CN116044529A - Energy storage system and control method thereof - Google Patents
Energy storage system and control method thereof Download PDFInfo
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- CN116044529A CN116044529A CN202310295618.4A CN202310295618A CN116044529A CN 116044529 A CN116044529 A CN 116044529A CN 202310295618 A CN202310295618 A CN 202310295618A CN 116044529 A CN116044529 A CN 116044529A
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- energy storage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to an energy storage system and a control method thereof, wherein the energy storage system comprises an energy release heat exchanger and a turbine, the energy release heat exchanger is connected with the turbine through an air inlet pipeline, and the energy storage system also comprises a heating flow path and an air source flow path, wherein: the heating flow path is communicated with the inlet of the energy release heat exchanger and the outlet of the air inlet pipeline, and comprises a pneumatic unit and a first valve, wherein the first valve is positioned between the pneumatic unit and the turbine; the air source flow path is communicated with the pneumatic unit and is used for generating a power source; when the first valve is opened, the pneumatic unit receives a power source and then starts the engine, and drives gaseous carbon dioxide in the air inlet pipeline to flow back to the energy release heat exchanger for heating; the gas carbon dioxide in the air inlet pipeline is heated to the allowable temperature of the turbine starter, the gas carbon dioxide enters the turbine and cannot cause cold embrittlement of turbine blades, safe, reliable and stable operation of the turbine is ensured, the time of the turbine starter is shortened, and the safe, reliable, efficient and stable energy storage system is ensured, and the quick response and the service life are longer.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an energy storage system and a control method thereof.
Background
Because of the characteristics of intermittence, volatility, peak staggering power generation and the like of clean energy, the energy storage technology becomes one of key technologies for the development of clean energy.
At present, the energy storage technology based on carbon dioxide gas-liquid phase-change circulation utilizes redundant electric power or clean energy to compress and condense gaseous carbon dioxide at normal temperature and normal pressure in a gas storage tank into liquid carbon dioxide to be stored in a storage tank, and stores heat energy generated in the compression process, and utilizes the stored heat energy to heat the liquid carbon dioxide to be gaseous in the electricity utilization peak period, the gaseous carbon dioxide drives a turbine to drive a generator to generate electricity, and the gaseous carbon dioxide after working returns to the gas storage tank for recycling, so that the energy storage technology has the advantages of simple structure, flexible arrangement, higher energy storage efficiency and the like and gradually draws wide attention. However, the temperature of the gaseous carbon dioxide in the air inlet pipeline is reduced along with time after the operation of the turbine is finished, so that low-temperature gaseous carbon dioxide exists in the air inlet pipeline of the turbine, at the moment, the gaseous carbon dioxide of the turbine starter directly enters the turbine for expansion and then is further cooled, the low temperature causes cold embrittlement of turbine blades, the operation safety of the turbine is endangered, and even the reliability, the stability and the service life of the whole energy storage system are influenced.
Therefore, the energy storage system capable of warming the turbine air inlet pipeline before the turbine is started and the control method thereof are technical problems to be solved.
Disclosure of Invention
Based on the above, it is necessary to provide an energy storage system and a control method thereof, which are capable of ensuring the operation safety of the turbine and the energy storage system by refluxing and heating the gaseous carbon dioxide remained in the turbine air inlet pipeline before the turbine is started.
The invention provides an energy storage system, which comprises an energy release heat exchanger and a turbine, wherein the energy release heat exchanger is connected with the turbine through an air inlet pipeline, and the energy storage system also comprises a heating flow path and an air source flow path, wherein:
the heating flow path is communicated with an inlet of the energy release heat exchanger and the air inlet pipeline and comprises a pneumatic unit and a first valve, and the first valve is positioned between the pneumatic unit and the turbine;
the air source flow path is communicated with the pneumatic unit and is used for generating a power source;
when the first valve is opened, the pneumatic unit receives the power source, starts the engine and drives gaseous carbon dioxide in the air inlet pipeline to flow back to the energy release heat exchanger for heating and raising the temperature.
Before the energy storage system works, the first valve is opened, the air source flow path generates a power source, the power source is input to the heating flow path from the air source flow path, the pneumatic unit starts the engine after receiving the power source, the pneumatic unit drives gaseous carbon dioxide in the air inlet pipeline to flow back to the energy release heat exchanger from the air inlet pipeline through the pneumatic unit, the energy release heat exchanger heats the input gaseous carbon dioxide, so that the temperature of the gaseous carbon dioxide in the air inlet pipeline is increased to the turbine engine starting allowable temperature, at the moment, the turbine is in a state of allowing the engine to start, and at the moment, the gaseous carbon dioxide enters the turbine, so that turbine blades cannot be cold and crisp, safe, reliable and stable operation of the turbine can be ensured, meanwhile, the turbine engine starting time can be shortened, response capacity can be improved, and then the safe, reliable, efficient and stable rapid response and long service life of the energy storage system can be ensured.
In one embodiment, the energy storage system further comprises a gas reservoir, the gas source flow path comprises a gas supply conduit, a second valve, and a gas source generation unit, wherein:
the air supply pipeline is sequentially connected with the air storage, the second valve, the air source generating unit and the pneumatic unit;
the gas source generating unit and the turbine are communicated with the gas storage, and the gas source generating unit is used for converting gaseous carbon dioxide from the gas storage into the power source.
In one embodiment, the energy storage system further comprises a shaft seal flow path, the shaft seal flow path comprises a shaft seal pipeline, the shaft seal pipeline is communicated with the gas supply pipeline at the outlet of the gas source generating unit and the turbine, the shaft seal pipeline is used for being conducted when the turbine is started and works, and the power source generated by the gas source generating unit is used as a shaft seal gas source of the turbine.
In one embodiment, the turbine is a multi-stage turbine, the shaft seal pipeline is provided with a plurality of outlets, and the outlets of the shaft seal pipeline are connected with the multi-stage turbine in a one-to-one correspondence manner.
In one embodiment, the pneumatic unit is a pneumatic fan and the power source is compressed gaseous carbon dioxide.
In one embodiment, the energy storage system further comprises an exhaust flow path, the exhaust flow path comprises an exhaust pipeline and a fifth valve, the exhaust pipeline is communicated with the motor chamber of the pneumatic fan and the inlet of the air source generating unit, and when the fifth valve is in the same opening and closing state as the first valve and is opened, the pneumatic fan, the exhaust pipeline, the air source generating unit and the air supply pipeline are in closed loop connection.
In one embodiment, the energy storage system further comprises an energy storage tank, an evaporator and a sixth valve, wherein the energy storage tank, the evaporator and the energy release heat exchanger are sequentially connected, the sixth valve is arranged between an outlet of the evaporator and an inlet of the energy release heat exchanger, and the sixth valve and a main valve of the turbine are opened when the turbine is started and works.
In one embodiment, the energy storage system further comprises a monitoring module comprising a temperature acquisition element and a control assembly, wherein:
the temperature acquisition element is arranged at the inlet of the main valve of the turbine and is used for acquiring temperature data of gaseous carbon dioxide at the outlet of the air inlet pipeline;
the control assembly is in communication connection with the temperature acquisition element, the first valve and the turbine and is used for controlling the first valve and the turbine action according to the obtained temperature data.
In addition, the invention also provides a control method of the energy storage system according to any one of the technical schemes, which comprises the following steps:
step S201, before the turbine is started, a first valve is opened, and a gas source flow path generates a power source;
step S202, a pneumatic unit receives a power source and starts a machine, and drives gaseous carbon dioxide in an air inlet pipeline to flow back to an energy release heat exchanger;
step S203, the energy release heat exchanger heats the input gaseous carbon dioxide;
in step S204, the first valve is closed after the gaseous carbon dioxide in the air inlet pipeline reaches a set temperature, wherein the set temperature is the turbine start-up allowable temperature.
In the control method of the energy storage system, firstly, through step S201, the turbine is not started before energy release begins, the first valve is opened, the air source flow path generates a power source, and the power source is input from the air source flow path to the heating flow path; then, through step S202, after the pneumatic unit receives the power source, the pneumatic unit starts the engine, and the pneumatic unit drives gaseous carbon dioxide in the air inlet pipeline to flow back to the energy release heat exchanger from the air inlet pipeline through the pneumatic unit; then, through step S203, the energy release heat exchanger heats the input gaseous carbon dioxide until the gaseous carbon dioxide in the air inlet pipeline is heated to the allowable temperature of the turbine starter; finally, through step S204, the temperature of the carbon dioxide in the turbine air inlet pipeline and the temperature of the carbon dioxide in the turbine air inlet pipeline reach a set temperature, the set temperature is the allowable temperature of the turbine starter, at the moment, the turbine is in an allowable state, the first valve is closed, the turbine starter is started, and the gaseous carbon dioxide enters the turbine, and the entering of the gaseous carbon dioxide does not influence the turbine blades due to the fact that the temperature of the gaseous carbon dioxide is higher at the moment; the control method of the energy storage system is simple in logic and easy to implement, and can ensure the safety, reliability, high efficiency, stability, quick response and long service life of the energy storage system.
In one embodiment, the control method of the energy storage system is used for controlling the energy storage system according to the above-mentioned technical scheme, the energy storage system further includes a monitoring module, and correspondingly, step S201 in the control method of the energy storage system specifically includes the following steps:
before the turbine is started, a temperature acquisition element acquires and transmits temperature data of gaseous carbon dioxide of an air inlet pipeline;
the control assembly compares the received temperature data with the allowable temperature of the turbine starter, and when the temperature data is smaller than the allowable temperature of the turbine starter, the first valve is opened, and the air source flow path generates a power source; when the temperature data is greater than the allowable temperature of the turbine starter, the turbine starter and the first valve are closed.
Drawings
FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of the energy storage system according to an embodiment of the invention.
Reference numerals:
10. an energy storage system; 101. an air intake duct;
100. an energy release heat exchanger;
200. a turbine; 210. a main valve;
300. a heating flow path; 310. a pneumatic unit; 320. a first valve; 330. a first pipe;
400. an air source flow path; 410. an air supply duct; 420. a second valve; 430. an air source generating unit;
500. a gas storage;
600. a shaft seal flow path; 610. a shaft seal tube; 620. a third valve; 630. a fourth valve;
700. an exhaust flow path; 710. an exhaust duct; 720. a fifth valve;
810. an energy storage tank; 820. an evaporator; 830. a sixth valve; 840. and a second pipe.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, 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 invention 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 invention.
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 invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, 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 invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, 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.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The following describes the technical scheme provided by the embodiment of the invention with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an energy storage system 10 for energy storage based on carbon dioxide gas-liquid phase circulation, wherein the energy storage system 10 comprises an energy release heat exchanger 100 and a turbine 200, and the energy release heat exchanger 100 is connected with the turbine 200 through an air inlet pipeline 101. In order to heat the gaseous carbon dioxide remaining in the air intake pipe 101 before the turbine 200 is started up, so that the temperature of the gaseous carbon dioxide entering the turbine 200 is higher, and the occurrence of the phenomenon of blade friability of the turbine 200 is avoided, the energy storage system 10 is improved, the improved energy storage system 10 is added with a heating flow path 300 and an air source flow path 400 for heating the air intake pipe 101, and as specific structures of the energy release heat exchanger 100, the turbine 200, the air storage 500, the air storage 810 and the evaporator 820 are not improved, existing structures such as an air storage (the air storage 500 of the invention), an air storage (the air storage 810 of the invention), an evaporator (the evaporator 820 of the invention), a first energy release heat exchanger (the energy release heat exchanger 100 of the invention) and a first expander (the turbine 200 of the invention) in the prior patent CN112985145B and CN114109549B, an evaporator (the air storage 500 of the invention), an evaporator (the air storage 810 of the invention), an evaporator (the evaporator 820) and an energy release heat exchanger (the invention) of the prior patent CN112985143B, CN112985144B can be adopted.
In the energy storage system 10, a heating flow path 300 is communicated with an inlet of the energy release heat exchanger 100 and the air inlet pipeline 101, the heating flow path 300 comprises a pneumatic unit 310 and a first valve 320, and the first valve 320 is positioned between the pneumatic unit 310 and the turbine 200; in a specific arrangement, the first valve 320 may be a structural member such as an electromagnetic valve, a hydraulic valve, a pneumatic valve, etc., and the following valve of the present invention also adopts a structural member such as an electromagnetic valve, a hydraulic valve, a pneumatic valve, etc. The air source flow path 400 is communicated with the pneumatic unit 310, and the air source flow path 400 is used for generating a power source which is used for driving the pneumatic unit 310 to act; when the first valve 320 is opened, the pneumatic unit 310 receives the power source and starts the engine, and the pneumatic unit 310 drives the gaseous carbon dioxide in the air inlet pipeline 101 to flow back to the energy release heat exchanger 100 for heating and raising the temperature.
When the energy storage system 10 works, before energy release starts, the first valve 320 is opened, the air source flow path 400 generates a power source, the power source is input from the air source flow path 400 to the heating flow path 300, the air unit 310 starts up after receiving the power source, the air unit 310 drives gaseous carbon dioxide in the air inlet pipeline 101 to flow back to the energy release heat exchanger 100 from the air inlet pipeline 101 through the air unit 310, the energy release heat exchanger 100 heats the input gaseous carbon dioxide, so that the temperature of the gaseous carbon dioxide in the air inlet pipeline 101 is raised to the turbine 200 start-up allowable temperature, at this time, the turbine 200 is in a state allowing the start-up, and at this time, the gaseous carbon dioxide enters the turbine 200 and can not cause cold brittleness of blades of the turbine 200, so that safe, reliable and stable operation of the turbine 200 can be ensured, at the same time, the start-up time of the turbine 200 can be shortened, the response capacity can be improved, and the safe, reliable, efficient and stable, quick response and long service life of the energy storage system 10 can be ensured.
The gas source flow path 400 has various structural forms, and in a preferred embodiment, as shown in fig. 1, the energy storage system 10 further includes a gas storage 500, where gaseous carbon dioxide is stored in the gas storage 500, and the gas source flow path 400 includes a gas supply pipe 410, a second valve 420, and a gas source generating unit 430, where: the gas supply pipe 410 is sequentially connected with the gas storage 500, the second valve 420, the gas source generating unit 430 and the pneumatic unit 310; the open and close states of the second valve 420 and the first valve 320 are the same, when the first valve 320 is opened, the second valve 420 is simultaneously opened, and when the first valve 320 is closed, the second valve 420 is simultaneously closed; the gas source generating unit 430 and the turbine 200 are respectively communicated with the gas storage 500, the gaseous carbon dioxide output by the turbine 200 flows into the gas storage 500, and the gas source generating unit 430 is used for converting the gaseous carbon dioxide from the gas storage 500 into a power source when the second valve 420 is opened, so that the power source can be conveniently obtained, the gaseous carbon dioxide can be recycled, and the utilization rate is improved. When specifically arranged, the air source generating unit 430 may be a compressor, or may be other structural forms capable of meeting requirements, so long as the conversion of gaseous carbon dioxide into carbon dioxide with pressure can be realized as a power source; moreover, the gas supply pipe 410 is not limited to be connected to the outlet of the gas storage 500, but may be connected to a pipe between the turbine 200 and the gas storage 500.
The power source generated by the air source generating unit 430 is not limited to the operation of the air driving unit 310 before the start of the turbine 200, so that the gaseous carbon dioxide in the air inlet pipeline 101 is heated to the allowable temperature of the start of the turbine 200, and the shaft seal in the start and energy release stages of the turbine 200 can be realized, specifically, as shown in fig. 1, the energy storage system 10 further comprises a shaft seal flow path 600, the shaft seal flow path 600 comprises a shaft seal pipeline 610, the shaft seal pipeline 610 is communicated with the air supply pipeline 410 at the outlet of the air source generating unit 430 and the turbine 200, the shaft seal pipeline 610 is used for being conducted when the start and the operation of the turbine 200 are performed, and the power source generated by the air source generating unit 430 is used as the shaft seal air source of the turbine 200. In a specific arrangement, the shaft seal flow path 600 further includes a third valve 620 and a fourth valve 630, the third valve 620 is in communication with the air source generating unit 430 via the shaft seal pipe 610, the third valve 620 is configured to be opened when the turbine 200 is started, and the third valve 620 is kept opened when the turbine 200 is operated, and the power source is used as the shaft seal air source of the turbine 200. The fourth valve 630 is disposed on the air supply pipe 410 at the outlet of the air supply generating unit 430, the fourth valve 630 is opposite to the open/close state of the third valve 620, the fourth valve 630 is used for opening before the turbine 200 is started and the fourth valve 630 is opened to communicate the air supply generating unit 310 and the air supply generating unit 430, when the fourth valve 630 is opened, the third valve 620 is closed, the power source generated by the air supply generating unit 430 is used for starting the air supply generating unit 310, when the fourth valve 630 is closed, the third valve 620 is opened, and the power source generated by the air supply generating unit 430 is used for shaft sealing of the turbine 200. By providing the shaft seal flow path 600 so that the air supply flow path 400 can be not only fitted with the heating flow path 300 for heating the air intake pipe 101 before the turbine 200 is started, but also the shaft seal of the turbine 200 can be realized at the start of the turbine 200 and at the energy release stage, and in order to realize this function, it is noted that the third valve 620 and the fourth valve 630 can be replaced with a three-way valve which is provided at the outlet of the air supply generation unit 430 and one outlet is connected with the air supply pipe 410 and the other outlet is connected with the shaft seal pipe 610 to realize alternative conduction of the shaft seal flow path 600 and the air supply flow path 400.
The turbine 200 may have various structural forms, and the turbine 200 may be a primary turbine, in which case the shaft seal pipe 610 has an outlet, and the outlet of the shaft seal pipe 610 is connected to the turbine 200 to shaft seal the turbine 200 through the power source discharged from the gas source generating unit 430 during the energy release stage. The turbine 200 may also be a multi-stage turbine, where the shaft seal pipe 610 has a plurality of outlets, and the plurality of outlets of the shaft seal pipe 610 are connected to the multi-stage turbine in a one-to-one correspondence manner, so that the power source discharged through the air source generating unit 430 performs shaft sealing on the multi-stage turbine in the energy release stage, for example, when the turbine 200 has a two-stage turbine structure, the power source realizes a high-pressure turbine shaft seal and a low-pressure turbine shaft seal, respectively.
The pneumatic unit 310 may have various structural forms, and in a preferred embodiment, as shown in fig. 1, the pneumatic unit 310 may be a pneumatic fan, the power source is a high-speed air flow, and the high-speed air flow is compressed air or the high-speed air flow is compressed gaseous carbon dioxide. When the high-speed air flow is compressed gaseous carbon dioxide, the energy storage working medium of the energy storage system can be utilized, and when the high-speed air flow is specifically set, the air inlet pipeline 101, the first valve 320, the pneumatic fan and the energy release heat exchanger 100 are sequentially connected through the first pipeline 330. According to the venturi principle, a small amount of high-speed air flow can start the pneumatic fan after passing through the pneumatic fan, and the pneumatic fan can drive gaseous carbon dioxide in the air inlet pipeline 101 to enter the energy release heat exchanger 100 through the pneumatic fan. Of course, the structure of the pneumatic unit 310 is not limited thereto, and may be in other forms as required.
In order to reduce the working medium waste of the energy storage system 10, specifically, as shown in fig. 1, the energy storage system 10 further includes an exhaust flow path 700, the exhaust flow path 700 includes an exhaust pipe 710 and a fifth valve 720, the exhaust pipe 710 is communicated with a motor chamber of the pneumatic fan and an inlet of the air source generating unit 430, the fifth valve 720 and the first valve 320 have the same open-close state, and when the air inlet temperature of the turbine 200 does not reach the opening state of the fifth valve 720 before the opening state, the pneumatic fan, the exhaust pipe 710, the air source generating unit 430 and the air supply pipe 410 are connected in a closed loop to form an exhaust loop of gaseous carbon dioxide, so as to maintain the continuous operation of the pneumatic unit 310 before the air inlet temperature of the turbine 200 does not reach the opening state. Because the energy storage working medium of the whole energy storage system 10 is carbon dioxide all the time, when the gaseous carbon dioxide in the heating flow path 300 leaks into the motor chamber of the pneumatic fan, the motor chamber is provided with the gaseous carbon dioxide, at the moment, the fifth valve 720 is opened, and the gaseous carbon dioxide in the pneumatic motor chamber of the pneumatic fan is discharged to the air source generating unit 430 so that the air source generating unit 430 can recycle the gaseous carbon dioxide or flow back to the air storage 500, thereby effectively reducing the working medium waste of the energy storage system 10.
In order to improve the reliability of the energy storage system 10, in a preferred embodiment, as shown in fig. 1, the energy storage system 10 further includes an energy storage tank 810, an evaporator 820, and a sixth valve 830, where the energy storage tank 810 stores gaseous carbon dioxide and liquid carbon dioxide, and the evaporator 820 performs evaporation treatment on the liquid carbon dioxide. The energy storage tank 810, the evaporator 820 and the inlet of the energy release heat exchanger 100 are sequentially connected through the second pipe 840, the sixth valve 830 is disposed between the outlet of the evaporator 820 and the inlet of the energy release heat exchanger 100, the sixth valve 830 and the main valve 210 of the turbine 200 are opened when the turbine 200 is started and operated, and in a specific setting, the valve 320 is opened after the air inlet temperature of the turbine 200 reaches the start condition. Before the turbine 200 starts to operate, the sixth valve 830 and the main valve 210 are closed, the first valve 320, the second valve 420, the fourth valve 630 and the fifth valve 720 are all opened, the gas source generating unit 430 converts the gaseous carbon dioxide input from the gas storage 500 into a power source, the power source enters the pneumatic unit 310 to enable the heating flow path 300 to start operating, and if the gaseous carbon dioxide in the heating flow path 300 leaks into a motor chamber of the pneumatic fan at this time, the pneumatic motor of the pneumatic fan discharges the gaseous carbon dioxide in the motor chamber to the gas source generating unit 430 for recycling; when the temperature of the gaseous carbon dioxide in the air inlet pipeline 101 is raised to the allowable temperature of the turbine 200, the turbine 200 is started, at this time, the first valve 320, the fourth valve 630 and the fifth valve 720 are closed, the second valve 420 is kept in an open state, the sixth valve 830 and the main valve 210 are opened, the energy release is started, the third valve 620 is opened, the air source generating unit 430 converts the gaseous carbon dioxide input from the air storage 500 into a power source to enter the turbine 200 for shaft sealing, and the shaft sealing of the turbine 200 is realized in the turbine 200 starting and energy release stages by arranging the shaft sealing flow path 600. In the energy storage system 10, the sixth valve 830 is provided to accurately control the temperature rise of carbon dioxide in the air inlet pipe 101 of the turbine 200, the start-up of the turbine 200, and the start-up of the energy release stage, so as to avoid the collision of the stages and improve the reliability of the energy storage system 10.
To improve the accuracy of the heating coil, in a preferred embodiment, the energy storage system 10 further comprises a monitoring module comprising a temperature acquisition element and a control assembly, wherein: the temperature acquisition element is arranged at the inlet of the main valve 210 of the turbine 200 and is used for acquiring temperature data of gaseous carbon dioxide of the air inlet pipeline 101; the control assembly is respectively connected with the temperature acquisition element, the first valve 320 and the turbine 200 through cable communication, and the control assembly is used for controlling the first valve 320 and the turbine 200 to act according to the obtained temperature data. When the temperature acquisition element is specifically arranged, the temperature acquisition element can be in a structure of a temperature sensor, a thermocouple, a thermal resistor and the like, and can also be in other forms capable of meeting the requirements; the control component can be a PLC, a control panel and other structures, and can also be in other forms capable of meeting the requirements. Before the turbine 200 is started, the temperature acquisition element accurately acquires temperature data of the gaseous carbon dioxide in the air inlet pipeline 101, and the control component accurately controls the opening and closing of the first valve 320 and whether the turbine 200 is started or not according to the acquired temperature data of the gaseous carbon dioxide.
In addition, as shown in fig. 2, the present invention further provides a control method of the energy storage system 10 according to any one of the above technical solutions, including the following steps:
step S201, before the turbine 200 is started, a first valve 320 is opened, and a gas source flow path 400 generates a power source; in a specific arrangement, step S201 is performed before the turbine 200 is started, and if the temperature of the gaseous carbon dioxide in the air intake pipe 101 of the turbine 200 is lower than the allowable temperature for starting the turbine 200, the air source generating unit 430 generates a power source by using the gaseous carbon dioxide input from the air reservoir 500.
Step S202, the pneumatic unit 310 receives a power source and starts the machine, and the pneumatic unit 310 drives gaseous carbon dioxide in the air inlet pipeline 101 to flow back to the energy release heat exchanger 100; when the device is specifically arranged, the pneumatic fan can drive gaseous carbon dioxide in the air inlet pipeline 101 to enter the energy release heat exchanger 100 through the pneumatic fan after being started.
Step 203, the energy release heat exchanger 100 heats the input gaseous carbon dioxide; when the gaseous carbon dioxide does not reach the set temperature, the gaseous carbon dioxide always flows in the heating flow path 300, the energy release heat exchanger 100 and the air inlet pipeline 101, and the energy release heat exchanger 100 continuously heats.
In step S204, the first valve 320 is closed after the gaseous carbon dioxide in the intake pipe 101 reaches the set temperature. At the specific setting, the set temperature is the turbine 200 start-up allowable temperature.
In the control method of the energy storage system 10, firstly, in step S201, the turbine 200 is not started before energy release begins, the first valve 320 is opened and the air source flow path 400 generates a power source, and the power source is input from the air source flow path 400 to the heating flow path 300; then, through step S202, after the pneumatic unit 310 receives the power source, the pneumatic unit 310 starts the engine, and the pneumatic unit 310 drives the gaseous carbon dioxide in the air inlet pipeline 101 to flow back from the air inlet pipeline 101 to the energy release heat exchanger 100 through the pneumatic unit 310; then, through step S203, the energy release heat exchanger 100 heats the input gaseous carbon dioxide until the gaseous carbon dioxide in the air inlet pipeline 101 is heated to the allowable temperature of the turbine 200; finally, through step S204, the temperature of the carbon dioxide in the air inlet pipe 101 and the temperature of the carbon dioxide therein reach a set temperature, and the set temperature is the turbine 200 start-up allowable temperature, at this time, the turbine 200 is in a state of allowing start-up, the first valve 320 is closed, the turbine 200 is started up, and the gaseous carbon dioxide enters the turbine 200, because the temperature of the gaseous carbon dioxide is higher at this time, the entering of the gaseous carbon dioxide does not affect the blades of the turbine 200; the control method of the energy storage system 10 is simple in logic and easy to implement, and can ensure the safety, reliability, high efficiency, stability, quick response and long service life of the energy storage system 10.
In a preferred embodiment of the above method for controlling the energy storage system 10, the method for controlling the energy storage system 10 is used for controlling the energy storage system 10 according to the above technical scheme, the energy storage system 10 further includes a monitoring module, and correspondingly, step S201 in the method for controlling the energy storage system 10 specifically includes the following steps: before the turbine 200 starts, the temperature acquisition element acquires and transmits temperature data of gaseous carbon dioxide of the air inlet pipeline 101; the control assembly compares the received temperature data with the turbine 200 start-up allowable temperature, and when the temperature data is less than the turbine 200 start-up allowable temperature, the first valve 320 is opened and the air source flow path 400 generates a power source; when the temperature data is greater than the turbine 200 start-up allowable temperature, the turbine 200 starts up and the first valve 320 is closed. By the control method of the energy storage system 10, the temperature data of the gaseous carbon dioxide of the air inlet pipeline 101 can be obtained more accurately, so that the operation time of the first valve 320 can be controlled to realize the accurate control of the temperature of the gaseous carbon dioxide of the air inlet pipeline 101, and the start-up of the turbine 200 can be controlled conveniently and accurately.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The utility model provides an energy storage system, includes release energy heat exchanger and turbine, release energy heat exchanger pass through the admission line with the turbine is connected, its characterized in that still includes heating flow path and air supply flow path, wherein:
the heating flow path is communicated with an inlet of the energy release heat exchanger and the air inlet pipeline and comprises a pneumatic unit and a first valve, and the first valve is positioned between the pneumatic unit and the turbine;
the air source flow path is communicated with the pneumatic unit and is used for generating a power source;
when the first valve is opened, the pneumatic unit receives the power source, starts the engine and drives gaseous carbon dioxide in the air inlet pipeline to flow back to the energy release heat exchanger for heating and raising the temperature.
2. The energy storage system of claim 1, further comprising a gas reservoir, the gas supply flow path comprising a gas supply conduit, a second valve, and a gas supply generation unit, wherein:
the air supply pipeline is sequentially connected with the air storage, the second valve, the air source generating unit and the pneumatic unit;
the gas source generating unit and the turbine are communicated with the gas storage, and the gas source generating unit is used for converting gaseous carbon dioxide from the gas storage into the power source.
3. The energy storage system of claim 2, further comprising a shaft seal flow path comprising a shaft seal conduit communicating a gas supply conduit at an outlet of the gas source generating unit with the turbine, the shaft seal conduit configured to conduct when the turbine is on and in operation, the power source generated by the gas source generating unit acting as a shaft seal gas source for the turbine.
4. The energy storage system of claim 3, wherein the turbine is a multi-stage turbine, the shaft seal conduit has a plurality of outlets, and the plurality of outlets of the shaft seal conduit are connected to the multi-stage turbine in a one-to-one correspondence.
5. The energy storage system of claim 2, wherein the pneumatic unit is a pneumatic blower and the power source is compressed gaseous carbon dioxide.
6. The energy storage system of claim 5, further comprising an exhaust flow path comprising an exhaust conduit communicating a motor chamber of the pneumatic blower and an inlet of the air supply generating unit, and a fifth valve in closed loop connection with the pneumatic blower, the exhaust conduit, the air supply generating unit, and the air supply conduit when the fifth valve is in the same open and closed state as the first valve.
7. The energy storage system of claim 1, further comprising an energy storage tank, an evaporator, and a sixth valve, wherein the energy storage tank, the evaporator, and the energy release heat exchanger are connected in sequence, the sixth valve is disposed between an outlet of the evaporator and an inlet of the energy release heat exchanger, and the sixth valve and a main valve of the turbine are opened when the turbine is started and operated.
8. The energy storage system of claim 7, further comprising a monitoring module comprising a temperature acquisition element and a control assembly, wherein:
the temperature acquisition element is arranged at the inlet of the main valve of the turbine and is used for acquiring temperature data of gaseous carbon dioxide of the air inlet pipeline;
the control assembly is in communication connection with the temperature acquisition element, the first valve and the turbine and is used for controlling the first valve and the turbine action according to the obtained temperature data.
9. A method of controlling an energy storage system according to any one of claims 1 to 8, comprising the steps of:
step S201, before the turbine is started, a first valve is opened, and a gas source flow path generates a power source;
step S202, a pneumatic unit receives a power source and starts a machine, and drives gaseous carbon dioxide in an air inlet pipeline to flow back to an energy release heat exchanger;
step S203, the energy release heat exchanger heats the input gaseous carbon dioxide;
in step S204, the first valve is closed after the gaseous carbon dioxide in the air inlet pipeline reaches a set temperature, wherein the set temperature is the turbine start-up allowable temperature.
10. The method according to claim 9, wherein the step S201 specifically includes the steps of:
before the turbine is started, a temperature acquisition element acquires and transmits temperature data of gaseous carbon dioxide of an air inlet pipeline;
the control assembly compares the received temperature data with the allowable temperature of the turbine starter, and when the temperature data is smaller than the allowable temperature of the turbine starter, the first valve is opened, and the air source flow path generates a power source; when the temperature data is greater than the allowable temperature of the turbine starter, the turbine starter and the first valve are closed.
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