CN114166887A - An experimental platform for testing the thickness of the thermocline layer in a single-tank thermal storage system of molten salt - Google Patents

An experimental platform for testing the thickness of the thermocline layer in a single-tank thermal storage system of molten salt Download PDF

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CN114166887A
CN114166887A CN202210131676.9A CN202210131676A CN114166887A CN 114166887 A CN114166887 A CN 114166887A CN 202210131676 A CN202210131676 A CN 202210131676A CN 114166887 A CN114166887 A CN 114166887A
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molten salt
temperature
storage tank
heat storage
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CN114166887B (en
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郝芸
黄晶晶
朱端银
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Xian Shiyou University
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    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • GPHYSICS
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Abstract

The invention discloses a test experiment platform for the thickness of an inclined temperature layer of a fused salt single-tank heat storage system, which comprises the following components: the heat storage tank is used for storing high-temperature and low-temperature molten salt at the same time, and the middle part of the heat storage tank is an inclined temperature layer area; the low-temperature inlet of the preheater is connected with the low-temperature molten salt outlet at the bottom end of the heat storage tank through a low-temperature molten salt pump; the molten salt storage tank is internally provided with an electric heating mechanism, an inlet at the lower end of the molten salt storage tank is connected with a low-temperature outlet of the preheater, an outlet at the upper end of the molten salt storage tank is also connected with a high-temperature inlet of the preheater, and a high-temperature outlet of the preheater is also connected with a high-temperature molten salt inlet at the top end of the heat storage tank; the high temperature entry of heat exchanger passes through high temperature fused salt pump and the high temperature fused salt exit linkage on heat accumulation jar top, and the heat exchanger both sides still are equipped with cooling water entry and cooling water export respectively, through cooling water and the heat transfer of high temperature fused salt, the low temperature export of heat exchanger still with the entry linkage of fused salt storage tank lower extreme.

Description

Test experiment platform for thickness of thermocline of fused salt single-tank heat storage system
Technical Field
The invention belongs to the technical field of research of heat storage systems, and particularly relates to a test experiment platform for the thickness of an inclined temperature layer of a molten salt single-tank heat storage system.
Background
The fused salt single-tank heat storage system adopts a heat storage tank to store heat, high-temperature fused salt is arranged at the upper part of the heat storage tank, and low-temperature fused salt is arranged at the lower part of the heat storage tank. When heat is released, low-temperature molten salt enters the tank from the bottom of the tank through a low-temperature molten salt pump, and meanwhile, high-temperature molten salt is pumped out from the top of the tank to heat working media; during heat storage, high-temperature molten salt enters the tank from the top of the tank through a high-temperature molten salt pump, and low-temperature molten salt is pumped out from the bottom of the tank and is reheated. Because a layer with a large temperature gradient is formed in a contact area of the high-temperature molten salt and the low-temperature molten salt due to density difference caused by temperature difference of the high-temperature molten salt and the low-temperature molten salt in the heat storage tank and the flowing action of the molten salt, the layer is called as an inclined temperature layer, and therefore the heat storage tank of the molten salt single-tank heat storage system is also called as an inclined temperature layer heat storage tank. The thermocline is an important parameter for evaluating the working performance of the single-tank heat storage system, and the stability and the thickness of the thermocline directly determine the efficiency of the whole heat storage system, so that the efficiency of the whole power generation system is influenced. At present, no special measuring platform exists for the thickness measurement of the thermocline.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a test experiment platform for the thickness of the thermocline of the fused salt single-tank heat storage system, which is used for researching the thickness of the thermocline in the fused salt single-tank heat storage system, the change rule of the thermocline under different working conditions and the change of the thermal stress of the cold-hot fluid circularly and alternately entering and exiting the lower thermocline heat storage tank in the heat storage and release process, so that the efficient and safe operation of the heat storage system is ensured.
The technical scheme of the invention is as follows: a test experiment platform of thickness of thermocline layer of fused salt single-tank heat storage system includes:
the heat storage tank is internally provided with high-temperature molten salt at the upper part, low-temperature molten salt at the lower part and a thermocline region between the high-temperature molten salt and the low-temperature molten salt;
the low-temperature inlet of the preheater is connected with the low-temperature molten salt outlet at the bottom end of the heat storage tank through a low-temperature molten salt pump and is used for conveying the low-temperature molten salt to the preheater for heat exchange;
the molten salt storage tank is internally provided with an electric heating mechanism, an inlet at the lower end of the molten salt storage tank is connected with a low-temperature outlet of the preheater and used for conveying low-temperature molten salt subjected to heat exchange by the preheater into the molten salt storage tank to be heated by the electric heating mechanism, an outlet at the upper end of the molten salt storage tank is also connected with a high-temperature inlet of the preheater, and a high-temperature outlet of the preheater is also connected with a high-temperature molten salt inlet at the top end of the heat storage tank and used for conveying the heated high-temperature molten salt to the upper part of the heat storage tank;
the high-temperature inlet of the heat exchanger is connected with the high-temperature fused salt outlet at the top end of the heat storage tank through a high-temperature fused salt pump, the two sides of the heat exchanger are respectively provided with a cooling water inlet and a cooling water outlet, heat exchange is carried out on the high-temperature fused salt through cooling water, and the low-temperature outlet of the heat exchanger is connected with the inlet at the lower end of the fused salt storage tank.
Furthermore, porous media are filled in the heat storage tank above the thermocline area and the heat storage tank below the thermocline area.
Further, thirteen pairs of thermocouples are uniformly arranged on the outer side of the heat storage tank in a spiral mode, and a graduated scale for measuring the height is arranged on the outer side of the heat storage tank.
And further, thirteen pairs of thermocouples are arranged in a layered mode, and a pair of thermocouples is symmetrically arranged on each layer and used for better measuring the temperature change rule.
Furthermore, a high-temperature filtering and flow dispersing plate is arranged in the heat storage tank and close to the high-temperature molten salt inlet.
Furthermore, a low-temperature filtering and flow dispersing plate is arranged in the heat storage tank and close to the low-temperature molten salt outlet.
Further, the electric heating mechanism includes an electric heater provided inside the molten salt storage tank and a power supply device provided outside the molten salt storage tank, the power supply device being connected to the electric heater.
The working method of the invention comprises the following steps: the low-temperature molten salt at the lower part of the heat storage tank is sent to the preheater through a low-temperature inlet of the preheater by a low-temperature molten salt pump, enters the molten salt storage tank through a low-temperature outlet of the preheater after exchanging heat with the high-temperature molten salt in the preheater, is further heated by an electric heating mechanism in the molten salt storage tank, enters the preheater through a high-temperature inlet of the preheater after the temperature reaches a set temperature, then enters the upper part of the heat storage tank from the high-temperature molten salt inlet of the heat storage tank through a high-temperature outlet of the preheater, the upper part of the heat storage tank is the high-temperature molten salt, the lower part of the heat storage tank is the low-temperature molten salt, the middle part of the heat storage tank is an inclined temperature layer area, and the heat storage tank is filled with porous media, so that the fluidity and the heat transfer area of the molten salt are increased, when an inclined temperature layer thickness test experiment of a molten salt single molten salt tank heat storage system is carried out, the high-temperature molten salt is sent to the heat exchanger from the high-temperature molten salt outlet at the top end of the heat storage tank through the high-temperature molten salt pump to exchange with cooling water, the temperature change rule of the thermocline region in the heat release process is researched by the thermocouple, the highest temperature and the lowest temperature of the thermocline region are determined according to the inlet temperatures of the high-temperature fused salt and the low-temperature fused salt of the heat storage tank, the temperature measured by the thermocouple arranged in the heat storage tank is matched with the temperature measured by the thermocouple, the error between the temperature measured by the thermocouple and the temperature measured by the thermocouple reaches the test requirement, the thermocline region is considered to be stable, and the thickness of the thermocline region can be obtained by combining with the corresponding height calibrated outside the heat storage tank.
Compared with the prior art, the invention has the beneficial effects that: the solid material filled in the molten salt single-tank heat storage system is very low in price compared with molten salt, so that the construction cost of the heat storage system is reduced; and one heat storage tank is reduced in the single-tank heat storage system, and meanwhile, related auxiliary equipment such as valves, pipelines, heat exchangers and the like are also reduced, so that the overall construction cost of the single-tank heat storage system is far lower than that of a double-tank system. The invention can lead the fused salt single-tank heat storage system to have huge application potential in future advanced photo-thermal power stations.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the heat storage tank of the present invention;
FIG. 3 is a top view of a heat storage tank of the present invention;
FIG. 4 is a thermocouple distribution plot of the present invention.
The system comprises a heat storage tank 1, a porous medium 11, an inclined temperature layer region 12, a low-temperature molten salt outlet 13, a high-temperature molten salt inlet 14, a high-temperature molten salt outlet 15, a thermocouple 16, a high-temperature filtering and flow dispersing plate 17, a low-temperature filtering and flow dispersing plate 18, a preheater 2, a low-temperature molten salt pump 3, a molten salt storage tank 4, an electric heating mechanism 41, an electric heater 411, a power supply device 412, a heat exchanger 5, a cooling water inlet 51, a cooling water outlet 52 and a high-temperature molten salt pump 6.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Example (b): as shown in fig. 1, the test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system comprises:
as shown in fig. 2-4, the heat storage tank 1 is filled with a porous medium 11, the upper part in the heat storage tank 1 is high-temperature molten salt, the lower part in the heat storage tank 1 is low-temperature molten salt, an inclined temperature layer region 12 is arranged between the high-temperature molten salt and the low-temperature molten salt, thirteen pairs of thermocouples 16 are uniformly arranged on the outer side of the heat storage tank 1 in a spiral manner, a graduated scale for measuring height is arranged on the outer side of the heat storage tank 1, the thirteen pairs of thermocouples 16 are arranged in layers, and a pair of thermocouples 16 is symmetrically arranged on each layer for better measuring the temperature change rule;
the low-temperature inlet of the preheater 2 is connected with the low-temperature molten salt outlet 13 at the bottom end of the heat storage tank 1 through the low-temperature molten salt pump 3 and is used for conveying the low-temperature molten salt into the preheater 2 for heat exchange, and the low-temperature filtering and diffusing plate 18 is arranged in the heat storage tank 1 and close to the low-temperature molten salt outlet 13;
the molten salt storage tank 4 is provided with an electric heating mechanism 41 in the molten salt storage tank 4, the electric heating mechanism 41 comprises an electric heater 411 arranged in the molten salt storage tank 4 and a power supply device 412 arranged outside the molten salt storage tank 4, the power supply device 412 is connected with the electric heater 411, an inlet at the lower end of the molten salt storage tank 4 is connected with a low-temperature outlet of the preheater 2 and used for conveying low-temperature molten salt subjected to heat exchange by the preheater 2 to the molten salt storage tank 4 and heating by the electric heating mechanism 41, an outlet at the upper end of the molten salt storage tank 4 is also connected with a high-temperature inlet of the preheater 2, a high-temperature outlet of the preheater 2 is also connected with a high-temperature molten salt inlet 14 at the top end of the heat storage tank 1 and used for conveying heated high-temperature molten salt to the upper part of the heat storage tank 1, and a high-temperature filtering and flow dispersing plate 17 is arranged in the heat storage tank 1 and close to the high-temperature molten salt inlet 14;
the high-temperature inlet of the heat exchanger 5 is connected with the high-temperature fused salt outlet 15 at the top end of the heat storage tank 1 through the high-temperature fused salt pump 6, the two sides of the heat exchanger 5 are respectively provided with a cooling water inlet 51 and a cooling water outlet 52, heat exchange is carried out on the high-temperature fused salt through cooling water, and the low-temperature outlet of the heat exchanger 5 is also connected with the inlet at the lower end of the fused salt storage tank 4.
The working method of the above embodiment is as follows: the low-temperature molten salt at the lower part of the heat storage tank 1 is delivered into the preheater 2 through the low-temperature inlet of the preheater 2 by the low-temperature molten salt pump 3, enters the molten salt storage tank 4 through the low-temperature outlet of the preheater 2 after exchanging heat with the high-temperature molten salt in the preheater 2, is further heated and warmed by the electric heating mechanism 41 in the molten salt storage tank 4, enters the preheater 2 through the high-temperature inlet of the preheater 2 after the temperature reaches a set temperature, then enters the upper part of the heat storage tank 1 from the high-temperature molten salt inlet 14 of the heat storage tank 1 through the high-temperature outlet of the preheater 2, the upper part of the heat storage tank 1 is the high-temperature molten salt, the lower part is the low-temperature molten salt, the middle layer is an inclined temperature layer area 12, the porous medium 11 is filled in the heat storage tank 1, thereby the fluidity and the heat transfer area of the molten salt are increased, when an inclined temperature layer thickness test experiment of a molten salt single-tank heat storage system is carried out, the high-temperature molten salt is delivered into the heat exchanger 5 from the high-temperature molten salt outlet 15 at the top end of the heat storage tank 1 by the high-temperature molten salt pump 6 and is cooled water The heat exchange is carried out, the temperature change rule of the thermocline in the heat release process is researched by the thermocouple 16, the highest temperature and the lowest temperature of the thermocline region 12 are determined according to the inlet temperatures of the high-temperature fused salt and the low-temperature fused salt of the heat storage tank 1, the temperature measured by the thermocouple 16 arranged in the heat storage tank 1 is matched with the temperature, the error between the temperature and the temperature reaches the test requirement, the thermocline region 12 is considered to be stable, and the thickness of the thermocline region 12 can be obtained by combining with the corresponding height calibrated outside the heat storage tank 1.
The specific type of the electronic element is not specially designated, and common products sold in the market can be selected as long as the use requirements of the electronic element can be met.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a test experiment platform of single jar of heat storage system thermocline thickness of fused salt which characterized in that includes:
the heat storage tank (1), the upper part in the heat storage tank (1) is high-temperature molten salt, the lower part in the heat storage tank (1) is low-temperature molten salt, and a thermocline region (12) is arranged between the high-temperature molten salt and the low-temperature molten salt;
the low-temperature inlet of the preheater (2) is connected with the low-temperature molten salt outlet (13) at the bottom end of the heat storage tank (1) through a low-temperature molten salt pump (3) and is used for conveying the low-temperature molten salt to the preheater (2) for heat exchange;
the molten salt storage tank (4) is internally provided with an electric heating mechanism (41), an inlet at the lower end of the molten salt storage tank (4) is connected with a low-temperature outlet of the preheater (2) and used for conveying low-temperature molten salt subjected to heat exchange by the preheater (2) into the molten salt storage tank (4) to be heated by the electric heating mechanism (41), an outlet at the upper end of the molten salt storage tank (4) is also connected with a high-temperature inlet of the preheater (2), and a high-temperature outlet of the preheater (2) is also connected with a high-temperature molten salt inlet (14) at the top end of the heat storage tank (1) and used for conveying the heated high-temperature molten salt to the upper part of the heat storage tank (1);
the high-temperature inlet of the heat exchanger (5) is connected with the high-temperature molten salt outlet (15) at the top end of the heat storage tank (1) through a high-temperature molten salt pump (6), the two sides of the heat exchanger (5) are further respectively provided with a cooling water inlet (51) and a cooling water outlet (52), heat exchange is carried out on the high-temperature molten salt through cooling water, and the low-temperature outlet of the heat exchanger (5) is further connected with the inlet at the lower end of the molten salt storage tank (4).
2. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 1, wherein the porous medium (11) is filled in the heat storage tank (1) above the thermocline region (12) and the heat storage tank (1) below the thermocline region (12).
3. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 1, wherein thirteen pairs of thermocouples (16) are uniformly arranged on the outer side of the heat storage tank (1) in a spiral manner, and a graduated scale for measuring the height is arranged on the outer side of the heat storage tank (1).
4. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 3, wherein thirteen pairs of thermocouples (16) are arranged in layers, and a pair of thermocouples (16) is symmetrically arranged on each layer for better measuring the temperature change rule.
5. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 1, wherein a high-temperature filtering and diffusing plate (17) is arranged inside the heat storage tank (1) close to the high-temperature molten salt inlet (14).
6. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 1, wherein a low-temperature filtering and diffusing plate (18) is arranged inside the heat storage tank (1) and close to the low-temperature molten salt outlet (13).
7. The test experiment platform for the thickness of the thermocline of the molten salt single-tank heat storage system according to claim 1, wherein the electric heating mechanism (41) comprises an electric heater (411) arranged inside the molten salt storage tank (4) and a power supply device (412) arranged outside the molten salt storage tank (4), and the power supply device (412) is connected with the electric heater (411).
CN202210131676.9A 2022-02-14 2022-02-14 Test experiment platform for thickness of thermocline of fused salt single-tank heat storage system Active CN114166887B (en)

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