Views:0 Author:Site Editor Publish Time: 2020-04-20 Origin:Site
According to different heat transfer methods, heat exchangers can be divided into three types: mixed type, regenerative type and partition type.
A hybrid heat exchanger is a heat exchanger that exchanges heat by direct contact and mixing of cold and hot fluids, and is also called a contact heat exchanger. Because the two fluids must be separated in time after mixing and heat exchange, this type of heat exchanger is suitable for heat exchange between gas and liquid. For example, in the cooling towers used in chemical plants and power plants, hot water is sprayed from top to bottom, and cold air is sucked from bottom to top. Contact each other for heat exchange, the hot water is cooled, and the cold air is heated, and then it can be separated in time by the density difference of the fluid itself.
The regenerative heat exchanger is a heat exchanger that uses cold and hot liquid to alternately flow through the surface of the regenerator (filler) in the regenerator to exchange heat, such as a regenerator that preheats air below the coke oven. This type of heat exchanger is mainly used to recover and utilize the heat of high-temperature exhaust gas. The same kind of equipment for the purpose of recovering cold capacity is called cold storage, which is mostly used in air separation devices.
The cold and hot fluids of partition wall heat exchangers are separated by solid partition walls, and heat exchangers that exchange heat through the partition walls, so they are also called surface heat exchangers. This type of heat exchanger is the most widely used.
The partition wall heat exchanger can be divided into tube type, plate type and other types according to the structure of the heat transfer surface. The tube heat exchanger uses the surface of the tube as the heat transfer surface, including a coiled tube heat exchanger, a sleeve heat exchanger, and a shell and tube heat exchanger; the plate surface heat exchanger uses the plate surface as the heat transfer surface, including Plate heat exchangers, spiral plate heat exchangers, plate fin heat exchangers, plate shell heat exchangers and umbrella plate heat exchangers, etc; other types of heat exchangers are heat exchangers designed to meet certain special requirements , Such as scraped surface heat exchanger, turntable heat exchanger and air cooler.