CN113318675A - Salt melting system of solar thermal power station based on heat conduction oil heat collection field - Google Patents
Salt melting system of solar thermal power station based on heat conduction oil heat collection field Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 346
- 238000002844 melting Methods 0.000 title claims abstract description 129
- 230000008018 melting Effects 0.000 title claims abstract description 129
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 29
- 239000007787 solid Substances 0.000 description 19
- 239000003345 natural gas Substances 0.000 description 14
- 238000010248 power generation Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 8
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 8
- 238000005338 heat storage Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 230000005611 electricity Effects 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 239000002803 fossil fuel Substances 0.000 description 4
- 239000004323 potassium nitrate Substances 0.000 description 4
- 235000010333 potassium nitrate Nutrition 0.000 description 4
- 239000004317 sodium nitrate Substances 0.000 description 4
- 235000010344 sodium nitrate Nutrition 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/005—Fusing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/30—Solar heat collectors using working fluids with means for exchanging heat between two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
-
- 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
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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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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- 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
- Y02E10/44—Heat exchange systems
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Abstract
A salt melting system of a solar thermal power station based on a heat-conducting oil heat collection field belongs to the technical field of photothermal salt melting production. The invention aims to shorten the salt dissolving period and reduce the salt dissolving cost. The heat-conducting oil-salt solar heat collection system comprises a salt melting furnace, a heat exchanger and a molten salt storage tank, wherein the salt melting furnace is communicated with a low-temperature molten salt inlet of the heat exchanger through a molten salt pipeline, the salt melting furnace is communicated with the molten salt storage tank through a delivery pump, a high-temperature molten salt outlet of the heat exchanger is communicated with the salt melting furnace, the heat exchanger is connected with a heat-conducting oil solar heat collection field, the heat-conducting oil solar heat collection field is used for providing a heat exchange heat source for the heat exchanger, and the heat exchanger can be an oil-salt heat exchanger, can also be replaced by an electric heater, and can also be a heat collection system for directly heating molten salt through photo-heat. The salt melting is realized in a photo-thermal mode, the salt melting speed is obviously improved, and the system is simple in structure, simple and convenient to operate, high in safety, energy-saving, environment-friendly, clean and efficient.
Description
Technical Field
The invention relates to a solar thermal power station molten salt melting system, and belongs to the technical field of salt melting systems.
Background
Before being put into a solar photoelectric power station, the molten salt is mainly supplied in a solid form, and the molten salt is conveniently transported and stored by supplying in the solid form. When the fused salt needs to be put into the solar photo-thermal power station, a large amount of solid fused salt needs to be converted into liquid fused salt, the fused salt is subjected to initial melting, the initial melting of the fused salt is a key procedure before the fused salt heat storage system of the photo-thermal power station enters debugging operation, the fused salt is changed into liquid high-temperature fused salt from a solid state through the flow, enters the system and starts to circulate, and the fused salt is kept in a liquid state in the service life of the whole power station.
In the existing photothermal solar thermal power station, two schemes for realizing salt melting are available, one scheme is that after an electric heater is adopted for salt initialization, a molten salt circulating pump is used for pumping low-temperature liquid molten salt into a natural gasified salt furnace, and high-temperature flue gas generated by burning natural gas is used for heating the molten salt in a coil pipe in the molten salt furnace to a high-temperature state and then conveying the molten salt back to a molten salt tank. Adding sodium nitrate and potassium nitrate (solid molten salt) into the molten salt tank in proportion, and when the temperature of the molten salt in the molten salt tank meets the requirement, conveying the molten salt to a molten salt tank through another molten salt conveying pump; and secondly, sodium nitrate and potassium nitrate are crushed and mixed in proportion and then directly enter a natural gasified salt furnace, a heat exchange coil is arranged in a hearth, high-temperature flue gas is contained in the heat exchange coil, the flowing direction of the high-temperature flue gas is opposite to the stirring direction of liquid in the furnace, and melted liquid molten salt overflows into a buffer tank through an overflow pipe and then is pumped into a molten salt tank from the buffer tank. The two traditional salt melting modes both use flue gas obtained after natural gas combustion as a heat source for heating solid molten salt particles, and a large amount of natural gas is consumed in the salt melting process. The salt melting speed is about 30-40 t/h due to the technical limit of the natural gas furnace and the safety consideration. After salt dissolving is finished, the matched salt dissolving equipment has no utilization value in the project, and can only be used for the next project to carry out secondary salt dissolving or waste after shelving.
In addition to the above statements, the conventional salt formation process has the following disadvantages:
1. the built salt melting furnace system for melting salt by using a natural gas heating mode has higher cost, and after primary salt melting is realized, the molten salt is put into a solar photo-thermal system for use, and secondary salt melting is not needed, so that matched natural gas salt melting furnace system equipment cannot be reasonably used;
2. when the natural gasified salt furnace system is used for realizing salt melting, natural gas needs to be combusted, and the cost of the consumed natural gas is high in a tens of thousands of tons of large-scale photo-thermal power station molten salt projects;
3. the natural gasified salt furnace system is used for burning natural gas, so that the discharged carbon dioxide is large, and the environment is polluted to a certain extent;
4. the temperature raising capability of a natural gasification salt furnace system is limited, and the salt melting speed is low and the salt melting period is long in a tens of thousands-ton large-scale photo-thermal power station molten salt project.
Based on the above situation, the research work of the salt dissolving technical scheme is developed, and the method has very important significance for shortening the salt dissolving period, reducing the salt dissolving cost, improving the salt dissolving speed and quality and ensuring that both the photo-thermal power generation and the salt dissolving are not wrong.
Disclosure of Invention
The invention aims to shorten the salt dissolving period and reduce the salt dissolving cost. The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.
The technical scheme of the invention is as follows:
the heat conduction oil heat collection field-based salt melting system of the solar thermal power station comprises a salt melting furnace, a heat exchanger and a molten salt storage tank, wherein the heat exchanger is provided with a molten salt inlet, a molten salt outlet, a heat source outlet and a heat source inlet, the salt melting furnace is communicated with the molten salt inlet of the heat exchanger through a molten salt pipeline, the salt melting furnace is communicated with the molten salt storage tank through a delivery pump, the molten salt outlet of the heat exchanger is communicated with the salt melting furnace through a first pipeline, the heat source outlet and the heat source inlet of the heat exchanger are connected with a heat conduction oil solar heat collection field, and the heat conduction oil solar heat collection field is used for providing a heat exchange heat source for the heat exchanger.
Further: the auxiliary electric heater is characterized by further comprising an auxiliary electric heater, an inlet of the auxiliary electric heater is communicated with the molten salt pipeline, and an outlet of the auxiliary electric heater is communicated with the salt melting furnace through a second pipeline.
Further: and the first pipeline and the second pipeline are respectively provided with a valve and a temperature measuring instrument.
Further: the electric energy used in the auxiliary electric heater is derived from abandoned wind power, abandoned light power or off-peak power.
Further: the number of the heat exchangers is multiple, and the heat exchangers are installed in a parallel mode.
Further: the number of the heat exchangers is multiple, and the heat exchangers are installed in series.
Further: two adjacent heat exchangers are communicated through a secondary molten salt pipeline.
Further: and the secondary molten salt pipeline is provided with a valve and a temperature measuring instrument.
Further: the heat exchanger is a shell-and-tube heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.
The invention has the following beneficial effects:
1. the salt melting system solves the problems that the conventional photo-thermal power station solid-state molten salt is melted by a natural gasified salt furnace system, the conventional natural gasified salt furnace realizes the salt melting process and is limited by factors such as furnace heating capacity and natural gas consumption, the whole salt melting period cannot be guaranteed, and the salt melting cost is high.
2. The salt melting work is carried out by utilizing the photo-thermal power generation system, so that both power generation and salt melting are realized, and the salt melting capacity is far greater than that of a salt melting furnace system;
3. the solar salt melting device can be used for melting salt by using light and heat when the sun is available in the daytime, and can be used for melting salt by absorbing abandoned electricity or off-peak electricity through electric heating when the sun is unavailable at night, so that the salt melting period is effectively shortened.
4. Compared with the conventional salt dissolving mode, the salt dissolving is realized in a photo-thermal mode, the salt dissolving speed is obviously improved, and the system is simple in structure, simple and convenient to operate, high in safety, energy-saving and environment-friendly.
5. Compared with the conventional salt dissolving mode, the conventional salt dissolving mode is influenced by equipment environment, equipment and factory environment, the cleanness of salt is low, and salt dissolving is carried out in a photo-thermal heat exchange mode, so that the salt dissolving mode is clean and efficient.
6. According to the salt melting scheme, sodium nitrate and potassium nitrate are crushed and then are conveyed into a salt melting furnace in proportion, after salt initialization is carried out by an electric heater, low-temperature liquid molten salt in the salt melting furnace is pumped into an oil salt heat exchanger by using a molten salt circulating pump, the low-temperature molten salt in the oil salt heat exchanger is heated to a high-temperature state by high-temperature heat conduction oil absorbing solar energy through a solar heat collection field and then is conveyed back to the salt melting furnace, and the high-temperature liquid salt and normal-temperature solid molten salt are mixed to form low-temperature liquid molten salt of more than 270 ℃ and are conveyed and stored into a molten salt storage tank.
The salt melting speed of the photothermal salt melting system exceeds 210t/h, which is 5-7 times of the traditional salt melting speed, and the photothermal salt melting system takes solar energy as a source of heat required by salt melting, does not need any fossil fuel, and is clean and environment-friendly. Because the original heat exchange equipment of the light and heat power station is utilized, the construction cost is saved. After salt melting is finished, the matched feeding system can be detached and recycled, and the salt melting furnace and the electric heater can be directly converted into a high-temperature energy storage system for absorbing waste wind and light and realizing energy storage.
7. By adopting the salt melting system, the salt melting speed exceeds 210 tons/hour, is five times faster than the traditional salt melting speed, can exceed 4000 tons every day, is more than four times of the previous single-day salt melting world record, only needs two and a half weeks if 7 ten thousand tons of salt are continuously melted, is two months faster than the traditional salt melting mode, realizes the power generation of an energy storage system in advance, saves ten thousand yuan fossil fuel of the salt, and saves 20% of equipment investment compared with the traditional salt melting system.
Drawings
FIG. 1 is a schematic diagram of a salt melting system based on a heat-conducting oil solar heat collection field;
FIG. 2 is a schematic diagram of a salt neutralization system according to a second embodiment;
FIG. 3 is a schematic diagram of a salt dissolving system of a heat exchanger according to a second embodiment;
FIG. 4 is a schematic diagram showing the relationship between salt dissolving amount and salt dissolving period between the conventional salt dissolving mode and the salt dissolving mode of the present invention;
in the figure, 1-a salt melting furnace, 2-a heat exchanger, 3-a molten salt storage tank, 4-a molten salt pipeline, 5-a delivery pump, 6-a heat-conducting oil solar heat collection field, 7-a secondary molten salt pipeline, 8-a valve, 9-a temperature measuring instrument, 10-an auxiliary electric heater, 11-a first pipeline, 12-a second pipeline, 14-a circulating pump, 21-a molten salt inlet, 22-a molten salt outlet, 23-a heat source outlet and 24-a heat source inlet.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows:
referring to fig. 1, the solar thermal power station salt melting system based on a heat conduction oil heat collection field comprises a salt melting furnace 1, a heat exchanger 2 and a molten salt storage tank 3, wherein the heat exchanger 2 is provided with a molten salt inlet 21, a molten salt outlet 22, a heat source outlet 23 and a heat source inlet 24, the salt melting furnace 1 is communicated with the molten salt inlet 21 of the heat exchanger 2 through a molten salt pipeline 4, the salt melting furnace 1 is communicated with the molten salt storage tank 3 through a delivery pump 5, the molten salt outlet 22 of the heat exchanger 2 is communicated with the salt melting furnace 1 through a first pipeline 11, the heat source outlet 23 and the heat source inlet 24 of the heat exchanger 2 are connected with the heat conduction oil solar heat collection field 6, and the heat conduction oil solar heat collection field 6 is used for providing a heat exchange heat source for the heat exchanger 2.
In the salt melting furnace 1, solid salt and high-temperature molten salt are mixed in the salt melting furnace 1 to form intermediate-temperature liquid molten salt, one part of the intermediate-temperature liquid molten salt is sent into a molten salt storage tank 3 through a delivery pump 5 to be stored, the other part of the intermediate-temperature liquid molten salt is sent into a heat exchanger 2 through a circulating pump, the intermediate-temperature molten salt is heated to the high-temperature molten salt through the heat exchanger 2, then the high-temperature molten salt is sent into the salt melting furnace 1 through the circulating pump to be used for salt melting again, and therefore circulating salt melting work is formed;
in the embodiment, the heat exchanger 2 is a heat conduction oil heat exchanger, when the system works for melting salt, solid salt and 300-plus-400-DEG high-temperature molten salt are mixed in the salt melting furnace 1 to form 280-plus-340-DEG medium-temperature liquid molten salt, one path of the formed medium-temperature liquid molten salt is sent to the molten salt storage tank 3 for storage through the transfer pump 5, the other portion of the formed medium-temperature liquid molten salt is sent into the heat exchanger 2 through the circulating pump from the molten salt inlet 21, meanwhile, the heat conduction oil solar heat collection field 6 is communicated with the heat source outlet 23 and the heat source inlet 24 of the heat exchanger 2, the high-temperature heat conduction oil which absorbs heat in the heat conduction oil solar heat collection field 6 is sent to the heat exchanger 2, the heat is transferred to the medium-temperature molten salt entering the heat exchanger 2 through the high-temperature heat conduction oil in the heat exchanger 2, so that the temperature of the medium-temperature molten salt (280-plus-340 ℃) reaches the high-temperature molten salt (300-plus-400 ℃), and then, conveying the high-temperature molten salt into the salt melting furnace 1 through the first pipeline 11 for completing salt melting again, wherein the conveying amount ensures that the solid molten salt newly added into the salt melting furnace 1 can reach a certain temperature, melting the solid molten salt, and repeating the steps to realize circulating salt melting.
The salt melting system in the embodiment solves the problem that the conventional photo-thermal power station solid-state molten salt is melted through the natural gasified salt furnace system, the conventional natural gasified salt furnace realizes the salt melting process and is limited by factors such as furnace heating capacity and natural gas consumption, the whole salt melting period is long, and the construction and operation costs of the salt melting cost are high.
By adopting the salt melting system, the salt melting work is carried out by utilizing the power generation and heat storage system of the optical-thermal power station, so that the power generation and the salt melting are both correct, and the salt melting capacity is far greater than that of the traditional natural gasification salt furnace system;
inside the heat exchanger 2, high-temperature heat conducting oil is used for exchanging heat to the medium-temperature molten salt entering the heat exchanger 2, so that the temperature of the medium-temperature molten salt reaches the high-temperature molten salt. The heat conduction oil is derived from a heat conduction oil solar heat collection field 6, and the heat conduction oil in the heat exchanger 2 is heated by adopting a solar mirror field mode. The heat conducting oil in the heat exchanger 2 is derived from a solar mirror field, the groove type solar heat collector is specifically used, the heat conducting oil in the heating pipeline is converted into heat energy by utilizing solar energy, salt melting work is carried out by utilizing the converted heat energy, the usage amount of natural gas of a molten salt project of a large photo-thermal power station is reduced, and the salt melting cost is reduced. Meanwhile, solar energy is fully utilized, and environmental benefits are improved.
In the present embodiment, the salt melting furnace 1 is used for converting the pulverized solid molten salt into a liquid state melt, and the salt melting furnace 1 is a container for realizing salt melting; the heat exchanger 2 is a shell-and-tube heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.
The second embodiment is as follows:
referring to fig. 1 and 2, on the basis of the first embodiment, the salt melting furnace further comprises an auxiliary electric heater 10, an inlet of the auxiliary electric heater 10 is communicated with the molten salt pipeline 4, and an outlet of the auxiliary electric heater 10 is communicated with the salt melting furnace 1 through a second pipeline 12;
specifically, the method comprises the following steps: a part of the medium-temperature molten salt in the salt melting furnace 1 flows into the heat exchanger 2 and/or the auxiliary electric heater 10, the medium-temperature molten salt is heated to high-temperature molten salt by the heat exchanger 2 and/or the auxiliary electric heater 10, and then the high-temperature molten salt is conveyed into the salt melting furnace 1 through the circulating pump, so that the circulating salt melting work is realized;
when the system works for melting salt, solid salt and 300-400 ℃ high-temperature molten salt are mixed in a melting salt furnace 1 to form 280-340 ℃ medium-temperature liquid molten salt, one path of the formed medium-temperature liquid molten salt is sent to a molten salt storage tank 3 through a delivery pump 5 for storage, the other portion of the formed medium-temperature liquid molten salt is pumped into a heat exchanger 2 or an auxiliary electric heater 10 through a circulating pump 14, the medium-temperature liquid molten salt (280-340 ℃) is heated and converted into the high-temperature liquid molten salt (300-400 ℃) through the heat exchanger 2 or the auxiliary electric heater 10, then the high-temperature molten salt is delivered into the melting salt furnace 1 to realize cyclic salt, and the delivery amount ensures that the solid molten salt newly added into the melting salt furnace 1 can reach a certain temperature and melt the solid molten salt.
The number of the auxiliary electric heaters 10 is multiple, and the multiple auxiliary electric heaters 10 are arranged in the whole salt dissolving system in a parallel or series mode;
in this embodiment, the salt melting system of this embodiment is adopted, the salt melting speed exceeds 210 tons/hour, which is five times faster than the conventional salt melting speed, and can exceed 4000 tons per day, which is four times or more of the previous single-day salt melting world record, if 7 ten thousand tons of salt are melted continuously, only two weeks and half are needed, which is two months faster than the conventional salt melting method, the heat storage island power generation can be realized in advance, ten thousand yuan fossil fuel for saving salt can be saved, the equipment investment can be saved by 20% as compared with the conventional salt melting system, and specifically, for example, as shown in table 1:
TABLE 1 comparison of photothermolysis of salt System with classical salt System
It should be noted that, in a solar power generation project, a natural gasified salt furnace is adopted in a conventional salt system in the world at present, and flue gas generated after combustion of natural gas is used for providing heat to melt solid molten salt into liquid.
When salt melting is needed in a certain solar power generation project, a natural gasified salt furnace is purchased in a conventional mode, and then heat is provided by using flue gas generated after combustion of natural gas, so that solid molten salt is melted into liquid;
different from the conventional salt dissolving mode, in the present embodiment, the salt dissolving operation is performed by using the original equipment of the solar power plant, for example, the heat exchanger 2 and the heat conduction oil solar heat collection field 6 used in the present embodiment are the existing equipment of the power plant, and the original function of the equipment is used for solar power generation, in the present embodiment, the salt dissolving system is formed according to the matching and connecting mode of the technical features in the present embodiment, and is used for salt dissolving, so that the cost of purchasing and building a natural gasified salt furnace is saved, the carbon dioxide emission in the salt dissolving process is reduced, and the salt dissolving speed and the salt dissolving period are improved by using the existing equipment to realize salt dissolving (as shown in fig. 4);
it should be noted that: the heat storage medium used in the photo-thermal power station project is high-temperature molten salt, taking a 100 MW-level groove type heat conduction oil photo-thermal power generation project in Wulat as an example, the power station is provided with a high-temperature molten salt heat storage system, and the high-temperature molten salt used by the system is a mixture of potassium nitrate with the mass fraction of 40% and sodium nitrate with the mass fraction of 60%. Before the molten salt energy storage system is put into operation, solid molten salt is melted and injected into the cold salt tank, and the step (salt melting) plays a crucial role in smooth debugging and formal operation of the heat storage system. At present, the international conventional salt melting system adopts a natural gasified salt furnace, and uses the smoke generated after the combustion of natural gas to provide heat so as to melt solid molten salt into liquid. The conventional salt dissolving system not only has low salt dissolving rate and cannot normally put the heat storage system into operation in a short time, but also needs to consume a large amount of fossil fuel, which is contrary to the promise of 'double carbon'. But is limited by the characteristics of high melting temperature of molten salt, more technical difficulties of salt melting systems and the like, and the practical exploration of high-speed and low-carbon novel salt melting technology at home and abroad is almost zero.
The salt melting system of the embodiment can ensure that both photo-thermal power generation and salt melting are not wrong, and has very important significance for realizing salt melting in photo-thermal power generation projects.
The third concrete implementation mode:
referring to fig. 1 and 2, on the basis of the first embodiment and the second embodiment, a valve 8 and a temperature measuring instrument 9 are respectively installed on the first pipeline 11 and the second pipeline 12, the valve 8 is used for controlling the opening and closing of the pipelines, and the temperature measuring instrument 8 is used for measuring the temperature of fluid in the pipelines. The opening and closing of the molten salt in the first pipeline 11 and the second pipeline 12 are monitored in real time by utilizing the information interaction of the valve 8 and the temperature measuring instrument 9, so that the smooth proceeding of the molten salt work is ensured.
The fourth concrete implementation mode:
on the basis of the second embodiment, the electric energy used by the auxiliary electric heater 10 is derived from low-cost electricity such as abandoned wind electricity, abandoned light electricity, and off-peak electricity, and the cost of the electric energy is lower than that of the electric energy provided by a conventional power station.
The fifth concrete implementation mode:
referring to fig. 3, the present embodiment provides a salt melting system for a solar thermal power station based on a heat-conducting oil heat collection field, which is different from the first embodiment in that the number of heat exchangers 2 is multiple, and the multiple heat exchangers 2 are installed in parallel. The heat exchangers 2 arranged in parallel can heat the medium-temperature liquid molten salt with the temperature of 280 plus 340 ℃ simultaneously so as to achieve the high-temperature molten salt with the temperature of 300 plus 400 ℃, in addition, the work/close of any one heat exchanger 2 can be independently controlled, and the work of other heat exchangers 2 is not influenced, in the whole system, the mode of connecting the heat exchangers 2 in parallel has the advantages of flexibility, convenient use and no influence on the operation of the whole salt melting system when an accident occurs to a single heat exchanger 2.
The sixth specific implementation mode:
referring to fig. 3, the present embodiment provides a salt melting system for a solar thermal power station based on a heat-conducting oil heat collection field, and is different from the first embodiment in that the number of the heat exchangers 2 is multiple, and the plurality of heat exchangers 2 are installed in series. The intermediate-temperature liquid molten salt with the temperature of 280 plus 340 ℃ can flow through a passage to exchange heat for many times by adopting the heat exchangers 2 in series so as to achieve the high-temperature molten salt with the temperature of 300 plus 400 ℃, and the whole system only has one passage by adopting the series connection mode, thereby being convenient for controlling the whole system by a switch.
The seventh embodiment:
referring to fig. 3, on the basis of the fifth embodiment, two adjacent heat exchangers 2 are communicated through a secondary molten salt pipeline 7. And a valve 8 for opening/closing the secondary molten salt pipeline 7 and a temperature measuring instrument 8 for measuring the temperature of the liquid molten salt flowing through the secondary molten salt pipeline 7 are installed on the secondary molten salt pipeline 7. According to the arrangement, the 280-DEG C340-DEG C intermediate temperature liquid molten salt flowing out of the molten salt furnace 1 enters the heat exchanger 2, and the 280-DEG C340-DEG C intermediate temperature liquid molten salt is increased to 300-DEG C400-DEG C high temperature molten salt in the heat exchanger 2; if the medium temperature liquid molten salt in the heat exchanger 2 can not effectively exchange heat to the high temperature molten salt temperature value state, the secondary molten salt pipeline 7 is opened, the liquid molten salt is conveyed into the other heat exchanger 2 connected in parallel again, and heat exchange is further carried out on the liquid molten salt until the high temperature molten salt state of 300-400 ℃ is achieved.
The specific implementation method nine:
referring to fig. 1 and 3, on the basis of the fifth embodiment, the heat exchanger 2 is used for heating and converting the intermediate-temperature liquid molten salt (280-.
In the present embodiment, the temperature of the high-temperature molten salt can be varied up and down to 370 degrees, the range of 70 degrees (not more than 600 degrees at the maximum), the temperature of the medium-temperature salt can be varied up and down to 310 degrees, and the range of 30 degrees.
The detailed implementation mode is ten:
with reference to the first embodiment, the heat exchanger 2 is a shell-and-tube heat exchanger, or a plate heat exchanger.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (9)
1. The utility model provides a solar energy light and heat power station salt melting system based on conduction oil thermal-arrest field which characterized in that: the heat exchanger (2) is provided with a molten salt inlet (21), a molten salt outlet (22), a heat source outlet (23) and a heat source inlet (24), the molten salt inlet (21) of the heat exchanger (2) is communicated with the molten salt outlet (1) of the heat exchanger (2) through a molten salt pipeline (4), the molten salt furnace (1) is communicated with the molten salt storage tank (3) through a delivery pump (5), the molten salt outlet (22) of the heat exchanger (2) is communicated with the molten salt furnace (1) through a first pipeline (11), the heat source outlet (23) and the heat source inlet (24) of the heat exchanger (2) are connected with a heat conduction oil solar heat collection field (6), and the heat conduction oil solar heat collection field (6) is used for providing a heat exchange heat source for the heat exchanger (2).
2. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 1, characterized in that: the salt melting furnace is characterized by further comprising an auxiliary electric heater (10), wherein the inlet of the auxiliary electric heater (10) is communicated with the molten salt pipeline (4), and the outlet of the auxiliary electric heater (10) is communicated with the salt melting furnace (1) through a second pipeline (12).
3. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 2, characterized in that: and the first pipeline (11) and the second pipeline (12) are respectively provided with a valve (8) and a temperature measuring instrument (9).
4. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 3, characterized in that: the electric energy used in the auxiliary electric heater (10) is derived from abandoned wind power, abandoned light power or off-peak power.
5. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 1, characterized in that: the number of the heat exchangers (2) is multiple, and the heat exchangers (2) are installed in a parallel mode.
6. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 1, characterized in that: the number of the heat exchangers (2) is multiple, and the heat exchangers (2) are installed in series.
7. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 5, characterized in that: two adjacent heat exchangers (2) are communicated through a secondary molten salt pipeline (7).
8. The salt melting system of the solar photo-thermal power station based on the heat conduction oil heat collection field according to claim 7, characterized in that: and a valve (8) and a temperature measuring instrument (9) are arranged on the secondary molten salt pipeline (7).
9. The salt melting system of the solar photo-thermal power station based on the heat collecting field of the heat conducting oil according to any one of claims 1 to 2 and 5 to 7, wherein the salt melting system comprises: the heat exchanger (2) is a shell-and-tube heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110696805.4A CN113318675A (en) | 2021-06-23 | 2021-06-23 | Salt melting system of solar thermal power station based on heat conduction oil heat collection field |
| ES202390247A ES2960606R1 (en) | 2021-06-23 | 2021-07-23 | Solar thermal power plant salt fusion system based on thermal oil collector field |
| PCT/CN2021/108092 WO2022267155A1 (en) | 2021-06-23 | 2021-07-23 | Solar photo-thermal power station salt melting system based on heat transfer oil heat collection field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110696805.4A CN113318675A (en) | 2021-06-23 | 2021-06-23 | Salt melting system of solar thermal power station based on heat conduction oil heat collection field |
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| CN113318675A true CN113318675A (en) | 2021-08-31 |
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| CN202110696805.4A Pending CN113318675A (en) | 2021-06-23 | 2021-06-23 | Salt melting system of solar thermal power station based on heat conduction oil heat collection field |
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| CN (1) | CN113318675A (en) |
| ES (1) | ES2960606R1 (en) |
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Cited By (1)
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| CN114522625A (en) * | 2022-04-12 | 2022-05-24 | 中国船舶重工集团新能源有限责任公司 | In-pipe heat source type salt melting and energy storage system |
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Also Published As
| Publication number | Publication date |
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| WO2022267155A1 (en) | 2022-12-29 |
| ES2960606R1 (en) | 2024-04-18 |
| ES2960606A2 (en) | 2024-03-05 |
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