Plate-fin heat exchangers have a large adaptability and can be used for heat exchange between various fluids such as gas gas, gas liquid, and liquid liquid. Through the arrangement and combination of various flow channels, they can adapt to different heat exchange conditions such as countercurrent, cross flow, multi stream, and multi pass flow.
The cold section of a reversible heat exchanger generally involves the heat transfer between four streams of cold fluid (oxygen, pure nitrogen, dirty nitrogen, and circulation) and one stream of hot fluid (air). The flow rate and density of each stream of fluid are different, and their channel numbers are also different. During the assembly of the heat exchanger, the channels of the cold and hot fluids are arranged alternately according to the number of channels of different fluids. At both ends of the channel, guide vanes are used to change the flow direction of the fluid, concentrating the outlet and inlet of the same stream of fluid on one side respectively. For example, air and dirty nitrogen are located on the upper and lower sides, while oxygen, pure nitrogen, and circulation are located on the left and right sides.
Generally, cold and hot fluids are arranged in a countercurrent or cross flow manner. Then connect the head, centralize the channels of the same fluid, and weld the corresponding pipes to achieve heat exchange between several streams of air.
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