Direct-fired supercritical carbon dioxide (CO.sub.2) power cycle that generates hydrogen. More specifically, the discharge of a direct fired supercritical CO.sub.2 power cycle is converted to carbon dioxide and hydrogen where the hydrogen and/or carbon dioxide can be separated and stored/utilized in another application.

Direct-fired supercritical carbon dioxide (CO.sub.2) power cycle that generates hydrogen. More specifically, the discharge of a direct fired supercritical CO.sub.2 power cycle is converted to carbon dioxide and hydrogen where the hydrogen and/or carbon dioxide can be separated and stored/utilized in another application.

An apparatus for converting thermal energy into mechanical energy by a cycle, having a heat exchanger, a reservoir for an operating medium, a feed line, a turbine, and a return line having at least one recovery device is described. In order to also be able to utilize waste heat for the generation of electrical energy, the turbine is embodied as a disc rotor turbine. A method for converting thermal energy into mechanical energy in a cycle is also described, in which thermal energy is supplied to an operating medium in a reservoir, the operating medium evaporates and/or a pressure in the operating medium is increased, whereupon the operating medium releases energy in a turbine, after which the operating medium is returned to the reservoir.

An apparatus for converting thermal energy into mechanical energy by a cycle, having a heat exchanger, a reservoir for an operating medium, a feed line, a turbine, and a return line having at least one recovery device is described. In order to also be able to utilize waste heat for the generation of electrical energy, the turbine is embodied as a disc rotor turbine. A method for converting thermal energy into mechanical energy in a cycle is also described, in which thermal energy is supplied to an operating medium in a reservoir, the operating medium evaporates and/or a pressure in the operating medium is increased, whereupon the operating medium releases energy in a turbine, after which the operating medium is returned to the reservoir.

It is provided a power generation model based on a transcritical cycle with an increasing-pressure endothermic process using CO.sub.2-based mixture working fluids for an enhanced geothermal system, including a geothermal water circulation, a mixture working fluid circulation and a cooling water circulation. A coaxial pipe-in-pipe downhole heat exchanger is provided in the mixture working fluid circulation. Innovations are reflected in that an increasing-pressure endothermic process is achieved due to making use of gravity and hence increase a heat quantity absorbed in a cycle, thereby improving power generation quantity of the cycle; and a binary mixture working fluid composed of CO.sub.2 and an organic working fluid is adopted to realize a transcritical power cycle with an increasing-pressure endothermic process and a decreasing-temperature exothermic process, thereby effectively reducing irreversibility of a heat transfer between a working fluid and a heat source and improving power cycle efficiency.

The combined cycle power device of the present invention belongs to the field of energy and power technology. A combined cycle power device comprises an expander, the second expander, a compressor, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. An evaporator connects the second expander. The condenser passes through a pump and connects the evaporator. The second expander passes through the second high-temperature heat exchanger and connects the high-temperature heat exchanger. The compressor connects the high-temperature heat exchanger. The high-temperature heat exchanger connects an expander. The evaporator connects the compressor and the condenser. The expander connects the evaporator. The high-temperature heat exchanger and the second high-temperature heat exchanger connect the outside. The condenser connects the outside. The expander and the second expander connect the compressor and transmit power.

The combined cycle power device of the present invention belongs to the field of energy and power technology. A combined cycle power device comprises an expander, the second expander, a compressor, a pump, a high-temperature heat exchanger, the second high-temperature heat exchanger, a condenser and an evaporator. An evaporator connects the second expander. The condenser passes through a pump and connects the evaporator. The second expander passes through the second high-temperature heat exchanger and connects the high-temperature heat exchanger. The compressor connects the high-temperature heat exchanger. The high-temperature heat exchanger connects an expander. The evaporator connects the compressor and the condenser. The expander connects the evaporator. The high-temperature heat exchanger and the second high-temperature heat exchanger connect the outside. The condenser connects the outside. The expander and the second expander connect the compressor and transmit power.

In a method of hybrid power generation in an environment with a gas pressure below the earth's atmospheric pressure, liquid water is extracted from a subsurface water ice deposit by pumping superheated-supercritical fluid heated by a heater through an extraction well into the subsurface water ice deposit in order to form a liquid water reservoir. Liquid water is pumped from the liquid water reservoir through the extraction well to the buffer tank. The liquid water is pumped from the buffer tank into a high pressure feeder system (HPFS) and a low pressure feeder system (LPFS), which are each also heated by the heater. The HPFS outputs supercritical water and the LPFS outputs flash steam into a combined injector and the mixture is injected into a turbine at near environmental pressure. This mixture explosively expands into superheated steam and passes through the turbine, powering an electrical generator.

In a method of hybrid power generation in an environment with a gas pressure below the earth's atmospheric pressure, liquid water is extracted from a subsurface water ice deposit by pumping superheated-supercritical fluid heated by a heater through an extraction well into the subsurface water ice deposit in order to form a liquid water reservoir. Liquid water is pumped from the liquid water reservoir through the extraction well to the buffer tank. The liquid water is pumped from the buffer tank into a high pressure feeder system (HPFS) and a low pressure feeder system (LPFS), which are each also heated by the heater. The HPFS outputs supercritical water and the LPFS outputs flash steam into a combined injector and the mixture is injected into a turbine at near environmental pressure. This mixture explosively expands into superheated steam and passes through the turbine, powering an electrical generator.

The combined cycle power device in the present invention belongs to the field of energy and power technology. A combined cycle power device comprising an expander, the second expander, a compressor, the third expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator. An evaporator connects the second expander has a vapor channel connected the that a condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator. The second expander connects the high-temperature heat exchanger. A compressor connects the high-temperature heat exchanger. The high-temperature heat exchanger connects an expander. The evaporator connects the compressor and the third expander respectively has a vapor channel connected the that the expander connects the evaporator. The third expander connects the condenser. The high-temperature heat exchanger connects the outside. The condenser has the cooling medium channel. The expander, the second expander and the third expander connects the compressor.