CN221570537U - High-power fused salt electric heating system - Google Patents
High-power fused salt electric heating system Download PDFInfo
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- CN221570537U CN221570537U CN202420474329.0U CN202420474329U CN221570537U CN 221570537 U CN221570537 U CN 221570537U CN 202420474329 U CN202420474329 U CN 202420474329U CN 221570537 U CN221570537 U CN 221570537U
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- 150000003839 salts Chemical class 0.000 title claims abstract description 159
- 238000005485 electric heating Methods 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000004146 energy storage Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005338 heat storage Methods 0.000 abstract description 9
- 238000000354 decomposition reaction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model relates to a high-power molten salt electric heating system, which comprises a hot salt tank, a cold salt tank and a molten salt conveying pipeline for connecting the hot salt tank and the cold salt tank, wherein one side of the molten salt conveying pipeline, which is communicated with the cold salt tank, is a low-temperature section, and one side, which is communicated with the hot salt tank, is a high-temperature section; the low temperature Duan Peizhi is provided with a first molten salt heating group, and the high temperature section is provided with a second molten salt heating group; the first molten salt heating group is composed of a plurality of low-temperature electric heaters which are connected in parallel. The high-power fused salt electric heating system designed by the utility model can provide sufficient heating power by adopting the design that the low-temperature Duan Gao power electric heater is connected in parallel with the high-temperature section low-power electric heater in series and the combined control of the electric contactor and the controllable silicon, thereby meeting the requirement of large-scale rapid heat storage, accurately controlling the fused salt temperature, preventing the fused salt from overheat decomposition and ensuring the safety of the heat storage process.
Description
Technical Field
The utility model relates to the technical field of molten salt heat storage, in particular to a high-power molten salt electric heating system.
Background
In the prior art, with the strong development of national wind power and photoelectric power, wind energy and light energy power generation has the influence of weather and weather day and night, the impact on a power grid in China is large, and meanwhile, the time difference exists between the power generation side and the user side of power consumption in the society, so that a large amount of energy is wasted. Therefore, the energy storage or the heat storage is urgently needed to balance the generated energy and the used energy, when the generated energy is larger than the used energy, the electric energy and the used heat energy are stored in the fused salt, when the used energy or the used steam is used, the heat in the fused salt is released, and the heat is supplied to a heat user or the heat steam is generated through heat exchange to drive the steam turbine to generate electricity.
In electric molten salt energy storage, a large amount of electric energy needs to be converted into heat energy of molten salt, however, the existing electric heater technology has limitation on power, cannot meet the requirement of large-scale energy storage, in addition, molten salt is easy to decompose at high temperature, especially under the condition of small flow of molten salt, if the power of a heater is too high, abnormal rising of the temperature of the molten salt can be caused, and molten salt decomposition is initiated, so that equipment such as a molten salt pipeline, a valve and a storage tank can be damaged, the service life of the equipment can be shortened, and the structural safety of the whole system is influenced. Therefore, developing a molten salt heating system capable of precisely controlling heating power in a high temperature section is important for improving energy storage efficiency and ensuring system safety.
Disclosure of Invention
In order to solve the problems, the utility model provides a high-power molten salt electric heating system which can provide sufficient heating power, meet the requirement of large-scale rapid heat storage, accurately control the temperature of molten salt and prevent the overheat decomposition of the molten salt.
In order to achieve the purpose, the high-power fused salt electric heating system is used for heat energy conversion in an energy storage system and comprises a hot salt tank, a cold salt tank and a fused salt conveying pipeline for connecting the hot salt tank and the cold salt tank, wherein one side of the fused salt conveying pipeline, which is communicated with the cold salt tank, is a low-temperature section, and one side, which is communicated with the hot salt tank, is a high-temperature section; the low temperature Duan Peizhi is provided with a first molten salt heating group, and the high temperature section is provided with a second molten salt heating group; the first molten salt heating group consists of a plurality of low-temperature electric heaters which are connected in parallel, and when the molten salt is at a low temperature Duan Jiare, the low-temperature electric heaters are controlled to be on-off through a fully-closed and fully-opened electric contactor; the second molten salt heating group consists of a plurality of high-temperature electric heaters which are connected in series, and when the molten salt is heated in a high-temperature section, the high-temperature electric heaters perform power regulation control through a silicon controlled rectifier; the rated power of the low-temperature electric heater is higher than that of the high-temperature electric heater.
In order to simply and effectively realize the accurate control of the power of the high-temperature electric heater, the system also comprises a DCS control system and temperature measuring points for sending temperature signals to the DCS control system, wherein the temperature measuring points comprise outlet temperature measuring points arranged at outlets of the first molten salt heating group and the second molten salt heating group and over-temperature protection measuring points arranged inside each low-temperature electric heater and each high-temperature electric heater; when the DCS control system receives that the temperature signal of any outlet temperature measuring point is higher than a preset threshold, cutting off the power supply of the corresponding first molten salt heating group or second molten salt heating group; when the temperature signal of any one of the overtemperature protection measuring points is higher than a preset threshold value, the DCS control system cuts off the power supply of a single corresponding low-temperature electric heater or high-temperature electric heater; the DCS control system is also used for adjusting the conduction rate of the silicon controlled rectifier according to the temperature signal of the over-temperature protection measuring point so as to control the power of the high-temperature electric heater.
In order to meet the requirements of high-power fused salt electric heaters, a power distribution system of the fused salt electric heating system adopts a transformer combination formed by six 0.69kV transformers and two 0.69kV transformers.
In order to avoid overheating or underheating, each transformer is provided with a 690V inlet wire cabinet and two power regulating cabinets, the 690V inlet wire cabinets are used for receiving and distributing electric energy to power supply loops of the high-temperature electric heater and the low-temperature electric heater, and the power regulating cabinets are used for regulating and controlling power output of the high-temperature electric heater and the low-temperature electric heater.
In order to improve the control precision, energy efficiency and reliability of the fused salt electric heating system, the proportion of a silicon controlled rectifier control loop in a control loop of the power distribution system is 25%.
In order to optimize heating efficiency, the outlet of the second molten salt heating group is further provided with a molten salt flow measuring point, and the DCS control system is further used for controlling molten salt flow in the molten salt conveying pipeline according to flow signals sent by the molten salt flow measuring point.
The high-power fused salt electric heating system designed by the utility model can provide sufficient heating power by adopting the design that the low-temperature Duan Gao power electric heater is connected in parallel with the high-temperature section low-power electric heater in series and the combined control of the electric contactor and the controllable silicon, thereby meeting the requirement of large-scale rapid heat storage, accurately controlling the fused salt temperature, preventing the fused salt from overheat decomposition and ensuring the safety of the heat storage process. Meanwhile, the double temperature control system realizes real-time monitoring and overheat protection of molten salt temperature, so that the whole system can safely and stably operate.
Drawings
Fig. 1 is a schematic plan view of embodiment 1;
FIG. 2 is a schematic diagram of the wiring of the power distribution system of example 1;
FIG. 3 is a schematic diagram of a thyristor in example 1;
Fig. 4 is a control diagram of the silicon controlled rectifier in example 1.
Wherein: the device comprises a hot salt tank 10, a cold salt tank 20, a molten salt conveying pipeline 30, a low-temperature section 31, a high-temperature section 32, a first molten salt heating group 40, a low-temperature electric heater 41, a second molten salt heating group 50, a high-temperature electric heater 51, an outlet temperature measuring point 60, an overtemperature protection measuring point 70, a salt pump 80, a molten salt flow measuring point 90 and a silicon controlled rectifier 100.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Example 1.
As shown in fig. 1, the high-power molten salt electric heating system described in this embodiment is used for heat energy conversion in an energy storage system, and includes a hot salt tank 10, a cold salt tank 20, and a molten salt conveying pipeline 30 connecting the hot salt tank 10 and the cold salt tank 20, wherein one side of the molten salt conveying pipeline 30, which is communicated with the cold salt tank 20, is a low-temperature section 31, and one side, which is communicated with the hot salt tank 10, is a high-temperature section 32; the low temperature section 31 is provided with a first molten salt heating group 40, and the high temperature section 32 is provided with a second molten salt heating group 50; the first molten salt heating group 40 is composed of a plurality of low-temperature electric heaters 41 connected in parallel, and when the low-temperature section 31 heats molten salt, the low-temperature electric heaters 41 are controlled to be on-off by a fully-closed and fully-opened electric contactor; the second molten salt heating group 50 is composed of a plurality of high-temperature electric heaters 51 connected in series, and when the high-temperature section 32 heats molten salt, the high-temperature electric heaters 51 perform power adjustment control through the silicon controlled rectifier 100; wherein, the rated power of the low-temperature electric heater 41 is higher than that of the high-temperature electric heater 51.
In specific implementation, as shown in the figure, when the system is started, molten salt in the cold salt tank 20 is pumped into the molten salt conveying pipeline 30 through the salt pump 80, the molten salt passes through two main heating areas of the low-temperature section 31 and the high-temperature section 32 in the process that the molten salt conveying pipeline 30 flows to the hot salt tank 10, in the low-temperature section 31, as the temperature of the molten salt is far lower than the decomposition temperature of the molten salt, the system utilizes the high-power low-temperature electric heater 41 to heat, the two low-temperature electric heaters 41 can be connected in series to form a group, and then the two groups are connected in parallel to form a first molten salt heating group 40, and rapid heating is realized in a fully-closed and fully-open control mode of an electric contactor, so that the high-power heating requirement of the low-temperature section 31 is met; then, the molten salt continues to flow to the high temperature section 32, where the second molten salt heating group 50 takes over the heating task, which in this embodiment consists of four high temperature electric heaters 51 in series, each high temperature electric heater 51 being fine power-adjusted by means of a separate thyristor 100, this control strategy ensuring that the molten salt temperature of the high temperature section 32 is accurately controlled, preventing decomposition of the molten salt due to overheating.
Specifically, for simply and effectively realizing accurate control of the power of the high-temperature electric heater 51, the system further comprises a DCS control system and temperature measuring points for sending temperature signals to the DCS control system, wherein the temperature measuring points comprise outlet temperature measuring points 60 (generally temperature sensors) arranged at the outlets of the first molten salt heating group 40 and the second molten salt heating group 50, and over-temperature protection measuring points 70 (generally temperature sensors) arranged inside each of the low-temperature electric heater 41 and the high-temperature electric heater 51; when the temperature signal of any outlet temperature measuring point 60 is higher than a preset threshold value, the DCS control system cuts off the power supply of the corresponding first molten salt heating group 40 or second molten salt heating group 50; when the temperature signal of any one of the overtemperature protection measuring points 70 is higher than a preset threshold value, the DCS control system cuts off the power supply of the single corresponding low-temperature electric heater 41 or high-temperature electric heater 51; the DCS control system is further configured to adjust the conduction rate of the scr 100 according to the temperature signal of the overtemperature protection measurement point 70, so as to control the power of the high-temperature electric heater 51.
During operation, the temperature measuring point sends detected temperature signals to a DCS control system (not shown), the DCS control system controls the operation states of the first molten salt heating group 40 and the second molten salt heating group 50 according to the signals, wherein when the DCS control system detects that the temperature of any outlet temperature measuring point 60 exceeds a preset safety threshold, the system automatically cuts off the power supply of the corresponding heating group (40, 50) to prevent the molten salt from overheating, and also cuts off the power supply of the corresponding heater (41, 51) to prevent the molten salt from decomposing due to continuous heating of the heater, and in addition, the DCS control system adjusts the conduction rate of the silicon controlled rectifier 100 according to the temperature signals of the over-temperature protecting measuring point 70, which allows the system to finely adjust the power output of the high-temperature electric heater 51 on the premise of ensuring safety (the molten salt temperature does not exceed the melting threshold) so as to adapt to different heating requirements.
The thyristor control loop comprises a plastic shell breaker 1, a fused salt electric heater 3, a miniature breaker 4, a miniature breaker 5, an isolation transformer 6, a change-over switch 7, a start button 8, a stop button 9, an intermediate relay 12 and a DCS control 11, as shown in fig. 3 and 3, the main power supply loop is powered by the plastic shell breaker 1 and the thyristor 100 to the heaters (41 and 51), wherein the control loop obtains a control power supply through the isolation transformer 6, the thyristor 100 is started after the coil of the intermediate relay 10 is electrified, 4-20 mA signals are output in the DCS control 11, and the 4-20 mA signals are fed into a thyristor trigger plate, so that the heating power is controlled by the thyristor trigger plate to dynamically adjust the power output of each high-temperature electric heater 51, thereby not only avoiding fused salt decomposition caused by overheating, but also reducing the high-order harmonic pollution generated by the main loop of the thyristor, simultaneously reducing the impact on a power grid in the instant, and improving the energy efficiency of the whole system and the stability of the power grid.
In this embodiment, in order to meet the requirement of the high-power molten salt electric heater, the power distribution system of the molten salt electric heating system adopts a transformer combination formed by six 0.69kV transformers and two 0.69kV transformers together. Thus, when the system is started, the high voltage of the power grid is reduced to 0.69kV so as to meet the voltage requirement of the fused salt electric heater. In addition, in the implementation, the 8 high-power transformers can be arranged above the electric heater building in a concentrated mode, so that maintenance personnel can conveniently conduct daily inspection and maintenance work, and meanwhile, some supporting structures and facilities can be shared, so that construction cost of buildings and infrastructure is reduced.
Specifically, each transformer is provided with a 690V inlet wire cabinet and two power regulating cabinets, the 690V inlet wire cabinets are used for receiving and distributing electric energy to the power supply loops of the high-temperature electric heater 51 and the low-temperature electric heater 41, and the power regulating cabinets are used for regulating and controlling the power output of the high-temperature electric heater 51 and the low-temperature electric heater 41. When the system is started, electric energy enters the power regulating cabinet through the wire inlet cabinet, and the power regulating cabinet regulates the conduction rate of the silicon controlled rectifier 100 according to feedback of the DCS control system, such as data of temperature measuring points, so that the power of the high-temperature electric heater 51 is accurately controlled, the temperature control of molten salt in the heating process of the high-temperature section 32 is ensured, and the overheat condition is avoided. Meanwhile, through the dispersed load, the operation pressure of a single transformer is reduced, and the safety of the system is improved.
In this embodiment, in order to improve the control accuracy, energy efficiency and reliability of the molten salt electric heating system, in the control loop of the power distribution system, the duty ratio of the silicon controlled rectifier control loop is 25%. In this way, the contactor is used to provide a stable current when the low temperature electric heater 41 needs to operate at full power, while the thyristor 100 is used to fine-tune the power output when the high temperature electric heater 51 heats, especially when the molten salt approaches the target temperature, the thyristor control loop intervenes to fine-control the power output by adjusting its conductivity, ensuring the stability of the molten salt temperature, and the 25% duty cycle of the thyristor control loop is a trade-off between energy efficiency and cost.
In this embodiment, in order to optimize the heating efficiency, the outlet of the second molten salt heating group 50 is further provided with a molten salt flow measurement point 90 (typically, a flow sensor), and the DCS control system is further configured to control the flow of molten salt in the molten salt conveying pipeline 30 according to the flow signal sent by the molten salt flow measurement point 90. In this embodiment, the DCS control system may automatically adjust the valves or pumps in the molten salt delivery pipe 30 according to the flow data and preset different heating strategies, so as to control the flow of the molten salt, ensure the operation of the heaters (41, 51) in an optimal state, and avoid the waste of energy due to excessive flow or insufficient heating due to insufficient flow.
According to the high-power fused salt electric heating system provided by the embodiment, through the design that the low-temperature Duan Gao power electric heater is connected in parallel with the high-temperature section low-power electric heater in series and the combined control of the electric contactor and the silicon controlled rectifier, sufficient heating power can be provided, the requirement of large-scale rapid heat storage is met, the fused salt temperature can be accurately controlled, the fused salt is prevented from being overheated and decomposed, and the safety of the heat storage process is ensured. Meanwhile, the double temperature control system realizes real-time monitoring and overheat protection of molten salt temperature, so that the whole system can safely and stably operate.
In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. 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.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The high-power fused salt electric heating system is used for heat energy conversion in an energy storage system and comprises a hot salt tank (10), a cold salt tank (20) and a fused salt conveying pipeline (30) for connecting the hot salt tank (10) and the cold salt tank (20), and is characterized in that one side of the fused salt conveying pipeline (30) communicated with the cold salt tank (20) is a low-temperature section (31), and one side of the fused salt conveying pipeline communicated with the hot salt tank (10) is a high-temperature section (32); the low temperature section (31) is provided with a first molten salt heating group (40), and the high temperature section (32) is provided with a second molten salt heating group (50); the first molten salt heating group (40) consists of a plurality of low-temperature electric heaters (41) which are connected in parallel, and when the molten salt is heated in the low-temperature section (31), the low-temperature electric heaters (41) are controlled to be on-off through a fully-closed and fully-opened electric contactor; the second molten salt heating group (50) consists of a plurality of high-temperature electric heaters (51) which are connected in series, and when the molten salt is heated by the high-temperature section (32), the high-temperature electric heaters (51) perform power regulation control through a silicon controlled rectifier (100); wherein the rated power of the low-temperature electric heater (41) is higher than the rated power of the high-temperature electric heater (51).
2. The high-power molten salt electric heating system according to claim 1, further comprising a DCS control system and temperature measuring points that send temperature signals to the DCS control system, the temperature measuring points including outlet temperature measuring points (60) provided at the outlets of the first molten salt heating group (40) and the second molten salt heating group (50), and over-temperature protection measuring points (70) provided inside each of the low-temperature electric heater (41) and the high-temperature electric heater (51); when the temperature signal of any outlet temperature measuring point (60) is received and is higher than a preset threshold value, the DCS control system cuts off the power supply of the corresponding first molten salt heating group (40) or second molten salt heating group (50); when the temperature signal of any one of the overtemperature protection measuring points (70) is received by the DCS control system to be higher than a preset threshold value, the power supply of a single corresponding low-temperature electric heater (41) or high-temperature electric heater (51) is cut off; the DCS control system is also used for adjusting the conductivity of the silicon controlled rectifier (100) according to the temperature signal of the over-temperature protection measuring point (70) so as to control the power of the high-temperature electric heater (51).
3. The high power molten salt electric heating system of claim 1 or 2, wherein the power distribution system of the molten salt electric heating system adopts a transformer combination formed by six 0.69kV transformers and two 0.69kV transformers.
4. A high power molten salt electric heating system as claimed in claim 3 wherein each transformer is provided with a 690V inlet wire cabinet for receiving and distributing electrical energy to the power supply circuits of the high temperature electric heater (51) and the low temperature electric heater (41) and two power regulating cabinets for regulating and controlling the power output of the high temperature electric heater (51) and the low temperature electric heater (41).
5. A high power molten salt electric heating system as claimed in claim 3 wherein the silicon controlled control loop of the power distribution system has a 25% duty cycle.
6. The high-power molten salt electric heating system according to claim 2, characterized in that the outlet of the second molten salt heating group (50) is further provided with a molten salt flow measuring point (90), and the DCS control system is further configured to control the flow of molten salt in the molten salt conveying pipeline (30) according to a flow signal sent by the molten salt flow measuring point (90).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420474329.0U CN221570537U (en) | 2024-03-12 | 2024-03-12 | High-power fused salt electric heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420474329.0U CN221570537U (en) | 2024-03-12 | 2024-03-12 | High-power fused salt electric heating system |
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| CN221570537U true CN221570537U (en) | 2024-08-20 |
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| CN202420474329.0U Active CN221570537U (en) | 2024-03-12 | 2024-03-12 | High-power fused salt electric heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119617936A (en) * | 2024-12-19 | 2025-03-14 | 中国科学院电工研究所 | Array fused salt electric heating energy storage system |
| CN119779389A (en) * | 2024-12-19 | 2025-04-08 | 山东千源多品种盐业有限公司 | Hot compress salt physiotherapy package safety test method |
-
2024
- 2024-03-12 CN CN202420474329.0U patent/CN221570537U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119617936A (en) * | 2024-12-19 | 2025-03-14 | 中国科学院电工研究所 | Array fused salt electric heating energy storage system |
| CN119779389A (en) * | 2024-12-19 | 2025-04-08 | 山东千源多品种盐业有限公司 | Hot compress salt physiotherapy package safety test method |
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