Device for preventing storage tank molten salt from being solidified and using method thereof
阅读说明：本技术 一种防止储罐熔盐凝固的装置及其使用方法 (Device for preventing storage tank molten salt from being solidified and using method thereof ) 是由 靳亚斌 周三平 于 2019-11-29 设计创作，主要内容包括：一种防止储罐熔盐凝固的装置及其使用方法,装置包括罐体,罐体外侧壁螺旋形缠绕有内部循环流动高温导热油的折边蜂窝夹套；熔盐进出管从罐体顶部中心贯穿进入罐体至近罐体底部,熔盐进出管两侧设有两根从罐体顶部贯穿罐体至近底部的旋转轴,旋转轴轴心设有空气流道,旋转叶片、第一温度传感器和第一电加热装置安装在旋转轴上；白天,将被太阳能系统加热的高温熔盐通过熔盐进出管道注入罐体内进行保温储存；在夜晚或阴雨天气,装置启动,对罐体内的熔盐及对梯形管内的高温导热油进行循环加热；进行输出利用后,白天重新向罐体内注入经太阳能加热的高温熔盐,如此循环往复；本发明具有结构合理、操作简单、节能环保及安全性好的优点。(A device for preventing molten salt of a storage tank from being solidified and a using method thereof are disclosed, the device comprises a tank body, wherein the outer side wall of the tank body is spirally wound with a folded edge honeycomb jacket internally circulating and flowing high-temperature heat conducting oil; the molten salt inlet and outlet pipe penetrates into the tank body from the center of the top of the tank body to be close to the bottom of the tank body, two rotating shafts penetrating through the tank body from the top of the tank body to be close to the bottom are arranged on two sides of the molten salt inlet and outlet pipe, an air flow channel is arranged at the axis of each rotating shaft, and the rotating blades, the first temperature sensor and the first electric heating device are arranged on the rotating shafts; in the daytime, high-temperature molten salt heated by the solar system is injected into the tank body through a molten salt inlet and outlet pipeline for heat preservation and storage; at night or in rainy days, the device is started to circularly heat the fused salt in the tank body and the high-temperature heat conducting oil in the trapezoidal pipe; after output utilization, injecting the solar-heated high-temperature molten salt into the tank again in the daytime, and repeating the steps in such a way; the invention has the advantages of reasonable structure, simple operation, energy saving, environmental protection and good safety.)
1. The utility model provides a prevent device that storage tank fused salt solidifies, includes jar body (1), its characterized in that: the outer side wall of the tank body (1) is spirally wound with a folded honeycomb jacket (3), and the outermost side of the tank body (1) is coated with an insulating layer (2); the molten salt inlet and outlet pipe (10) penetrates through the center of the top of the tank body (1), a connecting flange (8) is arranged at the top end of the molten salt inlet and outlet pipe (10), two rotating shafts (9) penetrating through the top of the tank body (1) to the bottom of the tank body (1) are symmetrically arranged on two sides of the molten salt inlet and outlet pipe (10), an air flow channel (5) is arranged on the axis of each rotating shaft (9), a first temperature sensor (11) and a rotating blade (6) are arranged on the middle lower section of the outer side of each rotating shaft (9), and a first electric heating device (7) is further arranged at the.
2. The device for preventing the molten salt in the storage tank from being solidified according to the claim 1, is characterized in that: the edge-folded honeycomb jacket (3) is composed of a plurality of trapezoidal pipes (4), heat-conducting media are arranged in the trapezoidal pipes (4), second temperature sensors (14) are arranged outside the trapezoidal pipes (4), the outlet ends of the trapezoidal pipes (4) are converged and connected to the inlet end of a circulating pump (12), and the outlet end of the circulating pump (12) is connected with the inlet end of the trapezoidal pipes (4).
3. The device for preventing the molten salt in the storage tank from being solidified according to claim 2, wherein: and a second electric heating device (13) is also arranged on a pipeline at the inlet end or the outlet end of the circulating pump (12).
4. The device for preventing the molten salt in the storage tank from being solidified according to the claim 1, is characterized in that: the heat conducting medium in the trapezoid pipe (4) is high-temperature heat conducting oil.
5. The device for preventing the molten salt in the storage tank from solidifying is characterized in that: the temperature of the high-temperature heat conduction oil is 400-500 ℃.
6. The device for preventing the molten salt in the storage tank from being solidified according to the claim 1, is characterized in that: the rotating blades (6) are one or more groups.
7. The apparatus for preventing the solidification of molten salt in a storage tank according to claim 1 or 6, wherein: the flow pattern of the rotating blades (6) is axial flow.
8. The device for preventing the molten salt in the storage tank from being solidified according to the claims 1 and 2, is characterized in that: the first temperature sensor (11), the second temperature sensor (14), the first electric heating device (7), the second electric heater (13), the circulating pump (12) and the rotating shaft (9) are connected with an external control system.
9. A use method of a device for preventing molten salt in a storage tank from being solidified comprises the following specific steps:
1) an external control system is arranged in advance according to working requirements, and then high-temperature molten salt heated by a solar system in the daytime is conveyed into the tank body (1) through the molten salt inlet and outlet pipe (10) for storage and heat preservation;
2) in the storage process, when the temperature of the tank body (1) measured by the first temperature sensor (11) is lower than a set value, a signal is transmitted to an external control system, and the external control system starts the first electric heating device (7) to heat the molten salt in the tank body (1); when the second temperature sensor (14) detects that the temperature of the wall surface of the tank body (1) is reduced, a signal is transmitted to an external control system, the external control system starts a circulating pump (12) and a second electric heating device (13) to circularly heat the high-temperature heat conducting oil in the trapezoid pipe (4), and the temperature of the high-temperature heat conducting oil is ensured to be within the range of 400-500 ℃;
3) starting the device at night or in rainy days, controlling the rotating shaft (9) to stir the molten salt in the tank body (1) by the external control system, enabling the molten salt to move in an axial flow pattern in the tank body (1) by the rotating blades (6) to enable the temperature of the molten salt on the upper layer and the lower layer in the tank body (1) to be uniformly distributed, and then connecting the molten salt inlet pipe (10) with an external pump system to pump the high-temperature molten salt stored in the tank body (1) to a power generation system;
4) when the fused salt is pumped out to release heat, the temperature in the tank body (1) is reduced, the temperature of the tank body (1) is measured by the first temperature sensor (11) to be lower than a set value, a signal is transmitted to the external control system, and the external control system starts the first electric heating device (7) to heat the fused salt in the tank body (1), so that the temperature in the fused salt output process is not lower than a condensation point; when the fused salt is pumped out to release heat, the wall surface temperature of the tank body (1) is reduced, the second temperature sensor (14) detects that the wall surface temperature of the tank body (1) is reduced, signals are transmitted to an external control system, the external control system starts a circulating pump (12) and a second electric heating device (13) to circularly heat the high-temperature heat conduction oil in the trapezoid pipe (4), and the temperature of the high-temperature heat conduction oil is ensured to be within the range of 400-500 ℃;
5) when the solar photo-thermal system normally generates electricity, the fused salt absorbs solar energy again, and the solar energy is conveyed into the tank body (1) through the fused salt inlet and outlet pipe (10) for storage, and enters a new process cycle.
Technical Field
The invention belongs to the technical field of solar heat storage, and particularly relates to a device for preventing a storage tank from being solidified by molten salt and a using method thereof.
Background
As is well known, solar energy has the disadvantages of intermittency, low density and instability and difficult continuous supply, and the wide application of pure solar thermal power generation still has many problems to be solved at present. Due to the limitation of natural conditions such as day and night, seasons, geographical latitude and altitude and the influence of random factors such as sunny, cloudy and rain, solar irradiance reaching a certain ground is not only intermittent but also extremely unstable, which increases the difficulty for large-scale application of solar energy. In order to enable solar energy to become continuous and stable energy and finally become an alternative energy which can compete with conventional energy, the problem of energy storage needs to be well solved, namely solar radiation energy in sunny days is stored as much as possible for use at night or in rainy days, but energy storage is one of the weak links in solar energy utilization. The energy storage technology becomes a bottleneck of solar heat utilization development, and how to realize efficient and large-scale solar energy storage and ensure that solar energy is continuously supplied one day is a key problem of solar light-heat utilization.
Latent heat storage is heat storage by utilizing the principle that a substance absorbs heat in the phase change process, the energy storage medium absorbs solar energy in the heat absorption process to generate phase change, solar radiation energy is stored in latent heat of the phase change of the medium, the heat storage medium is changed into the original phase state in the heat release process, and a large amount of heat is released. The latent heat storage medium mainly comprises fused salt phase change energy storage, fused salt and inorganic material composite phase change energy storage and the like. Compared with media such as water, steam, high-temperature heat conduction oil, liquid metal and the like, the fused salt has the advantages of low price, low vapor pressure, wide use temperature range, chemical stability, high heat storage density and the like. The high-temperature fused salt is stored in the storage tank and is favorable for reducing the loss of heat, when the power grid is unstable due to external weather, the fused salt in the high-temperature storage tank is utilized to release heat to ensure stable power generation, and the heat release temperature of the high-temperature fused salt is reduced and then is pumped back for recycling. The reliability of the fused salt as a heat storage medium is proved at present, but the freezing point of the fused salt is high, the fused salt is easy to condense on the wall surface of the pipeline and the wall surface of the storage tank when being conveyed to an external pipeline, the alternating stress fatigue damage is caused on the pipeline and the wall surface of the storage tank, and the safety and reliability of the whole solar thermal power generation system are influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device for preventing the storage tank molten salt from being solidified and a using method thereof, which can effectively prevent the problem that the thermal stress of the wall surface of the storage tank and the pipeline is increased to cause faults and safety risks due to the condensation of the molten salt on the wall surface of the storage tank and the inner wall surface of the pipeline in the molten salt output process, and have the advantages of reasonable structure, simplicity in operation, energy conservation, environmental protection and good safety.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for preventing molten salt of a storage tank from being solidified comprises a tank body 1, wherein a folded
The edge-folded
And a second
The temperature of the high-temperature heat conduction oil is 400-500 ℃.
The rotating blades 6 are one or more groups.
The flow pattern of the rotating blades 6 is axial flow.
The temperature sensor 11, the
A use method of a device for preventing molten salt in a storage tank from being solidified comprises the following specific steps:
1) an external control system is arranged in advance according to working requirements, and then high-temperature molten salt heated by a solar system in the daytime is conveyed into the tank body 1 through the molten salt inlet and
2) in the storage process, when the temperature of the tank body 1 measured by the first temperature sensor 11 is lower than a set value, a signal is transmitted to an external control system, and the external control system starts the first electric heating device 7 to heat the molten salt in the tank body 1; when the
3) starting the device at night or in rainy days, controlling the rotating
4) when the fused salt is pumped out to release heat, the temperature in the tank body 1 is reduced, the first temperature sensor 11 detects that the temperature of the tank body 1 is lower than a set value, a signal is transmitted to an external control system, and the external control system starts the first electric heating device 7 to heat the fused salt in the tank body 1, so that the temperature is not lower than a condensation point in the fused salt output process; when the fused salt is pumped out to release heat, the temperature of the wall surface of the tank body 1 is reduced, the temperature of the wall surface of the tank body 1 is measured by the
5) when the solar photo-thermal system normally generates electricity, the fused salt absorbs solar energy again, and the solar energy is conveyed into the tank body 1 through the fused salt inlet and
According to the invention, the fused salt inlet and
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the structure of the flanged honeycomb jacket according to the present invention.
In the figure: 1. the wall surface of the storage tank; 2. a heat-insulating layer; 3. folding the honeycomb jacket; 4. a trapezoidal tube; 5. an air flow passage; 6. a rotating blade; 7. a first electric heating device; 8. a pipeline connecting flange; 9. a rotating shaft; 10. molten salt enters and exits the inlet line; 11. a temperature sensor; 12. a circulation pump; 13. a second electric heating device; 14. a
Detailed Description
The structure and operation of the present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the device for preventing the molten salt of the storage tank from being solidified comprises a tank body 1, wherein a folded
Referring to fig. 2, the folded
And a second
The heat-conducting medium in the trapezoid pipe 4 is high-temperature heat-conducting oil which transfers heat to the wall surface of the storage tank to prevent the temperature of the molten salt in the area near the wall surface of the storage tank from being lower than the freezing point in the molten salt output process.
The temperature of the high-temperature heat conduction oil is 400-500 ℃.
The rotating blades 6 are one or more groups.
The flow pattern of the rotating blades 6 is axial flow, so that the molten salt flows downwards to form an up-and-down circulating flow.
The temperature sensor 11, the
A use method of a device for preventing molten salt in a storage tank from being solidified comprises the following specific steps:
1) an external control system is arranged in advance according to working requirements, and then high-temperature molten salt heated by a solar system in the daytime is conveyed into the tank body 1 through the molten salt inlet and
2) in the storage process, when the temperature of the tank body 1 measured by the first temperature sensor 11 is lower than a set value, a signal is transmitted to an external control system, and the external control system starts the first electric heating device 7 to heat the molten salt in the tank body 1; when the
3) starting the device at night or in rainy days, controlling the rotating
4) when the fused salt is pumped out to release heat, the temperature in the tank body 1 is reduced, the first temperature sensor 11 detects that the temperature of the tank body 1 is lower than a set value, a signal is transmitted to an external control system, and the external control system starts the first electric heating device 7 to heat the fused salt in the tank body 1, so that the temperature is not lower than a condensation point in the fused salt output process; when the fused salt is pumped out to release heat, the temperature of the wall surface of the tank body 1 is reduced, the temperature of the wall surface of the tank body 1 is measured by the
5) when the solar photo-thermal system normally generates electricity, the fused salt absorbs solar energy again, and the solar energy is conveyed into the tank body 1 through the fused salt inlet and
The working principle of the invention is as follows:
in sunny days, a solar system heats molten salt through photo-thermal conversion, and the heated high-temperature molten salt is injected into the tank body 1 through the molten salt inlet and outlet pipeline 10 of the device for heat preservation and storage; when the temperature in the tank body 1 is lower than a set value measured by the first temperature sensor 11, the external control system starts the first electric heating device 7 to heat the molten salt in the tank body 1; when the temperature of the trapezoidal pipe 4 measured by the second temperature sensor 14 is lower than a set value, the external control system starts the circulating pump 12 and the second electric heating device 13 to circularly heat the high-temperature heat conducting oil in the trapezoidal pipe 4; the temperature in the molten salt output process is not lower than the condensation point, and the molten salt is effectively prevented from condensing near the wall surface of the tank body 1 in the molten salt liquid level descending process; at night or rainy day, store daytime in jar body 1 high temperature fused salt output utilization, starting drive, external control system control rotation axis 9 drives rotating vane 6, makes jar body 1 internal upper and lower floor fused salt temperature evenly distributed, and fused salt business turn over pipeline 10 links to external pump system, pumps out jar body 1 with the fused salt, injects the high temperature fused salt through solar energy heating in jar body 1 again daytime, so the circulation is reciprocal.
It should be understood that the above detailed description is only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above detailed description, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
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