Geothermal resource development system and method

Abstract

The invention relates to the technical field of development and application of geothermal resources, and particularly discloses a geothermal resource development system and method.The geothermal resource development system comprises an evaporation assembly, an output assembly, a condensation assembly, a storage assembly, a working medium exchange assembly and a pumping assembly; the evaporation assembly comprises a first heat source pipeline, a first evaporator, a three-way valve, a second heat source pipeline and a second evaporator. The output assembly comprises a steam inlet pipeline, a screw expander and a steam exhaust pipeline; the storage assembly comprises a four-way valve, a first working medium box, a second working medium box, a working medium pipeline, a first working medium valve and a second working medium valve; the working medium exchange assembly comprises an upstream pipeline, a control valve and a downstream pipeline. By adjusting the three-way valve and the four-way valve, flexible switching of working modes and flexible selection of organic working media are achieved, so that the system can cope with exploitation of geothermal fluid with different flows and temperatures, geothermal resources with different depths can be efficiently utilized, and the heat efficiency and adaptability of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of development and application of geothermal resources, and in particular to a geothermal resource development system and method. Background Art

[0002] As a clean and renewable energy source, the development and utilization of geothermal resources are of great significance for promoting the optimization of energy structure and environmental protection. However, in the process of geothermal energy development of related technologies, there are still some technical problems that need to be solved urgently:

[0003] The conversion efficiency of traditional geothermal energy is generally low, the energy consumption of geothermal extraction processes is high, and there is a large amount of emissions during the extraction process, which has a significant impact on the environment. Moreover, in the process of geothermal water extraction, due to the differences in geothermal water temperature and flow, how to efficiently utilize geothermal water in these different temperature ranges has become a technical challenge. Summary of the Invention

[0004] The present invention aims to address, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a geothermal resource development system and method. This geothermal resource development system achieves efficient utilization of geothermal resources and stable energy conversion. The system also has advantages such as a compact structure, stable operation, and easy maintenance, and is suitable for the development and utilization of geothermal resources at various depths.

[0005] The second embodiment of the present invention further proposes a geothermal resource development method.

[0006] The geothermal resource development system of the embodiment of the present invention includes an evaporation component, an output component, a condensation component, a storage component, a working fluid exchange component, and a pumping component, wherein:

[0007] The evaporation assembly includes a first heat source pipeline, a first evaporator, a three-way valve, a second heat source pipeline, and a second evaporator, wherein a portion of the first heat source pipeline is located in the first evaporator, the three-way valve is connected in series to the first heat source pipeline, and the three-way valve is close to the outlet of the first heat source pipeline, the inlet and the first outlet of the three-way valve are both in communication with the first heat source pipeline, the inlet of the second heat source pipeline is in communication with the second outlet of the three-way valve, a portion of the second heat source pipeline is located in the second evaporator, and the working medium outlet of the second evaporator is in communication with the working medium inlet of the first evaporator;

[0008] The output assembly includes a steam inlet pipe, a screw expander and an exhaust pipe, wherein the inlet of the steam inlet pipe is connected to the working medium outlet of the first evaporator, the outlet of the steam inlet pipe is connected to the inlet of the screw expander, and the inlet of the exhaust pipe is connected to the outlet of the screw expander;

[0009] The condensing assembly includes a condenser, a circulating water pipe and a circulating water pump, the working medium inlet of the condenser is connected to the outlet of the exhaust pipe, a portion of the circulating water pipe is located inside the condenser, and the circulating water pump is connected in series to the circulating water pipe;

[0010] The storage assembly includes a four-way valve, a first working fluid box, a second working fluid box, a working fluid pipeline, a first working fluid valve, and a second working fluid valve. The inlet of the four-way valve is connected to the working fluid outlet of the condenser, the inlet of the first working fluid box is connected to the first outlet of the four-way valve, the inlet of the second working fluid box is connected to the second outlet of the four-way valve, the inlet of the working fluid pipeline is connected to the outlet of the first working fluid box and the outlet of the second working fluid box, respectively, the outlet of the working fluid pipeline is connected to the inlet of the second evaporator, the first working fluid valve is connected in series between the outlet of the first working fluid box and the inlet of the working fluid pipeline, and the second working fluid valve is connected in series between the outlet of the second working fluid box and the inlet of the working fluid pipeline;

[0011] The working medium exchange component includes an upstream pipeline, a control valve and a downstream pipeline, the outlet of the upstream pipeline is connected to the inlet of the working medium pipeline, the control valve is connected in series to the upstream pipeline, and the inlet of the downstream pipeline is connected to the third outlet of the four-way valve;

[0012] The pumping assembly is connected in series to the working fluid pipeline.

[0013] The geothermal resource development system of the embodiment of the present invention realizes flexible switching of working modes and flexible selection of organic working fluids by adjusting the three-way valve and the four-way valve, so that the system can cope with the exploitation of geothermal fluids with different flow rates and temperatures, thereby enabling efficient utilization of geothermal resources at different depths, thereby improving the thermal efficiency and adaptability of the system.

[0014] In some embodiments, the evaporation component further includes a heat source bypass pipe and a heat source bypass control valve, the inlet of the heat source bypass pipe is connected to the inlet of the first heat source pipe, and the heat source bypass control valve is connected in series to the heat source bypass pipe.

[0015] In some embodiments, the output component also includes a steam inlet bypass pipe and a steam inlet bypass control valve, the inlet of the steam inlet bypass pipe is connected to the inlet of the steam inlet pipe, the outlet of the steam inlet bypass pipe is connected to the outlet of the exhaust pipe, and the steam inlet bypass control valve is connected in series to the steam inlet bypass pipe.

[0016] In some embodiments, the output component further includes a steam inlet main regulating valve and an outlet valve, the steam inlet main regulating valve is connected in series to the steam inlet pipe, and the outlet valve is connected in series to the exhaust pipe.

[0017] In some embodiments, the storage assembly further includes a working fluid control valve, which is connected in series to the working fluid pipeline and is located between the pumping assembly and the second evaporator.

[0018] In some embodiments, the condensation component also includes a condensation bypass pipe and a condensation bypass control valve, the condenser also has a second outlet, the inlet of the condensation bypass pipe is connected to the second outlet of the condenser, the outlet of the condensation bypass pipe is connected to the working fluid pipe, and the outlet of the condensation bypass pipe is located between the working fluid regulating valve and the pumping component.

[0019] In some embodiments, the pumping assembly includes a first working fluid pump and a second working fluid pump, the first working fluid pump and the second working fluid pump are both connected in series to the working fluid pipeline, and the first working fluid pump and the second working fluid pump are connected in parallel to each other.

[0020] The geothermal resource development method according to the second embodiment of the present invention includes:

[0021] S1. Provide a geothermal resource development system as described in any of the above embodiments, divide the area to be mined into multiple mining zones, and connect the inlet of the first heat source pipeline to the outlet of the mining geothermal fluid pipeline;

[0022] S2, connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping;

[0023] S3, mining the first partition, monitoring whether the temperature of the fluid entering the first heat source pipeline is less than the set temperature and remains stable, if so, proceeding to step S4, if not, proceeding to step S5;

[0024] S4, blowing the first working medium vapor into the working medium pipeline through the upstream pipeline until a stable and continuous flow of the first working medium vapor is generated at the outlet of the downstream pipeline, then stopping, closing the control valve, connecting the inlet of the four-way valve with the first outlet of the four-way valve, opening the first working medium valve, starting the pumping assembly, the first evaporator, the screw expander, the circulating water pump, and the condenser, and then proceeding to step S6;

[0025] S5, blowing the second working medium vapor into the working medium pipeline through the upstream pipeline until a stable and continuous flow of the second working medium vapor is generated at the outlet of the downstream pipeline, then stopping, closing the control valve, connecting the inlet of the four-way valve with the second outlet of the four-way valve, opening the second working medium valve, starting the pumping assembly, the first evaporator, the screw expander, the circulating water pump, and the condenser, and then proceeding to step S6;

[0026] S6. Monitor the flow rate of the fluid in the first heat source pipeline and determine whether the flow rate of the fluid in the first heat source pipeline is less than a set value. If so, connect the inlet of the three-way valve to the first outlet of the three-way valve; if not, connect the inlet of the three-way valve to the second outlet of the three-way valve and open the second evaporator;

[0027] S7. After the mining of the previous zone is completed, the mining operation of the next zone is carried out, and the temperature change of the fluid entering the first heat source pipeline is monitored to determine whether the temperature of the fluid entering the first heat source pipeline is on opposite sides of the set temperature relative to the temperature of the fluid entering the first heat source pipeline when the previous zone was mined. If not, the mining operation is continued. If so, the organic working medium in the pipeline in the system is first switched before continuing the mining operation.

[0028] S8. Repeat steps S6 and S7 until all partitions are mined.

[0029] The geothermal resource development method of an embodiment of the present invention uses the above-mentioned geothermal resource development system and realizes flexible switching of working modes and flexible selection of organic working fluids by adjusting the three-way valve and the four-way valve, so that the system can cope with the exploitation of geothermal fluids with different flow rates and temperatures, thereby enabling efficient utilization of geothermal resources at different depths, thereby improving the thermal efficiency and adaptability of the system.

[0030] In some embodiments, when the organic working medium in the system pipeline is switched,

[0031] The steps of switching from the first working medium to the second working medium include:

[0032] shutting down the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser;

[0033] Connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping;

[0034] Blowing the second working medium steam into the working medium pipeline through the upstream pipeline until a stable and continuous second working medium steam flow is generated at the outlet of the downstream pipeline and then stopping;

[0035] Close the control valve, connect the inlet of the four-way valve to the second outlet of the four-way valve, and open the second working fluid valve;

[0036] Turning on the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser;

[0037] The steps of switching from the second working medium to the first working medium include:

[0038] shutting down the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser;

[0039] Connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping;

[0040] Blowing the first working medium steam into the working medium pipeline through the upstream pipeline until a stable and continuous first working medium steam flow is generated at the outlet of the downstream pipeline and then stopping;

[0041] Close the control valve, connect the inlet of the four-way valve to the first outlet of the four-way valve, and open the first working fluid valve;

[0042] The pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser are turned on.

[0043] In some embodiments, the first working fluid is isopentane R601a; and / or,

[0044] The second working fluid is pentafluoropropane R245fa; and / or,

[0045] The set temperature is 85°C-95°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of a geothermal resource development system according to an embodiment of the present invention.

[0047] Reference numerals:

[0048] Evaporation assembly 1, first heat source pipeline 11, first evaporator 12, three-way valve 13, second heat source pipeline 14, second evaporator 15, heat source bypass pipeline 16, heat source bypass control valve 17,

[0049] Output assembly 2, steam inlet pipe 21, screw expander 22, exhaust pipe 23, steam inlet bypass pipe 24, steam inlet bypass control valve 25, steam inlet main regulating valve 26, outlet valve 27,

[0050] Condensation assembly 3, condenser 31, circulating water pipe 32, circulating water pump 33, condensation bypass pipe 34, condensation bypass control valve 35,

[0051] Storage component 4, four-way valve 41, first working fluid box 42, second working fluid box 43, working fluid pipeline 44, first working fluid valve 45, second working fluid valve 46, working fluid control valve 47,

[0052] Working medium component 5, upstream pipeline 51, control valve 52, downstream pipeline 53,

[0053] Pumping assembly 6 , first working fluid pump 61 , second working fluid pump 62 . DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0055] The following describes a geothermal resource development system according to an embodiment of the present invention with reference to the accompanying drawings. The up, down, left, and right directions in the accompanying drawings are only used to more clearly describe the features of the components of the present invention and are not intended to be the actual placement of the components in use.

[0056] like Figure 1 As shown, the geothermal resource development system of the embodiment of the present invention includes an evaporation component 1, an output component 2, a condensation component 3, a storage component 4, a working fluid exchange component 5 and a pumping component 6, wherein:

[0057] The evaporation assembly 1 includes a first heat source pipeline 11, a first evaporator 12, a three-way valve 13, a second heat source pipeline 14, and a second evaporator 15. A portion of the first heat source pipeline 11 is located in the first evaporator 12 and is used to introduce geothermal fluid (such as hot water or steam) into the first evaporator 12. The geothermal fluid exchanges heat with the organic working medium in the first evaporator 12, causing the organic working medium to evaporate into working medium steam; the three-way valve 13 is connected in series to the first heat source pipeline 11. The three-way valve 13 is located outside the first evaporator 12 and is close to the outlet of the first heat source pipeline 11. The three-way valve 13 has one inlet and two outlets. The inlet of the three-way valve 13 (such as Figure 1 The opening on the right side as shown) and the first outlet (as shown Figure 1 The opening on the left side is connected to the first heat source pipe 11, and the inlet of the second heat source pipe 14 is connected to the second outlet of the three-way valve 13 (as shown in FIG. Figure 1The first evaporator 12 is connected to the first heat source pipe 11, and a portion of the second heat source pipe 14 is located in the second evaporator 15. When the flow rate of the geothermal fluid is small, the first evaporator 12 can fully absorb and utilize the heat of the geothermal fluid. By adjusting the three-way valve 13, the inlet of the three-way valve 13 and the first outlet of the three-way valve 13 are connected. The geothermal fluid in the first heat source pipe 11 passes through the first evaporator 12 and is discharged through the outlet of the first heat source pipe 11. The system simplifies operation and reduces energy consumption. When the flow rate of the geothermal fluid is large, the inlet of the three-way valve 13 is connected to the first outlet of the three-way valve 13. The inlet is connected to the second outlet of the three-way valve 13. The geothermal fluid in the first heat source pipeline 11 passes through the first evaporator 12 and then enters the second evaporator 15 through the second heat source pipeline 14. The geothermal fluid in the second evaporator 15 uses waste heat to preheat the organic working fluid in the second evaporator 15 to improve the heat utilization efficiency; the working fluid outlet of the second evaporator 15 is connected to the working fluid inlet of the first evaporator 12, forming a series evaporation process. This design can improve the evaporation efficiency of the organic working fluid and fully utilize the thermal energy of the geothermal fluid.

[0058] The output component 2 includes a steam inlet pipe 21, a screw expander 22 and an exhaust pipe 23. The inlet of the steam inlet pipe 21 is connected to the working fluid outlet of the first evaporator 12, and the outlet of the steam inlet pipe 21 is connected to the inlet of the screw expander 22. The steam inlet pipe 21 is used to introduce the evaporated organic working fluid steam into the screw expander 22; the screw expander can convert high-temperature and high-pressure steam energy into mechanical energy to drive a generator to generate electricity or drive other mechanical equipment; the inlet of the exhaust pipe 23 is connected to the outlet of the screw expander 22, and is used to discharge the expanded low-temperature and low-pressure steam out of the screw expander 22.

[0059] The condensation component 3 includes a condenser 31, a circulating water pipe 32 and a circulating water pump 33. The working fluid inlet of the condenser 31 is connected to the outlet of the exhaust pipe 23, and is used to receive the expanded low-temperature and low-pressure steam. A part of the circulating water pipe 32 is located in the condenser 31. The steam is condensed into a liquid organic working fluid through heat exchange between the circulating water and the steam. The circulating water pump 33 is connected in series to the circulating water pipe 32 and is responsible for driving the circulating water to circulate in the condenser 31 to improve the condensation efficiency.

[0060] The storage assembly 4 includes a four-way valve 41, a first working fluid box 42, a second working fluid box 43, a working fluid pipeline 44, a first working fluid valve 45 and a second working fluid valve 46. The four-way valve 41 has one inlet and three outlets. The inlet of the four-way valve 41 (such as Figure 1 The opening on the upper side is connected to the working medium outlet of the condenser 31, and the organic working medium passing through the condenser 31 enters the four-way valve 41 through the inlet of the four-way valve 41; the inlet of the first working medium box 42 is connected to the first outlet of the four-way valve 41 (as shown in FIG. Figure 1The inlet of the second working medium box 43 is connected to the second outlet of the four-way valve 41 (as shown in FIG. Figure 1 The first working fluid box 42 and the second working fluid box 43 are respectively used to store different liquid organic working fluids to cope with geothermal fluids at different temperatures; the inlet of the working fluid pipeline 44 is respectively connected to the outlet of the first working fluid box 42 and the outlet of the second working fluid box 43, the outlet of the working fluid pipeline 44 is connected to the inlet of the second evaporator 15, the first working fluid valve 45 is connected in series between the outlet of the first working fluid box 42 and the inlet of the working fluid pipeline 44, and the second working fluid valve 46 is connected in series between the outlet of the second working fluid box 43 and the inlet of the working fluid pipeline 44.

[0061] The fluid exchange component 5 includes an upstream pipeline 51, a control valve 52 and a downstream pipeline 53. The outlet of the upstream pipeline 51 is connected to the inlet of the fluid pipeline 44. The upstream pipeline 51 is used to introduce new organic fluid or dry gas into the system pipeline. The control valve 52 is connected in series with the upstream pipeline 51 to control the on-off between the upstream pipeline 51 and the fluid pipeline 44. The inlet of the downstream pipeline 53 is connected to the third outlet of the four-way valve 41 (such as Figure 1 The opening shown on the right is connected to the system pipeline for discharging organic working fluid and / or dry gas.

[0062] The pumping assembly 6 is connected in series to the working fluid pipeline 44 . The pumping assembly 6 is mainly responsible for providing necessary power support for the system to ensure that the organic working fluid flows smoothly in the system.

[0063] When the present invention is used, the four-way valve 41 is controlled so that the inlet of the four-way valve 41 is connected to the third outlet, and the control valve 52 is opened to blow dry gas into the working fluid pipeline 44 through the upstream pipeline 51 until stable and continuous dry gas is generated at the outlet of the downstream pipeline 53 to discharge unnecessary organic working fluid vapor and / or organic working fluid liquid in the system pipeline; the temperature and flow of the fluid in the first heat source pipeline 11 are continuously monitored, and a suitable organic working fluid is selected according to the temperature of the fluid (for example, when the temperature is less than 90°C, the first working fluid is used as the heat exchange working fluid, and when the temperature reaches 90°C or above, the second working fluid is used as the heat exchange working fluid), and whether to open the second evaporator 15 is selected according to the flow rate of the fluid.

[0064] The geothermal resource development system of the embodiment of the present invention realizes flexible switching of working modes and flexible selection of organic working fluids by adjusting the three-way valve 13 and the four-way valve 41, so that the system can cope with the exploitation of geothermal fluids with different flow rates and temperatures, thereby making efficient use of geothermal resources at different depths, thereby improving the thermal efficiency and adaptability of the system.

[0065] like Figure 1As shown, in some embodiments, the evaporation component 1 further includes a heat source bypass pipe 16 and a heat source bypass control valve 17. The inlet of the heat source bypass pipe 16 is connected to the inlet of the first heat source pipe 11. The heat source bypass control valve 17 is connected in series to the heat source bypass pipe 16. By controlling the opening of the valve 52, the flow rate of the geothermal fluid passing through the heat source bypass pipe 16 can be adjusted.

[0066] When the system needs to reduce the flow of geothermal fluid entering the first evaporator 12, the heat source bypass control valve 17 can be opened, allowing some geothermal fluid to bypass the first evaporator 12 through the bypass pipeline and directly enter subsequent processes or flow back to the geothermal well. Conversely, when the flow of geothermal fluid entering the first evaporator 12 needs to be increased, the opening of the heat source bypass control valve 17 can be closed or reduced, allowing more geothermal fluid to enter the first evaporator 12 for heat exchange. This design not only increases the system's flexibility in regulating the geothermal fluid flow but also helps optimize the system's thermal efficiency.

[0067] Therefore, the geothermal resource development system of the embodiment of the present invention improves the system's ability to regulate geothermal fluid flow through the provision of the heat source bypass pipe 16 and the heat source bypass control valve 17 to adapt to the requirements of different geothermal resource conditions and operating conditions.

[0068] like Figure 1 As shown, in some embodiments, the output component 2 further includes a steam inlet bypass pipe 24 and a steam inlet bypass control valve 25. The inlet of the steam inlet bypass pipe 24 is connected to the inlet of the steam inlet pipe 21, and the outlet of the steam inlet bypass pipe 24 is connected to the outlet of the exhaust pipe 23, forming a steam channel in parallel with the screw expander 22. The steam inlet bypass control valve 25 is connected in series to the steam inlet bypass pipe 24. By controlling the opening of the valve 52, the steam flow through the steam inlet bypass pipe 24 can be adjusted.

[0069] When the system needs to reduce the steam flow entering the screw expander 22, the steam inlet bypass control valve 25 can be opened to allow some steam to bypass the screw expander 22 through the bypass pipe. Conversely, when the steam flow entering the screw expander 22 needs to be increased, the opening of the steam inlet bypass control valve 25 can be closed or reduced to allow more steam to enter the screw expander 22 for expansion and work. This design not only improves the system's flexibility in regulating the steam flow entering the screw expander 22, but also helps protect the screw expander 22 from the impact and damage caused by excessive steam flow. At the same time, by reasonably adjusting the opening of the steam inlet bypass control valve 25, the operating efficiency of the screw expander 22 can also be optimized, thereby improving the overall performance of the system.

[0070] Therefore, the geothermal resource development system of the embodiment of the present invention improves the system's ability to regulate the inlet steam flow of the screw expander 22 through the provision of the steam inlet bypass pipe 24 and the steam inlet bypass control valve 25, ensuring that the screw expander 22 can operate stably under different working conditions.

[0071] like Figure 1 As shown, in some embodiments, the output component 2 also includes a steam inlet main regulating valve 26 and an outlet valve 27. The steam inlet main regulating valve 26 is connected in series to the steam inlet pipe 21. By adjusting the opening of the steam inlet main regulating valve 26, the steam flow entering the screw expander 22 can be accurately controlled to ensure that the screw expander 22 can obtain a stable steam supply under different operating conditions. The outlet valve 27 is connected in series to the exhaust pipe 23. By adjusting the opening of the outlet valve 27, the steam discharge speed and flow of the exhaust pipe 23 can be controlled. When the system needs to discharge steam quickly to reduce the pressure, the outlet valve 27 can be opened. When the system pressure needs to be kept stable, the opening of the outlet valve 27 can be appropriately reduced. In addition, the outlet valve 27 can also be quickly closed in an emergency to cut off the steam discharge channel and protect the safety of the system.

[0072] Therefore, the geothermal resource development system of the embodiment of the present invention achieves precise control of steam flow and effective regulation of system pressure by adding the steam inlet main regulating valve 26 and the outlet valve 27, which not only improves the operating efficiency and stability of the system, but also enhances the safety and reliability of the system.

[0073] like Figure 1 As shown, in some embodiments, the storage component 4 also includes a working fluid control valve 47, which is connected in series to the working fluid pipeline 44, and the working fluid control valve 47 is located between the pumping component 6 and the second evaporator 15. By adjusting the opening of the working fluid control valve 47, the flow of the liquid organic working fluid from the storage component 4 (the first working fluid box 42 and the second working fluid box 43) to the second evaporator 15 can be flexibly controlled. In addition, the working fluid control valve 47 can also quickly cut off the flow of the liquid organic working fluid during system startup, shutdown or failure to protect the system safety.

[0074] like Figure 1 As shown, in some embodiments, the condensation component 3 also includes a condensation bypass pipe 34 and a condensation bypass control valve 35. In addition to the original working fluid inlet and the outlet connected to the working fluid pipe 44, the condenser 31 is also provided with a second outlet. The inlet of the condensation bypass pipe 34 is connected to the second outlet of the condenser 31, and the outlet of the condensation bypass pipe 34 is connected to the working fluid pipe 44. The outlet of the condensation bypass pipe 34 is located between the working fluid regulating valve and the pumping component 6. The condensation bypass control valve 35 is connected in series to the condensation bypass pipe 34. By adjusting its opening, the flow of liquid organic working fluid through the condensation bypass pipe 34 can be controlled.

[0075] This design allows the system to flexibly select the condensation path under different operating conditions. For example, at the initial stage of system startup or when the load is low, the condensation bypass control valve 35 can be opened appropriately to allow part of the liquid organic working fluid to flow directly back to the evaporator through the bypass pipe, reducing the system load and improving the system response speed; while under normal system operation or high-load conditions, the opening of the condensation bypass control valve 35 can be closed or reduced to allow more liquid organic working fluid to be fully condensed through the condenser 31 and mixed with the cooled organic working fluid in the working fluid box, ensuring system efficiency and stability.

[0076] like Figure 1 As shown, in some embodiments, the pumping assembly 6 includes a first working fluid pump 61 and a second working fluid pump 62, both of which are connected in series to the working fluid pipeline 44, and the first working fluid pump 61 and the second working fluid pump 62 are connected in parallel. The two working fluid pumps can work together to share the task of transporting the liquid organic working fluid, thereby improving the total flow rate and efficiency of the system. At the same time, because the two pumps are connected in parallel, their operations do not affect each other. Even if one pump fails or requires maintenance, the other pump can still operate independently, ensuring the continuity and stability of the system.

[0077] The geothermal resource development method according to the second embodiment of the present invention includes:

[0078] S1. Provide a geothermal resource development system as in any of the above embodiments, divide the area to be mined into multiple mining zones according to the depth of the resources, the distribution of the resources or the mining needs, connect the inlet of the first heat source pipeline 11 with the outlet of the mining geothermal fluid pipeline, and ensure that the geothermal fluid can smoothly enter the first heat source pipeline 11 for subsequent processing.

[0079] S2. Connect the inlet of the four-way valve 41 to the third outlet of the four-way valve 41, open the control valve 52, and blow dry gas into the working medium pipeline 44 through the upstream pipeline 51 until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline 53, then stop, to ensure that there are no residual impurities in the system pipeline.

[0080] S3, mining the first partition, monitoring whether the temperature of the fluid entering the first heat source pipeline 11 is less than the set temperature and remains stable, if so, proceeding to step S4, if not, proceeding to step S5;

[0081] S4, blowing the first working medium steam into the working medium pipeline 44 through the upstream pipeline 51 until a stable and continuous first working medium steam flow is generated at the outlet of the downstream pipeline 53, then stopping, ensuring that the system pipeline is filled with the first working medium steam and no residual impurities; closing the control valve 52, connecting the inlet of the four-way valve 41 with the first outlet of the four-way valve 41, opening the first working medium valve 45, starting the pumping assembly 6, the first evaporator 12, the screw expander 22, the circulating water pump 33 and the condenser 31, and then entering step S6;

[0082] S5, blowing the second working medium steam into the working medium pipeline 44 through the upstream pipeline 51 until a stable and continuous second working medium steam flow is generated at the outlet of the downstream pipeline 53, then stopping, ensuring that the system pipeline is filled with the second working medium steam and no residual impurities; closing the control valve 52, connecting the inlet of the four-way valve 41 with the second outlet of the four-way valve 41, opening the second working medium valve 46, starting the pumping assembly 6, the first evaporator 12, the screw expander 22, the circulating water pump 33 and the condenser 31, and then entering step S6;

[0083] S6, monitoring the flow of the fluid in the first heat source pipeline 11, and determining whether the flow of the fluid in the first heat source pipeline 11 is less than a set value, if yes, connecting the inlet of the three-way valve 13 with the first outlet of the three-way valve 13, if no, connecting the inlet of the three-way valve 13 with the second outlet of the three-way valve 13, and opening the second evaporator 15 to improve the thermal efficiency of the system.

[0084] S7, after the last subzone is mined, the next subzone is mined, and the temperature change of the fluid entering the first heat source pipeline 11 is monitored to determine whether the temperature of the fluid entering the first heat source pipeline 11 is on the opposite side of the set temperature relative to the temperature of the fluid entering the first heat source pipeline 11 when the last subzone is mined, if not, continue the mining operation, if yes, switch the organic working medium in the pipeline of the system first and then continue the mining operation;

[0085] S8, repeating steps S6 and S7 until all subzones are mined.

[0086] The geothermal resource development method of the embodiment of the present application uses the above-mentioned geothermal resource development system, adjusts the three-way valve 13 and the four-way valve 41, realizes flexible switching of the working mode and flexible selection of the organic working medium, makes the system capable of coping with the mining of geothermal fluids with different flow rates and temperatures, and thus the geothermal resources at different depths can be efficiently utilized, and the thermal efficiency and adaptability of the system are improved.

[0087] In some embodiments, when the organic working medium in the system pipeline is switched:

[0088] The step of switching from the first working medium to the second working medium includes:

[0089] Turn off the pumping assembly 6, the first evaporator 12, the second evaporator 15, the screw expander 22, the circulating water pump 33 and the condenser 31 to ensure that the system is in a shutdown state;

[0090] Connect the inlet of the four-way valve 41 to the third outlet of the four-way valve 41, open the control valve 52, and blow dry gas into the working medium pipeline 44 through the upstream pipeline 51 until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline 53, then stop, to ensure that there are no residual impurities in the system pipeline;

[0091] Blow the second working medium steam into the working medium pipe 44 through the upstream pipe 51 until a stable and continuous second working medium steam flow is generated at the outlet of the downstream pipe 53, and then stop, to ensure that the system pipe is full of the second working medium steam and there is no residual impurity;

[0092] Close the control valve 52, connect the inlet of the four-way valve 41 to the second outlet of the four-way valve 41, and open the second working medium valve 46 to ensure that the second working medium in the condenser 31 can flow smoothly into the second working medium tank 43, and ensure that the second working medium in the second working medium tank 43 can flow smoothly into the working medium pipeline 44;

[0093] The pumping assembly 6, the first evaporator 12, the second evaporator 15, the screw expander 22, the circulating water pump 33 and the condenser 31 are turned on, and the operating parameters of the system, such as the working fluid flow, pressure, temperature, etc., are adjusted according to the new working fluid characteristics and mining requirements.

[0094] The steps of switching from the second working medium to the first working medium include:

[0095] Turn off the pumping assembly 6, the first evaporator 12, the second evaporator 15, the screw expander 22, the circulating water pump 33 and the condenser 31 to ensure that the system is in a shutdown state;

[0096] Connect the inlet of the four-way valve 41 to the third outlet of the four-way valve 41, open the control valve 52, and blow dry gas into the working medium pipeline 44 through the upstream pipeline 51 until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline 53, then stop, to ensure that there are no residual impurities in the system pipeline;

[0097] Blow the first working medium steam into the working medium pipe 44 through the upstream pipe 51 until a stable and continuous first working medium steam flow is generated at the outlet of the downstream pipe 53, and then stop, to ensure that the system pipe is full of the first working medium steam and there is no residual impurity;

[0098] Close the control valve 52, connect the inlet of the four-way valve 41 to the first outlet of the four-way valve 41, and open the first working medium valve 45 to ensure that the first working medium in the condenser 31 can flow smoothly into the first working medium tank 42, and ensure that the first working medium in the first working medium tank 42 can flow smoothly into the working medium pipeline 44;

[0099] Turn on the pumping assembly 6, the first evaporator 12, the second evaporator 15, the screw expander 22, the circulating water pump 33 and the condenser 31, and adjust the system operating parameters such as the working fluid flow, pressure, temperature, etc. according to the new working fluid characteristics and mining requirements.

[0100] In some embodiments, the first working fluid is isopentane R601a; and / or,

[0101] The second working fluid is pentafluoropropane R245fa; and / or,

[0102] The set temperature is 85℃-95℃, for example 85℃, 88℃, 90℃, 92℃, 95℃.

[0103] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0105] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0106] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0108] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A geothermal resource development system, characterized in that: include: an evaporation assembly, the evaporation assembly comprising a first heat source pipeline, a first evaporator, a three-way valve, a second heat source pipeline, and a second evaporator, wherein a portion of the first heat source pipeline is located within the first evaporator, the three-way valve is connected in series to the first heat source pipeline, and the three-way valve is close to the outlet of the first heat source pipeline, the inlet and the first outlet of the three-way valve are both in communication with the first heat source pipeline, the inlet of the second heat source pipeline is in communication with the second outlet of the three-way valve, a portion of the second heat source pipeline is located within the second evaporator, and the working fluid outlet of the second evaporator is in communication with the working fluid inlet of the first evaporator; an output assembly, the output assembly comprising a steam inlet pipe, a screw expander, and an exhaust pipe, the inlet of the steam inlet pipe being connected to the working medium outlet of the first evaporator, the outlet of the steam inlet pipe being connected to the inlet of the screw expander, and the inlet of the exhaust pipe being connected to the outlet of the screw expander; A condensing assembly, comprising a condenser, a circulating water pipe and a circulating water pump, wherein the working medium inlet of the condenser is connected to the outlet of the exhaust pipe, a portion of the circulating water pipe is located inside the condenser, and the circulating water pump is connected in series to the circulating water pipe; A storage assembly, the storage assembly comprising a four-way valve, a first working fluid box, a second working fluid box, a working fluid pipeline, a first working fluid valve, and a second working fluid valve. The inlet of the four-way valve is connected to the working fluid outlet of the condenser, the inlet of the first working fluid box is connected to the first outlet of the four-way valve, the first working fluid box is used to store a first working fluid, the inlet of the second working fluid box is connected to the second outlet of the four-way valve, the second working fluid box is used to store a second working fluid, the inlet of the working fluid pipeline is connected to the outlet of the first working fluid box and the outlet of the second working fluid box respectively, the outlet of the working fluid pipeline is connected to the inlet of the second evaporator, the first working fluid valve is connected in series between the outlet of the first working fluid box and the inlet of the working fluid pipeline, and the second working fluid valve is connected in series between the outlet of the second working fluid box and the inlet of the working fluid pipeline; a working medium exchange component, the working medium exchange component comprising an upstream pipeline, a control valve and a downstream pipeline, the outlet of the upstream pipeline being connected to the inlet of the working medium pipeline, the control valve being connected in series to the upstream pipeline, and the inlet of the downstream pipeline being connected to the third outlet of the four-way valve; A pumping assembly is connected in series to the working fluid pipeline.

2. The geothermal resource development system according to claim 1, characterized in that: The evaporation component further includes a heat source bypass pipe and a heat source bypass control valve. The inlet of the heat source bypass pipe is communicated with the inlet of the first heat source pipe. The heat source bypass control valve is serially connected to the heat source bypass pipe.

3. The geothermal resource development system according to claim 1, characterized in that: The output component also includes a steam inlet bypass pipe and a steam inlet bypass control valve. The inlet of the steam inlet bypass pipe is connected to the inlet of the steam inlet pipe, the outlet of the steam inlet bypass pipe is connected to the outlet of the exhaust pipe, and the steam inlet bypass control valve is connected in series to the steam inlet bypass pipe.

4. The geothermal resource development system according to claim 1 or 3, characterized in that: The output assembly further includes a steam inlet main regulating valve and an outlet valve. The steam inlet main regulating valve is connected in series to the steam inlet pipeline, and the outlet valve is connected in series to the exhaust pipeline.

5. The geothermal resource development system according to claim 1, characterized in that: The storage component further includes a working fluid control valve, which is connected in series to the working fluid pipeline and is located between the pumping component and the second evaporator.

6. The geothermal resource development system according to claim 5, characterized in that: The condensing component also includes a condensing bypass pipe and a condensing bypass control valve. The condenser also has a second outlet. The inlet of the condensing bypass pipe is connected to the second outlet of the condenser. The outlet of the condensing bypass pipe is connected to the working fluid pipe, and the outlet of the condensing bypass pipe is located between the working fluid regulating valve and the pumping component. The condensing bypass control valve is connected in series to the condensing bypass pipe.

7. The geothermal resource development system according to claim 1, characterized in that: The pumping assembly includes a first working fluid pump and a second working fluid pump. The first working fluid pump and the second working fluid pump are both connected in series to the working fluid pipeline, and the first working fluid pump and the second working fluid pump are connected in parallel to each other.

8. A method for developing geothermal resources, characterized in that: Using the geothermal resource development system according to any one of claims 1 to 7, the geothermal resource development method includes: S1. Divide the area to be mined into multiple mining zones, and connect the inlet of the first heat source pipeline to the outlet of the mining geothermal fluid pipeline; S2, connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping; S3, mining the first partition, monitoring whether the temperature of the fluid entering the first heat source pipeline is less than the set temperature and remains stable, if so, proceeding to step S4, if not, proceeding to step S5; S4, blowing the first working medium vapor into the working medium pipeline through the upstream pipeline until a stable and continuous flow of the first working medium vapor is generated at the outlet of the downstream pipeline, then stopping, closing the control valve, connecting the inlet of the four-way valve with the first outlet of the four-way valve, opening the first working medium valve, starting the pumping assembly, the first evaporator, the screw expander, the circulating water pump, and the condenser, and then proceeding to step S6; S5, blowing the second working medium vapor into the working medium pipeline through the upstream pipeline until a stable and continuous flow of the second working medium vapor is generated at the outlet of the downstream pipeline, then stopping, closing the control valve, connecting the inlet of the four-way valve with the second outlet of the four-way valve, opening the second working medium valve, starting the pumping assembly, the first evaporator, the screw expander, the circulating water pump, and the condenser, and then proceeding to step S6; S6. Monitor the flow rate of the fluid in the first heat source pipeline and determine whether the flow rate of the fluid in the first heat source pipeline is less than a set value. If so, connect the inlet of the three-way valve to the first outlet of the three-way valve; if not, connect the inlet of the three-way valve to the second outlet of the three-way valve and open the second evaporator; S7. After the mining of the previous zone is completed, the mining operation of the next zone is carried out, and the temperature change of the fluid entering the first heat source pipeline is monitored to determine whether the temperature of the fluid entering the first heat source pipeline is on opposite sides of the set temperature relative to the temperature of the fluid entering the first heat source pipeline when the previous zone was mined. If not, the mining operation is continued. If so, the organic working medium in the pipeline in the system is first switched before continuing the mining operation. S8. Repeat steps S6 and S7 until all partitions are mined.

9. The geothermal resource development method according to claim 8, characterized in that: When switching the organic working fluid in the system pipeline, The steps of switching from the first working medium to the second working medium include: shutting down the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser; Connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping; Blowing the second working medium steam into the working medium pipeline through the upstream pipeline until a stable and continuous second working medium steam flow is generated at the outlet of the downstream pipeline and then stopping; Close the control valve, connect the inlet of the four-way valve to the second outlet of the four-way valve, and open the second working fluid valve; Turning on the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser; The steps of switching from the second working medium to the first working medium include: shutting down the pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser; Connecting the inlet of the four-way valve to the third outlet of the four-way valve, opening the control valve, and blowing dry gas into the working medium pipeline through the upstream pipeline until a stable and continuous dry gas flow is generated at the outlet of the downstream pipeline and then stopping; Blowing the first working medium steam into the working medium pipeline through the upstream pipeline until a stable and continuous first working medium steam flow is generated at the outlet of the downstream pipeline and then stopping; Close the control valve, connect the inlet of the four-way valve to the first outlet of the four-way valve, and open the first working fluid valve; The pumping assembly, the first evaporator, the second evaporator, the screw expander, the circulating water pump, and the condenser are turned on.

10. The geothermal resource development method according to claim 8, characterized in that: The first working fluid is isopentane R601a; and / or, The second working fluid is pentafluoropropane R245fa; and / or, The set temperature is 85°C-95°C.

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