Atmospheric distillation

Temperature measurement




Crude oil travels from the primary heat exchanger to the atmospheric distillation unit, where it is separated into various ”fractions” or “cuts”, such as fuel gases, LPG, naphtha, kerosene, diesel and fuel oil.
A boiler heats and vaporizes crude oil at the bottom of the distillation column. The vapor moves upwards, cooling as it rises, which causes the heavier compounds in the vapor to condense back into a liquid. However, the lighter “fractions” of crude remain vaporized and continue moving upwards where they cool further and condense, one fraction at a time.



Temperature measurements are necessary to monitor and control the temperature of the crude oil throughout the distillation column. Due to the high process temperatures, measurements are performed by TC-K sensors.
The temperature measurements are converted using multiple PR 6337D HART double channel DIN-rail mounted temperature transmitters. Highly accurate CJC compensation is achieved using the dedicated 5910Ex/5913Ex CJC connector. The 6337D is mounted in the IS area in an UL approved cabinet. Each 6337D is powered from the safe area using the double channel 9106B. To reduce cabling, the 9106B transmitters are mounted on the PR power rail system where one 9410 power control unit provides 24 VDC to the power rail while enabling global monitoring of any device faults.





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