CN111981883B - Molten salt storage tank rapid preheating control method - Google Patents
Molten salt storage tank rapid preheating control method Download PDFInfo
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- CN111981883B CN111981883B CN202010758969.0A CN202010758969A CN111981883B CN 111981883 B CN111981883 B CN 111981883B CN 202010758969 A CN202010758969 A CN 202010758969A CN 111981883 B CN111981883 B CN 111981883B
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- storage tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a molten salt storage tank rapid preheating control method, when the maximum stress of a storage tank is smaller than the safety threshold of the allowable stress of the storage tank, when the preheating temperature difference is reduced to the preheating temperature difference threshold each time, the preheating inlet air temperature is increased by a first inlet air temperature increment, and the first inlet air temperature increment is gradually increased each time; when the maximum stress of the storage tank is larger than or equal to the safety threshold of the allowable stress of the storage tank, the preheating inlet air temperature is increased by a second inlet air temperature increment when the real-time temperature rising rate of the storage tank is reduced to the temperature rising rate threshold every time, and the second inlet air temperature increment is a fixed value. The invention can reasonably improve the preheating speed of the storage tank and shorten the preheating time of the storage tank on the premise of ensuring the safety of the storage tank.
Description
Technical Field
The invention relates to the technical field of solar heat storage, in particular to a molten salt storage tank rapid preheating control method.
Background
The molten salt is the first choice of the heat storage medium of the photo-thermal power station due to the advantages of low cost, large heat capacity, wide temperature range and the like, the working temperature of a common molten salt working medium is 290-565 ℃, and the heated molten salt is stored in the heat storage tank, so that the heat loss is reduced, and the aim of long-term heat storage is fulfilled.
As a core component of the heat storage system, the fused salt storage tank has a large volume and a thin tank wall, and if high-temperature fused salt is directly injected, thermal shock and thermal stress generated can damage the tank body, so that the service life of the storage tank is influenced. Therefore, before the heat storage system is restarted after being started for the first time or stopped for a long time, the molten salt storage tank is gradually preheated to a higher temperature from the ambient temperature, so that the thermal stress generated when molten salt is injected is reduced, and the method has very important significance for the safe and stable operation of the heat storage system.
At present, the fuel gas generated by burning external fuel is generally mixed with air to form preheated gas, and the preheated gas is introduced into a storage tank for preheating. In the preheating process, in order to keep the stress of the storage tank not to exceed the allowable stress, the preheating gas is generally kept at a fixed temperature difference with the storage tank, the preheating gas is injected into the tank in an equal-gradient heating mode, the whole preheating process generally lasts for about half a month, the heating rate is low, and the energy consumption is high. Therefore, how to shorten the preheating time of the storage tank on the premise of ensuring the safe operation of the device is a key problem to be solved urgently in the field of realization of rapid preheating.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a molten salt storage tank rapid preheating control method for rapidly realizing storage tank preheating on the premise of ensuring the safety of the storage tank.
In order to achieve the purpose, the invention provides a molten salt storage tank rapid preheating control method, when the maximum stress of a storage tank is smaller than a safe threshold of allowable stress of the storage tank, when the preheating temperature difference is reduced to the preheating temperature difference threshold each time, the preheating inlet air temperature is increased by a first inlet air temperature increment, and the first inlet air temperature increment is gradually increased each time; when the maximum stress of the storage tank is larger than or equal to the safety threshold of the allowable stress of the storage tank, the preheating inlet air temperature is increased by a second inlet air temperature increment when the real-time temperature rising rate of the storage tank is reduced to the temperature rising rate threshold every time, and the second inlet air temperature increment is a fixed value.
Further, the safety threshold of the allowable stress is the product of the allowable stress of the storage tank and a safety factor, and the value range of the safety factor is [0.6,0.8 ].
Further, the preheating temperature difference is the difference between the preheating inlet temperature of the preheating gas and the average temperature of the storage tank, and the average temperature of the storage tank is averaged by the temperature values of a plurality of temperature sensors uniformly distributed on the storage tank.
Further, the first intake air temperature increase is a series of equal differences that gradually increase.
Further, the first intake air temperature increase is greater than the second intake air temperature increase.
Further, when the average tank temperature reaches the preheating target temperature, the preheating is stopped.
The invention has the beneficial effects that: according to the invention, the preheating process of the molten salt storage tank is divided into two stages, the preheating inlet temperature is adjusted in the first stage according to the preheating temperature difference, so that the increment of the preheating inlet temperature after each adjustment is larger, the heating rate of the storage tank in the first stage is accelerated, and the preheating time of the storage tank is shortened; and the preheating inlet air temperature is adjusted according to the temperature rising rate of the storage tank in the second stage, so that the increasing amount of the preheating inlet air temperature is unchanged, and the safety of the storage tank is ensured.
Drawings
Fig. 1 is a graph showing changes in the average tank temperature and the preheated intake air temperature in this embodiment.
FIG. 2 is a graph showing the temperature increase rate of the storage tank in this embodiment.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1-2, a molten salt storage tank rapid preheating control method includes that before preheating, a plurality of temperature sensors and strain sensors are uniformly distributed on the surface of a storage tank, and the preheating inlet air temperature, the average storage tank temperature, the maximum storage tank strain and the real-time storage tank temperature rise speed of preheated gas are obtained in real time; the average temperature of the storage tank is averaged by temperature values of a plurality of temperature sensors uniformly distributed on the storage tank, and the maximum stress of the storage tank is the product of the maximum strain of the storage tank and the elastic modulus of a storage tank material.
When the maximum stress of the storage tank is less than 80% of the allowable stress of the storage tank, the first preheating stage is adopted, the stress risk of the storage tank is lower in the stage, and the mass flow of the preheated gas is set
As shown in fig. 1, the warm-up intake air temperature T at which warm-up startsinletAt 150 ℃ and the average temperature T of the storage tankaveThe temperature is 0 ℃, the preheating temperature difference is continuously reduced along with the continuous rise of the temperature of the storage tank, and after the storage tank is preheated for 5 hours, the preheating temperature difference is firstly reduced to a preheating temperature difference threshold value TsetAt 100 deg.C, the preheated inlet air temperature increases by a1Continuously preheating at 40-190 ℃; after the storage tank is preheated for 14.6 hours, the preheating temperature difference is reduced to the preheating temperature difference threshold value T for the second timesetAt 100 deg.C, the preheated inlet air temperature increases by a2Continuously preheating at 50-240 ℃; after the storage tank is preheated for 29.5 hours, the preheating temperature difference is reduced to the preheating temperature difference threshold T for the third timesetAt 100 deg.C, the preheated inlet air temperature increases by a3The preheating was continued at 60 to 300 ℃. Therefore, the heating rate of the storage tank is faster after each adjustment, the preheating time of the storage tank is shorter, and the sudden change stress of the storage tank cannot exceed the standard.
When the maximum stress of the storage tank is greater than or equal to 80% of the allowable stress of the storage tank, the temperature rise rate of the storage tank should be monitored in real time in the second preheating stage, where the risk of the stress of the storage tank is high. As shown in FIGS. 1-2, the real-time temperature rise rate V of the storage tank every timeTDown to the temperature rise rate threshold
The preheat inlet air temperature increases by 30 c each time. Therefore, the preheating inlet air temperature regulated at each time is not increased too much, the maximum stress of the storage tank is maintained within the range of less than the allowable stress, the maximum stress of the storage tank is prevented from being greater than the allowable stress of the storage tank when the average temperature of the storage tank does not reach the preheating target temperature, and the safety of the storage tank is ensured.
And when the average temperature of the storage tank reaches the preheating target temperature of 380 ℃, stopping preheating and conveying the molten salt into the molten salt storage tank.
Claims (5)
1. A molten salt storage tank rapid preheating control method is characterized in that: when the maximum stress of the storage tank is smaller than the safe threshold of the allowable stress of the storage tank, increasing the preheating inlet air temperature by a first inlet air temperature increment each time when the preheating temperature difference is reduced to the preheating temperature difference threshold, wherein the preheating temperature difference is the difference between the preheating inlet air temperature of the preheating gas and the average temperature of the storage tank, and the average temperature of the storage tank is averaged by the temperature values of a plurality of temperature sensors uniformly distributed on the storage tank; when the maximum stress of the storage tank is larger than or equal to the safety threshold of the allowable stress of the storage tank, the preheating inlet air temperature is increased by a second inlet air temperature increment when the real-time temperature rising rate of the storage tank is reduced to the temperature rising rate threshold every time, and the second inlet air temperature increment is a fixed value.
2. The molten salt storage tank rapid preheating control method according to claim 1, characterized in that: the safety threshold value of the allowable stress is the product of the allowable stress of the storage tank and a safety coefficient, and the value range of the safety coefficient is [0.6,0.8 ].
3. The molten salt storage tank rapid preheating control method according to claim 1, characterized in that: the first intake air temperature increase is a series of equal differences that gradually increase.
4. The molten salt storage tank rapid preheating control method according to claim 1, characterized in that: the first intake air temperature increase is greater than the second intake air temperature increase.
5. The molten salt storage tank rapid preheating control method according to claim 1, characterized in that: and when the average temperature of the storage tank reaches the preheating target temperature, stopping preheating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010758969.0A CN111981883B (en) | 2020-07-31 | 2020-07-31 | Molten salt storage tank rapid preheating control method |
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| CN202010758969.0A CN111981883B (en) | 2020-07-31 | 2020-07-31 | Molten salt storage tank rapid preheating control method |
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| CN111981883A CN111981883A (en) | 2020-11-24 |
| CN111981883B true CN111981883B (en) | 2021-12-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4146444A (en) * | 1978-04-10 | 1979-03-27 | Aluminum Company Of America | Method for preheating a molten salt electrolysis cell |
| CN107555003A (en) * | 2017-05-10 | 2018-01-09 | 杭州锅炉集团股份有限公司 | A kind of salt storage tank preheating and heater |
| CN110319606A (en) * | 2019-06-06 | 2019-10-11 | 山东电力建设第三工程有限公司 | Photo-thermal power station heat reservoir fused salt tank pre-heating mean |
| CN110486958A (en) * | 2019-06-06 | 2019-11-22 | 山东电力建设第三工程有限公司 | Slot type photo-thermal power station fused salt injection technology |
| CN210235962U (en) * | 2019-05-16 | 2020-04-03 | 湖北省电力勘测设计院有限公司 | Solar photo-thermal power generation molten salt storage tank preheating system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014202633B4 (en) * | 2014-02-13 | 2021-07-15 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Process for operating a solar thermal power plant as well as a solar thermal power plant |
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2020
- 2020-07-31 CN CN202010758969.0A patent/CN111981883B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4146444A (en) * | 1978-04-10 | 1979-03-27 | Aluminum Company Of America | Method for preheating a molten salt electrolysis cell |
| CN107555003A (en) * | 2017-05-10 | 2018-01-09 | 杭州锅炉集团股份有限公司 | A kind of salt storage tank preheating and heater |
| CN210235962U (en) * | 2019-05-16 | 2020-04-03 | 湖北省电力勘测设计院有限公司 | Solar photo-thermal power generation molten salt storage tank preheating system |
| CN110319606A (en) * | 2019-06-06 | 2019-10-11 | 山东电力建设第三工程有限公司 | Photo-thermal power station heat reservoir fused salt tank pre-heating mean |
| CN110486958A (en) * | 2019-06-06 | 2019-11-22 | 山东电力建设第三工程有限公司 | Slot type photo-thermal power station fused salt injection technology |
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| CN111981883A (en) | 2020-11-24 |
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Address after: 430040 1 new bridge four, Jin Yin Hu Street, Dongxihu District, Wuhan, Hubei Patentee after: Hubei Electric Power Planning, Design and Research Institute Co.,Ltd. Address before: 430040 1 new bridge four, Jin Yin Hu Street, Dongxihu District, Wuhan, Hubei Patentee before: POWERCHINA HUBEI ELECTRIC ENGINEERING Corp.,Ltd. |
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