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US 8,999,146 B2Granted
Process for feed preheating with flue gas cooler
AssigneeUop LLC
InventorsYunbo Liu, Xin X. Zhu, Daniel N. Myers, Patrick D. Walker
Life of this patent
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Abstract
Hydrocarbon feed to a catalytic reactor can be heat exchanged with flue gas from a catalyst regenerator. This innovation enables recovery of more energy from flue gas thus resulting in a lower flue gas discharge temperature. As a result, other hot hydrocarbon streams conventionally used to preheat hydrocarbon feed can now be used to generate more high pressure steam.
Claims20
A process comprising:
- combusting coke from coked catalyst to produce a regenerated catalyst and flue gas;
- directing said flue gas to a heat exchanger to generate steam and produce a partially cooled flue gas;
- heat exchanging the partially cooled flue gas with preheated liquid water to produce steam and cooled flue gas;
- heat exchanging the cooled flue gas with liquid water to produce further cooled flue gas;
- preheating a hydrocarbon feed with said further cooled flue gas
- wherein said further cooled flue gas comprises a temperature below 620° F.
3 more elements
A process for recovering heat from a flue gas from a catalyst regenerator comprising:
- heat exchanging steam with said flue gas to provide superheated steam and partially cooled flue gas;
- heat exchanging preheated liquid water with said partially cooled flue gas to produce said steam and cooled flue gas;
- heat exchanging liquid water with said cooled flue gas to provide said preheated liquid water and further cooled flue gas;
- and
- heat exchanging hydrocarbon feed with said further cooled flue gas having a temperature below 620° F. to provide preheated hydrocarbon feed and cool flue gas.
2 more elements
A process comprising:
- contacting a hydrocarbon feed with regenerated catalyst to produce cracked products and coked catalyst;
- combusting coke from the coked catalyst to produce regenerated catalyst and flue gas;
- directing said flue gas to a heat exchanger to generate steam and produce a partially cooled flue gas;
- heat exchanging the partially cooled flue gas with preheated liquid water to produce steam and cooled flue gas;
- heat exchanging said hydrocarbon feed and said cooled flue gas having a temperature below 620° F. to heat said hydrocarbon and cool said flue gas feed prior to contacting said hydrocarbon feed;
- interrupting feed flow to said heat exchanging step;
- and
- bypassing flue gas around said heat exchanging step in response to an interruption of hydrocarbon feed flow to said heat exchanging step.
5 more elements
Dependencies are inferred from the claim text.