CN113309589A - Deep peak regulation power station combining liquid air energy storage and deep peak regulation method - Google Patents
Deep peak regulation power station combining liquid air energy storage and deep peak regulation method Download PDFInfo
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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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
- F01K3/006—Accumulators and steam compressors
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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
- F01K3/02—Use of accumulators and specific engine types; Control thereof
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Abstract
The invention provides a deep peak regulation power station combining liquid air energy storage and a deep peak regulation method. The power station is connected with a driving flow path and a heat exchange flow path in a bypass mode between a first turbine set and a heat regenerator of a power plant unit, the driving flow path and the heat exchange flow path are connected in parallel and are respectively connected with an energy storage flow path and an energy release flow path of a liquid air energy storage unit; the first turbine set is used for doing work at any stage of the power grid so as to transmit power to the power grid; the interstage steam can be extracted from the first turbine set by using the driving flow path at the power utilization valley section of the power grid to drive the energy storage flow path to operate; in the power consumption peak section of the power grid, interstage steam can be extracted from the first turbine unit by the heat exchange flow path to exchange heat with the medium in the energy release flow path, so that the medium in the energy release flow path in the energy release power generation state can be preheated. Therefore, the power station carries out flexible peak regulation according to the power load stage of the power grid, reduces the energy conversion process, improves the overall operation efficiency of the power station and reduces the operation cost of the power station.
Description
Technical Field
The invention relates to the technical field of energy conservation and environmental protection, in particular to a deep peak regulation power station combining liquid air energy storage and a deep peak regulation method.
Background
With the sudden and violent advancement of global industrialization, the power grid load has periodic changes of daytime peak and night valley, and the peak-valley difference of the power load can reach 30-40% of the maximum power generation output. The existence of the peak-valley difference causes certain difficulty in power generation and power dispatching and brings certain risks to the operation of a power grid. Meanwhile, in order to meet the maximum load requirement of the power grid, the construction cost of the power grid is greatly increased, and the utilization efficiency is low.
At present, the peak regulation ratio of a thermal power plant in a power grid transmission technology is relatively highest, but is limited by the technical characteristics of the thermal power plant, and the peak regulation ratio of the thermal power plant is relatively low. When the electricity consumption is in a peak, the peak shaving power plant unit increases the generated energy, and when the electricity consumption is in a valley, the peak shaving power plant unit reduces the generated energy so as to realize peak shaving power generation. However, the increasing and decreasing amplitudes of the generated energy of the conventional peak-shaving thermal power plant cannot be too high, otherwise, the working efficiency of a boiler and a steam turbine set is seriously influenced; moreover, the generated power of the thermal power generating unit is adjusted mainly by changing the steam inlet parameters of the steam turbine unit, and the utilization efficiency of the boiler coal and the safety and the service life of the steam turbine unit are obviously influenced by overlarge parameter change amplitude; meanwhile, due to the hysteresis of changing parameters of the coal-fired boiler, peak shaving response is not timely.
Disclosure of Invention
The invention provides a deep peak regulation power station combining liquid air energy storage, which is used for solving the defects that in the prior art, a thermal power plant is limited by the technical characteristics of the thermal power plant, the working efficiency, the utilization efficiency, the safety and the service life of a boiler and a steam turbine set of the thermal power plant are seriously influenced by overlarge peak regulation amplitude, and the peak regulation response is not timely.
The invention also provides a deep peak regulation method.
The invention provides a deep peak regulation power station combining liquid air energy storage, which comprises:
the driving flow path is connected between a first turbine set and a heat regenerator of the power plant unit in a bypass mode, wherein the first turbine set and the heat regenerator are connected in the same steam circulation flow path;
the heat exchange flow path is connected between the first turbine set and the heat regenerator in a bypass mode and is arranged in parallel with the driving flow path;
the first turbine set is used for transmitting power to a power grid;
at a valley section of the power grid, the driving flow path can extract interstage steam from the first turbine set so as to drive an energy storage flow path of the liquid air energy storage unit to operate;
when the power grid is in a peak section, the heat exchange flow path can extract interstage steam from the first turbine unit to exchange heat with the energy release flow path of the liquid air energy storage unit so as to preheat a medium in the energy release flow path in an energy release power generation state.
According to the deep peak shaving power station combining liquid air energy storage, a second steam turbine set is arranged on a driving flow path, the liquid air energy storage unit comprises an air compressor set and an energy storage tank, the energy storage flow path is connected between the air compressor set and the energy storage tank, and the power output shaft end of the second steam turbine set is connected with the power input shaft end of the air compressor set.
According to the deep peak shaving power station combining liquid air energy storage, the liquid air energy storage unit further comprises an air turbine set and an air preheater, and the energy release flow path is connected between the energy storage flow path and the air turbine set; the first heat exchange side of the air preheater is connected to the heat release flow path and the second heat exchange side of the air preheater is connected to the heat exchange flow path.
According to the deep peak shaving power station combining liquid air energy storage, at least one control valve is arranged on the driving flow path and the heat exchange flow path respectively, and each control valve is in signal connection with the power grid respectively.
According to the deep peak shaving power station combining liquid air energy storage, at least one first control valve is arranged on a connecting pipeline between the steam inlet end of the second steam turbine set and the first steam turbine set; and/or the presence of a gas in the gas,
and at least one second control valve is arranged on a connecting pipeline between the steam exhaust end of the second steam turbine set and the heat regenerator.
According to the deep peak shaving power station combining liquid air energy storage, at least one third control valve is arranged on a connecting pipeline between a steam inlet end of a second heat exchange side of an air preheater and the first steam turbine set; and/or the presence of a gas in the gas,
and at least one fourth control valve is arranged on a connecting pipeline between the steam exhaust end of the second heat exchange side of the air preheater and the heat regenerator.
According to the deep peak shaving power station combining with liquid air energy storage provided by the invention, the liquid air energy storage unit further comprises:
the first heat exchange side and the second heat exchange side of the compression heat utilization device are respectively connected into the energy storage flow path and the energy release flow path;
a regenerator, a first heat exchange side of which is connected to the energy storage flow path between the compression heat utilization device and the energy storage tank, and a second heat exchange side of which is connected to the energy release flow path between the energy storage tank and the compression heat utilization device;
the throttling element is connected in the energy storage flow path between the first heat exchange side of the cold accumulator and the energy storage tank;
and the driving pump is connected in the energy release flow path between the energy storage tank and the second heat exchange side of the cold accumulator.
According to the deep peak shaving power station combining liquid air energy storage, the first turbine set is connected with the first generator, the air turbine set is connected with the second generator, and the first generator and the second generator can respectively transmit power to the power grid through power transmission pipelines.
According to the deep peak shaving power station combining liquid air energy storage, the power plant unit comprises a steam boiler, a condenser, a primary water feeding pump and a secondary water feeding pump, and the steam boiler, the first steam turbine unit, the condenser, the primary water feeding pump, the heat regenerator and the secondary water feeding pump are sequentially connected into the same steam circulation flow path.
The invention also provides a deep peak shaving method, which is executed by the deep peak shaving power station combining liquid air energy storage; the depth peak regulation method comprises the following steps:
the power grid is divided into a power level section, a power valley section and a power peak section according to the power load;
the power grid is in a power utilization level section, the driving flow path and the heat exchange flow path are both in a closed state, and the power plant unit applies work through the first turbine set to generate power to the power grid;
the power grid is located at a power utilization valley section, the power plant unit applies work through the first turbine set to generate power to the power grid, and the driving flow path is opened to drive interstage steam of the first turbine set to drive the energy storage flow path of the liquid air energy storage unit to operate;
the power grid is located at a peak section, the energy release flow path of the liquid air energy storage unit is driven to operate so as to generate electricity for the power grid, the power plant unit is driven to do work through the first turbine unit so as to generate electricity for the power grid, and the heat exchange flow path is opened so as to drive interstage steam of the first turbine unit to exchange heat with a medium in the energy release flow path.
The invention provides a deep peak shaving power station combining liquid air energy storage, which is characterized in that a driving flow path and a heat exchange flow path are connected between a first turbine set and a heat regenerator of a power plant unit in a bypass manner, the driving flow path and the heat exchange flow path are arranged in parallel, and the driving flow path and the heat exchange flow path are respectively connected with an energy storage flow path and a energy release flow path of the liquid air energy storage unit; the power station utilizes the first steam turbine set of the power plant unit to do work when the power grid is in any power utilization stage so as to realize normal power transmission to the power grid; in addition, interstage steam can be extracted from the first turbine set by using the driving flow path at the power consumption valley section of the power grid to drive the energy storage flow path to operate; in addition, interstage steam can be extracted from the first turbine unit by the heat exchange flow path to exchange heat with a medium in the energy release flow path at the power peak section of the power grid, so that the medium in the energy release flow path in the energy release power generation state can be preheated. Therefore, the power station can flexibly adjust the peak according to the power load stage of the power grid, on one hand, interstage steam of the first steam turbine set extracted by the driving flow path can be used for directly driving the liquid air energy storage unit to realize energy storage in the peak adjusting process, and on the other hand, interstage steam of the first steam turbine set extracted by the heat exchange flow path can be used for preheating a medium in the energy release flow path in the energy release power generation state, so that the energy conversion process of 'steam-generator-electric energy-motor-air compressor' in the prior art is reduced, the energy release efficiency of the liquid air energy storage unit is improved, the overall operation efficiency of the power station is effectively improved, and the operation cost of the power station is reduced.
In other words, the power station is combined with the liquid air energy storage unit on the basis of the traditional peak-shaving thermal power plant, and in a power grid power consumption valley section, steam parameters of a steam boiler do not need to be changed, but part of low-pressure steam is extracted from the interstage of a first steam turbine unit to drive a second steam turbine unit to operate, so that the liquid air energy storage unit is driven to store energy; in the power peak section of the power grid, the steam parameters of the steam boiler do not need to be changed, the power is output through the liquid air energy storage unit, and part of low-pressure steam is extracted from the interstage of the second steam turbine unit and used for preheating the air inlet of the air turbine unit, so that the power generation power is increased. The arrangement can not only increase the peak regulation capacity range of the power plant unit to 30-200% of rated power, thereby realizing high-power deep peak regulation; the steam boiler can be kept running without stopping under the rated working condition all the time, the running efficiency of the thermal power plant is improved, and meanwhile, the quick response of peak clipping and valley filling can be realized through starting and stopping the liquid air energy storage unit. In addition, the power station can effectively reduce the flow of the low-pressure end of the first turbine unit by pumping air from the interstage of the first turbine unit, so that the length of the last-stage blade of the first turbine unit is reduced, and the efficiency of the first turbine unit is improved.
Specifically, the existing traditional thermal power plant is limited by the technical characteristics, the peak regulation capacity range is only 50% -100%, the peak regulation efficiency is low, and the response speed is too slow, compared with the existing thermal power plant, the peak regulation capacity range of the power station disclosed by the invention can reach 30% -200%, the peak regulation range is effectively expanded, the peak regulation efficiency is high, and the response speed is fast.
Furthermore, in the construction process of the power station, the power plant unit and the liquid air energy storage unit can share a large number of public engineering facilities, namely, the facility reconstruction can be directly carried out on the basis of the original thermal power plant, so that compared with the construction of the liquid air energy storage power station in the prior art, the initial investment of the power station reconstruction can be obviously reduced, and the construction cost is reduced.
The invention also provides a deep peak shaving method, which is executed by the deep peak shaving power station combined with the liquid air energy storage, so that the deep peak shaving method has all the advantages of the deep peak shaving power station combined with the liquid air energy storage, and details are not repeated herein.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a deep peak shaving power station combining liquid air energy storage provided by the invention.
Reference numerals:
1: a steam boiler; 2: a first turbine unit; 3: a condenser;
4: a primary feed pump; 5: a heat regenerator; 6: a secondary feed pump;
7: a second turbine unit; 8: a first control valve; 9: a second control valve;
10: a third control valve; 11: a fourth control valve; 12: an air compressor unit;
13: a compression heat utilizing device; 14: a regenerator; 15: a throttling element;
16: an energy storage tank; 17: driving the pump; 18: an air preheater;
19: an air turbine unit; 20: a first transmission line; 21: a second transmission line;
22: a power grid; 23: a first generator; 24: a second generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The deep peak shaving power station (an embodiment of the present invention may be simply referred to as "power station" or "deep peak shaving power station") combining liquid air energy storage and the deep peak shaving method implemented by the power station of the present invention are described below with reference to fig. 1.
As shown in fig. 1, the deep peaking plant includes a drive flow path and a heat exchange flow path. The driving flow path is connected between a first turbine set 2 and a heat regenerator 5 of the power plant unit in a bypass mode, wherein the first turbine set 2 and the heat regenerator 5 are connected in the same steam circulation flow path; the heat exchange flow path is connected between the first turbine unit 2 and the heat regenerator 5 in a bypass manner and is arranged in parallel with the driving flow path. Wherein the first turbine group 2 is used for transmitting power to the grid 22; in the power utilization valley section of the power grid 22, the driving flow path can extract interstage steam from the first turbine unit 2 to drive the energy storage flow path of the liquid air energy storage unit to operate; in the peak section of the power grid 22, the heat exchange flow path can extract the interstage steam from the first turbine unit 2 to exchange heat with the energy release flow path of the liquid air energy storage unit, so as to preheat the medium in the energy release flow path in the energy release power generation state.
In other words, the power station is connected with a driving flow path and a heat exchange flow path in a bypass mode between a first turbine set 2 and a heat regenerator 5 of the power plant unit, the driving flow path and the heat exchange flow path are arranged in parallel, and the driving flow path and the heat exchange flow path are respectively connected with an energy storage flow path and an energy release flow path of a liquid air energy storage unit; the power station utilizes the first steam turbine set 2 of the power plant unit to do work when the power grid 22 is in any power utilization stage so as to realize normal power transmission on the power grid 22; moreover, at the power consumption valley section of the power grid 22, interstage steam can be extracted from the first turbine unit 2 by using the driving flow path to drive the energy storage flow path to operate; in addition, at the peak section of the power grid 22, interstage steam can be extracted from the first turbine unit 2 by using the heat exchange flow path to exchange heat with the medium in the energy release flow path, so as to preheat the medium in the energy release flow path in the energy release power generation state.
Therefore, the power station can carry out flexible peak regulation according to the power load stage of the power grid 22, on one hand, interstage steam of the first turbine set 2 extracted by the driving flow path can be used for directly driving the liquid air energy storage unit to realize energy storage in the peak regulation process, on the other hand, interstage steam of the first turbine set 2 extracted by the heat exchange flow path can be used for preheating a medium in the energy release flow path in the energy release power generation state, so that the energy conversion process of 'steam-generator-electric energy-motor-air compressor' in the prior art is reduced, the energy release efficiency of the liquid air energy storage unit is improved, the overall operation efficiency of the power station is effectively improved, the operation cost of the power station is reduced, and the power station has the advantages of wide peak regulation range, high peak regulation efficiency and high response speed.
In some embodiments, the power plant unit includes a steam boiler 1, a first turbine set 2 as described above, a condenser 3, a primary feedwater pump 4, a regenerator 5 as described above, and a secondary feedwater pump 6. The steam boiler 1, the first steam turbine unit 2, the condenser 3, the primary water feeding pump 4, the heat regenerator 5 and the secondary water feeding pump 6 are sequentially connected in the same steam circulation flow path to form a set of power plant power generation circulation for generating power by applying work through steam.
It is understood that the first turbine group 2 is connected to a first generator 23, and the first generator 23 is connected to the grid 22 via a first power transmission line 20. The first turbine set 2 drives the first generator 23 by applying work to generate electricity, thereby transmitting electricity to the grid 22 via the first transmission line 20.
Understandably, the preferred power plant unit is a peaker thermal power plant. Further, the power plant unit is preferably a condensing peak-shaving thermal power plant or a thermal power plant.
It can be understood that the steam boiler 1 is preferably at least one of a coal-fired boiler, a gas-fired boiler, and a waste heat boiler.
It will be appreciated that the first turbine unit 2 is preferably of the radial, axial or radial-axial type. Preferably, the first turbine set 2 comprises one or more turbines, each of which is integrated in series, parallel or series-parallel to form the first turbine set 2. The interstage of the first turbine unit 2 means between two adjacent turbines, and preferably a preheater is provided before each stage of the turbine.
In some embodiments, as shown in FIG. 1, a second turbine set 7 is provided in the drive flow path. The liquid air energy storage unit includes an air compressor package 12 and an energy storage tank 16. The charge flow path is connected between the air compressor package 12 and the charge tank 16. The power output shaft end of the second turbine unit 7 is connected with the power input shaft end of the air compressor unit 12. The interstage steam of the first turbine set 2 can be introduced into the second turbine set 7 by starting the driving flow path, so that the second turbine set 7 is driven to operate, the air compressor set 12 is directly driven to operate through mechanical energy, air entering the air compressor set 12 is compressed, and the energy storage stage of the liquid air energy storage unit is achieved and completed.
It will be appreciated that the second turbine unit 7 is preferably of radial, axial or radial-axial design. Preferably, the second turbine group 7 comprises one or more turbines, each turbine forming the second turbine group 7 by series, parallel or series-parallel integration. Preferably, a preheater is provided in front of each stage of the steam turbine.
It will be appreciated that in order to increase the efficiency of the drive flow path and to provide reliable control of the steam flowing through the drive flow path for efficient driving of the air compressor package 12, it is preferred that the drive flow path is controlled to provide an interstage extraction pressure of from 1bar to 10bar for the first turbine package 2.
In some embodiments, the liquid air energy storage unit further includes an air turbine set 19 and an air preheater 18. The discharge flow path is connected between the storage flow path and the air turbine unit 19. Preferably, a second generator 24 is connected to air turbine unit 19, second generator 24 being able to deliver power to electrical grid 22 via a power line. The first heat exchange side of the air preheater 18 is connected to the energy release flow path, and the second heat exchange side of the air preheater 18 is connected to the heat exchange flow path, so that steam in the heat exchange flow path exchanges heat between the air in the air preheater 18 and the air in the energy release flow path, and the effect of preheating a medium in the energy release pipe of the liquid air energy storage unit by using interstage steam of the first turbine unit 2 is achieved, the working efficiency and the work capacity of the air turbine unit 19 are further increased, and the power generation capacity of the second generator 24 is further improved.
In some embodiments, the liquid air energy storage unit further comprises a compression heat utilization device 13, a regenerator 14, a throttling element 15 and a drive pump 17. The first heat exchange side and the second heat exchange side of the compression heat utilization device 13 are connected to the energy storage flow path and the energy release flow path, respectively. The compression heat utilization device 13 can store the compression heat of the compressed air when the liquid air energy storage unit is in the energy storage stage, so as to heat the air flowing through the compression heat utilization device 13 when the liquid air energy storage unit is in the energy release stage. The first heat exchange side of the cold accumulator 14 is connected to the energy storage flow path between the compression heat utilization device 13 and the energy storage tank 16, the second heat exchange side of the cold accumulator 14 is connected to the energy release flow path between the energy storage tank 16 and the compression heat utilization device 13, and the cold accumulator 14 can reserve the cold energy of the liquid air flowing through the cold accumulator 14 in the energy release stage of the liquid air energy storage unit, so that the normal-temperature and high-pressure air flowing through the cold accumulator 14 in the energy storage stage of the liquid air energy storage unit is cooled. The throttling element 15 is connected in an energy storage flow path between the first heat exchange side of the cold accumulator 14 and the energy storage tank 16, and the throttling element 15 can perform pressure reduction expansion on the cooled low-temperature high-pressure air in the energy storage stage so as to convert the air into liquid air. The driving pump 17 is connected to the energy release flow path between the energy storage tank 16 and the second heat exchange side of the regenerator 14, and the driving pump 17 can realize start-stop response according to a control signal of the power grid 22, so that the energy release flow path of the liquid air energy storage unit is started in time when the power grid 22 enters an electricity consumption peak section, and liquid air in the energy storage tank 16 enters the regenerator 14 under the supercharging effect of the driving pump 17.
It will be appreciated that the preferred configuration of the air compressor package 12 is piston, screw, or centrifugal. Preferably, the air compressor package 12 includes one or more compressors. The air compressor units 12 are integrated in series, parallel, or both. A compression heat utilizing device 13 may be provided after each stage of the compressor.
It will be appreciated that the air turbine unit 19 is preferably of radial, axial or radial-axial design. Preferably, air turbine set 19 includes one or more turbines that are integrated in series, parallel, or both to form air turbine set 19. Preferably, a preheater is provided before each stage of the turbine.
It will be appreciated that the preferred air preheater 18 is one or a combination of shell and tube configurations, plate fin configurations and tube wound configurations.
It will be appreciated that the compression heat utilization device 13 can preferably use the stored compression heat both for preheating the intake air of the air turbine unit 19 and for producing domestic hot water, heating water or for cooling the absorption refrigerating unit. For example, the compression heat utilization device 13 is a lithium bromide unit or an ammonia unit.
It will be appreciated that the regenerator 14 preferably employs a combination of one or more of a liquid phase regenerator 14, a solid phase regenerator 14, or a phase change material regenerator 14. The cold storage medium of the liquid phase regenerator 14 is preferably at least one of methanol, propane, and R123. The cold storage medium of the solid phase regenerator 14 is preferably at least one of metal, rock and glass. Preferably, within the regenerator 14, the air, in liquid or gaseous form, is in direct or indirect contact heat exchange with the cold storage medium. Preferably, the regenerator 14 comprises one or more cold accumulators, each of which is formed by connecting in series, in parallel, or in a combination of series and parallel.
It will be appreciated that the throttling element 15 is preferably a cryogenic expander or throttle.
It will be appreciated that the preferred energy storage tank 16 is a dewar or cryogenic storage tank.
It will be appreciated that the pump body structure of the drive pump 17 is preferably of the piston or centrifugal type.
It will be appreciated that the control signal for the preferred power grid 22 may be a dispatching command signal for the power grid 22, or may be an internal dispatching command signal for the power plant unit.
In some embodiments, it is preferable that at least one control valve is disposed on each of the driving flow path and the heat exchange flow path, and each control valve is in signal connection with the power grid 22. The control valve can flexibly regulate and control the flow and the flow speed of the steam extracted from the interstage of the first steam turbine unit 2, so that the steam boiler 1 of the power plant unit does not need to be subjected to parameter control, the control process is simplified, and the service life of the steam boiler 1 is prolonged.
Specifically, at least one first control valve 8 is arranged on a connecting pipeline between the steam inlet end of the second steam turbine unit 7 and the first steam turbine unit 2; and/or at least one second control valve 9 is arranged on a connecting pipeline between the steam exhaust end of the second turbine unit 7 and the heat regenerator 5. At least one third control valve 10 is arranged on a connecting pipeline between the steam inlet end of the second heat exchange side of the air preheater 18 and the first turbine set 2; and/or at least one fourth control valve 11 is arranged on a connecting pipeline between the steam exhaust end of the second heat exchange side of the air preheater 18 and the heat regenerator 5.
As shown in fig. 1, in the power plant according to this embodiment, a first control valve 8 is disposed on a connection pipeline between the steam inlet end of the second turbine set 7 and the first turbine set 2, a second control valve 9 is disposed on a connection pipeline between the steam outlet end of the second turbine set 7 and the regenerator 5, a third control valve 10 is disposed on a connection pipeline between the steam inlet end of the second heat exchange side of the air preheater 18 and the first turbine set 2, and a fourth control valve 11 is disposed on a connection pipeline between the steam outlet end of the second heat exchange side of the air preheater 18 and the regenerator 5. The device can realize the combined regulation and control of the driving flow path and the heat exchange flow path and can also improve the safety.
The invention also provides a deep peak regulation method, which is executed by the deep peak regulation power station combining with the liquid air energy storage, so that the deep peak regulation method has all the advantages of the deep peak regulation power station combining with the liquid air energy storage, and the advantages of the deep peak regulation method are not described herein again.
In the deep peak shaving method, the power grid 22 is divided into a power level section, a power valley section and a power peak section according to the power load. The electricity utilization level section refers to that the electricity utilization load of the power grid 22 is in an average level range, and the average level range is obtained through comprehensive evaluation according to actual electricity utilization load data such as the integral electricity utilization load, the annual average electricity utilization load, the monthly average electricity utilization load, the current day average electricity utilization load and the like of users at the place of the power grid 22; the valley section refers to a stage in which the power grid 22 is in a range in which the power load is lower than the average level, and the peak section refers to a stage in which the power grid 22 is in a range in which the power load is higher than the average level.
In the deep peak shaving method, when the power grid 22 is in the power level section, the driving flow path and the heat exchange flow path are both in the closed state, and the power plant unit applies work through the first steam turbine set 2 to generate power to the power grid 22.
Specifically, as shown in fig. 1, in the power grid 22 in the power-use level section, the steam circulation flow path of the power plant unit normally operates, that is, the steam boiler 1 operates at the rated power, so as to utilize the high-pressure steam generated by the steam boiler 1 to drive the first steam turbine set 2 to stably operate at the rated power, and further drive the first generator 23 to generate electricity, so as to transmit the generated electric energy to the power grid 22 through the first power transmission line 20; the exhaust steam generated by the first steam turbine set 2 enters the condenser 3 to be condensed into liquid, and enters the steam boiler 1 to be heated again to generate high-pressure steam after being pressurized by the primary water feeding pump 4. In the active level section, the liquid air energy storage unit is not operated.
In the deep peak shaving method, the power grid 22 is located at a power utilization valley section, the power plant unit applies work through the first steam turbine set 2 to generate power for the power grid 22, and the driving flow path is opened to drive interstage steam of the first steam turbine set 2 to drive the energy storage flow path of the liquid air energy storage unit to operate.
Specifically, as shown in fig. 1, when the power grid 22 is in the valley section, the steam boiler 1 still operates at the rated power to realize power transmission to the power grid 22, and detailed description is omitted. Opening both the first control valve 8 and the second control valve 9 to start the driving flow path, so as to extract part of low-pressure steam from the interstage of the first turbine unit 2 by using the driving flow path to drive the second turbine unit 7 to operate, and realizing flexible adjustment of steam flow and flow rate in the driving flow path by using the opening degrees of the first control valve 8 and the second control valve 9 respectively or cooperatively; the second turbine set 7 drags the air compressor set 12 of the liquid air energy storage unit to operate through operation, so that normal temperature and normal pressure air is compressed to medium temperature and high pressure, medium temperature compression heat is recycled through the compression heat utilization device 13, then the high pressure air cooled to the normal temperature enters the cold accumulator 14 to be cooled to low temperature, after the high pressure air is subjected to pressure reduction and expansion through the throttling element 15, the generated liquid air is stored in the energy storage tank 16, and therefore the energy storage process of the energy storage flow path of the liquid air energy storage unit is completed.
In the deep peak regulation method, the power grid 22 is in the peak utilization section, the energy release flow path of the liquid air energy storage unit is driven to operate so as to generate electricity for the power grid 22, the power plant unit is driven to do work through the first steam turbine unit 2 so as to generate electricity for the power grid 22, and the heat exchange flow path is opened so as to drive interstage steam of the first steam turbine unit 2 to exchange heat with a medium in the energy release flow path.
Specifically, as shown in fig. 1, in the peak of the power consumption of the power grid 22, the steam boiler 1 still operates at the rated power to realize power transmission to the power grid 22, and the detailed operation is not described again. The power grid 22 starts the driving pump 17 of the liquid air energy storage unit by the control signal when the power grid is judged to be in the peak power consumption period, so that the liquid air in the energy storage tank 16 enters the cold storage device 14 through the pressurization effect of the driving pump 17, and the cold energy of the liquid air is reserved in the cold storage device 14 to be used in the energy storage period. The high-pressure air after being reheated enters an air preheater 18 after being heated by a compression heat utilization device 13; at the same time, the third control valve 10 and the fourth control valve 11 are both opened to activate the heat exchange flow path, so that the heat exchange flow path is used to extract part of the low-pressure steam from the interstage of the first turbine unit 2 to enter the air preheater 18 to exchange heat with the high-pressure air flowing through the air preheater 18 in the energy release flow path of the liquid air energy storage unit, so that the high-pressure air is preheated in the air preheater 18; the opening degrees of the third control valve 10 and the fourth control valve 11 are used for realizing flexible adjustment of the steam flow and the flow speed in the heat exchange flow path respectively or cooperatively. The preheated high-pressure air enters the air turbine unit 19 to do work through expansion and drive the second generator 24 to generate electricity, so that the generated electric energy is transmitted to the power grid 22 through the second power transmission line 21, and the energy release process of the energy release flow path of the liquid air energy storage unit is completed.
It will be appreciated that, preferably in the valley section of the power grid 22, the power transmission process of the power plant unit and the energy storage process of the liquid air energy storage unit may be parallel or may have a sequential or intermittent operation; preferably, at the peak of the power grid 22, the power transmission process of the power plant unit and the energy release process of the liquid air energy storage unit may be parallel or may have a sequential or intermittent operation.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A deep peak shaving power station combining liquid air energy storage is characterized by comprising:
the driving flow path is connected between a first turbine set and a heat regenerator of the power plant unit in a bypass mode, wherein the first turbine set and the heat regenerator are connected in the same steam circulation flow path;
the heat exchange flow path is connected between the first turbine set and the heat regenerator in a bypass mode and is arranged in parallel with the driving flow path;
the first turbine set is used for transmitting power to a power grid;
at a valley section of the power grid, the driving flow path can extract interstage steam from the first turbine set so as to drive an energy storage flow path of the liquid air energy storage unit to operate;
when the power grid is in a peak section, the heat exchange flow path can extract interstage steam from the first turbine unit to exchange heat with the energy release flow path of the liquid air energy storage unit so as to preheat a medium in the energy release flow path in an energy release power generation state.
2. The deep peak shaving power station combining liquid air energy storage according to claim 1, wherein a second turbine unit is arranged on the driving flow path, the liquid air energy storage unit comprises an air compressor unit and an energy storage tank, the energy storage flow path is connected between the air compressor unit and the energy storage tank, and a power output shaft end of the second turbine unit is connected with a power input shaft end of the air compressor unit.
3. The combined liquid air energy storage deep peaking power plant of claim 2, wherein the liquid air energy storage unit further includes an air turbine set and an air preheater, the discharge flow path being connected between the energy storage flow path and the air turbine set; the first heat exchange side of the air preheater is connected to the heat release flow path and the second heat exchange side of the air preheater is connected to the heat exchange flow path.
4. The deep peak shaving power station combining liquid air energy storage according to claim 3, wherein at least one control valve is arranged on each of the driving flow path and the heat exchange flow path, and each control valve is in signal connection with the power grid.
5. The deep peak shaving power station combining liquid air energy storage according to claim 4, wherein at least one first control valve is arranged on a connecting pipeline between the steam inlet end of the second steam turbine set and the first steam turbine set; and/or the presence of a gas in the gas,
and at least one second control valve is arranged on a connecting pipeline between the steam exhaust end of the second steam turbine set and the heat regenerator.
6. The deep peak shaving power plant combined with liquid air energy storage according to claim 4, characterized in that at least one third control valve is arranged on a connecting pipeline between the steam inlet end of the second heat exchange side of the air preheater and the first turbine set; and/or the presence of a gas in the gas,
and at least one fourth control valve is arranged on a connecting pipeline between the steam exhaust end of the second heat exchange side of the air preheater and the heat regenerator.
7. The deep peak shaving power station in combination with liquid air energy storage according to claim 3, characterized in that the liquid air energy storage unit further comprises:
the first heat exchange side and the second heat exchange side of the compression heat utilization device are respectively connected into the energy storage flow path and the energy release flow path;
a regenerator, a first heat exchange side of which is connected to the energy storage flow path between the compression heat utilization device and the energy storage tank, and a second heat exchange side of which is connected to the energy release flow path between the energy storage tank and the compression heat utilization device;
the throttling element is connected in the energy storage flow path between the first heat exchange side of the cold accumulator and the energy storage tank;
and the driving pump is connected in the energy release flow path between the energy storage tank and the second heat exchange side of the cold accumulator.
8. The liquid air energy storage combined deep peaking power plant of claim 3, wherein the first turbine set is connected with a first generator, the air turbine set is connected with a second generator, and the first generator and the second generator are respectively capable of transmitting power to the power grid through power transmission pipelines.
9. The combined liquid air energy storage deep peaking power plant of any of claims 1 to 8, wherein the power plant unit includes a steam boiler, a condenser, a primary water feed pump and a secondary water feed pump, the steam boiler, the first turbine set, the condenser, the primary water feed pump, the regenerator and the secondary water feed pump are connected in sequence in the same steam cycle flow path.
10. A deep peak shaving method, characterized by being carried out by a deep peak shaving power station combined with liquid air energy storage according to any one of claims 1 to 9; the depth peak regulation method comprises the following steps:
the power grid is divided into a power level section, a power valley section and a power peak section according to the power load;
the power grid is in a power utilization level section, the driving flow path and the heat exchange flow path are both in a closed state, and the power plant unit applies work through the first turbine set to generate power to the power grid;
the power grid is located at a power utilization valley section, the power plant unit applies work through the first turbine set to generate power to the power grid, and the driving flow path is opened to drive interstage steam of the first turbine set to drive the energy storage flow path of the liquid air energy storage unit to operate;
the power grid is located at a peak section, the energy release flow path of the liquid air energy storage unit is driven to operate so as to generate electricity for the power grid, the power plant unit is driven to do work through the first turbine unit so as to generate electricity for the power grid, and the heat exchange flow path is opened so as to drive interstage steam of the first turbine unit to exchange heat with a medium in the energy release flow path.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234318A (en) * | 2022-09-22 | 2022-10-25 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system matched with thermal power plant deep peak shaving and control method thereof |
| CN116291785A (en) * | 2023-03-24 | 2023-06-23 | 北京翰能智成节能技术有限公司 | Combined heat and power generation system |
| CN117072268A (en) * | 2023-10-12 | 2023-11-17 | 浙江博旭新能源科技有限公司 | Comprehensive utilization energy storage system and method for LNG cold energy and compressor inter-stage cooling water |
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2021
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234318A (en) * | 2022-09-22 | 2022-10-25 | 百穰新能源科技(深圳)有限公司 | Carbon dioxide energy storage system matched with thermal power plant deep peak shaving and control method thereof |
| CN116291785A (en) * | 2023-03-24 | 2023-06-23 | 北京翰能智成节能技术有限公司 | Combined heat and power generation system |
| CN116291785B (en) * | 2023-03-24 | 2024-02-02 | 北京翰能智成节能技术有限公司 | Combined heat and power generation system |
| CN117072268A (en) * | 2023-10-12 | 2023-11-17 | 浙江博旭新能源科技有限公司 | Comprehensive utilization energy storage system and method for LNG cold energy and compressor inter-stage cooling water |
| CN117072268B (en) * | 2023-10-12 | 2024-01-19 | 浙江博旭新能源科技有限公司 | Comprehensive utilization energy storage system and method for LNG cold energy and compressor inter-stage cooling water |
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