CN110887392A - Molten salt electric heat storage power generation system with supercritical carbon dioxide as cycle working medium - Google Patents
Molten salt electric heat storage power generation system with supercritical carbon dioxide as cycle working medium Download PDFInfo
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- CN110887392A CN110887392A CN201911168145.1A CN201911168145A CN110887392A CN 110887392 A CN110887392 A CN 110887392A CN 201911168145 A CN201911168145 A CN 201911168145A CN 110887392 A CN110887392 A CN 110887392A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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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
- F01K25/103—Carbon dioxide
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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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
- Y02E60/14—Thermal energy storage
Abstract
The invention provides a molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium, which comprises a supercritical carbon dioxide Brayton cycle power generation unit, a molten salt single storage tank, a molten salt heat exchanger, an electric heating pipe, a power supply control assembly, a supercritical carbon dioxide conveying pipeline, molten salt and a molten salt electric pushing device, wherein the supercritical carbon dioxide Brayton cycle power generation unit is connected with a heat exchange medium inlet and a heat exchange medium outlet on the molten salt heat exchanger through the supercritical carbon dioxide conveying pipeline to form the supercritical carbon dioxide Brayton cycle power generation system. Compared with the traditional pumped storage power station and electrochemical energy storage, the technology has the advantages of safety, economy, flexibility, strong regulating capacity, short construction period, low site selection requirement, flexible construction scale and the like, and opens a brand new application field for the electric heat storage peak shaving power station.
Description
Technical Field
The invention discloses a molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium, in particular relates to a molten salt electric heat storage power generation device which abandons wind and light and heats valley electricity and takes supercritical CO2 as a working medium, and belongs to the technical field of a supercritical carbon dioxide Brayton circulating system and molten salt electric heat storage power generation.
Background
With the social development and the improvement of the living standard of people, the day-night difference of electricity utilization structures in China is larger and larger, the demand of peak shifting and valley filling is stronger, and the phenomena of wind abandoning and light abandoning are more and more serious; the economic speed-increasing gear-shifting of China develops a new normal state step by step, and the industrial structure is gradually converted from a middle-low end to a middle-high end. The adjustment of the industrial structure leads to the continuous increase of the power consumption ratio of the third industry and the urban and rural residents, the power consumption characteristic determines that the peak-valley difference rate of the load curve is obviously higher than that of the second industry, the power consumption side peak-valley difference rate of China has a trend of going high, and the construction demand of the adjustable power supply is continuously increased. Pumped storage power stations and electrochemical energy storage are one of the most effective means for peak and valley shifting.
From the actual operating situation, both pumped-storage power stations and electrochemical energy storage power stations face a series of problems, for example, there are currently three main problems in pumped-storage power stations: firstly, the current source-network-load coordinated development level needs to be improved, and the difficulty of accurate planning and reasonable layout of the pumped storage power station is increased; secondly, the cost of the pumped storage power station is difficult to dredge; and thirdly, in areas with large development requirements of the pumped storage power station, the site resources are insufficient. The electrochemical energy storage has obvious disadvantages in economy and safety, and can not replace pumped storage within a certain period. In recent years, the electrochemical energy storage market in China develops rapidly, but due to the restrictions of economy and safety, the electrochemical energy storage cannot be popularized on a large scale. According to the prediction results of multiple authorities comprehensively, the economy of electrochemical energy storage is still lower than that of pumped storage before 2030 years, and even lead-carbon batteries and lithium ion batteries with better economy in electrochemical energy storage have electricity consumption cost 1.5 times and 2.5 times higher than that of pumped storage. In addition, at present, electrochemical energy storage still has great potential safety hazard, fire-fighting risk safety assessment and plan measure related to electrochemical energy storage are short of order, the technical level of a battery management system is uneven, and multiple energy storage power station explosion and fire accidents have occurred since 2018.
In general, the supply side innovation in the field of steady-step propulsion energy is a main line for realizing high-quality development of energy and electric power. The large-scale development of new energy, the cross-provincial and trans-regional channel configuration, the mutual economic capacity construction and the like all put higher requirements on the power grid regulation capacity and the like.
Firstly, new energy and nuclear power are connected in parallel to operate, so that the adjusting capacity of a power system is reduced, and the power grid balancing capacity is challenged. In addition, the nuclear power grid-connected operation can also reduce the starting capacity of the conventional power supply, and influence the release of the flexibility of the conventional power supply, thereby further reducing the overall balance capability of the system.
And secondly, an extra-high voltage power transmission channel is developed, and a large flexible power supply is needed to provide rapid power reserve.
Carbon dioxide has a very unique physical property: when the temperature reaches 30.98 ℃ and the pressure reaches 7.38MPa, the physical state is between that of liquid and gas, the density is close to that of liquid, the viscosity is close to that of gas, and the diffusion coefficient is about 100 times that of the liquid. This state is referred to as the "supercritical" state. The carbon dioxide in a supercritical state has the characteristics of high density compared with gas, low viscosity compared with liquid, strong liquidity, high heat transfer efficiency, low compressibility and the like. The critical condition of carbon dioxide is easy to reach, chemical property is inactive, and the product is colorless, tasteless, nontoxic, safe, cheap, high in purity and easy to obtain. These properties make it well suited for use as a thermodynamic cycle fluid.
In the beginning of 2019, a 10MW supercritical carbon dioxide turbine developed by the United states of research institute of southwest USA in combination with GE successfully passes the test; tests prove that the power generation system using the S-CO2 as the working medium can have good performance when running in the temperature range of 600-700 ℃, can realize high-efficiency heat energy utilization under the atmospheric pressure of more than 500 ℃ and 20MPa, and has the heat efficiency of more than 45%. It is expected that under the efforts of national research units, the supercritical carbon dioxide Brayton cycle system with independent intellectual property rights is developed in China.
In view of the technical reasons, a fused salt electric heat storage peak regulation power station using supercritical carbon dioxide as a working medium is needed in the market, and the fused salt electric heat storage peak regulation power station has the characteristics of safety, economy, flexibility, strong regulation capacity, short construction period, low site selection requirement, flexible construction scale and the like.
Disclosure of Invention
Compared with the traditional pumped storage power station and electrochemical energy storage, the technology has the characteristics of safety, economy, flexibility, strong regulating capacity, short construction period, low site selection requirement, flexible construction scale and the like, and opens a brand new application field for the electric heat storage peak shaving power station.
In order to achieve the purpose, the invention adopts the technical scheme that: a fused salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium comprises a supercritical carbon dioxide Brayton cycle generator set, a fused salt single storage tank, a fused salt heat exchanger, an electric heating pipe, a power supply control assembly, a supercritical carbon dioxide conveying pipeline, fused salt and a fused salt electric pushing device, and is characterized in that the electric heating pipe and the fused salt are arranged in the fused salt single storage tank; the electric heating pipe is a high-temperature electric heater and is connected with the power supply control assembly, and the electric heating section of the electric heating pipe is positioned below the liquid level of the molten salt; the side surface of the upper part of the molten salt single storage tank is provided with a plurality of hot molten salt outlets below a molten salt liquid level line, and the side surface of the lower bottom of the molten salt single storage tank is provided with a plurality of cold molten salt inlets; the molten salt heat exchanger is integrally in a vertical storage tank shape and is arranged around the molten salt single storage tank, a cold molten salt outlet is arranged on a central axis at the bottom of the molten salt single storage tank, a hot molten salt inlet is arranged on the side surface of the upper part of the molten salt single storage tank, and a heat exchange medium inlet and a heat exchange medium outlet are also arranged on the side surface of the upper part of the molten salt single storage tank; the cold molten salt outlet is communicated with the cold molten salt inlet, and the hot molten salt inlet is communicated with the hot molten salt outlet; the molten salt electric pushing device is arranged on a central axis of the molten salt heat exchanger, or on a connecting pipeline between the hot molten salt inlet and the hot molten salt outlet, or on a connecting pipeline between the cold molten salt outlet and the cold molten salt inlet, and molten salt is forced to flow through the molten salt heat exchanger by the molten salt electric pushing device to complete heat exchange circulation of the molten salt and a heat exchange medium; the supercritical carbon dioxide Brayton cycle generator set is connected with a heat exchange medium inlet and a heat exchange medium outlet on the molten salt heat exchanger through the supercritical carbon dioxide conveying pipeline to form a supercritical carbon dioxide Brayton cycle power generation system. Usually, the tank cover is further provided with a plurality of interfaces communicated with the tank body, and the plurality of interfaces communicated with the storage tank can be used as a normal pressure outlet, a molten salt filling port, a socket of a temperature sensor or an insertion port of a molten salt liquid level meter. Usually, a molten salt pump is also one of the molten salt electric propulsion devices.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the molten salt heat exchanger is integrally in a vertical storage tank shape and is arranged around the molten salt single storage tank, a cold molten salt outlet is arranged on a central axis line at the bottom of the molten salt single storage tank, a hot molten salt inlet is arranged on the side surface of the upper part of the molten salt single storage tank, a heat exchange medium inlet and a heat exchange medium outlet are also arranged on the molten salt single storage tank, the molten salt heat exchanger comprises a funnel-shaped heat exchanger shell, a heat exchanger cover and a heat exchange coil pipe, the heat exchange coil pipe is arranged in the heat exchanger shell, the heat exchanger cover is arranged at the top of the heat exchanger shell and is in sealed connection with the heat exchanger shell, a guide cylinder is arranged at the bottom of the heat exchanger cover and penetrates through a central neutral position of the heat exchange; the two ends of the heat exchange coil are respectively connected with a heat exchange medium inlet and a heat exchange medium outlet; the electric molten salt pushing device is arranged on a central axis of the heat exchanger cover and at least comprises a variable frequency motor, a rotating shaft and a paddle, wherein the upper end of the rotating shaft is connected with the variable frequency motor after penetrating through the sleeve, the lower end of the rotating shaft is connected with the paddle, the paddle is positioned in a cold molten salt outlet, and the paddle can form downward pushing force when rotating.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the supercritical CO2 Brayton cycle generator set comprises a generator, a turbine, a secondary compressor, a primary compressor, a precooling or condenser, a low-temperature heat regenerator, a high-temperature heat regenerator and a supercritical CO2 conveying pipeline. The closed-loop supercritical CO2 Brayton cycle power generation system mainly comprises a compression system, a precooling system, a heat exchange system, a heat source, a turbine, a generator and the like. The low-temperature low-pressure gas is boosted by the compressor, then enters the heat source after being preheated by the high-temperature side of the heat regenerator, directly enters the turbine for acting after absorbing a large amount of heat, the turbine drives the generator system to generate electricity, and the exhaust gas after acting is cooled by the fluid at the low-temperature side of the heat regenerator, then is cooled by the cooler to the required inlet temperature of the compressor, and enters the compressor to form closed circulation.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the top opening of the heat exchanger shell is higher than the molten salt liquid level line in the molten salt single storage tank. Generally, such a design can greatly reduce the difficulty of sealing the molten salt heat exchanger.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: and a heat insulation layer is arranged in the inner cavity of the guide shell.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the heat exchanger shell and the heat exchanger cover are hermetically connected in a flange mode.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: and heat conducting fins are arranged on the surface of the heat exchange coil.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: and a temperature probe is arranged in the molten salt single storage tank or the molten salt heat exchanger.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the molten salt is high-purity chloride molten salt treated by active metal, wherein the active metal comprises at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc and iron, and the high-purity chloride molten salt comprises at least one of NaCl, KCl, MgCl2 and CaCl 2. The higher the temperature of the supercritical carbon dioxide working medium is, the higher the thermal efficiency is, when the temperature of the supercritical carbon dioxide working medium reaches 700 ℃, the thermal efficiency can reach more than 50%, the upper limit of the use temperature of the existing nitrate fused salt is generally controlled below 550 ℃, and the upper limit of the usable temperature of the high-purity chloride fused salt is close to 800 ℃, so that the high-purity chloride fused salt is the ultrahigh-temperature fused salt.
The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium is characterized in that: the molten salt is high-purity carbonate or a carbonate mixture.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be 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 to obtain other drawings based on these drawings without creative efforts. The drawings are only for reference and illustration purposes and are not intended to limit the invention.
FIG. 1 is a schematic structural diagram of a molten salt electric heat storage power generation system with supercritical carbon dioxide as a cycle fluid, provided by the invention;
FIG. 2 is a schematic structural diagram of a supercritical CO2 Brayton cycle generator set provided by the invention;
FIG. 3 is a schematic structural diagram of a molten salt single storage tank, a molten salt heat exchanger, a molten salt electric pushing device and an electric heating pipe which are provided by the invention after being combined;
FIG. 4 is a schematic structural diagram of a heat exchange coil provided by the present invention;
FIG. 5 is a schematic structural diagram of a molten salt heat exchanger provided by the present invention;
FIG. 6 is a view of a combination of a guide shell and a heat exchanger cover according to the present invention;
fig. 7 is a schematic structural diagram of a guide shell provided by the invention.
In the figure: the device comprises a supercritical CO2 Brayton cycle generator set 1, a molten salt single storage tank 2, a hot molten salt outlet 2a, a cold molten salt inlet 2b, a molten salt heat exchanger 3, an electric heating pipe 4, a power supply control assembly 5, a supercritical carbon dioxide conveying pipeline 6, molten salt 7, a molten salt electric pushing device 8, a variable frequency motor 8a, a rotating shaft 8b, blades 8c, a temperature probe 9, a generator 10, a turbine 11, a secondary compressor 12, a primary compressor 13, a precooling or condenser 14, a low-temperature regenerator 15, a high-temperature regenerator 16, a cold molten salt outlet 30, a hot molten salt inlet 31, a heat exchange medium inlet 32, a heat exchange medium outlet 33, a heat exchanger shell 34, a heat exchanger cover 35, a guide cylinder 35a, a sleeve 35b, a heat insulation layer 35c, a heat exchange coil 36 and heat conduction fins.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example (b):
as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the molten salt electric heat storage power generation system using supercritical carbon dioxide as a cycle fluid comprises a supercritical carbon dioxide brayton cycle generator set 1, a molten salt single storage tank 2, a molten salt heat exchanger 3, an electric heating pipe 4, a power supply control assembly 5, a supercritical carbon dioxide conveying pipeline 6, a molten salt 7 and a molten salt electric pushing device 8.
The electric heating pipe 4 and the fused salt 7 are arranged in the fused salt single storage tank 2; the electric heating pipe 4 is a high-temperature electric heater and is connected with the power supply control assembly 5, and the electric heating section of the electric heating pipe is positioned below the liquid level of the molten salt 7; the side surface of the upper part of the molten salt single storage tank 2 is provided with a plurality of hot molten salt outlets 2a which are positioned below the molten salt liquid level line, and the side surface of the lower bottom of the molten salt single storage tank is provided with a plurality of cold molten salt inlets 2 b.
The molten salt heat exchanger 3 is integrally in a vertical storage tank shape and is arranged around the molten salt single storage tank 2, a cold molten salt outlet 30 is arranged on a central axis at the bottom of the molten salt single storage tank, a hot molten salt inlet 31 is arranged on the side surface of the upper part of the molten salt single storage tank, and a heat exchange medium inlet 32 and a heat exchange medium outlet 33 are also arranged; the cold molten salt outlet 30 is communicated with the cold molten salt inlet 2b, and the hot molten salt inlet 31 is communicated with the hot molten salt outlet 2 a; the molten salt heat exchanger 3 comprises a funnel-shaped heat exchanger shell 34, a heat exchanger cover 35 and a heat exchange coil 36, wherein the heat exchange coil 35 is arranged in the heat exchanger shell 34, the heat exchanger cover 35 is arranged at the top of the heat exchanger shell 34 and is in sealing connection with the heat exchanger shell 34, a guide cylinder 35a is arranged at the bottom of the heat exchanger cover 35, the guide cylinder 35a penetrates through the central neutral position of the heat exchange coil 35, a sleeve 35b is arranged on the central axis of the guide cylinder 35a, and the sleeve 35b integrally penetrates through the heat exchanger cover 35; the two ends of the heat exchange coil 36 are respectively connected with a heat exchange medium inlet 32 and a heat exchange medium outlet 33; the molten salt electric pushing device 8 is arranged on a central axis of the heat exchanger cover 35 and at least comprises a variable frequency motor 8a, a rotating shaft 8b and a blade 8c, after the rotating shaft 8b penetrates through the sleeve 35b, the upper end of the rotating shaft 8b is connected with the variable frequency motor 8a, the lower end of the rotating shaft is connected with the blade 8c, the blade 8c is positioned in the cold molten salt outlet 30, the blade 8c can form downward pushing force when rotating, and the molten salt 7 is forced to flow through a heat exchange coil 36 in the molten salt heat exchanger 3 through the molten salt electric pushing device 8 so as to complete heat exchange circulation of the molten salt and a heat exchange medium; the supercritical carbon dioxide Brayton cycle generator set 1 is connected with the heat exchange medium inlet 32 and the heat exchange medium outlet 33 on the molten salt heat exchanger 3 through the supercritical carbon dioxide conveying pipeline 6 to form a supercritical carbon dioxide Brayton cycle power generation system.
In this embodiment, the supercritical carbon dioxide brayton cycle generator set 1 includes a generator 10, a turbine 11, a secondary compressor 12, a primary compressor 13, a precooling or condenser 14, a low-temperature regenerator 15, and a high-temperature regenerator 16.
In this embodiment, the top opening of the heat exchanger shell 34 is higher than the molten salt liquid level line in the molten salt single storage tank 2.
In this embodiment, a heat insulation layer 35c is disposed in the inner cavity of the guide shell 35 a.
In this embodiment, the heat exchanger housing 34 and the heat exchanger cover 35 are both connected in a flange-type sealing manner.
In this embodiment, heat conducting fins 36a are disposed on the surface of the heat exchanging coil 36.
In this embodiment, a temperature probe 9 is provided in the molten salt single storage tank 2 or the molten salt heat exchanger 3.
In this embodiment, the molten salt 7 is a high-purity chloride molten salt treated with an active metal, where the active metal includes at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc, and iron, and the high-purity chloride molten salt includes at least one of NaCl, KCl, MgCl2, and CaCl 2.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms of supercritical CO2 brayton cycle generator set, molten salt single storage tank, hot molten salt outlet, cold molten salt inlet, molten salt heat exchanger, electric heating pipe, power control assembly, supercritical carbon dioxide conveying pipeline, molten salt electric pusher, variable frequency motor, rotating shaft, blade, temperature probe, generator, turbine, secondary compressor, primary compressor, precooler or condenser, low temperature regenerator, high temperature regenerator, cold molten salt outlet, hot molten salt inlet, heat exchange medium outlet, heat exchanger shell, heat exchanger cover, draft tube, casing, thermal insulation layer, heat exchange coil, heat conduction fin, etc. are used more often, the possibility of using other terms is not excluded. The present technology uses molten salt as a heat storage material, but is not limited to molten salt, and these terms are used only for the purpose of more conveniently describing and explaining the essence of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium comprises a supercritical carbon dioxide Brayton cycle generator set (1), a molten salt single storage tank (2), a molten salt heat exchanger (3), an electric heating pipe (4), a power control assembly (5), a supercritical carbon dioxide conveying pipeline (6), molten salt (7) and a molten salt electric pushing device (8), and is characterized in that the electric heating pipe (4) and the molten salt (7) are arranged in the molten salt single storage tank (2); the electric heating pipe (4) is a high-temperature electric heater and is connected with a power supply control assembly (5), and the electric heating section of the electric heating pipe is positioned below the liquid level of the molten salt (7); the side surface of the upper part of the molten salt single storage tank (2) is provided with a plurality of hot molten salt outlets (2 a) below the molten salt liquid level line, and the side surface of the lower bottom of the molten salt single storage tank is provided with a plurality of cold molten salt inlets (2 b); the molten salt heat exchanger (3) is integrally in a vertical storage tank shape and is arranged around the molten salt single storage tank (2), a cold molten salt outlet (30) is arranged on a central axis at the bottom of the molten salt single storage tank, a hot molten salt inlet (31) is arranged on the side surface of the upper part of the molten salt single storage tank, and a heat exchange medium inlet (32) and a heat exchange medium outlet (33) are also arranged; the cold molten salt outlet (30) is communicated with the cold molten salt inlet (2 b), and the hot molten salt inlet (31) is communicated with the hot molten salt outlet (2 a); the molten salt electric pushing device (8) is arranged on the central axis of the molten salt heat exchanger (3), or on a connecting pipeline between the hot molten salt inlet (31) and the hot molten salt outlet (2 a), or on a connecting pipeline between the cold molten salt outlet (30) and the cold molten salt inlet (2 b), and the molten salt (7) is forced to flow through the molten salt heat exchanger (3) through the molten salt electric pushing device (8) to complete a heat exchange cycle of the molten salt and a heat exchange medium; the supercritical carbon dioxide Brayton cycle generator set (1) is connected with a heat exchange medium inlet (32) and a heat exchange medium outlet (33) on the molten salt heat exchanger (3) through the supercritical carbon dioxide conveying pipeline (6) to form a supercritical carbon dioxide Brayton cycle power generation system.
2. The fused salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium according to claim 1, characterized in that the fused salt heat exchanger (3) is integrally in a vertical storage tank shape, is arranged around the fused salt single storage tank (2), is provided with a cold fused salt outlet (30) on a central axis at the bottom, is provided with a hot fused salt inlet (31) on the upper side, is further provided with a heat exchange medium inlet (32) and a heat exchange medium outlet (33), and comprises a funnel-shaped heat exchanger shell (34), a heat exchanger cover (35) and a heat exchange coil (36), the heat exchange coil (35) is arranged in the heat exchanger shell (34), the heat exchanger cover (35) is arranged at the top of the heat exchanger shell (34) and is in sealing connection with the heat exchanger shell and the heat exchanger cover, the bottom of the heat exchanger cover (35) is provided with a guide cylinder (35 a), and the guide cylinder (35 a) passes through a central neutral position of the heat exchange coil (, a sleeve (35 b) is arranged on the central axis of the guide cylinder (35 a), and the sleeve (35 b) integrally penetrates through the heat exchanger cover (35); the two ends of the heat exchange coil (36) are respectively connected with a heat exchange medium inlet (32) and a heat exchange medium outlet (33); the fused salt electric pushing device (8) is arranged on the central axis of the heat exchanger cover (35) and at least comprises a variable frequency motor (8 a), a rotating shaft (8 b) and a blade (8 c), after the rotating shaft (8 b) penetrates through the sleeve (35 b), the upper end of the rotating shaft is connected with the variable frequency motor (8 a), the lower end of the rotating shaft is connected with the blade (8 c), the blade (8 c) is located in the cold fused salt outlet (30), and downward pushing force can be formed when the blade (8 c) rotates.
3. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium according to claim 1, wherein the supercritical carbon dioxide brayton cycle generator set (1) comprises a generator (10), a turbine (11), a secondary compressor (12), a primary compressor (13), a precooling or condensing unit (14), a low-temperature heat regenerator (15) and a high-temperature heat regenerator (16).
4. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating fluid as claimed in claim 2, characterized in that the top opening of the heat exchanger shell (34) is higher than the molten salt liquid level in the molten salt single storage tank (2).
5. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium according to claim 2, characterized in that a heat insulation layer (35 c) is arranged in an inner cavity of the guide shell (35 a).
6. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating fluid as claimed in claim 2, characterized in that the heat exchanger shell (34) and the heat exchanger cover (35) are hermetically connected in a flange manner.
7. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating fluid as claimed in claim 2, characterized in that heat conducting fins (36 a) are arranged on the surface of the heat exchange coil (36).
8. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating working medium according to claim 1, characterized in that a temperature probe (9) is arranged in the molten salt single storage tank (2) or the molten salt heat exchanger (3).
9. The molten salt electric heat storage power generation system using supercritical carbon dioxide as a cycle fluid according to claim 1, characterized in that the molten salt (7) is a high purity chloride molten salt treated by active metal, wherein the active metal comprises at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc and iron, and the high purity chloride molten salt comprises at least one of NaCl, KCl, MgCl2 and CaCl 2.
10. The molten salt electric heat storage power generation system taking supercritical carbon dioxide as a circulating fluid according to claim 1, characterized in that the molten salt (7) is high-purity carbonate or a carbonate mixture.
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| CN201911168145.1A CN110887392A (en) | 2019-11-25 | 2019-11-25 | Molten salt electric heat storage power generation system with supercritical carbon dioxide as cycle working medium |
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| CN201911168145.1A CN110887392A (en) | 2019-11-25 | 2019-11-25 | Molten salt electric heat storage power generation system with supercritical carbon dioxide as cycle working medium |
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