Gas cooling with heat recovery
OwnerUtah Tsaoinventor
Life of this patent
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Abstract
Rapid cooling of a gas with simultaneous heat recovery is accomplished by directly contacting the gas with finely divided solids, and then recovering heat from the finely divided solids by passing the solids through at least two separate compartments where the solids are maintained as a fluidized bed, with heat being recovered therefrom by indirect heat transfer between a heat transfer fluid and the heated solids in the fluidized beds. Pyrolysis effluent may be rapidly quenched while providing for effective heat recovery.
Claims19
A process for cooling a gas and recovering heat therefrom, comprising:
- contacting a hot gas with finely divided solids to cool the gas and heat the solids;
- separating the gas and heated solids;
- passing heated solids through at least two zones;
- maintaining the solids as a fluidized bed in said at least two zones;
- and recovering heat from the heated solids in the at least two zones by heat exchange with a heat transfer fluid.
A process for quenching a pyrolysis effluent and recovering heat therefrom, comprising:
- quenching a pyrolysis effluent by direct contact with finely divided solids;
- separating heated finely divided solids from the pyrolysis effluent;
- passing the heated finely divided solids through at least two zones;
- maintaining said finely divided solids as a fluidized bed in said at least two zones;
- and recovering heat from the heated solids in the at least two zones by indirect heat transfer to generate steam.
In a process for thermal cracking a hydrocarbon to produce lower olefins wherein a pyrolysis effluent is produced, the improvement comprising:
- quenching said pyrolysis effluent by direct contact with finely divided solids;
- separating heated finely divided solids from said pyrolysis effluent;
- passing the heated finely divided solids through at least two zones;
- maintaining said finely divided solids as a fluidized bed in said at least two zones;
- and
- recovering heat from said heated solids in said at least two zones by indirect heat transfer to generate steam.
Dependencies are inferred from the claim text.