The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO.sub.2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO.sub.2 circulating fluid. Fuel derived CO.sub.2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

In a system for producing power and capturing carbon dioxide (CO2) at an offshore site, separator units separate a fluid produced from an offshore vessel in fluid communication with a reservoir into water, oil, and gas. The gas is sent to oxy-firing gas turbine generator units. Air separation units separate an air into nitrogen and oxygen. The oxygen is sent to the oxy-firing gas turbine generator units. Gas compression units compress an exhaust gas from the oxy-firing gas turbine generator units. Dehydration units dehydrate the compressed exhaust gas, and a portion of the dehydrated compressed exhaust gas is recycled back to the oxy-firing gas turbine generator units. Gas pumps inject a remaining portion of the dehydrated compressed exhaust gas into the reservoir. Additionally, the oxy-firing gas turbine generator units generates electricity with the oxygen, the gas, and the portion of the dehydrated compressed exhaust gas.

The present invention relates to a process and an equipment of fossil fuel power generation with zero carbon emission, and provides the following complete technical solution of carbon capture and storage (CCS). Power generation of oxygen enriched combustion of fossil fuel such as coal is carried out in a power plant on a carbon dioxide storage site. The generated flue gas of carbon dioxide is pressurized and injected into the saline aquifer of the carbon storage site and/or an oil/gas field in situ. The generated power is transmitted externally. The present invention has the following technical advantages. The transportation step in existing CCS technology is eliminated, namely, the whole process of carbon loading and long-distance transportation and then unloading included in the transportation step is eliminated, which greatly reduces the difficulty and cost of implementing the complete CCS technical solution, and improves the feasibility of the CCS technical solution. It is helpful for the large-scale implementation of carbon capture and storage in the course of power generation using fossil fuels such as coal, namely, fossil fuel power generation with zero carbon emission. In this way, a new technical route is provided to break through CCS predicament, and large-scale comprehensive utilization of fossil energy resources such as a large number of coal/oil-gas and geological resources of a large number of saline aquifers can be realized finally.

A conical hub for a fan of a gas turbine engine is provided. The conical hub having: a plurality of attachment features located on an outer circumferential surface of the conical hub, wherein at least some of the plurality attachment features are axially aligned with each other and at least some of the plurality of attachment features are off set from each other, and wherein each of the plurality of attachment features have an opening configured to receive a portion of a pin; and the outer circumferential surface of the conical hub increases in diameter with respect to an axis of the conical hub in a forward to aft direction of the conical hub.

The present disclosure relates to systems and methods useful for power production utilizing direct combustion of a solid fuel, such as coal, biomass, or the like. The systems and methods can combine a first power producing cycle that is an open loop or semi-closed loop cycle with a second power producing cycle that is a closed loop cycle utilizing a recycled working fluid, preferably CO.sub.2. At least one stream from the open loop or semi-closed loop cycle can be used in a heating member to provide heat to the working fluid in the closed loop cycle. The solid fuel can be combusted at conditions facilitating easier removal of solids before a gaseous stream is treated and, optionally, at least partially recycled to the combustor as a recycle stream, preferably include CO.sub.2.

The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO.sub.2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO.sub.2 circulating fluid. Fuel derived CO.sub.2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

A system for offshore, direct carbon dioxide sequestration includes an offshore marine platform fixed to the ocean floor above an offshore, subsea storage reservoir. A carbon dioxide floating storage unit moored adjacent the marine platform gathers and stores carbon dioxide delivered in discreet amounts from carbon dioxide sources. Carbon dioxide sources may include carbon dioxide delivery vessels and a carbon dioxide capture system mounted on the marine platform. Once a desired volume of carbon dioxide has been gathered in the carbon dioxide floating storage unit, compressors in fluid communication with the carbon dioxide floating storage unit may be utilized to increase the pressure of the gathered carbon dioxide to a desired injection pressure, after which the pressurized carbon dioxide is pumped directly from the fixed marine platform into the subsea storage reservoir.

The present invention provides methods and system for power generation using a high efficiency combustor in combination with a CO.sub.2 circulating fluid. The methods and systems advantageously can make use of a low pressure ratio power turbine and an economizer heat exchanger in specific embodiments. Additional low grade heat from an external source can be used to provide part of an amount of heat needed for heating the recycle CO.sub.2 circulating fluid. Fuel derived CO.sub.2 can be captured and delivered at pipeline pressure. Other impurities can be captured.

A method for utilizing the inner energy of an aquifer fluid includes geothermal thermal water mixed with gas and optionally crude oil in a closed cycle to obtain an environmentally-neutral, carbon-dioxide-free utilization of the aquifer fluid and an environmentally-friendly supply of electric and thermal energy. An aquifer fluid is removed from an aquifer by means of a removal device, gas is separated by degassing the aquifer fluid in a gas-separation device, optionally crude oil is separated if necessary, the heat energy of the thermal water is utilized in at least one system for utilizing the thermal energy, the extracted gas and the optionally separated crude oil is com busted in at least one combustion device and the inner energy of the gas is utilized by operating a generator, the CO.sub.2 being removed from the waste gas and recycled into the aquifer.

A system for offshore, direct carbon dioxide sequestration includes an offshore marine platform fixed to the ocean floor above an offshore, subsea storage reservoir. A carbon dioxide floating storage unit moored adjacent the marine platform gathers and stores carbon dioxide delivered in discreet amounts from carbon dioxide sources. Carbon dioxide sources may include carbon dioxide delivery vessels and a carbon dioxide capture system mounted on the marine platform. Once a desired volume of carbon dioxide has been gathered in the carbon dioxide floating storage unit, compressors in fluid communication with the carbon dioxide floating storage unit may be utilized to increase the pressure of the gathered carbon dioxide to a desired injection pressure, after which the pressurized carbon dioxide is pumped directly from the fixed marine platform into the subsea storage reservoir.