Condensation conduction type fused salt power generation system

Abstract

The utility model discloses a light-gathering conduction type fused salt power generation system which comprises a light-gathering conduction device, the light-gathering conduction device converts sunlight into high-energy-density light beams and guides the light beams into a fused salt tank, a steam generator is arranged in the fused salt tank, a water inlet of the steam generator is connected with a water outlet of a water feeding pump, and a water outlet of the water feeding pump is connected with a water pump. A steam outlet of the steam generator is connected with an inlet of the steam turbine, a rotor of the steam turbine is connected with the generator, an outlet of the steam turbine is connected with an inlet of the condenser, and an outlet of the condenser is connected with a water inlet of the water feeding pump. The condensation conduction type fused salt power generation system has the advantages that the fused salt serves as an energy storage medium and is combined with the condensation conduction device, the problem that a traditional photo-thermal power generation system is large in occupied area is solved, and the limitation of regions is eliminated; in addition, the system has no solar energy loss caused by air, and the overall energy conversion efficiency of photo-thermal power generation is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar power generation, and particularly relates to a concentrating and conducting molten salt power generation system. Background Art

[0002] The continuous growth of global energy demand and the increasing environmental pressure have prompted countries to seek clean and sustainable energy solutions. In the energy structure dominated by traditional fossil fuels, the emissions of greenhouse gases, air pollution, and the limited nature of resources have all contributed to the transformation of the energy consumption pattern towards renewable energy. As a clean, pollution-free, and inexhaustible energy source, solar energy has received extensive attention in recent years. Solar power generation technologies mainly include photovoltaic power generation (PV) and concentrated solar power (CSP). Among them, concentrated solar power has gradually become the focus of research and application due to its unique energy storage and stable power supply capabilities.

[0003] Concentrated solar power focuses sunlight through a collector to generate high-temperature heat energy, which is used to drive a steam turbine to generate electricity. Compared with photovoltaic power generation, an important advantage of concentrated solar power is its natural energy storage ability, that is, by using molten salt or other media to store heat energy, it can continue to generate electricity without sunlight. This characteristic gives concentrated solar power significant advantages in terms of the stability of power output and the flexibility of scheduling, enabling it to better adapt to grid demand and reduce the impact on the grid. According to the type and working principle of the collector, concentrated solar power systems are mainly divided into trough-type collector systems, tower-type collector systems, dish-type collector systems, and linear Fresnel collector systems.

[0004] The trough-type collector system uses a parabolic trough-shaped reflector to concentrate sunlight on the collector tube. Its advantages lie in its mature technology and stable power output. However, its construction cost is high, it occupies a large area, and there are relatively high heat losses during long-distance transmission.

[0005] The tower-type collector system focuses sunlight on the receiver on the high tower through heliostats, with high efficiency and strong energy storage capabilities, and can continue to generate electricity at night. However, the construction of the tower system is complex, the cost is expensive, and the maintenance requirements for heliostats are relatively high.

[0006] The dish-type collector system uses a dish-shaped reflector for light concentration and generates electricity through a Stirling engine. This system has high efficiency and is suitable for modular deployment. However, due to its small single-unit capacity and complex maintenance, it is usually applied to distributed power generation in small-scale or remote areas.

[0007] The linear Fresnel collector system focuses light through multiple rows of planar reflectors. Its advantages are simple structure, low cost, and relatively small floor area. However, due to its low light concentration efficiency, the overall power generation efficiency of the system is relatively low, and the heat loss is large.

[0008] Although solar thermal power generation has many advantages, these four systems still face some challenges in practical applications. First of all, solar thermal power generation has a high dependence on geographical location and can only achieve the best efficiency in areas with abundant sunlight resources, which limits its application potential globally. Secondly, the current solar thermal power plants cover a large area and are not suitable for construction in inland areas or urban areas. Another key issue is that the efficiency of the solar thermal power generation system is limited by the design of the collector and the durability of the materials of the optical system, which also restricts its performance in wider applications.

[0009] The patent with the publication number "CN207922926U" discloses "molten salt pipeline system and solar power station". The molten salt pipeline system includes a cold salt tank (1), a hot salt tank (7), an air heating unit, a hot gas reversing valve (3), a molten salt pipeline and a cold gas reversing valve (6). The cold salt tank (1) transports salt materials to the hot salt tank (7) through the molten salt pipeline. The air heating unit includes a preheating pipeline capable of heating the air flowing through it. The two ends of the preheating pipeline are respectively connected to the two ends of the molten salt pipeline through the cold gas reversing valve and the hot gas reversing valve to form an air preheating circulation loop with the molten salt pipeline. However, in the solution of this patent, mainly two salt tanks are used to form an air preheating circulation loop to avoid the problem of too long preheating time caused by the heating device heating the molten salt pipeline through an electric heater in the prior art.

[0010] Therefore, this application proposes a concentrating and conductive molten salt power generation system. Summary of the Invention

[0011] The purpose of the present utility model is to provide a concentrating and conductive molten salt power generation system. By directly introducing a high-energy density light beam into the molten salt tank through a concentrating and conductive device, compared with the previous four systems using light reflection, the utilization efficiency of sunlight is greatly improved, and then the power generation efficiency is improved.

[0012] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0013] A concentrating and conductive molten salt power generation system includes a concentrating and conductive device. The concentrating and conductive device converts sunlight into a high-energy density light beam and introduces it into the molten salt tank. A steam generator is arranged in the molten salt tank. The water inlet of the steam generator is connected to the water outlet of a feed water pump. The steam outlet of the steam generator is connected to the inlet of a steam turbine. The rotor of the steam turbine is connected to a generator. The outlet of the steam turbine is connected to the inlet of a condenser. The outlet of the condenser is connected to the inlet of the feed water pump.

[0014] Preferably, the system further includes a frame. The molten salt tank is installed in the frame, and the concentrating and conductive device is installed on the frame.

[0015] Preferably, the light - collecting and conducting device is communicated with the molten - salt tank through a transparent quartz glass tube.

[0016] Preferably, a photovoltaic tracking system for adjusting the angle of the light - collecting and conducting device is arranged on the frame.

[0017] Preferably, the light - collecting and conducting device is a set of heat - collecting tube groups formed by at least one group of heat - collecting tubes. Each heat - collecting tube is composed of at least two heat - collecting units. Each heat - collecting unit includes a funnel - shaped fixing part. At the large - mouth of the fixing part, a first convex lens for receiving sunlight is arranged. At the small - mouth of the fixing part, a concave lens is arranged. The concave lens is connected with a glass tube for guiding out the high - energy - density light beam.

[0018] Preferably, the light - collecting and conducting device is a set of heat - collecting tube groups formed by at least one group of heat - collecting tubes. Each heat - collecting tube is composed of at least two heat - collecting units. Each heat - collecting unit includes a funnel - shaped fixing part. At the large - mouth of the fixing part, a second convex lens for receiving sunlight is arranged. At the small - mouth of the fixing part, a third convex lens is arranged. The third convex lens is connected with a glass tube for guiding out the high - energy - density light beam.

[0019] Preferably, the ends of the glass tubes of the heat - collecting units in the same heat - collecting tube are parallel to each other and closely arranged.

[0020] Preferably, the light - collecting and conducting device is composed of at least two - stage heat - collecting tube groups. The high - energy - density light beam converged by the upper - stage heat - collecting tube group enters the lower - stage heat - collecting tube group to continue converging, and finally is introduced into the molten - salt tank by the last - stage heat - collecting tube group.

[0021] Preferably, the molten - salt tank includes a tank body. A partition is arranged at the lower part of the tank body. On the partition, there are a stirring rod for stirring the molten salt, a heating rod for heating the molten salt, and an electric heater for assisting in heating the molten salt. A stirring shaft is installed on the stirring rod. A motor is arranged below the partition. The output shaft of the motor passes through the partition and is connected with the stirring rod. An exhaust hole is opened at the top of the tank body.

[0022] The beneficial effects of the present utility model are as follows:

[0023] 1. The present invention provides a light - collecting and conducting type molten - salt power generation system. By using molten salt as the energy - storage medium and combining with the light - collecting and conducting device, it overcomes the problem of large floor area of the traditional solar thermal power generation system and gets rid of the geographical restrictions. And there is no loss of sunlight energy due to air in this system, which greatly improves the overall energy conversion efficiency of solar thermal power generation. At the same time, at night or on rainy and cloudy days, the high specific heat capacity of molten salt enables the system to effectively store and release heat energy, so as to achieve all - weather power generation.

[0024] 2. The concentrating and conducting device consists of multiple heat collection units and multi-stage heat collection pipe groups, greatly improving the sunlight concentrating ability, enhancing the sunlight radiation intensity, further increasing the heating ability of molten salt, and improving the power generation efficiency of the device.

[0025] 3. By adjusting the angle of the concentrating and conducting device through the photovoltaic tracking system, it can ensure that it always faces the sun at the best angle, increasing the incident amount of light, maximizing the reception of sunlight, and thus improving the power generation efficiency.

[0026] 4. This system adopts the combination of a single molten salt tank and a steam generator, simplifying the design of the double molten salt tanks in the previous system, removing molten salt pipelines, heat absorbers, power equipment, etc., reducing the complexity of the system, and greatly enhancing the application potential of this system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the front view of the present utility model;

[0028] Figure 2 is the perspective view of the heat collection pipe of the present utility model;

[0029] Figure 3 is the top view of the heat collection pipe of the present utility model;

[0030] Figure 4 is the perspective view of the heat collection unit in Embodiment 1 of the present utility model;

[0031] Figure 5 is the cross-sectional view of the heat collection unit in Embodiment 1 of the present utility model;

[0032] Figure 6 is the perspective view of the two-stage heat collection pipe group of the present utility model;

[0033] Figure 7 is the perspective view of the two-stage heat collection pipe group of the present utility model from another angle;

[0034] Figure 8 is the perspective view of the heat collection pipe in the two-stage heat collection pipe group of the present utility model;

[0035] Figure 9 is the structural schematic diagram of the molten salt tank of the present utility model;

[0036] Figure 10 is Figure 9 's cross-sectional view;

[0037] Figure 11 is Figure 9 the internal structural schematic diagram of the molten salt tank in (hiding the tank body);

[0038] Figure 12 is the cross-sectional view of the heat collection unit in Embodiment 2 of the present utility model.

[0039] The accompanying drawings are only for illustrative purposes and should not be construed as limiting the patent; for better illustration of this embodiment, some components in the drawings may be omitted, enlarged or reduced, which does not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. Detailed implementation manners

[0040] The present utility model will be further described below with reference to the accompanying drawings.

[0041] Embodiment 1

[0042] As Figure 1 , Figure 9 — Figure 11 shown, a concentrating and conducting molten salt power generation system of this embodiment includes a concentrating and conducting device 1 and a frame 10. The concentrating and conducting device 1 is installed on the frame 10. A molten salt tank 4 is installed inside the frame 10. A photovoltaic tracking system 2 for adjusting the angle of the concentrating and conducting device 1 is also provided on the frame 10. The concentrating and conducting device 1 converts sunlight into a high-energy density light beam and conducts it into the molten salt tank 4 through a quartz glass tube 3. The quartz tube 3 is a high-purity transparent quartz glass tube. A steam generator 5 is arranged inside the molten salt tank 4. The water inlet 51 of the steam generator 5 is connected to the water outlet of a feed pump 6. The steam outlet 52 of the steam generator 5 is connected to the inlet of a steam turbine 9. The rotor of the steam turbine 9 is connected to a generator 8. The outlet of the steam turbine 9 is connected to the inlet of a condenser 7. The outlet of the condenser 7 is connected to the water inlet of the feed pump 6.

[0043] The photovoltaic tracking system 2 is a device for a solar photovoltaic power generation system. Its main function is to enable the solar panels to adjust the angle with the movement of the sun. The tracking device continuously adjusts the orientation of the photovoltaic panels to ensure that the photovoltaic panels always face the sun at the best angle, increasing the amount of incident light, so as to maximize the reception of sunlight and thus improve the power generation efficiency. The current tracking devices mainly have the following types: namely, single-axis tracking systems, dual-axis tracking systems, and azimuth angle tracking systems. In this embodiment, since the energy amplification and conduction device needs to ensure that sunlight vertically enters the lens in order to enable the concentrated sunlight to be normally conducted, a dual-axis tracking system with a higher precision should be used in combination with an azimuth angle tracking system to ensure that sunlight can vertically enter the concentrating and conducting device 1 at all times. This photovoltaic tracking system is an existing conventional technology and will not be elaborated in this embodiment.

[0044] Since the intensity of sunlight radiation changes with the movement of the sun, using only the concentrating and conducting device as the energy source will result in uneven power generation, and there is also the problem that power cannot be generated at night or on rainy and cloudy days. To achieve all-weather uninterrupted power generation, it is necessary to use it in combination with energy storage devices. Currently, the more widely used energy storage methods include pumped-storage, gravity energy storage, compressed air energy storage, molten salt energy storage, etc. Considering various factors such as construction cost and geographical restrictions to be applicable to the application scenarios in inland urban areas, the molten salt energy storage method is adopted in this embodiment.

[0045] During the use of this device, under sunlight irradiation, the photovoltaic tracking system 2 automatically adjusts to make the sunlight vertically enter the concentrating and conducting device 1. The concentrating and conducting device 1 strengthens the energy density of the sunlight. After strengthening to a certain intensity, the high-energy density light beam is introduced into the molten salt tank 4, and the molten salt in the tank absorbs the energy of the high-energy density light beam and the temperature rises. A steam generator 5 is placed in the molten salt tank 4. The feed water pump 6 pumps water into the steam generator 5. The water in the steam generator 5 absorbs the energy of the molten salt to generate superheated steam with a certain temperature and pressure. The superheated steam enters the steam turbine 9 through the pipeline, pushing the rotor of the steam turbine 9 to rotate, and then driving the generator 8 to generate electricity. The steam flowing through the steam turbine 9 enters the condenser 7, and in the condenser 7, the steam is cooled into water by air cooling or introducing cooling water, etc., and is pumped back into the steam generator 5 through the feed water pump 6 again to form a cycle. At night or on rainy and cloudy days when the sunlight is insufficient, the heat stored in the molten salt in the molten salt tank is used as the heat source, and 24-hour uninterrupted power generation can be achieved.

[0046] Such as Figure 2 — Figure 5As shown in the figure, the light-concentrating and conducting device 1 is a heat-collecting tube group formed by 19 heat-collecting tubes 11. Each heat-collecting tube 11 consists of seven heat-collecting units 100. Each heat-collecting unit 100 includes a funnel-shaped fixing member 102. At the large opening of the fixing member 102, there is a first convex lens 101 for receiving sunlight. At the small opening of the fixing member 102, there is a concave lens 103. The concave lens 103 is connected to a glass tube 104 for guiding out high-energy-density light beams. The glass tube 104 is a solid cylinder with the same cross-sectional area at each part. The distance between the first convex lens 101 and the concave lens 103 is the sum of their focal lengths. For example, if the focal length of the first convex lens 101 is 100 cm and the focal length of the concave lens 103 is -20 cm, then the distance between them is 80 cm. The diameter of the glass tube 104 is the same as that of the concave lens 103, and the contact end faces of the first convex lens 101, the concave lens 103, and the glass tube 104 with the concave lens 103 are coaxial. The cavity between the concave lens 103, the fixing member 102, and the convex lens 101 needs to be a sealed cavity and in a vacuum state. If it is difficult to achieve an internal vacuum state during implementation, a cooling device needs to be installed externally on the fixing member 102, otherwise there is a risk of overheating and damaging the equipment. The materials of the first convex lens 101, the concave lens 103, and the glass tube 104 are all transparent quartz glass with uniform texture and no cavities. If the requirements are not met, additional heat loss will occur, and a cooling device needs to be installed during implementation, otherwise there is a risk of overheating and damaging the equipment.

[0047] When the heat-collecting tube group is in use, first, its angle is adjusted through the photovoltaic tracking system 2 so that sunlight perpendicularly enters the first convex lens 101. After the sunlight is concentrated by the first convex lens 101, it falls on the concave lens 103. The light diverges after passing through the concave lens 103. Since the distance between the two lenses is the sum of their focal lengths, the light becomes parallel again after being concentrated and diverged. The sunlight passing through this process becomes parallel light with a greater energy density. This parallel light with an amplified energy density then enters the glass tube 104. The principle of the glass tube is the same as that of an optical fiber. The glass tube can be bent at a certain angle, and this light undergoes total internal reflection inside the glass tube. The bendability of the glass tube can change the traveling direction of the light. Since the light undergoes total internal reflection inside the glass tube, the light remains parallel after coming out of the glass tube. The bending radius of the glass tube 104 cannot be less than 10 times the diameter of the glass tube 104. In this embodiment, considering the tensile load, the bending radius of the glass tube 104 needs to be 15 times the diameter of the glass tube 104.

[0048] In this embodiment, considering the maximum utilization efficiency of space, seven heat collection units 100 are used to form a heat collection pipe 11, and 19 heat collection pipes 11 are used to form a heat collection pipe group, which is used in a form similar to a regular hexagon array. In some embodiments, any number of heat collection units 100 can also be used to form a heat collection pipe, and any number of heat collection pipes can be used to form a heat collection pipe group.

[0049] The ends of the quartz glass tubes 104 of the heat collection units 100 that make up the same heat collection pipe 11 are parallel to each other and closely arranged, aiming to converge the converged light beams so as to conduct the light beams conducted in the quartz glass tubes 104 of each heat collection unit 100 to the molten salt tank 4 or conduct them to the next-level heat collection unit 100 again for secondary convergence. The size of the first convex lens of the heat collection units in the secondary heat collection pipe group is the same as the size of the collection of the glass tube ends of all the heat collection units of the heat collection pipes in the primary heat collection pipe group. Generally speaking, the size of the first convex lens in the secondary heat collection pipe group is not the same as the size of the first convex lens in the primary heat collection pipe group. Similarly, in the third-level convergence, the quartz glass tubes 104 in the heat collection pipe group of the secondary convergence are converged so as to conduct the converged light beams to a lower-level convergence or conduct them to the molten salt tank 4 for use. The quartz glass tube 104 can be integrally provided with the Figure 1 quartz glass tube 3 therein to facilitate the introduction of the converged sunlight into the molten salt tank.

[0050] As Figure 6 — Figure 8 shown, the light condensing and conducting device is composed of two-level converging heat collection pipe groups. The high-energy density light beams converged by the primary converging heat collection pipe group 18 enter the heat collection units of the secondary convergence to continue converging, forming higher-level high-energy density light beams. All the secondary-converged light beams are converged and can be conducted into the molten salt tank 4 for use or continue to be conducted to the next-level heat collection pipe group for higher-level convergence, improving the solar energy collection efficiency.

[0051] In some embodiments, according to the actual situation, those skilled in the art can adopt three-level or more-level heat collection pipe groups, which should all be within the protection scope of this application.

[0052] In this embodiment, a single molten salt tank design is adopted, and the steam generator and the molten salt tank are designed as a two-in-one. As Figure 9 — Figure 11As shown in the figure, the molten salt tank includes a tank body 41, which is made of heat-insulating and heat-preserving material to prevent unnecessary heat exchange with the outside world. A partition 44 is provided at the lower part of the tank body 41. On the partition 44, there are a stirring rod 47 for stirring the molten salt, a heating rod 48 for heating the molten salt, and an electric heater 45 for assisting in heating the molten salt. A stirring shaft 471 is installed on the stirring rod 47, which can improve the stirring efficiency of the molten salt. An electric motor 46 is provided below the partition 44, and the output shaft of the electric motor 46 passes through the partition 44 and is connected to the stirring rod 47. The molten salt is stored inside the tank body and above the partition 44, and it is required to submerge all the heating rods 48. The heating rod 48 is made of tungsten or a material with a higher melting point, and it is required to be able to withstand the burning of a high-energy density beam and have excellent heat conduction performance. The heating rod 48 is connected to a transparent quartz glass tube 3 through a light beam inlet 42 opened on the tank body 41 to transfer the heat of the high-energy density beam to the molten salt in the tank. The heating rod 48 is fixed on the side wall of the tank body 41 through the light beam inlet 42. The electric motor 46 drives the stirring rod 47 to stir the molten salt inside the tank body to prevent uneven temperature distribution inside the tank body. The stirring rod 47 is required to be able to withstand high temperatures. The electric heater 45 is used to heat the molten salt inside the tank body in extreme cases, such as insufficient energy caused by long-term rainy weather. A steam generator 5 is placed inside the molten salt tank 4. The steam generator 5 needs to be immersed or semi-immersed in the molten salt in the molten salt tank, and it is required to be able to withstand high pressure and have good heat conduction performance. A water inlet pipe 51 passes through the tank body to transport water into the steam generator 5 for heating, and the generated superheated steam is discharged from the steam outlet 52. The pressure and temperature of the superheated steam can be controlled by controlling the water inflow of the water inlet 51 and the steam outflow of the steam outlet 52. To prevent the tank body from cracking due to the thermal expansion and contraction of the molten salt in the closed space, an exhaust hole 43 is opened at the top of the tank body 41, and the molten salt tank is connected to the outside atmosphere through the exhaust hole 43.

[0053] In the previous tower-type solar thermal power generation system, sunlight was concentrated by using the reflection of light. Inevitably, the heat absorber had to be placed at a high point, and the large weight of the molten salt restricted it from directly placing the molten salt tank on the top of the tower for heat absorption. Therefore, an implementation scheme with a double molten salt tank was adopted. However, the double molten salt tank had problems such as complex manufacturing, containing power components and transportation pipelines, high costs, and being prone to pipeline blockage and difficult to maintain. In this embodiment, the quartz glass tube can conduct the concentrated high-energy light beam, breaking the limitation of heat absorption at a high point in the traditional system. Therefore, a single molten salt tank design can be adopted to directly conduct the high-energy light beam to the molten salt tank installed on the ground to heat the molten salt. However, the single molten salt tank will bring problems of difficult maintenance and repair. It is recommended that in practical applications, multiple molten salt tanks can also be used. The water inlets of the steam generators in multiple molten salt tanks are all connected to the water outlet of the water pump 6. A pipeline connected to the water inlets of multiple steam generators one by one is arranged at the water outlet of the water pump 6. A valve capable of independently adjusting the flow rate of this pipeline is arranged on each pipeline. The steam outlets of the steam generators in multiple molten salt tanks are all connected to the inlet of the steam turbine 9. Multiple molten salt tanks do not communicate with or contact each other. By adjusting the distribution of the water flow rate, the heat exchange amount of the steam generators in different molten salt tanks is controlled, and thus the purpose of controlling the start and stop of different molten salt tanks and adjusting the output energy is achieved. By adopting the method of connecting the steam generators in multiple single molten salt tanks, not only the energy storage capacity is increased, but also the system complexity is reduced, and it is also beneficial for maintenance. In this embodiment, to make the application more extensive and reduce the manufacturing pressure, a single molten salt tank design is adopted. In practical applications, a single molten salt tank, a double molten salt tank, or a larger number of molten salt tanks can be adopted according to the actual situation. The protection of this patent is not limited to the number of molten salt tanks.

[0054] In addition, this embodiment also has the following advantages:

[0055] 1. High photothermal conversion efficiency. Different from the light reflection type concentration method, there is energy loss of light by air. In the process of concentrating and transmitting sunlight in this system, the loss generated depends on the purity of the glass and the vacuum degree of the cavity part. The photothermal conversion efficiency of this system can theoretically reach more than 90%, which can greatly improve the utilization efficiency of solar energy. Moreover, the materials used have low costs, are easy to manufacture, and have better development prospects.

[0056] 2. High space utilization rate. Compared with the previous solar thermal power generation systems (such as trough type, tower type, Fresnel type, dish type, etc.), this system occupies a small area, and the energy amplification device for receiving sunlight can be installed very compactly, with high space utilization rate, and can get rid of geographical restrictions, and can be built on the rooftops of high-rise buildings or factories in the city.

[0057] 3. Easy to manufacture and process. In this system, the heat collection system can be prepared modularly, and has a simple structure and is easy to maintain. And under the existing complete industrial chain, the steam generation device can also be quickly applied and implemented.

[0058] 4. Wide range of application scenarios. Different from photovoltaic panels, if the solar radiation is too strong, it may damage the photovoltaic panels, while this system is not affected by this. The stronger the solar radiation, the higher the energy efficiency. Due to this characteristic, it is very suitable as a power device in high-altitude areas, Earth orbits, the moon, and deep space zones.

[0059] Embodiment 2

[0060] The difference between this embodiment and Embodiment 1 is that the heat collection unit is composed of two convex lenses. The structure of the heat collection unit forming the heat collection pipe and the heat collection pipes forming the heat collection pipe group is the same as that in Embodiment 1.

[0061] As Figure 12 shown, the light condensing and conduction device 1 is a heat collection pipe group formed by 19 heat collection pipes 11. The heat collection pipe 11 is composed of seven heat collection units 100. The heat collection unit 100 includes a funnel-shaped fixing member 202. At the large opening of the fixing member 202, a second convex lens 201 for receiving sunlight is provided. At the small opening of the fixing member 202, a third convex lens 203 is provided. The third convex lens 203 is connected to a glass tube 204 for guiding out the high-energy density light beam. The distance between the second convex lens 201 and the third convex lens 203 is the sum of their focal lengths. For example, if the focal length of the second convex lens 201 is 100 cm and the focal length of the third convex lens 203 is 20 cm, then the distance between them is 120 cm.

[0062] The energy amplification device is divided into two types. One is the combination method of a convex lens, a concave lens, a fixing member, and a glass tube; the other is the combination method of a convex lens, a convex lens, a fixing member, and a glass tube. In these two types, the distance between the lenses is equal to the sum of their focal lengths. However, in the actual application process, considering that the latter has a converging focus, which may cause additional heat loss, this structure can be adopted in the case of single-stage convergence or two-stage convergence with low energy density, and it is not suitable for the high-energy density light such as three-stage or higher-stage convergence disclosed in this technical solution.

[0063] This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all belong to the protection scope of the technical solution of the present invention.

[0064] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protected content of the present utility model.

[0065] If terms such as "first" and "second" are used in this article to limit components, those skilled in the art should be aware that the use of "first" and "second" is only for the convenience of describing the present utility model and simplifying the description. Without additional statements, the above terms have no special meaning.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A concentrated conduction molten salt power generation system, characterized in that: It comprises a focusing conduction device, which converts sunlight into a high-energy-density light beam and introduces it into a molten salt tank. A steam generator is arranged in the molten salt tank. The water inlet of the steam generator is connected to the water outlet of a feed water pump, the steam outlet of the steam generator is connected to the inlet of a steam turbine, the rotor of the steam turbine is connected to a generator, the outlet of the steam turbine is connected to the inlet of a condenser, and the outlet of the condenser is connected to the water inlet of a feed water pump.

2. A concentrated light conduction molten salt power generation system according to claim 1, characterized in that: It also includes a frame, the molten salt tank is installed in the frame, and the focusing light conduction device is installed on the frame.

3. A concentrated light conduction molten salt power generation system according to claim 2, characterized in that: The light-concentrating conduction device is connected with the molten salt tank through a transparent quartz glass tube.

4. A concentrated light conduction molten salt power generation system according to claim 2, characterized in that: The frame is provided with a photovoltaic tracking system for adjusting the angle of the light-concentrating conduction device.

5. The concentrated light conduction molten salt power generation system according to claim 1, characterized in that: The focusing conduction device is a heat collecting tube group formed by at least one group of heat collecting tubes, and the heat collecting tubes are composed of at least two heat collecting units. The heat collecting unit includes a funnel-shaped fixing part, and a first convex lens for receiving sunlight is arranged at the large mouth of the fixing part, and a concave lens is arranged at the small mouth of the fixing part, and the concave lens is connected to a glass tube for deriving a high energy density light beam.

6. The concentrated light conduction molten salt power generation system according to claim 1, characterized in that: The focusing conduction device is a heat collecting tube group formed by at least one group of heat collecting tubes, and the heat collecting tubes are composed of at least two heat collecting units. The heat collecting unit includes a funnel-shaped fixing part, and a second convex lens for receiving sunlight is arranged at the large mouth of the fixing part, and a third convex lens is arranged at the small mouth of the fixing part. The third convex lens is connected to a glass tube for deriving a high energy density light beam.

7. A concentrated light conduction molten salt power generation system according to claim 5 or 6, characterized in that: The ends of the glass tubes of the heat collecting units in the same heat collecting tube are parallel to each other and closely arranged.

8. A concentrated light conduction molten salt power generation system according to claim 7, characterized in that: The light-concentrating conduction device is composed of at least two levels of heat collecting tube groups. The high-energy density light beam concentrated by the upper heat collecting tube group enters the next level of heat collecting tube group for further concentration, and is finally introduced into the molten salt tank by the last level of heat collecting tube group.

9. The concentrated light conduction molten salt power generation system according to claim 1, characterized in that: The molten salt tank comprises a tank body, a partition is arranged at the lower part of the tank body, a stirring rod for stirring the molten salt, a heating rod for heating the molten salt and an electric heater for auxiliary heating of the molten salt are arranged on the partition, a stirring shaft is installed on the stirring rod, a motor is arranged under the partition, the output shaft of the motor passes through the partition and is connected to the stirring rod, and an exhaust hole is opened on the top of the tank body.

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