereotyped product.
2. In the cooling process of sulfuric acid industry, alkali production industry and oil refining industry, plate heat exchangers have replaced tube and shell heat exchangers.
3. The catalytic heavy beam device in the oil refining industry, the plate and shell heat exchanger, the fully welded plate air preheater and the fully welded plate energy-saving device used in the heat recovery device of the gas-fired heat-electricity triple supply have basically replaced Shell and tube heat exchanger.
High heat transfer coefficient: because the moving medium in the plate group can form turbulent flow at a low Reynolds number (Re), and the smooth plate is not prone to natural fouling, so it has a very high heat transfer efficiency, in general water In the heat exchange with water, the heat transfer coefficient of the plate heat exchanger can reach more than 6000w / m2 ℃, which is 3-8 times higher than that of the shell and tube heat exchanger.
High heat recovery rate: because of the high heat transfer coefficient, excellent flow ratio characteristics and complete reverse activity, the heat transfer temperature difference can be selected very low, so it is very suitable for low-level energy heat recovery, using a single plate heat exchanger to reach 90% The above heat recovery rate is economically feasible.
Great adaptability: Foldable plate heat exchanger has unmatched adaptability. After installation, the metal sheet group can be increased or decreased to adapt to the process requirements of expansion and contraction.
Low stagnation flow: Because of its small flow path and small stagnation flow, it can start quickly, respond quickly when the control operation changes, and greatly reduce the weight of the equipment.
Convenient maintenance: The design of the plate makes it free of dead corners, so it can be chemically cleaned on site without disassembly. The removable plate heat exchanger can also be easily opened for thorough mechanical cleaning.
Common industrial applications of plate heat exchangers
Chemical industry: heating, cooling, evaporation and condensation of various inorganic acids, alkalis and salts, heating, cooling and condensation of various organic solvents.
Petroleum industry: heating and cooling of various oil products.
Metallurgical industry: all kinds of water cooling, oil cooler and waste heat recovery, aluminum acid cooling, electrolyte cooling and heating.
Food and beverage industry: heating, cooling, evaporation, crystallization, sterilization in various food, beverage, fruit juice, beer and other technological processes.
Central cooling system: turbine oil cooler, bearing, vacuum pump, auxiliary equipment cooler, seawater desalination.