Medium-deep layer underground heat exchange and supply system with photovoltaic power generation and flow battery adjustment functions

Abstract

The utility model is applicable to the technical field of development and utilization of geothermal energy, and provides a photovoltaic power generation and flow battery regulation mid-deep underground heat exchange and supply system which comprises an underground heat exchanger and a heat pump unit which are connected through a water supply pipeline and a water return pipeline. The water supply pipeline is provided with a first flow regulating valve and a first circulating water pump, the water return pipeline is provided with a first gate valve, the heat pump unit is electrically connected with a power supply module, the power supply module comprises a photovoltaic cell panel and a flow battery, the photovoltaic cell panel is electrically connected with a controller, and the controller is electrically connected with a water pump. The controller is electrically connected with the heat pump unit through a first power supply wire, the controller is electrically connected with the heat pump unit through a second power supply wire, and the second power supply wire is provided with a second control switch, a flow battery, a third control switch and a second inverter. The system has the advantages of photovoltaic heat supply, accurate and flexible control, electricity saving, cost reduction and promotion of clean energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal energy development and utilization, and in particular to a medium-deep underground heat exchange and heating system with photovoltaic power generation and liquid flow battery regulation. Background Art

[0002] Patent 201920238875.3 proposes a cross-seasonal geothermal energy development system that stores renewable energy in geothermal reservoirs. The system involves a winter multi-energy complementary heating mode, a summer cooling mode, and a cross-seasonal heat storage mode, including the current development and utilization mode of the entire geothermal energy cycle, and the above-ground part involves a multi-stage plate exchanger and a cascade utilization system circulation pump. The above-ground heating part is designed based on the method of cascade utilization of geothermal energy, and combines multiple types of operating modes for multi-energy complementation. The underground heat extraction part divides the low-temperature zone and the high-temperature zone according to the quality of renewable energy, which improves the recovery capacity of the geothermal gradient. The switching of different energy development modes is mainly achieved by setting a switchable geothermal well seal between the low-temperature zone and the high-temperature zone of the geothermal reservoir.

[0003] Although the operation mode is comprehensive, the design is not rigorous enough. The order of actual operation should be winter multi-energy complementary heating mode, cross-seasonal heat storage mode and summer cooling mode. The energy grade of medium and deep geothermal energy is relatively high, and its heating capacity is more prominent. After the winter heating mode ends, the rock and soil temperature drops and there is a certain heat storage capacity. After the cross-seasonal heat storage mode, the rock and soil temperature is restored. Whether the rock and soil has cooling capacity remains to be determined.

[0004] The setting of low-temperature and high-temperature zones in geothermal reservoirs is relatively broad and not very maneuverable. In actual applications, the diversity of heat sources selected for cross-seasonal heat storage and transient changes in the cooling process cause the system's operation to be highly non-steady-state, which will cause fluctuations in the temperature of the heat storage. There is uncertainty about how to clearly divide the low-temperature and high-temperature zones and how to apply them.

[0005] Therefore, in view of the above situation, there is an urgent need to develop a medium-deep underground heat exchange heating system with photovoltaic power generation and liquid flow battery regulation to overcome the shortcomings in current practical applications. Utility Model Content

[0006] The purpose of the embodiment of the utility model is to provide a medium-deep underground heat exchange and heating system with photovoltaic power generation and liquid flow battery regulation, aiming to reduce the electricity cost of the power grid and realize the consumption of clean renewable energy.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A medium-deep underground heat exchange and heating system with photovoltaic power generation and liquid flow battery regulation, comprising an underground heat exchanger and a heat pump unit, wherein the heat pump unit is connected to a heat user, and the underground heat exchanger and the heat pump unit are connected via a water supply pipeline and a return pipeline, a first flow regulating valve and a first circulating water pump are fixedly provided on the water supply pipeline, a first gate valve is fixedly provided on the return pipeline, and the heat pump unit is also electrically connected to a power supply module, the power supply module comprises a photovoltaic panel and a liquid flow battery, a controller is electrically connected to the photovoltaic panel, the controller is electrically connected to the heat pump unit via a first power supply wire, a first control switch and a first inverter are fixedly provided on the first power supply wire in sequence, the controller is also electrically connected to the heat pump unit via a second power supply wire, and a second control switch, a liquid flow battery, a third control switch and a second inverter are fixedly provided on the second power supply wire in sequence.

[0009] According to a further technical solution, a second temperature sensor, a second flow sensor and a second pressure sensor are fixedly installed on the water supply pipeline, and a first temperature sensor, a first flow sensor and a first pressure sensor are fixedly installed on the return water pipeline.

[0010] According to a further technical solution, a second electric power monitoring and feedback device is electrically connected between the controller and the photovoltaic panel, a first electric power monitoring and feedback device is electrically connected between the controller and the heat pump unit, and a third electric power monitoring and feedback device is electrically connected between the controller and the liquid flow battery.

[0011] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art:

[0012] System design concept: reduce the cost of grid electricity consumption, realize the consumption of clean renewable energy, use photovoltaic panels and safer liquid flow battery combination modules to convert clean renewable energy solar energy into electricity, drive the electrical devices in the system, replace part of the grid electricity, and realize safe, efficient and low-carbon heating;

[0013] System operation principle: through the setting of electric power monitoring and feedback devices and controllers, the power consumption and power supply relationship between the power-consuming device (heat pump unit) and the power supply module (photovoltaic panels and flow batteries) is determined, and the power supply and storage operation mechanism of the power supply module is established to achieve precise and flexible control of solar photovoltaic power generation in the heating system.

[0014] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the power supply part of the utility model.

[0017] In the figure: 1-downhole heat exchanger, 2-first gate valve, 3-first temperature sensor, 4-first flow sensor, 5-first pressure sensor, 6-first flow regulating valve, 7-first circulating water pump, 8-second temperature sensor, 9-second flow sensor, 10-second pressure sensor, 11-heat pump unit, 12-heat user, 13-photovoltaic panel, 14-flow battery, 15-first electric power monitoring and feedback device, 16-second electric power monitoring and feedback device, 17-controller, 18-first control switch, 19-first inverter, 20-second control switch, 21-third electric power monitoring and feedback device, 22-third control switch, 23-second inverter, 24-first power supply wire, 25-second power supply wire. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0020] like Figure 1-2 As shown, the embodiment of the utility model provides a medium-deep underground heat exchange and heating system with photovoltaic power generation and liquid flow battery regulation, including an underground heat exchanger 1 and a heat pump unit 11, the heat pump unit 11 is connected to a heat user 12, the underground heat exchanger 1 and the heat pump unit 11 are connected through a water supply pipeline (not marked in the figure) and a return water pipeline (not marked in the figure), a first flow regulating valve 6 and a first circulating water pump 7 are fixedly arranged on the water supply pipeline, and a first gate valve 2 is fixedly arranged on the return water pipeline, the first gate valve 2, the first flow regulating valve 6 and the first circulating water pump 7 control the circulating flow in the underground heat exchanger 1 in a coordinated manner The heat pump unit 11 is also electrically connected to a power supply module, and the power supply module includes a photovoltaic panel 13 and a liquid flow battery 14. The photovoltaic panel 13 is electrically connected to a controller 17. The controller 17 is electrically connected to the heat pump unit 11 through a first power supply wire 24. The first power supply wire 24 is fixedly provided with a first control switch 18 and a first inverter 19 in sequence. The controller 17 is also electrically connected to the heat pump unit 11 through a second power supply wire 25, and the second power supply wire 25 is fixedly provided with a second control switch 20, a liquid flow battery 14, a third control switch 22 and a second inverter 23 in sequence.

[0021] It is understandable that due to the unstable characteristics of solar energy and considering the safety of the system, a safer liquid flow battery 14 is used as a power storage device, and the second inverter 23 and the first inverter 19 are both used to convert direct current into alternating current.

[0022] Furthermore, a second temperature sensor 8, a second flow sensor 9 and a second pressure sensor 10 are fixedly installed on the water supply pipeline, and a first temperature sensor 3, a first flow sensor 4 and a first pressure sensor 5 are fixedly installed on the return water pipeline. The first temperature sensor 3, the first flow sensor 4, the first pressure sensor 5, the second temperature sensor 8, the second flow sensor 9 and the second pressure sensor 10 detect the fluid temperature and flow in a coordinated manner.

[0023] Furthermore, a second electric power monitoring and feedback device 16 is electrically connected between the controller 17 and the photovoltaic panel 13, and the second electric power monitoring and feedback device 16 is used to detect the power supply of the photovoltaic panel 13. A first electric power monitoring and feedback device 15 is electrically connected between the controller 17 and the heat pump unit 11, and the first electric power monitoring and feedback device 15 is used to detect the power consumption of the heat pump unit 11. A third electric power monitoring and feedback device 21 is electrically connected between the controller 17 and the liquid flow battery 14, and the third electric power monitoring and feedback device 21 is used to detect the storage power of the liquid flow battery 14.

[0024] In the embodiment of the utility model, the circulation flow in the downhole heat exchanger 1 is controlled by the cooperation of the first gate valve 2, the first flow regulating valve 6 and the first circulating water pump 7, the heat pump unit 11 is powered by the cooperation of the photovoltaic panel 13 and the liquid flow battery 14, the direct current is converted into alternating current by the second inverter 23 and the first inverter 19, the fluid temperature and flow are detected by the cooperation of the first temperature sensor 3, the first flow sensor 4, the first pressure sensor 5, the second temperature sensor 8, the second flow sensor 9 and the second pressure sensor 10, the power supply power of the photovoltaic panel 13 is detected by the second electric power monitoring and feedback device 16, the power consumption of the heat pump unit 11 is detected by the first electric power monitoring and feedback device 15, and the storage power of the liquid flow battery 14 is detected by the third electric power monitoring and feedback device 21, so as to realize precise and flexible control of solar photovoltaic power generation in the heating system, effectively reduce the electricity cost of the power grid, and promote the consumption of clean renewable energy.

[0025] The working principle of the utility model is: open the first circulating water pump 7, the first gate valve 2, and the first flow regulating valve 6, jointly control the circulating flow in the downhole heat exchanger 1, and then detect the fluid temperature and flow through the first temperature sensor 3, the first flow sensor 4, the first pressure sensor 5, the second temperature sensor 8, the second flow sensor 9, and the second pressure sensor 10. The fluid flowing out of the downhole heat exchanger 1 enters the heat pump unit 11 to further improve the energy grade and then is transported to the heat user 12. The heat pump unit 11 needs to be driven by electricity during operation. The photovoltaic panel 13 converts solar energy into electrical energy. In the process of transporting it to the heat pump unit 11, the first electric power monitoring and feedback device 15 and the second electric power monitoring and feedback device 16 respectively test the electric power used by the heat pump unit 11. The power supply power of the photovoltaic panel 13 is determined by the controller 17. The signal is transmitted to the controller 17. By judging the relationship between the two, when the power supply power of the photovoltaic panel 13 is equal to the power consumption of the heat pump unit 11, the first control switch 18 is turned on, and the direct current is converted into alternating current through the first inverter 19 to supply power to the heat pump unit 11; when the power supply power of the photovoltaic panel 13 is greater than the power consumption of the heat pump unit 11, the controller 17 controls the power supply power, and turns on the first control switch 18 and the second control switch 20 at the same time. While supplying power to the heat pump unit 11, the liquid flow battery 14 is stored with electricity. The storage capacity is monitored by the third power monitoring and feedback device 21 and fed back to the controller 17. When the power of the liquid flow battery 14 reaches saturation, the second control switch 20 is turned off to stop charging. The capacity of the photovoltaic panel 13 and the liquid flow battery 14 is designed according to the characteristics of solar energy illumination in different regions, and sufficient electricity is stored in the stage of sufficient illumination. When the power supply of the photovoltaic panel 13 is unstable, the second control switch 20 and the third control switch 22 are turned on, and the liquid flow battery 14 provides auxiliary power supply, and the direct current is converted into alternating current through the second inverter 23 to power the heat pump unit 11; when the photovoltaic panel 13 and the liquid flow battery 14 as a whole cannot provide stable electricity for the system, the controller 17 sends an alarm signal to stop the operation of the power supply modules of the photovoltaic panel 13 and the liquid flow battery 14, and adopts the traditional power grid power supply method to power the heat pump unit 11.

[0026] The circuits, electronic components and modules involved are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by this utility model does not involve improvements to software and methods.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium-deep underground heat exchange and heating system with photovoltaic power generation and liquid flow battery regulation, comprising an underground heat exchanger and a heat pump unit, wherein the heat pump unit is connected to a heat user, and the underground heat exchanger and the heat pump unit are connected through a water supply pipeline and a return water pipeline, characterized in that: A first flow regulating valve and a first circulating water pump are fixedly arranged on the water supply pipeline, a first gate valve is fixedly arranged on the return water pipeline, and a power supply module is also electrically connected to the heat pump unit, the power supply module includes a photovoltaic panel and a liquid flow battery, a controller is electrically connected to the photovoltaic panel, the controller is electrically connected to the heat pump unit through a first power supply wire, a first control switch and a first inverter are fixedly arranged on the first power supply wire in sequence, the controller is also electrically connected to the heat pump unit through a second power supply wire, and a second control switch, a liquid flow battery, a third control switch and a second inverter are fixedly arranged on the second power supply wire in sequence.

2. The photovoltaic power generation and flow battery regulation medium-deep underground heat exchange and heating system according to claim 1 is characterized in that: The water supply pipeline is also fixedly provided with a second temperature sensor, a second flow sensor and a second pressure sensor, and the return water pipeline is also fixedly provided with a first temperature sensor, a first flow sensor and a first pressure sensor.

3. The photovoltaic power generation and flow battery regulation medium-deep underground heat exchange and heating system according to claim 2 is characterized in that: A second electric power monitoring and feedback device is electrically connected between the controller and the photovoltaic panel, a first electric power monitoring and feedback device is electrically connected between the controller and the heat pump unit, and a third electric power monitoring and feedback device is electrically connected between the controller and the liquid flow battery.

Images