| 摘要 |
The duty of a side-mounted, backmix type catalyst cooling zone is increased by having one conduit that delivers catalyst to the top of the cooling zone and another conduit that uses fluidizing gas to vent catalyst from the top of the cooling zone back to a regenerator. The catalyst cooling zone is used to cool catalyst in a fluidized catalytic cracking process. The cooling zone comprises a heat exchanger located remote from an FCC regenerator that supplies hot catalyst particles to the cooling zone from a dense phase catalyst bed. Hot catalyst particles enter the top end of the cooling zone through a first conduit. Fluidizing gas, added to the cooling zone for backmixing and heat transfer purposes, exits the top of the cooling zone through a second conduit that communicates the top of the cooler with a dilute phase catalyst zone in the regenerator. Gas flow into and through the second conduit transports catalyst from the cooling zone to the regenerator. In order to minimize any flow of fluidizing gas up the first conduit, a gas collection zone can be maintained in the upper end of the cooling zone.
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