Patent ID: 8230796
Filing Date: 2012-07-31
Classification: F22B,F23C,F23J,F23L,Y02E

Abstract:
1. An O2 firing steam generating system comprising: a fossil fuel combustor configured so as to be operative to (i) effect the fluidization of fossil fuel to thereby create a fluidized bed therefrom, (ii) to combust such fossil fuel for purposes of heating a first working fluid therewith and for generating a flue gas and hot solids entrained in the flue gas from such combustion of such fossil fuel, and (iii) to thereafter effect the exhausting of both such heated first working fluid and such generated flue gas; an air preheater configured so as to be operative to receive such generated flue gas from said fossil fuel combustor; a blower configured so as to be operative to cause both O2 and recycled flue gas to flow to said air preheater; a turbine configured so as to be operative to be driven by such exhausted heated first working fluid; wherein said air preheater (i) is operative to effect the transfer of heat from such received flue gas to both such O2 and recycled flue gas in order to thereby effect a preheating therewith of both such O2 and such recycled flue gas and a cooling of such received flue gas; and wherein said fossil fuel combustor is operative to effect the fluidization of such fossil fuel with both such preheated O2 and such recycled flue gas; a separator configured so as to be operative to effect therewith the separation of such entrained hot solids from such exhausted hot flue gas, wherein such exhausted flue gas that is received by said air preheater is such exhausted flue gas that has been subjected to separation in said separator; and a heat exchanger configured so as to be operative to (i) receive both such separated hot solids and a second working fluid, (ii) effect the transfer of heat from such received hot solids to such received second working fluid in order to thereby effect both a cooling of such received hot solids and the heating of such second working fluid, and (iii) the exhaustion of such heated second working fluid; and wherein said turbine is further configured so as to be operative to be driven by such exhausted heated second working fluid; a second blower configured so as to be operative to cause recycled flue gas to flow to said heat exchanger; and wherein such recycled flue gas is caused to flow to said heat exchanger both for purposes of effecting therewith a fluidization of and for purposes of causing such cooled solids to flow from said heat exchanger to said fossil fuel combustor; a second heat exchanger configured so as to be operative to (i) receive other separated hot solids and a third working fluid, and (ii) effect the transfer of heat from such received other hot solids to such received third working fluid in order to thereby effect a cooling therewith of such received other hot solids and a heating of such third working fluid; wherein said second blower is further configured so as to be operative to cause such recycled flue gas to flow to said second heat exchanger; and wherein such recycled flue gas is caused to flow to said second heat exchanger both for purposes of effecting therewith the fluidization of and for purposes of causing such other cooled solids to flow from said second heat exchanger to said fossil fuel combustor.