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Graphite heat exchanger use to pay attention to these
Release time:
2021-06-03
Graphite heat exchanger use precautions: the use of the process is strictly prohibited over-temperature and over-pressure operation, to avoid sudden changes in temperature and pressure, the cut-off valve should be opened slowly, and gradually adjust the size. Steam heating to avoid the violent impact of steam, slowly increase the temperature during the operation of the equipment, 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 process: first pass the cold carrier (material medium), after filling the equipment pass the hot carrier (steam or hot water); stop the hot carrier (steam or hot water) should be stopped, and then cool the equipment, the cold carrier (material medium) not
Graphite heat exchanger use precautions: the use of the process is strictly prohibited over-temperature and over-pressure operation, to avoid sudden changes in temperature and pressure, the cut-off valve should be opened slowly, and gradually adjust the size. Steam heating to avoid the violent impact of steam, slowly increase the temperature during the operation of the equipment, 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 process: first pass the cold carrier (material medium), after filling the equipment, pass the hot carrier (steam or hot water); stop the hot carrier (steam or hot water) should be stopped, and then cool the equipment, the cold carrier (material medium) from time to time to check the acidity and alkalinity of the condensate, and regularly analyze the composition of the material on the tube side and the shell side, to verify that cross-leakage occurs.
Graphite heat exchanger before starting work to clean up debris in the process piping to prevent graphite pore clogging, minimize the number of times the equipment is parked to extend the service life of the equipment. When the heat transfer of the equipment is reduced, it should be shut down for inspection. If the equipment is seriously contaminated, it can be cleaned by appropriate physical or chemical methods; if there are crystals clogged in the tubes, they can be heated and melted for cleaning. Since graphite is a brittle material, the use of mechanical methods is strictly prohibited. The high (low) part of the shell is equipped with an exhaust (clean) pipe, a valve should be installed during the installation, and then the exhaust (clean) pipe should be connected, and it is strictly prohibited to use a blind plate to blindly die, before the initial use of the equipment, the top of the casing should be opened and closed to the casing top of the drain valve, to be the casing air is discharged, the operation of the casing must be discharged frequently shell range of non-condensable gases and condensate at the bottom.
The larger the particle size of the graphite substrate, the lower the bulk density of the material, the lower the mechanical strength, the larger the holes between the particles, the more through holes may be exposed when drilling, and the more the porosity will increase. In order to achieve the required densification, the amount of impregnant is increased, which affects the impregnation quality and the thermal conductivity of impermeable graphite, and the higher the density, the higher the mechanical strength. Therefore, the use of substrates with high packing density (fine particles, class B), stopping processing and consumption after impregnation and heat treatment, high quality stability and safety, and good application results. Graphite heat exchanger 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, high pressure, which reduces the number of times of impregnation, the effect of heat exchange is better than the traditional impregnation process (3 times impregnation, 3 times heat treatment).
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No. 16, Jiangtong North Road, Gangzha District, Nantong City, Jiangsu Province
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