The plate heat exchanger is referred to as a plate heat exchanger, and its structure is shown in Figure 4-46. It is composed of a set of rectangular thin metal plates arranged in parallel and clamped and assembled on the support. The edges of the two adjacent sheets are lined with gaskets, which form a sealed fluid passage between the sheets, and the thickness of the channels can be adjusted by the thickness of the gasket. On each of the four corners of each plate, a circular hole is opened, two of which are in communication with the flow path on the plate surface, and the other two holes are not connected. Their locations are staggered on adjacent plates to form a two fluid passage, respectively. The cold and hot fluids alternately flow on both sides of the sheet, and heat exchange is performed through the sheet metal.
The plate is the core component of the plate heat exchanger. In order to make the fluid flow evenly across the surface of the plate, increase the heat transfer area, and promote the turbulence of the fluid, the plate surface is often punched into a corrugated shape with irregularities. There are dozens of corrugated shapes, and the commonly used corrugated shapes have horizontal corrugations and herringbone ripples. And arc-shaped corrugations, etc.
The advantages of the plate heat exchanger are compact structure, and the heat exchange area provided by the unit volume equipment is large; the assembly is flexible, and the number of plates can be increased or decreased according to the need to adjust the heat transfer area; the plate surface corrugation makes the cross section change complicated, and the fluid disturbance effect is enhanced. , has high heat transfer efficiency; easy to disassemble, is conducive to maintenance and cleaning. The disadvantage is that the throughput is small; the operating pressure and temperature are not limited by the performance of the gasket material. The plate heat exchanger is suitable for frequent cleaning, and the working environment is very compact. The working pressure is below 2.5 MPa and the temperature is between -35 °C and 200 °C.
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