Terrestrial heat-valley electricity-solar energy multi-energy collaborative heat supply system

Abstract

The invention provides a terrestrial heat-valley electricity-solar energy multi-energy collaborative heat supply system, which relates to the technical field of heat supply and comprises a terrestrial heat well, a first circulating pipeline, a heat exchanger, a first circulating pump and a valley section power supply end, the geothermal well is communicated with the geothermal end of the heat exchanger through the first circulating pipeline, the user end of the heat exchanger is used for being communicated with a heat using terminal so as to supply heat to the heat using terminal, the first circulating pump is arranged on the first circulating pipeline, and the valley section power supply end is electrically connected with the first circulating pump. According to the invention, the electric charge for heating the low-temperature water into the hot water required by the heat utilization terminal is reduced, and the power supply load of the power grid can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, and in particular, to a geothermal-valley electricity-solar multi-energy collaborative heating system. Background Art

[0002] In the related art, for the centralized heating method, during the night stage of the heating season, the heater in the heating station or heat exchange station is powered by the power grid, so that the heater heats the low-temperature water, and then the heated water is transported to the user end (i.e., the heat-using terminal) through the pipeline. The heated hot water can be used as the heat source for the user's floor heating or for daily use.

[0003] However, since the demand for hot water by users is very large in winter, that is, during the heating season, the method of electrically heating the heater by the power grid consumes a large amount of electric energy, resulting in a large power supply load borne by the power grid. Summary of the Invention

[0004] The problem solved by the present invention is how to effectively reduce the power supply load of the power grid that heats the low-temperature water to the hot water required by the heat-using terminal.

[0005] To solve the above problems, the present invention provides a geothermal-valley electricity-solar multi-energy collaborative heating system.

[0006] In a first aspect, the present invention provides a geothermal-valley electricity-solar multi-energy collaborative heating system, including a geothermal well, a first circulation pipeline, a heat exchanger, a first circulation pump, and a valley-section power supply end. The geothermal well is connected to the geothermal end of the heat exchanger through the first circulation pipeline. The user end of the heat exchanger is used to be connected to the heat-using terminal for heating the heat-using terminal. The first circulation pump is arranged on the first circulation pipeline, and the valley-section power supply end is electrically connected to the first circulation pump.

[0007] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a phase change heat accumulator, and the phase change heat accumulator is connected between the heat exchanger and the heat-using terminal.

[0008] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a photovoltaic device, a storage battery, and a solid heat accumulator. The photovoltaic device is electrically connected to the storage battery. The solid heat accumulator includes a heat accumulator main body and a heater. The storage battery is electrically connected to the heater. The heater is connected to the heat accumulator main body for heating the heat accumulator main body. The heat accumulator main body is connected to the heat-using terminal for heating the heat-using terminal.

[0009] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a second circulation pipeline and a second circulation pump. The solid heat accumulator is connected to the heat-using terminal through the second circulation pipeline, and the second circulation pump is arranged on the second circulation pipeline.

[0010] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a first switch and a heat pump. The first switch is arranged on the pipeline between the phase change heat accumulator and the heat-using terminal, and is used to control the connection or disconnection between the phase change heat accumulator and the heat-using terminal. The heat pump has a geothermal side and a user side. The geothermal side of the heat pump is connected in series to the first circulation pipeline between the inlet of the geothermal well and the outlet of the heat exchanger. The user side of the heat pump is connected to the heat-using terminal, and the user side of the heat pump is used to supply heat to the heat-using terminal. The storage battery is electrically connected to the heat pump.

[0011] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a third switch. The third switch is arranged on the pipeline between the heat accumulator main body and the heat-using terminal, and is used to control the connection or disconnection between the heat accumulator main body and the heat-using terminal.

[0012] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a fourth switch and a heat pump. The fourth switch is arranged on the pipeline between the geothermal well and the heat-using terminal, and is used to control the connection or disconnection between the geothermal well and the heat exchanger. The heat pump has a geothermal side and a user side. The geothermal side of the heat pump is connected to the geothermal well, and the user side of the heat pump is connected to the heat-using terminal. The storage battery is electrically connected to the heat pump.

[0013] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a third circulation pipeline and a third circulation pump. The solid heat accumulator and the phase change heat accumulator are connected through the third circulation pipeline, and the third circulation pump is arranged on the third circulation pipeline.

[0014] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a storage battery and a solid heat accumulator. The valley-section power supply end is electrically connected to the storage battery, and the storage battery is electrically connected to the solid heat accumulator. The user end of the heat exchanger is connected to the solid heat accumulator.

[0015] Optionally, the geothermal-valley electricity-solar multi-energy collaborative heating system includes two first circulation pumps, and the first circulation pumps are respectively arranged on the pipeline between the geothermal well and the heat exchanger and on the pipeline between the heat exchanger and the heat-using terminal.

[0016] The beneficial effects of the geothermal-valley electricity-solar multi-energy collaborative heating system of the present invention are as follows: During the night stage of the heating season, the valley-section power supply terminal can be electrically connected to the first circulation pump to provide power for the operation of the first circulation pump. Since the geothermal well is connected to the geothermal end of the heat exchanger through the first circulation pipeline, and the first circulation pump is arranged on the first circulation pipeline, the geothermal fluid output from the geothermal well is driven by the first circulation pump to enter the geothermal end of the heat exchanger along the first circulation pipeline, so that the geothermal end of the heat exchanger absorbs geothermal energy. Since the user end of the heat exchanger is connected to the user terminal, the geothermal energy at the geothermal end of the heat exchanger is used to heat the fluid at the user end of the heat exchanger to form hot water and deliver it to the heat-using terminal. Among them, the valley-section power supply terminal refers to the power grid in the valley-section of the electricity price at night. In other words, the geothermal energy corresponding to the geothermal well can be heat-exchanged with the water flow at the user end of the heat exchanger through the heat exchanger, and cooperate with the low-price electric energy corresponding to the valley-section power supply terminal that drives the operation of the first circulation pump. On the basis of providing stable hot water (or heat energy) for the heat-using terminal, it not only reduces the electricity cost of heating the low-temperature water to the hot water required by the heat-using terminal, but also reduces the power supply load of the power grid. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the pipeline operation of the geothermal-valley electricity-solar multi-energy collaborative heating system in the night stage of the heating season in the embodiment of the present invention; Figure 2 It is a schematic diagram of the pipeline operation of the geothermal-valley electricity-solar multi-energy collaborative heating system in the day stage of the heating season in the embodiment of the present invention; Figure 3 It is a schematic diagram of the pipeline operation when the heat storage capacities of the two heat accumulators in the geothermal-valley electricity-solar multi-energy collaborative heating system in the embodiment of the present invention are insufficient; Figure 4 It is a schematic diagram of the pipeline operation when extreme weather occurs in the heating season in the geothermal-valley electricity-solar multi-energy collaborative heating system in the embodiment of the present invention; Figure 5 It is a schematic diagram of the pipeline operation of the geothermal-valley electricity-solar multi-energy collaborative heating system in the day stage of the non-heating season in the embodiment of the present invention; Figure 6 It is a schematic diagram of the pipeline operation of the geothermal-valley electricity-solar multi-energy collaborative heating system in the night stage of the non-heating season in the embodiment of the present invention; Figure 7 It is a schematic diagram of the overall pipeline structure of the geothermal-valley electricity-solar multi-energy collaborative heating system in the embodiment of the present invention.

[0018] Description of the Reference Numerals: 1 - Geothermal well; 2 - Phase change heat accumulator; 3 - First circulation pump; 4 - Valley section power supply terminal; 5 - Heat exchanger; 6 - Photovoltaic device; 7 - Battery; 8 - Solid heat accumulator; 9 - Second circulation pump; 10 - Heat pump; 11 - Third circulation pump; 12 - First switch; 13 - Second switch; 14 - Third switch; 15 - Fourth switch; 16 - Fifth switch; 210 - First circulation pipeline; 220 - Second circulation pipeline; 230 - Third circulation pipeline; 300 - Heat consumption terminal. Detailed implementation manners

[0019] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0020] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0021] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly stated in the context, it should be understood as "one or more".

[0022] In view of the problems existing in the above related technologies, this embodiment provides a geothermal-valley electricity-solar multi-energy collaborative heating system.

[0023] As Figure 1As shown in the figure, a geothermal-valley electricity-solar multi-energy collaborative heating system provided by an embodiment of the present invention includes a geothermal well 1, a first circulation pipeline 210, a heat exchanger 5, a first circulation pump 3, and a valley-section power supply end 4. The geothermal well 1 is connected to the geothermal end of the heat exchanger 5 through the first circulation pipeline 210. The user end of the heat exchanger 5 is used to be connected to a heat-using terminal 300 for heating the heat-using terminal 300. The first circulation pump 3 is arranged on the first circulation pipeline, and the valley-section power supply end 4 is electrically connected to the first circulation pump 3.

[0024] Specifically, the geothermal well 1 can adopt a medium-deep geothermal well. The geothermal well 1 can include a buried pipe, and the buried pipe can be inserted into the underground rock and soil mass in a fixed manner. The buried pipe can include an inner pipe and an annular cavity. The annular cavity can be arranged around the inner pipe, and the bottom end of the annular cavity is connected to the inner pipe. The annular cavity contacts the underground rock and soil mass. The first circulation pipeline 210 includes a first water inlet pipe and a first water return pipe. The two ends of the first water inlet pipe are respectively correspondingly connected to the annular cavity of the geothermal well 1 and the cold water outlet of the geothermal end of the heat exchanger, so that the low-temperature fluid coming out of the cold water outlet of the heat exchanger 5 enters the annular cavity of the geothermal well 1 along the first water inlet pipe under the suction action of the first circulation pump 3. The low-temperature fluid in the annular cavity exchanges heat with the underground rock and soil mass to obtain heated geothermal fluid. Subsequently, the heated geothermal fluid can be output from the inner pipe of the geothermal well 1. The two ends of the first water return pipe are respectively correspondingly connected to the inner pipe of the geothermal well 1 and the hot water inlet of the geothermal end of the heat exchanger 5, so that the geothermal fluid output from the inner pipe of the geothermal well 1 is transported along the first water return pipe to the geothermal end of the heat exchanger 5. In other words, the heat exchanger 5 can be used to circulate the geothermal fluid output from the geothermal well 1 along the first circulation pipeline 210 under the driving action of the first circulation pump 3 and exchange heat.

[0025] The heat exchanger 5 can adopt a plate heat exchanger, which is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape; thin rectangular channels are formed between various plate sheets, and heat exchange is carried out through the plate sheets. The geothermal end of the heat exchanger 5 refers to the end where the heat exchanger 5 is connected to the geothermal well 1, and the user end of the heat exchanger 5 refers to the end where the heat exchanger 5 is connected to the heat-using terminal 300.

[0026] The valley-section power supply end 4 refers to the power grid with a valley-section electricity price at night, and the time period corresponding to the valley-section electricity price can be from 23:00 to 7:00 the next day.

[0027] The first circulation pump 3 is used to drive the geothermal fluid provided by the geothermal well 1 to circulate in the first circulation pipeline 210 between the geothermal well 1 and the heat exchanger 5. In other words, it provides circulating power for the circulating flow of the geothermal fluid.

[0028] The heat-using terminal 300 can correspond to the user's floor heating equipment or can also correspond to household appliances that require hot water for the user, such as a water heater.

[0029] In this embodiment, during the night stage of the heating season, the valley-section power supply terminal 4 can be electrically connected to the first circulation pump 3 to provide power for the operation of the first circulation pump 3. Since the geothermal well is connected to the geothermal end of the heat exchanger through the first circulation pipeline, and the first circulation pump is arranged on the first circulation pipeline, the geothermal fluid output from the geothermal well is driven by the first circulation pump to enter the geothermal end of the heat exchanger along the first circulation pipeline, so that the geothermal end of the heat exchanger absorbs geothermal energy. Since the user end of the heat exchanger is connected to the user terminal, the geothermal energy at the geothermal end of the heat exchanger is used to heat the fluid at the user end of the heat exchanger to form hot water and deliver it to the heat-using terminal. Among them, the valley-section power supply terminal refers to the power grid in the valley-section of the electricity price at night. In other words, the geothermal energy corresponding to the geothermal well can be heat-exchanged with the water flow at the user end of the heat exchanger through the heat exchanger, and cooperate with the low-cost electric energy corresponding to the valley-section power supply terminal that drives the first circulation pump to work. On the basis of providing stable hot water (or heat energy) for the heat-using terminal, it not only reduces the electricity cost of heating the low-temperature water to the hot water required by the heat-using terminal, but also reduces the power supply load of the power grid.

[0030] Optionally, as Figure 1 and Figure 7 shown, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a phase change heat accumulator 2, and the phase change heat accumulator 2 is connected between the heat exchanger 5 and the heat-using terminal 300.

[0031] Specifically, the user end of the heat exchanger 5 exchanges heat with the water flow circulating between the heat exchanger 5 and the heat-using terminal 300, and the heat energy of the hot water after heat exchange can be stored in the phase change heat accumulator 2.

[0032] The phase change heat accumulator 2 can be made of a low-temperature phase change material and can store heat below 100 °C. Therefore, it can be used to store the heat energy of the geothermal fluid output from the inner pipe of the geothermal well 1 after passing through the heat exchanger 5.

[0033] The hot water delivered from the phase change heat accumulator 2 to the heat-using terminal 300 can be used as the heat source for the user's floor heating or as the user's daily water.

[0034] In this optional embodiment, since the first circulation pipeline 210 is connected to the geothermal end of the heat exchanger 5, the user end of the heat exchanger 5 is connected to the heat-using terminal 300 through the phase change heat accumulator 2. Thus, the heat exchanger 5 can effectively isolate impurities (such as sediment, minerals, corrosive ions or microorganisms) in the hot water output from the geothermal well 1, which can not only protect the equipment of the phase change heat accumulator 2 and the heat-using terminal 300, but also maximize the heat obtained from the geothermal fluid output from the geothermal well 1 to the first circulation pipeline 210.

[0035] Furthermore, during the later repair stage, the heat exchanger 5 can separate the geothermal well 1 set at the geothermal end of the heat exchanger 5 from the heat-using terminal 300 set at the user end of the heat exchanger 5, improving the convenience of maintenance.

[0036] Optionally, as Figure 2 shown, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a photovoltaic device 6, a storage battery 7, and a solid heat accumulator 8. The photovoltaic device 6 is electrically connected to the storage battery 7. The solid heat accumulator 8 includes a heat accumulator main body and a heater. The storage battery 7 is electrically connected to the heater. The heater is connected to the heat accumulator main body and is used to heat the heat accumulator main body. The heat accumulator main body is communicated with the heat-using terminal 300 and is used to supply heat to the heat-using terminal 300.

[0037] Specifically, the photovoltaic device 6 is a photovoltaic module. The photovoltaic device 6 is electrically connected to the storage battery 7 and is used to store the electric energy converted from solar energy in the storage battery 7.

[0038] The solid heat accumulator 8 can be made of materials such as concrete and rock and can be used to store heat sources above 200°C.

[0039] The solid heat accumulator 8 can adopt the following structure. The solid heat accumulator 8 includes a heat accumulator main body and a heater. The heater can be fixed inside the heat accumulator main body or on the outer wall of the heat accumulator main body and is used to heat the inside of the heat accumulator main body.

[0040] In this optional embodiment, during the daytime stage of the heating season, the photovoltaic device 6 converts solar energy into electric energy and stores it in the storage battery 7. The storage battery 7 provides a working power supply for the heater, so that the heater heats the heat accumulator main body when powered on to form a high-temperature heat source and stores it in the heat accumulator main body. The heat energy of the solid heat accumulator 8 after heating can be used to supply the heat-using terminal 300.

[0041] Optionally, as Figure 2 and Figure 7 shown, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a second circulation pipeline 220 and a second circulation pump 9. The solid heat accumulator 8 is communicated with the heat-using terminal 300 through the second circulation pipeline 220. The second circulation pump 9 is arranged on the second circulation pipeline 220.

[0042] Specifically, the storage battery 7 can be electrically connected to the second circulation pump 9 to supply power to the second circulation pump 9.

[0043] The second circulation pipeline 220 may include a second water inlet pipe and a second water return pipe. The heat accumulator body has a first water inlet and a first water outlet. One end of the second water inlet pipe may be communicated with the water inlet interface of the heat-using terminal 300, and the other end of the second water inlet pipe is communicated with the first water outlet of the heat accumulator body. One end of the second water return pipe is communicated with the water return interface of the heat-using terminal 300, and the other end of the second water return pipe is communicated with the first water inlet of the heat accumulator body; a second circulation pump 9 is arranged on the second water return pipe and communicated with the second water return pipe, and is used for driving the fluid to circulate between the heat-using terminal 300 and the solid heat accumulator 8.

[0044] In this optional embodiment, the second circulation pump 9 is arranged on the second water return pipe of the second circulation pipeline 220, so that the low-temperature water flow coming out of the heat-using terminal 300 can enter the heat accumulator body along the second water return pipe under the suction of the second circulation pump 9; the storage battery 7 provides the working power supply for the heater, so that the heat generated by the heater when powered on can heat the low-temperature water flow entering the heat accumulator body into hot water. Subsequently, during the day or night stage of the heating season, the heated hot water in the heat accumulator body can be transported to the heat-using terminal 300 through the second water inlet pipe of the second circulation pipeline 220. Briefly, through the cooperation of the solar energy corresponding to the photovoltaic device 6, the valley-section electric energy corresponding to the valley-section power supply end 4, and the geothermal energy corresponding to the geothermal well 1, not only the surplus renewable energy is effectively utilized, but also the stability and efficiency of heating in the heating season (winter) are enhanced, realizing the optimal allocation and seasonal adjustment of energy.

[0045] Optionally, in combination with Figure 2 、 Figure 3 and Figure 7 as shown, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a first switch 12 and a heat pump 10. The first switch 12 is arranged on the pipeline between the phase change heat accumulator 2 and the heat-using terminal 300, and is used for controlling the connection or disconnection between the phase change heat accumulator 2 and the heat-using terminal 300; The heat pump 10 has a geothermal side and a user side. The geothermal side of the heat pump 10 is connected in series to the first circulation pipeline 210 between the inlet of the geothermal well 1 and the outlet of the heat exchanger 5; the user side of the heat pump is communicated with the heat-using terminal 300, and the user side of the heat pump is used for heating the heat-using terminal 300, and the storage battery 7 is electrically connected to the heat pump 10.

[0046] Specifically, in combination with Figure 2 as shown, the phase change heat accumulator 2 may have a water inlet port and a water outlet port; when the number of the first switches 12 is two (see Figure 2 as shown), they can be arranged at the water inlet port and the water outlet port.

[0047] When heat energy output from the phase change heat accumulator 2 is required, the pipeline between the phase change heat accumulator 2 and the heat-using terminal 300 can be connected by operating the first switch 12, and the phase change heat accumulator 2 can be turned on, so that the phase change heat accumulator 2 can store heat and output heat energy normally.

[0048] Furthermore, as shown in Figure 1 the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a second switch 13, which can be arranged on the pipeline between the heat exchanger 5 and the phase change heat accumulator 2 to control the connection or disconnection between the heat exchanger 5 and the phase change heat accumulator 2.

[0049] After the heat exchanger 5 exchanges heat from the geothermal well 1, the pipeline between the phase change heat accumulator 2 and the heat exchanger 5 can be connected by operating the second switch 13 to be turned on, so that the heat exchanged by the heat exchanger 5 can be transmitted to the phase change heat accumulator 2 for storage through the second switch 13. Correspondingly, the fluid between the heat-using terminal and the heat exchanger 5 can continuously exchange heat to ensure that the heat-using terminal can continuously obtain hot water.

[0050] When the heat energy output from the phase change heat accumulator 2 is insufficient to meet the demand of the heat-using terminal 300, the first switch 12 can be turned off to control the disconnection (i.e., turn off) between the phase change heat accumulator 2 and the heat-using terminal 300, so that the phase change heat accumulator 2 exits the operation relative to the output end of the heat-using terminal 300. Furthermore, the second switch 13 can be turned off to control the disconnection (i.e., turn off) of the pipeline between the phase change heat accumulator 2 and the heat exchanger 5, so that the phase change heat accumulator 2 exits the operation relative to the input end of the heat exchanger 5.

[0051] The geothermal side of the heat pump 10 can be connected in series to the first circulation pipeline 210 between the inlet of the geothermal well 1 and the outlet of the geothermal end of the heat exchanger 5, and the user side of the heat pump 10 is in heat supply connection with the heat-using terminal 300 for supplying heat to the heat-using terminal 300.

[0052] The storage battery 7 is electrically connected to the heat pump 10 to provide a working power supply for the heat pump 10.

[0053] In this optional embodiment, when the heat energy output by the phase change heat accumulator 2 is insufficient to meet the demand of the heat-using terminal 300, the first switch 12 can be operated to control the closing (i.e., shutting off) between the phase change heat accumulator 2 and the heat-using terminal 300, and the second switch 13 can be operated to control the closing (i.e., shutting off) of the pipeline between the phase change heat accumulator 2 and the heat exchanger 5, so as to withdraw the entire phase change heat accumulator 2. At this time, the geothermal fluid with a certain amount of heat can be output through the inner pipe of the geothermal well 1 and flow into the geothermal end of the heat exchanger 5 for heat exchange; the geothermal side of the heat pump 10 is connected in series to the first circulation pipeline 210 between the inlet of the geothermal well 1 and the outlet of the heat exchanger 5, so that the geothermal fluid after heat exchange in the heat exchanger 5 enters the heat pump 10 for temperature rise. The heat after the temperature rise of the heat pump 10 and the heat energy after heat exchange at the user end of the heat exchanger 5 are absorbed by the circulating medium between the heat exchanger 5 and the heat-using terminal 300 to form hot water at a higher temperature. Finally, the hot water can be supplied to the heat-using terminal 300, and the water flow cooled after being used by the heat-using terminal 300 exchanges heat again with the user end of the heat exchanger 5 and the heat of the heat pump, so that the water flow coming out of the heat-using terminal 300 is heated and raised in temperature again, and this process circulates continuously, so as to continuously provide heat energy (hot water) to the heat-using terminal 300. Moreover, since the heat energy after heat exchange in the heat exchanger 5 enters the heat pump 10, the temperature of the heat energy output by the heat pump can be increased, correspondingly increasing the temperature of the hot water at the user end of the heat exchanger 5 and correspondingly expanding the demand range of the heat-using terminal 300 for hot water.

[0054] Optionally, as shown in Figure 2 、 Figure 3 and Figure 7 , the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a third switch 14, which is arranged on the pipeline between the heat accumulator main body and the heat-using terminal 300 and is used to control the connection or closing between the heat accumulator main body and the heat-using terminal 300.

[0055] Specifically, the solid heat accumulator 8 can have a water inlet port and a water outlet port; the number of the third switches 14 can be two, which can be arranged at the water inlet port and the water outlet port.

[0056] As shown in Figure 2 , the third switch 14 is arranged on the pipeline between the heat accumulator main body and the heat-using terminal 300.

[0057] When it is necessary to output heat energy from the solid heat accumulator 8, the third switch 14 can be operated to control the connection between the heat accumulator main body and the heat-using terminal 300, and the solid heat accumulator 8 is turned on, so that the solid heat accumulator 8 can store heat and output heat energy normally. When the heat energy output by the solid heat accumulator 8 is insufficient to meet the demand of the heat-using terminal 300, the third switch 14 can be operated to control the disconnection between the heat accumulator main body and the heat-using terminal 300, so that the solid heat accumulator 8 exits the operation.

[0058] In this alternative embodiment, when the heat energy output by the phase change heat accumulator 2 is insufficient to meet the demand of the heat-using terminal 300, the first switch 12 can be operated to control the disconnection between the phase change heat accumulator 2 and the heat-using terminal 300, and the second switch 13 can be operated to control the closing (i.e., shutting off) of the pipeline between the phase change heat accumulator 2 and the heat exchanger 5, so that the entire phase change heat accumulator 2 exits the operation; and / or, when the heat energy output by the solid heat accumulator 8 is insufficient to meet the demand of the heat-using terminal 300, the third switch 14 can be operated to control the disconnection between the heat accumulator main body and the heat-using terminal 300, so that the solid heat accumulator 8 exits the operation; subsequently, geothermal fluid with a certain amount of heat can be output through the inner pipe of the geothermal well 1 and flow into the heat exchanger 5 along the first return water pipe of the first circulation pipeline 210 for heat exchange. Subsequently, the heat-exchanged geothermal fluid enters the heat pump 10 for heating up. Subsequently, the geothermal fluid heated by the heat pump 10 can flow back to the geothermal well 1 along the first water inlet pipe of the first circulation pipeline 210 for storage; finally, the heat energy after heat exchange in the heat exchanger 5 and the heat energy after heating up by the heat pump 10 are aggregated and flow to the heat-using terminal 300. The low-temperature water flow after being used by the heat-using terminal 300 flows into the heat pump 10 again for heating, and this process circulates continuously, so as to not only continuously provide heat energy (hot water) to the heat-using terminal 300, but also relatively accurately control the temperature of the hot water through the heat pump.

[0059] During the heating season, the operation mode of the geothermal-valley electricity-solar multi-energy collaborative heating system can be dynamically adjusted according to the energy supply conditions. The heat source is preferentially provided by the geothermal well and the electricity of the photovoltaic device, and at the same time, the heat pump and the valley-section power supply end are used as auxiliary energy sources to realize the cascaded heat storage function, so as to efficiently meet the heat energy demand of users.

[0060] Optionally, as shown in Figure 4 and Figure 7 the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a fourth switch 15 and a heat pump 10. The fourth switch 15 is arranged on the pipeline between the geothermal well 1 and the heat exchanger 5 and is used to control the connection or disconnection between the geothermal well 1 and the heat exchanger 5; The heat pump 10 has a geothermal side and a user side. The geothermal side of the heat pump 10 is connected to the geothermal well 1, and the user side of the heat pump 10 is connected to the heat-using terminal 300. The storage battery 7 is electrically connected to the heat pump 10.

[0061] Specifically, the heat pump 10 is a device that transfers the thermal energy of a low-temperature heat source to a high-temperature heat source.

[0062] The storage battery 7 is electrically connected to the heat pump 10, and the storage battery 7 can provide power for the operation of the heat pump 10.

[0063] Combined with Figure 7 As shown, the fourth switch 15 is arranged on the pipeline between the geothermal well 1 and the geothermal end of the heat exchanger 5; the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a fifth switch 16, and the fifth switch 16 is arranged on the pipeline between the user end of the heat exchanger 5 and the heat-using terminal 300.

[0064] In this alternative embodiment, when extreme weather occurs during the heating season, the valley-section power supply end 4 and the photovoltaic device 6 may not work properly. Then, the fourth switch 15 can be operated to turn off, so that the pipeline between the geothermal well 1 and the geothermal end of the heat exchanger 5 is closed to withdraw the geothermal end of the heat exchanger 5 from operation; the fifth switch 16 can be operated to turn off, so that the pipeline between the user end of the heat exchanger 5 and the heat-using terminal 300 is closed to withdraw the user end of the heat exchanger 5 from operation. The thermal energy of the geothermal well 1 can be utilized. For example, the inner pipe of the geothermal well 1 outputs geothermal fluid at a certain temperature, which is transported to the geothermal side of the heat pump 10 along the first circulation pipeline under the suction of the first circulation pump 3, so that the geothermal side of the heat pump 10 absorbs the thermal energy of the geothermal fluid in the geothermal well 1, and the heat pump 10 heats the water flow on the user side of the heat pump 10 by means of heat exchange and transports it to the heat-using terminal 300, thereby realizing the heating operation when extreme weather occurs during the heating season.

[0065] Optionally, combined with Figure 5 and Figure 7 As shown, the geothermal-valley electricity-solar multi-energy collaborative heating system further includes a third circulation pipeline 230 and a third circulation pump 11. The solid heat accumulator 8 and the phase change heat accumulator 2 are connected through the third circulation pipeline 230, and the third circulation pump 11 is arranged on the third circulation pipeline 230.

[0066] Specifically, the solid heat accumulator 8 and the phase change heat accumulator 2 are connected through the third circulation pipeline 230, so that the solid heat accumulator 8 and the phase change heat accumulator 2 are connected in series; the phase change heat accumulator 2 is connected to the heat-using terminal 300, so that the solid heat accumulator 8, the phase change heat accumulator 2 and the heat-using terminal 300 are connected in series and in sequence.

[0067] In this alternative embodiment, during the daytime in the non - heating season, the photovoltaic device 6 operates to convert solar energy into electrical energy and store it in the storage battery 7. Subsequently, the storage battery 7 supplies power to the solid heat accumulator 8 for heating, generating heat and storing it in the solid heat accumulator 8. Then, through the series - connected phase - change heat accumulator 2, the remaining heat is circulated under the suction of the third circulation pump 11 through a heat transfer medium such as water flow along the third circulation pipeline 230 and further stored by the phase - change heat accumulator 2 to achieve cascaded heat storage. When the heat - using terminal 300 needs hot water, the second circulation pump 9 can drive the heat energy of the phase - change heat accumulator 2 to be transferred to the heat - using terminal 300, thus meeting the domestic hot water demand of the heat - using terminal 300.

[0068] During the non - heating season, the geothermal - valley electricity - solar multi - energy collaborative heating system makes full use of the photovoltaic device 6 (light resource) to supplement heat to the geothermal well, achieving the goal of cross - seasonal energy storage. At the same time, the storage battery is used to assist the photovoltaic device 6 in generating electricity to ensure the supply of heat - using terminals such as domestic hot water, thus constructing an efficient and sustainable energy utilization system.

[0069] Optionally, as shown in Figure 6 and Figure 7 the geothermal - valley electricity - solar multi - energy collaborative heating system further includes a storage battery 7 and a solid heat accumulator 8. The valley - section power supply end 4 is electrically connected to the storage battery 7, and the storage battery 7 is electrically connected to the solid heat accumulator 8; The user end of the heat exchanger 5 is communicated with the solid heat accumulator 8.

[0070] Specifically, during the night in the non - heating season, the valley - section power supply end 4 is electrically connected to the storage battery 7 to charge the storage battery 7 during the off - peak period of the electricity price at night through the valley - section power supply end 4, effectively saving electricity costs. Subsequently, the storage battery 7 provides power for the heater of the solid heat accumulator 8, so that the heater generates heat energy when powered on and stores it in the solid heat accumulator 8.

[0071] Since the geothermal well 1 is communicated with the geothermal end of the heat exchanger 5 through the first circulation pipeline 210, and the user end of the heat exchanger 5 is communicated with the solid heat accumulator 8, so that the heat energy (such as hot water) of the solid heat accumulator 8 can flow to the user end of the heat exchanger 5. At this time, the heat energy at the user end of the heat exchanger 5 is higher than that at the geothermal end of the heat exchanger 5. Subsequently, the geothermal end of the heat exchanger 5 absorbs the heat energy transferred from the solid heat accumulator 8 by means of heat exchange and is transported along the first circulation pipeline 210 to the geothermal well 1 for storage under the suction of the first circulation pump 3 to achieve cross - seasonal heat storage operation.

[0072] Optionally, as shown in Figure 6 and Figure 7As shown, the geothermal-valley electricity-solar multi-energy collaborative heating system includes two first circulation pumps 3, and a first circulation pump 3 is respectively arranged on the pipeline between the geothermal well 1 and the heat exchanger 5, and on the pipeline between the heat exchanger 5 and the heat-using terminal 300.

[0073] Specifically, the number of the first circulation pumps 3 is at least two. For example, Figure 1 in [a specific example], the number of the first circulation pumps 3 is two, which are respectively arranged on the pipeline between the geothermal end of the geothermal well 1 and the heat exchanger 5 and on the pipeline between the user end of the heat exchanger 5 and the heat-using terminal 300.

[0074] In this optional embodiment, since the geothermal well 1 is connected to the geothermal end of the heat exchanger 5 through the first circulation pipeline, the first circulation pump 3 is arranged on the pipeline between the geothermal well 1 and the heat exchanger 5 to enable the heat energy between the geothermal well 1 and the geothermal end of the heat exchanger to flow and transfer along the first circulation pipeline 210 through the first circulation pump 3.

[0075] The user end of the heat exchanger 5 is connected to the heat-using terminal 300, and another first circulation pump 3 is arranged on the pipeline between the user end of the heat exchanger 5 and the heat-using terminal 300 to enable the heat transfer between the user end of the heat exchanger 5 and the heat-using terminal 300 through the other first circulation pump 3.

[0076] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Without departing from the spirit and scope of the present invention, those skilled in the art can make various changes and modifications, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A geothermal-valley electricity-solar multi-energy collaborative heating system, characterized in that, It includes a geothermal well (1), a first circulation pipeline (210), a heat exchanger (5), a first circulation pump (3), and a valley-section power supply terminal (4). The geothermal well (1) is communicated with the geothermal end of the heat exchanger (5) through the first circulation pipeline (210). The user end of the heat exchanger (5) is used to be communicated with a heat-using terminal (300) for heating the heat-using terminal (300). The first circulation pump (3) is arranged on the first circulation pipeline, and the valley-section power supply terminal (4) is electrically connected to the first circulation pump (3).

2. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 1, wherein It further includes a phase-change heat accumulator (2), and the phase-change heat accumulator (2) is connected between the heat exchanger (5) and the heat-using terminal (300).

3. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 2, wherein It further includes a photovoltaic device (6), a storage battery (7), and a solid heat accumulator (8). The photovoltaic device (6) is electrically connected to the storage battery (7). The solid heat accumulator (8) includes a heat accumulator main body and a heater. The storage battery (7) is electrically connected to the heater, and the heater is connected to the heat accumulator main body for heating the heat accumulator main body. The heat accumulator main body is communicated with the heat-using terminal (300) for heating the heat-using terminal (300).

4. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 3, characterized in that, It further includes a second circulation pipeline (220) and a second circulation pump (9). The solid heat accumulator (8) is communicated with the heat-using terminal (300) through the second circulation pipeline (220), and the second circulation pump (9) is arranged on the second circulation pipeline (220).

5. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 3, characterized in that, It further includes a first switch (12) and a heat pump (10). The first switch (12) is arranged on the pipeline between the phase-change heat accumulator (2) and the heat-using terminal (300) for controlling the connection or disconnection between the phase-change heat accumulator (2) and the heat-using terminal (300). The heat pump (10) has a geothermal side and a user side. The geothermal side of the heat pump (10) is connected in series to the first circulation pipeline (210) between the inlet of the geothermal well (1) and the outlet of the heat exchanger (5). The user side of the heat pump is communicated with the heat-using terminal (300), and the user side of the heat pump is used to heat the heat-using terminal (300). The storage battery (7) is electrically connected to the heat pump (10).

6. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 5, characterized in that, It further includes a third switch (14). The third switch (14) is arranged on the pipeline between the heat accumulator main body and the heat-using terminal (300) for controlling the connection or disconnection between the heat accumulator main body and the heat-using terminal (300).

7. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 3, wherein It further includes a fourth switch (15) and a heat pump (10). The fourth switch (15) is arranged on the pipeline between the geothermal well (1) and the heat exchanger (5) for controlling the connection or disconnection between the geothermal well (1) and the heat exchanger (5). The heat pump (10) has a geothermal side and a user side. The geothermal side of the heat pump (10) is communicated with the geothermal well (1), and the user side of the heat pump (10) is communicated with the heat-using terminal (300). The storage battery (7) is electrically connected to the heat pump (10).

8. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 3, characterized in that, It further includes a third circulation pipeline (230) and a third circulation pump (11). The solid heat accumulator (8) and the phase change heat accumulator (2) are communicated through the third circulation pipeline (230), and the third circulation pump (11) is arranged on the third circulation pipeline (230).

9. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 1, characterized in that, It further includes a storage battery (7) and a solid heat accumulator (8). The valley-section power supply end (4) is electrically connected to the storage battery (7), and the storage battery (7) is electrically connected to the solid heat accumulator (8). The user end of the heat exchanger (5) is communicated with the solid heat accumulator (8).

10. The geothermal-valley electricity-solar multi-energy collaborative heating system according to claim 1, characterized in that, It includes two first circulation pumps (3). A first circulation pump (3) is respectively arranged on the pipeline between the geothermal well (1) and the heat exchanger (5), and on the pipeline between the heat exchanger (5) and the heat consumption terminal (300).

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