436 results about "Geothermal water" patented technology

The present invention relates to a geothermal water heater system, and methods of heating water for domestic uses utilizing geothermal energy. More specifically, the present invention provides a geothermal heat pump water heater system includes a hot water tank, a cold water tank and at least one water-to-water heat pump. As contemplated, the water-to-water heat pump includes one or more heat exchangers which control heat transfer from water drawn from an outside water source. The outside water source water is supplied to both the hot water tank and the cold water tanks whereupon heat exchangers which comprise a cold water side heat exchanger and a hot water side heat exchanger, allow water entering the cold water tank to be cooled and returned to the cold water tank while water entering the hot water tank is heated and returned to the hot water tank.

The invention offers a method of exploiting seabed hydrate. It includes the following steps: using at least two well arrays to form a injecting exploiting well array; using horizontal or deflected section to connect with water injection well and gas production well at hydrate layer; transferring carried heat quantity to hydrate to make it decompose; exploiting the decomposed natural gas; separating gas and water; injecting the separated water to deep part geothermal water layer. The invention combines heating and decompression. The invention has the advantages of simple equipment, convenient operation, and environmental protection. It can apply in large scale exploiting seabed hydrate.

The invention relates to an energy supply system mainly through gas and steam combined cycle cogeneration, and belongs to the technical field of energy sources. The system adopts a mode of combined heating of a smoke condensing heat exchanger, a condenser, a steam absorption heat pump, a high-temperature smoke heat exchanger and a steam-water heat exchanger on a heat source side; return water of a heat supply network directly recovers low-temperature smoke condensed waste heat, high-temperature smoke waste heat or condensed steam waste heat; and simultaneously, the steam absorption heat pump driven by extracted steam is used for recovering condensed steam discharged heat or partial smoke waste heat. During heat supply in winter, a client uses a supplementary-fired hot water absorption heat pump and a water-water heat exchanger to heat secondary water in the heat supply network for heat supply and extract low-grade heat for heat supply from a superficial layer soil source, an underground water source or a geothermal water source; and in summer, the client uses the hot water absorption heat pump to refrigerate hot water in the heat supply network and a liquid desiccant air conditioner to remove humidify and preheat domestic hot water. Compared with the conventional system, the system of the invention has good economy and application prospect; and the energy utilization rate of the system is greatly improved.

A double-pipe geothermal water circulating apparatus including an outer pipe having a geothermal water supplying strainer for infiltrating geothermal water from an aquifer and a geothermal water returning strainer for returning used geothermal water to the aquifer, a thermal insulation inner pipe composed of a thermal insulator that forms a flow channel with the outer pipe, a pump for pumping the geothermal water from the thermal insulation inner pipe, a heat source supplying force feed pipe for force-feeding pumped geothermal water to an heat exchanger and a heat source reusing pipe connected to the flow channel for returning the used geothermal water to the aquifer. Also, the double-pipe geothermal water circulating apparatus is provided therein with the flow channel from the geothermal water returning strainer to the geothermal water supplying strainer that is not separated, whereby geothermal water can flow therethrough.

Media compositions for use in wastewater treatment, stormwater treatment, CSO treatment and greenroof stormwater management systems as filtration media, plant growth media or pollutant retention media. Media composition includes at least one of a recycled material selected from a group consisting of tire crumb, wood sawdust and paper and a naturally occurring material selected from a group consisting of sand, limestone, sandy clay, expanded clay, organics used for processing geothermal water, organics used for agricultural drainage basins and filtration, and organics for aquaculture drainage and organics used for silviculture and forest drainage, and organics used as growing media.

The system and method to reduce the temperature of geothermal water to increase the capacity and efficiency while decreasing the costs associated with a geothermal power plant construction uses a high efficiency steam turbine. The steam turbine lowers the high temperature geothermal resource so it can be used in parallel with an innovative low temperature Organic Rankine Cycle (ORC) geothermal power plant to increase the efficiency and capacity while at the same time to reduce the costs associated with constructing the power plant because of logistics, labor and material.

The invention provides a method for preparing a manganese series lithium-ion sieve adsorbent H4Mn5O12 and a precursor thereof, relating to a preparation method of an inorganic adsorbent for absorbing lithium from liquid lithium resources such as salt brine, seawater, geothermal water and the like. In the preparation method, manganese salts and lithium salts with low melting points are taken as raw materials, organic carboxylic acid is used as an ingredient, the precursor Li4Mn5O12 is obtained through soft chemical synthesis and low-temperature roasting; acid treatment is carried out on the precursor, and Li in the precursor is extracted to be converted to an H-type ion sieve represented by H4Mn5O12 or MnO2.0.31H2O; and the H-type ion sieve H4Mn5O12 is filtered, washed and dried to obtain the adsorbent capable of sieving lithium ions. The method of the invention has simple process, and the obtained ion sieve has the advantages of small dissolving loss, fast adsorption rate and high adsorption capacity.

The invention discloses an ecotype enclosed method for culturing fish through circulation water. Natural seawater, underground salt water, underground fresh water and geothermal water are mainly utilized and mixed, and an industrial culture foundation for producing pollution-free healthy seafood is built and used. A solid-liquid separation purification device is used for replacing sand filtration of a biological filter, ammonia nitrogen and nitrite nitrogen are degraded after water passing through a biological film on biological filler in the biological filter, and the total purification rate of water body particles is over 99%. An aeration pond is arranged to conduct aeration and oxygenation on a culture water body to enable the content of dissolved oxygen in water in a fish culture pond to be kept at 8-14mg / L, finally the water body is sterilized through ultraviolet light, clean ecological water is input into the fish culture pond, and the return water in the fish culture pond is purified repeatedly and utilized in a circulating mode. Sewage discharged from a culture system is purified by an open-air pond and flows back to a water storage sedimentation pond to achieve zero-discharge complete enclosed circulation water factory-like fish culture.

The invention relates to a granular lithium ion sieve, which is used for extracting lithium from (metal) lithium-containing solution such as salt lake brine, seawater, well brine or geothermal water and the like. The granular lithium ion sieve is prepared by cladding lithium ion sieve powder into a polymer in the process of forming a cross-linked polymer through the reversed phase suspension polymerization of an acrylate monomer. The granular lithium ion sieve has the advantages of high mechanical strength, high selectivity, high adsorbance, high adsorption rate (the adsorbance is 2 mmol*g<-1> in one hour) and high stability. The foundation is provided for extracting the lithium from the salt lake brine by an ion sieve adsorption method.

The invention discloses a solar energy-ground source heat pump-floor radiation heating combined heating system. The system comprises a solar thermal collector, a heat storage water tank communicated with the solar thermal collector, a horizontal ground heat exchanger, a heat pump unit and a geothermal water well, wherein the inlet and outlet of the horizontal ground heat exchanger are communicated with a second outlet and a second inlet of the heat storage water tank, the water outlet and water inlet of the condenser of the heat pump unit are communicated with the inlet and outlet of the horizontal ground heat exchanger, the water inlet of the evaporator of the heat pump unit is connected with the third outlet of the heat storage water tank through the forth liquid inlet pipe of a second circulation pump group which is arranged on the water inlet, and the water outlet thereof is connected with the third inlet of the heat storage water tank through the forth liquid inlet pipe of a fifth electromagnetic valve which is arranged on the water outlet; and the geothermal water well is connected with the forth liquid inlet pipe through the fifth liquid outlet pipe of a submerged pump group which is arranged on the geothermal water well, and one end of the fifth liquid inlet pipe of a sixth electromagnetic valve which is arranged on the geothermal water well is communicated with the forth liquid outlet pipe. By adopting the method of the invention, the coefficient of performance of the heat pump unit can reach above 5.0.

The invention belongs to the technical field of greenhouses and relates to a greenhouse utilizing heat of underwater to achieve heat preservation, in particular to a geothermal greenhouse. The geothermal greenhouse comprises a closed heat-preservation greenhouse body which adopts a combined frame structure. A wall body on one side of the greenhouse is a water curtain radiation wall which comprises a wall foundation and geothermal water curtain radiators, a wall body opposite to the water curtain radiation wall is a fan wall where a plurality of fans are arranged side by side, and the ground of the greenhouse adopts a floor heating system with built-in radiation pipes. The geothermal greenhouse fully utilizes heat of the underwater, is high in heat exchange efficiency, achieves environment-friendly and pollution-free heating, and has excellent environment-friendly effect.

The invention relates to a comprehensive power generation method and a device thereof, which uses high-pressure high thermal energy fluid separated by an oil-gas-water separator, and adopts the method that the water processed by the oil-gas-water separator is discharged from a water outlet pipeline, and then enters a hydroelectric generator unit and / or a geothermal water power generation unit, wherein, the hydroelectric generator unit uses pressure energy and mechanical energy for producing water to drive a generator to generate power and uses geothermal energy of the produced water from separation to drive a steam turbine to generate power, and uses terrestrial heat for heating, thereby realizing the comprehensive, high-efficient and cascade utilization of the energy of the strata output; the gas processed by the oil-gas-water separator enters a turbine power generation unit via a natural gas outlet pipeline and is used for driving the steam turbine to generate power. The method has the beneficial effects that the pressure energy, thermal energy and gravitational potential energy of the water and the gas processed by the oil-gas-water separator are comprehensively used for pushing an impeller of a prime motor to rotate and driving the generator to generate power, thus realizing the purpose of using the residual energy and pressure producing the discharged water and gas for pushing the water turbine or a gas turbine to generate power, realizing the utilization of the residual energy and pressure, providing clean and unpolluted power source for oil fields, reducing the consumption of fossil energy, and realizing energy conservation and emission reduction.

The invention provides a system for collecting thermal energy from underground deep high-temperature rock with low porosity and low permeability. The system comprises a thermal production well, at least one fracturing well, a full-closed casing pipe, a ground thermal energy utilizing device and a pipeline circulation system, wherein the fracturing wells are located near the thermal production well, meshed cracks are formed in the underground deep high-temperature rock according to a fracturing method, an artificial geothermal reservoir is formed, and a thermal energy collecting section of thethermal production well is partially or wholly wrapped with the artificial geothermal reservoir; and the pipeline circulation system is used for making a heat exchange working medium flow downwards inthe casing pipe along an interlayer and then circulate upwards through a center pipe. With the closed design, matter exchange with the underground environment is avoided, the defects of high energy consumption, needs to reinjection, ground thermal pollution, chemical pollution and ground collapse due to direct use of geothermal water are overcome, and the heat exchange efficiency of a closed deepunderground heat exchange system is improved in an artificial fracturing mode.

The invention provides a salt lake brine evaporation method and equipment thereof, and a salt lake brine treatment method by utilizing the salt lake brine evaporation method and a device thereof. The salt lake brine evaporation method comprises the following steps: step A: carrying out natural freezing icing of salt lake brine by relying on a low temperature condition, wherein a liquid phase is a pre-concentrated brine; step B: before, during and / or after removing ice, carrying out open-air natural evaporation of the pre-concentrated brine, so as to allow a part of salt in the pre-concentrated brine to be precipitated from the pre-concentrated brine, separating the precipitated salt, and thus obtaining a concentrated brine; and step C: carrying out open-air evaporation and geothermal water heating evaporation of the concentrated brine obtained in the step B at the same time, and thus obtaining a high concentrated brine. Solar energy resources, cold resources and geothermal resources are fully utilized, so that the evaporation velocity of the brine and the brine preparing efficiency are significantly improved.

The invention relates to a novel geothermal and optothermal cogeneration system, which is characterized by comprising a geothermal evaporator, a solar overheater, a prime motor, a prime motor exhaust port, a working medium compression device, an air-cooling radiator, a liquid storage tank and a working medium booster pump. The solar overheater, the prime motor, the prime motor exhaust port, the working medium compression device, the air-cooling radiator, the liquid storage tank and the working medium booster pump are sequentially communicated with the geothermal evaporator; and the prime motor is respectively communicated with the working medium compression device and the air-cooling radiator through a three-way reversing valve. The invention has the advantages that a substance with a lowboiling point is used as a working medium for power and refrigeration circulation, the medium-temperature and low-temperature geothermal heat can be used as a heat source for evaporation of the working medium, solar energy is adopted as an overheating source for the working medium, and the geothermal evaporator is arranged in a downhole. The circulating working medium is delivered into the evaporator at the bottom of a geothermal well for evaporation to absorb heat of geothermal fluid, geothermal hot water needs not to be pumped to the surface, the evaporation temperature of the working medium can be increased, well backfilling can be eliminated, corrosion and scaling can be reduced, and the service life of the system can be prolonged. Moreover, the system has a simple and reasonable structure and good economical performance in heat for power generation.

The invention provides a terrestrial heat tail water treating process which comprises the following steps: (1) controlling the tail water temperature after the terrestrial heat water is subjected to heat energy gradient utilization to be less than 45 DEG C; (2) aerating the terrestrial heat tail water by using an aeration tower; (3) flowing the aerated terrestrial heat tail water through a manganese sand filter to be filtered; (4) carrying out membrane integrated treatment on the filtered terrestrial heat tail water by using a double-membrane method process; (5) carrying out boron selective resin absorption treatment on the reverse osmosis water; and (6) filtering the effluent subjected to boron removal by using an active carbon filter and conveying to a use point. Aiming at the harmful ingredients and pollutant types in terrestrial heat tail water, the invention integrates a plurality of water treatment unit techniques, realizes integration and optimization of process systems, is wide in water quality application range of the terrestrial heat tail water, advanced in process and reliable in technique, and has practical popularization and application values in development and utilization in terrestrial heat tail water, and as a result, significant social, economic and environmental benefits are achieved.

The invention discloses a horizontal three-channel circulating water fish breeding method. Mainly, natural seawater, underground salt water, underground fresh water and geothermal water are distributed and purified and recycled in a circulating mode, and then an industrialized breeding base for producing pollution-free healthy seafood is established. The method has the advantages that water is supplied to fish breeding pools through water feeding channels, the upper portions of the fish breeding pools, a water pump tank, a water distribution pool, a biofilter, an ultraviolet sterilization pool, a water feeding pool, the water feeding channels and other facilities are all built on the same horizontal plane, and therefore no water level difference is generated, and the lift of a circulating water pump is reduced; the fish breeding pools on two rows in one fish breeding workshop share one circulating water purification facility, and the aims of saving energy, being efficient and reducing cost are achieved.

The invention discloses a paddy rice planting method. The existing planting method can only plant paddy rice in specific seasons of a year; the paddy rice planting method is characterized in that heating pipelines are laid in rice soil; a deepwater well is arranged; heat absorption pipelines are used for extracting terrestrial heat from the deepwater well so as to transmit the terrestrial heat tothe heating pipelines; and the stream flow in the heating pipelines are discharged through a drainage pipeline. The heat absorption pipelines can be used for directly sucking geothermal water from thedeepwater well so as to extract terrestrial heat which is transmitted to the heating pipelines; and also, the middle parts of the heat absorption pipelines extend into the deepwater well, the streamflow is transmitted into the heat absorption pipelines and heated in the deepwater well so as to extract terrestrial heat which is then transmitted to the heat pipelines; and water source with propertemperature can be adjusted to irrigate rice fields. The paddy rice planting method leads the heating pipelines to heat the rice fields so as to form a 'paddy field hotbed', increases the output in the seasons suitable for planting the paddy rice under natural conditions, and also can plant the paddy rice in the seasons which are not suitable for planting the paddy rice under natural conditions. No pollution is generated, ground water can be utilized repeatedly, the energy is saved and the environment is protected.

The invention relates to a multi-medium heat storage type warming water tank, which is a warming water tank for storing heat by using media such as electromagnetic oven heated water and the like, infusing hot water by using a manual or electric water feeding device and achieving heat storage and warming by using electricity, fuel combustion, hot water of a solar water heater and geothermal water. The warming water tank comprises a warming panel, a warming cavity, a plastic or metal plate, a cotton cloth layer and a water cavity, wherein the water cavity is provided with a water inlet pipe, a water outlet pipe, a stainless iron warming plate and a special bearing rack; a heat insulation layer and a plastic (or metal) protective shell are arranged outside the water cavity; the warming water tank for hands and feet of a single person is provided with a detachable heat insulation base; a water passage of the warming water tank for feet of multiple persons is provided with a three-way pipe and a heat resistant pipe connected with a water pipe of the water cavity; and the warming water tank mainly applied to warming of households and individuals and warming of feet of multiple persons also can supply hot water and shower, the heating transfusion device type warming water tank can be used for warming, and the manual or electric water feeding device is used for feeding water to the water tank. The warming water tank has the advantages of convenient operation, safety, environmental protection, energy conservation, sanitation, warming comfortableness, duration, high utilization of heat efficiency, wide available energy and durability.

The invention discloses an ammonia water mixed working medium-based combined cooling and power supply system for utilization of geothermal energy. Geothermal water enters a flash vessel; vapor generated by flashing under reduced pressure enters a first steam turbine to apply work; and the residual geothermal water in the flash vessel enters a vapor generator to heat the ammonia water basic solution and then recharge underground. The ammonia water basic solution is subjected to heat absorption in the vapor generator and enters a first separator to separate out saturated ammonia-enriched vapor; dead steam generated after the saturated ammonia-enriched vapor applies work in a second steam turbine II enters a second separator to separate out saturated ammonia-enriched vapor at higher concentration; the saturated ammonia-enriched vapor is cooled and depressurized and enters an evaporimeter to absorb latent heat to form low-pressure saturated ammonia-enriched vapor and generate refrigerating output. The low-pressure saturated ammonia-enriched vapor passing through the evaporimeter and ammonia-enriched aqueous solution at different concentration generated by the two separators are mixed to form the ammonia water basic solution, and the ammonia water basic solution enters the vapor generator after being condensed and pressurized.

A double-pipe geothermal water circulating apparatus including an outer pipe having a geothermal water supplying strainer for infiltrating geothermal water from an aquifer and a geothermal water returning strainer for returning used geothermal water to the aquifer, a thermal insulation inner pipe composed of a thermal insulator that forms a flow channel with the outer pipe, a pump for pumping the geothermal water from the thermal insulation inner pipe, a heat source supplying force feed pipe for force-feeding pumped geothermal water to an heat exchanger and a heat source reusing pipe connected to the flow channel for returning the used geothermal water to the aquifer. Also, the double-pipe geothermal water circulating apparatus is provided therein with the flow channel from the geothermal water returning strainer to the geothermal water supplying strainer that is not separated, whereby geothermal water can flow therethrough.

The invention discloses a same-layer recharge electric heating pump type gradient utilization heating system, and is widely suitable for geothermal heating. The system mainly consists of two parts of a heating circulating system and a heat supply circulating system; the heating circulating system mainly consists of a water picking pump, a water picking well, a plate heat exchanger, a first valve, a second valve, an electric heat pump, a recharge well, a third valve and a fourth valve; and the heat supply circulating system mainly consists of a fifth valve, a heat user, a sixth valve, a seventh valve, an eighth valve, a ninth valve and a tenth valve. Clean and environment-friendly geothermal resources are developed and used; a low-temperature afterheat utilization technology of the electric heat pump is combined to realize deep gradient utilization of geothermal water; and the system is excellent in economic benefit and environmental protecting benefit, and has such advantages as cleanness, environmental protection, universality and applicability.

The present invention relates to a high carbon molecule heating oil energy-saving electric water heater, comprising a shell, an upper cover plate and a lower cover plate. The shell is combined with the upper cover plate and the lower cover plate into a main vessel, wherein, the main vessel is filled up with high carbon molecule heating oil, and a heat exchange coil pipe exchanging heat with the high carbon molecule heating oil is arranged in the main vessel; the outer side of the main vessel is provided with a water inlet collecting pipe and a water outlet collecting pipe; the water inlet collecting pipe and the water outlet collecting pipe are respectively communicated with the heat exchange coil pipe in the main vessel; activating electrodes used to activate and heat the high carbon molecule heating oil to proper temperature and electric heating pipes are inserted into the high carbon molecule heating oil inside the main vessel along the upper cover plate. The present invention uses the high carbon molecule heating oil as a heat exchange medium, effectively improves the work efficiency, saves electrical energy, reduces operation cost, can get better temperature of geothermal water especially through the design that the water inlet collecting pipe and the water outlet collecting pipe are respectively and mutually communicated with the heat exchange coil pipe in the main vessel, and avoids the prior design of additional water tank, which simplifies structure and strengthens practicality.

Disclosed is a power generation system for performing gradient utilization on geothermal energy and solar energy. The system comprises 5 loops of a geothermal water loop, a solar energy heat collection working medium loop, a heat storage medium loop, a water / steam loop and a cooling water loop. The geothermal energy is used for heating working media of water of a steam turbine to a saturation condition, and the solar energy is used for heating the water to a superheat state and reheating exhaust of a high-pressure cylinder of the steam turbine, accordingly, the gradient utilization of the geothermal energy and the solar energy is achieved, and the thermal efficiency of the power generation system can be improved greatly; simultaneously, sealed operation of geothermal water is achieved, and environment pollution cannot be caused; and the geothermal water loop keeps positive-pressure operation, problems of scaling, corrosion and the like of equipment are solved, and the operation cost is reduced. Besides, an energy storage system is utilized, so that the storage and the release of the solar energy are achieved, and efficient operation of the power generation system without sunlight is guaranteed.

The invention provides a device system and method for achieving carbon dioxide cyclic power generation through geothermal energy. The disclosed system comprises a liquid CO2 storage tank, a high-pressure pump / compressor, a geothermal energy CO2 energy storage device, a terrestrial heat production well, a steady flow adjuster, a turbine / piston expander, a power generator, a cooler and a CO2 compressor. The invention further discloses a method, in the method, low-pressure liquid CO2 fluid serves as a working medium, geothermal water and low-temperature CO2 fluid exchange heat with each other to form supercritical CO2 fluid different in temperature, pressure and energy density, then the equal-pressure supercritical CO2 fluid is achieved through adjustment of the steady flow adjuster, and then power generation is conducted. According to the device system and the method, heat energy in the geothermal water with the temperature ranging from 70 DEG C to 300 DEG C in the terrestrial heat production well is adopted for conducting energy storage on the liquid CO2, carbon dioxide cyclic power generation is achieved after tempering, the heat energy can be efficiently recycled, and high heat efficiency is improved; and energy in the terrestrial heat is effectively stored and utilized, and flexible adjustment and utilization of energy are achieved.

The invention relates to a geothermal tail water recharge technology in geothermal exploitation and utilization process. Besides a geothermal well, the overall system mainly adopts geothermal water desanding devices, sub-catchments, a heat exchange device, frequency conversion pressurizing devices, a degassing device, a tail water filter and an electric control valve. Through the adjustment of the system, functions of the exploitation and the recharge of the geothermal well are converted, cumulative blockade caused by long term recharge of a simple opening geothermal well is eliminated, and the chronicity of the recharge is ensured; through the adoption of a standby filter, the sustainability and the continuity of the recharge process are ensured; three-level filters with different precisions are coordinated and adopted, besides, PID control with an automatic regulatory function and enabling the overall system to realize automatic frequency rising and lowering of pressure pumps and opening degree of the electric control valve is designed, and mutual interference between exploitation and recharge of the geothermal well is eliminated. The system is suitable for sandstone stratums in various areas, through the adoption of the system, economical and effective recharge can be conducted on tail water after the geothermal comprehensive utilization, and sustainable development of geothermal exploitation and utilization can be ensured.

The invention discloses a geothermal underground water level measuring system. A metal hammer is fixed through molybdenum wire; after the molybdenum wire passes through a reversing pulley and is wound on a winding pulley for several circles, the end of the molybdenum wire is fixed with a distance measuring pulley. A distance measuring pulley shaft is connected with a speed reducer; and a step motor is connected with a shaft of the speed shaft. The startup, the stoppage and the rotating direction of the step motor are controlled through a control system. The speed reducer and the distance measuring pulley are connected in order that the distance measuring pulley produces moment; thus, when power is cut off, the position of the metal hammer is kept unchanged. The metal hammer and a well measuring tube form two electrodes; when the metal hammer is contacted with the water surface, a circuit is switched on, and the control system can calculate the length of the molybdenum wire wound on the distance measuring pulley according to a pulse signal emitted by a sensing switch of the distance measuring pulley, thereby determining the position of the water surface of the underground well. All the measuring and controlling devices are positioned on the ground; and the system does not need to mount any electronic testing probe underground and can effectively solve the problem that the testing probe is easy to damage caused by high temperature of geothermal water, strong corrosion and untight sealing of the probe.

The invention provides a geothermal energy gradient utilization combined heat and power generation device and method. A geothermal well, a gas-liquid separator, a turbine, a condenser, a first-level evaporator, an expander, a heat exchanger and a recharge well are included. A geothermal water outlet of the geothermal well is connected with an inlet of the gas-liquid separator. A high-temperature water steam outlet of the gas-liquid separator is connected with an inlet of the turbine, and an outlet of the turbine is connected with an inlet of the recharge well through the condenser. A high-temperature liquid outlet of the gas-liquid separator is connected with a water inlet of the first-level evaporator, a high-temperature organic working medium outlet of the first-level evaporator is connected with an inlet of the expander, and a low-temperature organic working medium outlet of the expander is connected with a low-temperature organic working medium inlet of the first-level evaporator.A low-temperature water outlet of the first-level evaporator is connected with a heat side inlet of the heat exchanger, and a heat side outlet of the heat exchanger is connected with the inlet of therecharge well. The heat exchanger is further connected with external equipment. The system utilizes the part of hot water, comprehensive gradient utilization of geothermal energy is achieved, and theenergy utilization efficiency of the geothermal energy is improved; and meanwhile, power generation and heat supply are conducted, and combined heat and power generation is achieved.