189 results about "Geothermal power generation" patented technology

A valve arrangement (16) for a geothermal steam turbine generator (10) comprises first and second steam control valves (18, 20) for regulating the supply of steam to the steam turbine generator (10). The first and second steam control valves are arranged in parallel in a steam supply line (24) and the first steam control valve (18) has a smaller fully-open diameter than the second steam control valve (20). The first steam control valve (18) is arranged to regulate the volume flow rate of steam supplied to the steam turbine generator (10) during a speed-control phase, until the steam turbine generator (10) attains a predetermined rotational speed at which it can be connected to an ac electrical system. The second steam control valve (20) is arranged to regulate the volume flow rate of steam supplied to the steam turbine generator (10) during a load-control phase, after the end of the speed-control phase, once the steam turbine generator (10) has attained the predetermined rotational speed and is connected to the ac electrical system.

Two Geothermal energy harnessing devices, steam producing System, electricity production Method and heat energy Method are invented for mining renewable geothermal heat energy within a non-polluting, re-circulating, closed cycle intended for electricity generating applications or for other direct or indirect heat uses. The devices, the “Geothermal Energy Collector” and the “Geothermal Energy Exchanger” can work with a Depressurized Mixing Container and a Pressurized Storage Container the entirety of which comprises “THE GEOTHERMAL FLUID HEATING OR STEAM PRODUCTION SYSTEM. The system serves other equipment, such as a phase separator, steam turbine, generator and condenser, which working together with the system comprises either “THE GEOTHERMAL ELECTRICITY PRODUCTION METHOD” or “THE GEOTHERMAL HEAT ENERGY METHOD”. The GEC or GEE can work alone or within a system to add heat to any fluid and to use the heated fluid to supplement any appropriate technology, to produce electricity or for other direct or indirect uses.

A geothermal power system for production of power, and in particular electrical energy, utilizing naturally occurring geothermal energy sources and a method for identifying and converting manmade and natural geological formations into a substantial source of energy and at the same time providing remediation of environmental and safety hazards. Utilizing surface air that is substantially cooler than the geothermal temperature of the subterranean cavern an induced air flow will be produced. This naturally induced air flow will be harnessed and provide the energy to the system power plants for production of electrical energy.

A method and system for extracting geothermal heat from a well is provided, wherein the well casing has positioned therein an inner pipe nested within an outer pipe. The space between the well casing and the outer pipe may be filled with an insulating medium. A liquid heat conducting material flows into and down through the inner pipe. The inner pipe may be fitted with a one-way valve so that the liquid heat conducting material does not reverse direction and flow upwards towards the surface. As the liquid heat conducting material approaches the bottom of the inner pipe, it enters into a heat exchanger, absorbs heat and transforms to its gaseous state. The gas rises upward through the space between the outer pipe and the inner pipe and into the electricity generating component.

A heat exchange circuit for a geothermal plant comprising a well excavated in the rock, a casing arranged inside the well, integral with it and comprising at least a first perforated section extending along a first portion of the well and at least a second perforated section extending along a second portion of the well, the perforated sections allowing the exit and the entry of a flow of geothermal fluid contained in an aquifer, an internal duct, located inside the casing in which a heat transfer fluid flows, wherein the well, the casing and the internal duct being arranged as a substantially closed ring, except for at least one surface interruption, at least one heat-exchange section at the bottom of the well between the first portion and the second portion of the well within which the geothermal fluid transfers heat to the heat transfer fluid.

A geothermal heat exchanger 1 includes a water injection pipe 2 that is installed underground and to which water is supplied from above ground and a steam extraction pipe 3 that is installed underground so as to be contiguous to the water injection pipe 2. The steam extraction pipe 3 has a plurality of gushing ports 5 at its lower part, and pressure in the steam extraction pipe 3 is decreased approximately to pressure required by a turbine 6. The steam extraction pipe 3 is formed such that the diameter of the steam extraction pipe 3 becomes smaller from the lower side of the geothermal region toward the upper side of a ground surface G. Water supplied to the water injection pipe 2 becomes high-temperature pressurized water by heat supplied from the geothermal region 4, and gushes from the gushing ports 5 into the steam extraction pipe 3 in an atomized state, and is then converted into a steam single-phase flow, and allows a power generator 7 to conduct power generation. Furthermore, an air layer 19 is formed at the upper part of the water injection pipe 2 by lowering the water level of water that is supplied to the water injection pipe 2, and a heat insulating portion defined thereby is provided in a region contiguous to a low-temperature region 26 closer to the ground surface.

The present disclosure is directed to geothermal power generation systems. The systems can comprise a first separator is in fluid communication with the geothermal fluid source, the first separator having a high pressure steam outlet and a liquid fraction outlet. A high pressure turbine is in fluid communication with the high pressure steam outlet and is coupled to a first power generator. A high pressure condenser is in fluid communication with the high pressure turbine. A low pressure separator is in fluid communication with the liquid fraction outlet of the first separator, the low pressure separator being capable of separating steam from the liquid fraction outflow and providing low pressure steam through a low pressure steam conduit. A low pressure turbine is in fluid communication with the low pressure steam conduit, the low pressure turbine being coupled to a second power generator. A main condenser is in fluid communication with the low pressure turbine. Methods for generating geothermal power are also discussed.

A geothermal power generation system comprises a well heat collector and a heat collection water box connected with the well heat collector through a circulation well heat collector, wherein a heat conduction hot pipe connected with the well heat collector and the heat collection water box is provided with a hot pipe pump circulation device, and the well heat collector, the heat conduction hot pipe, the hot pipe pump circulation device and the heat collection water box form a hot water circulation loop. One end of a semiconductor temperature difference generator is provided with the heat collection water box, the other end of the semiconductor temperature difference generator is provided with a cold water box which is connected with a cooling water radiator through a cooling water circulation pipeline, the cooling water circulation pipeline connected with the cold water box and the cooling water radiator is provided with a cooling water pump circulation device, and the cold water box, the cooling water circulation pipeline, the cooling water pump circulation device and the cooling water radiator form a cooling water circulation loop. Two ends of the temperature difference generator form temperature difference to generate electricity, and thermal energy is converted into electricity energy. The geothermal power generation system is high in converting efficiency, and low in construction cost, thereby being capable of widely applied to conduct geothermal power generation.

The invention discloses a medium-low temperature geothermal power generation unit coupled with a Kallina cycle. The medium-low temperature geothermal power generation unit is structurally characterized in that a high-temperature heat regenerator, a generator, a separator, a turbine low-temperature heat regenerator and a condenser are in parallel connection with a first throttling valve between the high-temperature heat regenerator and the low-temperature heat regenerator to form a Kalina geothermal power generation system, wherein the high-temperature heat regenerator, the generator, the separator, the turbine low-temperature heat regenerator and the condenser are sequentially connected in series. A second condenser, a solvent pump, an evaporator, a throttling valve and an absorber are sequentially connected in series to form an absorbing temperature-increasing system. The throttling valves are connected to the separator, the absorber is connected with the high-temperature heat regenerator to ensure that the absorbing temperature-increasing system and the absorbent geothermal power generation are combined into the medium-low temperature geothermal power generation unit. The medium-low temperature geothermal power generation unit can generate absorbing temperature of about 100 DEG C, and reduces the exhaust temperature of geothermal wastewater to about 60 DEG C so as to achieve the purpose of improving the power generation efficiency of the unit by using low-level geothermal energy. According to the invention, working medium types and state parameters are coincident to the Kalina system without massively adjusting various items of parameters of the traditional system.

A plant for exploiting geothermal energy by circulating water or another fluid through a non-porous geological formation at a substantial depth below the earth surface, comprising multiple heat absorbing/production holes penetrating the said formation, with a total length of several kilometers and spaced more than 50 m apart. The production holes are connected to the surface by one single combined supply and return hole in which upward and downward flow is separated by a pipe comprising an insulating material and a seal. At the given positions of the common supply and return hole manifold zone designs connect the hole to the multiple production holes. The supply and return holes and production holes are closed circuits for transport of a fluid such as water through the said formation. A method for designing and establishing the plant is also disclosed.

The invention discloses a supercritical carbon dioxide geothermal power generation system and method. The system comprises a flashing loop valve, a flashing tank, a supercritical carbon dioxide loop valve, a turbine, an electric generator, a precooler, a compressor, an after-cooler, a fossil fuel power plant exhaust gas carbon dioxide collecting and treating device, an injection well, an output well and the like. The system can realize the purpose of developing geothermal resources and also can realize geological sequestration of carbon dioxide in exhaust gas of a fossil fuel power plant, so that the situation that the thermal power plant and geothermal exploitation are combined to generate electricity so as to realize zero emission of carbon dioxide becomes possible.

The invention provides an in-situ geothermal power generation system. The system comprises a heat pipe, a thermoelectric temperature difference power generation device and a magnetic levitation powergeneration device. The upper end of the heat pipe extends to the earth's surface or a water body. The lower end of the heat pipe is located at a geothermal source. A circulating cavity is formed in the heat pipe. A circulating working medium is arranged in the circulating cavity. The thermoelectric temperature difference power generation device is located at the lower end of the heat pipe. The magnetic levitation power generation device is located in the middle of the heat pipe. The thermoelectric temperature difference power generation device and the magnetic levitation power generation device output electric energy outwards through electric energy output ports correspondingly. According to the system provided by the invention, the heat pipe is directly buried deep underground, the heat pipe is located at the geothermal source, on the one hand, the thermoelectric temperature difference power generation device located on the lower segment of the heat pipe can directly convert geothermal energy into electric energy, on the other hand, a formed upward gaseous working medium drives the magnetic levitation power generation device in the middle of the heat pipe when the circulating working medium becomes the gaseous working medium during phase changing, geothermal energy is converted into mechanical energy which is then converted into electric energy, and the system has the advantages of geothermal in-situ power generation, low energy loss, high power generation efficiency and the like.

The invention relates to a single-screw expander medium and low temperature geothermal power generating system with an added lubricating oil cycle loop. The system is composed of a single-screw expander organic Rankine cycle loop module, a single-screw expander lubricating oil cycle loop module, a geothermal source cycle loop module, a cooling system cycle loop module and a power generating system module. A single-screw expander has the advantages of being suitable for the power range of medium and low temperature geothermal power generation, adaptable to wet steam to enter the expander to expand with liquid so that internal leakage of the expander can be reduced, and the system fully utilizes the characteristics of the single-screw expander, the high pressure organic working medium steam generated under heating of medium and low temperature geothermal sources is made to work through the expansion of the high pressure organic working medium steam to drive a power generating set, therefore, high heat efficiency is obtained, and power generating capacity is improved. The system reduces the high risks of the geothermal temperature to geothermal resource exploration and the difficulty of exploring and recharging geothermal resources, effectively uses the potential heat of working media, improves the utilization rate of energy resources and the cycle heat efficiency of the geothermal power generating system, and reduces cycle irreversible loss.

A geothermal power generation system using heat exchange between working gas and molten salt includes a heat collecting unit. A plurality of molten salt containing units are disposed in a heat transferring unit at predetermined intervals from each other. A heat exchanging unit transfers a heat source of the heat collecting unit to the molten salt in the plurality of molten salt containing units. The heat transferring unit is disposed in the ground. Working gas which receives the heat source of the molten salt via heat exchange enters and exits the heat transferring unit. A turbine unit is connected to the heat transferring unit, and generates mechanical energy using energy of the working gas. A power generating unit is connected to the turbine unit, and generates electrical energy using the mechanical energy.

Disclosed is a geothermal power generation device. The geothermal power generation device comprises a heat exchanger and a circulating sealed heat conducting pipe, wherein the heat exchanger is installed inside a geothermal well, and the circulating sealed heat conducting pipe is arranged inside the heat exchanger and penetrates out of the heat exchanger. A heat conducting medium is installed inside the heat conducting pipe. The portion, penetrating out of the heat exchanger, of the heat conducting pipe is arranged on the surface of a hot end of a temperature difference generator. A flow gauge and a circulating pump are arranged on the section, arranged outside the heat exchanger and connected with the temperature difference generator, of the heat conducting pipe. The circulating pump is connected with an output end of a controller. An input end of the controller is connected with a temperature sensor arranged inside the heat exchanger. A cold end of the temperature difference generator is provided with a cold water pipe. One end of the cold water pipe is connected with a water injection port of the cold water pipe. A condenser and a cold water valve are installed between the cold water pipe and the water injection port of the cold water pipe. The temperature difference generator is connected with a storage cell. The geothermal power generation device is simple in structure, stable in operation, capable of continuously generating electric energy, free of environmental hazards, free of the requirement for discharging water out of the geothermal well, free of the requirement for large-scale devices like a steam turbine, and high in environmental benefit.

The invention discloses a low-temperate geothermal power generation system comprising a low-temperature geothermal well vertical shaft, a series pressure energy engine block and a low-speed generator unit. A closed well pipe is arranged in the vertical shaft. A complex liquid working medium is contained in the closed well pipe. The closed well pipe is connected with a gas output pipe through a gas input pipe, the engine block and an exhausted gas output pipe in sequence, so that a closed loop is formed. The engine block is connected with the low-speed generator unit. A liquid working medium condensing box is arranged between the exhausted gas outlet pipe and a gas output pipe. The low-temperate geothermal power generation system has the advantages of being ingenious in structural design, achieving liquid-gas two-phase flow work and operating safely and stably. By the adoption of the low-temperature geothermal power generation system, shallow low-temperature geotherm at the temperature of 30-80 DEG C can be used for generating power, and the well drilling cost and the power generation cost can be reduced; besides, due to a closed well, the well pipe is prevented from being scaled; meanwhile, geotherm instead of water is pumped from a geothermal well, and therefore the low-temperate geothermal power generation system is suitable for generating power through hot dry rock stratums accounting for 99% of geotherm.

A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40 ° C.