Patent EA-001062-B1 (EA)
Title: Method for converting energy of pressurized gas into useful energy and gas turbine (steam gas) installation therefor
Inventor: AKHMEDOV RUSTAM B AKHMEDOV ENV
IPC: F02C3/34
Filed: 1998-06-08
Abstract: 1. A method for converting energy of pressurized gas into useful energy to be used in a gas turbine (steam gas) installation in which fuel and pressurized gaseous oxidant are injected into a combustion chamber, the mixture is burnt in said combustion chamber with simultaneous injection into it secondary gases for cooling the burning products, the last are directed to the blades of a gas turbine, the mechanical energy of the shaft rotation is converted into the useful energy, characterized in that a mixture of oxygen with carbon dioxide are injected into the combustion chamber as the gaseous oxidant, the concentration of oxygen equal essentially to 21%, the fuel is burnt maintaining the coefficient of the oxygen excess in the burning zone within 1,05-1,15 %, while oxygen is obtained by separating air into oxygen and nitrogen, and carbon dioxide is removed from the waste turbine gases after they are cooled. 2. The method as claimed in claim 1, characterized in that said waste turbine gases are cooled to the temperature below the dew point, while the fresh water separated as a condensate is collected in a storage tank. 3. The method as claimed in claim 2, characterized in that said waste cooled gases are injected into the combustion chamber as secondary gases. 4. The method as claimed in claims 1 to 3, characterized in that the excessive carbon dioxide is fed into a gasholder. 5. A gas turbine (steam gas) installation comprising a combustion chamber (9) having an inlet (10) for fuel injection, an inlet (7) for oxidant injection and an outlet of the burnt products, a compressor (6) connected on the side of high pressure to the inlet (7) of oxidant injection, a gas turbine (11) arranged behind the combustion chamber (9) along the flow of the burning products and mounted on one shaft (12) with the compressor (6) and a means for cooling the waste turbine gases, characterized in that it is provided with an air-separating device (1) having outlets (4, 3) for oxygen and nitrogen, and with a mixing chamber (5), connected by its one end to the inlet to the outlet (4) for oxygen of the air-separating device, by its second inlet to the outlet of the cooling means, by its outlet to the compressor on the side of low pressure. 6. The gas turbine (steam gas) installation as claimed in claim 5, characterized in that the cooling means of the waste gases is designed in the form of successively arranged along the gas flow a steam generator (14), or exhaust-heat boiler and contact economizer (15) with cooling to the temperature below the dew point provided with a line of taking-off the fresh water and an outlet (18) of the cooled burning products. 7. The gas turbine (steam gas) installation as claimed in claim 6, characterized in that to the outlet (18) of the cooled burning products of the economizer (15) a drying chamber (27), an additional compressor (28) and a gasholder (29) for collecting carbon dioxide are connected successively along the gas flow. 8. The gas turbine (steam gas) installation as claimed in claim 6 or 7, characterized in that a recycling exhaust fan (23) is mounted in line (22) of connection the cooling means with the mixing chamber behind the economizer (15). 9. The gas turbine (steam gas) installation as claimed in claim 5, characterized in that the outlet (18) of the economizer (15) is connected to second additional compressor (25) arranged on the shaft (12) of the turbine (11) on the side of low pressure, while on the side of high pressure said compressor is connected to the inlet (26) of injection of waste gases of the combustion chamber (9). 10. The gas turbine (steam gas) installation as claimed in claim 5, characterized in that the outlet (32) of the gasholder (29) is connected via a valve (34) and a throttle (35) to the line of connecting the economizer (15) with the additional compressor (25). 11. The gas turbine (steam gas) installation as claimed in any of claims 6-10, characterized in that the outlet (36) of the gasholder (29) is connected via a valve (38) with the inlet of the exhaust fan.