A wall type heat exchanger that forms a heat transfer surface with a sheet. This type of heat exchanger is compact, the volume of heat transfer per unit volume is larger. The main types are:
① plate fin type heat exchanger by a cold and hot fluid inlet and outlet in the collector box in the composition of the heat exchanger plate. The board is composed of a plate and a corrugated fin, and is brazed and fixed. The hot and hot fluid flows through the heat transfer on both sides of the plate, and the fins increase the heat transfer area and promote the turbulence of the fluid and enhance the equipment. Plate fin heat exchanger structure is very compact (heat transfer area of 4400m / m), heat transfer effect is good, and the use of pressure up to 15MPa. But its manufacturing process is complex, the flow path is small, the internal leakage is not easy to repair, and therefore limited to clean non-corrosive fluid, such as air separation with the heat exchanger. The spiral plate heat exchanger is made up of two parallel metal plates which keep a certain distance, and the cold and hot fluid flows in the spiral channel on both sides of the metal plate. This heat exchanger heat transfer coefficient is high (about 1 to 4 times higher than the shell and tube heat exchanger), the average temperature difference (due to cold and hot fluid can be used for complete countercurrent flow), flow resistance is small, easy to knot But difficult to repair. Use the pressure does not exceed 2MPa.
② flat plate heat exchanger by a certain shape of the corrugated sheet and sealing gasket to interact with each other, and with the frame clamping assembly. Cold and hot fluid flow in the flow path on both sides of the corrugated board, respectively, through the plate for heat transfer. Corrugated board is usually made of thickness of 0.5 ~ 3mm stainless steel, aluminum, titanium, molybdenum and other sheet made of red. Flat plate heat exchanger has the advantage of high heat transfer coefficient (about 2 to 4 times higher than the shell and tube heat exchanger), easy to wash and wash, and increase the number of plates to adjust the heat transfer area. Operating pressure is usually not more than 2MPa, the operating temperature does not exceed 250 ℃.
③ spiral plate heat exchanger from two to maintain a certain distance from the parallel plate made of metal, cold and hot fluid in the metal plate on both sides of the spiral channel flow. This heat exchanger heat transfer coefficient is high (about 1 to 4 times higher than the shell and tube heat exchanger), the average temperature difference (due to cold and hot fluid can be used for complete countercurrent flow), flow resistance is small, easy to knot But difficult to repair. Use the pressure does not exceed 2MPa.
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