FCCU Plug Valves
Several FCC Process Licensors utilize plug valves to control the catalyst flow in their units in lieu of slide valves. Used as an alternate to the Slide Valve, the unique valve controls the catalyst as it moves from the regenerator to the base of the riser while oil is introduced into the riser via the stem of the plug valve and subsequently, the catalyst flow is regulated.
Hollow Cone Plug Valve
Solid Cone Plug Valve
FCC Plug Valves (Spent and Regen) are mounted vertically and have a conical plug covered with a high resistant refractory at the top of the plug. The conical plug is fitted to a seat ring attached to the standpipe. The valve is located within the Reactor / Regenerator and when the plug is raised to the closed position, it seats against the mating seat ring and closes off the flow of catalyst in the Standpipe / Riser Section.
Industry Challenge to Solve
When the main air blower stops during an unwanted outage, the hollow tube will fill up with hot catalyst and damage the internal packing.
Our Solutions
- An internal stuffing box was designed to provide a seal at the lower guide liner. A seal below the lower guide liner would allow the purge to flow towards the lower regenerator and keep the catalyst out of the plug valve and stop the by-pass of catalyst.
- An internal check valve inside the plug was designed to stop the catalyst at the top of the plug valve, in case of a main air blower failure. This check valve closes on loss of air flow and keeps the catalyst from over-heating the internal stuffing box.
US Patent 2012/0073679
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