Gas turbine system

1. A gas turbine system comprising:

an ammonia source and an oxygen-containing gas source;

a first combustion chamber connected to receive a first ammonia gas stream, a first hydrogen-comprising gas stream, and an oxygen-containing gas stream;

a first turbine connected to receive a first exhaust gas stream from the first combustion chamber;

a second combustion chamber connected to receive a second exhaust gas stream from the first turbine, a second ammonia gas stream, and a second hydrogen-comprising gas stream;

said ammonia source connected to the first combustion chamber to provide the first ammonia gas stream to the first combustion chamber;

said ammonia source also connected to the second combustion chamber to provide the second ammonia gas stream to the second combustion chamber; and

a first cracker chamber arranged to receive a third ammonia gas stream from the ammonia source and to supply the first hydrogen-comprising gas stream to the first combustion chamber.

2. A gas turbine system as claimed in claim 1 further comprising a second cracker chamber arranged to receive a fourth ammonia gas stream from the ammonia source and to supply the second hydrogen-comprising gas stream to the second combustion chamber.

3. A gas turbine system as claimed in claim 2 wherein a temperature of at least one of said first cracker chamber and said second cracker chamber is regulated by mass control of a flow of a third exhaust gas stream from the second combustion chamber.

4. A gas turbine system as claimed in claim 1 further comprising a heat exchanger arranged to receive a third exhaust gas stream from the second combustion chamber.

5. A gas turbine system as claimed in claim 4 comprising a second turbine, which is a steam turbine operated by heat derived from said heat exchanger.

6. A method for extracting energy from ammonia, comprising:

providing an oxygen-containing gas stream to a first combustion chamber;

providing a first ammonia gas stream to the first combustion chamber;

providing a first hydrogen-comprising gas stream to the first combustion chamber;

performing a first combustion in the first combustion chamber that produces a first exhaust gas stream;

providing said first exhaust gas stream from said first combustion chamber to a second combustion chamber;

supplying a second ammonia gas stream to the second combustion chamber;

supplying a second hydrogen-comprising gas stream to the second combustion chamber;

performing a second combustion in the second combustion chamber with an enhanced equivalence ratio;

generating the first hydrogen-comprising gas stream, which is supplied through the first combustion chamber, by cracking a third ammonia stream; and

connecting a turbine to receive the first exhaust gas stream from the first combustion chamber and providing a second exhaust gas stream from the turbine to the second combustion chamber, thereby causing the turbine to generate a mechanical output.

7. A method for extracting energy from ammonia as claimed in claim 6 wherein said equivalence ratio is in a range between 1.0 and 1.2.

8. A method as claimed in claim 6 comprising generating the second hydrogen-comprising gas stream to the second combustion chamber by cracking a fourth ammonia stream.

9. A method as claimed in claim 8 comprising conducting said cracking the third ammonia stream or the fourth ammonia stream at an elevated temperature provided by a third exhaust gas stream from the second combustion chamber.

10. A method as claimed in claim 6 comprising removing waste heat from a third exhaust gas stream from the second combustion chamber, and recovering energy from said waste heat.