Jacketed heat exchanger: This heat exchanger is made by installing a jacket on the outer wall of the container, and the structure is simple; but its heating surface is limited by the wall of the container, and the heat transfer coefficient is not high. To improve the heat transfer coefficient and make the kettle The liquid is heated evenly, and a stirrer can be installed in the kettle. When cooling water or no phase change heating agent is passed into the jacket, a spiral baffle or other measures to increase turbulence can also be installed in the jacket to improve the clamping The heat supply coefficient on one side of the jacket. To supplement the deficiency of the heat transfer surface, a coil can also be installed inside the kettle. Jacketed heat exchangers are widely used for heating and cooling of the reaction process.
Immersion snake tube heat exchanger: This heat exchanger is a metal tube bent into various shapes suitable for the container, and immersed in the liquid in the container. The advantage of the snake tube heat exchanger is that the structure is simple and can withstand high pressure It can be made of corrosion-resistant materials; its shortcomings are the low degree of liquid turbulence in the container and the small heat supply coefficient outside the tube.
Thermal coefficient, agitator can be installed in the container.
Spray heat exchanger: This heat exchanger is to fix the heat exchange tubes in a row on the steel frame, the hot fluid flows in the tube, and the cooling water is evenly poured from the upper spray device, so it is also called spray cooling The outside of the tube of the spray heat exchanger is a layer of liquid film with a high degree of turbulence, and the heat supply coefficient outside the tube is much larger than that of the immersion type. In addition, most of this type of heat exchanger is placed in the place of air circulation. The evaporation of the cooling water also takes away some of the heat, which can play a role in reducing the temperature of the cooling water and increasing the driving force for heat transfer. Therefore, compared with the immersion type, the heat transfer effect of the spray heat exchanger is greatly improved.
Sleeve type heat exchanger:Sleeve type heat exchanger is a concentric sleeve made of straight tubes with different diameters and connected by U-shaped elbows. In this heat exchanger, a fluid passes through the tube and the other For a fluid passing through the annulus, both can obtain a higher flow rate, so the heat transfer coefficient is larger. In addition, in the casing heat exchanger, the two fluids can be pure countercurrent, and the logarithmic average driving force is larger. The casing heat exchanger is simple in structure, can withstand high pressure, and is also convenient to apply (the number of pipe sections can be increased or decreased according to needs). Especially because the casing heat exchanger also has a large heat transfer coefficient, a large heat transfer driving force and can withstand high pressure. The advantages of the heat exchanger used in the ultra-high pressure production process (for example, the high-pressure polyethylene production process with an operating pressure of 3000 atmospheres) are almost all sleeve type.
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