Patent ID: 8046984

Claim:
A method for operating a gas-turbine engine, said method comprising the steps of: (a) providing a gas turbine that uses no air from outside atmosphere, (b) providing a gas-recycling means for recycling combustion gas from an outlet from said gas turbine to an inlet into said gas turbine, (c) providing a pressure-control means for controlling the pressure of recycled combustion gas and for discharging excess combustion gas into outside atmosphere, (d) providing a gas-cooling means for receiving, cooling and discharge of said combustion gas, (e) providing an oxygen-delivery means for adding oxygen to said combustion gas, (f) providing a fuel delivery means for adding fuel to said combustion gas, (g) providing a combustor, (h) providing a control means for controlling the operation of said gas-turbine engine in response to operator's demands and in accordance with a control program incorporated in said control means, (i) operating said gas-turbine engine in a gas-recycling mode by continuously performing a process that includes the steps of: (1) receiving hot combustion gas from said outlet from said gas turbine into said gas-cooling means, (2) cooling said hot combustion gas in said gas-cooling means, whereby said hot combustion gas turns into a cooled combustion gas, (3) adding oxygen to said cooled combustion gas and transferring said cooled combustion gas into said combustor, (4) adding fuel to said cooled combustion gas, whereby a combustible mixture forms, (5) burning said combustible mixture and producing very hot combustion gas in said combustor, wherein the temperature of said very hot combustion gas is higher than the temperature of said hot combustion gas, (6) transferring said very hot combustion gas from said combustor to said inlet into said gas turbine and using energy of said very hot combustion gas to operate said gas turbine, whereby said very hot combustion gas turns into hot combustion gas, (7) expelling said hot combustion gas from said gas turbine through said outlet from said gas turbine, and (8) discharging excess hot combustion gas into outside atmosphere, and (j) using said control means for control of operation of said gas-turbine engine, whereby said gas-turbine engine operates without receiving air from outside atmosphere, whereby said combustible mixture contains no nitrogen. whereby no nitrogen oxides are produced in said gas-turbine engine, and whereby harmful exhaust emissions are recycled back into said combustor and burned there.