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    Principle and structure of plate heat exchanger
    By a certain shape of the corrugated sheet and the sealing gasket are alternately stacked and assembled with the frame clamping. The cold and hot fluids flow through the flow channels on both sides of the corrugated plate, respectively, and undergo heat exchange via the plates. The corrugated plate is usually punched from a sheet of stainless steel, aluminum, titanium, molybdenum, etc. with a thickness of 0.5 to 3 mm. The advantage of the plate heat exchanger is that the heat transfer coefficient is high (about 2 to 4 times higher than the shell-and-tube heat exchanger), and it is easy to take apart and wash, and the number of plates can be increased or decreased to adjust the heat transfer area.

    The plate heat exchanger is mainly used for a central cooling system (hereinafter abbreviated as CCS), which centrally cools the cooling water used in the plant and serves as a cooler for bearing cooling water in a power plant. The capacity of the plate heat exchanger is related to the size of the plant, the process, etc. The cooling water volume ranges from thousands to tens of thousands of m3/h, and the large plate heat exchanger can reach several hundred thousand m3/h. CCS hopes to adopt as few as possible. A large number of plate heat exchangers are required for the processing of the number of units. In recent decades, LNG plants of many scales have been built in the Middle East. The use of past cooling tower cooling methods does not ensure the supply of water. Therefore, it is hoped that the use of plate heat exchangers will be changed. CCS method. In the past, power plants used S&T bearing cooling water, but through performance evaluation, plate heat exchangers were cost- and heat-transfer performance, so they needed to be replaced with plate heat exchangers.

    In the boiler installation project, the equipment that exchanges the boiler feed water with the heating heat network water is classified according to the medium that participates in the heat exchange, and is divided into a soda (type) heat exchanger and a water-water (type) heat exchanger, and the heat exchanger is The exchange method is divided into surface heat exchangers and hybrid heat exchangers. The plate heat exchanger is mainly composed of a heat transfer plate, a fixed cover plate, a movable cover plate, a positioning bolt, and a compression bolt. The gasket is sealed between the plate and the plate, and the inlet and outlet short pipes of the cold and heat medium are provided on the cover plate.

    The structure of the plate is many, and the upper and lower holes on the left side are connected with heating fluid and the upper and lower sides are connected with heated fluid. The process flow on both sides of the plate heat exchanger (heating side and heated side) is very flexible. Due to the different structure of the plate surface, the plate heat exchanger can make the fluid turbulent at low flow rate, thus greatly enhancing the heat transfer process. Therefore, the plate heat exchanger is a heat exchanger with high heat transfer coefficient, compact structure, large adaptability, convenient disassembly and washing, and material saving.
    Copyright: Wuxi Rongfeng Biological Engineering Co., Ltd.
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