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 power plant comprises a combustor for combusting first and second constituents to generate a gas stream, a turbine for rotation by the gas stream, a compressor to receive a first portion of the gas stream and provide compressed gas to the combustor, a recompressor configured to receive a second portion of the gas stream and provide compressed gas to the combustor, a generator to be driven by the turbine, and a methane reforming reactor configured to dry reform methane to provide the first constituent. A method of operating a power plant comprises operating a supercritical CO2 power cycle to turn a turbine, driving a generator with the turbine, extracting CO2 byproduct from the power cycle, reacting fuel and CO2 to produce a synthesis gas in a dry reforming of methane reactor, and mixing the synthesis gas with oxygen to execute a combustion process for the power cycle.

A gas turbine plant includes an exhaust line, a carbon dioxide recovery device configured to recover carbon dioxide contained in an exhaust gas, a circulation line connected to a gas turbine, a first valve device, a bypass line bypassing the carbon dioxide recovery device, a second valve device provided on the bypass line, a third valve device provided at a position between the bypass line and the carbon dioxide recovery device, a densitometer configured to detect a carbon dioxide concentration in the exhaust gas, and a control device configured to adjust opening degrees of the first valve device, the second valve device, and the third valve device based on an operation state of the gas turbine and the carbon dioxide concentration.

A bottoming cycle power system includes a turbo-expander operable to rotate a turbo-crankshaft as a flow of exhaust gas from a combustion process passes through the turbo-expander. A turbo-compressor is operable to compress the flow of exhaust gas after the exhaust gas passes through the turbo-expander. An open cycle absorption chiller system includes an absorber section operable to receive the flow of exhaust gas from the turbo-expander and to mix the flow of exhaust gas with a first refrigerant solution within the absorber section. The first refrigerant solution is operable to absorb water from the exhaust gas as the exhaust gas passes through the first refrigerant solution. The absorber section is operable to route the flow of exhaust gas to the turbo-compressor after the flow of exhaust gas has passed through the first refrigerant solution.

Control systems and methods suitable for combination with power production systems and methods are provided herein. The control systems and methods may be used with, for example, closed power cycles as well as semi-closed power cycles. The combined control systems and methods and power production systems and methods can provide dynamic control of the power production systems and methods that can be carried out automatically based upon inputs received by controllers and outputs from the controllers to one or more components of the power production systems.

The invention relates to a method for operating a power plant (1) for generating electrical energy for delivery to at least one consumer (16) by combustion of a carbonaceous combustible, wherein carbon dioxide (19) is separated from the flue gas (7) of the power plant (1), the separated carbon dioxide (19) is converted at least in part into a fuel (20), characterized in that the fuel (20) is combusted at least temporarily in at least one heat engine (4) so as to form a waste gas (8), and electrical energy is generated by the heat engine (4) and is delivered to at least one consumer (16), at least some of the thermal energy of the waste gas (8) being used in at least one of the following processes: a) for heating combustion air (10) of a power plant (1); b) for heating a process medium (14) of the power plant (1); c) in a drying of the combustible of the power plant (1); and d) in carbon dioxide separation.

The present disclosure relates to systems and methods useful for power production. In particular, a power production cycle utilizing CO.sub.2 as a working fluid may be combined with a second cycle wherein a compressed CO.sub.2 stream from the power production cycle can be heated and expanded to produce additional power and to provide additional heating to the power production cycle.

A combustor of an embodiment includes: a combustor casing; a combustor liner which is provided in the combustor casing and combusts a fuel and an oxidant to produce a combustion gas; a pipe-shaped member provided to penetrate the combustor casing and the combustor liner; a heat-resistant glass which is provided on the combustor casing side in the pipe-shaped member and closes the pipe-shaped member; a laser light supply mechanism which irradiates an interior of the combustor liner through the heat-resistant glass and an interior of the pipe-shaped member with a laser light; and a contact prevention mechanism which prevents a combustion gas in the combustor liner from coming into contact with the heat-resistant glass.

A gas turbine plant includes an exhaust line, a carbon dioxide recovery device configured to recover carbon dioxide contained in an exhaust gas, a circulation line connected to a gas turbine, a first valve device, a bypass line bypassing the carbon dioxide recovery device, a second valve device provided on the bypass line, a third valve device provided at a position between the bypass line and the carbon dioxide recovery device, a densitometer configured to detect a carbon dioxide concentration in the exhaust gas, and a control device configured to adjust opening degrees of the first valve device, the second valve device, and the third valve device based on an operation state of the gas turbine and the carbon dioxide concentration.

A powered system is disclosed including a power block, an exhaust system configured to receive exhaust gas from the power block, a carbon capture system and a heat recovery system. The exhaust system is configured to couple the carbon capture system to the power block. The carbon capture system is configured to extract CO.sub.2 from the exhaust gas. The heat recovery system is configured to receive the extracted CO.sub.2 from the carbon capture system for providing heat energy to and from the power plant system.