CN110296924B - System and method for testing seepage condition of fused salt leaked from photo-thermal power generation heat storage system in foundation - Google Patents
System and method for testing seepage condition of fused salt leaked from photo-thermal power generation heat storage system in foundation Download PDFInfo
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- CN110296924B CN110296924B CN201910578145.2A CN201910578145A CN110296924B CN 110296924 B CN110296924 B CN 110296924B CN 201910578145 A CN201910578145 A CN 201910578145A CN 110296924 B CN110296924 B CN 110296924B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000010248 power generation Methods 0.000 title claims abstract description 27
- 238000005338 heat storage Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000009826 distribution Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 abstract description 4
- 238000003860 storage Methods 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
- F24S40/90—Arrangements for testing solar heat collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a test system for the seepage condition of fused salt leaked from a photo-thermal power generation heat storage system in a foundation, which comprises: a tank filled with a foundation material; the heating plate is positioned above the tank body and can lift, and the temperature control device is connected with the heating plate; a crucible which can be placed on top of the foundation material and has a leakage hole; the temperature sensors are arranged spirally along the axial direction of the tank body at different heights and used for detecting the depth of the seepage molten salt, and are arranged circumferentially at the same height, and the distance between each temperature measuring point and the central shaft is different and used for detecting the width of the seepage molten salt. Based on the test system, the invention also discloses a test method for the seepage condition of the fused salt leaked from the photo-thermal power generation heat storage system in the foundation. The method can be used for measuring the seepage condition of the leaked molten salt in the foundation when the molten salt tank leaks under different operating temperatures of different molten salts.
Description
Technical Field
The invention relates to the field of seepage condition control and treatment of leakage of a high-temperature molten salt storage tank in a photo-thermal power generation energy storage system, in particular to a system and a method for testing seepage condition of leakage molten salt of a photo-thermal power generation heat storage system in a foundation.
Background
In the application of solar energy, the solar heat storage power generation technology has the scheduling potential and is a renewable energy utilization mode with development potential. In the solar thermal power generation technology, through the heat energy storage device, redundant heat energy is stored when solar energy is sufficient, and the stored heat energy is released to meet the power generation requirement when the solar energy is insufficient, so that the effects of power buffering and peak clipping and valley filling are achieved. The double-tank type molten salt indirect heat storage system is the most common heat storage form in focusing solar power generation, and the molten salt has the characteristics of high temperature, large specific heat capacity and easy leakage at a welding position. When the fused salt leaks, the fused salt can pollute the heat-insulating layer on the outer side of the storage tank, and permeates into the foundation and soil, and even influences the safety of the whole power station.
Leakage of molten salt tanks is currently an important problem facing photovoltaic power stations. The fused salt medium temperature is high to the temperature distribution of fused salt medium in the storage tank is inhomogeneous, and filling salt and putting the change of salt in-process liquid level and temperature, can make the thermal energy of the different positions of fused salt storage tank jar body different, thereby make the jar body bear huge thermal stress, easily cause jar body deformation, and then lead to jar body to break and lead to the fact the leakage accident of fused salt jar.
The research on the seepage process of the leaked molten salt in the storage tank foundation after the leakage accident of the molten salt tank occurs is extremely lacking, the leaked molten salt is controlled through a leakage pool in the existing research, and the damage caused by molten salt leakage is reduced, but the method is not practical to be implemented in the storage tank foundation with the site diameter of 40m, the seepage condition of the molten salt in the internal foundation cannot be determined, and the related content of the seepage condition of the molten salt in the storage tank foundation is not provided at present.
Disclosure of Invention
The invention aims to provide a test system and a test method for the seepage condition of fused salt leaked from a photo-thermal power generation heat storage system in a foundation, which can be used for testing the seepage condition of the leaked fused salt in the foundation when a fused salt tank leaks in the photo-thermal power generation energy storage system under different types of fused salts and different operating temperatures.
In order to achieve the purpose, the invention adopts the following technical scheme:
a test system for testing seepage condition of fused salt leaked from a photo-thermal power generation heat storage system in a foundation comprises:
a tank filled with a foundation material;
the heating plate is positioned above the tank body and can lift, and the temperature control device is connected with the heating plate;
the crucible can be placed on the top of the foundation material and is provided with leakage holes, and the crucible is used for containing preheated and molten high-temperature molten salt;
the temperature sensors are arranged spirally along the axial direction of the tank body at different heights and used for detecting the depth of the seepage molten salt, and are arranged circumferentially at the same height, and the distance between each temperature measuring point and the central shaft is different and used for detecting the width of the seepage molten salt.
Preferably, a lifting device is installed at the top of the heating plate and used for driving the heating plate to lift. The lifting device can be hoisting equipment and the like.
Preferably, a temperature sensor and an electric heating wire are installed in the heating plate, and are respectively connected with a temperature control device for regulating and controlling the heating temperature.
Preferably, the top of the heating plate and the wall surface of the tank body are both provided with heat insulating layers.
Preferably, the test system further comprises a bracket for supporting the tank body, and the bottom of the tank body is provided with a baffle capable of being opened and closed, so that the foundation material can be conveniently filled and taken out.
Preferably, the temperature sensor is a thermocouple.
Preferably, a temperature recording device connected with each temperature sensor is provided for recording the temperature change of the molten salt seepage and the heat dissipation solidification process.
A test method for the seepage condition of fused salt leaked from a photo-thermal power generation heat storage system in a foundation is realized based on the test system and comprises the following specific steps:
s1, lifting the heating plate, filling the foundation material in the tank body and compacting;
s2, the top heating plate falls down and is tightly combined with the upper part of the tank body, the temperature control device is started, the temperature of the heating plate rises to the actual operating temperature of the molten salt tank, and the heating state is maintained until the temperature distribution of the base material in the tank body reaches the balance state;
s3, lifting the heating plate, placing a crucible with a leakage hole in the center of the top of the foundation material, pouring the preheated and melted high-temperature molten salt into the crucible, and simulating the leakage hole of the molten salt tank through the hole in the bottom of the crucible;
and S4, after the leakage of the molten salt is finished, taking away the crucible, putting down the heating plate, keeping the temperature of the heating plate at the original heating temperature, and recording the temperature change of the molten salt seepage and the heat dissipation solidification process by the temperature sensor in the accumulation foundation.
In step S2, the heating pan simulates a hot molten salt storage tank, and reaches an equilibrium state after heating the foundation material for approximately 72 hours.
According to the method, the leakage molten salt seepage depth and width are measured according to the temperature change of the temperature sensor, or the leakage molten salt seepage depth and width are measured according to the sizes of the molten salt and the foundation material condensation blocks taken out after seepage is finished.
The invention has the following beneficial effects:
(1) because the operation temperature of the molten salt tank is higher, generally 290-570 ℃, the system replaces the molten salt tank with the heating plate to heat the foundation material, so that the test system is simplified, and the heat balance state of the foundation is ensured to be consistent with the actual condition;
(2) the temperature sensors are reasonably arranged in the axial direction and the radial direction, detect and record the temperature change of each position, and can effectively reflect the seepage process of the leaked molten salt in the foundation;
(3) the foundation material is filled according to different particle sizes, proportions and compactness, is closer to the field condition of the photo-thermal power station, and ensures the effectiveness of the test system.
Drawings
FIG. 1 is a schematic structural diagram of a system for testing seepage of molten salt leaked from a thermal power generation heat storage system in a foundation according to the present invention;
in the figure: 1-heating a plate; 2-a lifting device; 3-a temperature control device; 4-heat insulating material; 5-tank body; 6-temperature sensor; 7-temperature recording means; 8-a scaffold; 9-bottom baffle; 10-crucible.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in figure 1, the system for testing the seepage condition of the leaked molten salt in the foundation is suitable for a photo-thermal power generation molten salt heat storage system and specifically comprises a heating plate 1 with a lifting device 2, a tank body 5 piled on the foundation, a heat insulation material 4 and a support 8 of the tank body, a temperature sensor 6, a temperature control device 3, a temperature recording device 7 and a crucible 10.
The heating plate 1 can effectively and simply simulate the heating of a fused salt storage tank to a foundation, a temperature sensor and an electric heating wire are arranged in the heating plate, the heating plate is connected with a temperature control device 3, and the heating temperature is regulated and controlled by controlling the electric heating power; the foundation material is filled in the tank body 5 according to different grain diameters, proportions and compactibility, and the wall surface of the foundation accumulation tank body and the top of the heating plate are both provided with heat insulation materials 4; the tank body is provided with a bracket 8 and a bottom baffle 9, and the opening and closing of the baffle are realized through a specially designed valve, so that the filling and the taking out of the foundation material are facilitated.
The number and the interval of the measuring points of the temperature sensor 6 can be selected according to requirements, the depth detection of the seepage molten salt is realized by spirally arranging along the axial direction on different heights, the depth detection of the seepage molten salt is realized by arranging along the circumferential direction on the same height, and the width detection of the seepage molten salt is realized by different distances between each measuring point and the central shaft.
Example 2
According to the test system in the embodiment 1, the test method for the seepage condition of the fused salt leaked by the photo-thermal power generation heat storage system in the foundation comprises the following steps:
s1, lifting the heating plate 1, filling the foundation material into the tank body 5 according to the requirements of particle size and thickness, and compacting the foundation material according to the requirement of compactness;
s2, dropping the top heating plate 1, tightly combining with the upper part of the tank body 5, starting the heating device 3, raising the temperature of the heating plate to the actual operating temperature of the molten salt tank, starting the temperature test 6 and the recording device 7, and maintaining the heating state until the temperature distribution of the base material in the tank body reaches the balance state;
s3, lifting the heating plate 1, placing a crucible 10 with a leakage hole in the center of the top of the foundation material, pouring preheated and melted high-temperature molten salt into the crucible in a controlled manner, and simulating the leakage hole of the molten salt tank through the hole in the bottom of the crucible 10;
s4, after the leakage of the molten salt is finished, taking away the crucible 10, putting down the heating plate 1, keeping the temperature of the heating plate at the original heating temperature, and recording the temperature change of the molten salt seepage and the heat dissipation solidification process by the temperature sensor 6 and the temperature recording device 7 in the accumulation foundation;
s5, after the temperature of the foundation material and the molten salt in the tank body is stable, the heating plate 1 stops heating, after the temperature of the foundation material is cooled to normal temperature, the bottom baffle 9 is opened, the foundation material block body after the molten salt is solidified is taken out, and the seepage depth and the seepage width at different positions are measured.
The above description is only exemplary of the preferred embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a test system of solar-thermal power generation heat-retaining system leakage fused salt seepage flow condition in the ground which characterized in that includes:
a tank filled with a foundation material;
the heating plate is positioned above the tank body and can lift, and the temperature control device is connected with the heating plate;
the crucible can be placed on the top of the foundation material and is provided with leakage holes, and the crucible is used for containing preheated and molten high-temperature molten salt;
the temperature sensors are arranged spirally along the axial direction of the tank body at different heights and used for detecting the depth of the seepage molten salt, and are arranged circumferentially at the same height, and the distance between each temperature measuring point and the central shaft is different and used for detecting the width of the seepage molten salt.
2. The system for testing the seepage condition of the molten salt leaked from the photo-thermal power generation heat storage system in the foundation as claimed in claim 1, wherein a lifting device is installed on the top of the heating plate and used for driving the heating plate to lift.
3. The system for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system according to claim 1, wherein a temperature sensor and a heating wire are installed in the heating plate and are respectively connected with a temperature control device for regulating and controlling the heating temperature.
4. The system for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system according to claim 1, wherein the top of the heating plate and the wall surface of the tank body are both provided with insulating layers.
5. The system for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system as claimed in claim 1, wherein the testing system further comprises a bracket for supporting the tank body, and the bottom of the tank body is provided with a baffle capable of being opened and closed.
6. The system for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system as claimed in claim 1, wherein the temperature sensor is a thermocouple.
7. The system for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system as claimed in claim 1, wherein a temperature recording device connected with each temperature sensor is arranged.
8. A testing method for seepage condition of fused salt leaked from a photo-thermal power generation heat storage system in a foundation is realized based on the testing system of any one of claims 1-7, and comprises the following specific steps:
s1, lifting the heating plate, filling the foundation material in the tank body and compacting;
s2, the top heating plate falls down and is tightly combined with the upper part of the tank body, the temperature control device is started, the temperature of the heating plate rises to the actual operating temperature of the molten salt tank, and the heating state is maintained until the temperature distribution of the base material in the tank body reaches the balance state;
s3, lifting the heating plate, placing a crucible with a leakage hole in the center of the top of the foundation material, pouring the preheated and melted high-temperature molten salt into the crucible, and simulating the leakage hole of the molten salt tank through the hole in the bottom of the crucible;
and S4, after the leakage of the molten salt is finished, taking away the crucible, putting down the heating plate, keeping the temperature of the heating plate at the original heating temperature, and recording the temperature change of the molten salt seepage and the heat dissipation solidification process by the temperature sensor accumulated in the foundation.
9. The method for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system according to claim 8, wherein in step S3, the molten salt is heated and kept for 6-8 hours, so that the components of the molten salt are uniformly mixed and sufficiently melted.
10. The method for testing the seepage condition of the leaked molten salt in the foundation of the photo-thermal power generation heat storage system according to claim 8, wherein the seepage depth and width of the leaked molten salt are measured according to the temperature change of the temperature sensor, or the seepage depth and width are measured through the sizes of the molten salt solidified after the seepage is finished and the foundation material.
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| CN111879019B (en) * | 2020-06-12 | 2022-03-18 | 浙江大学 | System for detecting fused salt leakage of photo-thermal power generation heat storage device by utilizing electrode plate |
| CN115825145B (en) * | 2022-11-18 | 2023-07-11 | 哈尔滨工业大学 | High-temperature liquid molten salt heat radiation and heat conduction parameter combined measurement device and inversion method |
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| CN102363962B (en) * | 2011-10-31 | 2014-01-08 | 江苏太阳宝新能源有限公司 | Composite functional storage tank foundation of photo-thermal power generation high-temperature fused salt storage tank |
| CN205641606U (en) * | 2016-03-22 | 2016-10-12 | 浙江中控太阳能技术有限公司 | A pond is revealed to fused salt for solar thermal energy power plant |
| CN106018747A (en) * | 2016-06-25 | 2016-10-12 | 西安科技大学 | Coal gangue leachate infiltration soil column simulation system and characteristic parameter determination method |
| CN105911257A (en) * | 2016-06-25 | 2016-08-31 | 西安科技大学 | Multi-state undisturbed soil column infiltration simulation system and unsaturated osmotic coefficient determination method |
| CN106908475A (en) * | 2017-04-07 | 2017-06-30 | 中国能源建设集团科技发展有限公司 | Ground rock heat transduction assay system and method |
| JP2019059987A (en) * | 2017-09-27 | 2019-04-18 | 日立金属株式会社 | Detecting method of leakage of contents from electrolytic bath of molten salt electrolytic apparatus and molten salt electrolytic apparatus |
| CN207850563U (en) * | 2018-03-02 | 2018-09-11 | 中国成达工程有限公司 | Fused salt storage tank thermometric and leak detecting device |
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