Heat storage and heating system with medium-deep geothermal energy coupled with electric boiler to consume abandoned electricity

Abstract

The utility model belongs to the technical field of renewable energy sources and energy storage and heating, and particularly relates to a heat storage and heating system for consuming abandoned electricity by coupling middle-deep geothermal energy with an electric boiler. The system comprises the middle-deep layer coaxial sleeve geothermal well, the heat pump unit, the electric boiler, the first plate heat exchanger, the heat storage tank, the second plate heat exchanger, the third plate heat exchanger, the water collector and the water segregator, eight loops are formed in total, and different heating requirements under four different working conditions are met. Middle-deep geothermal energy, the electric boiler and an energy storage combined heating system are coupled, renewable geothermal energy is fully utilized, the requirement that the tail end operation water temperature of a building is different in different heating periods is met, the electric boiler energy storage technology is coupled, and wind abandoned light electric power is consumed; on the basis of relieving the pressure of a power grid, clean heating of a building is achieved, and efficient utilization of medium-deep geothermal energy is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of renewable energy and energy storage heating, and specifically relates to a heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler. Background Art

[0002] At present, urban heating energy consumption in northern my country accounts for nearly 20% of the national energy consumption, and most of it is coal-fired. Under the dual carbon goals, the promotion of clean heating is imperative.

[0003] Geothermal energy is a green, low-carbon, recyclable renewable energy source with the characteristics of large reserves, wide distribution, clean and environmentally friendly, stable and reliable. It is a practical and competitive clean energy. The medium-deep coaxial casing geothermal well coupled heat pump utilization system is one of the common technologies, which has the characteristics of no impact on groundwater, small footprint, and stable heating. However, due to the water outlet temperature of the geothermal well and the system limitations, the technology currently has problems such as inflexible supply and return water temperature, low system operation efficiency, and insufficient utilization of medium-deep geothermal water. At present, the technology has not been combined with an energy storage system to absorb abandoned wind and solar power to solve the heating problem. Utility Model Content

[0004] In order to solve the above technical problems, the utility model proposes a heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A heat storage heating system for medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, comprising at least a medium-deep coaxial casing geothermal well; also comprising a heat pump unit, an electric boiler, a first plate heat exchanger, a heat storage tank, a second plate heat exchanger, a third plate heat exchanger, a water collector and a water distributor; the medium-deep coaxial casing geothermal well and the heat pump unit are connected by a pipeline to form a first loop; the output port of the water collector and the cold water input port of the heat pump unit are connected by a pipeline, a second water pump and a third valve are connected to the pipeline, and the second water pump is arranged near the cold water input port of the heat pump unit, the third valve is arranged near the output port of the water collector, the third valve and the second water pump are connected to the cold water inlet of the third plate heat exchanger through a pipeline, and a sixth water pump and a fourteenth valve are connected to the connecting pipeline; the hot water output port of the heat pump unit and the input port of the water distributor are connected by a pipeline, and a fifth valve is connected to the connecting pipeline; the front end of the fifth valve is connected to the hot water input port of the second plate heat exchanger through a pipeline, and the pipeline is connected The fourth valve is connected; the rear end of the fifth valve is connected to the hot water output port of the second plate heat exchanger through a pipeline; the hot water outlet of the third plate heat exchanger is connected to the water distributor through a pipeline connected to the fifteenth valve, the cold water outlet of the third plate heat exchanger is connected to the cold water inlet of the heat storage tank through a pipeline connected to the thirteenth valve, and the hot water inlet of the third plate heat exchanger is connected to the hot water outlet of the heat storage tank through a pipeline connected to the eleventh valve; the water collector, the water distributor and the heat pump unit form a second loop; the heat pump unit, the second The plate heat exchanger, the water collector and the water distributor are connected by pipelines to form a third loop; the electric boiler and the first plate heat exchanger are connected by pipelines to form a fourth loop; the first plate heat exchanger and the heat storage tank are connected by pipelines to form a fifth loop; the heat storage tank and the second plate heat exchanger are connected by pipelines to form a sixth loop; the heat storage tank and the third plate heat exchanger are connected by pipelines to form a seventh loop; the third plate heat exchanger, the water collector and the water distributor are connected by pipelines to form an eighth loop.

[0007] The first circuit includes a first input pipeline, a first output pipeline, a first water pump and a second valve; the first input pipeline is connected to the water outlet of the medium-deep coaxial casing geothermal well and the hot water inlet of the heat pump unit, and the first input pipeline is connected to the first water pump; the first output pipeline is connected to the inlet of the medium-deep coaxial casing geothermal well and the cold water outlet of the heat pump unit, and the first output pipeline is connected to the second valve.

[0008] The second circuit is composed of a water collector, a third valve, a second water pump, a heat pump unit, a fifth valve and a water distributor; the water collector is connected to the water distributor through the third valve, the second water pump, the heat pump unit and the fifth valve in sequence; the fifth valve is used to control the on-off of the connecting pipeline between the input port of the water distributor and the heat pump unit.

[0009] The third loop is composed of a heat pump unit, a second plate heat exchanger, a water collector and a water distributor; the water collector is connected to the water distributor through the third valve, the second water pump, the heat pump unit, the fourth valve, the second plate heat exchanger in sequence.

[0010] The fourth loop at least includes a second input pipeline, a second output pipeline, a third water pump, a sixth valve and a seventh valve; the two ends of the second input pipeline are respectively connected to the cold water output end of the first plate heat exchanger and the input end of the electric boiler, and the second input pipeline is connected to the third water pump and the seventh valve; the two ends of the second output pipeline are respectively connected to the hot water input end of the first plate heat exchanger and the output end of the electric boiler, and the second output pipeline is connected to the sixth valve; the electric boiler, the sixth valve, the first plate heat exchanger, the third water pump, and the electric boiler are connected in sequence to form a loop.

[0011] The fifth loop at least includes a third input pipeline, a third output pipeline, a fourth water pump, an eighth valve and a ninth valve; the two ends of the third input pipeline are respectively connected to the hot water input end of the first plate heat exchanger and the hot water output end of the heat storage tank; the third input pipeline is connected to the fourth water pump and the ninth valve; the two ends of the third output pipeline are respectively connected to the hot water output end of the first plate heat exchanger and the hot water input end of the heat storage tank; the third output pipeline is connected to the eighth valve; the primary side return water of the heat storage tank is connected to the heat storage tank via the ninth valve, the fourth water pump, the first plate heat exchanger and the eighth valve in sequence.

[0012] The sixth circuit at least includes a fourth input pipeline, a fourth output pipeline, a fifth water pump, a tenth valve and a twelfth valve; the two ends of the fourth input pipeline are respectively connected to the cold water input end of the heat storage tank and the cold water input and output ends of the second plate heat exchanger, and the fourth input pipeline is connected to the twelfth valve and the fifth water pump; the two ends of the fourth output pipeline are respectively connected to the hot water output end of the heat storage tank and the hot water input end of the second plate heat exchanger, and the fourth output pipeline is connected to the tenth valve; the secondary side water supply of the heat storage tank is returned to the heat storage tank through the tenth valve, the second plate heat exchanger and the fifth water pump in sequence; the rear end of the fifth water pump and the front end of the tenth valve are respectively connected to the third plate heat exchanger through pipelines.

[0013] The seventh loop is the secondary side water supply of the heat storage tank, which returns to the heat storage tank through the eleventh valve, the third plate heat exchanger, and the thirteenth valve in sequence.

[0014] The eighth loop is from the water collector to the water distributor via the sixth water pump, the third plate heat exchanger, and the fifteenth valve.

[0015] Beneficial effects:

[0016] (1) The utility model makes full use of renewable geothermal energy through the coupling of medium-deep geothermal energy, electric boilers and energy storage systems, and meets the requirements of different terminal operating water temperatures in different heating periods of the building.

[0017] (2) The utility model couples the electric boiler energy storage technology to absorb abandoned wind and solar power. On the basis of alleviating the pressure on the power grid, it not only realizes the clean heating of buildings, but also realizes the efficient utilization of medium and deep geothermal energy.

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] In the figure: 1. Medium-deep coaxial casing geothermal well; 2. Heat pump unit; 3. Electric boiler; 4. First plate heat exchanger; 5. Heat storage tank; 6. Second plate heat exchanger; 7. Third plate heat exchanger; 8. Water collector; 9. Water distributor; 10. First water pump; 11. Second water pump; 12. Third water pump; 13. Fourth water pump; 14. Fifth water pump; 15. Sixth water pump; 16. First valve; 17. Second valve; 18. Third valve; 19. Fourth valve; 20. Fifth valve; 21. Sixth valve; 22. Seventh valve; 23. Eighth valve; 24. Ninth valve; 25. Tenth valve; 26. Eleventh valve; 27. Twelfth valve; 28. Thirteenth valve; 29. ​​Fourteenth valve; 30. Fifteenth valve.

[0022] in:

[0023] T1 is the water temperature of the heat pump unit entering the ground source side; T2 is the water temperature of the heat pump unit exiting the ground source side; T3 is the water temperature of the heat pump unit entering the load side; T4 is the water temperature of the heat pump unit exiting the load side; T5 is the return water temperature of the heat user; T6 is the water supply temperature of the heat user; T7 is the boiler supply water temperature; T8 is the boiler return water temperature; T9 is the supply water temperature of the first plate heat exchanger; T10 is the return water temperature of the first plate heat exchanger; T11 is the supply water temperature of the heat storage tank; T12 is the return water temperature of the heat storage tank; T13 is the return water temperature of the second plate heat exchanger; T14 is the supply water temperature of the second plate heat exchanger; T15 is the return water temperature of the third plate heat exchanger; T16 is the supply water temperature of the third plate heat exchanger. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment 1:

[0026] according to Figure 1A heat storage heating system for medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity is shown, comprising at least a medium-deep coaxial casing geothermal well 1; a heat pump unit 2, an electric boiler 3, a first plate heat exchanger 4, a heat storage tank 5, a second plate heat exchanger 6, a third plate heat exchanger 7 and a water collector 8; the medium-deep coaxial casing geothermal well 1 is connected to the heat pump unit 2 by a pipeline to form a first loop; the output port of the water collector 8 and the cold water input port of the heat pump unit 2 are connected by a pipeline, the pipeline is connected to a second water pump 11 and a third valve 18, and the second water The pump 11 is arranged near the cold water input port of the heat pump unit 2, and the third valve 18 is arranged near the output port of the water collector 8. The third valve 18 and the second water pump 11 are connected to the cold water inlet of the third plate heat exchanger 7 through a pipeline, and the sixth water pump 15 and the fourteenth valve 29 are connected to the connecting pipeline; the hot water output port of the heat pump unit 2 is connected to the input port of the water distributor 9 through a pipeline, and the fifth valve 20 is connected to the connecting pipeline; the front end of the fifth valve 20 is connected to the hot water input port of the second plate heat exchanger 6 through a pipeline, and the pipeline is connected A fourth valve 19 is connected; the rear end of the fifth valve 20 is connected to the hot water output port of the second plate heat exchanger 6 through a pipeline; the hot water outlet of the third plate heat exchanger 7 is connected to the water distributor 9 through a pipeline connected to the fifteenth valve 30, the cold water outlet of the third plate heat exchanger 7 is connected to the cold water inlet of the heat storage tank 5 through a pipeline connected to the thirteenth valve 28, and the hot water inlet of the third plate heat exchanger 7 is connected to the hot water outlet of the heat storage tank 5 through a pipeline connected to the eleventh valve 26; the water collector 8, the water distributor 9 and the heat pump unit 2 form a second loop; the heat pump unit 2. The second plate heat exchanger 6, the water collector 8 and the water distributor 9 are connected by pipelines to form a third loop; the electric boiler 3 and the first plate heat exchanger 4 are connected by pipelines to form a fourth loop; the first plate heat exchanger 4 and the heat storage tank 5 are connected by pipelines to form a fifth loop; the heat storage tank 5 and the second plate heat exchanger 6 are connected by pipelines to form a sixth loop; the heat storage tank 5 and the third plate heat exchanger 7 are connected by pipelines to form a seventh loop; the third plate heat exchanger 7, the water collector 8 and the water distributor 9 are connected by pipelines to form an eighth loop.

[0027] In actual use, the heating working conditions of the utility model are divided into the following four types:

[0028] (1) Medium-deep geothermal well coupled with heat pump heating, electric boiler and heat storage tank heat storage conditions

[0029] Under this operating condition, the first circuit, the second circuit, the fourth circuit and the fifth circuit are in operation, and the other circuits are closed; at this time, the medium-deep coaxial casing geothermal well 1, the heat pump unit 2, the electric boiler 3, the first plate heat exchanger 4, the heat storage tank 5 and the first water pump 10, the second water pump 11, the third water pump 12, and the fourth water pump 13 in the first circuit, the second circuit, the fourth circuit, and the fifth circuit are opened, the first valve 16, the second valve 17, the third valve 18, the fifth valve 20, the sixth valve 21, the seventh valve 22, the eighth valve 23, and the ninth valve 24 are opened, and the others are closed.

[0030] This operating condition is applicable to the early and late stages of the heating season, when the heat load is small, the building requires a low water supply temperature, and there is sufficient wind and solar power or during the off-peak hours at night.

[0031] (2) Heating conditions of medium-deep geothermal wells coupled with heat pump units and heat storage tanks

[0032] Under this operating condition, the first circuit, the second circuit, the seventh circuit and the eighth circuit are in operation, and the other circuits are closed; at this time, the medium-deep coaxial casing geothermal well 1, the heat pump unit 2, the heat storage tank 5, the third plate heat exchanger 7 and the first water pump 10, the second water pump 11, the fifth water pump 14, and the sixth water pump 15 in the first circuit, the second circuit, the seventh circuit and the eighth circuit are opened, the first valve 16, the second valve 17, the third valve 18, the fifth valve 20, the eleventh valve 26, the thirteenth valve 28, the fourteenth valve 29, and the fifteenth valve 30 are opened, and the others are closed.

[0033] This operating condition is suitable for the early and late stages of the heating season, when the heat load is small, the building requires a low water supply temperature, and it is during peak power hours.

[0034] (3) Medium-deep geothermal wells coupled with heat pump units, electric boilers, and heat storage tanks for combined heating and heat storage conditions

[0035] Under this working condition, the first circuit, the third circuit, the fourth circuit, the fifth circuit, the sixth circuit, the seventh circuit and the eighth circuit are jointly operated, and the second circuit is closed; at this time, the medium-deep coaxial casing geothermal well 1, the heat pump unit 2, the electric boiler 3, the first plate heat exchanger 4, the heat storage tank 5, the second plate heat exchanger 6, the third plate heat exchanger 7 and the first water pump 10, the second water pump 11, the third water pump 12, the fourth water pump 13, the fifth water pump 14, and the sixth water pump 15 in the first circuit, the third circuit, the fourth circuit, the fifth circuit, the sixth circuit, the seventh circuit and the eighth circuit are opened, the first valve 16, the second valve 17, the third valve 18, the fourth valve 19, the sixth valve 21, the seventh valve 22, the eighth valve 23, the ninth valve 24, the tenth valve 25, the eleventh valve 26, the twelfth valve 27, the thirteenth valve 28, the fourteenth valve 29, and the fifteenth valve 30 are opened, and the others are closed.

[0036] This working condition is suitable for the middle of the heating season, when the heat load is large, the building requires a high water supply temperature, and there is sufficient wind and solar power or the off-peak period at night. In this working condition, the heat of the heat storage tank 5 is stored and released at the same time, and the return water at the output end of the water collector 8, that is, the user end, is divided into two paths: one path of the return water enters the heat pump unit 2 to increase the temperature and then enters the second plate heat exchanger 6, and after being heated again by the second plate heat exchanger 6, it is input into the water distributor 9 to supply water to the user; the other path of the return water enters the third plate heat exchanger 7 to increase the temperature and then merge with the water supply of the third circuit for joint heating.

[0037] (4) Medium-deep geothermal well coupled with heat pump unit and heat storage tank combined heating condition

[0038] Under this working condition, the first circuit, the third circuit, the sixth circuit, the seventh circuit and the eighth circuit are jointly operated, and the other circuits are closed; at this time, the medium-deep coaxial casing geothermal well 1, the heat pump unit 2, the heat storage tank 5, the second plate heat exchanger 6, the third plate heat exchanger 7 and the first water pump 10, the second water pump 11, the fifth water pump 14, and the sixth water pump 15 in the first circuit, the third circuit, the sixth circuit, the seventh circuit and the eighth circuit are opened, the first valve 16, the second valve 17, the third valve 18, the fourth valve 19, the tenth valve 25, the eleventh valve 26, the twelfth valve 27, the thirteenth valve 28, the fourteenth valve 29, and the fifteenth valve 30 are opened, and the others are closed.

[0039] This working condition is suitable for the middle of the heating season, when the heat load is large, the building requires a high water supply temperature, and it is during the peak power period. In this working condition, the heat storage tank releases heat, and the return water from the user terminal and the water collector 8 is divided into two paths: one of the return water enters the heat pump unit 2 to increase the temperature, and then enters the second plate heat exchanger 6 to increase the temperature again, and then supplies water to the water distributor 9, that is, the user; the other return water enters the third plate heat exchanger 7 to increase the temperature, and then merges with the third return water supply for joint heating.

[0040] The utility model fully utilizes renewable geothermal energy through the coupling of medium-deep geothermal energy, electric boilers and energy storage systems, and realizes the different terminal operating water temperature requirements of buildings in different heating periods.

[0041] The utility model couples the electric boiler energy storage technology to absorb abandoned wind and solar power, realizes clean heating of buildings on the basis of alleviating the pressure on the power grid, and realizes the efficient utilization of medium and deep geothermal energy.

[0042] Embodiment 2:

[0043] according to Figure 1The heat storage heating system shown in the figure, which uses medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, is different from the first embodiment in that: the first circuit includes a first input pipeline, a first output pipeline, a first water pump 10 and a second valve 17; the first input pipeline is connected to the water outlet of the medium-deep coaxial casing geothermal well 1 and the hot water inlet of the heat pump unit 2, and the first input pipeline is connected to the first water pump 10; the first output pipeline is connected to the inlet of the medium-deep coaxial casing geothermal well 1 and the cold water outlet of the heat pump unit 2, and the first output pipeline is connected to the second valve 17.

[0044] In actual use, the first loop allows the water from the medium-deep coaxial casing geothermal well 1 to enter the heat pump unit 2 after being lifted by the first water pump 10; then, it returns to the medium-deep coaxial casing geothermal well 1 to form a cycle. The water temperature T1 on the ground source side entering the heat pump unit is higher than the water temperature T2 on the ground source side exiting the heat pump unit.

[0045] In this embodiment, the water temperature T1 of the heat pump unit entering the ground source side is 30°C, and the water temperature T2 of the heat pump unit exiting the ground source side is 20°C.

[0046] Embodiment three:

[0047] according to Figure 1 The heat storage heating system shown in the figure, which uses medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, is different from the first embodiment in that: the second circuit is composed of a water collector 8, a third valve 18, a second water pump 11, a heat pump unit 2, a fifth valve 20 and a water distributor 9; the water collector 8 is connected to the water distributor 9 through the third valve 18, the second water pump 11, the heat pump unit 2 and the fifth valve 20 in sequence; the fifth valve 20 is used to control the on-off of the connecting pipeline between the input port of the water distributor 9 and the heat pump unit 2.

[0048] In actual use, in the second loop, the return water at the outlet of the water collector 8, i.e., the end of the heat user, is raised by the second water pump 11 and enters the heat pump unit 2. After the temperature is raised by the heat pump unit 2, it is re-supplied to the heat user through the water distributor 9, forming a cycle. At this time, the water temperature T3 entering the heat pump unit on the load side is the same as the return water temperature T5 of the heat user, and the water temperature T4 exiting the heat pump unit on the load side is the same as the supply water temperature T6 of the heat user, and the return water temperature T5 of the heat user is lower than the supply water temperature T6 of the heat user.

[0049] In this embodiment, the load-side inlet heat pump unit water temperature T3 and the heat user return water temperature T5 are both 40°C, and the load-side outlet heat pump unit water temperature T4 and the heat user supply water temperature T6 are both 50°C.

[0050] Embodiment 4:

[0051] according to Figure 1The heat storage heating system shown in the figure, which uses medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, is different from the first embodiment in that: the third circuit is composed of a heat pump unit 2, a second plate heat exchanger 6, a water collector 8 and a water distributor 9; the water collector 8 is connected to the water distributor 9 through the third valve 18, the second water pump 11, the heat pump unit 2, the fourth valve 19, and the second plate heat exchanger 6 in sequence.

[0052] In actual use, the water outlet end of the water collector 8 in the third loop, i.e., the return water at the user end, is lifted by the second water pump 11 and enters the heat pump unit 2. After the temperature is raised by the heat pump unit 2, it enters the second plate heat exchanger 6 for heat exchange to further increase the temperature, and then enters the water distributor 9 to supply water to the heat user. At this time, the water temperature T4 of the heat pump unit outlet on the load side is the same as the return water temperature T13 of the second plate heat exchanger, the water supply temperature T6 of the heat user is the same as the water supply temperature T14 of the second plate heat exchanger, and the water supply temperature T6 of the heat user and the second plate heat exchanger supply temperature T14 are higher than the water temperature T4 of the heat pump unit outlet on the load side and the second plate heat exchanger return water temperature T13, and the water temperature T4 of the heat pump unit outlet on the load side is higher than the water temperature T3 of the heat pump unit inlet on the load side.

[0053] In this embodiment, the water temperature T3 entering the heat pump unit on the load side is about 40°C, the water temperature T4 exiting the heat pump unit on the load side can reach about 50°C, and the water supply temperature T6 for the heat user can reach about 75°C.

[0054] Embodiment five:

[0055] according to Figure 1 The heat storage heating system shown in the figure for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler is different from the first embodiment in that: the fourth loop at least includes a second input pipeline, a second output pipeline, a third water pump 12, a sixth valve 21 and a seventh valve 22; the two ends of the second input pipeline are respectively connected to the cold water output end of the first plate heat exchanger 4 and the input end of the electric boiler 3, and the second input pipeline is connected to the third water pump 12 and the seventh valve 22; the two ends of the second output pipeline are respectively connected to the hot water input end of the first plate heat exchanger 4 and the output end of the electric boiler 3, and the second output pipeline is connected to the sixth valve 21; the electric boiler 3, the sixth valve 21, the first plate heat exchanger 4, the third water pump 12, and the electric boiler 3 are connected in sequence to form a loop.

[0056] In actual use, the fourth circuit allows the outlet water from the electric boiler 3 to enter the first plate heat exchanger 4 for heat exchange, and then return to the electric boiler 3 through the third water pump 12. At this time, the boiler water supply temperature T7 is higher than the boiler return water temperature T8.

[0057] The boiler water supply temperature in this embodiment can reach about 90°C, and the boiler return water temperature T8 can reach about 70°C.

[0058] Embodiment six:

[0059] according to Figure 1 A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler is shown, which is different from the first embodiment in that: the fifth loop at least includes a third input pipeline, a third output pipeline, a fourth water pump 13, an eighth valve 23 and a ninth valve 24; the two ends of the third input pipeline are respectively connected to the hot water input end of the first plate heat exchanger 4 and the hot water output end of the heat storage tank 5; the fourth water pump 13 and the ninth valve 24 are connected to the third input pipeline; the two ends of the third output pipeline are respectively connected to the hot water output end of the first plate heat exchanger 4 and the hot water input end of the heat storage tank 5; the eighth valve 23 is connected to the third output pipeline; the primary side return water of the heat storage tank 5 is connected to the heat storage tank 5 through the ninth valve 24, the fourth water pump 13, the first plate heat exchanger 4, and the eighth valve 23 in sequence.

[0060] In actual use, the fifth circuit allows the primary side return water of the heat storage tank 5 to pass through the fourth water pump 13, enter the first plate heat exchanger 4 to increase the temperature, and then enter the heat storage tank 5 to store energy; at this time, the first plate heat exchanger water supply temperature T9 is higher than the first plate heat exchanger return water temperature T10.

[0061] In this embodiment, the first plate heat exchanger water supply temperature T9 can reach about 85°C, and the first plate heat exchanger return water temperature T10 can reach about 65°C.

[0062] Embodiment seven:

[0063] according to Figure 1 The heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler shown in the figure is different from the first embodiment in that: the sixth circuit at least includes a fourth input pipeline, a fourth output pipeline, a fifth water pump 14, a tenth valve 25 and a twelfth valve 27; the two ends of the fourth input pipeline are respectively connected to the cold water input end of the heat storage tank 5 and the cold water input and output ends of the second plate heat exchanger 6, and the twelfth valve 27 and the fifth water pump 14 are connected to the fourth input pipeline; the two ends of the fourth output pipeline are respectively connected to the hot water output end of the heat storage tank 5 and the hot water input end of the second plate heat exchanger 6, and the fourth output pipeline is connected to the tenth valve 25; the secondary side water supply of the heat storage tank 5 is returned to the heat storage tank 5 through the tenth valve 25, the second plate heat exchanger 6, and the fifth water pump 14 in sequence; the rear end of the fifth water pump 14 and the front end of the tenth valve 25 are respectively connected to the third plate heat exchanger 7 through pipelines.

[0064] In actual use, the sixth circuit allows the secondary side water supply of the heat storage tank 5 to enter the second plate heat exchanger 6 for heat exchange, and then return to the heat storage tank 5 after being lifted by the fifth water pump 14; at this time, the heat storage tank water supply temperature T11 is higher than the heat storage tank return water temperature T12.

[0065] In this embodiment, the heat storage tank water supply temperature T11 can reach about 85°C, and the heat storage tank return water temperature T12 can reach about 65°C.

[0066] Embodiment eight:

[0067] according to Figure 1 The heat storage heating system shown in the figure, which uses medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, is different from the first embodiment in that: the seventh circuit is the secondary side water supply of the heat storage tank 5, which returns to the heat storage tank 5 through the eleventh valve 26, the third plate heat exchanger 7, and the thirteenth valve 28 in sequence.

[0068] In actual use, the seventh circuit allows the secondary side water supply of the heat storage tank 5 to enter the third plate heat exchanger 7 through the eleventh valve 26 for heat exchange, and then return to the heat storage tank 5 after being lifted by the fifth water pump 14; at this time, the heat storage tank water supply temperature T11 is higher than the heat storage tank return water temperature T12.

[0069] In this embodiment, the heat storage tank water supply temperature T11 can reach about 85°C, and the heat storage tank return water temperature T12 can reach about 65°C.

[0070] Embodiment nine:

[0071] according to Figure 1 The heat storage heating system shown in the figure, which uses medium-deep geothermal energy coupled with an electric boiler to absorb abandoned electricity, is different from the first embodiment in that the eighth circuit is from the water collector 8 to the water distributor 9 via the sixth water pump 15, the third plate heat exchanger 7, and the fifteenth valve 30.

[0072] In actual use, the eighth circuit causes the water to return from the outlet end of the water collector 8, i.e., the user end, and enter the third plate heat exchanger 7 to increase the temperature after being lifted by the sixth water pump 15. Thereafter, water is supplied to the heat user through the water distributor 9 through the fifteenth valve 30. At this time, the heat user return water temperature T5 is lower than the heat user supply water temperature T6, the heat user supply water temperature T6 is the same as the third plate heat exchanger supply water temperature T16, and the heat user return water temperature T5 is the same as the third plate heat exchanger return water temperature T15.

[0073] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0074] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0075] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0076] The above is only a preferred embodiment of the utility model. The utility model will not be limited to these embodiments shown in this article, but should conform to the widest range consistent with the principles and novel features disclosed in this article. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model still fall within the scope of the technical solution of the utility model.

Claims

1. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler, comprising at least a medium-deep coaxial casing geothermal well (1); characterized in that: The invention also comprises a heat pump unit (2), an electric boiler (3), a first plate heat exchanger (4), a heat storage tank (5), a second plate heat exchanger (6), a third plate heat exchanger (7), a water collector (8) and a water distributor (9); the medium-deep coaxial casing geothermal well (1) and the heat pump unit (2) are connected by a pipeline to form a first loop; the water collector (8), the water distributor (9) and the heat pump unit (2) form a second loop; the heat pump unit (2), the second plate heat exchanger (6), the water collector (8) and the water distributor (9) are connected by a pipeline to form a third loop; the electric boiler (3) and the first plate heat exchanger (4) are connected by a pipeline to form a third loop. The first plate heat exchanger (4) and the heat storage tank (5) are connected by a pipeline to form a fourth loop; the first plate heat exchanger (4) and the heat storage tank (5) are connected by a pipeline to form a fifth loop; the heat storage tank (5) and the second plate heat exchanger (6) are connected by a pipeline to form a sixth loop; the heat storage tank (5) and the third plate heat exchanger (7) are connected by a pipeline to form a seventh loop; the third plate heat exchanger (7), the water collector (8) and the water distributor (9) are connected by a pipeline to form an eighth loop; the output port of the water collector (8) and the cold water input port of the heat pump unit (2) are connected by a pipeline, and the pipeline is connected to the second water pump (11) and the first water pump (12). The heat pump unit (2) has three valves (18), and the second water pump (11) is arranged near the cold water input port of the heat pump unit (2), and the third valve (18) is arranged near the output port of the water collector (8). The third valve (18) and the second water pump (11) are connected to the cold water inlet of the third plate heat exchanger (7) through a connecting pipeline, and the sixth water pump (15) and the fourteenth valve (29) are connected to the connecting pipeline; the hot water output port of the heat pump unit (2) and the input port of the water distributor (9) are connected through a connecting pipeline, and the fifth valve (20) is connected to the connecting pipeline; the front end of the fifth valve (20) is connected to the first valve (20) through a pipeline. The hot water input port of the second plate heat exchanger (6) is connected to the pipeline, and a fourth valve (19) is connected to the pipeline; the rear end of the fifth valve (20) is connected to the hot water output port of the second plate heat exchanger (6) through a pipeline; the hot water outlet of the third plate heat exchanger (7) is connected to the water distributor (9) through a pipeline connected to a fifteenth valve (30); the cold water outlet of the third plate heat exchanger (7) is connected to the cold water inlet of the heat storage tank (5) through a pipeline connected to a thirteenth valve (28); and the hot water inlet of the third plate heat exchanger (7) is connected to the hot water outlet of the heat storage tank (5) through a pipeline connected to an eleventh valve (26).

2. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler as claimed in claim 1, characterized in that: The first loop comprises a first input pipeline, a first output pipeline, a first water pump (10) and a second valve (17); the first input pipeline is connected to the water outlet of the medium-deep coaxial casing geothermal well (1) and the hot water inlet of the heat pump unit (2), and the first input pipeline is connected to the first water pump (10); the first output pipeline is connected to the inlet of the medium-deep coaxial casing geothermal well (1) and the cold water outlet of the heat pump unit (2), and the first output pipeline is connected to the second valve (17).

3. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler as claimed in claim 1, characterized in that: The second circuit is composed of a water collector (8), a third valve (18), a second water pump (11), a heat pump unit (2), a fifth valve (20) and a water distributor (9); the water collector (8) is connected to the water distributor (9) via the third valve (18), the second water pump (11), the heat pump unit (2) and the fifth valve (20) in sequence; the fifth valve (20) is used to control the connection and disconnection of the connecting pipeline between the input port of the water distributor (9) and the heat pump unit (2).

4. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler as claimed in claim 1, characterized in that: The third circuit is composed of a heat pump unit (2), a second plate heat exchanger (6), a water collector (8) and a water distributor (9); the water collector (8) is connected to the water distributor (9) in sequence through a third valve (18), a second water pump (11), a heat pump unit (2), a fourth valve (19), and the second plate heat exchanger (6).

5. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with electric boilers as claimed in claim 1, characterized in that: The fourth loop comprises at least a second input pipeline, a second output pipeline, a third water pump (12), a sixth valve (21) and a seventh valve (22); the two ends of the second input pipeline are respectively connected to the cold water output end of the first plate heat exchanger (4) and the input end of the electric boiler (3), and the second input pipeline is connected to the third water pump (12) and the seventh valve (22); the two ends of the second output pipeline are respectively connected to the hot water input end of the first plate heat exchanger (4) and the output end of the electric boiler (3), and the second output pipeline is connected to the sixth valve (21); the electric boiler (3), the sixth valve (21), the first plate heat exchanger (4), the third water pump (12) and the electric boiler (3) are connected in sequence to form a loop.

6. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with electric boilers as claimed in claim 1, characterized in that: The fifth loop comprises at least a third input pipeline, a third output pipeline, a fourth water pump (13), an eighth valve (23) and a ninth valve (24); the two ends of the third input pipeline are respectively connected to the hot water input end of the first plate heat exchanger (4) and the hot water output end of the heat storage tank (5); the third input pipeline is connected to the fourth water pump (13) and the ninth valve (24); the two ends of the third output pipeline are respectively connected to the hot water output end of the first plate heat exchanger (4) and the hot water input end of the heat storage tank (5); the third output pipeline is connected to the eighth valve (23); the primary side return water of the heat storage tank (5) is connected to the heat storage tank (5) via the ninth valve (24), the fourth water pump (13), the first plate heat exchanger (4) and the eighth valve (23) in sequence.

7. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler as claimed in claim 1, characterized in that: The sixth circuit comprises at least a fourth input pipeline, a fourth output pipeline, a fifth water pump (14), a tenth valve (25) and a twelfth valve (27); the two ends of the fourth input pipeline are respectively connected to the cold water input end of the heat storage tank (5) and the cold water input and output ends of the second plate heat exchanger (6); the fourth input pipeline is connected to the twelfth valve (27) and the fifth water pump (14); the two ends of the fourth output pipeline are respectively connected to the hot water output end of the heat storage tank (5) and the hot water input end of the second plate heat exchanger (6); the fourth output pipeline is connected to the tenth valve (25); the secondary side water supply of the heat storage tank (5) returns to the heat storage tank (5) through the tenth valve (25), the second plate heat exchanger (6) and the fifth water pump (14) in sequence; the rear end of the fifth water pump (14) and the front end of the tenth valve (25) are respectively connected to the third plate heat exchanger (7) through pipelines.

8. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with electric boilers as claimed in claim 1, characterized in that: The seventh loop is a secondary water supply of the heat storage tank (5), which returns to the heat storage tank (5) via the eleventh valve (26), the third plate heat exchanger (7), and the thirteenth valve (28).

9. A heat storage heating system for absorbing abandoned electricity by coupling medium-deep geothermal energy with an electric boiler as claimed in claim 1, characterized in that: The eighth circuit is from the water collector (8) through the sixth water pump (15), the third plate heat exchanger (7), the fifteenth valve (30) to the water distributor (9).

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