Power generation system

A power generation system comprising:

• primary combustor means for high temperature combustion of coal fuel under a reducing condition and producing product gas;
• means for supplying coal fuel to said primary combustor means;
• compressor means having an outlet for supplying a fluid selected from the group consisting of air and oxygen to produce a reducing condition in said primary combustor means;
• secondary combustor means for producing complete combustion of said product gas from said primary combustor means;
• first duct means for conducting said product gas from said primary combustor means to said secondary combustor means;
• second duct means connected between said compressor means outlet and said primary and secondary combustor means for conducting said fluid from said outlet of said compressor means to said primary combustor means and said secondary combustor means;
• heat exchanger means in said first and second duct means so that said product gas from said primary combustor means heats said fluid in said second duct means passing from said outlet of said compressor means to said primary and secondary combustor means;
• gas turbine means operatively connected to said compressor means for driving said compressor means;
• third duct means connected between an outlet of said secondary combustor means and an inlet of said gas turbine means for conducting combustion gas from said secondary combustor means to said gas turbine means;
• waste heat steam generator means having an inlet connected to an outlet of said gas turbine means and an outlet;
• desulfurization means having an inlet connected to said outlet of said waste heat steam generator means and an outlet;
• condenser means having an inlet connected to said outlet of said desulfurization means for receiving said combustion gas from said desulfurization means and for separating carbon dioxide and condensed water therein;
• and
• further duct means for conducting an additive fluid from said condenser means to said secondary combustor means for controlling the temperature of said combustion gas from said secondary combustor means, said additive fluid from said condenser means being selected from the group consisting of carbon dioxide and water.