| 摘要 |
A method of heating or cooling particulate material by indirect heat exchange of the particles with a heat exchange fluid in a heat exchanger is improved by the use of a gas vent that operates to pump catalyst into and out of a heat exchanger. A periodic build-up of fluidizing medium in a particle cycling zone intermittently causes catalyst to flow into out of a heat exchanger. The method and apparatus of this invention are particularly useful for the cooling of FCC catalyst and simplifies the addition of a cooler by allowing the use of small size catalyst transfer lines.
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