Immersive hot spring ORC power generation system

Abstract

The present application relates to a kind of immersion hot spring ORC power generation systems, including low-grade organic rankine cycle device, geothermal hot spring heat storage system and detection and control assembly, the low-grade organic rankine cycle device immersion evaporator is immersed in the heat exchange pool of geothermal hot spring heat storage system and carries out heat exchange, the detection and control assembly is coupled in geothermal hot spring heat storage system, to control the whole immersion hot spring ORC power generation system work according to the liquid level, temperature information detected.This system can efficiently, continuously provide power and suitable temperature hot spring water for hot spring hotel.

Description

Technical Field

[0001] This invention relates to the field of geothermal power generation technology, specifically to an immersive hot spring ORC power generation system. Background Technology

[0002] Traditional hot spring hotels extract hot spring water at 80℃-100℃ from geothermal wells. The temperature is too high for hot spring bathing. In order to maintain the quality of the "original hot spring water", most hot spring hotels first pump the hot spring water into a reservoir and wait for the water temperature in the reservoir to cool naturally to a temperature suitable for guests to bathe in (40℃-50℃) before making it available to guests. This wastes the heat energy of the hot spring water at the high temperature and increases the waiting time, affecting the customer experience. Summary of the Invention

[0003] The purpose of this invention is to provide an immersive hot spring ORC power generation system that can efficiently and continuously provide hot spring hotels with electricity and hot spring water at a suitable temperature.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: an immersive hot spring ORC power generation system, comprising a low-grade organic Rankine cycle device, a geothermal hot spring heat exchange and storage system, and a detection and control assembly. The immersive evaporator of the low-grade organic Rankine cycle device is immersed in the heat exchange pool of the geothermal hot spring heat exchange and storage system for heat exchange. The detection and control assembly is coupled to the geothermal hot spring heat exchange and storage system to control the operation of the entire immersive hot spring ORC power generation system based on the detected liquid level and temperature information.

[0005] Furthermore, the low-grade organic Rankine cycle device includes an immersion evaporator, a turbine, a condenser, a working fluid pump, a water pump, and a cooling tower. The working fluid pump, immersion evaporator, turbine, and condenser are connected in sequence through pipelines to form an organic Rankine cycle loop. The water pump, condenser, and cooling tower are connected in sequence through pipelines to form a cooling water cycle loop. The low-grade organic working fluid in the organic Rankine cycle loop and the cooling water in the cooling water cycle loop exchange heat in the condenser.

[0006] Furthermore, the geothermal hot spring heat exchange and storage system includes a geothermal well, a centrifugal water pump, a heat exchange pool, a self-cooling water storage pool, a hot spring hotel, two shut-off valves, and two regulating valves. The geothermal well is connected to the centrifugal water pump via a pipeline, and the centrifugal water pump is connected to the inlet of the heat exchange pool via a pipeline, so that the hot spring water in the geothermal well enters the heat exchange pool. The first outlet of the heat exchange pool enters the self-cooling water storage pool after being connected to the first shut-off valve via a pipeline. The outlet of the self-cooling water storage pool enters the hot spring hotel after being connected to the first regulating valve via a pipeline. The second outlet of the heat exchange pool is connected to a pipeline that splits into two paths: one path connects to the second regulating valve and enters the hot spring hotel, and the other path connects to the second shut-off valve and is then drained.

[0007] Furthermore, the heat exchange pool and the self-cooling water storage pool were formed by splitting off the original water storage pool of the hot spring hotel.

[0008] Furthermore, the detection and control assembly includes a control device, a first liquid level sensor installed on the heat exchange pool, a first temperature sensor installed on the second outlet connecting pipe of the heat exchange pool, a second liquid level sensor and a second temperature sensor installed on the self-cooling water storage pool, and a first shut-off valve, a first regulating valve, a second regulating valve and a second shut-off valve coupled to the geothermal hot spring heat exchange and storage system. The control device controls the corresponding valve actions according to the detected liquid level and temperature information, thereby controlling the operation of the entire immersive hot spring ORC power generation system.

[0009] Furthermore, the operating method of the immersive hot spring ORC power generation system is as follows: When the system is first started, the detection and control assembly controls the centrifugal water pump to extract high-temperature hot spring water (80-100℃) from the geothermal well and pump it into the heat exchange pool. When the detection and control assembly detects through the first liquid level sensor that the liquid level in the heat exchange pool completely submerges the immersion evaporator, it controls the low-grade organic Rankine cycle device to start working. The working fluid pump drives the refrigerant to flow in the device. The low-temperature, high-pressure working fluid at the outlet of the working fluid pump enters the immersion evaporator and exchanges heat with the high-temperature hot spring water in the heat exchange pool to form high-temperature, high-pressure steam. After entering the turbine for adiabatic expansion and generating electricity, the temperature and pressure decrease and it enters the condenser. In the condenser, it exchanges heat with the cold water in the water pump and becomes a low-temperature, low-pressure liquid, which then enters the working fluid pump, forming an organic Rankine cycle loop and continuously providing electricity to the hot spring hotel. The cold water in the water pump exchanges heat with the condenser and becomes high-temperature hot water, which enters the cooling tower for cooling and then re-enters the water pump to form a cooling water cycle loop. After exchanging heat with the immersion evaporator, the high-temperature hot spring water in the heat exchange tank cools down to 60-70℃. When the detection and control assembly detects that the liquid level in the self-cooled water storage tank is lower than the set value through the second liquid level sensor, it controls the first shut-off valve to open, allowing the 60-70℃ hot spring water in the heat exchange tank to enter until it is full and then closes. At the same time, it controls the second shut-off valve to open for venting. When the detection and control assembly detects that the temperature of the 60-70℃ hot spring water in the self-cooled water storage tank has cooled down to room temperature through the second temperature sensor, the system begins its formal operation phase. Once the system enters its formal operating phase, the detection and control assembly controls the second shut-off valve to close. Based on the outlet water temperature of the heat exchange pool detected by the first temperature sensor and the water temperature in the self-cooling reservoir detected by the second temperature sensor, it controls the opening of the second regulating valve and the opening degree of the first regulating valve. This allows the higher-temperature water from the heat exchange pool outlet to mix with the room-temperature water from the self-cooling reservoir outlet in a specific ratio, resulting in 40-50℃ warm water required for hot spring bathing. Once the hot spring water required by the hot spring hotel is filled, the detection and control assembly controls the first shut-off valve to open, allowing the hot spring water from the heat exchange pool outlet to flow into the self-cooling reservoir until it is full. Simultaneously, based on the hot spring hotel's needs, the second regulating valve is controlled to continue injecting a small amount of higher-temperature water to maintain the temperature of the hot spring water in the hotel. The remaining water is drained by opening the second shut-off valve.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an immersive hot spring ORC power generation system that uses a low-grade heat source to generate electricity at high efficiency. The system can generate electricity using the high-temperature section of the hot spring, increase green electricity revenue and reduce carbon emissions. It can also reduce the cooling time of high-temperature hot water and efficiently provide hot spring hotels with hot spring water at a suitable temperature. The immersion design of the evaporator, which is immersed in the hot water pool, further reduces the system power consumption. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the immersive hot spring ORC power generation system according to an embodiment of the present invention. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0014] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0015] like Figure 1As shown, this embodiment provides an immersive hot spring ORC power generation system, including a low-grade organic Rankine cycle device, a geothermal hot spring heat exchange and storage system, and a detection and control assembly. The immersive evaporator of the low-grade organic Rankine cycle device is immersed in the heat exchange pool of the geothermal hot spring heat exchange and storage system for heat exchange. The detection and control assembly is coupled to the geothermal hot spring heat exchange and storage system to control the operation of the entire immersive hot spring ORC power generation system based on the detected liquid level and temperature information.

[0016] The low-grade organic Rankine cycle device includes an immersion evaporator 3, a turbine 10, a condenser 11, a working fluid pump 12, a water pump 13, and a cooling tower 14. The working fluid pump 12, immersion evaporator 3, turbine 10, and condenser 11 are sequentially connected via pipelines to form an organic Rankine cycle loop. The immersion evaporator 3 is submerged in the heat exchange pool 4 of the geothermal hot spring heat exchange and storage system, exchanging heat with the high-temperature hot spring water. The water pump 13, condenser 11, and cooling tower 14 are sequentially connected via pipelines to form a cooling water circulation loop. The low-grade organic working fluid in the organic Rankine cycle loop exchanges heat with the cooling water in the cooling water circulation loop within the condenser 11.

[0017] The geothermal hot spring heat exchange and storage system includes a geothermal well 1, a centrifugal water pump 2, a heat exchange pool 4, a self-cooling water storage pool 6, a hot spring hotel 9, two shut-off valves 5 and 16, and two regulating valves 7 and 8. The geothermal well 1 is connected to the centrifugal water pump 2 via a pipeline. The centrifugal water pump 2 is connected to the inlet of the heat exchange pool 4 via a pipeline, allowing hot spring water from the geothermal well 1 to enter the heat exchange pool 4. The first outlet of the heat exchange pool 4 is connected to the first shut-off valve 5 via a pipeline and then enters the self-cooling water storage pool 6. The outlet of the self-cooling water storage pool 6 is connected to the first regulating valve 7 via a pipeline and then enters the hot spring hotel 9. The second outlet of the heat exchange pool 4 is connected to a pipeline that splits into two paths: one path connects to the second regulating valve 8 and then enters the hot spring hotel 9, while the other path connects to the second shut-off valve 16 and then drains the water.

[0018] In this embodiment, the heat exchange pool 4 and the self-cooling water storage pool 6 are separated from the original water storage pool of the hot spring hotel. The specific implementation method is as follows: the original water storage pool is separated by two walls, leaving the middle empty to prevent heat exchange between the two pools. Pipes and a shut-off valve (i.e., the first shut-off valve 5) are installed between the two walls. The shut-off valve is opened and closed as needed to control whether the hot spring water is injected from the heat exchange pool into the self-cooling water storage pool.

[0019] The detection and control assembly 15 includes a control device, a first liquid level sensor installed on the heat exchange pool 4, a first temperature sensor installed on the second outlet connecting pipe of the heat exchange pool 4, a second liquid level sensor and a second temperature sensor installed on the self-cooling water storage pool 6, and a first shut-off valve 5, a first regulating valve 7, a second regulating valve 8 and a second shut-off valve 16 coupled to the geothermal hot spring heat exchange and storage system. The control device controls the corresponding valve actions according to the detected liquid level and temperature information, thereby controlling the operation of the entire immersive hot spring ORC power generation system.

[0020] Centrifugal water pump 2 draws high-temperature geothermal hot spring water at 80℃-100℃ and enters heat exchange pool 4 through pipeline. After heat exchange with immersion evaporator in heat exchange pool 4, the hot spring water outlet temperature is about 65℃. Part of it enters the self-cooling water storage tank through opening the first shut-off valve 5. After the tank is full, the first shut-off valve 5 is closed for natural cooling. The rest depends on the demand conditions. It can be mixed with room temperature water in self-cooling water storage tank 6 in proportion through the second regulating valve 8 and then enter the hot spring hotel, or it can be drained.

[0021] This embodiment also provides the working method of the above-mentioned immersive hot spring ORC power generation system, which is described in detail below.

[0022] When the system is first started, the detection and control assembly controls the centrifugal water pump 2 to draw high-temperature hot spring water (80℃-100℃) from the geothermal well 1 and pump it into the heat exchange tank 4. When the detection and control assembly 15 detects through the first liquid level sensor that the liquid level in the heat exchange tank 4 has completely submerged the immersed evaporator 3, it controls the low-grade organic Rankine cycle device to start working. The working fluid pump 12 drives the refrigerant (including but not limited to R245fa) to flow in the device, and the low-temperature, high-pressure working fluid at the outlet of the working fluid pump 12 enters the immersed evaporator. After exchanging heat with the high-temperature hot spring water in the heat exchange pool 4, the generator 3 forms high-temperature and high-pressure steam. After entering the turbine 10, the steam expands adiabatically and generates electricity. After the steam's temperature and pressure decrease, it enters the condenser 11. In the condenser 11, it exchanges heat with the cold water in the water pump 13 and becomes a low-temperature and low-pressure liquid. It then enters the working fluid pump 12, forming an organic Rankine loop and continuously providing power to the hot spring hotel 9. After exchanging heat with the condenser 11, the cold water in the water pump 13 becomes high-temperature hot water. It then enters the cooling tower 14 for cooling and re-enters the water pump 13, forming a cooling water loop.

[0023] After exchanging heat with the immersion evaporator 3, the high-temperature hot spring water in the heat exchange tank 4 cools down to 60-70°C, which is about 65°C in this embodiment. That is, the temperature of the hot spring water at the outlet of the heat exchange tank 4 is about 65°C. When the detection and control assembly 15 detects that the liquid level in the self-cooling water storage tank 6 is lower than the set value through the second liquid level sensor, it controls the first shut-off valve 5 to open, allowing the 65°C hot spring water in the heat exchange tank 4 to enter until it is full and then closes. At the same time, it controls the second shut-off valve 16 to open for venting. When the detection and control assembly 15 detects that the temperature of the 65°C hot spring water in the self-cooling water storage tank 6 has cooled down to room temperature through the second temperature sensor, the system begins the formal working stage.

[0024] After the system enters the formal working phase, the detection and control assembly 15 controls the second shut-off valve 16 to close. Based on the outlet water temperature of the heat exchange pool 4 detected by the first temperature sensor and the water temperature in the self-cooling water storage tank 6 detected by the second temperature sensor, it controls the second regulating valve 8 to open and the opening degree of the first regulating valve 7 to mix the higher temperature water at the outlet of the heat exchange pool 4 with the room temperature water at the outlet of the self-cooling water storage tank 6 in a certain proportion to produce 40℃-50℃ warm water required for hot spring bathing. This mixture then enters the hot spring hotel 9. Once the hot spring hotel 9 is full of the required hot spring water, the detection and control assembly 15 controls the first shut-off valve 5 to open, allowing the hot spring water from the outlet of the heat exchange pool 4 to flow into the self-cooling water storage tank 6 until it is full. At the same time, based on the needs of the hot spring hotel 9, the opening degree of the second regulating valve 8 is controlled to continue to inject a small amount of higher temperature water to maintain the temperature of the hot spring water in the hot spring hotel 9. The remaining water is drained by opening the second shut-off valve 16.

[0025] The hot spring water in the hot spring hotel is usually changed every one or two days. The high-temperature water of about 65°C in the self-cooled water storage tank 6 can be cooled to room temperature. By controlling the high-temperature hot spring water at the outlet of the heat exchange tank 4 through the detection and control assembly 15, the water at the outlet of the self-cooled water storage tank 6, which maintains room temperature, can be mixed to ensure a continuous supply of hot spring water in the hot spring hotel 9 and keep it at the most suitable temperature of 40°C-50°C.

[0026] Therefore, the immersive hot spring ORC power generation system provided by this invention can continuously supply hot spring hotels with electricity and hot spring water at a suitable temperature.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An immersive hot spring ORC power generation system, characterized in that, The system includes a low-grade organic Rankine cycle device, a geothermal hot spring heat exchange and storage system, and a detection and control assembly. The immersion evaporator of the low-grade organic Rankine cycle device is immersed in the heat exchange pool of the geothermal hot spring heat exchange and storage system for heat exchange. The detection and control assembly is coupled to the geothermal hot spring heat exchange and storage system to control the operation of the entire immersion hot spring ORC power generation system based on the detected liquid level and temperature information. The low-grade organic Rankine cycle device includes an immersion evaporator (3), a turbine (10), a condenser (11), a working fluid pump (12), a water pump (13), and a cooling tower (14). The working fluid pump (12), the immersion evaporator (3), the turbine (10), and the condenser (11) are connected in sequence through pipelines to form an organic Rankine cycle loop. The water pump (13), the condenser (11), and the cooling tower (14) are connected in sequence through pipelines to form a cooling water cycle loop. The low-grade organic working fluid in the organic Rankine cycle loop and the cooling water in the cooling water cycle loop exchange heat in the condenser (11). The geothermal hot spring heat exchange and storage system includes a geothermal well (1), a centrifugal water pump (2), a heat exchange pool (4), a self-cooling water storage pool (6), a hot spring hotel (9), two shut-off valves (5) and (16), and two regulating valves (7) and (8). The geothermal well (1) is connected to the centrifugal water pump (2) through a pipeline. The centrifugal water pump (2) is connected to the inlet of the heat exchange pool (4) through a pipeline so that the hot spring water in the geothermal well (1) enters the heat exchange pool (4). The first outlet of the heat exchange pool (4) enters the self-cooling water storage pool (6) after being connected to the first shut-off valve (5) through a pipeline. The outlet of the self-cooling water storage pool (6) enters the hot spring hotel (9) after being connected to the first regulating valve (7) through a pipeline. The second outlet of the heat exchange pool (4) is connected to two pipelines, one of which is connected to the second regulating valve (8) and enters the hot spring hotel (9), and the other is connected to the second shut-off valve (16) and empties. The detection and control assembly (15) includes a control device, a first liquid level sensor installed on the heat exchange pool (4), a first temperature sensor installed on the second outlet connection pipe of the heat exchange pool (4), a second liquid level sensor installed on the self-cooling water storage pool (6), a second temperature sensor, and a first shut-off valve (5), a first regulating valve (7), a second regulating valve (8), and a second shut-off valve (16) coupled to the geothermal hot spring heat exchange and storage system. The control device controls the corresponding valve actions according to the detected liquid level and temperature information, thereby controlling the operation of the entire immersive hot spring ORC power generation system.

2. The immersive hot spring ORC power generation system according to claim 1, characterized in that, The heat exchange pool (4) and the self-cooling water storage pool (6) were split from the original water storage pool of the hot spring hotel.

3. The immersive hot spring ORC power generation system according to claim 1, characterized in that, The working method of the immersive hot spring ORC power generation system is as follows: When the system is first started, the detection and control assembly controls the centrifugal water pump (2) to draw high-temperature hot spring water of 80-100℃ from the geothermal well (1) and pump it into the heat exchange pool (4). When the detection and control assembly (15) detects through the first liquid level sensor that the liquid level in the heat exchange pool (4) is completely submerged in the immersed evaporator (3), it controls the low-grade organic Rankine cycle device to start working. The working fluid pump (12) drives the refrigerant to flow in the device. The low-temperature and high-pressure working fluid at the outlet of the working fluid pump (12) enters the immersed evaporator (3) and the heat exchange pool (4). After the high-temperature hot spring water in the steam exchange heat, it becomes high-temperature and high-pressure steam. It enters the turbine (10) and expands adiabatically to generate electricity. After the steam temperature and pressure drop, it enters the condenser (11). In the condenser (11), it exchanges heat with the cold water in the water pump (13) and becomes a low-temperature and low-pressure liquid. It enters the working fluid pump (12) to form an organic Rankine loop and continuously provides power to the hot spring hotel (9). The cold water in the water pump (13) exchanges heat with the condenser (11) and becomes high-temperature hot water. It enters the cooling tower (14) and is cooled before re-entering the water pump (13) to form a cooling water loop. After the high-temperature hot spring water in the heat exchange tank (4) exchanges heat with the immersion evaporator (3), the temperature drops to 60-70℃. When the detection and control assembly (15) detects that the liquid level in the self-cooling water storage tank (6) is lower than the set value through the second liquid level sensor, it controls the first shut-off valve (5) to open, allowing the 60-70℃ hot spring water in the heat exchange tank (4) to enter until it is full and then closes. At the same time, it controls the second shut-off valve (16) to open for venting. When the detection and control assembly (15) detects that the temperature of the 60-70℃ hot spring water in the self-cooling water storage tank (6) has cooled to room temperature through the second temperature sensor, the system begins the formal working stage. After the system enters the formal working stage, the detection and control assembly (15) controls the second shut-off valve (16) to close. Based on the outlet water temperature of the heat exchange pool (4) detected by the first temperature sensor and the water temperature in the self-cooling water storage pool (6) detected by the second temperature sensor, the second regulating valve (8) is opened and the opening degree of the first regulating valve (7) is controlled so that the higher temperature water at the outlet of the heat exchange pool (4) and the room temperature water at the outlet of the self-cooling water storage pool (6) are mixed in proportion to the 40-50℃ warm water required for hot spring bathing and enter the hot spring hotel (9). When the hot spring hotel (9) is full of the required hot spring water, the detection and control assembly (15) controls the first shut-off valve (5) to open so that the hot spring water at the outlet of the heat exchange pool (4) is injected into the self-cooling water storage pool (6) until it is full. At the same time, the opening degree of the second regulating valve (8) is controlled according to the needs of the hot spring hotel (9) to continue to inject a small amount of higher temperature water to maintain the temperature of the hot spring water in the hot spring hotel (9). The remaining water is drained by opening the second shut-off valve (16).

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