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How do you overhaul a graphite heat exchanger?
Release time:
2022-02-24
Graphite heat exchanger maintenance is actually a systematic work, according to the classification of the medium of the heat exchanger, to develop a reasonable maintenance plan, measures and time limits, and according to the development of the maintenance plan and measures to implement carefully. Take the application of YKB round hole graphite heat exchanger in analyzing process as an example, calcium chloride solution mainly circulates in axial hole graphite heat exchanger. We know that calcium chloride solution is easy to precipitate, and as the temperature rises, when the concentration of calcium chloride solution reaches 50%, it is very easy to crystallize and plug the holes, which eventually leads to downtime.
Chemical companies in the planned shutdown overhaul, usually put too much effort on dealing with leakage points and equipment maintenance and operation, often ignoring the widely used, large number of graphite heat exchanger equipment, heat exchanger planned maintenance is very important to avoid shutdown accidents, in the past time, the chemical industry, a number of stopping accidents, resulting in huge losses. The huge economic losses still haven't sounded our alarm, and we still have little or no graphite heat exchanger maintenance in our overhaul program.
Graphite heat exchanger maintenance is actually a systematic work, according to the heat exchanger media classification, develop a reasonable maintenance plan, measures and time limits, and according to the development of maintenance plans and measures to implement carefully. Take the application of YKB round hole graphite heat exchanger in analyzing process as an example, calcium chloride solution mainly circulates in axial hole graphite heat exchanger. We know that calcium chloride solution is easy to precipitate, and as the temperature rises, when the concentration of calcium chloride solution reaches 50%, it is very easy to crystallize and plug the holes, which eventually leads to downtime.
Therefore, in order to ensure the concentration of calcium chloride and maintain safe operation, the temperature index of the analyzing process must be strictly controlled.
Pre-production maintenance:Thermal expansion and contraction phenomenon will occur when the temperature drops during the start and stop of the rainwater, therefore, before production and operation, the graphite heat exchanger pressure springs should be pressurized and imprisoned, and the size of each pressure spring on the top of the heat exchanger should reach 140mm, in order to avoid leakage at the internal and external seals of the heat exchanger, and to ensure the success of the start and operation.
Planned parking maintenance:Firstly, the calcium chloride solution in the system should be discharged from the lowest part of the system for recycling; after the discharge is completed, hot water should be added to the system, and the graphite heat exchanger should be flushed with a circulating pump cycle and run at least twice until the heat exchanger is discharged with clean water.
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