Heat exchanger is the key equipment for rational utilization and energy conservation and development of new energy, and has a wide range of applications. At present, in many application fields, plate heat exchangers have gradually replaced shell-and-tube heat exchangers, taking advantage of the unique advantages of plate heat exchangers.
1. In the evaporation concentration process of papermaking, food, alcohol, etc., since one side of the process contains fibers, particles or high-viscosity media, a larger channel flow section 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 prompted related industries to develop new heat exchangers. At present, plate heat exchangers have been widely used in the above processes.
2. The evaporator and condenser of the heat pump unit. Heat pump unit is a key equipment widely used in air conditioning system and heat recovery system
Plate Heat Exchanger system. These applications place the following requirements on heat pumps: low weight, small size (assembled), good pressure resistance and good low temperature resistance. And has a high sealing performance. The shell-and-tube heat exchangers used in the past have difficulty meeting the above requirements. QH
Brazed plate heat exchanger can not only save the space of the heat pump, but also reduce the cost of the refrigerant and the leakage of the refrigerant, so it is widely used as the evaporator and condenser in the heat pump unit. In addition, they serve as economizers and oil coolers. It is also used as a heat exchanger for solutions in absorption refrigerators.
3. In the cooling process of sulfuric acid industry, soda making industry and oil refining industry, the plate heat exchanger replaces the
Shell And Tube Heat Exchanger.
4. Catalytic reforming units, plate-shell heat exchangers, all-welded plate air preheaters and all-welded plate economizers in the oil refining industry, and heat recovery devices for gas heat, electricity, and cooling triple heating have basically replaced Shell and tube heat exchanger.
High heat transfer coefficient: When the Reynolds number (Re) is low, the medium flowing in the plate pack will form turbulent flow, and the smooth plates are not easy to generate dirt, so the heat transfer efficiency is very high. When exchanging heat with water, the heat transfer coefficient of the plate heat exchanger can reach more than 6000w/m2℃, which is 3-8 times that of the shell-and-tube heat exchanger.
High heat recovery rate: Due to the high heat transfer coefficient, excellent flow characteristics and complete counterflow, very low heat transfer temperature differences can be selected, so it is very suitable for heat exchangers with single plate recovery of low energy reaching more than 90% The heat recovery rate is economically feasible.
Strong Adaptability: The collapsible plate heat exchanger has unparalleled adaptability. After installation, the group of metal plates can be increased or decreased to meet the process requirements of expansion and contraction.
Low stagnation flow: Due to its small flow path and small stagnation flow, it can start up quickly, react quickly when the control operation is changed, and greatly reduce the weight of the equipment.
Easy Maintenance: The plate is designed with no dead zones 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, alkali metals and salts, heating, cooling and condensation of various organic solvents.
Petroleum industry: heating and cooling of various petroleum products.
Metallurgical industry: various water cooling, oil cooler and waste heat recovery, dilute alumina cooling, electrolyte cooling and heating.
Food and beverage industry: heating, cooling, evaporation, crystallization and sterilization in various food, beverage, juice, beer and other processes.
Central Cooling System: Turbine Oil Cooler, Bearings, Vacuum Pump, Auxiliary Equipment Cooler, Sea Water Desalination.
January 09, 2023
