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Method of and System For Generating Power By Oxyfuel Combustion

  • US 20090297993A1
  • Filed: 05/30/2008
  • Published: 12/03/2009
  • Est. Priority Date: 05/30/2008
  • Status: Abandoned Application
First Claim
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1. A method of generating power by oxyfuel combustion, the method comprising the steps of:

  • (a) feeding carbonaceous fuel into a furnace;

    (b) feeding oxidant gas into the furnace, wherein, in a first operating mode, the oxidant gas comprises a stream of substantially pure oxygen conveyed from an oxygen supply for combusting the fuel with the oxygen to produce exhaust gas comprising mainly carbon dioxide and water;

    (c) discharging an exhaust gas stream from the furnace;

    (d) dividing the exhaust gas stream in a final divider piece into a recycling portion and an end portion;

    (e) recycling the recycling portion through a gas recycling channel to the furnace; and

    (f) conveying the end portion through an outlet channel to final processing, wherein the method also comprises the steps of;

    (g) dividing the exhaust gas stream in a first divider piece, arranged upstream of the final divider piece, into a first exhaust gas stream and a second exhaust gas stream;

    (h) transferring heat from the first exhaust gas stream to gas in the gas recycling channel by a gas-gas heat exchanger to form a cooled first exhaust gas stream;

    (i) transferring heat from the second exhaust gas stream to a flow of feedwater in a feedwater line by a first economizer to form a cooled second exhaust gas stream;

    (j) combining the cooled first exhaust gas stream and the cooled second exhaust gas stream in a connecting piece arranged upstream of the final divider piece to form a combined exhaust gas stream; and

    (k) conveying at least a portion of the combined exhaust gas stream through a second economizer arranged to transfer heat from the combined exhaust gas stream to the flow of feedwater in the feedwater line.

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