CN111322773A - Peak-shaving energy storage system for solar power generation of new energy source - Google Patents
Peak-shaving energy storage system for solar power generation of new energy source Download PDFInfo
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- CN111322773A CN111322773A CN202010146286.XA CN202010146286A CN111322773A CN 111322773 A CN111322773 A CN 111322773A CN 202010146286 A CN202010146286 A CN 202010146286A CN 111322773 A CN111322773 A CN 111322773A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
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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
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a peak shaving energy storage system for solar power generation of a new energy source, which comprises a photo-thermal conversion device, wherein the photo-thermal conversion device is heated and then transmits steam to a program control valve, the program control valve transmits part of the steam to a steam turbine set for power generation, the part of the steam higher than a load demand is pressurized and stored to a pressure-resistant heat-insulation bin, and the pressure-resistant heat-insulation bin transmits high-pressure steam to the steam turbine set when the input steam pressure of the steam turbine set is not enough to meet the load demand; in the implementation of the invention, the thermal circulation pipeline is prevented from being blocked, the substance bearing heat in the system is steam, even if no solar energy is input in the continuous rainy days, the steam becomes liquid water after the temperature is reduced, and the thermal circulation pipeline cannot be blocked; high density stored energy, in the withstand voltage heat preservation storehouse of storage after pressurizing steam in this scheme, change the ratio of grow piston and little piston, can improve the multiplying power of compression, rely on the pressure realization of steam itself to the compression of steam moreover, the stored energy that can the high density.
Description
Technical Field
The invention relates to the field of new energy power generation, in particular to a peak shaving energy storage system for new energy solar power generation.
Background
Solar energy in new forms of energy is widely popularized due to its wide source, and besides mainstream photovoltaic power generation, power generation can be realized by means of the photothermal effect and the generated heat.
The existing fused salt circulating heat storage technology is put into application, the fused salt is heated by sunlight, the mixture of sodium chloride and potassium chloride is mostly used, the melting point is 625 ℃, the fused salt is heated in the daytime to generate electricity, the sunlight does not exist at night, the stored high-temperature fused salt can also generate electricity, and the solar-powered fused salt heat storage technology is very suitable for rainy-sunny areas in the north.
However, for non-northern areas, the photo-thermal conditions are also sufficient, but continuous rainy days can appear, and unheated salt can be cooled and solidified for many days, so that the whole equipment is scrapped.
Therefore, a new medium is needed to replace molten salt, and the whole system can store the energy which is not used up instantly in high density.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a peak shaving energy storage system for solar power generation, which not only avoids blocking a thermal circulation pipeline, but also can store energy at high density.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a peak shaving energy storage system for solar power generation of a new energy source comprises a photo-thermal conversion device, wherein steam is transmitted to a program control valve after the photo-thermal conversion device is heated, part of the steam is transmitted to a steam turbine set through the program control valve to generate power, the steam higher than a load demand part is stored to a pressure-resistant heat-preservation bin in a pressurized mode, the steam is used as a heat carrier, blocking of a heat circulation pipeline is avoided, a heat-bearing substance in the system is the steam, and even if no solar energy is input in continuous rainy days and cloudy days, the steam becomes liquid water after the temperature is reduced, and the heat circulation pipeline cannot be blocked;
the high-pressure heat preservation cabin conveys high-pressure steam to the steam turbine unit when the input steam pressure of the steam turbine unit is not enough to meet the load requirement, the steam is pressurized and then stored in the high-pressure heat preservation cabin, the ratio of a large piston to a small piston is changed, the compression multiplying power can be improved, the steam is compressed by the aid of the pressure of the steam, and energy can be stored at high density.
Further, the programmable valve comprises three programmable switches;
the first program control switch is communicated with the photo-thermal conversion device;
the second program control switch is communicated with the steam turbine set;
the third program-controlled switch is communicated with a pressurizer, and the pressurizer is used for storing the steam pressure after being lifted into the pressure-resistant heat-preservation cabin;
the program control valve sequentially and circularly executes the following steps:
the first program control switch and the third program control switch are turned on, the second program control switch is turned off, the steam from the photothermal conversion device enters the pressurizer, the pressurized steam enters the pressure-resistant heat-preservation cabin for storage,
and opening the second program control switch and the third program control switch, closing the first program control switch, and allowing the unpressurized steam in the pressurizer to enter the steam turbine set and push the steam turbine set to rotate to generate power.
Furthermore, the compressor comprises a pressure-resistant pipe communicated with the third program-controlled switch, the pressure-resistant pipe is sequentially connected with a large pressure cylinder and a small pressure cylinder in parallel, a large piston and a small piston are respectively arranged in the large pressure cylinder and the small pressure cylinder, the large piston and the small piston are respectively hinged with two ends of a balancing rod through transmission rods, and the balancing rod is rotatably connected with the base;
two sides of the communication part of the small pressure cylinder and the pressure-resistant pipe are respectively provided with a one-way valve, and the one-way valves are opened towards the pressure-resistant heat-preservation cabin in a one-way manner;
the compressor cyclically executes the following steps under the control of the program control valve:
opening the first program-controlled switch and the third program-controlled switch, closing the second program-controlled switch, allowing the steam from the photothermal conversion device to enter the large pressure cylinder and the small pressure cylinder, and opening the first one-way valve, and closing the second one-way valve due to the fact that the pressure-resistant heat-preservation cabin is higher than the steam pressure in the pipeline at the moment;
because the area of the large piston is larger than that of the small piston, under the condition that the large piston and the small piston are subjected to the same pressure intensity, the steam in the small pressure cylinder is compressed through the transmission action of the transmission rod and the balance rod, at the moment, the first one-way valve is closed, when the pressure intensity of the compressed steam is larger than that in the pressure-resistant heat-preservation bin, the second one-way valve is opened, high-pressure steam is stored, the area ratio of the large piston to the small piston is changed, and the multiple of the steam compression can be adjusted;
opening the second program-controlled switch and the third program-controlled switch, closing the first program-controlled switch, allowing the pressure-resistant pipe and the steam in the large piston to enter the relatively low-pressure steam turbine set, and allowing the large piston and the small piston to reset after the pressure is reduced.
Furthermore, the programmable valve executes the opening of the first programmable switch and the third programmable switch, and the duration of the closing of the second programmable switch is T1The duration of turning on the second program-controlled switch and the third program-controlled switch and turning off the first program-controlled switch is T2；
Adjusting T1And T2The numerical value of (2) is such that at the instant when the programmable valve performs the opening and closing action, the speed of the large piston and the small piston is zero and are positioned at the end part of the inner cavity of the pressure cylinder.
Further, said adjusting T1And T2The numerical values of (a) specifically include,
when the first program control switch and the third program control switch are turned on and the second program control switch is turned off, the operation is continued until the large piston and the small piston impact the pressure cylinder, and the required time T is recorded1；
When the second program control switch and the third program control switch are turned on and the first program control switch is turned off, the operation is continued until the large piston and the small piston impact the pressure cylinder, and the required time T is recorded2，
Decrease T step by step in equal proportion1And T2The numerical value of (2) is such that at the instant when the programmable valve performs the opening and closing action, the speed of the large piston and the small piston is zero and are positioned at the end part of the inner cavity of the pressure cylinder.
Furthermore, the one-way valve comprises a valve body which is fixed with the pressure-resistant pipe in a sealing mode, a conical cavity with an opening facing the pressure-resistant heat-preservation bin is formed in the valve body, a conical valve core with the same cone angle is arranged in the conical cavity, and a blocking block is fixed at the opening end of the conical cavity.
Furthermore, the cone valve core and the blocking block are provided with elastic pieces, and the elastic pieces press the cone valve core to be just in sealing contact under the action of no external force.
The benefit effects of the invention are:
1. the thermal circulation pipeline is prevented from being blocked, the substance bearing heat in the system is steam, and even if no solar energy is input in continuous rainy days, the steam becomes liquid water after the temperature is reduced, and the thermal circulation pipeline cannot be blocked.
2. High density stored energy, in the withstand voltage heat preservation storehouse of storage after pressurizing steam in this scheme, change the ratio of grow piston and little piston, can improve the multiplying power of compression, rely on the pressure realization of steam itself to the compression of steam moreover, the stored energy that can the high density.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic connection diagram of a peak shaving energy storage system for solar power generation of the new energy source of the present invention;
FIG. 2 is a schematic view of the overall structure of the pressurizer of the present invention;
FIG. 3 is a schematic cross-sectional view of the pressurizer of the present invention;
FIG. 4 is a schematic view of a work cycle of the programmable valve of the present invention;
FIG. 5 is a schematic cross-sectional view of a one-way valve according to the present invention;
FIG. 6 is a schematic view of the overall structure of the check valve of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 first embodiment is as follows:
as shown in fig. 1, the peak shaving energy storage system for solar power generation with a new energy source comprises a photo-thermal conversion device 1, wherein the photo-thermal conversion device 1 is heated and then transmits steam to a program control valve 2, the program control valve 2 transmits part of the steam to a turbine set 3 for power generation, and the steam higher than a load demand part is pressurized and stored in a pressure-resistant heat-preservation bin 5;
the pressure-resistant heat-preservation bin 5 is used for conveying high-pressure steam to the steam turbine set 3 when the input steam pressure of the steam turbine set is not enough to meet the load requirement.
Example two:
as shown in fig. 1, the peak shaving energy storage system for solar power generation with a new energy source comprises a photo-thermal conversion device 1, wherein the photo-thermal conversion device 1 is heated to transmit steam to a programmable valve 2, and the programmable valve 2 comprises three programmable switches 21, 22 and 23;
the first program control switch 21 is communicated with the photo-thermal conversion device 1;
the second program control switch 22 is communicated with the steam turbine set 3;
the third program control switch 23 is communicated with the pressurizer 4, and the pressurizer 4 raises the steam pressure and stores the steam pressure into the pressure-resistant heat-preservation cabin 5;
as shown in fig. 2-3, the compressor 4 includes a pressure-resistant pipe 41 communicated with the third program-controlled switch 23, the pressure-resistant pipe 41 is connected in parallel with a large pressure cylinder 42 and a small pressure cylinder 43 in sequence, a large piston 44 and a small piston 45 are respectively arranged inside the large pressure cylinder 42 and the small pressure cylinder 43, the large piston 44 and the small piston 45 are respectively hinged with two ends of a balancing rod 48 through transmission rods 46 and 47, and the balancing rod 48 is rotatably connected with the base;
two sides of the communication part of the small pressure cylinder 43 and the pressure pipe 41 are respectively provided with a one- way valve 49, 410, and the one- way valves 49, 410 are opened towards the pressure-resistant heat-preservation cabin 5 in one way;
as shown in fig. 5-6, the check valve 49, 410 includes a valve body 411 fixed in a sealing manner with the pressure pipe 41, a conical cavity 412 with an opening facing the pressure-resistant insulation chamber 5 is formed in the valve body 411, a conical valve core 413 with the same taper angle is arranged in the conical cavity 412, a blocking block 414 is fixed at the opening end of the conical cavity 412, the conical valve core 413 and the blocking block 414 are provided with an elastic member 415, and the elastic member 415 presses the conical valve core 413 to be in sealing contact with each other just under the action of no external force.
As shown in fig. 3-4, the compressor 4 cycles through the following steps under the control of the programmable valve 2:
opening the first program-controlled switch 21 and the third program-controlled switch 23, closing the second program-controlled switch 22, the steam from the photothermal conversion device 1 enters the large pressure cylinder 42 and the small pressure cylinder 43, and the first check valve 49 is opened, and the second check valve 410 is closed because the pressure-resistant heat-preserving chamber 5 is higher than the steam pressure in the pipeline at that time;
because the area of the large piston 44 is larger than that of the small piston 45, under the condition that the large piston 44 and the small piston 45 are subjected to the same pressure, the steam in the small pressure cylinder 43 is compressed through the transmission action of the transmission rods 46 and 47 and the balance rod 48, at the moment, the first one-way valve 49 is closed, when the pressure of the compressed steam is larger than that in the pressure-resistant heat-preservation cabin 5, the second one-way valve 410 is opened, high-pressure steam is stored, the area ratio of the large piston 44 to the small piston 45 is changed, and the multiple of steam compression can be adjusted;
opening the second program-controlled switch 22 and the third program-controlled switch 23, closing the first program-controlled switch 21, allowing the steam in the pressure pipe 41 and the large piston 44 to enter the relatively low-pressure steam turbine set 3 and push the steam to rotate to generate electricity, and resetting the large piston 44 and the small piston 45 after the pressure is reduced.
As shown in fig. 4, graphs showing changes in the internal air pressure of the large piston 44 and the small piston 45, respectively, are shown.
In the above process, the following operations are performed:
when the first program-controlled switch 21 and the third program-controlled switch 23 are opened and the second program-controlled switch 22 is closed, the operation is continued until the large piston 44 and the small piston 45 impact the pressure cylinders 42 and 43, and the required time T is recorded1；
When the operations of opening the second program-controlled switch 22 and the third program-controlled switch 23 and closing the first program-controlled switch 21 are performed, the operations are continued until the large piston 44 and the small piston 45 strike the pressure cylinders 42 and 43, and the required time T is recorded2，
Decrease T step by step in equal proportion1And T2So that the velocity of the large piston 44 and the small piston 45 is zero at the end of the inner chamber of the pressure cylinder 42, 43 at the instant when the programming valve 2 performs the opening and closing action.
In the above-mentioned operation, compare traditional mode, not only avoid blockking up the thermal cycle pipeline, can also high density storage energy simultaneously.
In the description herein, references to the terms "one embodiment," "an example," "a specific example," 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 the invention. In this specification, the schematic representations of the terms used above do not necessarily 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.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a new energy solar energy power generation is with peak regulation energy storage system, includes light and heat conversion equipment (1), its characterized in that: the photo-thermal conversion device (1) is heated and then transmits steam to the program control valve (2), the program control valve (2) transmits part of the steam to the steam turbine set (3) for power generation, and the steam higher than the load demand part is stored in the pressure-resistant heat-insulation bin (5) in a pressurized mode;
and the pressure-resistant heat-insulating bin (5) is used for conveying high-pressure steam to the steam turbine set (3) when the input steam pressure of the steam turbine set is not enough to meet the load requirement.
2. The system of claim 1, wherein: the programmable valve (2) comprises three programmable switches (21, 22, 23);
the first program control switch (21) is communicated with the photo-thermal conversion device (1);
the second program control switch (22) is communicated with the steam turbine set (3);
the third program-controlled switch (23) is communicated with a pressurizer (4), and the pressurizer (4) raises the steam pressure and stores the steam pressure into a pressure-resistant heat-preservation cabin (5);
the program control valve (2) sequentially and circularly executes the following steps:
the first program-controlled switch (21) and the third program-controlled switch (23) are turned on, the second program-controlled switch (22) is turned off, the steam from the photothermal conversion device (1) enters the pressurizer (4), the pressurized steam enters the pressure-resistant heat-insulating bin (5) for storage,
and opening the second program-controlled switch (22) and the third program-controlled switch (23), closing the first program-controlled switch (21), and allowing the unpressurized steam in the pressurizer (4) to enter the steam turbine set (3) and drive the steam turbine set to rotate to generate power.
3. The system of claim 2, wherein: the compressor (4) comprises a pressure-resistant pipe (41) communicated with the third program-controlled switch (23), the pressure-resistant pipe (41) is sequentially connected with a large pressure cylinder (42) and a small pressure cylinder (43) in parallel, a large piston (44) and a small piston (45) are respectively arranged in the large pressure cylinder (42) and the small pressure cylinder (43), the large piston (44) and the small piston (45) are respectively hinged with two ends of a balancing rod (48) through transmission rods (46, 47), and the balancing rod (48) is rotatably connected with a base;
two sides of the communication part of the small pressure cylinder (43) and the pressure-resistant pipe (41) are respectively provided with a one-way valve (49, 410), and the one-way valves (49, 410) are opened towards the pressure-resistant heat-preservation cabin (5) in one way;
the compressor (4) cyclically executes the following steps under the control of the programmable valve (2):
-opening the first programmable switch (21) and the third programmable switch (23), closing the second programmable switch (22), the steam from the photothermal conversion device (1) enters the large pressure cylinder (42) and the small pressure cylinder (43), and the first one-way valve (49) is opened, and the second one-way valve (410) is closed because the pressure-resistant heat-preservation cabin (5) is higher than the steam pressure in the pipeline at the moment;
because the area of the large piston (44) is larger than that of the small piston (45), under the condition that the large piston and the small piston are subjected to the same pressure, the steam in the small pressure cylinder (43) is compressed through the transmission action of the transmission rods (46 and 47) and the balance rod (48), at the moment, the first one-way valve (49) is closed, when the pressure of the compressed steam is larger than that in the pressure-resistant heat-preservation bin (5), the second one-way valve (410) is opened, high-pressure steam is stored, the area ratio of the large piston (44) to the small piston (45) is changed, and the multiple of steam compression can be adjusted;
-opening the second program-controlled switch (22) and the third program-controlled switch (23), closing the first program-controlled switch (21), allowing the pressure line (41) and the steam in the large piston (44) to enter the relatively low-pressure steam turbine set (3), and allowing the large piston (44) and the small piston (45) to return after the pressure is reduced.
4. The system of claim 3, wherein: the programmable valve (2) executes the opening of the first programmable switch (21) and the third programmable switch (23), and the duration of the closing of the second programmable switch (22) is T1The second program-controlled switch (22) and the third program-controlled switch (23) are opened, and the duration of closing the first program-controlled switch (21) is T2；
Adjusting T1And T2Such that the velocity of the large piston (44) and the small piston (45) is zero at the end of the pressure cylinder (42, 43) chamber at the instant of each opening and closing movement performed by the programmable valve (2).
5. The system of claim 4, wherein: the adjustment T1And T2The numerical values of (a) specifically include,
when the first program-controlled switch (21) and the third program-controlled switch (23) are turned on and the second program-controlled switch (22) is turned off, the operation is continued until the large piston (44) and the small piston (45) impact the pressure cylinders (42, 43), and the required time T is recorded1；
When the second program-controlled switch (22) and the third program-controlled switch (23) are opened and the first program-controlled switch (21) is closedThe operation is continued until the large piston (44) and the small piston (45) strike the pressure cylinder (42, 43), and the time T required is recorded2，
Decrease T step by step in equal proportion1And T2Such that the velocity of the large piston (44) and the small piston (45) is zero at the end of the pressure cylinder (42, 43) chamber at the instant of each opening and closing movement performed by the programmable valve (2).
6. The system of claim 3, wherein: the check valve (49, 410) comprises a valve body (411) which is fixed with the pressure-resistant pipe (41) in a sealing mode, a conical cavity (412) with an opening facing the pressure-resistant heat-preservation bin (5) is formed in the valve body (411), a conical valve core (413) with the same cone angle is arranged in the conical cavity (412), and a blocking block (414) is fixed at the opening end of the conical cavity (412).
7. The system of claim 6, wherein: the cone valve core (413) and the blocking block (414) are provided with elastic pieces (415), and under the action of no external force, the elastic pieces (415) press the cone valve core (413) to be in just sealing contact.
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