CN219829139U - Built-in electric tracing fused salt heat collecting pipe assembly and groove type solar heat collector - Google Patents
Built-in electric tracing fused salt heat collecting pipe assembly and groove type solar heat collector Download PDFInfo
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- CN219829139U CN219829139U CN202321048192.4U CN202321048192U CN219829139U CN 219829139 U CN219829139 U CN 219829139U CN 202321048192 U CN202321048192 U CN 202321048192U CN 219829139 U CN219829139 U CN 219829139U
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- collecting tube
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- 238000012423 maintenance Methods 0.000 abstract description 12
- 238000009833 condensation Methods 0.000 abstract description 11
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- 238000000034 method Methods 0.000 abstract description 6
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- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
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- 230000005496 eutectics Effects 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- PDEDQSAFHNADLV-UHFFFAOYSA-M potassium;disodium;dinitrate;nitrite Chemical compound [Na+].[Na+].[K+].[O-]N=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PDEDQSAFHNADLV-UHFFFAOYSA-M 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Abstract
The utility model belongs to the technical field of photo-thermal power generation, and particularly discloses a built-in electric tracing fused salt heat collecting tube assembly and a trough type solar heat collector. The built-in electric tracing molten salt heat collecting pipe assembly is simple in assembly and installation operation, the arrangement and connection of the heating cables are convenient and firm, the heating cables are introduced into the heat collecting pipe, and electric heating of the inside of the heat collecting pipe is realized; the solar heat collector is applied to a trough type solar heat collector, preheating, full salt maintenance heating and empty pipe maintenance heating of the heat collecting pipe can be realized, molten salt condensation is prevented from blocking the heat collecting pipe, condensation prevention of a molten salt medium heat collecting loop is effectively realized, solar radiation resources and condensation heat collecting time are occupied in the process of salt dredging, preheating and salt recharging of the heat collecting loop every day are avoided, operation and maintenance difficulty and cost are reduced, and the whole heat collecting system is safer and more reliable to operate.
Description
Technical Field
The utility model belongs to the technical field of photo-thermal power generation, and relates to a built-in electric tracing fused salt heat collecting tube assembly and a trough type solar heat collector.
Background
According to the different light-condensing modes, the photo-thermal power station can be divided into four types of groove type, tower type, linear Fresnel type and disc type. Among them, the slot type photo-thermal power generation is the photo-thermal power generation technology which is most widely applied and mature. At present, most of groove type photo-thermal power stations adopt heat conduction oil as a heat transfer medium, the highest temperature of steam generated by the heat conduction oil as the heat transfer medium can only reach 393 ℃, the steam Rankine cycle efficiency can only reach 37%, and the price of high-temperature heat conduction oil is very expensive. If molten salt is used as a heat transfer medium, the working temperature can reach more than 550 ℃, the steam Rankine cycle efficiency can reach more than 40%, the power generation efficiency can be remarkably improved, and the cost is low. In recent years, the trough type solar heat collector has a large development trend, and the investment cost of a concentrating heat collection field is further reduced by matching with the application of molten salt as a heat transfer medium, so that the energy output of the unit heat collector is improved, and the system performance of the trough type photo-thermal power station is further improved.
The condensation prevention of the fused salt medium heat collection loop of the photo-thermal power station can be realized by reasonably arranging the start and stop of a heat collection system and combining an auxiliary heat source. For a line focusing photo-thermal power station, a mode of evacuating molten salt in a heat collection loop can be adopted to avoid the molten salt freezing blocking when the line focusing photo-thermal power station is stopped every day, solar radiation energy is utilized to preheat the heat collection tube after sunrise for the next day, and the molten salt in a molten salt tank is refilled into the heat collection loop after the heat collection tube meets the salt filling temperature condition. The heat collection loop is arranged or designed to be a certain gradient (0.1%) by utilizing the natural gradient of the field, and the molten salt in the pipeline is discharged to a molten salt tank for storage by utilizing gravity and compressed air. In addition, in order to ensure that the inlet main pipe and the connecting pipe have higher temperature when the system starts to charge salt the next day, the heat preservation of the pipe walls of the main pipe and the connecting pipe at night is completed by adopting external hot fluid heat tracing, and the heat is derived from molten salt in the storage tank. The anti-condensation operation scheme greatly reduces the night heat loss, but has certain requirements on the size of a project site, the gradient and the heat collection loop arrangement. In addition, the solar radiation resources and the concentrating and heat collecting time are occupied in the daily salt dredging, preheating and recharging processes of the heat collecting loop, the preheating process is controlled more complicated, and the operation and maintenance difficulty and the cost are increased.
Disclosure of Invention
The utility model aims to provide a built-in electric tracing fused salt heat collecting pipe assembly and a trough type solar heat collector, and the fused salt is prevented from being condensed and blocking the heat collecting pipe by electrically heating the heat collecting pipe.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a built-in electric tracing fused salt heat collecting pipe assembly comprises a supporting pipe, a transition pipe, a heat collecting pipe, a cable joint, a heating cable and a sealing plug;
the supporting tube, the transition tube and the heat collecting tube are hollow structures, and the heat collecting tube is internally filled with molten salt;
the two ends of the supporting tube are respectively connected with the heat collecting tube in series, the two ends of the transition tube are respectively connected with the heat collecting tube in series, and the supporting tube, the transition tube and the heat collecting tube are communicated;
the cable connector is arranged on the support tube and/or the transition tube and used for being connected with a power supply, and a cable hole is formed in one side of the cable connector on the support tube and/or the transition tube;
the wiring end of the heating cable is connected with the cable joint, and the heating cable is introduced into the heat collecting pipe through the cable hole and extends along the axial direction of the heat collecting pipe;
and the cable hole is in sealing connection with the heating cable, and the sealing plug is in sealing connection with the heating cable.
Preferably, the lower end of the supporting tube is connected with a supporting frame.
Preferably, the support frame comprises a support rod and an assembly plate, wherein the upper end of the support rod is fixedly connected with the bottom of the support tube, and the lower end of the support rod is fixedly connected with the assembly plate.
Preferably, the heating cable is a double-core wire, the double-core wires at one end of the heating cable are respectively connected with the cable connector, and the other end of the heating cable is led into the heat collecting tube through the cable hole and extends along the axial direction of the heat collecting tube.
Preferably, the heating cable is provided as a mineral insulated heating cable.
Preferably, the transition pipe is connected with the heat collecting pipe through a corrugated pipe.
Preferably, the support pipe and the transition pipe are made of a metal material, and the heat collecting pipe is made of a glass material.
The trough type solar heat collector comprises a tower, and further comprises the built-in electric tracing molten salt heat collecting pipe assembly, wherein the supporting pipe is arranged on the tower.
Compared with the prior art, the utility model has the following beneficial effects:
as described above, the utility model relates to a built-in electric tracing molten salt heat collecting tube assembly, which is simple in assembly and installation operation, convenient in arrangement and connection of heating cables and firm in connection, and the heating cables are led into the heat collecting tube to realize electric heating of the inside of the heat collecting tube; the solar heat collector is applied to a trough type solar heat collector, preheating, full salt maintenance heating and empty pipe maintenance heating of the heat collecting pipe can be realized, molten salt condensation is prevented from blocking the heat collecting pipe, condensation prevention of a molten salt medium heat collecting loop is effectively realized, solar radiation resources and condensation heat collecting time are occupied in the process of salt dredging, preheating and salt recharging of the heat collecting loop every day are avoided, operation and maintenance difficulty and cost are reduced, and the whole heat collecting system is safer and more reliable to operate.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic structural diagram of a built-in electric tracing molten salt heat collecting tube assembly in an embodiment of the utility model;
FIG. 2 is a perspective view of a support tube and a support frame according to an embodiment of the present utility model;
FIG. 3 is a front view of a support tube and a support frame according to an embodiment of the present utility model;
FIG. 4 is a side view of a support tube and support frame according to an embodiment of the present utility model;
FIG. 5 is a perspective view of a trough solar collector tower section in an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.
Examples:
as shown in fig. 1 to 5, a built-in electric tracing molten salt heat collecting tube assembly comprises a support tube 1, a transition tube 2, a heat collecting tube 3, a cable joint 4, a heating cable 5 and a sealing plug 6.
The inside of stay tube 1, transition pipe 2 and thermal-arrest pipe 3 is hollow structure, and thermal-arrest pipe 3 is concatenate respectively at the both ends of stay tube 1, and thermal-arrest pipe 3 is concatenate respectively at the both ends of transition pipe 2, communicates between stay tube 1, transition pipe 2 and thermal-arrest pipe 3 three. Wherein, the transition pipe 2 is connected with the heat collecting pipe 3 through a corrugated pipe 8. The support pipe 1, the transition pipe 2, and the bellows 8 are made of a metal material (stainless steel), and the heat collecting pipe 3 is made of a glass material.
The inside of the support tube 1, the transition tube 2, the bellows 8 and the heat collecting tube 3 is used for filling molten salt. Molten salt refers to a liquid salt formed by melting inorganic salts at high temperatures. The inorganic salt in a molten state is mostly ion crystal in solid state, and forms ion melt after high-temperature melting. Common molten salts mainly include carbonates, chlorides, nitrates, fluorides, and the like. Nitrate is widely applied in the field of solar thermal power generation by the remarkable advantages of low price, low corrosiveness and no decomposition at higher temperature. Various simple substance fused salts are mixed according to a certain proportion to form various novel mixed eutectic fused salts, and various flame points and fused salt media using a temperature zone can be obtained. The fused salt with wider application mainly comprises binary fused salt, ternary fused salt Hitec, hitecXL and the like. The molten salt adopted in the embodiment is binary molten salt, and the working temperature is 290-520 ℃.
The support tube 1 and the transition tube 2 are provided with cable joints 4, and one sides of the support tube 1 and the transition tube 2, which are positioned at the cable joints 4, are provided with cable holes 41, wherein the cable joints 4 are used for connecting a power supply. The terminal of the heating cable 5 is connected with the cable joint 4, the heating cable 5 is led into the heat collecting tube 3 through the cable hole 41 and extends along the axial direction of the heat collecting tube 3, and the sealing plug 6 is connected between the cable hole and the heating cable 5 in a sealing way. A heating cable 5 is respectively introduced from two ends of the heat collecting pipe 3, the length of the heating cable 5 in a thermal state is 1.1 times of the length in a cold state, and the two heating cables 5 are ensured not to be contacted with each other in the heat collecting pipe 3. In order to ensure the service life of the heating cable 5, it is necessary to control the meter power of the heating cable 5, ensure that the thermal load on the surface of the heating cable 5 cannot be excessive, generally the meter power of the heating cable 5 does not exceed 120w/m, and select the heat collecting tube 3 with the heat dissipation capacity lower than 120w/m (at 290 ℃).
The heat collecting pipe 3 is formed by connecting a plurality of sections, and the length is generally hundreds of meters, so that the heat collecting pipe 3 is supported through the supporting pipe 1.
The lower extreme of stay tube 1 is connected with the support frame, and the support frame includes bracing piece 71 and assembly plate 72, and the bottom of stay tube 1 is connected to the upper end fixed connection of bracing piece 71, and the lower extreme fixed connection assembly plate 72 of bracing piece 71.
The heating cable 5 is a double-core wire, the double-core wires at one end of the heating cable 5 are respectively connected with the cable connector 4, and the other end of the heating cable 5 is led into the heat collecting tube 3 through the cable hole 41 and extends along the axial direction of the heat collecting tube 3. In this way, only the other end of the heating cable 5 is required to extend into the heat collecting pipe 3 along the cable hole 41, and the assembly operation of the heating cable 5 is simplified.
The heating cable 5 is a mineral insulation heating cable with an outer diameter of 6mm-6.5mm, the core wire is made of nickel-chromium material, the outer sheath is made of metal (alloy 825), the wall thickness of the outer sheath is 0.6mm-0.65mm, and an insulation material (magnesium oxide) is filled between the core wire and the outer sheath. The heating cable 5 has little change of resistivity at high temperature, high mechanical strength, long service life, high temperature resistance, corrosion resistance and solar irradiation resistance.
As shown in fig. 5, a trough type solar collector comprises a tower 9 and the built-in electric tracing molten salt heat collecting tube assembly according to the embodiment, wherein a supporting tube 1 is assembled and mounted on the tower 9 through an assembling plate 72.
The built-in electric tracing fused salt heat collecting pipe assembly of the embodiment operates as follows:
1. preheating of heat collecting pipe 3
Before the heat collecting tube 3 is salted for the first time, the heat collecting tube 3 is preheated by the heating cable 5, the heat collecting tube 3 is preheated to 290 ℃, and when the preheating temperature reaches the target temperature, the salt feeding operation can be performed, so that the molten salt is ensured not to be condensed and blocked in the heat collecting tube 3.
2. Salt-filled maintenance heating
After the heat collecting tube 3 is filled with molten salt, the heating cable 5 can maintain the heat collecting tube 3 and the molten salt at the target temperature of 290 ℃, compensate the heat loss of the molten salt in the flowing process of the pipeline, and ensure that the molten salt cannot be condensed and blocked in the heat collecting tube 3.
3. Hollow tube maintenance heating
After the solar heat collecting tube 3 is emptied by molten salt after going down a mountain, the heating cable 5 can maintain the temperature of the heat collecting tube 3 and the pipeline at the target temperature of 290 ℃ so as to ensure that the heat collecting tube 3 can perform salt feeding work at any time the next day.
The present embodiment has been described in detail with reference to the accompanying drawings. From the foregoing description, those skilled in the art will clearly recognize that the present utility model is directed to a built-in electric tracing molten salt heat collecting tube assembly. The built-in electric tracing molten salt heat collecting pipe assembly is simple in assembly and installation operation, the arrangement and connection of the heating cable 5 are convenient and firm, the heating cable 5 is introduced into the heat collecting pipe 3, and electric heating of the inside of the heat collecting pipe 3 is achieved; the solar heat collector is applied to a trough type solar heat collector, preheating, full salt maintenance heating and empty pipe maintenance heating of the heat collecting pipe 3 can be realized, molten salt condensation is prevented from blocking the heat collecting pipe, condensation prevention of a molten salt medium heat collecting loop is effectively realized, solar radiation resources and condensation heat collecting time are occupied in the process of salt dredging, preheating and recharging of the heat collecting loop every day are avoided, operation and maintenance difficulty and cost are reduced, and the whole heat collecting system is safer and more reliable to operate.
Of course, the above-mentioned embodiments are only preferred embodiments of the present utility model, and not limiting the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model and should be protected by the present utility model.
Claims (8)
1. A built-in electric tracing fused salt heat collecting tube component is characterized in that,
the solar heat collector comprises a support tube, a transition tube, a heat collecting tube, a cable joint, a heating cable and a sealing plug;
the supporting tube, the transition tube and the heat collecting tube are hollow structures, and the heat collecting tube is internally filled with molten salt;
the two ends of the supporting tube are respectively connected with the heat collecting tube in series, the two ends of the transition tube are respectively connected with the heat collecting tube in series, and the supporting tube, the transition tube and the heat collecting tube are communicated;
the cable connector is arranged on the support tube and/or the transition tube and used for being connected with a power supply, and a cable hole is formed in one side of the cable connector on the support tube and/or the transition tube;
the wiring end of the heating cable is connected with the cable joint, and the heating cable is introduced into the heat collecting pipe through the cable hole and extends along the axial direction of the heat collecting pipe;
and the cable hole is in sealing connection with the heating cable, and the sealing plug is in sealing connection with the heating cable.
2. The built-in electric tracing molten salt heat collecting tube assembly of claim 1 wherein said heat collecting tube assembly comprises a heat pipe,
the lower extreme of stay tube is connected with the support frame.
3. The built-in electric tracing molten salt heat collecting tube assembly of claim 2, wherein the heat collecting tube assembly comprises a heat collecting tube,
the support frame includes bracing piece and assembly plate, the upper end fixed connection of bracing piece the bottom of stay tube, the lower extreme fixed connection of bracing piece the assembly plate.
4. The built-in electric tracing molten salt heat collecting tube assembly of claim 1 wherein said heat collecting tube assembly comprises a heat pipe,
the heating cable is a double-core wire, the double-core wires at one end of the heating cable are respectively connected with the cable connector, and the other end of the heating cable is led into the heat collecting pipe through the cable hole and extends along the axial direction of the heat collecting pipe.
5. The built-in electric tracing molten salt heat collecting tube assembly of claim 1 wherein said heat collecting tube assembly comprises a heat pipe,
the heating cable is provided as a mineral insulated heating cable.
6. The built-in electric tracing molten salt heat collecting tube assembly of claim 1 wherein said heat collecting tube assembly comprises a heat pipe,
the transition pipe is connected with the heat collecting pipe through a corrugated pipe.
7. The built-in electric tracing molten salt heat collecting tube assembly of claim 1 wherein said heat collecting tube assembly comprises a heat pipe,
the support tube and the transition tube are made of metal materials, and the heat collecting tube is made of glass materials.
8. A trough solar collector comprising a tower, further comprising the built-in electric tracing molten salt collector tube assembly of any one of claims 1 to 7, the support tube being disposed on the tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321048192.4U CN219829139U (en) | 2023-05-04 | 2023-05-04 | Built-in electric tracing fused salt heat collecting pipe assembly and groove type solar heat collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321048192.4U CN219829139U (en) | 2023-05-04 | 2023-05-04 | Built-in electric tracing fused salt heat collecting pipe assembly and groove type solar heat collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219829139U true CN219829139U (en) | 2023-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321048192.4U Active CN219829139U (en) | 2023-05-04 | 2023-05-04 | Built-in electric tracing fused salt heat collecting pipe assembly and groove type solar heat collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219829139U (en) |
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2023
- 2023-05-04 CN CN202321048192.4U patent/CN219829139U/en active Active
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