Systems and methods for improving the efficiency of plants that use a gas turbine engine to power a process air compressor are disclosed. Examples of such plants include ammonia production plants, wherein a gas turbine engine is used to power a process air compressor and wherein exhaust gas from the gas turbine engine is provided as combustion gas to a reformer furnace. The increase in efficiency is provided using a booster compressor to enhance the performance of the gas turbine engine. According to some embodiments, the booster compressor may also be used to reduce the power consumption of the process air compressor. According to some embodiments, a side stream from the booster compressor may be provided to the furnace to supplement the combustion gas provided by the gas turbine engine exhaust gas. The disclosed methods and systems increase the efficiency of the plant while maintaining the duty balance between the furnace and the process air compressor-driven process.

Systems and methods for improving the efficiency of plants that use a gas turbine engine to power a process air compressor are disclosed. Examples of such plants include ammonia production plants, wherein a gas turbine engine is used to power a process air compressor and wherein exhaust gas from the gas turbine engine is provided as combustion gas to a reformer furnace. The increase in efficiency is provided using a booster compressor to enhance the performance of the gas turbine engine. According to some embodiments, the booster compressor may also be used to reduce the power consumption of the process air compressor. According to some embodiments, a side stream from the booster compressor may be provided to the furnace to supplement the combustion gas provided by the gas turbine engine exhaust gas. The disclosed methods and systems increase the efficiency of the plant while maintaining the duty balance between the furnace and the process air compressor-driven process.

Disclosed are an air supply device and an air supply method for a hybrid power generation facility in which a gas turbine compresses air introduced from an outside, mixes the compressed air with fuel, and burns a mixture of the compressed air and the fuel to produce combustion gas. The air supply device includes a mixing chamber configured to selectively receive the combustion gas from the gas turbine, an air preheater configured to supply air to the mixing chamber, a burner configured to burn a fluid supplied from the mixing chamber, a first over-firing air supplier configured to receive a fluid from the gas turbine or the air preheater, a first pipeline connecting the gas turbine and the mixing chamber, and a second pipeline connecting the gas turbine and the first over-firing air supplier.

Disclosed are an air supply device and an air supply method for a hybrid power generation facility in which a gas turbine compresses air introduced from an outside, mixes the compressed air with fuel, and burns a mixture of the compressed air and the fuel to produce combustion gas. The air supply device includes a mixing chamber configured to selectively receive the combustion gas from the gas turbine, an air preheater configured to supply air to the mixing chamber, a burner configured to burn a fluid supplied from the mixing chamber, a first over-firing air supplier configured to receive a fluid from the gas turbine or the air preheater, a first pipeline connecting the gas turbine and the mixing chamber, and a second pipeline connecting the gas turbine and the first over-firing air supplier.

A method of raising the pressure of a natural gas stream (9) on an oil or gas producing installation (1) comprises using an existing high pressure gas stream (13) at the installation to drive the turbine (12) of a turbo-compressor unit (10). It is common on oil and gas producing installations to require the pressure of a gas stream to be increased by a small amount, e.g. to allow flare gas to be fed to the production gas train thereby avoiding flaring. This system may replace the current practice of using ejectors for this purpose since ejectors are very inefficient. However, it can be advantageous to feed the output of the turbine side (12) of the turbo-compressor (10) to an ejector which can give a small pre-boost to the low pressure natural gas (9) before it enters the compressor side (11) of the turbo-compressor (10). (FIG. 2)

A method of raising the pressure of a natural gas stream (9) on an oil or gas producing installation (1) comprises using an existing high pressure gas stream (13) at the installation to drive the turbine (12) of a turbo-compressor unit (10). It is common on oil and gas producing installations to require the pressure of a gas stream to be increased by a small amount, e.g. to allow flare gas to be fed to the production gas train thereby avoiding flaring. This system may replace the current practice of using ejectors for this purpose since ejectors are very inefficient. However, it can be advantageous to feed the output of the turbine side (12) of the turbo-compressor (10) to an ejector which can give a small pre-boost to the low pressure natural gas (9) before it enters the compressor side (11) of the turbo-compressor (10). (FIG. 2)

A method for managing the offtake of power produced by an auxiliary power unit of an aircraft. The method comprises a step of calculating a maximum capacity for offtake of mechanical power that the auxiliary power unit can provide to the aircraft, a step of determining an actual offtake of mechanical power taken off by a first mechanical power offtake system of the auxiliary power unit, a step of comparing the maximum capacity for offtake of mechanical power and the actual offtake of mechanical power, a step of optimizing the offtake of mechanical power which step, based on the comparison of the maximum capacity for offtake of mechanical power and the actual offtake of mechanical power, determines at least one corrective action. A device for managing the offtake of power produced by an auxiliary power unit of an aircraft and an aircraft including such a device are provided.

Methods for producing syngas (e.g., H.sub.2 and CO) include introducing a stream comprising H.sub.2O and CO.sub.2 to a high-temperature co-electrolysis (HTCE) unit. A CO.sub.2 sweep gas is also introduced to the HTCE unit. Both H.sub.2O and CO.sub.2 are reduced in the HTCE unit to form the syngas and to form O.sub.2 that is swept away from the HTCE unit by the CO.sub.2 sweep gas, and the O.sub.2 and CO.sub.2 are then introduced to a combustion device (e.g., a gasifier), which may be configured to generate electrical power, as a result of combusting a carbonaceous fuel in the presence of the O.sub.2 and CO.sub.2. The HTCE unit is powered at least in part by power from an electricity-generating sub-system (e.g., at least one nuclear power plant). Related systems are also disclosed.

Methods for producing syngas (e.g., H.sub.2 and CO) include introducing a stream comprising H.sub.2O and CO.sub.2 to a high-temperature co-electrolysis (HTCE) unit. A CO.sub.2 sweep gas is also introduced to the HTCE unit. Both H.sub.2O and CO.sub.2 are reduced in the HTCE unit to form the syngas and to form O.sub.2 that is swept away from the HTCE unit by the CO.sub.2 sweep gas, and the O.sub.2 and CO.sub.2 are then introduced to a combustion device (e.g., a gasifier), which may be configured to generate electrical power, as a result of combusting a carbonaceous fuel in the presence of the O.sub.2 and CO.sub.2. The HTCE unit is powered at least in part by power from an electricity-generating sub-system (e.g., at least one nuclear power plant). Related systems are also disclosed.

Systems and methods to pump fracturing fluid into a wellhead may include a gas turbine engine including a compressor turbine shaft connected to a compressor, and a power turbine output shaft connected to a power turbine. The compressor turbine shaft and the power turbine output shaft may be rotatable at different rotational speeds. The systems may also include a transmission including a transmission input shaft connected to the power turbine output shaft and a transmission output shaft connected to a hydraulic fracturing pump. The systems may also include a fracturing unit controller configured to control one or more of the rotational speeds of the compressor turbine shaft, the power turbine output shaft, or the transmission output shaft based at least in part on target signals and fluid flow signals indicative of one or more of pressure or flow rate associated with fracturing fluid pumped into the wellhead.