CN113525948A - Three-dimensional array type circuit detection system and method for leakage of molten salt storage tank - Google Patents
Three-dimensional array type circuit detection system and method for leakage of molten salt storage tank Download PDFInfo
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- CN113525948A CN113525948A CN202110631465.7A CN202110631465A CN113525948A CN 113525948 A CN113525948 A CN 113525948A CN 202110631465 A CN202110631465 A CN 202110631465A CN 113525948 A CN113525948 A CN 113525948A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
- B65D90/50—Arrangements of indicating or measuring devices of leakage-indicating devices
- B65D90/513—Arrangements of indicating or measuring devices of leakage-indicating devices comprising electrically conductive layers in walls
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Abstract
The invention discloses a three-dimensional array type circuit detection system and method for leakage of a molten salt storage tank, and belongs to the field of leakage detection and treatment of a molten salt storage tank of a photo-thermal power station. The three-dimensional array type lead group is formed by a transverse parallel lead group and a longitudinal parallel lead group which are arranged on layers with different heights; each transverse lead and each longitudinal lead are connected with other components through connecting leads to form a detection circuit comprising a plurality of loops; and a direct current power supply, a switch and a constant value resistor which are connected in series are arranged in each detection loop. The detection system further comprises a data acquisition device for multi-channel acquisition, constant value resistors connected with transverse wires in each loop are respectively connected into different acquisition channels, and the leakage position of the molten salt storage tank is positioned through channel electric signal change caused by molten salt leakage. The method and the device realize the rapid detection and the accurate positioning of the leakage of the molten salt storage tank so as to avoid huge economic loss caused by the expansion of the leakage accident of the storage tank.
Description
Technical Field
The invention relates to the field of leakage detection and treatment of a fused salt storage tank of a photo-thermal power station, in particular to a three-dimensional array type circuit detection system and method for fused salt storage tank leakage.
Background
Among the numerous renewable energy utilization technologies, solar thermal power generation technologies are receiving attention for their high efficiency, low operating costs and good scaling potential. It is estimated that by 2050, solar thermal power generation will account for 11.3% of the global power generation. Compared with other renewable energy utilization technologies, the solar thermal power generation technology has the inherent advantages that the solar thermal power generation technology is integrated with the heat storage system, the heat storage system overcomes the intermittency and fluctuation of solar thermal power generation, and the reliability and the economic competitiveness of the solar thermal power generation technology are obviously improved. In solar thermal power plants currently in operation worldwide, 45.5% of the plants are equipped with heat storage systems.
In order to store thermal energy in a compact or minimal volume, the heat transfer and storage material is preferably a fluid having a large heat capacity and density but a low vapor pressure. Low cost and good transport properties (low viscosity and high thermal conductivity) of the fluid are also important in order to achieve efficient heat transfer and heat energy transport. In addition, the fluid must also be compatible with the thermal storage vessels, piping and fluid delivery valves or have low corrosivity. Based on the above considerations, molten salt is considered to be one of the best choices for the heat transfer and storage medium of the solar thermal power plant.
Due to the characteristics of large capacity of the tank body, large bottom area, high working temperature of media, large thermal stress caused by a cyclic salt charging and discharging process, immature design and manufacturing technology and the like, leakage of the fused salt storage tank of the photo-thermal generator set becomes a worldwide difficult problem. The leakage accidents of the molten salt storage tank occur too much worldwide, which causes great economic loss and even leads to long-time shutdown of the unit. In particular, leakage of the molten salt storage tank tends to have a gradual deterioration process spreading from small to large for a long time. Therefore, in order to ensure the normal operation of the photo-thermal power station, the leakage of the molten salt storage tank is detected early, the early treatment is found early, and the leakage expansion and deterioration are avoided, which is very important.
At present, the photothermal power station mainly detects molten salt leakage by embedding a certain number of thermocouples in the foundation of a molten salt storage tank, such as a molten salt leakage testing device provided by application documents with publication numbers of CN 110296924 a and CN 207850563U. However, considering factors such as cost, installation difficulty, damage to the infrastructure and characteristics after installation of the thermocouples, the number of the pre-embedded thermocouples is limited, and the area of a single thermocouple to be detected is too large. The thermocouple is a point-type temperature measurement technology, and temperature changes can not be detected unless a leakage point is just above and near the thermocouple. Thus, this approach does not achieve good coverage of the entire molten salt reservoir foundation.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a three-dimensional array type circuit detection system and a three-dimensional array type circuit detection method for molten salt storage tank leakage. The number of the wires embedded into the tank base heat insulation material by the three-dimensional array type circuit can be selected according to the actual size of the molten salt storage tank and the detection sensitivity requirement, so that the whole tank base can be well covered. In addition, the three-dimensional array circuit has the advantages of low cost, convenience in laying, small influence on the structure and the characteristics of the tank base and suitability for large-scale popularization and application.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a three-dimensional array type circuit detection system for leakage of a molten salt storage tank comprises a direct-current power supply, a switch, a first fixed-value resistor, a second fixed-value resistor, a data acquisition device and a three-dimensional array type lead group buried in a basic heat insulation material of the molten salt storage tank, wherein the three-dimensional array type lead group comprises a transverse parallel lead group and a longitudinal parallel lead group which are arranged on layers with different heights;
one end of each transverse wire in the transverse parallel wire group is respectively connected with one end of a first constant value resistor, and the first constant value resistors have the same resistance value; one end of each longitudinal wire in the longitudinal parallel wire group is respectively connected with one end of a second constant value resistor, and the resistance values of the second constant value resistors are different;
the other ends of all the first constant value resistors in the transverse parallel lead group are connected with a negative electrode of a direct current power supply, the other ends of all the second constant value resistors in the longitudinal parallel lead group are connected with a positive electrode of the direct current power supply, the transverse parallel lead group and the longitudinal parallel lead group form a detection circuit comprising a plurality of loops through connecting leads, and a direct current power supply, a switch, a first constant value resistor and a second constant value resistor are connected in series in each loop of the detection circuit;
the data acquisition device comprises a plurality of acquisition channels, wherein first constant value resistors connected with one ends of transverse wires are respectively connected into different acquisition channels, electric signals of the first constant value resistors in each detection circuit are respectively acquired, and the leakage position of the molten salt storage tank is positioned through the change of channel electric signals caused by molten salt leakage.
Preferably, the material of the three-dimensional array type lead group is 347H stainless steel.
Preferably, the transverse wires in the transverse parallel wire group are arranged at equal intervals; and all the longitudinal wires in the longitudinal parallel wire group are arranged at equal intervals.
Preferably, the set of transverse parallel wires is perpendicular to the set of longitudinal parallel wires.
Preferably, each transverse wire in the transverse parallel wire group is located at the same height layer in the molten salt storage tank base insulation material, and each longitudinal wire in the longitudinal parallel wire group is located at the same height layer in the molten salt storage tank base insulation material.
Preferably, the first fixed resistor and the second fixed resistor have resistance values at least 10 times as high as the resistance value of the high-temperature molten salt communicating portion.
Preferably, each acquisition channel of the data acquisition device is internally provided with an alarm device, and the alarm device gives an alarm according to the change of the electric signals of the corresponding channels to prompt the leakage of the molten salt storage tank.
Preferably, the molten salt storage tank foundation comprises a plurality of layers of heat insulation materials, and the three-dimensional array type lead sets are arranged in the first layer of heat insulation materials of the molten salt storage tank foundation and close to the bottom of the tank.
Preferably, the three-dimensional array type lead group covers more than 90% of the bottom area of the molten salt storage tank.
The method for detecting the leakage of the molten salt storage tank by using the three-dimensional array type circuit detection system comprises the following steps:
closing the switch, and when the molten salt storage tank normally operates and does not leak molten salt, because the transverse parallel lead group is not contacted with the longitudinal parallel lead group, each detection circuit is in an open circuit state, and no electric signal exists in the circuit; when molten salt leakage occurs, the cross points of the transverse parallel lead groups and the longitudinal parallel lead groups in the height direction are communicated by the leaked high-temperature liquid molten salt, the corresponding detection circuits form a loop, and an electric signal of an acquisition channel in the data acquisition device, which corresponds to the loop, changes and triggers the corresponding alarm device to alarm;
confirming the fused salt leakage position according to the alarm channel, specifically: and confirming the longitudinal coordinate of the cross point according to the alarm channel, and further confirming the transverse coordinate of the cross point according to the numerical value of the electric signal because the resistance values of the second constant value resistors connected with the longitudinal leads are different, wherein the area where the cross point is positioned is the fused salt leakage position.
The invention has the beneficial effects that:
the invention provides a method for realizing leakage detection of a fused salt storage tank of a photo-thermal power station by utilizing a three-dimensional array circuit for the first time based on the conductivity of high-temperature fused salt. The three-dimensional array circuit realizes the rapid detection and the accurate positioning of the leakage of the molten salt storage tank so as to be processed as soon as possible and avoid huge economic loss caused by the expansion of the leakage accident of the storage tank. The number of the wires embedded into the tank base heat insulation material by the three-dimensional array type circuit can be selected according to the actual size of the molten salt storage tank and the detection sensitivity requirement, so that the whole tank base can be well covered. In addition, the three-dimensional array circuit has the advantages of low cost, convenience in laying, small influence on the structure and the characteristics of the tank base and suitability for large-scale popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional array type circuit detection system for leakage of a molten salt storage tank according to the present invention.
FIG. 2 is a schematic diagram of the arrangement of a three-dimensional array of conductor sets in a molten salt storage tank base insulation.
FIG. 3 is a schematic top view of a three dimensional array of conductor sets in a molten salt storage tank base insulation.
In the figure: the system comprises a direct-current power supply 1, a connecting wire 2, a second fixed-value resistor 3, a three-dimensional array type wire group 4, a first fixed-value resistor 5, a switch 6, a data acquisition device 7, a molten salt storage tank bottom 8, a first layer of tank base heat insulation material 9, a second layer of tank base heat insulation material 10 and a concrete base 11.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below. The terms "upper", "lower", "left" and "right" as used herein are set forth with reference to the accompanying drawings, and it is understood that the presence of the terms does not limit the scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, a three-dimensional array type circuit detection system for leakage of a molten salt storage tank includes a direct current power supply 1, a connecting wire 2, a second fixed value resistor 3, a three-dimensional array type wire group 4, a first fixed value resistor 5, a switch 6 and a data acquisition device 7. The direct current power supply 1, the three-dimensional array type lead group 4, the second fixed value resistor 3, the first fixed value resistor 5 and the switch 6 are connected through the connecting lead 2 to form a detection circuit comprising a plurality of loops. Two ends of a first fixed value resistor 5 connected with a transverse parallel wire group in each loop are respectively connected into different channels of a data acquisition device 7, electric signals at two ends of the first fixed value resistor 5 connected with the transverse parallel wire group in each detection circuit are respectively acquired, and alarm devices are respectively arranged in different channels of the data acquisition device 7.
In this embodiment, one end of each transverse wire in the transverse parallel wire group is connected to one end of the first constant resistor 5, and the resistance values of the first constant resistors are the same. One end of each longitudinal wire in the longitudinal parallel wire group is respectively connected with one end of a second fixed value resistor 3, and the resistance values of the second fixed value resistors are different. In order to ensure the sensitivity of leakage detection of the molten salt storage tank, the three-dimensional array type lead group material should adopt a material with good electric conductivity, pressure resistance and high temperature resistance, such as 347H stainless steel. In addition, the resistance value of the fixed resistor should be large enough to minimize the influence of the resistance of the high-temperature molten salt communicating part on the channel electrical signal result of the data acquisition device, and in this embodiment, the resistance values of the first fixed resistor and the second fixed resistor are at least 10 times of the resistance value of the high-temperature molten salt communicating part.
The other ends of all the first fixed-value resistors 5 in the transverse parallel lead group are connected to the negative electrode of the direct-current power supply 1, and the other ends of all the second fixed-value resistors 3 in the longitudinal parallel lead group are connected to the positive electrode of the direct-current power supply 1. Each lead in the transverse parallel lead group and the longitudinal parallel lead group is connected with other components through connecting leads to form a detection circuit comprising a plurality of loops; each detection loop is internally provided with a direct current power supply 1, a switch 6, a first fixed value resistor 5 and a second fixed value resistor 3 which are connected in series.
The molten salt storage tank foundation comprises a plurality of layers of heat-insulating materials. In the present embodiment, as shown in fig. 2 and 3, the lower part of the bottom 8 of the molten salt storage tank comprises a first layer of tank base heat insulation material 9, a second layer of tank base heat insulation material 10 and a concrete foundation 11. The three-dimensional array type wire group 4 is embedded in the first layer of the tank-based heat insulation material 9 and comprises a transverse parallel wire group and a longitudinal parallel wire group which are perpendicular to each other and respectively embedded in different height layers of the tank-based heat insulation material, and the wire groups are in a crossed grid shape in a top view. When the molten salt storage tank normally operates and molten salt leakage does not occur, the transverse parallel lead group and the longitudinal parallel lead group are not communicated.
In actual use, the switch 6 is closed. When the molten salt storage tank normally operates and molten salt leakage does not occur, because the transverse parallel lead group is not in contact with the longitudinal parallel lead group, each loop is in an open circuit state, and no electric signal exists in the circuit; when molten salt leakage occurs, the cross points of the transverse parallel lead groups and the longitudinal parallel lead groups are communicated by the leaked high-temperature liquid molten salt, the electric signals of the corresponding channels in the data acquisition device 7 are changed, and the corresponding alarm devices are triggered to alarm, so that the leakage of the molten salt storage tank is quickly detected and accurately positioned. The method comprises the following two steps of:
once an electrical signal is present in any circuit, the longitudinal location of the leak can be determined.
And secondly, because the sizes of the second constant value resistors 3 connected with the longitudinal conducting wires are different, the transverse position of the leakage can be further judged according to the numerical value of the electric signal.
In practical use, the number of the conducting wires embedded in the tank base heat insulation material can be selected according to the actual size of the molten salt storage tank and the detection sensitivity requirement so as to achieve good coverage of the whole tank base, and the three transverse conducting wires and the three longitudinal conducting wires shown in fig. 1 are only used as illustrations and cannot be regarded as limitations of the invention.
Because the temperature of the tank base is lower than that of the tank, and the temperature of the tank base is gradually reduced along with the increase of the distance from the tank bottom, the leaked molten salt is finally solidified due to heat dissipation, the solidified molten salt has no conductivity, and the corresponding loop can be restored to the open circuit state again.
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 three-dimensional array type circuit detection system for leakage of the molten salt storage tank is characterized by comprising a direct-current power supply (1), a switch (6), a first fixed-value resistor (5), a second fixed-value resistor (3), a data acquisition device (7) and a three-dimensional array type lead group (4) buried in a basic heat insulation material of the molten salt storage tank, wherein the three-dimensional array type lead group comprises a transverse parallel lead group and a longitudinal parallel lead group which are arranged on layers with different heights;
one end of each transverse wire in the transverse parallel wire group is respectively connected with one end of a first fixed-value resistor (5), and the resistance values of the first fixed-value resistors are the same; one end of each longitudinal wire in the longitudinal parallel wire group is respectively connected with one end of a second fixed value resistor (3), and the resistance values of the second fixed value resistors are different;
the other ends of all the first constant value resistors in the transverse parallel lead group are connected with a negative electrode of a direct current power supply, the other ends of all the second constant value resistors in the longitudinal parallel lead group are connected with a positive electrode of the direct current power supply, the transverse parallel lead group and the longitudinal parallel lead group form a detection circuit comprising a plurality of loops through connecting leads, and a direct current power supply, a switch, a first constant value resistor and a second constant value resistor are connected in series in each loop of the detection circuit;
the data acquisition device comprises a plurality of acquisition channels, wherein first constant value resistors connected with one ends of transverse wires are respectively connected into different acquisition channels, electric signals of the first constant value resistors in each detection circuit are respectively acquired, and the leakage position of the molten salt storage tank is positioned through the change of channel electric signals caused by molten salt leakage.
2. The molten salt storage tank leakage solid array type circuit detection system as claimed in claim 1, wherein the solid array type wire set material is 347H stainless steel.
3. The molten salt storage tank leakage solid array type circuit detection system according to claim 1 or 2, wherein each transverse wire in the transverse parallel wire group is arranged at equal intervals; and all the longitudinal wires in the longitudinal parallel wire group are arranged at equal intervals.
4. The molten salt storage tank leakage solid array type circuit detection system according to claim 3, wherein the transverse parallel lead set is perpendicular to the longitudinal parallel lead set.
5. The molten salt storage tank leakage three-dimensional array type circuit detection system according to claim 4, wherein each transverse wire in the transverse parallel wire group is at the same height layer in the molten salt storage tank base insulation material, and each longitudinal wire in the longitudinal parallel wire group is at the same height layer in the molten salt storage tank base insulation material.
6. The system of claim 1, wherein the first fixed resistor and the second fixed resistor have resistance values at least 10 times higher than resistance values of the communicating part of the high temperature molten salt.
7. The system of claim 1, wherein alarm devices are installed in each acquisition channel of the data acquisition device, and the alarm devices give an alarm according to changes of electrical signals of the corresponding channels to prompt leakage of the molten salt storage tank.
8. The molten salt storage tank leakage three-dimensional array type circuit detection system according to claim 1, wherein the molten salt storage tank base comprises multiple layers of heat preservation and insulation materials, and the three-dimensional array type wire sets are arranged in a first layer of insulation materials of the molten salt storage tank base and are close to the bottom of the tank.
9. The molten salt storage tank leakage solid array type circuit detection system of claim 1, wherein the solid array type wire set covers more than 90% of the bottom area of the molten salt storage tank.
10. A method for molten salt storage tank leakage detection using the stereoscopic array circuit detection system of claim 1, comprising:
the switch (6) is closed, when the molten salt storage tank normally operates and molten salt leakage does not occur, because the transverse parallel lead group is not contacted with the longitudinal parallel lead group, each detection circuit is in an open circuit state, and no electric signal exists in the circuit; when fused salt leakage occurs, the cross points of the transverse parallel lead groups and the longitudinal parallel lead groups in the height direction are communicated by the leaked high-temperature liquid fused salt, the corresponding detection circuits form a loop, and an electric signal of an acquisition channel corresponding to the loop in the data acquisition device (7) is changed and triggers a corresponding alarm device to alarm;
confirming the fused salt leakage position according to the alarm channel, specifically: and confirming the longitudinal coordinate of the cross point according to the alarm channel, and further confirming the transverse coordinate of the cross point according to the numerical value of the electric signal because the resistance values of the second constant value resistors connected with the longitudinal leads are different, wherein the area where the cross point is positioned is the fused salt leakage position.
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