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Matters needing attention in the operation of graphite heat exchangers
- 2019-11-14-

Note for graphite heat exchanger : It is forbidden to operate at over-temperature or over-pressure during use, and sudden changes in temperature and pressure should be avoided. All valves should be slowly opened and gradually adjusted to the maximum or minimum. Avoid the severe impact of steam when steam is heated. Slowly increase the temperature during the operation of the equipment. After the graphite parts have reached an average temperature, increase the pressure slowly until it reaches normal operation. The operation of the pressure and warm-up process is very important. Operation process: the cold carrier (material medium) should be passed first, and the hot carrier (steam or hot water) should be passed after the equipment is full; the hot carrier (steam or hot water) should be stopped when parking, and the equipment should be cooled down before Stop the cooling carrier (material medium) from time to time to check the acidity and alkalinity of the condensed water, and regularly analyze the material composition of the tube side and the shell side to verify whether the leakage can occur.

The graphite heat exchanger clears the sundries in the process pipeline before starting to prevent the graphite pores from being blocked. Try to reduce the number of times the equipment is parked to extend the life of the equipment. When the heat transfer of the equipment can drop, you should park your car to check. If the scale of the equipment is serious, you can use appropriate physical or chemical methods to clean it; if the tube is blocked due to crystals, it can be heated and melted for cleaning. Because graphite is brittle material, it is forbidden to dispose by mechanical methods. The highest (low) part of the casing is provided with an exhaust (clean) pipe. When the device is installed, a valve should be installed and then connected to the exhaust (clean) pipe. It is forbidden to use a blind plate to blindly die. Before the equipment is initially used, the vent valve on the top of the casing should be opened, and the air in the casing should be completely cleaned before being closed. During the application process, the non-condensable gas at the top of the shell side and the condensate at the bottom must be discharged frequently.

The greater the granularity of the graphite base material, the smaller the data bulk density and the lower the mechanical strength. The larger the holes between the particles, the more through holes may be exposed when drilling the holes, and the porosity will increase. The amount of impregnating agent required to achieve the required density will increase, affecting the quality of impregnation and the thermal conductivity of impervious graphite. The higher the density, the greater the mechanical strength. Therefore, the high-density (fine particles, B-grade) base material is used to stop the dipping and thermal treatment of the equipment for processing and consumption, which has high quality stability and safety, and has a good application effect. Graphite heat exchanger impregnating agent fills the open space in the graphite base material. Different types of impregnating agent will directly affect the corrosion resistance of impervious graphite. Different amounts of immersion affect the temperature and corrosion resistance of impervious graphite. The vacuum degree of the impregnation is large, the pressure is high, the number of impregnations can be reduced, and the heat exchange effect is also superior to the traditional impregnation process (three-pass impregnation and three-pass heat treatment).

The company has formed a long-term good relationship with Jiangsu Meilan Chemical Co., Ltd., Sichuan Zhoulong Chemical Co., Ltd., Jiangsu Baju Pharmaceutical Co., Ltd., Nantong Nanhui Electronics Co., Ltd., and Jiangsu Zhoulong Chemical Co., Ltd. Partnership.