What is the impact on the coking unit of an increase in quench to the drum?
Answers
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13/08/2020
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A:
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
I assume you are talking about the water quench added during the offline cycle and not the distillate quench added to the outlet of coke drums. Increasing water quench will cool down the coke quicker, which can reduce the offline cycle time and allow an increase in feed rate. The increased quench may increase the initial vapor load on the closed blowdown system air coolers as more water vaporizes. More rapid cooling of the coke drums will also increase the thermal stresses in the coke drums, which can shorten the life of the drums. If the more rapid quench allows increased rate, this benefit normally more than offsets the negative impact on drum life from an economic perspective.
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