Gas turbine system and method using temperature control of the exhaust gas entering the heat recovery cycle by mixing with ambient air

A gas turbine system with a heat recovery cycle comprising:

• a) a gas turbine unit for driving a utilization device and producing hot exhaust gases;
• b) a heat recovery heat exchanger containing a working fluid responsive to applied hot gases for producing vaporized working fluid and cooled gases which are vented;
• c) a vapor turbine connected to a generator and responsive to said vaporized working fluid for generating power and from which expanded working fluid exits;
• d) a condenser for condensing said expanded vaporized working fluid, and a pump for returning working fluid condensate to said heat recovery heat exchanger;
• and
• e) a combiner for combining ambient air with said hot exhaust gases and producing a mixture of hot exhaust gases and ambient air, said combiner being constructed and arranged to apply said mixture to said heat recovery heat exchanger;
• and
• f) a temperature sensor for sensing the temperature of said mixture and producing control signals, said combiner being responsive to said control signals for controlling the ratio of exhaust gases to ambient air in said mixture.

A gas turbine system with organic fluid heat recovery cycle comprising:

• a) a gas turbine unit for driving a utilization device and producing hot exhaust gases;
• b) a heat recovery heat exchanger containing an organic fluid responsive to applied hot gases for producing vaporized organic fluid and cooled gases that are vented
• c) an organic vapor turbine responsive to said vaporized organic fluid for driving a generator and generating power and from which expanded organic vapor exits;
• d) an air-cooled condenser for condensing said expanded vaporized organic fluid, and a pump for returning organic fluid condensate to said heat exchanger;
• e) an adjustable connection for selectively switching said hot exhaust gases between said heat recovery heat exchanger and a by-pass stack;
• and
• f) control means to mix ambient air with said hot gases to form a mixture for controlling the temperature of said mixture;
• and
• g) means for applying said mixture to said heat recovery heat exchanger.

A gas turbine system with a heat recovery cycle comprising:

• a) a gas turbine unit for driving a utilization device and producing hot exhaust gases;
• b) a heat recovery heat exchanger containing a working fluid responsive to applied hot gases for producing vaporized working fluid and cooled gases which are vented;
• c) a vapor turbine connected to a generator and responsive to said vaporized working fluid for generating power and from which expanded working fluid exits;
• d) a condenser for condensing said expanded vaporized working fluid to condensate, and a pump for returning working fluid condensate to said heat recovery heat exchanger;
• and
• e) control means for controlling the temperature of said applied hot gases, said control means including mixing means for mixing ambient air with said hot exhaust gases and producing a mixture of hot exhaust gases and ambient air before the mixture is applied to the heat recovery heat exchanger and enters into heat exchange relationship with said working fluid, said mixing means being responsive to the temperature of said mixture for controlling the ratio of exhaust gases to ambient air in said mixture.

A gas turbine system with a heat recovery cycle comprising:

• a) a gas turbine unit for driving a utilization device and producing hot exhaust gases;
• b) heat recovery heat exchanger means containing working fluid responsive to applied hot gases for producing vaporized working fluid and cooled gases that are vented;
• c) a vapor turbine responsive to said vaporized working fluid for driving a generator and generating power and from which expanded working fluid exits;
• d) an air-cooled condenser for condensing said expanded working fluid to condensate, and a pump for returning said condensate to said heat recovery heat exchanger;
• and
• e) control means for controlling the temperature of said applied hot gases before the latter are applied to said heat exchanger means, including mixing means for mixing ambient air with said hot exhaust gases before the gas mixture of hot exhaust gases and ambient air is applied to the heat recovery heat exchanger and enters into heat exchange relationship with said water.