An apparatus and method for power generation during regasification, having a tank for a cryogenic fluid, a first pump connected to the tank via a first line, a first heat exchanger connected to the first pump via a second line, and a second heat exchanger connected downstream of the first heat exchanger, and a first turbine connected immediately downstream of the second heat exchanger, wherein a third line branches off from the first turbine and opens into the first heat exchanger, and a fourth line branches off from this first heat exchanger and opens into the second line, wherein a second pump is connected into the fourth line.

An apparatus and method for power generation during regasification, having a tank for a cryogenic fluid, a first pump connected to the tank via a first line, a first heat exchanger connected to the first pump via a second line, and a second heat exchanger connected downstream of the first heat exchanger, and a first turbine connected immediately downstream of the second heat exchanger, wherein a third line branches off from the first turbine and opens into the first heat exchanger, and a fourth line branches off from this first heat exchanger and opens into the second line, wherein a second pump is connected into the fourth line.

Systems and methods for coupling a chemical looping arrangement and a supercritical CO.sub.2 cycle are provided. The system includes a fuel reactor, an air reactor, a compressor, first and second heat exchangers, and a turbine. The fuel reactor is configured to heat fuel and oxygen carriers resulting in reformed or combusted fuel and reduced oxygen carriers. The air reactor is configured to re-oxidize the reduced oxygen carriers via an air stream. The air stream, fuel, and oxygen carriers are heated via a series of preheaters prior to their entry into the air and fuel reactors. The compressor is configured to increase the pressure of a CO.sub.2 stream to create a supercritical CO.sub.2 stream. The first and second heat exchangers are configured to heat the supercritical CO.sub.2 stream, and the turbine is configured to expand the heated supercritical CO.sub.2 stream to generate power.

A compressing device includes a first turbine a second turbine and a compressor. The first turbine is configured to provide a first energy by expanding a first medium and the second turbine configured to provide a second energy by expanding a second medium. The compressor is configured to receive the first energy and the second energy during a first mode of the compressing device, receive the first energy during a second mode of the compressing device, and compress the second medium in accordance with the first mode or the second mode.

A method of reducing rotor bow in a high pressure rotor of a gas turbine engine that has in axial flow a low pressure rotor and a high pressure rotor. The method involves storing bleed air from the gas turbine engine when the engine is running to provide stored pneumatic energy; and using that stored pneumatic energy after the engine has been shut-down to rotate the high pressure rotor at a speed and for a duration that reduces rotor bow. A gas turbine engine wherein rotor bow in the high pressure rotor after engine shut-down has been reduced by carrying out the aforesaid method is also disclosed.

A method of reducing rotor bow in a high pressure rotor of a gas turbine engine that has in axial flow a low pressure rotor and a high pressure rotor. The method involves storing bleed air from the gas turbine engine when the engine is running to provide stored pneumatic energy; and using that stored pneumatic energy after the engine has been shut-down to rotate the high pressure rotor at a speed and for a duration that reduces rotor bow. A gas turbine engine wherein rotor bow in the high pressure rotor after engine shut-down has been reduced by carrying out the aforesaid method is also disclosed.

A multi-stage turboexpander and a method for generating mechanical power therewith are disclosed. The multi-stage turboexpander includes a casing and a shaft, arranged for rotation in the casing. The shaft is supported by a first bearing at a first shaft end portion and a second bearing at a second shaft end portion. A first radial impeller and a second radial impeller are arranged between the first bearing and the second bearing on the shaft for co-rotation therewith around a rotation axis.

A multi-stage turboexpander and a method for generating mechanical power therewith are disclosed. The multi-stage turboexpander includes a casing and a shaft, arranged for rotation in the casing. The shaft is supported by a first bearing at a first shaft end portion and a second bearing at a second shaft end portion. A first radial impeller and a second radial impeller are arranged between the first bearing and the second bearing on the shaft for co-rotation therewith around a rotation axis.

This compressed air storage power generation device 10 is provided with: a power demand receiving unit 60 which receives in real-time the power demand value of consumer equipment 3; a power supply adjustment device 19 which adjusts the amount of power generated by a generator 15; and a control device which has a power generation amount control unit 17a for controlling the power supply adjustment device 19 so as to supply the consumer equipment 3 in a timely fashion with power corresponding to the power demand value received by the power demand receiving unit 60.

This compressed air storage power generation device 10 is provided with: a power demand receiving unit 60 which receives in real-time the power demand value of consumer equipment 3; a power supply adjustment device 19 which adjusts the amount of power generated by a generator 15; and a control device which has a power generation amount control unit 17a for controlling the power supply adjustment device 19 so as to supply the consumer equipment 3 in a timely fashion with power corresponding to the power demand value received by the power demand receiving unit 60.