Efficiency of gasification processes
AssigneeKellogg Brown & Root LLC
InventorRAVINDRA K. AGRAWAL
Life of this patent
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Abstract
Systems and processes for producing syngas and power therefrom are provided. One or more feedstocks and one or more oxidants can be combined in a fluidized reaction zone operated at a temperature from 550° C. to 1,050° C. to provide a syngas. Heat can be indirectly exchanged in a first zone from the syngas to a condensate to provide steam. Heat can also be indirectly exchanged in a second zone from the syngas to the steam to provide superheated steam. Heat can then be indirectly exchanged in a third zone from the syngas to provide a cooled syngas and the condensate for the first zone. At least a portion of the superheated steam can be directly supplied to one or more steam turbines to produce power.
Claims20
1) A process for producing syngas and power therefrom, comprising:
- combining one or more feedstocks and one or more oxidants in a fluidized reaction zone operated at a temperature of from 550° C. to 1,050° C. to provide a syngas;
- indirectly exchanging heat in a first zone from the syngas to a condensate to provide steam and a cooled syngas having a first temperature;
- indirectly exchanging heat in a second zone from the syngas cooled in the first zone to at least a portion of the steam produced in the first zone to provide superheated steam and a cooled syngas having a second temperature;
- indirectly exchanging heat in a third zone from the syngas cooled in the second zone to a heat transfer medium consisting essentially of water to provide the condensate and a cooled syngas having a third temperature;
- supplying at least a portion of the superheated steam produced in the second zone to one or more steam turbines to produce power;
- and
- supplying at least a portion of the condensate provided in the third zone to the first zone for indirect heat exchange with the syngas therein.
12) A process for producing syngas and power therefrom, comprising:
- combining a feedstock comprising polymer, biomass, and coal with one or more oxidants in a reaction zone heated from 550° C. to 1,050° C. to produce, wherein the polymer is selected from the group consisting of polypropylene, polyethylene, polystyrene, polyethylene terephthalate, poly blends, other polyolefins, and poly-hydrocarbons limited to oxygen as an additional constituent;
- indirectly exchanging heat in a first zone from the syngas to a condensate to provide steam and a cooled syngas having a first temperature;
- indirectly exchanging heat in a second zone from the syngas cooled in the first zone to at least a portion of the steam produced in the first zone to provide superheated steam and a cooled syngas having a second temperature;
- indirectly exchanging heat in a third zone from the syngas cooled in the second zone to a heat transfer medium consisting essentially of water to provide the condensate and a cooled syngas having a third temperature;
- supplying at least a portion of the superheated steam produced in the second zone to one or more steam turbines to produce power;
- and
- supplying at least a portion of the condensate provided in the third zone to the first zone for indirect heat exchange with the syngas therein.
20) A system for producing syngas and power therefrom comprising:
- one or more gasifiers operated at conditions sufficient to convert a carbonaceous feedstock in the presence of an oxidant to provide syngas;
- a first heat exchanger adapted to exchange heat from at least a portion of the syngas to a condensate to provide steam and a cooled syngas having a first temperature;
- a second heat exchanger adapted to exchange heat from at least a portion of the syngas cooled in the first heat exchanger to at least a portion of the steam produced in the first heat exchanger to provide superheated steam and a cooled syngas having a second temperature;
- a third heat exchanger adapted to exchange heat from at least a portion of the syngas cooled in the second heat exchanger to a heat transfer medium consisting essentially of water to provide the condensate and a cooled syngas having a third temperature;
- and
- one or more steam turbines adapted to produce power from at least a portion of the superheated steam produced in the second heat exchanger.
Dependencies are inferred from the claim text.