October 2008

Maintenance and Reliability

Innovative approach solves CCR regenerator pinning problem

The root cause was regenerator gas blower oversizing

Saudi Aramco Yanbu' Refinery (YR) and Process and Control System Department engineers worked jointly to troubleshoot and resolve the successive plugging of the continuous catalyst regeneration (CCR) tower. The CCR section of the YR platformer experienced successive catalyst blowouts leading to a regeneration section shutdown. This caused the platformer section to operate at reduced feed rate and severity. It was concluded that the root cause for this problem was regeneration gas blower oversizing. The available option to reduce pinning was to lower the regeneration gas flow. Installing a restriction orifice on the regeneration gas blower suction eliminated the pinning problem and normal CC

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