A distributed pumped storage system based on a large height difference heating network

Abstract

The present invention discloses a distributed pumped storage system based on a large height difference heating network, which is equipped with a large height difference water transmission network unit, a power station unit, a pumped storage unit and a centralized heating unit. The pumped storage unit includes a low-level water collection chamber, a high-level water collection chamber, a pump turbine and a power grid. The pump turbine has a water pump mode and a water turbine mode, and performs pumped storage based on the water pump mode and regenerates electricity based on the water turbine mode; the centralized heating unit includes a high-level heating unit and a low-level heating unit. The present invention connects multiple types of power stations and pumped storage units, and uses the pumped storage units to store energy and regenerate electricity for load changes of wind farms and solar power stations, thereby realizing the function of stable output of electric energy by shaving peaks and filling valleys. It also stores energy and regenerates electricity for thermal power generating sets in the process of flexible deep peak regulation, thereby realizing efficient and comprehensive utilization throughout the year, and solving the problem of disconnected and inefficient operation of various parts during the energy structure adjustment process.

Description

Technical Field

[0001] The invention relates to a distributed pumped storage system, in particular to a distributed pumped storage system based on a large height difference heating pipe network. Background Art

[0002] With the construction of urbanization and the requirements of environmental protection, the areas in the north that need heating in winter will have thermal power plants that serve as centralized heating sources located far away from the city. In addition, many cities have built urban heating pipelines with large elevation differences. As a large-scale municipal construction project, the urban heating pipeline network only operates during the heating season, and the overall economic feasibility of the project is limited to a certain extent.

[0003] Due to the intermittent nature of wind and solar power generation, the large-capacity energy storage systems that match them have not yet been popularized, resulting in serious wind and solar power abandonment in clean energy power stations. With the increasing number of new energy power stations such as wind power and photovoltaic power stations, cogeneration thermal power units are developing in the direction of flexible and deep peak regulation, while the existing thermal power units have limited means of rapid response and flexible peak regulation and low efficiency. In addition, existing pumped-storage power stations can also generate electricity. Large-capacity pumped-storage power stations are very difficult to coordinate with multiple supporting power stations, especially new energy power stations, which is not conducive to the operation of large-capacity pumped-storage power stations.

[0004] Therefore, the existing energy storage heating technology has the following technical problems: intermittent load changes in wind power and photovoltaic power stations, the low efficiency of thermal power units in quickly responding to flexible peak-shaving, and the large scale of pumped-storage power stations, which makes it difficult to coordinate pumped-storage power stations with new energy power stations, and the various parts of the energy structure adjustment process are disconnected and operate inefficiently. Summary of the invention

[0005] To this end, the present invention provides a distributed pumped storage system based on a large height difference heating pipeline network. The load changes of wind farms and solar power stations are stored and regenerated through pumped storage units, thereby realizing the function of peak shaving and valley filling and stable output of electric energy. Energy can also be stored and regenerated for thermal power generating sets in the process of flexible deep peak regulation. At the same time, the function of the original urban centralized heating pipeline network that only operates in the heating season is expanded to achieve efficient and comprehensive utilization throughout the year, solving the problem of disconnected and inefficient operation of various parts during the energy structure adjustment process.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: a distributed pumped storage system based on a large height difference heating pipe network, comprising:

[0007] A large height difference water pipe network unit, which includes a water supply loop, a relay pump station and related pipelines. The water supply loop is used for heating and pumped storage;

[0008] A power station unit, which includes a thermal power generating unit, a wind farm, and a solar power station. The power station unit is used to generate electricity using thermal power, wind power, and solar power, and to supply power to a pumped storage unit;

[0009] A pumped storage unit, comprising a low-level water collection chamber, a high-level water collection chamber, a pump-turbine and a power grid, wherein the thermal power generating set, the wind farm and the solar power station are connected to the power input end of the pump-turbine through a cable, the power output end of the pump-turbine is connected to the power grid through a cable, the low-level water collection chamber is connected to the pump-turbine, the waterway outlet of the pump-turbine is connected to a low-level reservoir, the high-level water collection chamber is connected to a high-level reservoir, the high-level water collection chamber and the low-level water collection chamber are connected through the water transfer loop, the pump-turbine has a water pump mode and a water turbine mode, and performs pumped storage based on the water pump mode and regenerates electricity based on the water turbine mode;

[0010] A centralized heating unit, comprising a high-level heating unit and a low-level heating unit, wherein the high-level heating unit is correspondingly connected to the high-level water collection chamber, and the low-level heating unit is correspondingly connected to the low-level water collection chamber. The centralized heating unit is provided with a user-side heating unit and a heat source-side heating unit, wherein one of the user-side heating unit and the heat source-side heating unit is arranged in the high-level heating unit, and one of the user-side heating unit and the heat source-side heating unit is arranged in the low-level heating unit.

[0011] Further, the water delivery loop includes a first water delivery path and a second water delivery path;

[0012] The first water supply line and the second water supply line are both connected to the high-position water collection chamber at one end and connected to the low-position water collection chamber at the other end, and at least one relay pump station is arranged on the second water supply line.

[0013] Further, the low-level water collection chamber includes a first water collection chamber, a first purification device, a second purification device and a third purification device;

[0014] One end of the first water supply path is connected to the first purification device through a water distribution branch pipe via a first valve, the first purification device is connected to the first sub-collection chamber through a pipeline, the first sub-collection chamber is connected to the second valve through a pipeline through the second purification device, and the second valve is connected to the second water supply path.

[0015] Furthermore, the first water collection chamber is connected to the water pump turbine through the third purification device and the third valve, and the water outlet of the water pump turbine is connected to the low-level water reservoir through the fourth valve.

[0016] Further, the high-level water collection chamber includes a second water collection chamber, a fourth purification device, a fifth purification device and a sixth purification device;

[0017] The second water supply line passes through the relay pump station and the fifth valve, and is connected to the fifth purification device through the sixth valve. One side of the fifth purification device is connected to the second sub-collection chamber through a pipeline. The other side of the second sub-collection chamber passes through the fourth purification device and is connected to the nineteenth valve through a water branch pipe. The other side of the nineteenth valve is connected to the first water supply line.

[0018] Furthermore, the second water collection chamber is connected to the high-level water reservoir after passing through the sixth purification device and the seventh valve.

[0019] Furthermore, the second water supply path is connected to the high-position heating unit via a fourteenth valve, and the outlet of the high-position heating unit is connected to the first water supply path via a sixteenth valve;

[0020] One end of the first water supply path is connected to the inlet of the low-position heating unit through a pipeline via an eighth valve, and the outlet pipeline of the low-position heating unit is connected to the second water supply path via a ninth valve.

[0021] Further, the user-side heating unit includes a first heat exchanger, a first CO2 heat pump, a heat user-side circulating water pump and a heat user;

[0022] The outlet of the first heat exchanger is connected to the first CO2 heat pump through a pipeline, and the other side of the CO2 heat pump is connected to the inlet of the circulating water pump on the heat user side through a pipeline.

[0023] Furthermore, the pipeline of the heat user outlet is divided into two, which are respectively connected to the inlet of the first heat exchanger through the tenth valve and connected to the inlet of the first CO2 heat pump through the eleventh valve;

[0024] The other side outlet of the first heat exchanger is connected to the twelfth valve, the other side outlet of the first CO2 heat pump is connected to the thirteenth valve, and the outlets of the twelfth valve and the thirteenth valve are combined into a pipeline connected to the heat user.

[0025] Further, the heat source side heating unit includes a heat source side circulating water pump, a second heat exchanger, a second CO2 heat pump and a heat source of a cogeneration thermal power plant;

[0026] The output end of the circulating water pump on the heat source side is divided into two branches, one of which is connected to the second heat exchanger through the fifteenth valve, and the other is connected to the second CO2 heat pump through the seventeenth valve, and the outlet of the second CO2 heat pump is connected to the eighteenth valve, and the eighteenth valve enters the second heat exchanger through a pipeline connection;

[0027] The second heat exchanger is also provided with a heat exchange loop, and is connected to a heat source of a cogeneration thermal power plant through the heat exchange loop.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention connects the wind farm, solar power station, thermal power generating set and pumped storage unit through a large height difference heating pipeline network, stores energy and regenerates electricity through the pumped storage unit according to the load changes of the wind farm and solar power station, realizes the function of peak shaving and valley filling and stable output of electric energy, can also store energy and regenerate electricity for the thermal power generating set in the process of flexible deep peak regulation, and at the same time expands the function of the original urban centralized heating pipeline network that only operates in the heating season, realizes efficient and comprehensive utilization throughout the year, and solves the problem of disconnected and inefficient operation of various parts in the process of energy structure adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] Figure 1 A schematic structural diagram of a distributed pumped storage system based on a large height difference heating network provided by an embodiment of the present invention;

[0032] Figure 2 It is a structural schematic diagram of a high-level water collection chamber in an embodiment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a low-level water collection chamber in an embodiment of the present invention;

[0034] Figure 4 It is a structural schematic diagram of a user-side heating unit in an embodiment of the present invention;

[0035] Figure 5 It is a structural schematic diagram of a heat source side heating unit in an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of the structure of a system structure 1 in an embodiment of the present invention;

[0037] Figure 7 Schematic diagram of the structure of system structure 2 in an embodiment of the present invention.

[0038] The numbers in the figure represent the following:

[0039] 1-first water transmission route; 2-low-level water collection chamber; 3-pump turbine; 4-low-level reservoir; 5-thermal power generator; 6-wind farm; 7-solar power station; 8-power grid; 9-second water transmission route; 10-high-level water collection chamber; 11-high-level reservoir; 12-high-level heating unit; 13-low-level heating unit; 14-relay pump station; 15-first valve; 16-second valve; 17-third valve; 18-fourth valve; 19-fifth valve; 20-sixth valve; 21-nineteenth valve; 22-seventh valve; 23-fourteenth valve; 24-sixteenth valve; 25-eighth valve; 26-ninth valve; 27-second water collection chamber Water collecting chamber; 28-fourth purification device; 29-fifth purification device; 30-sixth purification device; 31-first sub-water collecting chamber; 32-first purification device; 33-second purification device; 34-third purification device; 35-first heat exchanger; 36-first CO2 heat pump; 37-circulating water pump on the heat user side; 38-heat user; 39-tenth valve; 40-twelfth valve; 41-eleventh valve; 42-thirteenth valve; 43-circulating water pump on the heat source side; 44-second heat exchanger; 45-second CO2 heat pump; 46-heat source of cogeneration thermal power plant; 47-fifteenth valve; 48-seventeenth valve; 49-eighteenth valve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, the present invention provides a distributed pumped storage system based on a large height difference heating pipeline network, which is equipped with a large height difference water transmission pipeline network unit, a power station unit, a pumped storage unit and a centralized heating unit.

[0042] There are two major types of system structures corresponding to the present invention. The first type is recorded as system structure one, specifically, a heat source side heating unit is arranged in the high-level heating unit 12, and a user side heating unit is arranged in the low-level heating unit 13;

[0043] The second category is recorded as system structure 2, specifically, a user-side heating unit is arranged in the high-level heating unit 12, and a heat source-side heating unit is arranged in the low-level heating unit.

[0044] Among them, the large height difference water supply network unit includes a water supply loop, a relay pump station 14 and related pipelines. The water supply loop is used for heating and pumped storage.

[0045] The power station unit includes a thermal power generating set 5, a wind farm 6, and a solar power station 7. The power station unit is used to generate electricity using thermal power, wind power, and solar power, and to supply power to the pumped storage unit.

[0046] The pumped storage unit includes a low-level water collection chamber 2, a high-level water collection chamber 10, a pump-turbine 3 and a power grid 8. The thermal power generator set 5, the wind farm 6 and the solar power station 7 are connected to the power input end of the pump-turbine 3 through cables, and the power output end of the pump-turbine 3 is connected to the power grid 8 through cables. The low-level water collection chamber 2 is connected to the pump-turbine 3, and the water outlet of the pump-turbine 3 is connected to the low-level reservoir 4. The high-level water collection chamber 10 is connected to the high-level reservoir 11. The high-level water collection chamber 10 and the low-level water collection chamber 2 are connected through a water transfer loop. The pump-turbine 3 has a pump mode and a turbine mode, and performs pumped storage based on the pump mode and regenerates electricity based on the turbine mode.

[0047] The central heating unit includes a high-level heating unit 12 and a low-level heating unit 13. The high-level heating unit 12 is correspondingly connected to the high-level water collection chamber 10, and the low-level heating unit 13 is correspondingly connected to the low-level water collection chamber 2. The central heating unit has a user-side heating unit and a heat source-side heating unit. One of the user-side heating unit and the heat source-side heating unit is arranged in the high-level heating unit 12, and one of the user-side heating unit and the heat source-side heating unit is arranged in the low-level heating unit 13.

[0048] In the large height difference water supply network unit, the water supply loop includes a first water supply path 1 and a second water supply path 9;

[0049] One end of the first water supply line 1 and the second water supply line 9 are connected to the high-level water collection chamber 10, and the other end is connected to the low-level water collection chamber 2. At least one relay pump station 14 is arranged on the second water supply line 9 to form a water supply loop, wherein the relay pump station 14 can be single or multiple along the way, and can be flexibly adjusted according to the actual distribution.

[0050] In the power station unit, the solar power station 7, the wind farm 6, and the thermal power generating set 5 are respectively connected to the power input end of the water pump turbine 3 through cables. When the electric energy generated by the wind farm 6 and the solar power station 7 needs to be stored, it can be directly transmitted to the water pump turbine 3 through cables. When the thermal power generating set 5 needs deep peak regulation for energy storage, it is also transmitted to the water pump turbine 3 through cables. The water pump turbine 3 can be used for two purposes, that is, it can use the water pump mode for pumped storage and can also use the water turbine mode for regeneration. It is an efficient energy storage system.

[0051] In pumped storage units, e.g. Figure 3As shown, the low-level water collection chamber 2 includes a first water collection chamber 31, a first purification device 32, a second purification device 33 and a third purification device 34; one end of the first water supply path 1 is connected to the first purification device 32 through a water distribution branch pipe via a first valve 15, the first purification device 32 is connected to the first water collection chamber 31 through a pipeline, the first water collection chamber 31 is connected to the second valve 16 through a pipeline via a second purification device 33, the second valve 16 is connected to the second water supply path 9, the first water collection chamber 31 is connected to the pump-turbine 3 through a third purification device 34 and a third valve 17, and the waterway outlet of the pump-turbine 3 is connected to the low-level reservoir 4 through a fourth valve 18.

[0052] In addition, if Figure 2 As shown, the high-level water collection chamber 10 includes a second water collection chamber 27, a fourth purification device 28, a fifth purification device 29 and a sixth purification device 30; the second water supply path 9 passes through the relay pump station 14 and the fifth valve 19, and is connected to the fifth purification device 29 through the sixth valve 20. One side of the fifth purification device 29 is connected to the second water collection chamber 27 through a pipeline. The other side of the second water collection chamber 27 passes through the fourth purification device 28 and is connected to the nineteenth valve 21 through a water branch pipe. The other side of the nineteenth valve 21 is connected to the first water supply path 1. The second water collection chamber 27 passes through the sixth purification device 30 and the seventh valve 22 and is connected to the high-level reservoir 11.

[0053] In the centralized heating unit, the second water supply path 9 is connected to the high-level heating unit 12 through the fourteenth valve 23, and the outlet of the high-level heating unit 12 is connected to the first water supply path 1 through the sixteenth valve 24; one end of the first water supply path 1 is connected to the inlet of the low-level heating unit 13 through the pipeline via the eighth valve 25, and the outlet pipeline of the low-level heating unit 13 is connected to the second water supply path 9 through the ninth valve 26.

[0054] In the above embodiment, the difference between system structure 1 and system structure 2 is mainly that: Figure 6 As shown, in the system structure 1, the heat source side heating unit is arranged in the high-level heating unit 12, and the user side heating unit is arranged in the low-level heating unit 13; Figure 7 As shown, in the system structure 2, the user-side heating unit is arranged in the high-level heating unit 12, and the heat source-side heating unit is arranged in the low-level heating unit.

[0055] Among them, Figure 4As shown, the user-side heating unit includes a first heat exchanger 35, a first CO2 heat pump 36, a heat user-side circulating water pump 37 and a heat user 38; the outlet of the first heat exchanger 35 is connected to the first CO2 heat pump 36 through a pipeline, and the other side of the CO2 heat pump 36 is connected to the inlet of the heat user-side circulating water pump 37 through a pipeline, and the pipeline at the outlet of the heat user 38 is divided into two, which are respectively connected to the inlet of the first heat exchanger 35 through the tenth valve 39 and the inlet of the first CO2 heat pump 36 through the eleventh valve 41, the outlet on the other side of the first heat exchanger 35 is connected to the twelfth valve 40, the outlet on the other side of the first CO2 heat pump 36 is connected to the thirteenth valve 42, and the outlets of the twelfth valve 40 and the thirteenth valve 42 merge into a pipeline and are connected to the heat user 38.

[0056] like Figure 5 As shown, the heat source side heating unit includes a heat source side circulating water pump 43, a second heat exchanger 44, a second CO2 heat pump 45 and a heat source 46 of a cogeneration thermal power plant; the output end of the heat source side circulating water pump 43 is divided into two branches, one of which is connected to the second heat exchanger 44 through a fifteenth valve 47, and the other is connected to the second CO2 heat pump 45 through a seventeenth valve 48. The outlet of the second CO2 heat pump 45 is connected to the eighteenth valve 49, and the eighteenth valve 49 enters the second heat exchanger 44 through a pipeline connection. A heat exchange loop is also provided on the second heat exchanger 44, and is connected to the heat source 46 of the cogeneration thermal power plant through the heat exchange loop.

[0057] In the system structure 1: one end of the first water supply path 1 is connected to the inlet of the first heat exchanger 35 through the pipeline via the eighth valve 25, and the outlet pipeline of the circulating water pump 37 on the heat user side is connected to the second water supply path 9 via the ninth valve 26;

[0058] The second water supply path 9 is connected to the heat source side circulating water pump 43 through the fourteenth valve 23 , and the outlet of the second heat exchanger 44 is connected to the first water supply path 1 through the sixteenth valve 24 .

[0059] In the second system structure: one end of the first water supply path 1 is connected to the heat source side circulating water pump 43 through the eighth valve 25, and the outlet of the second heat exchanger 44 is connected to the second water supply path 9 through the ninth valve 26;

[0060] The second water supply path 9 is connected to the inlet of the first heat exchanger 35 through a pipeline via the fourteenth valve 23 , and the outlet pipeline of the circulating water pump 37 on the heat user side is connected to the first water supply path 1 via the sixteenth valve 24 .

[0061] Different system structures have corresponding energy storage movement modes, regeneration movement modes and heating operation modes, as follows:

[0062] 1. System structure 1: The energy storage operation mode of system structure 1 is as follows:

[0063] The starting units are: the first water transmission line 1, the second water transmission line 9; the low-level water collection chamber 2, the pump-turbine 3, the low-level reservoir 4; the solar power station 7, the wind farm 6 or the thermal power generating set 5; the high-level water collection chamber 10, the high-level reservoir 11, open the first valve 15, the second valve 16, the third valve 17, the fourth valve 18, the fifth valve 19, the sixth valve 20, the nineteenth valve 21, and the seventh valve 22; other units, equipment and valves are all closed.

[0064] When the solar power station 7, the wind farm 6, or the thermal power generating set 5 has excess electric energy to be stored, the pump-turbine 3 connected to the power station through the cable starts to work in the pump mode, and pumps the water of the low-level reservoir 4 into the first sub-collection chamber 31 through the third valve 17, the fourth valve 18, and the third purification device 34. Then the water flow is divided into two streams, which respectively pass through the corresponding first purification device 32, the second purification device 33, the first valve 15, and the second valve 16, and then enter the first water transmission path 1 and the second water transmission path 9. Then, at the other end of the first water transmission path 1 and the second water transmission path 9, they pass through the sixth valve 20 and the nineteenth valve 21 respectively, and then flow into the second sub-collection chamber 27 after passing through the fourth purification device 28 and the fifth purification device 29, and then enter the high-level reservoir 11 through the sixth purification device 30 and the seventh valve 22, completing the process of converting electric energy into the gravitational potential energy of water.

[0065] The regeneration operation mode of system structure 1 is as follows:

[0066] The starting units are: the first water supply line 1, the second water supply line 9; the low-level water collection chamber 2, the pump-turbine 3, the low-level reservoir 4; the power grid 8; the high-level water collection chamber 10, the high-level reservoir 11, and the first valve 15, the second valve 16, the third valve 17, the fourth valve 18, the fifth valve 19, the sixth valve 20, the nineteenth valve 21, and the seventh valve 22 are opened; other units, equipment and valves are closed.

[0067] When the power load of the power station is low and the energy storage system is required to provide electric energy, the water of the high-level reservoir 11 passes through the seventh valve 22, the sixth purification device 30 and the second water collection chamber 27, and then is divided into two branches and passes through the fourth purification device 28 and the fifth purification device 29, the sixth valve 20 and the nineteenth valve 21 respectively, and then enters the first water transmission path 1 and the second water transmission path 9, and then passes through the first valve 15 and the second valve 16, the first purification device 32 and the second purification device 33 at the other end of the water transmission pipeline, and then merges into the first water collection chamber 31, and then passes through the third purification device 34 and the third valve 17 to enter the pump turbine 3, drive the pump turbine 3 to generate electricity, and the electric energy is transmitted to the power grid 8 through the cable to complete the regeneration of the system.

[0068] The heating operation mode of system structure 1 is as follows:

[0069] The start-up units are: the first water supply line 1 and the second water supply line 9, the relay pump station 14; the first heat exchanger 35, the first CO2 heat pump 36, the heat user side circulating water pump 37, and the heat user 38 of the low-level heating unit 13; the second heat exchanger 44, the second CO2 heat pump 45, the heat source side circulating water pump 43 and the cogeneration thermal power plant heat source 46 of the high-level heating unit 12; the fourteenth valve 23, the sixteenth valve 24, the eighth valve 25, the ninth valve 26, the tenth valve 39, the twelfth valve 40, the eleventh valve 41, the thirteenth valve 42, the fifteenth valve 47, the seventeenth valve 48, and the eighteenth valve 49 are opened; other units, equipment and valves are closed.

[0070] After passing through the fourteenth valve 23, the heat supply circulating water with a lower temperature passes through the heat source side circulating water pump 43, and the pressure of the circulating water is increased. Then the circulating water is divided into two parts. One part passes through the fifteenth valve 47 and enters the second heat exchanger 44. The other part passes through the seventeenth valve 48 and the second CO2 heat pump 45, and then passes through the eighteenth valve 49 to enter the second heat exchanger 44. The heat source 46 of the cogeneration thermal power plant transfers heat to the heat supply circulating water in the second heat exchanger 44. The heat supply circulating water with a higher temperature passes through the sixteenth valve 24 and enters the first water supply path. 1, and then enters the first heat exchanger 35 of the low-level heating unit 13 after passing through the eighth valve 25. The first heat exchanger 35 heats the relatively low-temperature circulating water from the heat user 38, and then further transfers the heat to the heating circulating water on the heat user side through the first CO2 heat pump 36. Then, the relatively low-temperature heating circulating water passes through the circulating water pump 37 on the heat user side and the ninth valve 26 and enters the second water transmission path 9. After being pressurized by the relay pump station 14, it passes through the fourteenth valve 23 and returns to the circulating water pump 43 on the heat source side, completing the hot water supply cycle of the large height difference heating network.

[0071] The circulating water on the heat user side is at a relatively high temperature when it flows out from the outlets of the first heat exchanger 35 and the first CO2 heat pump 36, and then passes through the twelfth valve 40 and the thirteenth valve 42 respectively, and is collected together to enter the heat user 38 to provide the heat required for heating for the heat user. After the heat release is completed, the circulating water on the heat user side with a relatively low temperature is divided into two and flows through the tenth valve 39 and the eleventh valve 41 respectively to enter the first heat exchanger 35 and the first CO2 heat pump 36 to absorb heat, thereby completing the heating cycle on the heat user side.

[0072] 2. System Structure 2: The energy storage operation mode and regeneration mode of System Structure 2 are consistent with those of System Structure 1.

[0073] System structure 2 has a different heating mode from system structure 1. The heating operation mode of system structure 2 is as follows:

[0074] The start-up units are: the first water supply line 1 and the second water supply line 9, the relay pump station 14; the first heat exchanger 35, the first CO2 heat pump 36, the heat user side circulating water pump 37, and the heat user 38 of the high-level heating unit 12; the second heat exchanger 44, the second CO2 heat pump 45, the heat source side circulating water pump 43 and the cogeneration thermal power plant heat source 46 of the low-level heating unit 13; the fourteenth valve 23, the sixteenth valve 24, the eighth valve 25, the ninth valve 26, the tenth valve 39, the twelfth valve 40, the eleventh valve 41, the thirteenth valve 42, the fifteenth valve 47, the seventeenth valve 48, and the eighteenth valve 49 are opened; other units, equipment and valves are closed.

[0075] After passing through the eighth valve 25, the heat supply circulating water with a lower temperature passes through the heat source side circulating water pump 43, and the pressure of the circulating water is increased. Then the circulating water is divided into two parts. One part passes through the fifteenth valve 47 and enters the second heat exchanger 44. The other part passes through the seventeenth valve 48 and the second CO2 heat pump 45 for heating, and then passes through the eighteenth valve 49 to enter the second heat exchanger 44. The heat source 46 of the cogeneration thermal power plant transfers heat to the heat supply circulating water in the second heat exchanger 44. The heat supply circulating water with a higher temperature passes through the ninth valve 26 and enters the second water transmission path 9. After being pressurized by the relay pump station 14, it enters the first heat exchanger 35 of the high-level heating unit 12 after passing through the fourteenth valve 23. The first heat exchanger 35 heats the lower-temperature circulating water from the heat user 38, and then further transfers the heat to the heating circulating water on the heat user side through the first CO2 heat pump 36. Then, the lower-temperature heating circulating water passes through the circulating water pump 37 on the heat user side and the sixteenth valve 24 and enters the first water transmission path 1, and then returns to the circulating water pump 43 on the heat source side through the eighth valve 25, completing the hot water supply circulation of the large height difference heating pipeline network.

[0076] The circulating water on the heat user side is at a relatively high temperature when it flows out from the outlets of the first heat exchanger 35 and the first CO2 heat pump 36, and then passes through the twelfth valve 40 and the thirteenth valve 42 respectively, and is collected together to enter the heat user 38 to provide the heat required for heating for the heat user. After the heat release is completed, the circulating water on the heat user side with a relatively low temperature is divided into two and flows through the tenth valve 39 and the eleventh valve 41 respectively to enter the first heat exchanger 35 and the first CO2 heat pump 36 to absorb heat, thereby completing the heating cycle on the heat user side.

[0077] The present invention realizes the energy storage of the wind farm 6 and the solar power station 7 and the smooth output of electric energy, realizes the flexible deep peak-shaving energy storage of the thermal power generating set 5, and realizes the comprehensive utilization of the centralized heating unit throughout the year. At the same time, according to the installed capacity of the wind farm 6, the solar power station 7 and the thermal power generating set 5 and the construction conditions of the reservoir, the capacity of the appropriate pumped storage unit is selected, which can be of various types such as daily regulation type, weekly regulation type and cross-season regulation type. The cross-seasonally regulated pumped storage unit can also use the heat pump unit for cross-season energy storage, so that the pumped storage unit can not only store potential energy but also store thermal energy, thereby improving the energy storage capacity. In addition, the low-level reservoir 4 in the pumped storage unit can utilize the urban water body, and the urban planning and the energy storage system can be constructed simultaneously to realize the comprehensive utilization of the system.

[0078] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A distributed pumped storage system based on a large height difference heating pipe network, characterized in that: have: A large height difference water supply network unit, which includes a water supply loop, a relay pump station (14) and related pipelines, wherein the water supply loop is used for heating and pumped storage; A power station unit, which includes a thermal power generating set (5), a wind farm (6), and a solar power station (7), wherein the power station unit is used to generate electricity using thermal power, wind power, and solar power, and to supply power to a pumped storage unit; A pumped storage unit, comprising a low-level water collection chamber (2), a high-level water collection chamber (10), a pump turbine (3) and a power grid (8), wherein the thermal power generator set (5), the wind farm (6) and the solar power station (7) are connected to the power input end of the pump turbine (3) via a cable, the power output end of the pump turbine (3) is connected to the power grid (8) via a cable, the low-level water collection chamber (2) is connected to the pump turbine (3), the water outlet of the pump turbine (3) is connected to a low-level reservoir (4), the high-level water collection chamber (10) is connected to a high-level reservoir (11), the high-level water collection chamber (10) and the low-level water collection chamber (2) are connected via the water transfer loop, the pump turbine (3) has a water pump mode and a water turbine mode, and performs pumped storage based on the water pump mode and regenerates electricity based on the water turbine mode; A central heating unit, comprising a high-position heating unit (12) and a low-position heating unit (13), wherein the high-position heating unit (12) is connected to the high-position water collecting chamber (10) correspondingly, and the low-position heating unit (13) is connected to the low-position water collecting chamber (2) correspondingly, and the central heating unit comprises a user-side heating unit and a heat source-side heating unit, wherein one of the user-side heating unit and the heat source-side heating unit is arranged in the high-position heating unit (12), and one of the user-side heating unit and the heat source-side heating unit is arranged in the low-position heating unit (13); In the system structure one, a heat source side heating unit is arranged in the high-position heating unit (12), and a user side heating unit is arranged in the low-position heating unit (13); in the system structure two, a user side heating unit is arranged in the high-position heating unit (12), and a heat source side heating unit is arranged in the low-position heating unit; The user-side heating unit comprises a first heat exchanger (35), a first CO2 heat pump (36), a heat user-side circulating water pump (37) and a heat user (38); The outlet of the first heat exchanger (35) is connected to the first CO2 heat pump (36) via a pipeline, and the other side of the first CO2 heat pump (36) is connected to the inlet of a circulating water pump (37) on the heat user side via a pipeline; The outlet pipeline of the heat user (38) is divided into two parts, which are respectively connected to the inlet of the first heat exchanger (35) through a tenth valve (39) and connected to the inlet of the first CO2 heat pump (36) through an eleventh valve (41); The outlet on the other side of the first heat exchanger (35) is connected to a twelfth valve (40), the outlet on the other side of the first CO2 heat pump (36) is connected to a thirteenth valve (42), and the outlets of the twelfth valve (40) and the thirteenth valve (42) are combined into a pipeline and connected to the heat user (38); The heat source side heating unit comprises a heat source side circulating water pump (43), a second heat exchanger (44), a second CO2 heat pump (45) and a heat source (46) of a cogeneration thermal power plant; The output end of the heat source side circulating water pump (43) is divided into two branches, one of which is connected to the second heat exchanger (44) through a fifteenth valve (47), and the other is connected to the second CO2 heat pump (45) through a seventeenth valve (48), and the outlet of the second CO2 heat pump (45) is connected to an eighteenth valve (49), and the eighteenth valve (49) enters the second heat exchanger (44) through a pipeline connection; The second heat exchanger (44) is also provided with a heat exchange loop, and is connected to a heat source (46) of a cogeneration thermal power plant through the heat exchange loop.

2. A distributed pumped storage system based on a large height difference heating network according to claim 1, characterized in that: The water delivery loop comprises a first water delivery path (1) and a second water delivery path (9); The first water supply path (1) and the second water supply path (9) are both connected to the high-position water collection chamber (10) at one end and to the low-position water collection chamber (2) at the other end, and at least one relay pump station (14) is provided on the second water supply path (9).

3. A distributed pumped storage system based on a large height difference heating network according to claim 2, characterized in that: The low-level water collection chamber (2) comprises a first water collection chamber (31), a first purification device (32), a second purification device (33) and a third purification device (34); One end of the first water supply path (1) is connected to the first purification device (32) through a first valve (15) via a water branch pipe; the first purification device (32) is connected to a first water collection chamber (31) via a pipeline; the first water collection chamber (31) is connected to a second valve (16) via a pipeline through the second purification device (33); the second valve (16) is connected to the second water supply path (9).

4. A distributed pumped storage system based on a large height difference heating pipe network according to claim 3, characterized in that: The first water collection chamber (31) is connected to the water pump turbine (3) through the third purification device (34) and the third valve (17), and the water outlet of the water pump turbine (3) is connected to the low-level reservoir (4) through a fourth valve (18).

5. A distributed pumped storage system based on a large height difference heating network according to claim 4, characterized in that: The high-level water collection chamber (10) comprises a second water collection chamber (27), a fourth purification device (28), a fifth purification device (29) and a sixth purification device (30); The second water supply path (9) passes through the relay pump station (14) and the fifth valve (19), and then passes through the sixth valve (20) to communicate with the fifth purification device (29). One side of the fifth purification device (29) is communicated with the second water collection chamber (27) through a pipeline. The other side of the second water collection chamber (27) passes through the fourth purification device (28) and is connected to the nineteenth valve (21) through a water branch pipe. The other side of the nineteenth valve (21) is connected to the first water supply path (1).

6. A distributed pumped storage system based on a large height difference heating pipe network according to claim 5, characterized in that: The second water collection chamber (27) is connected to the high-level water reservoir (11) after passing through the sixth purification device (30) and the seventh valve (22).

7. A distributed pumped storage system based on a large height difference heating pipe network according to claim 6, characterized in that: The second water supply path (9) is connected to the high-position heating unit (12) via a fourteenth valve (23); the outlet of the high-position heating unit (12) is connected to the first water supply path (1) via a sixteenth valve (24); One end of the first water supply path (1) is connected to the inlet of the low-position heating unit (13) through a pipeline via an eighth valve (25), and the outlet pipeline of the low-position heating unit (13) is connected to the second water supply path (9) via a ninth valve (26).

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