CN219980496U - Energy storage system - Google Patents

Abstract

The utility model provides an energy storage system, which comprises a power generation unit, an energy storage unit and an application unit, wherein the power generation unit is connected with the energy storage unit; the power generation unit is connected with the power utilization module in the application unit so as to supply power to the power utilization module; the energy storage unit comprises a heat energy storage unit and a hydrogen energy storage unit, the heat energy storage unit comprises a heat energy storage module, a steam generator and a steam turbine, the heat energy storage module is used for storing heat, the heat output end of the heat energy storage module is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the output shaft of the steam turbine is connected with the power supply end of the power utilization module. The utility model reduces the energy storage operation cost, improves the energy utilization rate of the system and achieves the aim of multi-energy complementary energy storage.

Description

Energy storage system

Technical Field

The utility model relates to the technical field of energy storage, in particular to an energy storage system.

Background

In recent years, along with the change of the energy industry in China, the energy development power is changed from the traditional energy industry to the new energy industry, and the energy structure is changed from raw coal power generation to diversified and clean power generation. Therefore, the development of green energy industry has become a necessary way for the conversion of energy structures in China, and photovoltaic, wind power, photo-thermal power generation and the like are used as novel energy industry and are widely applied and popularized at present.

At present, more energy storage methods, such as pumped storage and electrochemical energy storage, are used, and all the commonly applied energy storage modes have the function of energy storage.

However, although the energy storage methods can achieve the purpose of energy storage, the energy storage facilities of the method have longer construction period, higher construction cost and later operation and maintenance, larger energy loss in the energy storage process and lower power generation conversion rate of the whole system.

Disclosure of Invention

In view of the above problems, the utility model provides an energy storage system, which reduces the energy storage operation cost, improves the energy utilization rate of the system and achieves the aim of multi-energy complementary energy storage.

In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions:

the embodiment of the utility model provides an energy storage system, which comprises a power generation unit, an energy storage unit and an application unit;

the power generation unit is connected with the power utilization module in the application unit so as to supply power to the power utilization module;

the energy storage unit comprises a heat energy storage unit and a hydrogen energy storage unit, the heat energy storage unit comprises a heat energy storage module, a steam generator and a steam turbine, the heat energy storage module is used for storing heat, the heat output end of the heat energy storage module is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the output shaft of the steam turbine is connected with the power supply end of the power utilization module;

the hydrogen energy storage unit comprises a hydrogen energy storage module and a power generation module, the hydrogen energy storage module is used for storing hydrogen energy, the hydrogen energy output end of the hydrogen energy storage module is connected with the hydrogen energy input end of the power generation module, and the power generation end of the power generation module is connected with the power supply end of the power utilization module.

The beneficial effects of the utility model are as follows: through the arrangement of the power generation unit, the energy storage unit and the application unit, the coordination and complementation can realize the conversion, storage and transportation of abundant electric quantity in the power generation system, the energy storage operation cost is reduced on the premise of guaranteeing clean energy storage, the energy utilization rate of the system is improved, the aim of multi-energy complementation energy storage is really realized, the stability of a power grid is effectively improved, and the power grid has wider application value.

On the basis of the technical scheme, the utility model can be improved as follows.

In some alternative embodiments, the hot energy storage module includes a cold melt salt storage tank, a hot salt pump, and a hot molten salt storage tank, the hot salt pump being connected between the power generation unit and the hot molten salt storage tank and between the cold melt salt storage tank and the hot molten salt storage tank, a heat input end of the hot molten salt storage tank being connected to a heat output end of the cold melt salt storage tank, the hot salt pump being configured to pump heat of the cold melt salt storage tank into the cold melt salt storage tank;

the heat output end of the hot molten salt storage tank is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the heat output end of the steam generator is connected with the heat input end of the cold molten salt storage tank.

In some alternative embodiments, the thermal energy storage module further comprises a first thermal energy storage module and a second thermal energy storage module that are connected to each other, and the heat output ends of the first thermal energy storage module and the second thermal energy storage module are connected to the air inlet end of the steam generator.

In some alternative embodiments, the first thermal energy storage module comprises an electric heater configured to generate heat, the heat input of the cold molten salt storage tank being connected to the heat output of the electric heater, the electric heater being connected between the heat output of the cold molten salt storage tank and the heat input of the hot molten salt storage tank.

In some alternative embodiments, the second thermal energy storage module comprises a heliostat configured to reflect solar energy to the photo-thermal tower such that the photo-thermal tower generates heat, and a heat input of the cold melt salt storage tank is connected to a heat output of the photo-thermal tower.

In some alternative embodiments, the second thermal energy storage module further comprises a cold salt pump located between the cold melt salt storage tank and the photo-thermal tower and configured to pump the cold molten salt of the cold melt salt storage tank into the photo-thermal tower.

In some alternative embodiments, the second thermal energy storage module further comprises a turbine and a generator, an input shaft of the turbine is connected to the energy output of the photo-thermal tower, an output shaft of the turbine is connected to an input shaft of the generator, and input shafts of the cold salt pump and the hot salt pump are connected to an output shaft of the generator.

In some alternative embodiments, the hydrogen storage module includes an electrolyzer configured to produce hydrogen, a hydrogen compressor configured to be connected to an outlet end of the electrolyzer to draw gas from the outlet end of the electrolyzer into the hydrogen compressor and store the gas into the hydrogen storage tank, and a hydrogen storage tank in communication between the outlet end of the hydrogen compressor and an inlet end of the power generation module.

In some alternative embodiments, the power generation module includes a fuel cell and a micro gas turbine, the air inlet ends of the fuel cell and the micro gas turbine are connected to the air outlet end of the hydrogen storage tank, and the power generation ends of the fuel cell and the micro gas turbine are connected to the power supply end of the power utilization module.

In some alternative embodiments, the thermal energy storage unit further comprises a condenser, and the application unit comprises an industrial water supply module and a heating module;

the steam generator, the industrial water supply module and the water inlet end of the condenser are connected with the water outlet end of the fuel cell, and the water outlet ends of the condenser and the micro gas turbine are connected with the water inlet end of the heating module, so that hot water in the condenser and the micro gas turbine is used for heating the heating module;

the water inlet ends of the industrial water supply module and the electrolytic tank are connected with the water outlet end of the heating module, so that the cold water after heat supply flows into the industrial water supply module and the electrolytic tank.

The energy storage system provided by the embodiment of the utility model comprises a power generation unit, an energy storage unit and an application unit; the power generation unit is connected with the power utilization module in the application unit so as to supply power to the power utilization module; the energy storage unit comprises a heat energy storage unit and a hydrogen energy storage unit, the heat energy storage unit comprises a heat energy storage module, a steam generator and a steam turbine, the heat energy storage module is used for storing heat, the heat output end of the heat energy storage module is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the output shaft of the steam turbine is connected with the power supply end of the power utilization module; the hydrogen energy storage unit comprises a hydrogen energy storage module and a power generation module, the hydrogen energy storage module is used for storing hydrogen energy, the hydrogen energy output end of the hydrogen energy storage module is connected with the hydrogen energy input end of the power generation module, and the power generation end of the power generation module is connected with the power supply end of the power utilization module.

Through the arrangement of the power generation unit, the energy storage unit and the application unit, the coordination and complementation can realize the conversion, storage and transportation of abundant electric quantity in the power generation system, the energy storage operation cost is reduced on the premise of guaranteeing clean energy storage, the energy utilization rate of the system is improved, the aim of multi-energy complementation energy storage is really realized, the stability of a power grid is effectively improved, and the power grid has wider application value.

In addition to the technical problems, technical features constituting the technical solutions, and beneficial effects caused by the technical features of the technical solutions described above, other technical problems that can be solved by the energy storage system provided by the embodiment of the present utility model, other technical features included in the technical solutions, and beneficial effects caused by the technical features of the technical solutions, further detailed description will be made in the detailed description of the present utility model.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a thermal energy storage unit in an energy storage system according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a hydrogen storage unit in an energy storage system according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of an application unit in an energy storage system according to an embodiment of the present utility model.

Reference numerals illustrate:

a 100-energy storage system;

110-a power generation unit;

111-wind-light power generation area;

112-power transmission lines;

120-a thermal energy storage unit;

121-a thermal energy storage module;

1211-a cold melt salt storage tank;

1212-a hot salt pump;

1213-a hot molten salt storage tank;

1214-electric heaters;

1215-heliostats;

1216-a photothermal column;

1217-a cold salt pump;

1218-a turbine;

1219-generator;

122-a steam generator;

123-steam turbine;

124-a condenser;

130-a hydrogen storage unit;

131-a hydrogen storage module;

1311-an electrolysis cell;

1312-a hydrogen compressor;

1313-hydrogen storage tank;

132-a power generation module;

1321-a fuel cell;

1322—a micro gas turbine;

140-an application unit;

141-building electricity facilities;

142-traffic electrical facilities;

143-industrial electrical facilities;

144-an industrial water supply module;

145-heating module.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. All other embodiments obtained fall within the scope of protection of the present utility model. The following embodiments and features of the embodiments may be combined with each other without conflict.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

At present, more energy storage methods, such as pumped storage and electrochemical energy storage, are used, and all the commonly applied energy storage modes have the function of energy storage. However, although the energy storage methods can achieve the purpose of energy storage, the energy storage facilities of the method have longer construction period, higher construction cost and later operation and maintenance, larger energy loss in the energy storage process and lower power generation conversion rate of the whole system.

In order to overcome the defects in the prior art, the energy storage system provided by the utility model can realize the conversion, storage and transportation of abundant electric quantity in the power generation system by means of coordination and complementation through the arrangement of the power generation unit, the energy storage unit and the application unit, reduces the energy storage operation cost on the premise of guaranteeing clean energy storage, improves the energy utilization rate of the system, truly realizes the aim of multi-energy complementary energy storage, effectively improves the stability of a power grid, and has wider application value.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The present utility model will be described in detail with reference to the accompanying drawings so that those skilled in the art can more clearly understand the present utility model.

Fig. 1 is a schematic diagram of an energy storage system according to an embodiment of the present utility model, fig. 2 is a schematic diagram of a thermal energy storage unit in an energy storage system according to an embodiment of the present utility model, fig. 3 is a schematic diagram of a hydrogen energy storage unit in an energy storage system according to an embodiment of the present utility model, and fig. 4 is a schematic diagram of an application unit in an energy storage system according to an embodiment of the present utility model.

As shown in fig. 1 to 4, an embodiment of the present utility model provides an energy storage system 100, including a power generation unit 110, an energy storage unit, and an application unit 140;

the power generation unit 110 is connected with the power use module in the application unit 140 to supply power to the power use module.

It should be noted that, the power generation unit 110 includes a wind-light power generation area 111 and a power transmission line 112, the wind-light power generation area 111 may be connected to a power consumption module through the power transmission line 112, and when the power consumption is high, the electric quantity generated by the wind-light power generation area 111 may be connected to the power consumption module through the power transmission line 112, so as to implement frequency modulation and peak regulation of the power consumption module.

The electricity consumption module may be, for example, a building electricity consumption facility 141, a traffic electricity consumption facility 142, or an industrial electricity consumption facility 143, and the embodiments are not limited thereto.

It is to be understood that the power generation unit 110 may be a photovoltaic power generation system, a wind power generation system, or the like, and is not limited herein.

Specifically, wind energy and light energy are converted into electric energy through the wind-light power generation area 111 in the power generation unit 110, and the electric energy is transmitted to the building electric facility 141, the traffic electric facility 142 and the industrial electric facility 143 through the power transmission line 112 for electric quantity absorption, and the module mainly completes collection, conversion and absorption of the electric energy.

The energy storage unit includes a heat energy storage unit 120 and a hydrogen energy storage unit 130, the heat energy storage unit 120 includes a heat energy storage module 121, a steam generator 122 and a steam turbine 123, the heat energy storage module 121 is used for storing heat, a heat output end of the heat energy storage module 121 is connected with an air inlet end of the steam generator 122, an air outlet end of the steam generator 122 is connected with an air inlet end of the steam turbine 123, and an output shaft of the steam turbine 123 is connected with a power supply end of the power utilization module.

It should be noted that the energy storage unit is mainly used for: when the electric power is not consumed, the surplus electric power is converted and stored by the thermal energy storage unit 120 and the hydrogen energy storage unit 130.

Specifically, when the electric power is not consumed, the thermal energy storage unit 120 is used to store the heat that is not consumed, so that the heat can be used later, thereby completing the conversion and storage of the electric power-thermal energy.

When the electric quantity of the power grid is insufficient in daytime or the electric quantity required at night is increased, the stored heat energy can be converted and output, and the specific mode is as follows: the heat stored in the heat storage unit 120 may be used in the operation of the steam generator 122, so that the steam generator 122 may generate steam, and the generated steam enters the steam turbine 123 through the air inlet end of the steam turbine 123 to drive the steam turbine 123 to operate, and then the steam turbine 123 generates electricity, and the generated electricity is transmitted to the building electricity facility 141, the traffic electricity facility 142, the industrial electricity facility 143, and the like in the electricity module.

The hydrogen energy storage unit 130 includes a hydrogen energy storage module 131 and a power generation module 132, the hydrogen energy storage module 131 is used for storing hydrogen energy, a hydrogen energy output end of the hydrogen energy storage module 131 is connected with a hydrogen energy input end of the power generation module 132, and a power generation end of the power generation module 132 is connected with a power supply end of the power utilization module.

Specifically, when the electric power is not consumed, the hydrogen storage unit 130 is used to store the energy that is not consumed, so that the subsequent use is facilitated, thereby completing the conversion and storage of the electric power-hydrogen energy.

When the electric quantity of the power grid is insufficient in daytime or the electric quantity required at night is increased, the stored hydrogen energy can be converted and output, and the specific mode is as follows: the hydrogen energy storage module 131 stores hydrogen energy, and the power generation module 132 sucks hydrogen gas to generate power, and the generated power is transmitted to the building power utilization facility 141, the traffic power utilization facility 142, the industrial power utilization facility 143, and the like in the power utilization module.

It should be noted that, the thermal energy storage unit 120 and the hydrogen energy storage unit 130 in the energy storage unit, both of storing thermal energy in the thermal energy storage unit 120 and storing hydrogen energy in the hydrogen energy storage unit 130, are mainly used for completing the conversion of the stored energy and the peak shaving of the power grid.

Through the arrangement, namely, through the arrangement of the power generation unit 110, the energy storage unit and the application unit 140, the coordination and complementation can realize the conversion, storage and transportation of abundant electric quantity in the power generation system, and on the premise of guaranteeing clean energy storage, the energy storage operation cost is reduced, the energy utilization rate of the system is improved, the aim of multi-energy complementation energy storage is truly realized, the stability of a power grid is effectively improved, and the power grid has wider application value.

As shown in fig. 1-4, in some alternative embodiments, the hot energy storage module 121 includes a cold melt salt storage tank 1211, a hot salt pump 1212, and a hot melt salt storage tank 1213, the hot salt pump 1212 being connected between the power generation unit 110 and the hot melt salt storage tank 1213 and located between the cold melt salt storage tank 1211 and the hot melt salt storage tank 1213, the heat input of the hot melt salt storage tank 1213 being connected to the heat output of the cold melt salt storage tank 1211, the hot salt pump 1212 being configured to pump heat from the cold melt salt storage tank 1211 into the cold melt salt storage tank 1211;

the heat output end of the hot molten salt storage tank 1213 is connected with the air inlet end of the steam generator 122, the air outlet end of the steam generator 122 is connected with the air inlet end of the steam turbine 123, and the heat output end of the steam generator 122 is connected with the heat input end of the cold molten salt storage tank 1211.

It will be appreciated that after the cold salt delivered by the cold molten salt storage tank 1211 absorbs heat, the hot salt pump 1212 pumps it into the hot molten salt storage tank 1213 and stores it in the hot molten salt storage tank 1213, thereby completing the storage of thermal energy.

During electricity utilization peaks, hot salt stored in the hot molten salt storage tank 1213 is conveyed to the steam generator 122 to realize heat conveying, and the steam generator 122 generates a large amount of steam through the heat conveyed by the hot molten salt storage tank 1213 and drives the steam turbine 123 to do work, so that the steam turbine 123 is driven to generate electricity, and the conversion from heat energy to electric energy is realized. In this process, the generated electricity is transmitted to the building electricity facilities 141, the traffic electricity facilities 142, the industrial electricity facilities 143, and the like in the electricity module through the lines.

In this embodiment, when the thermal energy storage module 121 releases energy, the thermal salt stored in the thermal molten salt storage tank 1213 can provide heat for the steam generator 122, so as to reduce the input of external energy, realize multiple utilization of energy, improve the energy utilization efficiency, and reduce the energy storage cost.

It should be noted that, the cold molten salt storage tank 1211, the hot salt pump 1212 and the hot molten salt storage tank 1213 are all provided with a pipeline, and the two are connected through the pipeline, specifically, the size and length of the pipeline can be adjusted according to the actual situation, and the embodiment of the utility model is not limited in this way.

As shown in fig. 1 to 4, in some alternative embodiments, the heat storage module 121 further includes a first heat storage module 121 and a second heat storage module 121 connected to each other, and heat output ends of the first heat storage module 121 and the second heat storage module 121 are connected to an air inlet end of the steam generator 122.

It is understood that the first thermal energy storage module 121 and the second thermal energy storage module 121 may be in two different heat storage modes. The energy storage system can further embody the purpose of multi-energy complementary energy storage of the whole system, and improves the energy utilization rate of the system.

In some alternative embodiments, the first thermal energy storage module 121 includes an electric heater 1214, the electric heater 1214 being configured to generate heat, the heat input of the cold molten salt storage tank 1211 being connected to the heat output of the electric heater 1214, the electric heater 1214 being connected between the heat output of the cold molten salt storage tank 1211 and the heat input of the hot molten salt storage tank 1213.

It should be noted that the first thermal energy storage module 121 may be an electrical heating energy storage module 121.

Specifically, electric energy is mainly converted into heat energy by the electric heater 1214, heat is absorbed by cold salt in the cold molten salt storage tank 1211, and pumped into the hot molten salt storage tank 1213 by the hot salt pump 1212 for storage, so that the heat energy is stored.

It should be noted that, the heat input end of the cold molten salt storage tank 1211, the heat output end of the electric heater 1214, and the heat input end of the hot molten salt storage tank 1213 are all provided with pipelines, and the two are connected through the pipelines, specifically, the size and length of the pipelines can be adjusted according to the actual situation, and the embodiments of the present utility model are not limited in this way too much.

As shown in fig. 1-4, in some alternative embodiments, the second thermal energy storage module 121 includes a heliostat 1215 and a photo-thermal tower 1216, the heliostat 1215 being configured to reflect solar energy to the photo-thermal tower 1216 such that the photo-thermal tower 1216 generates heat, and a heat input of the cold melt salt storage tank 1211 is connected to a heat output of the photo-thermal tower 1216.

It should be noted that the first thermal energy storage module 121 may be a natural heat absorption energy storage module 121.

Specifically, solar energy is mainly reflected to the photo-thermal tower 1216 through the heliostat 1215, cold salt stored in the cold molten salt storage tank 1211 is conveyed to a heat absorber in the photo-thermal tower 1216 to absorb heat, and then hot salt is pumped into the hot molten salt storage tank 1213 through the hot salt pump 1212 to store energy, so that thermal energy is stored.

It should be noted that, the heliostat 1215 and the photo-thermal tower 1216, and the photo-thermal tower 1216 and the cold molten salt storage tank 1211 are respectively provided with a pipeline, and the heliostat 1215 and the photo-thermal tower 1216 are connected through the pipelines, and specifically, the size and the length of the pipeline can be adjusted according to the actual situation, and the embodiment of the utility model is not limited in this way.

As shown in fig. 1-4, in some alternative embodiments, the second thermal energy storage module 121 further includes a cold salt pump 1217, the cold salt pump 1217 being located between the cold melt salt storage tank 1211 and the photo-thermal tower 1216 and configured to pump the cold molten salt of the cold melt salt storage tank 1211 into the photo-thermal tower 1216.

Specifically, solar energy is mainly reflected to the photo-thermal tower 1216 through the heliostat 1215, cold salt stored in the cold molten salt storage tank 1211 is conveyed to a heat absorber in the photo-thermal tower 1216 through the cold salt pump 1217 to absorb heat, and then hot salt is pumped to the hot molten salt storage tank 1213 through the hot salt pump 1212 to store energy, so that thermal energy is stored.

It should be noted that, the cold salt pump 1217 and the cold molten salt storage tank 1211, and the cold salt pump 1217 and the photo-thermal tower 1216 are all provided with pipelines, and the two are connected through the pipelines, and specifically, the size and length of the pipelines can be adjusted according to the actual situation, and the embodiments of the present utility model are not limited in this way.

As shown in fig. 1-4, in some alternative embodiments, the second thermal energy storage module 121 further comprises a turbine 1218 and a generator 1219, the input shaft of the turbine 1218 being connected to the energy output of the photo-thermal tower 1216, the output shaft of the turbine 1218 being connected to the input shaft of the generator 1219, the input shafts of the cold salt pump 1217 and the hot salt pump 1212 being connected to the output shaft of the generator 1219.

Specifically, when cold molten salt in the cold molten salt storage tank 1211 absorbs heat and is conveyed to the bottom of the photo-thermal tower 1216 from the top of the photo-thermal tower 1216, a turbine 1218 is arranged in a molten salt conveying pipeline at the bottom of the photo-thermal tower 1216, and the hot molten salt pushes the turbine 1218 to convert gravitational potential energy into kinetic energy in the flowing process and pushes a generator 1219 to generate electricity, and the generated electricity is conveyed to a cold salt pump 1217 and a hot salt pump 1212 to continuously work.

It should be noted that, the turbine 1218 collects and converts the potential energy generated by downward transmission of the hot molten salt from the top of the photo-thermal tower 1216, and provides the converted electric energy to the cold salt pump 1217 and the hot salt pump 1212, so that the energy utilization rate of the energy storage unit is improved, and the running cost of the system is reduced.

In addition, the input shaft of the turbine 1218 and the energy output end of the photo-thermal tower 1216, the output shaft of the turbine 1218 and the input shaft of the generator 1219, and the input shafts of the cold salt pump 1217 and the hot salt pump 1212 and the output shaft of the generator 1219 are all provided with pipelines, and the two are connected through the pipelines, specifically, the size and length of the pipelines can be adjusted according to the actual situation, and the embodiment of the present utility model is not limited in this way.

As shown in fig. 1-4, in some alternative embodiments, the hydrogen storage module 131 includes an electrolysis cell 1311, a hydrogen compressor 1312, and a hydrogen storage tank 1313, the electrolysis cell 1311 is configured to produce hydrogen, the hydrogen compressor 1312 is configured to be connected to an outlet end of the electrolysis cell 1311 to draw gas from the outlet end of the electrolysis cell 1311 into the hydrogen compressor 1312 and store the gas into the hydrogen storage tank 1313, and the hydrogen storage tank 1313 is in communication between the outlet end of the hydrogen compressor 1312 and an inlet end of the power generation module 132.

Meanwhile, the electric power which is not consumed is used for supplying to the electrolytic tank 1311 for producing hydrogen, the produced hydrogen is stored in the hydrogen storage tank 1313 through the hydrogen compressor 1312, and in addition, the electric power transmitted by the power generation unit 110 also provides electric power for the hot salt pump 1212 and the cold salt pump 1217, and the module mainly completes the conversion and storage of the un-consumed electric power.

In addition, it should be noted that, the air outlet end of the electrolytic tank 1311 and the air inlet end of the hydrogen compressor 1312, the air outlet end of the hydrogen compressor 1312 and the air inlet end of the hydrogen storage tank 1313, and the air outlet end of the hydrogen storage tank 1313 and the air inlet end of the power generation module 132 are all provided with pipelines, and the two are connected through the pipelines, specifically, the size and length of the pipelines can be adjusted according to the actual situation, and the embodiments of the present utility model are not limited in this way.

In addition, compared with the single wind power generation, photovoltaic power generation and thermal energy storage system 100, the system can flexibly store redundant electric quantity while supplying power to the urban power grid, and continuously and stably supply power at night, in overcast and rainy days or in the peak period of electric energy demand, so that the stability of the power grid is improved, and the system has a better flexible regulation function to the power grid.

As shown in fig. 1-4, in some alternative embodiments, the power generation module 132 includes a fuel cell 1321 and a micro gas turbine 1322, where the air inlet ends of the fuel cell 1321 and the micro gas turbine 1322 are connected to the air outlet end of the hydrogen storage tank 1313, and the power generation ends of the fuel cell 1321 and the micro gas turbine 1322 are connected to the power supply end of the power utilization module.

The stored hydrogen energy is generated by combustion of the fuel cell 1321 and the micro gas turbine 1322, and the generated electric energy is transmitted to the electric power generation facility 141 for construction, the electric power generation facility 142 for transportation, and the electric power generation facility 143 for industry.

In addition, the air inlet end of the fuel cell 1321 and the air outlet end of the hydrogen storage tank 1313, the air inlet end of the micro gas turbine 1322 and the air outlet end of the hydrogen storage tank 1313, the power generation end of the fuel cell 1321 and the power supply end of the power utilization module, and the power generation end of the micro gas turbine 1322 and the power supply end of the power utilization module are all provided with pipelines, and the two are connected through the pipelines, and in particular, the size and the length of the pipelines can be adjusted according to the actual situation, so that the embodiment of the utility model is not limited in this way.

As shown in fig. 1-4, in some alternative embodiments, the thermal energy storage unit 120 further includes a condenser 124, and the application unit 140 includes an industrial water supply module 144 and a heating module 145.

The water inlet ends of the steam generator 122, the industrial water supply module 144 and the condenser 124 are connected to the water outlet end of the fuel cell 1321, and the water outlet ends of the condenser 124 and the micro gas turbine 1322 are connected to the water inlet end of the heating module 145, so that the hot water in the condenser 124 and the micro gas turbine 1322 heats the heating module 145.

The water inlet ends of the industrial water supply module 144 and the electrolytic tank 1311 are connected with the water outlet end of the heating module 145, so that the cold water after heat supply flows into the industrial water supply module 144 and the electrolytic tank 1311.

It should be noted that, during the energy conversion process of the heat energy storage unit 120 and the hydrogen energy storage unit 130, the water generated during the combustion process of the fuel cell 1321 may supply cold water to the industrial water supply module 144, the steam generator 122, and the condenser 124, the hot water generated by cooling the condenser 124 and the hot water generated by the micro gas turbine 1322 after generating electricity may supply heat to the heating module 145, and the hot water after supplying heat may supply water to the industrial water supply module 144 and the electrolysis tank 1311.

The water generated by the hydrogen energy storage unit 130 in the utility model supplies sufficient water for the steam generator 122, the condenser 124 and the industrial water supply module 144 of the heat energy storage unit 120, meanwhile, the hot water generated by the condenser 124 in the heat energy storage unit 120 and the micro gas turbine 1322 in the hydrogen energy storage unit 130 can supply heat for the heating module 145, and the water after heat supply supplies water for the industrial water supply module 144 and the electrolytic tank 1311, thereby realizing resource complementation of a plurality of systems, improving the energy complementation efficiency of the whole system and reducing the energy loss in the process.

The energy storage system provided by the embodiment of the utility model comprises a power generation unit, an energy storage unit and an application unit; the power generation unit is connected with the power utilization module in the application unit so as to supply power to the power utilization module; the energy storage unit comprises a heat energy storage unit and a hydrogen energy storage unit, the heat energy storage unit comprises a heat energy storage module, a steam generator and a steam turbine, the heat energy storage module is used for storing heat, the heat output end of the heat energy storage module is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the output shaft of the steam turbine is connected with the power supply end of the power utilization module; the hydrogen energy storage unit comprises a hydrogen energy storage module and a power generation module, the hydrogen energy storage module is used for storing hydrogen energy, the hydrogen energy output end of the hydrogen energy storage module is connected with the hydrogen energy input end of the power generation module, and the power generation end of the power generation module is connected with the power supply end of the power utilization module.

Through the arrangement of the power generation unit, the energy storage unit and the application unit, the coordination and complementation can realize the conversion, storage and transportation of abundant electric quantity in the power generation system, the energy storage operation cost is reduced on the premise of guaranteeing clean energy storage, the energy utilization rate of the system is improved, the aim of multi-energy complementation energy storage is really realized, the stability of a power grid is effectively improved, and the power grid has wider application value.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. An energy storage system is characterized by comprising a power generation unit, an energy storage unit and an application unit;

the power generation unit is connected with the power utilization module in the application unit so as to supply power to the power utilization module;

the energy storage unit comprises a heat energy storage unit and a hydrogen energy storage unit, the heat energy storage unit comprises a heat energy storage module, a steam generator and a steam turbine, the heat energy storage module is used for storing heat, the heat output end of the heat energy storage module is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the output shaft of the steam turbine is connected with the power supply end of the power utilization module;

the hydrogen energy storage unit comprises a hydrogen energy storage module and a power generation module, wherein the hydrogen energy storage module is used for storing hydrogen energy, the hydrogen energy output end of the hydrogen energy storage module is connected with the hydrogen energy input end of the power generation module, and the power generation end of the power generation module is connected with the power supply end of the power utilization module.

2. The energy storage system of claim 1, wherein the thermal energy storage module comprises a cold melt salt storage tank, a hot salt pump, and a hot melt salt storage tank, the hot salt pump connected between the power generation unit and the hot melt salt storage tank and located between the cold melt salt storage tank and the hot melt salt storage tank, the hot melt salt storage tank having a heat input connected to a heat output of the cold melt salt storage tank, the hot salt pump configured to pump heat from the cold melt salt storage tank into the cold melt salt storage tank;

the heat output end of the hot molten salt storage tank is connected with the air inlet end of the steam generator, the air outlet end of the steam generator is connected with the air inlet end of the steam turbine, and the heat output end of the steam generator is connected with the heat input end of the cold molten salt storage tank.

3. The energy storage system of claim 2, wherein the thermal energy storage module further comprises a first thermal energy storage module and a second thermal energy storage module that are connected to each other, the heat output ends of the first thermal energy storage module and the second thermal energy storage module being connected to the air intake end of the steam generator.

4. The energy storage system of claim 3, wherein the first thermal energy storage module comprises an electric heater configured to generate heat, the heat input of the cold melt salt storage tank being connected to the heat output of the electric heater, the electric heater being connected between the heat output of the cold melt salt storage tank and the heat input of the hot melt salt storage tank.

5. The energy storage system of claim 4, wherein the second thermal energy storage module comprises a heliostat configured to reflect solar energy to the photo-thermal tower to cause the photo-thermal tower to generate heat, and a heat input of the cold melt salt storage tank is connected to a heat output of the photo-thermal tower.

6. The energy storage system of claim 5, wherein the second thermal energy storage module further comprises a cold salt pump positioned between the cold melt salt storage tank and the photo-thermal tower and configured to pump cold melt salt of the cold melt salt storage tank into the photo-thermal tower.

7. The energy storage system of claim 6, wherein the second thermal energy storage module further comprises a turbine and a generator, an input shaft of the turbine is connected to the energy output of the photo-thermal tower, an output shaft of the turbine is connected to the input shaft of the generator, and input shafts of the cold salt pump and the hot salt pump are connected to the output shaft of the generator.

8. The energy storage system of any of claims 1-7, wherein the hydrogen energy storage module comprises an electrolyzer configured to produce hydrogen, a hydrogen compressor configured to be connected to an outlet end of the electrolyzer to draw gas from the outlet end of the electrolyzer into the hydrogen compressor and store the gas into the hydrogen storage tank, and a hydrogen storage tank in communication between the outlet end of the hydrogen compressor and an inlet end of the power generation module.

9. The energy storage system of claim 8, wherein the power generation module comprises a fuel cell and a micro gas turbine, wherein the air inlet ends of the fuel cell and the micro gas turbine are connected with the air outlet end of the hydrogen storage tank, and the power generation ends of the fuel cell and the micro gas turbine are connected with the power supply end of the power utilization module.

10. The energy storage system of claim 9, wherein the thermal energy storage unit further comprises a condenser, and the application unit comprises an industrial water supply module and a heating module;

the steam generator, the industrial water supply module and the water inlet end of the condenser are connected with the water outlet end of the fuel cell, and the water outlet ends of the condenser and the micro gas turbine are connected with the water inlet end of the heating module, so that hot water in the condenser and the micro gas turbine is used for heating the heating module;

the industrial water supply module and the water inlet end of the electrolytic tank are connected with the water outlet end of the heating module, so that the cold water after heat supply flows into the industrial water supply module and the electrolytic tank.