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Some of the applications where you may see the Graham Process Condenser being efficiently utizilied are:
Crude oil vacuum distillation
Refinery vacuum installation processes may elect to use a process condenser ahead of an ejector system. This will depend on the operating pressure of the process and the volatility of the overhead process vapors.
Graham has proven installation experience and has provided numerous systems throughout the world where vacuum condensation ahead of an ejector system is used. The overhead load from a distillation vessel is a mixture of complex hydrocarbons, steam, and a large volume of non-condensable gases. The application is sophisticated due to the complex vapor-liquid equilibrium calculations and the design of the process condenser must minimize pressure drop. By keeping pressure drop to a minimum, condensation efficiency is maximized and the size and operating cost of the energy-intensive ejector system are kept to a minimum.
Plastics, resins and fibers
In the manufacture of plastics, resins, and fibers, or other petrochemical processes, there often is a requirement for a process vacuum condenser between the vacuum vessel and vacuum producing equipment. These applications often involve high vacuum with large volumes of condensable vapors that are to be condensed in the process condenser. Normally, non-condensable gas flow rate is not too significant, but the challenge is to minimize pressure drop and maximize hydrocarbon condensation. The loading may contain hydrocarbons that have high freeze point temperatures and the tube wall must be maintained above the freeze point.
Graham has specialized designs where the vacuum condenser will mount directly atop the vacuum vessel. This minimizes pressure drop, thus improving condensation in the condenser and reducing the size of vacuum producing equipment.
Removing process vapors entirely in the process condenser and before they can enter the vacuum producing equipment offers significant advantages. The Graham ECOfreeze System has two process condensers; one operates in an ice-building mode, while the other undergoes a defrosting. By trapping the process vapors in the condenser as a solid it results in the vacuum equipment handling non-condensable gas only. This will significantly reduce the size of the vacuum producing equipment and minimize wastes produced by the vacuum system.
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