Effect of plate material on heat transfer performance of plate heat exchanger

Plate heat exchanger is mainly composed of two parts: the frame and the plate, and the plate heat exchanger has reverse flow, parallel flow and mixed flow pattern. In order to better improve the heat transfer efficiency of plate heat exchanger, it is a good way to determine the inlet and outlet pipe position. Single plate heat exchanger flow layout of the inlet and outlet pipe should be arranged on the side of the end plate fixed plate heat exchanger, import and export position shall be hot fluid progress under the cold fluid inlet on the arrangement, in order to reduce influence of residence zone.

Thin rectangular channel forming plate, mainly for heat exchange by half, has the characteristics of high heat transfer efficiency, small heat loss, compact structure, small occupied area, convenient installation and cleaning, wide application, long service life etc.. To improve the method of heat exchanger with logarithmic mean temperature difference, but also can improve the heat transfer efficiency, and the best is possible using the reflux or mixed flow close to the upstream, as far as possible to improve the hot side of the fluid temperature, reduce the cold side temperature of fluid. Under the same working condition, the average temperature difference is the biggest and the minimum flow is the lowest, and the mixed flow pattern is between the two.

Heat exchanger material quality control is the key to ensure the plate, a sealing gasket, a pressing plate, a middle baffle plate, clamping bolt, flange and take over the main parts such as welding materials and the authenticity and traceability, in order to ensure the quality of products, service life and safety and reliability. In addition, the selection of materials should be economical and reasonable.

The material of the plate has an important influence on the performance, service life, working conditions and sheet forming quality of plate heat exchanger. Material quality control mainly includes two aspects:

(1) the chemical composition, mechanical properties and other technical requirements of the materials shall comply with the relevant standards;

(2) based on the material properties and the applicable scope, correct and reasonable selection, which must consider the properties and operating conditions of heat transfer media (including chloride content and pH value size, operating temperature, pressure, space operation or continuous operation, etc.) and molding processing performance and corrosion resistance of materials etc.. The main materials used in plate are austenitic stainless steel, titanium and titanium alloy, nickel and nickel alloy and copper and other four kinds of cold-rolled sheet.