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What should I pay attention to when using a graphite heat exchanger?
Release time:
2021-10-26
Before starting the graphite heat exchanger, clean the debris in the process pipe to prevent the graphite air holes from clogging, minimize the number of equipment stops, and prolong the service life of the equipment, and stop checking the equipment when the heat transfer is reduced. If the equipment is seriously contaminated, it can be cleaned by appropriate physical or chemical methods. If there are crystals clogged in the pipe, it can be cleaned by heating and melting. Since graphite is a brittle material, mechanical methods are strictly prohibited. The exhaust (cleaning) pipe is installed in the high (low) part of the housing. When installing, the valve should be installed, and then connect the exhaust (cleaning) pipe, it is strictly prohibited to blindly use the blind dead. Equipment first use
Graphite heat exchanger use precautions:The use of the process is strictly prohibited over-temperature, over-pressure operation, to avoid sudden changes in temperature and pressure, the cut-off valve should be opened slowly, and gradually adjust the size. Avoid the violent impact of steam when heating, the equipment runs slowly warming up, when the temperature of the graphite parts become uniform, slowly increase the pressure until it reaches the normal working pressure, the operation of the thermal process is very important. Operation:Introduce the cold carrier (material medium) first, introduce the heat carrier (steam or hot water) after the equipment is full; when stopping, the heat carrier (steam or hot water) should be stopped, and then the equipment should be cooled, the cold carrier (material medium) should be checked at any time to check the pH value of the condensate, and the material composition of the tube and shell processes should be analyzed regularly to verify whether cross-leakage occurs.
Before starting the graphite heat exchanger, clean up the debris in the process piping to prevent the graphite air holes from clogging, minimize the number of equipment stops, and prolong the service life of the equipment, and stop checking the equipment when the heat transfer is reduced. If the equipment is seriously contaminated, it can be cleaned by appropriate physical or chemical methods. If there are crystals clogged in the pipe, it can be cleaned by heating and melting. Since graphite is a brittle material, mechanical methods are strictly prohibited. The exhaust (cleaning) pipe is installed in the high (low) part of the housing. When installing, the valve should be installed, and then connect the exhaust (cleaning) pipe, it is strictly prohibited to blindly use the blind dead. Before the equipment is used for the first time, the drain valve at the top of the shell should be opened and closed. When the air in the spare shell is exhausted, the non-condensable gas at the shell side and the condensate at the bottom must be discharged frequently during operation.
The larger the particle size of the graphite matrix, the lower the packing density of the material, the lower the mechanical strength, the larger the pores between the particles, the more through holes that may be exposed when drilling, the porosity will increase, and in order to achieve the desired densification, the dosage of impregnating agent will be increased, which will affect the quality of impregnation and the thermal conductivity of impermeable graphite. The higher the density, the higher the mechanical strength. Therefore, the use of substrates with high packing densities (fine particles, class B) and the cessation of processing and consumption after impregnation and heat treatment provide high quality stability and safety in application. Graphite impregnation agent to fill the voids in the graphite substrate, the type of impregnant will directly affect the corrosion resistance of impermeable graphite, the amount of impregnation will affect the temperature of impermeable graphite and the level of corrosion resistance, impregnation of a large vacuum and high pressure can reduce the number of times of impregnation, the heat transfer effect is better than the traditional impregnation process (three times impregnation, three times heat treatment).
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