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System and process for injecting catalyst and/or additives into a fluidized catalytic cracking unit

  • US 8,012,422 B2
  • Filed: 03/23/2005
  • Issued: 09/06/2011
  • Est. Priority Date: 03/23/2004
  • Status: Active Grant
First Claim
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1. A system for injecting catalyst and/or additives into a fluidized catalytic cracking unit, comprising:

  • a dust collector adapted to be in fluid communication with at least one storage bin holding one of the catalyst and/or additives;

    a vacuum producer in fluid communication with the dust collector so that the vacuum producer generates a vacuum within the dust collector that draws the one of the catalyst and/or additives into the dust collector; and

    a transfer pot in fluid communication with the dust collector for receiving the one of the catalyst and/or additives from the dust collector, the transfer pot adapted to be in fluid communication with the fluidized catalytic cracking unit and with a source of pressurized air so that the one of the catalyst and/or additives can be transferred to the fluidized catalytic cracking unit in response to a pressure differential between the transfer pot and the fluidized catalytic cracking unit;

    a plurality of load cells for measuring a weight of the dust collector, the transfer pot, and the one of the catalyst and/or additives drawn into the dust collector;

    where the vacuum producer is adapted to be in fluid communication with the source of pressurized air, the system further comprising;

    a first valve for isolating the vacuum producer from the source of pressurized air on a selective basis;

    a second valve for isolating the transfer pot from the source of pressurized air on a selective basis;

    a third valve for isolating the transfer pot from the fluidized catalytic cracking unit on a selective basis;

    a fourth valve for isolating the dust collector from the storage bin on a selective basis; and

    a controller electrically coupled to the load cells and respective actuators of the first, second, third, and fourth valves for controlling the operation of the first, second, third, and fourth valves.

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