US 2009/0211500 A1 · AIR-FIRED CO2 CAPTURE READY CIRCULATING FLUIDIZED BED HEAT GENERATION WITH A REACTOR SUBSYSTEM

Abstract

A combustor 110 combust a fluidized bed of fossil fuel 114, 114′ to heat a working fluid 102 and generate flue gas 104. An air preheater 144 has first and second gas passageways 144a, 144b for respectively directing the generated flue gas 150 and another gas 250 with captured CO2 generated by combustion outside of the combustor 110. When operated in a non-CO2 capture, the air preheater 144 receives the flue gas 150, but not the other gas 250, and the first gas passageway 144a directs the flue gas 150 so as to preheat the air 188. However, when operated in the CO2 capture mode, the air preheater 144 receives the flue gas 150 and the other gas 250, and the second gas passageway 144b also directs the other gas 250 so as to preheat the air 188′. In either mode, the preheated air 188, 188′ is applied by the combustor 110 to fluidize a bed of fossil fuel 114, 114′.

Claims21

Dependent claims

A heat generating system operable in a non-CO2 capture mode or a CO2 capture mode, comprising:

a combustor configured to (i) combust a fluidized bed of fossil fuel to heat a working fluid and generate flue gas, and (ii) exhaust the heated working fluid and the generated flue gas;
and
a preheater configured to preheat air, and having a first gas passageway for directing the exhausted flue gas to preheat the air and a second gas passageway for directing other gas with captured CO2 generated by combustion outside of the combustor;
wherein the combustor is further configured to fluidize a bed of fossil fuel with the preheated air;
wherein, in the non-CO2 capture mode, (i) the preheater receives the exhausted flue gas, but not the other gas, and (ii) the first passageway directs the received flue gas to preheat the air, thereby cooling the directed flue gas.

2 more elements

A method of operating a heat generating system, having a preheater for preheating air that includes a first gas passageway and a second gas passageway, comprising:

combusting a fluidized bed of fossil fuel to heat a working fluid and generate first gas;
in the non-CO2 capture mode, only directing the generated first gas via the first gas passageway to preheat the air, thereby cooling the generated first gas;
directing the cooled first gas along a first path;
and
fluidizing a bed of fossil fuel with the preheated air.

2 more elements

A heat generating system for capturing CO2, comprising:

a combustor configured to combust a fluidized bed of fossil fuel to heat a working fluid and to generate first gas and residual first solids;
a reactor configured to combust the generated first solids to thereby generate second gas and residual second solids;
and
a preheater having a first gas passageway configured to direct the generated first gas and a second gas passageway configured to direct the generated second gas so as to preheat air, thereby cooling the directed first gas and the directed second gas;
wherein the combustor is further configured to apply the preheated air to fluidize a bed of fossil fuel.

2 more elements

Dependencies are inferred from the claim text.

Air-fired co2 capture ready circulating fluidized bed heat generation with a reactor subsystem

Life of this patent

Air-fired co2 capture ready circulating fluidized bed heat generation with a reactor subsystem

Life of this patent

Abstract

Claims21