CN108534222B - Molten salt energy storage and heat supply system with molten salt static mixer - Google Patents
Molten salt energy storage and heat supply system with molten salt static mixer Download PDFInfo
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- CN108534222B CN108534222B CN201810566791.2A CN201810566791A CN108534222B CN 108534222 B CN108534222 B CN 108534222B CN 201810566791 A CN201810566791 A CN 201810566791A CN 108534222 B CN108534222 B CN 108534222B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 211
- 230000003068 static effect Effects 0.000 title claims abstract description 42
- 238000004146 energy storage Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005338 heat storage Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 235000015598 salt intake Nutrition 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/02—Other domestic- or space-heating systems consisting of self-contained heating units, e.g. storage heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to a molten salt energy storage and heat supply system with a molten salt static mixer, which comprises a low-temperature molten salt tank, a low-temperature molten salt pump, a molten salt electric heater, a high-temperature molten salt tank, a high-temperature molten salt pump, a mixed salt molten salt pump, a static mixer, a water supply pump, a deaerator, a circulating water pump, a preheater, an evaporator and a heat user, wherein the low-temperature molten salt tank is connected with the low-temperature molten salt pump; the high-temperature molten salt tank is connected with one inlet of the static mixer through a high-temperature molten salt pump and a corresponding molten salt pipeline, the low-temperature molten salt tank is connected with the other inlet of the static mixer through a salt mixing molten salt pump and a corresponding molten salt pipeline, and one outlet of the low-temperature molten salt tank is heated by the low-temperature molten salt pump through the molten salt electric heater and then enters the high-temperature molten salt tank; and the outlet of the static mixer is connected with the molten salt inlet of the evaporator. The heat supply system can reduce the temperature difference between two ends of the heat exchanger by about 100 ℃ by additionally arranging a set of molten salt static mixer, and remarkably reduces the manufacturing difficulty and the manufacturing cost of the heat exchanger, so that the heat supply system is suitable for a large-temperature-difference heat exchange process in a molten salt energy storage system.
Description
Technical Field
The invention relates to the technical field of molten salt energy storage and heat supply, in particular to a molten salt energy storage and heat supply system with a molten salt static mixer.
Background
Along with the development of social economy, the demand for heat supply is continuously increased, the consumption of coal is increased, a series of environmental problems caused by coal are faced, the energy storage technology is more and more concerned by the heat industry, and the energy storage technology of 'coal to electricity' is in accordance with the policy requirement. Binary molten Salt is used as an energy storage medium for photo-thermal power generation and is already mature to be applied to energy storage systems of foreign photo-thermal power stations. The fused salt has the characteristics of large temperature difference, high heat capacity, environmental friendliness, no pollution and the like, and is an excellent medium-high temperature heat storage material.
Because the melting point of the molten Salt is higher, such as 220 ℃ as the melting point of binary molten Salt Solar Salt, in order to furthest utilize the energy storage temperature region of the molten Salt, the working temperature of the high-temperature molten Salt is higher (more than 400 ℃), and in a molten Salt energy storage and heat supply system, the temperature parameter required by a heat user is often high-temperature hot water or steam with the temperature of 180-200 ℃, so that the temperature difference between two ends of a molten Salt/water (steam) heat exchanger is overlarge, and the maximum temperature difference is about 200 ℃, but in actual engineering, the medium temperature difference between two sides of the heat exchanger is overlarge, the larger the temperature stress born by the heat exchanger is, the more difficult the heat exchanger is manufactured, and the higher the manufacturing cost is, so that the popularization and the use of the energy storage and heat supply system are not facilitated.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a molten salt energy storage and heat supply system with a molten salt static mixer, which aims at solving the problems of large heat exchange temperature difference, difficult heat exchange and large heat exchanger manufacturing difficulty of a heat exchanger in a high-temperature molten salt energy storage and heat supply system, improves the existing system, can reduce the temperature difference between two ends of the heat exchanger by about 100 ℃ by adding a set of molten salt static mixer, obviously reduces the manufacturing difficulty and manufacturing cost of the heat exchanger, and is suitable for a large-temperature difference heat exchange process in the molten salt energy storage system.
The technical scheme of the invention is as follows: the molten salt energy storage and heat supply system with the molten salt static mixer is characterized by comprising a low-temperature molten salt tank, a low-temperature molten salt pump, a molten salt electric heater, a high-temperature molten salt tank, a high-temperature molten salt pump, a mixed salt molten salt pump, a static mixer, a water supply pump, a deaerator, a circulating water pump, a preheater, an evaporator and a heat user;
the high-temperature molten salt tank is connected with one inlet of the static mixer through a high-temperature molten salt pump and a corresponding molten salt pipeline, the low-temperature molten salt tank is connected with the other inlet of the static mixer through a salt mixing molten salt pump and a corresponding molten salt pipeline, and one outlet of the low-temperature molten salt tank is heated by the low-temperature molten salt pump through the molten salt electric heater and then enters the high-temperature molten salt tank; the outlet of the static mixer is connected with the molten salt inlet of the evaporator, the molten salt outlet of the evaporator is connected with the low-temperature molten salt tank, the hot working medium outlet of the evaporator is led out of three branches, the first branch is directly connected with a heat user, whether condensate water is recovered or not is judged according to the heat utilization mode of the heat user, and if the condensate water is recovered, the condensate water is pumped into the deaerator by the water supply pump;
the second branch is connected with an inlet at one side of the preheater, an outlet at one side of the preheater is connected with a deaerator, and an outlet of the deaerator is connected with an inlet at the other side of the preheater through a circulating water pump;
the third branch is directly connected with the deaerator;
and the outlet of the other side of the preheater is connected with the hot working medium inlet of the evaporator.
The beneficial effects of the invention are as follows:
according to the fused salt energy storage and heat supply system with the static mixer, the static mixer is applied to the field of energy supply and heat storage to reduce the temperature of a heat storage medium, high-temperature fused salt and low-temperature fused salt are firstly mixed under the action of the static mixer to obtain medium-temperature fused salt with the temperature lower than that of the high-temperature fused salt, and then the medium-temperature fused salt exchanges heat with the evaporator, so that the heat exchange temperature difference at two ends of the evaporator is remarkably reduced. The whole system has the advantages of simple structure, convenient operation, simple control and low cost, is very suitable for industrial popularization and application, and has great economic benefit.
Drawings
FIG. 1 is a schematic diagram of a molten salt energy storage and heating system with a molten salt static mixer of the present invention;
in the figure, a low-temperature molten salt tank 1, a low-temperature molten salt pump 2, a molten salt electric heater 3, a high-temperature molten salt tank 4, a high-temperature molten salt pump 5, a salt mixing molten salt pump 6, a static mixer 7, a water supply pump 8, a deaerator 9, a circulating water pump 10, a preheater 11, an evaporator 12 and a heat user 13.
Detailed Description
The present invention is further explained below with reference to examples and drawings, but is not to be construed as limiting the scope of the present application.
The invention relates to a molten salt energy storage and heat supply system with a molten salt static mixer (a system or a heat supply system for short, see figure 1), which comprises a low-temperature molten salt tank 1, a low-temperature molten salt pump 2, a molten salt electric heater 3, a high-temperature molten salt tank 4, a high-temperature molten salt pump 5, a mixed salt molten salt pump 6, a static mixer 7, a water supply pump 8, a deaerator 9, a circulating water pump 10, a preheater 11, an evaporator 12 and a heat user 13;
the high-temperature molten salt tank 4 is connected with one inlet of the static mixer 7 through a high-temperature molten salt pump 5 and a corresponding molten salt pipeline, the low-temperature molten salt tank 1 is connected with the other inlet of the static mixer through a salt mixing molten salt pump 6 and a corresponding molten salt pipeline, and one outlet of the low-temperature molten salt tank is heated by the low-temperature molten salt pump 2 through the molten salt electric heater 3 and then enters the high-temperature molten salt tank 4; the outlet of the static mixer 7 is connected with the molten salt inlet of the evaporator 12, the molten salt outlet of the evaporator 12 is connected with the low-temperature molten salt tank 1, the hot working medium outlet of the evaporator is led out of three branches, the first branch is directly connected with the heat user 13, whether condensate water is recovered or not is judged according to the heat utilization mode of the heat user, if the condensate water is recovered, the condensate water is pumped into the deaerator 9 by the water supply pump 8 for the next cycle;
the second branch is connected with an inlet at one side of the preheater 11, an outlet at one side of the preheater 11 is connected with the deaerator 9, and an outlet of the deaerator 9 is connected with an inlet at the other side of the preheater 11 through the circulating water pump 10; the hot working medium from the evaporator is used as a heat source to heat the condensed water from the deaerator 9 to 180 ℃, and the steam returns to the deaerator 9 after being cooled;
the third branch is directly connected with the deaerator 9, the hot working medium coming out of the evaporator is used as a heat source to remove oxygen in the feed water (condensed water) pumped by the feed water pump, and the feed water (condensed water) in the deaerator 9 is heated to 104 ℃;
and the outlet of the other side of the preheater is connected with the hot working medium inlet of the evaporator.
The heat source of the secondary heating network can be used as a heat source of the secondary heating network, and the temperature of the heat source can be adjusted according to the requirements of users.
The working process of the molten salt energy storage and heat supply system with the molten salt static mixer is as follows:
in the night off-peak electricity period, low-temperature molten salt (the working temperature of the low-temperature molten salt is set to 190 ℃) which is arranged in a low-temperature molten salt tank 1 is pumped into a molten salt electric heater 3 through a low-temperature molten salt pump 2 to be heated into high-temperature molten salt (the working temperature of the high-temperature molten salt is set to 405 ℃) and stored in a high-temperature molten salt tank 4, so that a molten salt heat storage process is completed;
when the terminal heat user 13 needs heat, the high-temperature molten salt pump 5 and the mixed salt molten salt pump 6 respectively pump the high-temperature molten salt and the low-temperature molten salt into the static mixer 7 at the same time for mixing, the temperature of the mixed molten salt is between the working temperatures of the high-temperature molten salt and the low-temperature molten salt (300 ℃), and after passing through the evaporator 12, the temperature of the molten salt is reduced to 190 ℃ and then returns to the low-temperature molten salt tank 1.
The hot user of this example only takes saturated steam at 185 c as an example. The hot-side system water is fed through a deaerator 9, a circulating water pump 10 and a preheater 11 by a water feeding pump 8, then enters an evaporator 12, exchanges heat with 300 ℃ mixed molten salt from a static mixer 7, generates 185 ℃ saturated steam after heat exchange (185 ℃ saturated steam is discharged from the evaporator 12, the whole flow is that 104 ℃ water is fed into the preheater 11 by the circulating water pump 10, is heated to 180 ℃ at the preheater 11, then 180 ℃ saturated water enters the evaporator 12, is heated to 185 ℃ saturated steam by the evaporator 12), is separated by the evaporator 12, the hot steam flows out in three branches, the first branch steam is directly sent to a hot user, the hot user can judge whether condensate water is recovered according to the heat utilization mode of the hot user, if the condensate water is recovered, the condensate water is pumped into the system by the water feeding pump 8 for next circulation; the steam of the second branch enters a preheater 11 as a heat source to heat condensed water from the deaerator 9 to 180 ℃, and the steam returns to the deaerator 9 after being cooled; the third branch steam directly enters the deaerator 9, and serves as a heat source to remove oxygen in the feed water (condensed water) and heat the feed water (condensed water) in the deaerator 9 to 104 ℃. The deaerator is added for deaerating and heating the water supplied by the system and the steam condensate water of the preheater 11, because the oxygen in the water is more likely to corrode equipment; the temperature of the outlet of the deaerator is 104 ℃ generally limited by the running pressure of the deaerator, in order to prevent the molten salt from being frozen and blocked in the evaporator due to the fact that the temperature of the feed water entering the evaporator 12 is too low, the feed water of the system from the deaerator needs to be pumped into the preheater 11 through the circulating water pump 10 to be heated to 180 ℃ again and enter the evaporator for heat exchange, the purpose of adding the preheater is mainly to heat the feed water of the system, the temperature of the feed water is improved, because the molten salt has a solidifying point, if the temperature of the feed water is too low, the molten salt is easily solidified in the evaporator, the system is frozen and blocked, the temperature of the feed water is required to be improved, the temperature of the feed water is above the solidifying point of the molten salt, the molten salt is ensured not to be solidified, and the safe running of the system is ensured.
The molten salt energy storage and heat supply system with the molten salt static mixer can effectively improve the service temperature of the molten salt, and on the basis of the same heat storage quantity Q, for example, in an energy storage and heat supply system without the static mixer, the temperature of the energy storage high-temperature molten salt is 300 ℃, the temperature of the low-temperature molten salt after heat exchange is 190 ℃, the energy storage temperature difference is 110 ℃, and the energy storage temperature difference is according to a heat balance formula
Q＝cmΔt
And under the condition of not considering molten salt allowance and heat exchange efficiency, calculating the consumption of the energy storage molten salt to be Q/(c 110). After the static mixer is added, the use temperature of the energy storage high-temperature molten salt can reach 405 ℃, the temperature of the low-temperature molten salt after heat exchange is 190 ℃, the energy storage temperature difference is 215 ℃, the energy storage molten salt consumption is calculated according to a heat balance formula and is Q/(c is 215), and the consumption is only 51.2% of the consumption of the molten salt without the static mixer. Therefore, the molten salt energy storage and heat supply system additionally provided with the static mixer obviously reduces the use amount of molten salt, reduces the volume of an energy storage device, saves the occupied area of the system, correspondingly reduces the flow of the molten salt pump and obviously reduces the power consumption of the pump.
The energy storage molten salt adopted in the process is low-melting-point molten salt, the melting point is 115 ℃, the temperature of the low-temperature molten salt after heat exchange of the evaporator is set to 190 ℃ in order to ensure that the low-melting-point molten salt is not solidified in the heat exchange process, the upper limit use temperature of the low-melting-point energy storage molten salt is higher than 405 ℃, but the temperature of the heat storage high-temperature molten salt is 405 ℃ in order to reduce the material cost of manufacturing a storage tank.
The use temperature of the energy storage high-temperature molten salt can be further improved, the requirement on the material of the high-temperature molten salt tank is more strict when the temperature is further improved, the upper limit of the use temperature of the high-temperature molten salt tank made of carbon steel is 405 ℃, if the use temperature is focused on reducing the use amount of the high-temperature molten salt or increasing the energy storage capacity of the high-temperature molten salt, the high-temperature molten salt tank made of other high-temperature resistant materials can be selected, the use amount of the molten salt is less, and the equipment volume is smaller.
The fused salt energy storage and heat supply system with the fused salt static mixer can realize the process of high-temperature energy storage and low-temperature salt mixing heat exchange by only adding one salt mixing pump and corresponding fused salt pipelines and valves on the system structure, has the advantages of simple structure, convenient operation, simple control and low cost, and is very suitable for industrial popularization and application.
The invention is applicable to the prior art where it is not described.
Claims (2)
1. The molten salt energy storage and heat supply system with the molten salt static mixer is characterized by comprising a low-temperature molten salt tank, a low-temperature molten salt pump, a molten salt electric heater, a high-temperature molten salt tank, a high-temperature molten salt pump, a mixed salt molten salt pump, a static mixer, a water supply pump, a deaerator, a circulating water pump, a preheater, an evaporator and a heat user;
the high-temperature molten salt tank is connected with one inlet of the static mixer through a high-temperature molten salt pump and a corresponding molten salt pipeline, the low-temperature molten salt tank is connected with the other inlet of the static mixer through a salt mixing molten salt pump and a corresponding molten salt pipeline, and one outlet of the low-temperature molten salt tank is heated by the low-temperature molten salt pump through the molten salt electric heater and then enters the high-temperature molten salt tank; the outlet of the static mixer is connected with the molten salt inlet of the evaporator, the molten salt outlet of the evaporator is connected with the low-temperature molten salt tank, the hot working medium outlet of the evaporator is led out of three branches, the first branch is directly connected with a heat user, whether condensate water is recovered or not is judged according to the heat utilization mode of the heat user, and if the condensate water is recovered, the condensate water is pumped into the deaerator by the water supply pump;
the second branch is connected with an inlet at one side of the preheater, an outlet at one side of the preheater is connected with a deaerator, and an outlet of the deaerator is connected with an inlet at the other side of the preheater through a circulating water pump;
the third branch is directly connected with the deaerator;
the outlet of the other side of the preheater is connected with the hot working medium inlet of the evaporator;
the working process of the heating system is as follows:
in the night off-peak electricity period, the low-temperature molten salt placed in the low-temperature molten salt tank is pumped into a molten salt electric heater through a low-temperature molten salt pump to be heated into high-temperature molten salt, and the high-temperature molten salt is stored in the high-temperature molten salt tank to finish the molten salt heat storage process;
when the heat is needed by the terminal heat user, the high-temperature molten salt pump and the mixed salt molten salt pump respectively pump the high-temperature molten salt and the low-temperature molten salt into the static mixer at the same time for mixing, the temperature of the mixed molten salt is between the working temperatures of the high-temperature molten salt and the low-temperature molten salt, and after passing through the evaporator, the temperature of the molten salt is reduced to the initial temperature of the low-temperature molten salt and then returns to the low-temperature molten salt tank.
2. The molten salt energy storage and heating system with molten salt static mixer of claim 1, wherein the molten salt energy storage and heating system comprises a molten salt mixer; the heat user is the heat source of the industrial steam user or the secondary heating network.
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| CN109539215A (en) * | 2018-11-16 | 2019-03-29 | 深圳市爱能森储能技术创新有限公司 | A kind of energy storage device and peak regulating method for peak regulation of power plant |
| CN114484903A (en) * | 2021-12-28 | 2022-05-13 | 青海中控太阳能发电有限公司 | Photovoltaic photo-thermal sharing energy storage device and use method thereof |
| CN116202353B (en) * | 2023-03-13 | 2025-06-20 | 西安热工研究院有限公司 | A resistive molten salt heater for avoiding over-temperature risk and a method of using the same |
| CN119934874A (en) * | 2025-01-08 | 2025-05-06 | 山西建龙实业有限公司 | Molten salt heat storage system, method and power generation system coupled with green electricity heating |
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