Solar photo-thermal conversion fused salt heat and electrolysis system
By using Fresnel lenses and vacuum chamber collectors combined with electric heaters in small spaces, solar thermal conversion is used to preheat molten salt, solving the problem that traditional solar thermal equipment is difficult to implement in small-scale molten salt production processes. This achieves efficient molten salt preheating and electrolysis, and reduces energy consumption.
Patent Information
- Application Number
- CN202520487119.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-19
AI Technical Summary
Traditional large-scale solar thermal equipment is difficult to implement in small-scale molten salt production processes. How can we effectively utilize solar energy for molten salt preheating and electrolysis?
Using Fresnel lenses as light-collecting structures, combined with vacuum chamber collectors and electric heaters, molten salt is preheated through solar photothermal conversion. High-temperature electrolysis of molten salt is achieved by combining solar energy and electric heating, thus avoiding the need for high-tower construction.
It enables efficient use of solar energy to preheat molten salt in small spaces, reducing energy consumption, simplifying the engineering work, and making it easy to implement.
Smart Images
Figure CN223909757U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of fused salt electrolysis, especially to a solar thermal conversion fused salt heat and electrolysis system. BACKGROUND
[0002] The essence of the fused salt electrolysis method is to perform electrochemical oxidation or reduction of carbon materials based on electrode materials or active substances in fused salt.
[0003] However, the traditional large-scale thermal equipment uses a high tower as a heat collection facility, which is difficult to implement in small-scale fused salt production processes. UTILITY MODEL CONTENT
[0004] The utility model provides a solar thermal conversion fused salt heat and electrolysis system, which uses a Fresnel lens as a light collection structure to preheat the fused salt without the need for a high tower building and is easy to deploy in a small area.
[0005] The utility model adopts the following technical solutions.
[0006] The solar thermal conversion fused salt heat and electrolysis system comprises a low-temperature fused salt tank for storing low-temperature fused salt and a high-temperature fused salt pool for electrolyzing the fused salt.
[0007] The vacuum cavity collector comprises a heat absorber formed by combining a vacuum solenoid slot cavity pipe.
[0008] The vacuum solenoid slot cavity pipe is provided with a pipe cavity for conveying the fused salt.
[0009] The end of the fused salt conveying path is provided with an electric heater.
[0010] The high-temperature fused salt pool is provided with an electrolytic cell connected to an electrochemical workstation. When the electrolytic cell is working, the fused salt input into the electrolytic cell is heated to a process required temperature in a nitrogen environment for electrolysis.
[0011] A microwave generator is arranged above the high-temperature molten salt pool for facilitating heat transfer of the medium in the pool.
[0012] The electrolytic cell uses a built-in corundum crucible as a molten salt electrolyte carrier container.
[0013] The electrolytic cell uses a high-purity graphite rod as an inert anode, and uses a stainless steel mesh and a stainless steel wire to bundle the target carbon-based electrode to form an electrolytic cathode.
[0014] The electrolytic cell is connected with an inert gas gas circuit,
[0015] The molten salt conveying path takes the ground as the installation surface; the low-temperature molten salt tank is communicated with the vacuum cavity collector through the molten salt pump at the output end thereof.
[0016] The Fresnel lens is a convex spherical point focusing non-imaging Fresnel lens.
[0017] The utility model discloses a solar energy heat collecting system for molten salt electrolysis.
[0018] 1. For the high-temperature molten salt required in the molten salt electrolysis process, the solar light heating + electric heating technology is adopted to replace the traditional single electric heating process, and the green renewable energy is effectively utilized, and the power consumption required for molten salt thermal electrolysis is saved.
[0019] 2. Structural innovation: the solar energy heat collecting system designed by the utility model uses a point focusing Fresnel lens condenser to cooperate with a vacuum spiral groove cavity tube heat absorber to perform light-heat conversion on sunlight, can be directly arranged at the ground, does not need a high tower in the traditional large light-heat facility, reduces the engineering quantity, and is easy to implement.
[0020] 3. The utility model adopts the Fresnel lens condensing, the condensing surface can be customized through the lens structure, can form a strip-shaped or linear condensing area, and can heat the molten salt in the molten salt conveying pipeline through series connection. BRIEF DESCRIPTION OF DRAWINGS
[0021] The utility model will be further explained in detail in combination with the drawings and specific embodiments:
[0022] ATTACHED Figure 1 It is the schematic diagram of the utility model;
[0023] In the drawing: 1-Fresnel lens; 2-adjusting rod; 3-vacuum cavity collector; 4-electric heater; 5-electrochemical workstation; 6-inert gas gas circuit; 7-high-temperature molten salt pool; 8-microwave generator; 9-low-temperature molten salt tank. DETAILED DESCRIPTION
[0024] For example, Figure 1As shown, the solar light heat conversion molten salt heat, electrolysis system, using the solar light heat conversion molten salt heat, electrolysis method, the system includes a low temperature molten salt tank 9 for storing low temperature molten salt, a high temperature molten salt pool for electrolyzing molten salt; the molten salt conveying path between the low temperature molten salt tank and the high temperature molten salt pool includes a vacuum cavity collector 3 for preheating the molten salt; the vacuum cavity collector is provided at the solar light focusing area of the Fresnel lens 1 above the molten salt conveying path, the vacuum cavity collector uses low temperature molten salt as the heat storage medium for absorbing solar light energy, when the low temperature molten salt is conveyed in the vacuum cavity collector, it is preheated and heated by the solar light focusing of the Fresnel lens above it, the Fresnel lens is connected with a telescopic adjusting rod, and the light receiving surface of the lens is adjusted by the adjusting rod.
[0025] The vacuum cavity collector includes a heat absorber formed by a vacuum solenoid slot cavity tube combination;
[0026] A pipe cavity for conveying molten salt is arranged in the vacuum solenoid slot cavity tube, the heat absorber forms a heat exchange surface for the low temperature molten salt in a three-dimensional contact structure, and a heat preservation brick layer or a pipe heat preservation layer is arranged at the side surface of the heat absorber.
[0027] An electric heater 4 is arranged at the end of the molten salt conveying path, the electric heater heats the preheated molten salt to the process temperature required by the high temperature molten salt pool, and then pumps the molten salt into the high temperature molten salt pool 7.
[0028] The high temperature molten salt pool is provided with an electrolytic cell connected with an electrochemical workstation 5, the electrolytic cell uses the electrochemical workstation as an electrolysis voltage source, uses a built-in corundum crucible as a molten salt electrolyte carrier, uses a high-purity graphite rod as an inert anode, uses a stainless steel mesh and a stainless steel wire to bundle a target carbon-based electrode to form an electrolysis cathode, and the electrolytic cell is connected with an inert gas pipeline 6, when the electrolytic cell works, the molten salt input into the electrolytic cell is heated to a process required temperature in a nitrogen environment for electrolysis.
[0029] A microwave generator 8 is arranged above the high temperature molten salt pool for promoting the heat transfer of the medium in the pool.
[0030] The molten salt conveying path takes the ground as a mounting surface; the low temperature molten salt tank is communicated with the vacuum cavity collector through a molten salt pump at the output end thereof.
[0031] Embodiment 1:
[0032] In this example, the solar light heat conversion molten salt heat, electrolysis method is used for a molten salt electrolysis process, the method has a light focusing array composed of light focusing lenses arranged above the molten salt conveying path of the molten salt electrolysis process, an electric heater for heating molten salt is arranged at the end of the molten salt conveying path, the light focusing array focuses the transmitted sunlight at the molten salt conveying path, and the solar energy is used to preheat the molten salt to be input into the molten salt electrolysis process, so that the heating power consumption demand of the electric heater is reduced.
[0033] The condensing lens is a Fresnel lens.
[0034] When the Fresnel lens is a thin plate-shaped lens, the plurality of Fresnel lenses are spliced to increase the light receiving area of the condensing array and form a long shed-shaped structure above the molten salt conveying path.
[0035] The molten salt conveying path under the long shed-shaped structure is in a serpentine, zigzag or spiral shape, and the length of the path is increased to increase the duration of solar preheating of the molten salt before entering the electric heater to improve the temperature of the molten salt.
[0036] The Fresnel lens selected in the method is a convex spherical point focusing non-imaging Fresnel lens, and the optimal light bandwidth and condensing ratio at the molten salt conveying path are achieved by adjusting the different Fresnel lens geometric optical structures.
[0037] The convex spherical point focusing non-imaging Fresnel lens is provided with a telescopic adjusting rod 2 at the side edge, and the method adjusts the length of the adjusting rod to change the inclination angle of the Fresnel lens relative to the molten salt conveying path according to the solar azimuth, so that the condensing area of the Fresnel lens falls on the molten salt conveying path.
[0038] In this example, the molten salt pump is a pump that can convey fluid or powder, and the cell wall of the electrolytic cell is provided with heat preservation bricks.
[0039] In this example, when the plurality of Fresnel lenses are spliced to increase the light receiving area of the condensing array and form a long shed-shaped structure above the molten salt conveying path, and when the length of the molten salt conveying path is long and zigzag, the light receiving surface angle of each Fresnel lens is adjusted to make the condensing area of each Fresnel lens fall on the molten salt conveying path.
[0040] In this example, the vacuum solenoid cavity tube can be installed horizontally, and the light receiving area of the molten salt conveying path is increased by connecting a plurality of vacuum solenoid cavity tubes in series.
[0041] Embodiment 2:
[0042] This example is based on a molten salt electrolysis reaction system for solar light heat conversion, as shown in Figure 1
[0043] In this example, a light-heat conversion molten salt synthesis system is established, which is composed of a convex spherical point focusing non-imaging Fresnel lens, a vacuum cavity collector, a low-temperature molten salt tank, a high-temperature molten salt cell, a microwave generator, an electric heater and an electrochemical workstation. When working, the solar energy is heat converted by the Fresnel lens and the collector to improve the temperature of the heat storage molten salt medium, and then heated by the high-temperature electric heater to meet the process requirements of the particulate molten salt synthesis preparation.
[0044] In this example, the heat storage medium is selected as the eutectic salt of binary nitrate molten salt NaNO3+ KNO3, which has the advantages of low melting point, large specific heat capacity and low corrosion. In addition, SiO2 nanoparticles are added to improve the heat transfer efficiency.
[0045] In this example, in order to optimize the photo-thermal conversion efficiency and increase the molten salt temperature, the geometry of the Fresnel lens needs to be adjusted to achieve the optimal light bandwidth and concentration ratio.
[0046] In this example, the heat absorber is composed of a vacuum solenoid slot cavity tube, and different three-dimensional structures are processed to achieve the maximum heat exchange area.
[0047] In this example, a microwave generator is used to promote medium heat transfer, and heat preservation bricks and pipe insulation layers are designed and processed to reduce heat loss during flow.
[0048] The use process of this example is as follows: adjust the rod 2 to change the angle of the Fresnel lens according to the changing direction of the sun during the day to maximize the absorption of solar heat. The absorbed heat is absorbed by the vacuum solenoid slot cavity tube in the heat collector.
[0049] In this example, the molten salt fluid (or powder particles) in the cold molten salt tank is pumped into the heat collector. Since the heating of molten salt by solar energy is limited, an electric heater is also needed to heat it to the temperature of the thermal electrolysis reaction. The heated molten salt is pumped into the hot molten salt tank.
[0050] In this example, the molten salt reaching the thermal electrolysis reaction temperature is used as the electrolyte, an electrochemical workstation is used to provide voltage for the electrolysis cell, a corundum crucible is used as the carrier of the molten salt electrolyte, a high-purity graphite rod is used as the inert anode, and an external inert gas circuit is connected. The target carbon-based electrode is bundled into the electrolysis cathode using stainless steel mesh and wire, and is heated to different temperatures in nitrogen for electrolysis. Different modification effects can be obtained by changing the electrolysis voltage, molten pool temperature and electrolysis time, etc.
Claims
1. A solar photo-thermal conversion molten salt heat, electrolysis system, characterized in that: The system comprises a low-temperature molten salt tank for storing low-temperature molten salt, a high-temperature molten salt pool for electrolyzing the molten salt, and a molten salt conveying path between the low-temperature molten salt tank and the high-temperature molten salt pool, wherein the molten salt conveying path comprises a vacuum cavity collector for preheating the molten salt, the vacuum cavity collector is arranged at a solar light focusing area of a Fresnel lens above the molten salt conveying path, the vacuum cavity collector uses the low-temperature molten salt as a heat storage medium for absorbing solar light energy, and the low-temperature molten salt is preheated and heated by the solar light focusing of the Fresnel lens above the vacuum cavity collector when the low-temperature molten salt is conveyed in the vacuum cavity collector, the Fresnel lens is connected with a telescopic adjusting rod, and the light receiving surface of the lens is adjusted by the adjusting rod.
2. The solar, thermal to heat, electricity, molten salt, electrolytic system of claim 1 wherein: The vacuum cavity collector comprises a heat absorber formed by a combination of a vacuum spiral slot cavity pipe. A pipe cavity for conveying the molten salt is arranged in the vacuum spiral slot cavity pipe, the heat absorber forms a heat exchange surface for the low-temperature molten salt in a three-dimensional contact structure, and a heat preservation brick layer or a pipe heat preservation layer is arranged at the side of the heat absorber.
3. The solar, thermo-chemical heat-to-electricity, molten salt system of claim 1, wherein: An electric heater is arranged at the end of the molten salt conveying path, the electric heater heats the preheated molten salt to a process temperature required by the high-temperature molten salt pool, and then the molten salt is pumped into the high-temperature molten salt pool.
4. The solar, thermal to heat, electricity, molten salt, electrolytic system of claim 3, wherein: An electrolytic cell connected with an electrochemical workstation is arranged in the high-temperature molten salt pool, the electrolytic cell uses the electrochemical workstation as an electrolysis voltage source, and when the electrolytic cell works, the molten salt input into the electrolytic cell is heated to a process required temperature in a nitrogen environment for electrolysis.
5. The solar, thermo-chemical conversion molten salt heat, electrolytic system of claim 4, wherein: A microwave generator is arranged above the high-temperature molten salt pool for promoting heat transfer of the medium in the pool.
6. The solar, thermo-chemical conversion molten salt heat, electrolytic system of claim 4, wherein: The electrolytic cell uses an embedded corundum crucible as a molten salt electrolyte carrier container.
7. The solar, thermo-photovoltaic, molten salt heat, electric system of claim 4 wherein: The electrolytic cell uses a high-purity graphite rod as an inert anode, and uses a stainless steel mesh and a stainless steel wire to bundle a target carbon-based electrode to form an electrolytic cathode.
8. The solar, thermo-chemical conversion molten salt heat, electrolytic system of claim 4, wherein: The electrolytic cell is connected with an inert gas gas circuit.
9. The solar, thermo-photovoltaic, molten salt heat, electric system of claim 3, wherein: The molten salt conveying path uses the ground as a mounting surface, and the low-temperature molten salt tank is communicated with the vacuum cavity collector through a molten salt pump at the output end of the low-temperature molten salt tank.
10. The solar, thermo-chemical conversion molten salt heat, electrolytic system of claim 1, wherein: The Fresnel lens is a convex spherical point focusing non-imaging Fresnel lens.