TWI761221B - Geothermal power generation thermal adjustment pool organic Rankine cycle system - Google Patents

Abstract

A geothermal power generation heat adjustment pool-type organic Rankine cycle system includes organic Rankine cycle equipment and a geothermal supply module. The geothermal supply module includes a heat adjustment container, a geothermal supply pipeline unit, a heat exchange pipeline unit and a discharge pipeline unit. The thermal conditioning vessel keeps the temperature stable and defines the water storage space. The geothermal supply pipeline unit is used for inputting hot water into the water storage space and maintaining the hot water in the water storage space within a working temperature range. The heat exchange pipeline unit is used for transporting the hot water in the water storage space to the first flasher of the organic Rankine cycle device to exchange heat with the liquid working fluid. The drainage pipeline unit is used to discharge the hot water in the water storage space. The problem of direct water supply from geothermal wells can be solved by maintaining a constant amount and constant temperature of hot water to the organic Rankine cycle equipment through the thermal adjustment container.

Description

Geothermal power generation thermal adjustment pool organic Rankine cycle system

The present invention relates to a geothermal power generation organic Rankine cycle system, in particular to a geothermal power generation heat adjustment pool type organic Rankine cycle system that can provide a stable heat source.

The existing organic Rankine cycle system using geothermal power generation directly guides the hot water from the geothermal well into the flasher (that is, the heat exchanger) for heat exchange with the liquid working fluid, so that the liquid working fluid is vaporized and can drive the operation. Functional elements (such as turbines, screw expanders, scroll expanders, etc.), thereby converting thermal energy into mechanical rotational energy, and then converting the mechanical rotational energy into electrical output through a generator.

However, the water output of the geothermal well is unstable and the hot water is mixed with high-heat steam, which makes the fluid flow and pressure in the heating pipeline unstable, resulting in the flasher, pipeline and even the working element being subjected to rapid jumping and unstable pressure, which may easily lead to system failure. Valve or pipeline seam or flasher or even working element failure. In addition, insufficient hot water flow in the heating pipeline can easily lead to system failure or insufficient rated power, and frequent insufficient hot water flow will cause calcium silicate scaling in the system.

Therefore, one of the objectives of the present invention is to provide a geothermal power generation heat adjustment pool-type organic Rankine cycle system that can solve the aforementioned problems.

Therefore, in some embodiments, the geothermal power generation heat adjustment pool-type organic Rankine cycle system of the present invention includes: an organic Rankine cycle device and a geothermal supply module. The organic Rankine cycle device includes a first flasher through which the liquid working fluid passes. The geothermal supply module includes a heat adjustment container, a geothermal supply pipeline unit, a heat exchange pipeline unit and a drainage pipeline unit. The thermal adjustment container is thermally insulated and defines a water storage space. The geothermal supply pipeline unit includes a hot water input pipeline with one end connected to the heat regulation container and one end connected to a geothermal well, and a heat source throttle valve connected to the hot water input pipeline. The heat source throttle valve is used for The hot water in the water storage space is automatically opened and closed according to the temperature of the hot water in the water storage space, so that the hot water in the water storage space is maintained within a working temperature range. The heat exchange pipeline unit includes a circulation pipeline connected to the heat adjustment container at both ends and passing through the first flasher, and a flow control pump connected to the circulation pipeline for the heat in the water storage space. Water is delivered to the first flasher at a certain flow rate for heat exchange with the liquid working fluid. The discharge pipeline unit includes a hot water discharge pipeline connected to the thermal adjustment container at one end, and a liquid level gauge disposed in the thermal adjustment container and connected to the hot water discharge pipeline. The discharge pipeline unit is used to The excess hot water in the water storage space is discharged.

In some embodiments, the geothermal supply module further includes an automatic vapor pressure control valve disposed in the thermal adjustment vessel to adjust the vapor pressure in the thermal adjustment vessel.

In some embodiments, the organic Rankine cycle device further includes a second flasher through which the liquid working fluid passes, and the geothermal supply module further includes a vapor delivery pipeline, one end of which is connected to the vapor delivery pipeline. The heat adjustment container passes through the second flasher and the other end is communicated with the outside world, and is used for transporting the vapor in the water storage space to the second flasher for heat exchange with the liquid working fluid.

In some embodiments, the other end of the hot water discharge pipeline is used for connecting to a reinjection well, the drainage pipeline unit further includes a reinjection booster pump connected to the hot water discharge pipeline, and the reinjection A pressurizing pump is coupled to the level gauge to initiate drainage in synchronization with the level gauge.

In some embodiments, the wall of the thermal adjustment container has an inner layer, an outer layer, and a thermal insulation layer filled between the inner layer and the outer layer.

In some embodiments, the material of the inner layer and the outer layer is metal, and the material of the heat insulating layer is hollow glass beads.

In some embodiments, the operating temperature range is between 96°C and 110°C.

The present invention has at least the following effects: the hot water at a constant and constant temperature is maintained by the thermal adjustment container, so that the flow and temperature of the hot water entering the first flasher of the organic Rankine cycle equipment are stable, thereby solving the problem of geothermal wells Problems caused by unstable fluid flow and pressure in direct water supply.

Referring to FIG. 1 , an embodiment of the geothermal power generation heat adjustment pool-type organic Rankine cycle system of the present invention includes an organic Rankine cycle device 1 and a geothermal supply module 2 .

The organic Rankine cycle device 1 includes a first flasher 11, a second flasher 12, a working element 13, a generator 14, a condenser 15, a working fluid storage tank 16, a working fluid heater Pressure pump 17 and a working fluid pipeline 18 . The working fluid storage tank 16 is used to store the organic liquid working fluid, and the working fluid is pressurized and transported in the working fluid pipeline 18 by the working fluid pressurizing pump 17, so that a part of the liquid working fluid flows through the first flasher 11, and the other part flows through the first flasher 11. The second flasher 12 conducts heat exchange and converts it into high-temperature and high-pressure steam. The working fluid in the state of high-temperature and high-pressure steam enters the working element 13 to be converted into mechanical rotational energy, and then the mechanical rotational energy is converted into electrical output by the generator 14 , the working fluid passing through the working element 13 is turned into a low-pressure vapor, and then turned into a low-pressure liquid through the condenser 15 and then returned to the working fluid storage tank 16 . The working principle of the organic Rankine cycle device 1 is a known technology and is not the focus of the present invention, and will not be described in detail here.

The geothermal supply module 2 includes a heat regulation container 21 , a geothermal supply pipeline unit 22 , a heat exchange pipeline unit 23 , a discharge pipeline unit 24 , an automatic vapor pressure control valve 25 and a vapor delivery pipeline 26 .

The thermal adjustment container 21 can be kept warm and defines a water storage space 211 . Specifically, the wall of the heat-adjusting container 21 is preferably made of a material capable of heat insulation. In this embodiment, the wall of the heat-adjusting container 21 has an inner layer, an outer layer and is filled with the inner layer and the outer layer. A heat insulating layer between the outer layers, the material of the inner layer and the outer layer is preferably metal, and the material of the heat insulating layer is preferably hollow glass beads, and the thickness of the heat insulating layer is at least 10 cm, It is used to preserve the water temperature of the hot water from the geothermal well in the water storage space 211 and maintain the water temperature stably. The heat-adjusting container 21 can also be made of other heat-insulating materials, such as reinforced concrete or refractory bricks. The capacity of the water storage space 211 may be determined by the flow of hot water required by the organic Rankine cycle device 1 , and it is preferable to store and supply the water required for the operation of the organic Rankine cycle device 1 for 4 hours, and the water storage space 211 It is also necessary to reserve 1/4 of the volume to accommodate steam to achieve the effect of gas and water separation.

The geothermal supply pipeline unit 22 includes a hot water input pipeline 221 connected to the thermal adjustment container 21 at one end and a geothermal well at the other end, and a heat source throttle valve 222 connected to the hot water input pipeline 221 . The heat source throttle valve 222 is automatically opened and closed according to the temperature of the hot water in the water storage space 211 , so that the hot water in the water storage space 211 is maintained within a working temperature range. In this embodiment, the operating temperature range is between 96°C and 110°C. Specifically, one end of the hot water input pipeline 221 is placed in a geothermal well, and the geothermal well generally has a pressure of 2.5kg/cm ² to provide geothermal water without using a pump to pressurize, and the hot water input pipeline The other end of 221 is connected to the water storage space 211. When the heat source throttle valve 222 is opened, high-temperature hot water can be injected into the water storage space 211. When the heat source throttle valve 222 is closed, the injection of hot water is stopped. . The heat source throttling valve 222 automatically detects the water temperature in the water storage space 211 . When the water temperature is lower than 96°C, the water injection is turned on, and when the water temperature is higher than 110°C, the water injection is turned off.

The heat exchange line unit 23 includes a circulation line 231 connected to the heat adjustment container 21 at both ends and passing through the first flasher 11, and a flow control pump 232 connected to the circulation line 231 for conveying the The hot water in the water storage space 211 exchanges heat with the liquid working fluid to the first flasher 11 . That is to say, the flow control pump 232 controls the flow of hot water flowing through the first flasher 11 to meet the flow rate of high-temperature hot water per second required by the organic Rankine cycle device 1 . The hot water flowing through the first flasher 11 and the liquid working fluid will be cooled and returned to the water storage space 211 after heat exchange.

The drainage pipeline unit 24 includes a hot water discharge pipeline 241 connected to the thermal adjustment container 21 at one end, a liquid level gauge 242 disposed in the thermal adjustment container 21 and connected to the hot water discharge pipeline 241 , and a connection The refilling booster pump 243 of the hot water discharge line 241 is coupled to the liquid level gauge 242 to start water drainage synchronously with the liquid level gauge 242 . In this embodiment, the other end of the hot water discharge pipeline 241 is connected to a reinjection well, and the drainage pipeline unit 24 is used to discharge the hot water in the water storage space 211 and inject it back into the original formation. Specifically, since the hot water flowing through the first flasher 11 returns to the water storage space 211, the water temperature in the water storage space 211 will drop. When the water temperature is lower than 96°C, the The heat source throttle valve 222 will be opened to supplement the hot water, and when the amount of supplemented water is greater than the predetermined water level in the water storage space 211, the liquid level gauge 242 will start to drain water, and the refilling pressurizing pump 243 will start to pressurize synchronously. The relatively low-temperature hot water is sent into the reinjection well, thereby maintaining the hot water in the water storage space 211 within a certain water volume and temperature range.

In this embodiment, the automatic vapor pressure control valve 25 is arranged on the top of the thermal adjustment vessel 21 to adjust the vapor pressure in the thermal adjustment vessel 21 , and one end of the vapor delivery pipeline 26 is connected to the thermal adjustment vessel 21 . The other end is connected to the outside through the second flasher 12 , so as to transport the vapor in the water storage space 211 to the second flasher 12 for heat exchange with the liquid working fluid. That is to say, the high-temperature steam in the heat adjustment container 21 is transported to the second flasher 12 through the steam conveying pipeline 26 for heat exchange with the liquid working fluid, and the high-temperature steam becomes low-temperature water after the heat exchange and is directly discharged. into the environment. By splitting hot water and high-temperature steam to pass through the first flasher 11 and the second flasher 12 respectively, not only can the heat source be fully utilized, but also gas and liquid can be separated so that the flow of hot water can be easily controlled.

To sum up, the hot water flow and temperature of the first flasher 11 of the organic Rankine cycle device 1 can be stabilized by maintaining a constant amount and a constant temperature of hot water in the thermal adjustment container 21 , thereby solving the problem of geothermal energy. Problems arising from fluid flow and pressure instability in the direct water supply to the well.

However, the above are only examples of the present invention, and should not limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the application for patent of the present invention and the content of the patent specification are still within the scope of the present invention. within the scope of the invention patent.

1: Organic Rankine Cycle Equipment 11: The first flasher 12: Second Flasher 13: Working element 14: Generator 15: Condenser 16: Working fluid reservoir 17: Working fluid pressurized pump 18: Working fluid pipeline 2: Geothermal supply module 21: Heat Adjustment Vessel 211: Water storage space 22: Geothermal supply piping unit 221: Hot water input pipeline 222: Heat source throttle valve 23: Heat exchange piping unit 231: Circulation pipeline 232: Flow Control Pump 24: Drain pipe unit 241: Hot water discharge line 242: Level gauge 243: Reinjection booster pump 25: Automatic vapor pressure control valve 26: Steam delivery line

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a schematic diagram of an embodiment of the geothermal power generation heat adjustment pool organic Rankine cycle system of the present invention.

1: Organic Rankine Cycle Equipment

11: The first flasher

12: Second Flasher

13: Working element

14: Generator

15: Condenser

16: Working fluid reservoir

17: Working fluid pressurized pump

18: Working fluid pipeline

2: Geothermal supply module

21: Heat Adjustment Vessel

211: Water storage space

22: Geothermal supply piping unit

221: Hot water input pipeline

222: Heat source throttle valve

23: Heat exchange piping unit

231: Circulation pipeline

232: Flow Control Pump

24: Drain pipe unit

241: Hot water discharge line

242: Level gauge

243: Reinjection booster pump

25: Automatic vapor pressure control valve

26: Steam delivery line

Claims (5)

A geothermal power generation heat adjustment pool-type organic Rankine cycle system, comprising: an organic Rankine cycle device, including a first flasher and a second flasher for a liquid working fluid to pass through; and a geothermal supply module, It includes a heat regulation container, which can keep heat and define a water storage space, a geothermal supply pipeline unit, including a hot water input pipeline connected to the heat regulation container at one end and a geothermal well at one end, and a hot water input pipeline connected to the hot water. The heat source throttle valve of the input pipeline is used to automatically open and close according to the temperature of the hot water in the water storage space, so that the hot water in the water storage space is maintained within a working temperature range, a heat exchange The pipeline unit includes a circulating pipeline connected with the heat adjustment container at both ends and passing through the first flasher, and a flow control pump connected with the circulating pipeline, used to transport the hot water in the water storage space to the The first flasher exchanges heat with the liquid working fluid, and a discharge pipeline unit includes a hot water discharge pipeline with one end connected to the heat adjustment container and the other end connected to a return injection well, A liquid level gauge connected to the adjustment container and connected to the hot water discharge pipeline, and a refilling pressure pump connected to the hot water discharge pipeline, and the refilling pressure pump is coupled to the liquid level gauge to communicate with the liquid The level meter starts the drain synchronously, the drain line unit It is used to discharge the hot water in the water storage space, and a steam conveying pipeline, one end of the steam conveying pipeline is connected to the heat adjustment container, and the other end is connected to the outside through the second flasher, so as to The high-temperature vapor in the water storage space is sent to the second flasher for heat exchange with the liquid working fluid. The geothermal power generation heat-regulating pool-type organic Rankine cycle system according to claim 1, wherein the geothermal supply module further comprises an automatic vapor pressure control valve disposed in the heat-regulating vessel to adjust the vapor in the thermal-regulating vessel pressure. The geothermal power generation heat-regulating pool-type organic Rankine cycle system of claim 1, wherein the wall of the heat-regulating container has an inner layer, an outer layer, and a thermal insulation layer filled between the inner layer and the outer layer . The organic Rankine cycle system of the geothermal power generation heat adjustment pool according to claim 3, wherein the material of the inner layer and the outer layer is metal, and the material of the heat insulating layer is hollow glass beads. The organic Rankine cycle system of the geothermal power generation heat adjustment pool type according to claim 1, wherein the working temperature range is between 96°C and 110°C.

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