CN102135270B - Heat accumulation and evaporation integrated device for solar thermal power generation - Google Patents
Heat accumulation and evaporation integrated device for solar thermal power generation Download PDFInfo
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- CN102135270B CN102135270B CN 201110049637 CN201110049637A CN102135270B CN 102135270 B CN102135270 B CN 102135270B CN 201110049637 CN201110049637 CN 201110049637 CN 201110049637 A CN201110049637 A CN 201110049637A CN 102135270 B CN102135270 B CN 102135270B
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Abstract
The invention discloses a heat accumulation and evaporation integrated device for solar thermal power generation. Spray nozzles (2), an evaporator (3), and a molten salt pump (4) are integrally arranged on a molten salt heat storage tank (1). The evaporator (3) is welded at the bottom of the molten salt heat storage tank (1) and is soaked in molten salt. The spray nozzles (2) are uniformly distributed on the liquid level of the molten salt. Water passes through the evaporator (3) from bottom to top, and natural convection of the molten salt is enhanced and thermocline is subjected to stratification in the evaporation process. A driven natural convection enhancement stratification technology is used, and the evaporator is not required to be provided with an extra pumping system and preheated for long time.
Description
Technical field
The present invention relates to a kind of heat accumulation evaporation integral device for solar energy thermal-power-generating.
Background technology
The remarkable advantage that the solar energy thermal-power-generating technology is different from other renewable energy power generation technology is exactly that it can use large-scale heat-storage technology with the impact for power generation characteristics of the intermittence that overcomes solar energy and instability, make load that solar energy thermal-power-generating can stable output to electrical network, guarantee the stability of electrical network.Simultaneously, the existence of thermal storage device increased the solar energy thermal-power-generating station generated energy and when generating number, reduced the cost of solar energy thermal-power-generating.The best solar energy thermal-power-generating heat-storage technology of present commercial usefulness mainly is the fuse salt heat accumulation of two tanks.Low temperature salt tank stores is 290 ℃ low temperature molten salt approximately, is delivered to the high-temperature fusion salt that produces about 560 ℃ of high temperature in the heat dump by pumping system, then high-temperature fusion salt is stored in the high temperature salt cellar.When night or obnubilation, high-temperature fusion salt is pumped system and sends to the evaporimeter heat release, and then low temperature molten salt flows back to the low temperature salt cellar.The major defect of this technology is that cost is high, use fuse salt amount is large.In order to address the above problem, can adopt and use single melting salt cellar, utilize fuse salt at the different single tank thermocline heat accumulations that can produce the fluid layering principle of different temperatures lower density.The key of single tank thermocline heat-storage technology is stratification and the maintenance of thermocline.Patent WO201000089, US2010031062, US4523629 have described in the melting salt cellar float plate have been installed, and make float plate as thermocline stratification instrument, and hot fluid is on the top of float plate, and cold fluid is in the bottom of float plate.Charge and discharge that float plate can move up and down in the thermal process, stop cold fluid and hot fluid to mix the stratification state that keeps thermocline.Generally the capacity at solar energy thermal-power-generating station is very large, according to the length of heat accumulation time, need to become up to ten thousand tons fuse salt, and therefore, the yardstick of thermal storage device is very large, so, adopt float plate difficulty on making and operation process very big.Describe a kind of inert solid material such as quartz sand and gravel of in the melting salt cellar, adding among paper " Thermal Analysis of Solar Thermal Energy Storage in a Molten-Salt Thermocline " and " the Molten Salt Thermal Energy Storage in Thermoclines under Different EnvironmentBoundary Conditions ", utilized the low technology of strengthening stratification of solid material heat conductivity.It is the technology that realizes stratification with foamed ceramics that patent 200710028077.X and ZL200720051634.5 have described a kind of.No matter be to use which kind of solid material to realize stratification as filler, all there is the consistency problem of material and fuse salt itself, and for the pollution problem of fuse salt.And all above-mentioned technology all need a cover high-temperature fusion salt pumping system, and high-temperature fusion salt is sent to evaporimeter heat release generation water vapour, and therefore, the system complex cost is high.Although ZL200810198461.9 has described a kind of telescopic fuse salt water evaporimeter, the heat release that can be used for high-temperature fusion salt is conducted heat,, it can't realize heat accumulation again.
In a word, existing single tank thermocline heat accumulation all exists thermocline stratification difficulty, the extra high temperature pumping system of needs that high-temperature fusion salt is delivered to evaporimeter, the external start-up course of evaporimeter long shortcoming preheating time.
Summary of the invention
Technical problem to be solved by this invention is:
1, the thermocline stratification problem of single tank thermocline heat accumulation;
2, thermal storage device and evaporimeter are independent, need the problem of extra pumping system;
3, the evaporimeter start-up course is long preheating time, affects the problem of power station service hours.
The scheme that the present invention solves the problems of the technologies described above employing is:
The present invention adopts a kind of heat accumulation evaporation integral device to solve the problems of the technologies described above.The present invention adopts conventional cylindrical vertical melting salt cellar as the fuse salt heat storage can, and the size of its diameter and height is determined according to heat storage capacity.At a plurality of evaporimeters of the bottom welding of fuse salt heat storage can.A plurality of evaporimeters can adopt the triangle of rule, the arrangement such as square, circular in the melting salt cellar, spacing is required to determine by size and the maintenance of evaporation capacity.Evaporimeter is immersed in the fuse salt of fuse salt heat storage can, strengthens the thermocline stratification of fuse salt heat storage can in the process of generating steam, becomes active stratification technology, as: float plate, inert filler are passive type free convection stratification technology.The bottom of evaporimeter is provided with water manifold, and the bottom of water manifold is provided with cooling water inlet.Evaporimeter top is provided with steam header, and the top of steam header is provided with steam (vapor) outlet.Water manifold and steam header couple together by heat exchanger tube.The outer of evaporimeter welds together every cover and disc.Disc and water manifold weld together, by solving thermocline stratification problem every cover outward.A plurality of shower nozzles are installed between the top of fuse salt heat storage can and fuse salt liquid level.The arrangement of shower nozzle can be adopted the layouts such as triangle, square and circle of rule.Shower nozzle is installed on the high-temperature fusion salt pipeline according to conventional method.High-temperature fusion salt pipeline enters the melting salt cellar and in the direction top set parallel with the fuse salt liquid level, designs the bifurcation approach of fuse salt pipeline according to the arrangement mode of shower nozzle from fuse salt heat storage can top.High-temperature fusion salt from heat dump enters the fuse salt heat storage can from fuse salt thermal storage device top through the distribution of shower nozzle with after atomizing.The melting salt pump is vertically mounted on the top of fuse salt heat storage can, and the melting salt pump is extracted the low temperature molten salt of fuse salt bottom out and delivered to the heat dump heating.The evaporimeter that is integrated in the fuse salt heat storage can is immersed in the high-temperature fusion salt, do not need extra high-temperature fusion salt pumping system that high-temperature fusion salt is delivered to evaporimeter, overcome conventional evaporimeter and be arranged on outside the heat storage can, the shortcoming that needs extra pumping system to carry high-temperature fusion salt to enter evaporimeter.Because evaporimeter is immersed in the high-temperature fusion salt always, therefore, device temperature is always higher, and the long-time preheating when not needing conventional evaporimeter to start has solved the startup Preheating of evaporimeter.Its course of work is: device of working medium enters from the bottom of evaporimeter, because evaporimeter is immersed in the fuse salt thermal storage device.High-temperature fusion salt by free convection with heat transferred water, water evaporates in evaporimeter and produces HTHP and satisfy the steam that turbine parameters requires and enter steam turbine acting generating, and in thermal storage device the fuse salt of free convection, bottom temp at evaporimeter is low than the temperature on evaporimeter top, hot fluid is because the low top that swims in of density, cold fluid sinks naturally, realizes the stratification of fuse salt.Evaporimeter outer every cover free convection is limited in evaporator surface and outside between cover, thereby strengthen and the protection thermocline.
The present invention utilizes the evaporimeter cold fluid to need the characteristics of molten heat transmission evaporation, in the process of water evaporation, make the fuse salt free convection in the evaporimeter outside, realize the stratification of nature, without any need for float plate or filler and pumping system, simple in structure, steamer is short start-up time, heat accumulation and evaporation integral.
Description of drawings
Fig. 1 heat accumulation evaporation integral structure drawing of device;
Fig. 2 evaporimeter front view;
Fig. 3 evaporimeter top view;
Among the figure: 1 fuse salt heat storage can, 2 shower nozzles, 3 evaporimeters, 4 melting salt pumps, 5 steam headers, 6 heat exchanger tubes, 7 water manifolds, 8 supporting legs, 9 are outward every cover, 10 disc.
The specific embodiment
Fig. 1 is heat accumulation evaporation integral structure drawing of device of the present invention.Be furnished with shower nozzle 2, evaporimeter 3 and melting salt pump 4 in the fuse salt heat storage can 1.A plurality of shower nozzles 2 are installed between fuse salt heat storage can 1 top and the fuse salt liquid level, are positioned at more than the fuse salt liquid level, and according to the triangle of rule, square or circular even distribution.Shower nozzle is installed on the high-temperature fusion salt pipeline according to conventional method.High-temperature fusion salt pipeline enters the melting salt cellar and in the direction top set parallel with the fuse salt liquid level, designs the bifurcation approach of fuse salt pipeline according to the arrangement mode of shower nozzle from fuse salt heat storage can top.The high-temperature fusion salt that comes from heat dump passes through after equally distributed shower nozzle 2 shuntings, and low speed drops equably on the fuse salt liquid level of fuse salt heat storage can 1, the low top that naturally rests on fuse salt thermal storage device 1 of high-temperature fusion salt density.Fuse salt flow and the flow velocity of shunting are lower, can prevent when fluid from entering the disturbance for fuse salt heat storage can 1 interior fuse salt, the thermal stratification that is conducive to keep fuse salt.A plurality of evaporimeters 3 evenly distribute and are immersed in the fuse salt in the fuse salt heat storage can 1, according to the triangle of rule, the arrangement such as square or circular and be welded on the bottom of fuse salt heat storage can 1.Water at low temperature enters from the bottom of evaporimeter 3, and cold water flows in evaporimeter from bottom to top, and high-temperature fusion salt heats cold steeping in water for reconstitution is on every side given birth to the steam of desired parameters.In the process of evaporimeter generating steam, high-temperature fusion salt on every side can naturally produce free convection, the fuse salt density of low temperature sinks to greatly the bottom of fuse salt heat storage can 1, float to the top of fuse salt heat storage can 1 in the little meeting of high-temperature fusion salt density, like this self-assembling formation thermocline in fuse salt heat storage can 1.The melting salt pump 4 that is vertically mounted on fuse salt heat storage can 1 top is deep in the fuse salt always, until near the bottom of fuse salt heat storage can 1, extract low temperature molten salt out from the bottom of fuse salt heat storage can 1, be pumped into heat absorption generation high-temperature fusion salt in the heat dump, high-temperature fusion salt flows back to the fuse salt heat storage can 1 through shower nozzle 2 again from the top of fuse salt heat storage can 1.
Fig. 2, Fig. 3 are respectively front view and the top views of evaporimeter.The tube bank that the heating surface of evaporimeter 3 is comprised of heat exchanger tube 6 forms.Many heat exchanger tubes 6 are arranged according to modes such as circle, triangles, and the lower end of heat exchanger tube 6 is inserted in the water manifold 7 of cylindrical sealing, and the upper end of heat exchanger tube 6 is inserted in the steam header 5 of cylindrical sealing.Have between the every heat exchanger tube 6 in the heat-exchanging tube bundle and leave enough spaces, can not close-packed arrays.Water manifold 7 and steam header 5 are coupled together by water pipe and steam pipe respectively, are used for supplying water and going out steam.Disc 10 is with water manifold 7 and weld together to fix every cover 9 outward.For eliminate outer every between cover 9 and the tube bank that heat exchanger tube 6 forms owing to the different stress that may cause of swell increment, contact between disc 10 and the steam header 5 but fixing, but relative sliding, so that tube bank, water manifold 7 and steam header 5 that heat exchanger tube 6 forms can be with respect to moving up and down every cover 9 outward.Supporting leg 8 with weld together every cover 9 and water manifold 7 outward, and be welded on the bottom of fuse salt heat storage can 1, the device 3 that avoids evaporating is in the 1 interior drift of fuse salt heat storage can.Evaporimeter 3 is together with being immersed in the fuse salt heat storage can 1 every cover 9 outward.Cold water enters from water manifold 7, the molten heat transmission feedwater of bottom becomes low temperature molten salt, along with water rises in heat exchanger tube 6, gradually by high-temperature fusion salt heat temperature raising on every side, therefore, fuse salt is also higher in higher position temperature on the short transverse, outward every being the violent zone of convection current between cover 9 and the heat exchanger tube 6, the low temperature molten salt of heat exchange can nature from outside flow out every cover 9 bottoms, high-temperature fusion salt from outside every the inflow of cover 9 tops, namely realize the heating to water, strengthened again the stratification of thermocline.
Claims (4)
1. heat accumulation evaporation integral device that is used for solar energy thermal-power-generating, it is characterized in that: described heat accumulation evaporation integral device comprises fuse salt heat storage can (1), shower nozzle (2), evaporimeter (3) and melting salt pump (4); Shower nozzle (2), evaporimeter (3) and melting salt pump (4) integrated installation are in fuse salt heat storage can (1); Be evenly arranged a plurality of shower nozzles (2) in the fuse salt heat storage can (1), shower nozzle (2) is installed between the top and fuse salt liquid level of fuse salt heat storage can (1), and is positioned at more than the fuse salt liquid level; A plurality of evaporimeters (3) are immersed in the fuse salt, and are welded on fuse salt heat storage can (1) bottom, and are evenly arranged;
Described evaporimeter (3) comprises the heat-exchanging tube bundle that is comprised of many heat exchanger tubes (6), steam header (5), water manifold (7), supporting leg (8), outward every cover (9) and disc (10); Described water manifold (7) is positioned at the bottom of described evaporimeter (3); Described steam header (5) is positioned at the top of described evaporimeter (3); Insert in the water manifold (7) lower end of described heat exchanger tube (6), and insert in the steam header (5) upper end of heat exchanger tube (6); Described water manifold (7) and outward every the cover (9) weld together by disc (10); Disc (10) with weld together every cover (9) outward, disc (10) contacts also relative sliding with steam header (5); Supporting leg (8) is positioned at water manifold (7) and outward on cover (9), and is welded on fuse salt heat storage can (1) bottom.
2. according to the heat accumulation evaporation integral device for solar energy thermal-power-generating claimed in claim 1, it is characterized in that: in the described heat-exchanging tube bundle, many heat exchanger tubes (6) are arranged according to circle or triangle manner, leave the space between the every heat exchanger tube (6).
3. according to the heat accumulation evaporation integral device for solar energy thermal-power-generating claimed in claim 1, it is characterized in that: described melting salt pump (4) is vertically mounted on the top of fuse salt heat storage can (1), and be inserted in the fuse salt, until near the bottom of fuse salt heat storage can (1).
4. according to the heat accumulation evaporation integral device for solar energy thermal-power-generating claimed in claim 1, it is characterized in that: described shower nozzle (2) is installed on the interior high-temperature fusion salt pipeline of fuse salt heat storage can (1), high-temperature fusion salt pipeline enters melting salt cellar (1) from the top of fuse salt heat storage can (1), and in the direction top set parallel with the fuse salt liquid level.
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| CN 201110049637 CN102135270B (en) | 2011-03-01 | 2011-03-01 | Heat accumulation and evaporation integrated device for solar thermal power generation |
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| CN 201110049637 CN102135270B (en) | 2011-03-01 | 2011-03-01 | Heat accumulation and evaporation integrated device for solar thermal power generation |
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| CN102135270B true CN102135270B (en) | 2013-10-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016205804A (en) * | 2015-04-16 | 2016-12-08 | 太陽光電能源科技股▲ふん▼有限公司Ｂｉｇ Ｓｕｎ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃ． | Spray type heat insulating steam supply device and power generation facility using the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102418917A (en) * | 2011-12-08 | 2012-04-18 | 江苏太阳宝新能源有限公司 | Solar photo-thermal power generation energy storage tank and steam generator optimized structure |
| CN107702086B (en) * | 2017-10-24 | 2023-10-20 | 西安西热节能技术有限公司 | Peak regulating system and method for storing heat by using molten salt |
| CN109307445A (en) * | 2018-10-17 | 2019-02-05 | 朱焕旺 | Fused salt spray solidification heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2851982Y (en) * | 2005-12-06 | 2006-12-27 | 北京工业大学 | Double-medium solar high-temperature heat absorbing and storing device |
| CN201043869Y (en) * | 2007-05-18 | 2008-04-02 | 东莞理工学院 | High-temperature thermocline mixed heat accumulation device in molten salt |
| US8925543B2 (en) * | 2009-01-13 | 2015-01-06 | Aerojet Rocketdyne Of De, Inc. | Catalyzed hot gas heating system for pipes |
| US7987844B2 (en) * | 2009-01-13 | 2011-08-02 | Hamilton Sundstrand Corporation | Catalyzed hot gas heating system for concentrated solar power generation systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016205804A (en) * | 2015-04-16 | 2016-12-08 | 太陽光電能源科技股▲ふん▼有限公司Ｂｉｇ Ｓｕｎ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃ． | Spray type heat insulating steam supply device and power generation facility using the same |
| US10256636B2 (en) | 2015-04-16 | 2019-04-09 | Big Sun Energy Technology Inc. | Spraying heat preservation vapor supplying device and generator apparatus using such device |
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