Geothermal power generation system combining organic working medium and steam

Abstract

An organic working medium and steam combined geothermal power generation system comprises a steam power generation system, and the steam power generation system comprises an evaporator, a steam turbine, a mixed condenser and a first recharge pump which are connected in sequence; comprising an organic working medium power generation system, the organic working medium power generation system comprises an organic working medium evaporator, an organic working medium turbine, a surface type condenser and an organic working medium pump which are sequentially connected, the steam power generation system and the organic working medium power generation system are communicated through a valve, and the steam power generation system takes water from a geothermal exploitation well. Compared with the prior art, by means of gradient utilization of high-temperature geothermal water, geothermal resources are utilized to the maximum extent, the power generation capacity per ton of water is improved, and meanwhile the power generation efficiency and the power generation capacity of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal power generation, in particular to a geothermal power generation system combining organic working fluid and steam. Background Technique

[0002] Geothermal power generation is a power generation method that converts underground geothermal energy into mechanical energy and then into electrical energy. The commonly used geothermal power generation systems include the following two types: one is a steam power generation system. Most of the geothermal resources in China are geothermal water, which needs to be depressurized and flashed into steam. The generated steam is guided to a steam turbine. The steam turbine is connected to a generator through a shaft. Driven by the steam turbine, the rotor of the generator rotates and cuts the magnetic field lines, generating alternating current according to the principle of electromagnetic induction.

[0003] Among them, for the geothermal water depressurization and flashing technology, using the characteristic that geothermal water suddenly boils to generate steam when the pressure drops, the lower the pressure drop, the higher the steam production of geothermal water. However, the greater the pressure reduction range, the higher the electricity cost. When combined with the power generation of geothermal water steam, the actual power generation efficiency is very low; and when the pressure reduction range is smaller, the steam production of geothermal water is very small, and the geothermal water resources are not fully utilized, and the efficiency of steam power generation is very low.

[0004] The other is an organic working fluid power generation system, which is a technology for generating electricity using low-temperature heat sources. It converts low-grade heat energy into high-grade electrical energy, but limited by the stability of the heat source, it will also lead to a phenomenon of low power generation efficiency and high system investment.

[0005] In order to overcome the disadvantages of the above two systems, a geothermal power generation system combining organic working fluid and steam is designed. Content of the Utility Model

[0006] The utility model aims to overcome the defects in the above-mentioned prior art and provides a geothermal power generation system combining organic working fluid and steam, which couples the steam power generation system and the organic working fluid power generation system, gives play to the advantages of the two independent systems, and avoids the deficiencies of the two independent systems.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is: a geothermal power generation system combining organic working fluid and steam, including a steam power generation system, the steam power generation system includes an evaporator, a steam turbine, a mixing condenser, and a first reinjection pump connected in sequence; including an organic working fluid power generation system, the organic working fluid power generation system includes an organic working fluid evaporator, an organic working fluid steam turbine, a surface condenser, and an organic working fluid pump connected in sequence. The steam power generation system and the organic working fluid power generation system are connected through a valve. The steam power generation system takes water from a geothermal production well, and the water flowing through the steam power generation system and the organic working fluid power generation system finally returns to the geothermal reinjection well.

[0008] As a preferred embodiment of the present utility model, the evaporator includes a first evaporator outlet, a second evaporator outlet and an evaporator inlet. The first evaporator outlet is connected to a steam turbine, the second evaporator outlet is connected to a valve. The steam is output from the first outlet, and the hot water is output from the second evaporator outlet. The evaporator inlet is connected to a geothermal production well.

[0009] As a preferred embodiment of the present utility model, the steam power generation system includes a second reinjection pump, and the second reinjection pump is connected to a geothermal reinjection well.

[0010] As a preferred embodiment of the present utility model, the valve includes a first valve, a second valve and a third valve. One end of the second evaporator outlet is respectively connected to the inlets of the first valve and the second valve, and the outlet of the first valve is respectively connected to the second reinjection pump and the third valve.

[0011] As a preferred embodiment of the present utility model, the organic working fluid evaporator includes a hot water inlet and a hot water outlet. The hot water flows out from the second evaporator outlet and sequentially passes through the second valve, the hot water inlet and the hot water outlet.

[0012] As a preferred embodiment of the present utility model, the organic working fluid evaporator includes an organic working fluid inlet and an organic working fluid outlet. The organic working fluid sequentially passes through the organic working fluid inlet and the organic working fluid outlet, and the liquid organic working fluid is heated by the hot water in the organic working fluid evaporator to become a gaseous organic working fluid.

[0013] As a preferred embodiment of the present utility model, the hybrid condenser includes a hybrid condenser inlet and a hybrid condenser outlet. The hybrid condenser inlet is connected to a cooling water supply pipeline, and the hybrid condenser outlet is connected to a cooling water return pipeline.

[0014] As a preferred embodiment of the present utility model, the surface condenser includes a surface condenser inlet and a surface condenser outlet. The surface condenser inlet is connected to a cooling water supply pipeline, and the surface condenser outlet is connected to a cooling water return pipeline.

[0015] As a preferred embodiment of the present utility model, a heating system is included. The heating system includes a primary heater, a secondary heater, a molten salt storage tank and a high-temperature molten salt pump connected in sequence. The primary heater is located between the evaporator and the steam turbine, and the secondary heater is located between the organic working fluid evaporator and the organic working fluid steam turbine.

[0016] As a preferred embodiment of the present utility model, the heating system includes a low-temperature molten salt pump and a solar mirror field. The solar mirror field is located at the rear end of the low-temperature molten salt pump, and the low-temperature molten salt is heated by the low-temperature molten salt pump and the solar mirror field and then sent to the molten salt storage tank for storage.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. Compared with the prior art, the present utility model maximizes the utilization of geothermal resources through the cascade utilization of high-temperature geothermal water, improves the power generation per ton of water, and also improves the power generation efficiency and power generation capacity of the system.

[0019] 2. The constant-temperature high-temperature geothermal water in the steam turbine of the present utility model serves as a stable heat source, improving the power generation efficiency of the organic working fluid power generation system.

[0020] 3. By coupling the steam power generation system and the organic working fluid power generation system, the present utility model enables the steam power generation system and the organic working fluid power generation system to cycle and generate electricity simultaneously, reducing the investment in the system and improving the power generation efficiency.

[0021] 4. By controlling the closing and opening of the first valve, the second valve, and the third valve, the present utility model facilitates the maintenance of the internal devices of the steam power generation system and the organic working fluid power generation system and the acquisition of power generation data.

[0022] 5. The high-temperature geothermal water and the organic working fluid of the present utility model can both be recycled, improving the resource utilization rate and being more environmentally friendly.

[0023] 6. By setting up a heating system, the present utility model improves the power generation capacity and power generation efficiency of the steam power generation system and the organic working fluid power generation system.

[0024] 7. By adding a low-temperature molten salt pump and a solar mirror field to the heating system, the present utility model enables the low-temperature molten salt to be heated to high-temperature molten salt more quickly, which is beneficial to the heating of water vapor and organic working fluid by the heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0026] Figure 2 is a schematic structural diagram of Embodiment 2 of the present utility model;

[0027] Reference numerals in the drawings: 1, evaporator; 2, steam turbine; 3, jet condenser; 4, first reinjection pump; 5, second reinjection pump; 6, organic working fluid evaporator; 7, organic working fluid steam turbine; 8, surface condenser; 9, organic working fluid pump; 11, first outlet of the evaporator; 12, second outlet of the evaporator; 13, inlet of the evaporator; 31, inlet of the jet condenser; 32, outlet of the jet condenser; 61, hot water inlet; 62, hot water outlet; 63, outlet of the organic working fluid; 64, inlet of the organic working fluid; 81, inlet of the surface condenser; 82, outlet of the surface condenser; 100, steam power generation system; 200, organic working fluid power generation system; 300, valve; 301, first valve; 302, second valve; 303, third valve; 400, geothermal reinjection well; 500, cooling water supply pipeline; 600, cooling water return pipeline; 700, geothermal production well; 800, power generation system; 801, primary heater; 802, secondary heater; 803, molten salt storage tank; 804, high-temperature molten salt pump; 805, low-temperature molten salt pump; 806, solar mirror field. Detailed implementation mode

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Embodiment 1:

[0030] As Figure 1 shown, a geothermal power generation system combining an organic working fluid and steam includes a steam power generation system 100, and the steam power generation system 100 includes an evaporator 1, a steam turbine 2, a jet condenser 3, and a first reinjection pump 4 connected in sequence; it includes an organic working fluid power generation system 200, and the organic working fluid power generation system 200 includes an organic working fluid evaporator 6, an organic working fluid steam turbine 7, a surface condenser 8, and an organic working fluid pump 9 connected in sequence. The steam power generation system 100 and the organic working fluid power generation system 200 are connected through a valve 300. The steam power generation system 100 takes water from the geothermal production well 700, and the water flowing through the steam power generation system 100 and the organic working fluid power generation system 200 finally returns to the geothermal reinjection well 400.

[0031] Specifically, the high-temperature geothermal water extracted by the geothermal production well 700 enters the steam power generation system 100 and sequentially passes through the evaporator 1, steam turbine 2, mixing condenser 3, and first reinjection pump 4 of the steam power generation system 100. A part of the high-temperature geothermal water becomes water vapor after passing through the evaporator 1, and the other part becomes constant-temperature high-temperature geothermal water. The high-temperature geothermal water that becomes water vapor passes through the steam turbine 2 to convert the steam thermal energy into mechanical energy and drive the steam turbine 2 to do work and generate electricity. The water vapor passing through the steam turbine 2 becomes a liquid-vapor mixture with a lower temperature. The liquid-vapor mixture becomes water with a lower temperature after passing through the mixing condenser 3 and is returned to the geothermal reinjection well 400 through the first reinjection pump 4. The steam power generation system 100 realizes power generation through the circulation of high-temperature geothermal water.

[0032] Furthermore, a part of the high-temperature geothermal water passes through the evaporator 1, and the other part of the constant-temperature high-temperature geothermal water enters the organic Rankine cycle power generation system 200 through the valve 300 and serves as the heating heat source for the organic Rankine cycle evaporator 6 in the organic Rankine cycle power generation system 200. The low-temperature organic working fluid sequentially passes through the organic Rankine cycle evaporator 6, organic Rankine cycle steam turbine 7, surface condenser 8, and organic Rankine cycle pump 9 of the organic Rankine cycle power generation system 200. The low-temperature organic working fluid becomes organic working fluid vapor after passing through the organic Rankine cycle evaporator 6. The organic working fluid vapor enters the organic Rankine cycle steam turbine 7 to convert the organic working fluid vapor thermal energy into mechanical energy and drive the organic Rankine cycle steam turbine 7 to do work and generate electricity. The organic working fluid vapor passing through the organic Rankine cycle steam turbine 7 becomes a liquid-vapor mixture with a lower temperature. The liquid-vapor mixture becomes low-temperature liquid organic working fluid after passing through the surface condenser 8, and then the low-temperature liquid organic working fluid is pumped to the organic Rankine cycle evaporator 6 through the organic Rankine cycle pump 9. The organic Rankine cycle power generation system 200 realizes power generation through the circulation of the organic working fluid, and the constant-temperature high-temperature geothermal water that has been used up in the organic Rankine cycle power generation system 200 can return to the geothermal reinjection well 400 again through the valve 300.

[0033] The utility model maximizes the utilization of geothermal resources through the cascade utilization of high-temperature geothermal water, improves the power generation per ton of water, and also improves the power generation efficiency and power generation capacity of the system.

[0034] The organic working fluid in the organic Rankine cycle power generation system 200 usually has a relatively low boiling point and can evaporate at a relatively low temperature, enabling the organic Rankine cycle power generation system 200 to use the constant-temperature high-temperature geothermal water in the steam turbine 2. The constant-temperature high-temperature geothermal water is a stable heat source, which greatly improves the power generation efficiency of the organic Rankine cycle power generation system 200.

[0035] The temperature of the high-temperature geothermal water extracted by the thermal production well 700 is between 140°C and 180°C. The temperature inside the evaporator 1 is about 140°C. Therefore, the temperature of the high-temperature geothermal water after passing through the evaporator 1 is about 140°C, that is, the temperature of the high-temperature geothermal water entering the organic Rankine cycle power generation system 200 is about 140°C. Similarly, the temperature of the high-temperature geothermal water that has become steam is also about 140°C. The temperature of the vapor-liquid mixture of the high-temperature geothermal water that has become steam is about 40°C after passing through the steam turbine 2.

[0036] The temperature of the low-temperature organic working fluid is about 40°C. It is heated by the organic working fluid evaporator 6 to become organic working fluid vapor at 100°C. The temperature of the organic working fluid vapor becomes about 40°C in the form of a low-temperature gas-liquid mixture after passing through the organic working fluid steam turbine 7.

[0037] The utility model couples the steam power generation system and the organic Rankine cycle power generation system, enabling the steam power generation system and the organic Rankine cycle power generation system to generate electricity simultaneously in a cycle, reducing the investment in the system and improving the power generation efficiency.

[0038] Among them, the evaporator 1 is a pressure-reducing evaporator, which reduces the boiling point of the solution by reducing the internal pressure, thereby realizing the evaporation of the solvent in the solution.

[0039] The main components of the steam turbine 2 include a rotor and a stator. The steam is accelerated through a nozzle and impacts the rotating blades, causing the rotor to rotate. This rotational force is transmitted to the generator or other mechanical equipment through a coupling.

[0040] The reinjection pump is a device used to inject water or other liquids back into the ground, and is commonly used in geothermal energy development, groundwater recharge, water source heat pump systems, and other occasions that require artificial reinjection. Its function is to inject the extracted liquid, such as geothermal water or the water after being used in the water source heat pump system, back into the ground to maintain the groundwater level, protect the sustainable utilization of geothermal resources, or achieve the recycling of water resources.

[0041] The organic working fluid evaporator 6 heats the organic working fluid to a certain temperature and causes it to evaporate, thereby driving the turbine in the cycle to do work.

[0042] The organic working fluid steam turbine 7 uses the expansion of the organic working fluid to drive the turbine, converting thermal energy into mechanical energy, and then converting it into electrical energy through a generator.

[0043] The organic working fluid pump 9 re-transports the condensed liquid working fluid back to the evaporator to complete the cycle.

[0044] The evaporator 1 includes a first outlet 11, a second outlet 12 and an inlet 13 of the evaporator. The first outlet 11 of the evaporator is connected to the steam turbine 2, the second outlet 12 of the evaporator is connected to the valve 300, the steam is output from the first outlet 11 of the evaporator, the hot water is output from the second outlet 12 of the evaporator, and the inlet 13 of the evaporator is connected to the geothermal production well 700.

[0045] Specifically, the high-temperature geothermal water extracted from the geothermal production well 700 enters the evaporator 1 through the inlet 13 of the evaporator. A part of the high-temperature geothermal water becomes water vapor after passing through the evaporator 1, and the other part remains as constant-temperature high-temperature geothermal water. The high-temperature geothermal water that becomes water vapor reaches the steam turbine 2 through the first outlet 11 of the evaporator, and the constant-temperature high-temperature geothermal water enters the valve 300 through the second outlet 12 of the evaporator.

[0046] The steam power generation system 100 includes a second reinjection pump 5, and the second reinjection pump 5 is connected to the geothermal reinjection well 400.

[0047] The valve 300 includes a first valve 301, a second valve 302 and a third valve 303. One end of the second outlet 12 of the evaporator is respectively connected to the inlets of the first valve 301 and the second valve 302, and the outlet of the first valve 301 is respectively connected to the second reinjection pump 5 and the third valve 303.

[0048] Specifically, when the first valve 301 is closed and the second valve 302 and the third valve 303 are opened, the high-temperature geothermal water sequentially passes through the organic working fluid evaporator 6 and the second reinjection pump 5 and enters the geothermal reinjection well 400, providing a stable heat source for the organic working fluid evaporator 6.

[0049] When the first valve 301 is opened and the second valve 302 and the third valve 303 are closed, the high-temperature geothermal water sequentially passes through the second outlet 12 of the evaporator, the first valve 301 and the second reinjection pump 5 and enters the geothermal reinjection well 400, realizing the independent circulating power generation of the steam power generation system 100, which is more convenient for engineers to repair the organic working fluid evaporator 6.

[0050] Furthermore, by only closing the second valve 302 and the third valve 303 and separately providing a stable heat source for the organic working fluid power generation system 200, the independent operation and maintenance of the steam power generation system 100 and the organic working fluid power generation system 200 can be realized, which is convenient for engineers to conduct on-site debugging and obtain data.

[0051] The steam power generation system 100 and the organic working fluid power generation system 200 of the present utility model are coupled through the organic working fluid evaporator 6, realizing the multiple use of the same high-temperature geothermal water, enabling both the steam power generation system 100 and the organic working fluid power generation system 200 to generate electricity in a cycle, and improving the utilization efficiency of the high-temperature geothermal water;

[0052] Furthermore, by controlling the closing and opening of the first valve 301, the second valve 302, and the third valve 303, it is convenient to overhaul the internal devices of the steam power generation system 100 and the organic working fluid power generation system 200 and obtain the power generation data.

[0053] The organic working fluid evaporator 6 includes a hot water inlet 61 and a hot water outlet 62. The hot water flows out from the second outlet 12 of the evaporator and sequentially passes through the second valve 302, the hot water inlet 61, and the hot water outlet 62.

[0054] The organic working fluid evaporator 6 includes an organic working fluid inlet 64 and an organic working fluid outlet 63. The organic working fluid sequentially passes through the organic working fluid inlet 64 and the organic working fluid outlet 63. The liquid organic working fluid is heated by the hot water in the organic working fluid evaporator 6 and becomes a gaseous organic working fluid.

[0055] Specifically, the temperature of the high-temperature geothermal water flowing out from the second outlet 12 of the evaporator is about 140°C. Correspondingly, the temperature of the high-temperature geothermal water entering the organic working fluid evaporator 6 through the hot water inlet 61 is also about 140°C, while the organic working fluid passing through the organic working fluid inlet 64 is about 40°C. The organic working fluid is heated by the high-temperature geothermal water and becomes a gaseous organic working fluid and is discharged through the organic working fluid outlet 63, and the high-temperature geothermal water is also discharged through the hot water outlet 62.

[0056] The mixed condenser 3 includes a mixed condenser inlet 31 and a mixed condenser outlet 32. The mixed condenser inlet 31 is connected to the cooling water supply pipe 500, and the mixed condenser outlet is connected to the cooling water return pipe 600.

[0057] The surface condenser 8 includes a surface condenser inlet 81 and a surface condenser outlet 82. The surface condenser inlet 81 is connected to the cooling water supply pipe 500, and the surface condenser outlet 82 is connected to the cooling water return pipe 600.

[0058] Specifically, the mixed condenser 3 is also called a jet condenser. It mainly sprays the circulating cooling water through a nozzle to form a water film and directly contacts the exhaust steam of the steam turbine for heat exchange. Among them, the steam and the cooling water directly contact and mix. Its structure is simple, the cooling effect is good, and the manufacturing cost is low.

[0059] The surface condenser 8 is a device for heat exchange through a partition wall. The steam or gas to be condensed and the cooling medium are separated by a heat transfer partition wall. In this condenser, the steam condenses on the outer surface of the tube bundle, and the cooling medium flows inside the tube. The two do not directly contact. The surface condenser is used to process steam containing a large amount of non-condensable gas, and the heat transfer surface is easy to clean.

[0060] Generally speaking, the hybrid condenser conducts heat exchange through direct contact, while the surface condenser conducts heat exchange through a partition wall.

[0061] The hybrid condenser 3 turns the vapor-liquid mixture passing through it into geothermal water at a lower temperature, and the surface condenser 8 turns the gaseous organic working fluid into a low-temperature liquid organic working fluid.

[0062] Both the high-temperature geothermal water and the organic working fluid of the present utility model can be recycled, improving the utilization rate of resources and being more environmentally friendly.

[0063] Embodiment Two:

[0064] As Figure 2 shown, the difference between Embodiment Two and Embodiment One is that Embodiment Two further includes a power generation system 800. The power generation system 800 includes a primary heater 801, a secondary heater 802, a molten salt storage tank 803, and a high-temperature molten salt pump 804 connected in sequence. The primary heater 801 is located between the evaporator 1 and the steam turbine 2, and the secondary heater 802 is located between the organic working fluid evaporator 6 and the organic working fluid steam turbine 7.

[0065] Specifically, the high-temperature molten salt pump 804 sends high-temperature molten salt from the molten salt storage tank 803 to the primary heater 801 to heat the water vapor generated from the evaporator 1, increasing the inlet temperature of the steam turbine 2, improving the power generation capacity and power generation efficiency of the steam power generation system 100. Further, the high-temperature molten salt passing through the primary heater 801 has its temperature reduced and enters the secondary heater 802 to heat the organic working fluid evaporated from the organic working fluid evaporator 6, increasing the inlet temperature of the organic working fluid steam turbine 7, improving the power generation efficiency and power generation capacity of the organic working fluid power generation system 200. The high-temperature molten salt with reduced temperature enters the molten salt storage tank 803.

[0066] Among them, the temperature of the high-temperature molten salt coming out of the high-temperature molten salt pump 804 is about 450 °C, the temperature of the high-temperature molten salt passing through the primary heater 801 is about 350 °C, and the temperature of the high-temperature molten salt passing through the secondary heater 802 is about 250 °C.

[0067] In order to enable the high-temperature molten salt to be quickly recycled in the power generation system 800, the power generation system 800 includes a low-temperature molten salt pump 805 and a solar mirror field 806. The solar mirror field 806 is located at the rear end of the low-temperature molten salt pump 805. The low-temperature molten salt is sent to the molten salt storage tank 803 for storage after being heated by the low-temperature molten salt pump 805 and the solar mirror field 806.

[0068] Specifically, the high-temperature molten salt pump 804 sends high-temperature molten salt from the molten salt storage tank 803 to the primary heater 801 to heat the steam generated in the evaporator 1, thereby increasing the inlet temperature of the steam turbine 2, enhancing the power generation capacity and efficiency of the steam power generation system 100. Further, the high-temperature molten salt that has passed through the primary heater 801 decreases in temperature and enters the secondary heater 802 to heat the organic working fluid evaporated from the organic working fluid evaporator 6, increasing the inlet temperature of the organic working fluid turbine 7 and enhancing the power generation efficiency and capacity of the organic working fluid power generation system 200. The high-temperature molten salt with reduced temperature is, on the one hand, pumped by the low-temperature molten salt pump 805 to the solar mirror field 806, and after being further heated in the solar mirror field 806, it is sent to the molten salt storage tank 803 for storage. On the other hand, it directly enters the molten salt storage tank 803.

[0069] By providing the power generation system 800, the present utility model increases the power generation capacity and efficiency of the steam power generation system 100 and the organic working fluid power generation system 200.

[0070] By adding the low-temperature molten salt pump 805 and the solar mirror field 806 to the power generation system 800, the present utility model enables the low-temperature molten salt to be heated to high-temperature molten salt more quickly, which is beneficial for the power generation system 800 to heat the water vapor and the organic working fluid.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0072] Although the following text uses more reference numerals in the drawings: 1, evaporator; 2, steam turbine; 3, jet condenser; 4, first reinjection pump; 5, second reinjection pump; 6, organic working fluid evaporator; 7, organic working fluid steam turbine; 8, surface condenser; 9, organic working fluid pump; 11, first outlet of the evaporator; 12, second outlet of the evaporator; 13, inlet of the evaporator; 31, inlet of the jet condenser; 32, outlet of the jet condenser; 61, hot water inlet; 62, hot water outlet; 63, organic working fluid outlet; 64, organic working fluid inlet; 81, inlet of the surface condenser; 82, outlet of the surface condenser; 100, steam power generation system; 200, organic working fluid power generation system; 300, valve; 301, first valve; 302, second valve; 303, third valve; 400, geothermal reinjection well; 500, cooling water supply pipeline; 600, cooling water return pipeline; 700, geothermal production well; 800, power generation system; 801, primary heater; 802, secondary heater; 803, molten salt storage tank; 804, high-temperature molten salt pump; 805, low-temperature molten salt pump; 806, solar mirror field and other terms, the possibility of using other terms is not excluded; the use of these terms is only for the convenience of describing and explaining the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A geothermal power generation system combining organic working fluid and steam, characterized in that: The invention comprises a steam power generation system (100), wherein the steam power generation system (100) comprises an evaporator (1), a steam turbine (2), a hybrid condenser (3), and a first reinjection pump (4) connected in sequence; and an organic working fluid power generation system (200), wherein the organic working fluid power generation system (200) comprises an organic working fluid evaporator (6), an organic working fluid steam turbine (7), a surface condenser (8), and an organic working fluid pump (9) connected in sequence, wherein the steam power generation system (100) and the organic working fluid power generation system (200) are connected to each other via a valve (300), wherein the steam power generation system (100) draws water from a geothermal extraction well (700), and the water flowing through the steam power generation system (100) and the organic working fluid power generation system (200) eventually returns to the geothermal reinjection well (400).

2. The geothermal power generation system combining organic working fluid and steam according to claim 1, characterized in that: The evaporator (1) comprises a first evaporator outlet (11), a second evaporator outlet (12) and an evaporator inlet (13); the first evaporator outlet (11) is connected to a steam turbine (2); the second evaporator outlet (12) is connected to a valve (300); the first evaporator outlet (11) outputs steam; the second evaporator outlet (12) outputs hot water; and the evaporator inlet (13) is connected to a geothermal extraction well (700).

3. The geothermal power generation system combining organic working fluid and steam according to claim 2 is characterized in that: The steam power generation system (100) comprises a second reinjection pump (5), wherein the second reinjection pump (5) is connected to a geothermal reinjection well (400).

4. The geothermal power generation system combining organic working fluid and steam according to claim 3 is characterized by: The valve (300) comprises a first valve (301), a second valve (302) and a third valve (303); one end of the second outlet (12) of the evaporator is connected to the inlet of the first valve (301) and the inlet of the second valve (302), respectively; and the outlet of the first valve (301) is connected to the second recharging pump (5) and the third valve (303), respectively.

5. The geothermal power generation system combining organic working fluid and steam according to claim 4, characterized in that: The organic working fluid evaporator (6) comprises a hot water inlet (61) and a hot water outlet (62); hot water flows out from the second outlet (12) of the evaporator and passes through the second valve (302), the hot water inlet (61), and the hot water outlet (62) in sequence.

6. The geothermal power generation system combining organic working fluid and steam according to claim 1, characterized in that: The organic working medium evaporator (6) comprises an organic working medium inlet (64) and an organic working medium outlet (63), and the organic working medium passes through the organic working medium inlet (64) and the organic working medium outlet (63) in sequence, and the liquid organic working medium is heated by hot water in the organic working medium evaporator (6) to become a gaseous organic working medium.

7. The geothermal power generation system combining organic working fluid and steam according to claim 1, characterized in that: The hybrid condenser (3) comprises a hybrid condenser inlet (31) and a hybrid condenser outlet (32); the hybrid condenser inlet (31) is connected to a cooling water supply pipeline (500), and the hybrid condenser outlet is connected to a cooling water return pipeline (600).

8. The geothermal power generation system combining organic working fluid and steam according to claim 1, characterized in that: The surface condenser (8) comprises a surface condenser inlet (81) and a surface condenser outlet (82); the surface condenser inlet (81) is connected to a cooling water supply pipe (500), and the surface condenser outlet (82) is connected to a cooling water return pipe (600).

9. The geothermal power generation system combining organic working fluid and steam according to claim 1, characterized in that: The invention comprises a heating system (800), wherein the heating system (800) comprises a primary heater (801), a secondary heater (802), a molten salt storage tank (803) and a high-temperature molten salt pump (804) connected in sequence, wherein the primary heater (801) is located between an evaporator (1) and a steam turbine (2), and the secondary heater (802) is located between an organic working fluid evaporator (6) and an organic working fluid steam turbine (7).

10. The geothermal power generation system combining organic working fluid and steam according to claim 9, characterized in that: The heating system (800) comprises a low-temperature molten salt pump (805) and a solar mirror field (806), wherein the solar mirror field (806) is located at the rear end of the low-temperature molten salt pump (805), and the low-temperature molten salt is heated by the low-temperature molten salt pump (805) and the solar mirror field (806) and then sent to the molten salt storage tank (803) for storage.

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