(34e) Correct Problem Diagnosis Debottlenecks a Gas Plant with No Hardware Changes
AIChE Spring Meeting and Global Congress on Process Safety
Monday, March 27, 2017 - 3:50pm to 4:20pm
Pressure drop calculations, close design reviews, examination of operating charts, and gamma scans, led to the correct diagnosis that enabled debottlenecking the reboiler circuits and the entire gas plant with no hardware modifications. The desired steady state was established by an operation that temporarily generated higher liquid circulation and pressure drop through the reboiler circuits.
This case teaches a number of very important key lessons:
â¢ With a parallel reboiler system, maldistribution between parallel circuits does occur and can cause severe bottlenecks. To the best of our knowledge, this is the first time that such maldistribution is reported in the literature.
â¢ Pressure balances need to be considered at the design not only for the maximum design rates, but also at the minimum expected operation rates.
â¢ It is important to provide flexibility in once-through reboiler systems that will allow operating as a circulating thermosiphon systems, at least at low rates.
â¢ Finally, good troubleshooting can provide low cost (in this case, no cost) debottleneck of an entire gas plant.
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