Protection of graphite heat exchanger application
1.When operating, it should prevent sudden changes in temperature and pressure, as well as over-temperature and over-pressure phenomena. When the pressure of the conveyed medium exceeds the operating pressure of the equipment, a safety valve should be set at the inlet access pipe of the medium to reduce the pressure. To prevent the strong impact of steam when steam heating, the valve should be slowly opened, gradually adjusted to the maximum or minimum, the temperature is slowly raised during the operation of the equipment, when the graphite parts tend to be uniform in temperature, and then slowly increase the pressure until it reaches the normal operating pressure, the operation of the preheating process is very important.
Operation steps: The cold carrier (material medium) should be passed first, and the heat carrier (steam or hot water) should be ventilated after the equipment is fullWhen stopping, the heat carrier (steam or hot water) should be stopped first, and the cold carrier (material medium) should be stopped after the equipment is cooled.
2.Check the acidity and alkalinity of the condensate from time to time, and regularly analyze the material composition of the pipeline and shell process to determine whether there is a series of leaks.
3.Clean up debris in the process pipeline before start-up to prevent blocking the graphite pores. Reduce the number of times the equipment is turned on and stopped as much as possible to prolong the service life of the equipment. When the heat transfer of the equipment can be reduced, it should be stopped and checked. If the equipment is severely scaled, it can be cleaned by appropriate physical or chemical methodsIf the pipe is blocked by crystals, it can be heated and melted for cleaning, and because graphite is brittle material, it is forbidden to use mechanical treatment.
4.When welding on the housing of the equipment, it is necessary to pass the cooling water through the shell to the specified direction before proceeding. The device shall not be forced when receiving the flange connection, and the bolt should be operated symmetrically and evenly;Stress compensation equipment should be installed on the pipeline connected with the graphite receiving and lower head.
5.The highest (low) part of the shell is provided with an exhaust (net) pipe, and the valve should be installed when the device is installed, and then the exhaust (net) pipe is connected, and it is forbidden to blind death with a blind plate. Before the equipment starts to be used, the evacuation valve at the top of the shell should be turned open, and then closed after the air in the shell is completely swept. During operation, it is necessary to frequently discharge non-condensable gas at the top of the shell and condensate at the bottom.