High-temperature industrial zero-carbon system and method based on green electric power

Abstract

According to the high-temperature industrial zero-carbon system and method based on the green electric power, by means of cooperative operation of a first heat supply unit and a second heat supply unit, a first fluidized bed is driven to directly supply heat when the green electric power is sufficient, and meanwhile heat energy is stored in a heat storage unit through a second fluidized bed; when green power output is insufficient, the heat storage unit releases heat energy to the heat energy application unit, and continuous and stable high-temperature heat source output is achieved. The problem of green power consumption is effectively solved, the high-temperature industrial requirement is met, the overall performance of the system is remarkably improved, a path with technical feasibility and economical efficiency is provided for low-carbon transformation of high-energy-consumption industries such as steel and cement, and large-scale application of renewable energy sources in the high-temperature industrial process field is powerfully promoted.

Description

Technical Field

[0001] The present application relates to the technical field of green electricity high-temperature industrial decarbonization, and specifically to a high-temperature industrial zero-carbon system and method based on green electricity. Background Art

[0002] High-temperature industrial processes are widely used in industries such as metallurgy, chemicals, and cement. These sectors typically require large amounts of energy and face significant challenges in terms of energy consumption. Traditional energy supply relies primarily on fossil fuels such as coal and natural gas, which not only results in extremely high carbon emissions but also causes serious environmental pollution. Against the backdrop of intensifying global climate change and increasing environmental pressure, carbon emissions from these energy-intensive industries have become a critical component in achieving global emission reduction targets.

[0003] The rapid development of green power technology offers new opportunities for the low-carbon transition of high-temperature industrial processes. Leveraging its cost advantages and environmentally friendly features, green power technology has been widely adopted, providing a potential green energy solution for the industrial sector. However, green power supply exhibits significant seasonality and intermittency. For example, photovoltaic power generates high levels of electricity during abundant daylight hours, but its generation plummets at night and during cloudy periods. This instability makes it difficult to meet the sustained and stable energy needs of high-temperature industrial processes. Furthermore, the volatility of green power generation further exacerbates the challenges of green power consumption, leading to a serious imbalance between energy supply and demand. Summary of the Invention

[0004] To address the above-mentioned issues, the present invention provides a high-temperature industrial zero-carbon system and method based on green electricity. By utilizing the coordinated operation of a first heating unit and a second heating unit, when sufficient green electricity is available, the first fluidized bed in the first heating unit is driven to directly supply heat, while the second fluidized bed in the second heating unit stores heat energy in a heat storage unit. When green electricity output is insufficient, the heat storage unit in the second heating unit releases heat energy to the heat energy application unit, achieving continuous and stable high-temperature heat source output. This effectively solves the problem of green electricity consumption and meets the needs of high-temperature industries, significantly improving the overall performance of the system. It provides a technically feasible and economically viable path for the low-carbon transformation of high-energy-consuming industries such as steel and cement, and effectively promotes the large-scale application of renewable energy in high-temperature industrial processes.

[0005] In a first aspect, the present invention provides a high-temperature industrial zero-carbon system based on green electricity, the system comprising: A first heat supply unit (1), a second heat supply unit (2) and a heat energy application unit (3); The first heat supply unit (1) comprises a first fluidized bed (11), and the first fluidized bed (11) is connected to the heat energy application unit (3) via a first pipe (12); The second heat supply unit (2) comprises a second fluidized bed (21) and a heat storage unit (22); the second fluidized bed (21) and the heat storage unit (22) are connected via a second pipe (23); and the heat storage unit (22) and the heat energy application unit (3) are connected via a third pipe (24); The first fluidized bed (11) and the second fluidized bed (21) are electrically connected to a power generation system (4); the first fluidized bed (11), the second fluidized bed (21) and the heat storage unit (22) are built with heat carrier particles; The first heat supply unit (1) is configured to heat air using first high-temperature heat carrier particles formed in the first fluidized bed (11) to obtain a first high-temperature carrier gas, and supply the first high-temperature carrier gas to the heat energy application unit (3); The second heat supply unit (2) is at least configured to supply a second high-temperature carrier gas to the heat energy application unit (3) when the first heat supply unit (1) stops supplying the first high-temperature carrier gas to the heat energy application unit (3); The second high-temperature carrier gas is obtained by heating the air with second high-temperature heat carrier particles formed in the heat storage unit (22), and the second high-temperature heat carrier particles are formed by heating the third high-temperature carrier gas provided by the second fluidized bed (21).

[0006] Optionally, the first fluidized bed (11) and the second fluidized bed (21) are equipped with built-in electric heating elements (13); The electric heating element (13) adopts at least one working mode of resistance heating, electromagnetic induction heating, infrared heating or electrode heating; The electric heating element (13) is configured to be connected to the power generation system (4) to convert electrical energy into thermal energy for heating the heat carrier particles in the first fluidized bed (11) and the second fluidized bed (21).

[0007] Optionally, the system further comprises a first preheater (5) and a second preheater (6); The first preheater (5) is arranged on a first recovery pipe (51) between the first fluidized bed (11) and the heat energy application unit (3), and the second preheater (6) is arranged on a second recovery pipe (61) between the heat storage unit (22) and the heat energy application unit (3); wherein the air inlet end of the first preheater (5) and the air inlet end of the second preheater (6) are located on a side close to the heat energy application unit (3), the air outlet end of the first preheater (5) is located on a side close to the first fluidized bed (11), and the air outlet end of the second preheater (6) is located on a side close to the heat storage unit (22); The first preheater (5) is configured to exchange heat between the exhaust gas discharged from the heat energy application unit (3) and the air, and to transport the heated air to the first fluidized bed (11); The second preheater (6) is configured to exchange heat between the exhaust gas discharged from the heat energy application unit (3) and the air during the heat release phase, and to transport the heated air to the heat storage unit (22). Optionally, the system further comprises a third preheater (7); The third preheater (7) is arranged on a third recovery pipe (71) between the heat storage unit (22) and the second fluidized bed (21); The air inlet end of the third preheater (7) is located on a side close to the heat storage unit (22), and the air outlet end of the third preheater (7) is located on a side close to the second fluidized bed (21); The third preheater (7) is configured to exchange heat between the air discharged from the heat storage unit (22) with a temperature not lower than 300°C and air with a temperature lower than 50°C, and to transport the resulting gas to the second fluidized bed (21).

[0008] Optionally, the heat storage unit (22) includes a particle bed (221), and the particle bed (221) includes a fixed bed (222) and / or a fluidized bed (223); The particle bed (221) includes an air inlet end (224), a first air outlet end (225) and a second air outlet end (226); wherein the air inlet end (224) is connected to an end of the second pipe (23) away from the second fluidized bed (21); The first gas outlet end (225) is connected to an end of the third pipe (24) away from the heat energy application unit (3), and the second gas outlet end (226) is connected to an end of the third recovery pipe (71) away from the second fluidized bed (21).

[0009] Optionally, the heat storage unit (22) includes at least two fixed beds (222) and / or two fluidized beds (223); At least two of the fixed beds (222) are connected on a path between the second pipeline (23) and the third recovery pipe (71); and / or, at least two of the fluidized beds (223) are connected on the path between the second pipe (23) and the third recovery pipe (71); Wherein, the connection is in series or in parallel.

[0010] Optionally, the heat carrier particles include silicon carbide; The particle size of the heat carrier particles is between 0 μm and 200 μm.

[0011] Optionally, the heat storage unit (22) includes two types of heat carrier particles with different particle sizes; The particle size of the heat carrier particles in the first fluidized bed (11) and the second fluidized bed (21) is smaller than the particle size of the heat carrier particles in the heat storage unit (22).

[0012] Optionally, when the particle bed (221) includes the fixed bed (222), the particle sizes of the heat carrier particles in the fixed bed (222) are the same or decrease in sequence in the direction from the third recovery pipe (71) toward the second pipe (23); When the heat storage unit (22) includes the fluidized bed (223), in the direction from the third recovery pipe (71) toward the second pipe (23), the particle sizes of the heat carrier particles in the fluidized bed (223) are the same, or the heat carrier particles include two particle sizes.

[0013] In a second aspect, the present invention provides a high-temperature industrial zero-carbon method based on green electricity applicable to the system described in the first aspect, the method comprising: S1. The air is introduced into the first fluidized bed (11), and the power generation system (4) is used to supply power to the first fluidized bed (11) until the internal temperature of the first fluidized bed (11) reaches above 2000° C., thereby obtaining first high-temperature heat carrier particles; S2. Using the first high-temperature heat carrier particles to heat the air to obtain the first high-temperature carrier gas, and supplying the first high-temperature carrier gas to the heat energy application unit (3) through the first pipeline (12); S3, simultaneously introducing the air into the second fluidized bed (21), and using the power generation system (4) to supply power to the second fluidized bed (21), until the internal temperature of the second fluidized bed (21) reaches above 2000° C., thereby obtaining third high-temperature heat carrier particles; S4, using the third high-temperature heat carrier particles to heat the air to obtain a third high-temperature carrier gas, supplying the third high-temperature carrier gas to the heat storage unit (22) through the second pipe (23), so that the temperature of the heat carrier particles in the heat storage unit (22) is ≥2000° C., thereby obtaining second high-temperature heat carrier particles; S5. At least when the first heat supply unit (1) stops supplying the first high-temperature carrier gas to the heat energy application unit (3), the air is introduced into the heat storage unit (22), the air is heated by using the second high-temperature heat carrier particles, and a second high-temperature carrier gas having a temperature of ≥1500° C. is obtained, and the second high-temperature carrier gas is supplied to the heat energy application unit (3) through the third pipe (24).

[0014] In summary, the present invention has at least the following beneficial technical effects: 1. The present invention provides a high-temperature industrial zero-carbon system based on green electricity. This system utilizes green electricity to replace fossil energy, achieving deep decarbonization of high-temperature industrial processes, reducing greenhouse gas emissions, and complying with global carbon neutrality goals. The system operates in tandem with a first heating unit and a second heating unit. Since the second heating unit includes a second fluidized bed and a heat storage unit connected to the second fluidized bed, the high-temperature energy generated by the second fluidized bed can be stored in the heat storage unit. Thus, when sufficient green electricity is available, direct heat can be supplied by the first heating unit, while excess heat energy is stored in the heat storage unit via the second fluidized bed in the second heating unit. When green electricity output is insufficient, the heat storage unit in the second heating unit releases heat energy, thereby achieving continuous and stable high-temperature heat source output. This system effectively solves the green electricity consumption problem while meeting the needs of industrial high-temperature processes, significantly improving overall system performance. It provides a technically feasible and economically viable path for the low-carbon transformation of energy-intensive industries such as steel and cement, and strongly promotes the large-scale application of renewable energy in industrial high-temperature processes.

[0015] 2. The present invention provides a zero-carbon method for high-temperature industry based on green electricity. It uses green electricity to power the system operation and achieves zero-carbon emissions in high-temperature industrial processes. Among them, high-temperature carrier gas is used as a heat source, combined with the first heating unit and the second heating unit to achieve a stable supply of high-temperature industrial heat energy. This method uses green electricity to heat the heat carrier particles in the first fluidized bed to above 2000°C, and then introduces air to obtain the first high-temperature carrier gas as a direct heat source to supply the heat energy application unit. This changes the traditional model that relies on solid heat transfer. The heat transfer efficiency is more than 4 times that of the traditional method, avoiding the thermal resistance problem of solid heat transfer, and is more suitable for high-temperature industrial scenarios that require rapid and uniform heating. When the system is running, the second fluidized bed also reserves ultra-high temperature thermal energy for the heat storage unit. When the green electricity supply is interrupted, the heat storage unit can immediately release the stored heat energy, and the heat carrier particles heat the air to obtain a spare second high-temperature carrier gas of ≥1500°C, ensuring an uninterrupted supply of heat source, providing a high-efficiency, stable and environmentally friendly heat source solution for high-temperature industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 The following is a schematic diagram showing the structure of a high-temperature industrial zero-carbon system based on green electricity proposed in an embodiment of the present application; Figure 2 The process flow chart of the high-temperature industrial zero-carbon system based on green electricity proposed in an embodiment of the present application is shown; Figure 3 A schematic structural diagram showing a heat storage unit proposed in an embodiment of the present application, comprising a fixed bed and multiple fixed beds connected in series; Figure 4 A schematic diagram showing the structure of a heat storage unit proposed in an embodiment of the present application including a fluidized bed and multiple fluidized beds connected in series; Figure 5 A schematic diagram showing the structure of a heat storage unit proposed in an embodiment of the present application including a fixed bed and multiple fixed beds connected in parallel; Figure 6 A schematic diagram showing the structure of a heat storage unit proposed in an embodiment of the present application including a fluidized bed and multiple fluidized beds connected in parallel; Figure 7 A schematic diagram showing the structure of a heat storage unit proposed in an embodiment of the present application, comprising a fixed bed and a fluidized bed, with multiple fixed beds and multiple fluidized beds connected in parallel; Figure 8 A flow chart of a high-temperature industrial zero-carbon method based on green electricity proposed in an embodiment of the present application is shown.

[0018] Description of reference numerals: 1. First heating unit; 11. First fluidized bed; 12. First pipeline; 13. Electric heating element; 2. Second heating unit; 21. Second fluidized bed; 22. Thermal storage unit; 221. Particle bed; 222. Fixed bed; 223. Fluidized bed; 224. Air inlet; 225. First air outlet; 226. Second air outlet; 23. Second pipeline; 24. Third pipeline; 3. Thermal energy application unit; 4. Power generation system; 5. First preheater; 51. First recovery pipe; 6. Second preheater; 61. Second recovery pipe; 7. The third preheater; 71. The third recovery pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] In the drawings, the sizes of components, layer thicknesses, or regions may be exaggerated for clarity. Therefore, any implementation of the present disclosure is not necessarily limited to the dimensions shown in the drawings, and the shapes and sizes of components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate idealized examples, and any implementation of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0021] Existing molten salt heat storage technology is limited to operating temperatures below 600°C, making it unable to meet the high-temperature requirements of industries like metallurgy and chemical engineering, exceeding 2000°C. While pellet heat storage technology offers advantages such as high heat storage density and excellent thermal stability, practical applications still face challenges, such as insufficient heat resistance of conventional pellet materials, high heat loss during transportation, and significant wear and tear on pipelines.

[0022] Further research has revealed that green energy has the potential to replace traditional fossil fuels in high-temperature industries. However, existing technologies are limited by insufficient upper limits on heat source temperatures (generally below 1600°C), low heat transfer efficiency, and high operation and maintenance costs, making it difficult to meet the low-carbonization needs of high-temperature industries. Based on this, the present invention proposes a high-temperature industrial decarbonization system based on green electricity. By optimizing the particle material and heat transfer structure, this system achieves a heat temperature increase to over 2000°C, a heat transfer efficiency of over 90%, and significantly reduces operation and maintenance costs. This system meets the high-temperature heat source requirements of high-temperature industrial processes and promotes their low-carbon transformation.

[0023] See also Figure 1 and Figure 2 The present invention provides a high-temperature industrial zero-carbon system based on green electricity, the system comprising: A first heating unit 1, a second heating unit 2 and a heat energy application unit 3; The first heat supply unit 1 includes a first fluidized bed 11, and the first fluidized bed 11 is connected to the heat energy application unit 3 via a first pipe 12; The second heat supply unit 2 includes a second fluidized bed 21 and a heat storage unit 22. The second fluidized bed 21 and the heat storage unit 22 are connected via a second pipe 23. The heat storage unit 22 and the heat energy application unit 3 are connected via a third pipe 24. The first fluidized bed 11 and the second fluidized bed 21 are electrically connected to the power generation system 4; the first fluidized bed 11, the second fluidized bed 21 and the heat storage unit 22 are built with heat carrier particles; The first heat supply unit 1 is configured to heat air using first high-temperature heat carrier particles formed in the first fluidized bed 11 to obtain first high-temperature carrier gas, and supply the first high-temperature carrier gas to the heat energy application unit 3; The second heat supply unit 2 is at least configured to supply a second high-temperature carrier gas to the heat energy application unit 3 when the first heat supply unit 1 stops supplying the first high-temperature carrier gas to the heat energy application unit 3; The second high-temperature carrier gas is obtained by heating the air with second high-temperature heat carrier particles formed in the heat storage unit 22 , and the second high-temperature heat carrier particles are formed by heating the third high-temperature carrier gas provided by the second fluidized bed 21 .

[0024] In the present invention, the heat carrier particles are heat storage media (such as aluminum oxide and silicon carbide particles) and are used to store or transfer heat energy after being heated in the first fluidized bed 11, the second fluidized bed 21, and the heat storage unit 22. The high-temperature carrier gas is heated high-temperature air and can be directly supplied to high-temperature industries. The heat storage unit 22 is a device for storing heat energy. The power generation system 4 is a device that converts green energy into electrical energy. Green energy includes solar energy, wind energy, etc. The electricity converted from green energy is green electricity.

[0025] Thermal energy application unit 3 is for high-temperature industries such as steel (sintering, steel rolling), cement (rotary kiln), and glass melting furnaces that require temperatures above 800°C.

[0026] During specific implementation, when the green electricity supply is sufficient, in the first heat supply unit 1, the power generation system 4 is used to supply power to the first fluidized bed 11, and at the same time, air is passed into the first fluidized bed 11, so that the heat carrier particles are rapidly heated to obtain first high-temperature heat carrier particles; then the air speed is increased, so that the first high-temperature heat carrier particles are in contact with the accelerated air for heat exchange, and a first high-temperature carrier gas is obtained; the first high-temperature carrier gas is supplied to the heat energy application unit 3 through the first pipeline 12 for use; at the same time, in the second heat supply unit 2, the power generation system 4 supplies power to the second fluidized bed 21, and at the same time, air is passed into the second fluidized bed 21, so that the heat carrier particles are rapidly heated to obtain third high-temperature heat carrier particles, and then the air speed is increased, and the accelerated air is heated by the third high-temperature heat carrier particles to obtain a third high-temperature carrier gas; the third high-temperature carrier gas is transported to the heat storage unit 22 through the second pipeline 23, and the heat carried by the third high-temperature carrier gas is used to heat the heat carrier particles in the heat storage unit 22 to obtain second high-temperature heat carrier particles. This stage is the heat storage stage; When the green electricity supply is insufficient, the first fluidized bed 11 can be shut down, the supply of the first high-temperature carrier gas to the thermal energy application unit 3 is stopped, and the normal temperature air is transported to the heat storage unit 22. The air is heated by the second high-temperature heat carrier particles to obtain the second high-temperature carrier gas; the second high-temperature carrier gas is supplied to the thermal energy application unit 3 along the third pipeline 24 for use.

[0027] In the present invention, by combining green power generation with fluidized bed particle heat storage, the problems of intermittency, volatility, and high temperature requirements in high-temperature industrial applications of solar energy are effectively solved. When green power is sufficient, the system uses the first high-temperature carrier gas obtained by the first heating unit 1 to directly supply heat, and then combines with the second heating unit 2 to achieve hierarchical storage and release of thermal energy; when green power is insufficient, the thermal storage unit 22 is used to release the stored thermal energy and continuously provide high-temperature carrier gas, thereby breaking through the intermittent limitations of green power generation and achieving continuous and stable energy supply. Compared with traditional molten salt heat storage technology, the heat carrier particles used in the present invention can withstand temperatures above 2000 ° C, meeting the extreme process requirements of metallurgy, chemical industry, etc.

[0028] This invention utilizes a first fluidized bed 11, a second fluidized bed 21, and a thermal storage unit 22 for direct gas-solid heat exchange, achieving a heat exchange efficiency exceeding 90%, reducing heat loss by 15%-20% compared to traditional pipeline-transported thermal storage particles. This system utilizes green electricity and air heat transfer throughout its operation, addressing current issues of low energy efficiency, high carbon emissions, and unbalanced energy consumption in high-temperature industrial heating processes. It achieves zero-carbon, pollution-free green energy supply, meeting the needs of energy-intensive industries like metallurgy, chemicals, and cement, providing an economical and reliable decarbonization path for these sectors.

[0029] In some embodiments, see Figure 1 and Figure 2 , the first fluidized bed 11 and the second fluidized bed 21 are equipped with electric heating elements 13; The electric heating element 13 adopts at least one working mode of resistance heating, electromagnetic induction heating, infrared heating or electrode heating; The electric heating element 13 is configured to be connected to the power generation system 4 to convert electrical energy into thermal energy for heating the heat carrier particles in the first fluidized bed 11 and the second fluidized bed 21 .

[0030] In the present invention, the electric heating element 13 is a device that converts electrical energy into thermal energy, and is used to directly heat the heat carrier particles in the first fluidized bed 11 and the second fluidized bed 21 .

[0031] In this invention, by integrating multi-mode electric heating elements 13 into the first and second fluidized beds 11, 21, the application of green electricity in high-temperature industrial applications is further optimized. The system uses electricity to directly drive the electric heating elements 13, efficiently converting electrical energy into thermal energy. This not only breaks the 600°C temperature limit of traditional molten salt heat storage, allowing the heat carrier particles to quickly heat to over 2000°C, meeting the requirements of extreme high-temperature processes such as metallurgy and chemical engineering, but also allows for flexible switching of heating modes based on fluctuations in green electricity output, effectively mitigating the impact of intermittent green electricity supply on industrial energy supply, achieving continuous and stable energy supply, and effectively improving the overall energy efficiency of the system.

[0032] In some embodiments, see Figure 1 and Figure 2 , the system further comprises a first preheater 5 and a second preheater 6; The first preheater 5 is provided on the first recovery pipe 51 between the first fluidized bed 11 and the heat energy application unit 3, and the second preheater 6 is provided on the second recovery pipe 61 between the heat storage unit 22 and the heat energy application unit 3; The air inlet end 224 of the first preheater 5 and the air inlet end 224 of the second preheater 6 are located on a side close to the heat energy application unit 3, the air outlet end of the first preheater 5 is located on a side close to the first fluidized bed 11, and the air outlet end of the second preheater 6 is located on a side close to the heat storage unit 22; The first preheater 5 is configured to exchange heat between the exhaust gas discharged from the heat energy application unit 3 and the air, and to transport the heated air to the first fluidized bed 11; The second preheater 6 is configured to exchange heat between the exhaust gas discharged from the heat energy application unit 3 and the air during the heat release phase, and to transport the heated air to the heat storage unit 22 .

[0033] In the present invention, the first preheater 5 and the second preheater 6 are internally provided with a tube bundle heat exchange structure, which utilizes the waste heat of the tail gas to preheat the air entering the first fluidized bed 11 or the heat storage unit 22, thereby improving the thermal efficiency of the system; The first preheater 5 and the second preheater 6 each include two air inlet ports 224 and an exhaust port, wherein the air inlet ports 224 are used to supply air and exhaust gas to the first preheater 5 and the second preheater 6 respectively; the exhaust port is used to discharge the exhaust gas after cooling in the first preheater 5 and the second preheater 6; The first recovery pipe 51 and the second recovery pipe 61 are pipes connecting the heat energy application unit 3 with the first preheater 5 and the second preheater 6, and are used to transport the high-temperature exhaust gas discharged from the heat energy application unit 3; The tail gas includes the first high-temperature carrier gas and the second high-temperature carrier gas after cooling, as well as the waste gas discharged from the heat energy application unit 3 (such as a metallurgical furnace, a chemical reactor), which still carries a large amount of recoverable heat energy.

[0034] The heat release phase is an operation phase in which the heat storage unit 22 releases the second high-temperature carrier gas to the heat energy application unit 3 .

[0035] In specific implementation, when the green electricity supply is sufficient, the exhaust gas discharged from the heat energy application unit 3 enters the first preheater 5 through the first recovery pipe 51. At the same time, room temperature air is introduced into the first preheater 5 to exchange heat with the exhaust gas and heat the air to 300°C-500°C. The cooled exhaust gas is discharged from the first preheater 5, and the heated air is discharged into the first fluidized bed 11 and continues to be heated by the first high-temperature heat carrier particles until the first high-temperature carrier gas is obtained and continuously supplied to the heat energy application unit 3. When the green electricity supply is insufficient, the exhaust gas discharged from the thermal energy application unit 3 enters the second preheater 6 through the second recovery pipe 61. At the same time, room temperature air is introduced into the second preheater 6 to exchange heat with the air and heat the air to 300°C-500°C. The cooled exhaust gas is discharged from the second preheater 6, and the heated air is discharged to the heat storage unit 22 and continues to be heated by the second high-temperature heat carrier particles until the second high-temperature carrier gas is obtained to be continuously supplied to the thermal energy application unit 3.

[0036] In the present invention, by providing a first preheater 5 and a second preheater 6, the waste heat from high-temperature industrial exhaust (300°C-800°C) is utilized to preheat the air entering the system, raising the initial temperature of the cold air to 200°C-500°C. The heated air is then heated more quickly in the first fluidized bed 11 and the thermal storage unit 22, thereby shortening the heat transfer time, accelerating the heat energy supply rate, reducing the consumption of stored heat energy in the first fluidized bed 11 and the thermal storage unit 22, and extending the heating time of the first fluidized bed 11 and the thermal storage unit 22. By providing the first preheater 5 and the second preheater 6 to recover the heat from the high-temperature industrial exhaust, the present invention significantly improves the overall energy utilization efficiency of the system, reduces energy waste, and enhances the sustainability of energy utilization.

[0037] In some embodiments, see Figure 1 and Figure 2 , the system further comprises a third preheater 7; The third preheater 7 is provided on the third recovery pipe 71 between the heat storage unit 22 and the second fluidized bed 21; The air inlet end 224 of the third preheater 7 is located on a side close to the heat storage unit 22, and the air outlet end of the third preheater 7 is located on a side close to the second fluidized bed 21; The third preheater 7 is configured to exchange heat between the air discharged from the heat storage unit 22 with a temperature not lower than 300° C. and air with a temperature lower than 50° C., and to deliver the resulting gas to the second fluidized bed 21 .

[0038] In the present invention, the interior of the third preheater 7 is a tube bundle heat exchange structure for recovering the waste heat of the air above 300°C discharged from the heat storage unit 22; the third recovery pipe 71 is a pipe connecting the heat storage unit 22 and the second fluidized bed 21; The air with a temperature not lower than 300° C. is the air with a relatively high calorific value after the third high-temperature carrier gas has released heat in the heat storage unit 22 ; the air with a temperature lower than 50° C. is the ambient air or the low-temperature gas medium of the system circulation.

[0039] In specific implementation, when the green electricity supply is sufficient, the third high-temperature carrier gas obtained in the second fluidized bed 21 is continuously transported to the heat storage unit 22 through the second pipeline 23, and the heat carried by the third high-temperature carrier gas is used to heat the heat carrier particles to obtain second high-temperature heat carrier particles; the third high-temperature carrier gas after cooling still has a certain calorific value, and is transported to the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50°C is passed into the third preheater 7. After the two are mixed, the heat is transferred from high to low to obtain air with uniform temperature. This part of air is then transported to the second fluidized bed 21, and is continued to be heated by the third high-temperature heat carrier particles to obtain the third high-temperature carrier gas.

[0040] In the present invention, the provision of the third preheater 7 achieves efficient energy recycling and improves the overall thermal efficiency of the system. Furthermore, the system effectively reduces energy consumption through multi-stage utilization of waste heat, stabilizes the operating temperature of the second fluidized bed 21, and reduces damage to the equipment caused by temperature fluctuations.

[0041] In some embodiments, see Figure 1 and Figure 3 , the thermal storage unit 22 includes a particle bed 221, and the particle bed 221 includes a fixed bed 222 and / or a fluidized bed 223; The particle bed 221 includes an air inlet end 224, a first air outlet end 225 and a second air outlet end 226; The air inlet end 224 is connected to an end of the second pipe 23 away from the second fluidized bed 21; The first gas outlet end 225 is connected to an end of the third pipe 24 away from the heat energy application unit 3 , and the second gas outlet end 226 is connected to an end of the third recovery pipe 71 away from the second fluidized bed 21 .

[0042] In the present invention, the particle bed 221 is a heat storage medium layer composed of solid heat carrier particles; The air inlet end 224 is the entrance for the third high-temperature hot carrier gas to enter the particle bed 221; the first air outlet end 225 is the second high-temperature carrier gas outlet connected to the thermal energy application unit 3; the second air outlet end 226 is the third high-temperature carrier gas outlet after cooling connected to the third preheater 7.

[0043] In the present invention, the particle bed 221 may comprise only a fixed bed 222 or a fluidized bed 223, or both a fixed bed 222 and a fluidized bed 223 may be provided. Using both a fixed bed 222 and a fluidized bed 223 preserves the high heat storage density of the fixed bed 222 while also benefiting from the rapid heat exchange of the fluidized bed 223. When electricity is sufficient, the fluidized bed 223 and the fixed bed 222 rapidly store heat, while when electricity fluctuates, the fluidized bed 223 and the fixed bed 222 steadily release heat. This not only improves thermal energy utilization but also significantly enhances the system's ability to cope with intermittent green power supply.

[0044] When a fixed bed 222 and a fluidized bed 223 are used, the fixed bed 222 and the fluidized bed 223 are internally connected, the air inlet end 224 is arranged on the fixed bed 222 closest to the second pipe 23, the first air outlet end 225 is arranged on the fixed bed 222 closest to the third pipe 24, and the second air outlet end 226 is arranged on the fluidized bed 223 closest to the third recovery pipe 71.

[0045] In some embodiments, see Figure 1 and Figure 3 , the thermal storage unit 22 includes at least two fixed beds 222 and / or two fluidized beds 223; At least two of the fixed beds 222 are connected on the path between the second pipeline 23 and the third recovery pipe 71; and / or, at least two of the fluidized beds 223 are connected on the path between the second pipeline 23 and the third recovery pipe 71; Wherein, the connection is in series or in parallel.

[0046] In the present invention, Figure 3 and Figure 4As shown, when the heat storage unit 22 includes at least two fixed beds 222 or at least two fluidized beds 223, the at least two fixed beds 222 or at least two fluidized beds 223 are connected in series on a path formed between an end of the second pipe 23 away from the second fluidized bed 21 and an end of the third recovery pipe 71 close to the third preheater 7. An air inlet 224 and a second air outlet 226 are provided on each fixed bed 222 or each fluidized bed 223. The air inlet 224 on adjacent fixed beds 222 or adjacent fluidized beds 223 are connected to the second air outlet 226, so that the multiple fixed beds 222 or multiple fluidized beds 223 form a series structure. At this time, the air inlet 224 on the fixed bed 222 or fluidized bed 223 closest to the second pipe 23 is connected to the second pipe 23, and the second air outlet 226 on the fixed bed 222 or fluidized bed 223 closest to the third pipe 24 is connected to the third pipe 24. like Figure 3 and Figure 4 As shown, each fixed bed 222 or each fluidized bed 223 is provided with a first gas outlet 225, and a third pipe is respectively connected to the first gas outlet 225 on each fixed bed 222 or each fluidized bed 223, so that the third high-temperature carrier gas passes through each fixed bed 222 or each fluidized bed 223 in turn to heat the heat carrier particles therein, and obtains second high-temperature heat carrier particles in each fixed bed 222 or each fluidized bed 223. Each fixed bed 222 or each fluidized bed 223 uses the second high-temperature heat carrier particles to heat the air to obtain a second carrier gas. The second carrier gas enters the third pipe 24 along the first gas outlet 225 on each fixed bed 222 or each fluidized bed 223, and is transported to the thermal energy application unit 3 for use through the third pipe 24.

[0047] like Figure 1 As shown, when the thermal storage unit 22 includes at least two fixed beds 222 and at least two fluidized beds 223, the multiple fixed beds 222 and the multiple fluidized beds 223 can be sequentially connected in series on a path formed between an end of the second pipe 23 away from the second fluidized bed 21 and an end of the third recovery pipe 71 close to the third preheater 7; In one embodiment, the air inlet 224 on the fixed bed 222 can be connected to the second pipe 23, and the fluidized bed 223 can be connected between the fixed bed 222 and the adjacent fixed bed 222. In this order, multiple fixed beds 222 and fluidized beds 223 are connected in series. At this time, the third high-temperature carrier gas flows through each fixed bed 222 and fluidized bed 223 in the order of fixed bed 222, fluidized bed 223, and fixed bed 222, and heats the heat carrier particles therein. In one embodiment, the gas inlet 224 on the fluidized bed 223 can be connected to the second pipe 23, and the fixed bed 222 is connected between the fluidized bed 223 and the adjacent fluidized bed 223. In this order, multiple fixed beds 222 and fluidized beds 223 are connected in series. At this time, the third high-temperature carrier gas flows through each fluidized bed 223 and fixed bed 222 in the order of fluidized bed 223, fixed bed 222, and fluidized bed 223, and heats the heat carrier particles therein. In the above two cases, the number of fluidized beds 223 or fixed beds 222 between adjacent fixed beds 222 or adjacent fluidized beds 223 can be 1, 2, 4, 6, 8, etc., which is not specifically limited in the embodiments of the present invention; When the number is not limited, there is a case where all the fixed beds 222 are sequentially connected in series and then connected in series with the fluidized bed 223 , or all the fluidized beds 223 are sequentially connected in series and then connected in series with the fixed bed 222 .

[0048] In the present invention, Figure 3 and Figure 4 As shown, when multiple fixed beds 222 and / or multiple fluidized beds 223 are arranged in series, the second recovery pipe 61 is connected to one of the fixed beds 222 or fluidized beds 223 to facilitate the delivery of preheated air to the fixed bed 222 or fluidized bed 223. The preheated air passes through each fixed bed 222 or each fluidized bed 223 in turn and is heated to a high temperature state to obtain a second high-temperature carrier gas.

[0049] In the present invention, Figure 5 and Figure 6 As shown, at least two fixed beds 222 or at least two fluidized beds 223 are connected in parallel on a path formed between an end of the second pipe 23 away from the second fluidized bed 21 and an end of the third recovery pipe 71 close to the third preheater 7. At this time, each fixed bed 222 or each fluidized bed 223 is provided with an air inlet end 224, a first air outlet end 225 and a second air outlet end 226, as shown in FIG. Figure 5 and Figure 6 As shown, the second pipe 23 in the system is connected to the third pipe 24, each air inlet end 224 and each first air outlet end 225 are connected to the second pipe 23, and each second air outlet end 226 is connected to the third recovery pipe 71. Valves can be respectively provided on the second pipe 23 and the third pipe 24 to prevent the third high-temperature carrier gas from being delivered to the heat energy application unit 3 during heat storage, and to prevent the second high-temperature carrier gas from flowing back to the second fluidized bed 21 during heat release. In this case, during heat storage, the third high-temperature carrier gas can simultaneously enter multiple fixed beds 222 or multiple fluidized beds 223 to heat the heat carrier particles therein, and obtain second high-temperature heat carrier particles in each fixed bed 222 or each fluidized bed 223; during heat release, each fixed bed 222 or each fluidized bed 223 can supply the second high-temperature carrier gas to the heat energy application unit 3 through the third pipe 24. like Figure 7 As shown, when the thermal storage unit 22 includes at least two fixed beds 222 and at least two fluidized beds 223, the multiple fixed beds 222 and the multiple fluidized beds 223 can be sequentially connected in parallel on a path formed between an end of the second pipe 23 away from the second fluidized bed 21 and an end of the third recovery pipe 71 close to the third preheater 7; In one case, multiple fixed beds 222 and multiple fluidized beds 223 are connected in parallel in sequence. At this time, the second pipe 23 and the third pipe 34 are connected, and the air inlet end 224 and the first air outlet end 225 on each fixed bed 222 and each fluidized bed are connected to the second pipe 23, so that the third carrier gas can smoothly enter each fixed bed 222 and each fluidized bed 223, and the third high-temperature carrier gas simultaneously enters each fixed bed 222 and each fluidized bed 223 to heat the heat carrier particles therein, and second high-temperature heat carrier particles are obtained in each fixed bed 222 and each fluidized bed 223, and the second high-temperature carrier gas obtained in each fixed bed 222 and each fluidized bed 223 flows smoothly into the third pipe 24 for use by the heat energy application unit 3.

[0050] In one embodiment, multiple fixed beds 222 and multiple fluidized beds can be cross-connected in parallel, such as Figure 7 As shown, the one closest to the second fluidized bed is the fixed bed 222, followed by the fluidized bed 223, the fixed bed 222, and so on; the number of fluidized beds 223 or fixed beds 222 between adjacent fixed beds 222 or adjacent fluidized beds 233 can be 1, 2, 4, 6, 8, etc., which is not specifically limited in the embodiments of the present invention.

[0051] In the present invention, Figure 5 、 Figure 6 and Figure 7 As shown, when multiple fixed beds 222 and / or multiple fluidized beds 223 are arranged in parallel, the second gas outlet 226 of each fixed bed 222 and / or fluidized bed 223 is connected to the same pipe, which is connected to the third recovery pipe 71 and the second recovery pipe 61 respectively. In this case, valves can be respectively provided on the third recovery pipe 71 and the second recovery pipe 61 to avoid mixing of carrier gases, so that the air preheated by the second preheater 6 can enter each fixed bed 222 and each fluidized bed 223 at the same time, and the third carrier gas after cooling in each fixed bed 222 and each fluidized bed 223 is discharged into the third preheater 7 through the third recovery pipe 71.

[0052] In the present invention, by configuring multiple fixed beds 222 and / or multiple fluidized beds 223, and using parallel or series connections to build a flexible and scalable heat storage network, the overall system performance is improved. Preferably, multiple beds are configured in parallel, enabling linear growth in heat storage capacity, making it more adaptable to the needs of industries of varying scales.

[0053] In some embodiments, the heat carrier particles include silicon carbide; The particle size of the heat carrier particles is between 0 μm and 200 μm.

[0054] In this invention, silicon carbide microparticles with a particle size ranging from 0μm to 200μm are used as the heat carrier medium, leveraging their ultra-high temperature stability (temperature resistance exceeding 1600°C), high thermal conductivity (120 W / m·K), and excellent thermal shock resistance, significantly improving the overall performance of the system. The micron-sized particles provide a larger heat transfer area, increasing gas-solid heat transfer efficiency by over 40%. The high-temperature resistance of silicon carbide extends the system's operating temperature limit to over 2000°C, making it more suitable for high-temperature processes such as metallurgy.

[0055] In some embodiments, see Figure 2 , the heat storage unit 22 includes two types of heat carrier particles with different particle sizes; The particle size of the heat carrier particles in the first fluidized bed 11 and the second fluidized bed 21 is smaller than the particle size of the heat carrier particles in the thermal storage unit 22 .

[0056] In the present invention, large heat carrier particles within thermal storage unit 22 are deposited at the bottom, while small heat carrier particles are deposited above the large heat carrier particle layer. Because small particles exchange heat with air more quickly, placing them above the large particle layer allows for faster generation of the second high-temperature carrier gas during heat release. Placing large particles at the bottom of thermal storage unit 22 allows thermal storage unit 22 to store more heat per unit time.

[0057] In the present invention, smaller-sized heat carrier particles are used in the first fluidized bed 11 and the second fluidized bed 21 because small particles have a larger specific surface area, which significantly accelerates the heating response speed; larger-sized particles are used in the heat storage unit 22, which can be regarded as a distribution plate, so that the heating rate of the heat storage unit can be dynamically adjusted according to needs, solving the contradiction between "high heat exchange efficiency" and "high heat storage density" that is difficult to strike a balance in traditional systems.

[0058] In some embodiments, see Figure 1 and Figure 2 When the particle bed 221 includes the fixed bed 222 , the particle sizes of the heat carrier particles in the fixed bed 222 are the same or decrease in sequence in the direction from the third recovery pipe 71 toward the second pipe 23 ; When the heat storage unit 22 includes the fluidized bed 223 , in the direction from the third recovery pipe 71 toward the second pipe 23 , the heat carrier particles in the fluidized bed 223 have the same particle size, or include heat carrier particles of two sizes.

[0059] In the present invention, when the particle bed 221 includes the fixed bed 222, the particle sizes of all the heat carrier particles therein can be set to be exactly the same, or heat carrier particles of multiple particle sizes can be selected and placed in order from large to small in the direction from the third recovery pipe 71 toward the second pipe 23.

[0060] In the present invention, when the particle bed 221 includes a fluidized bed 223, the particle sizes of all heat carrier particles in the fluidized bed 223 can be set to be exactly the same; Alternatively, heat carrier particles of two different particle sizes can be set in the fluidized bed 223. The particle size of the heat carrier particles near the third recovery pipe 71 can be larger than the particle size of the heat carrier particles near the second pipe 23. During system operation, the large heat carrier particles act as a distribution plate for the fluidizing gas. After ventilation, the large heat carrier particles remain stationary, while the small heat carrier particles are fluidized. During the fluidization process, some small heat carrier particles are mixed with the large heat carrier particles, thereby improving heat transfer efficiency.

[0061] In some embodiments, see Figure 8 The high-temperature industrial zero-carbon method based on green electricity comprises: Step S1: introducing the air into the first fluidized bed 11 and supplying power to the first fluidized bed 11 using the power generation system 4 until the internal temperature of the first fluidized bed 11 reaches above 2000° C., thereby obtaining first high-temperature heat carrier particles; Step S2: using the first high-temperature heat carrier particles to heat the air to obtain the first high-temperature carrier gas, and supplying the first high-temperature carrier gas to the heat energy application unit 3 through the first pipeline 12; Step S3: simultaneously introducing the air into the second fluidized bed 21 and using the power generation system 4 to supply power to the second fluidized bed 21 until the internal temperature of the second fluidized bed 21 reaches above 2000° C., thereby obtaining third high-temperature heat carrier particles; Step S4: using the third high-temperature heat carrier particles to heat the air to obtain a third high-temperature carrier gas, supplying the third high-temperature carrier gas to the thermal storage unit 22 through the second pipe 23, so that the temperature of the heat carrier particles in the thermal storage unit 22 is greater than or equal to 2000° C., thereby obtaining second high-temperature heat carrier particles; Step S5: At least when the first heat supply unit 1 stops supplying the first high-temperature carrier gas to the heat energy application unit 3, the air is introduced into the heat storage unit 22, and the air is heated by the second high-temperature heat carrier particles to obtain a second high-temperature carrier gas with a temperature ≥ 1500°C, and the second high-temperature carrier gas is supplied to the heat energy application unit 3 through the third pipeline 24.

[0062] In the present invention, in step S1, the superficial operating velocity of the air is 2 to 5 times the minimum fluidization velocity of the heat carrier particles in the first fluidized bed 11; in step S2, when heating the air, the operating velocity of the air is not greater than 1.5 m / s; In step S3, the superficial operating velocity of the air is 2 to 5 times the minimum fluidization velocity of the heat carrier particles in the second fluidized bed 21; in step S4, when heating the air, the operating velocity of the air is not greater than 1.5 m / s.

[0063] The method provided by this invention uses green electricity to directly drive the first and second fluidized beds 11, 21, raising the temperature of the heat carrier particles to over 2000°C. This surpasses the temperature limitations of conventional electric heating technology and can meet the extreme heat demands of ultra-high-temperature industrial processes, such as specialty metallurgy and advanced materials synthesis. The thermal storage unit 22 also maintains high-temperature storage at 2000°C, ensuring that even during backup power supply, it can still output a high-temperature carrier gas of 1500°C or higher, thus preventing temperature fluctuations in the industrial process caused by energy switching. Specifically, when electricity is sufficient, the first heating unit 1 directly supplies heat to the heat application unit 3, while the second fluidized bed 21 in the second heating unit 2 continuously charges the thermal storage unit 22. When green electricity is insufficient, the thermal storage unit 22 seamlessly switches power supply, rapidly generating a second high-temperature carrier gas from pre-stored ultra-high-temperature heat carrier particles, ensuring production continuity. This method relies entirely on green electricity, avoiding the carbon emissions associated with fossil fuel combustion. Fluidized bed 223 technology combined with heat carrier particles is more suitable for ultra-high temperature scenarios than solutions such as molten salt heat storage, and has lower maintenance costs and higher energy utilization efficiency.

[0064] In order to enable those skilled in the art to more clearly understand the present invention, the high-temperature industrial zero-carbon system and method based on green electricity described in the present invention are now described in detail through the following examples.

[0065] Example 1 See also Figure 1 The schematic diagram of the structure of a high-temperature industrial zero-carbon system based on green electricity is shown. The green electricity used in Example 1 is photovoltaic power.

[0066] (1) When there is sufficient sunlight, the electric heating elements 13 (the electric heating elements 13 are resistive heating) in the first fluidized bed 11 and the second fluidized bed 21 are connected to the power generation system 4 respectively, and the power generation system 4 supplies power to the first fluidized bed 11 and the second fluidized bed 21 to heat the silicon carbide particles in the first fluidized bed 11 and the second fluidized bed 21 to above 2000°C. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively, and the apparent operating air velocity of the air is 3 times the minimum fluidization velocity of the silicon carbide particles. After heating, first high-temperature heat carrier particles and third high-temperature heat carrier particles are obtained; (2) increasing the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (the working gas velocity is not greater than 1.5 m / s), and heating the air with the first high-temperature heat carrier and the third high-temperature heat carrier, respectively, to obtain the first high-temperature carrier and the third high-temperature carrier gas; (3) The first high-temperature carrier gas is supplied to the heat energy application unit 3 through the first pipeline 12 for use. The exhaust gas discharged from the heat energy application unit 3 enters the first preheater 5 through the first recovery pipe 51. At the same time, air at room temperature is introduced into the first preheater 5 to exchange heat with the exhaust gas. After the exhaust gas cools down, it is discharged from the first preheater 5. The air is heated to 300°C-500°C and then transported to the first fluidized bed 11 to be further heated to above 2000°C by the first high-temperature heat carrier particles. It is then supplied to the heat energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source. (4) The third high-temperature carrier gas is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 through the second pipeline 23, and the silicon carbide particles therein are heated to obtain the second high-temperature heat carrier particles, and the heat is stored in the heat storage unit 22; the third high-temperature carrier gas is cooled to above 300 °C and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 °C is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 °C and 500 °C is obtained, which is then transported to the second fluidized bed 21 for recycling; (5) When the light intensity is insufficient, the first fluidized bed 11 is turned off, and the supply of the first high-temperature carrier gas to the heat energy application unit 3 is stopped; air at room temperature is introduced into the fixed bed 222 and / or the fluidized bed 223 of the heat storage unit 22, and the air is heated by the second high-temperature heat carrier particles to obtain the second high-temperature carrier gas, which is supplied to the heat energy application unit 3 through the third pipe 24 for use, thereby ensuring the continuous and stable operation of the heat energy application unit 3; (6) The exhaust gas discharged from the heat energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, air at room temperature is introduced into the second preheater 6 to exchange heat between the exhaust gas and the air at room temperature. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for continued heating and use. The exhaust gas after cooling is discharged from the second preheater 6.

[0067] Example 2 See also Figure 1 The schematic diagram of the structure of a high-temperature industrial zero-carbon system based on green electricity is shown. The green electricity used in Example 2 is wind power.

[0068] (1) When the wind is sufficient, the electric heating elements 13 (the electric heating elements 13 are resistive heating) in the first fluidized bed 11 and the second fluidized bed 21 are connected to the power generation system 4 respectively, and the power generation system 4 supplies power to the first fluidized bed 11 and the second fluidized bed 21 to heat the silicon carbide particles in the first fluidized bed 11 and the second fluidized bed 21 to above 2000°C. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively, and the apparent operating air velocity of the air is 2.5 times the minimum fluidization velocity of the silicon carbide particles. After heating, first high-temperature heat carrier particles and third high-temperature heat carrier particles are obtained; (2) increasing the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (the working gas velocity is not greater than 1.5 m / s), and heating the air with the first high-temperature heat carrier and the third high-temperature heat carrier, respectively, to obtain the first high-temperature carrier and the third high-temperature carrier gas; (3) The first high-temperature carrier gas is supplied to the heat energy application unit 3 through the first pipeline 12 for use. The exhaust gas discharged from the heat energy application unit 3 enters the first preheater 5 through the first recovery pipe 51. At the same time, air at room temperature is introduced into the first preheater 5 to exchange heat with the exhaust gas. After the exhaust gas cools down, it is discharged from the first preheater 5. The air is heated to 300°C-500°C and then transported to the first fluidized bed 11 to be further heated to above 2000°C by the first high-temperature heat carrier particles. It is then supplied to the heat energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source. (4) The third high-temperature carrier gas is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 through the second pipeline 23, and the silicon carbide particles therein are heated to obtain the second high-temperature heat carrier particles, and the heat is stored in the heat storage unit 22; the third high-temperature carrier gas is cooled to above 300 °C and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 °C is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 °C and 500 °C is obtained, which is then transported to the second fluidized bed 21 for recycling; (5) When the wind force is insufficient, the first fluidized bed 11 is closed, and the supply of the first high-temperature carrier gas to the heat energy application unit 3 is stopped; air at room temperature is introduced into the fixed bed 222 and / or the fluidized bed 223 of the heat storage unit 22, and the air is heated by the second high-temperature heat carrier particles to obtain the second high-temperature carrier gas, which is supplied to the heat energy application unit 3 through the third pipe 24 for use, thereby ensuring the continuous and stable operation of the heat energy application unit 3; (6) The exhaust gas discharged from the heat energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, air at room temperature is introduced into the second preheater 6 to exchange heat between the exhaust gas and the air at room temperature. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for continued heating and use. The exhaust gas after cooling is discharged from the second preheater 6.

[0069] Example 3 See also Figure 1 The schematic diagram of the structure of a high-temperature industrial zero-carbon system based on green electricity is shown. The green electricity used in Example 3 is photovoltaic power.

[0070] (1) When there is sufficient sunlight, the electric heating elements 13 (the electric heating elements 13 are resistive heating) in the first fluidized bed 11 and the second fluidized bed 21 are connected to the power generation system 4 respectively, and the power generation system 4 supplies power to the first fluidized bed 11 and the second fluidized bed 21 to heat the silicon carbide particles in the first fluidized bed 11 and the second fluidized bed 21 to above 2000°C. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively, and the apparent operating velocity of the air is 5 times the minimum fluidization velocity of the silicon carbide particles. After heating, first high-temperature heat carrier particles and third high-temperature heat carrier particles are obtained; (2) increasing the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (the working gas velocity is not greater than 1.5 m / s), and heating the air with the first high-temperature heat carrier and the third high-temperature heat carrier, respectively, to obtain the first high-temperature carrier and the third high-temperature carrier gas; (3) The first high-temperature carrier gas is supplied to the heat energy application unit 3 through the first pipeline 12 for use. The exhaust gas discharged from the heat energy application unit 3 enters the first preheater 5 through the first recovery pipe 51. At the same time, air at room temperature is introduced into the first preheater 5 to exchange heat with the exhaust gas. After the exhaust gas cools down, it is discharged from the first preheater 5. The air is heated to 300°C-500°C and then transported to the first fluidized bed 11 to be further heated to above 2000°C by the first high-temperature heat carrier particles. It is then supplied to the heat energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source. (4) The third high-temperature carrier gas is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 through the second pipeline 23, and the silicon carbide particles therein are heated to obtain the second high-temperature heat carrier particles, and the heat is stored in the heat storage unit 22; the third high-temperature carrier gas is cooled to above 300 °C and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 °C is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 °C and 500 °C is obtained, which is then transported to the second fluidized bed 21 for recycling; (5) When the light intensity is insufficient, the first fluidized bed 11 is turned off, and the supply of the first high-temperature carrier gas to the heat energy application unit 3 is stopped; air at room temperature is introduced into the fixed bed 222 and / or the fluidized bed 223 of the heat storage unit 22, and the air is heated by the second high-temperature heat carrier particles to obtain the second high-temperature carrier gas, which is supplied to the heat energy application unit 3 through the third pipe 24 for use, thereby ensuring the continuous and stable operation of the heat energy application unit 3; (6) The exhaust gas discharged from the heat energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, air at room temperature is introduced into the second preheater 6 to exchange heat between the exhaust gas and the air at room temperature. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for continued heating and use. The exhaust gas after cooling is discharged from the second preheater 6.

[0071] In summary, the green electricity-based, high-temperature industrial zero-carbon system and method provided by this invention achieves, through optimized particle materials and heat transfer structures, a thermal temperature increase of over 2000°C, a heat transfer efficiency exceeding 90%, and significantly reduced operation and maintenance costs. This system meets the high-temperature heat source requirements of high-temperature industrial processes and promotes the low-carbon transition of these processes. This system will provide strong technical support for the green transformation of the high-temperature industrial sector and contribute to the green transformation of the global energy structure.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0074] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0075] The above is a detailed introduction to a high-temperature industrial zero-carbon system and method based on green electricity provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A high-temperature industrial zero-carbon system based on green electricity, characterized in that: The system comprises: A first heat supply unit (1), a second heat supply unit (2) and a heat energy application unit (3); The first heat supply unit (1) comprises a first fluidized bed (11), and the first fluidized bed (11) is connected to the heat energy application unit (3) via a first pipe (12); The second heat supply unit (2) comprises a second fluidized bed (21) and a heat storage unit (22); the second fluidized bed (21) and the heat storage unit (22) are connected via a second pipe (23); and the heat storage unit (22) and the heat energy application unit (3) are connected via a third pipe (24); The first fluidized bed (11) and the second fluidized bed (21) are electrically connected to a power generation system (4); the first fluidized bed (11), the second fluidized bed (21) and the heat storage unit (22) are built with heat carrier particles; The first heat supply unit (1) is configured to heat air using first high-temperature heat carrier particles formed in the first fluidized bed (11) to obtain a first high-temperature carrier gas, and supply the first high-temperature carrier gas to the heat energy application unit (3); The second heat supply unit (2) is at least configured to supply a second high-temperature carrier gas to the heat energy application unit (3) when the first heat supply unit (1) stops supplying the first high-temperature carrier gas to the heat energy application unit (3); The second high-temperature carrier gas is obtained by heating the air with second high-temperature heat carrier particles formed in the heat storage unit (22), and the second high-temperature heat carrier particles are formed by heating the third high-temperature carrier gas provided by the second fluidized bed (21).

2. The high-temperature industrial zero-carbon system based on green electricity according to claim 1 is characterized in that: The first fluidized bed (11) and the second fluidized bed (21) are each equipped with an electric heating element (13); The electric heating element (13) adopts at least one working mode of resistance heating, electromagnetic induction heating, infrared heating or electrode heating; The electric heating element (13) is configured to be connected to the power generation system (4) to convert electrical energy into thermal energy for heating the heat carrier particles in the first fluidized bed (11) and the second fluidized bed (21).

3. The high-temperature industrial zero-carbon system based on green electricity according to claim 1 is characterized in that: The system further comprises a first preheater (5) and a second preheater (6); The first preheater (5) is arranged on a first recovery pipe (51) between the first fluidized bed (11) and the heat energy application unit (3), and the second preheater (6) is arranged on a second recovery pipe (61) between the heat storage unit (22) and the heat energy application unit (3); wherein the air inlet end of the first preheater (5) and the air inlet end of the second preheater (6) are located on a side close to the heat energy application unit (3), the air outlet end of the first preheater (5) is located on a side close to the first fluidized bed (11), and the air outlet end of the second preheater (6) is located on a side close to the heat storage unit (22); The first preheater (5) is configured to exchange heat between the exhaust gas discharged from the heat energy application unit (3) and the air, and to transport the heated air to the first fluidized bed (11); The second preheater (6) is configured to exchange heat between the exhaust gas discharged from the heat energy application unit (3) and the air during the heat release phase, and to transport the heated air to the heat storage unit (22).

4. The high-temperature industrial zero-carbon system based on green electricity according to claim 1 is characterized in that: The system further comprises a third preheater (7); The third preheater (7) is arranged on a third recovery pipe (71) between the heat storage unit (22) and the second fluidized bed (21); The air inlet end of the third preheater (7) is located on a side close to the heat storage unit (22), and the air outlet end of the third preheater (7) is located on a side close to the second fluidized bed (21); The third preheater (7) is configured to exchange heat between the air discharged from the heat storage unit (22) with a temperature not lower than 300°C and air with a temperature lower than 50°C, and to transport the resulting gas to the second fluidized bed (21).

5. The high-temperature industrial zero-carbon system based on green electricity according to claim 4 is characterized in that: The heat storage unit (22) includes a particle bed (221), and the particle bed (221) includes a fixed bed (222) and / or a fluidized bed (223); The particle bed (221) includes an air inlet end (224), a first air outlet end (225) and a second air outlet end (226); wherein the air inlet end (224) is connected to an end of the second pipe (23) away from the second fluidized bed (21); The first gas outlet end (225) is connected to an end of the third pipe (24) away from the heat energy application unit (3), and the second gas outlet end (226) is connected to an end of the third recovery pipe (71) away from the second fluidized bed (21).

6. The high-temperature industrial zero-carbon system based on green electricity according to claim 5 is characterized in that: The heat storage unit (22) includes at least two fixed beds (222) and / or two fluidized beds (223); At least two of the fixed beds (222) are connected on a path between the second pipeline (23) and the third recovery pipe (71); and / or, at least two of the fluidized beds (223) are connected on the path between the second pipe (23) and the third recovery pipe (71); Wherein, the connection is in series or in parallel.

7. The high-temperature industrial zero-carbon system based on green electricity according to claim 1 is characterized in that: The heat carrier particles include silicon carbide; The particle size of the heat carrier particles is between 0 μm and 200 μm.

8. The high-temperature industrial zero-carbon system based on green electricity according to claim 1 is characterized in that: The heat storage unit (22) includes two types of heat carrier particles with different particle sizes; The particle size of the heat carrier particles in the first fluidized bed (11) and the second fluidized bed (21) is smaller than the particle size of the heat carrier particles in the heat storage unit (22).

9. The high-temperature industrial zero-carbon system based on green electricity according to claim 6, characterized in that: When the particle bed (221) includes the fixed bed (222), in the direction from the third recovery pipe (71) toward the second pipe (23), the particle sizes of the heat carrier particles in the fixed bed (222) are the same, or decrease in sequence; When the heat storage unit (22) includes the fluidized bed (223), in the direction from the third recovery pipe (71) toward the second pipe (23), the particle sizes of the heat carrier particles in the fluidized bed (223) are the same, or the heat carrier particles include two particle sizes.

10. The high-temperature industrial zero-carbon method based on green electricity according to any one of claims 1 to 9, characterized in that: The method comprises: S1. The air is introduced into the first fluidized bed (11), and the power generation system (4) is used to supply power to the first fluidized bed (11) until the internal temperature of the first fluidized bed (11) reaches above 2000° C., thereby obtaining first high-temperature heat carrier particles; S2. Using the first high-temperature heat carrier particles to heat the air to obtain the first high-temperature carrier gas, and supplying the first high-temperature carrier gas to the heat energy application unit (3) through the first pipeline (12); S3, simultaneously introducing the air into the second fluidized bed (21), and using the power generation system (4) to supply power to the second fluidized bed (21), until the internal temperature of the second fluidized bed (21) reaches above 2000° C., thereby obtaining third high-temperature heat carrier particles; S4, using the third high-temperature heat carrier particles to heat the air to obtain a third high-temperature carrier gas, supplying the third high-temperature carrier gas to the heat storage unit (22) through the second pipe (23), so that the temperature of the heat carrier particles in the heat storage unit (22) is ≥2000° C., thereby obtaining second high-temperature heat carrier particles; S5. At least when the first heat supply unit (1) stops supplying the first high-temperature carrier gas to the heat energy application unit (3), the air is introduced into the heat storage unit (22), the air is heated by using the second high-temperature heat carrier particles, and a second high-temperature carrier gas having a temperature of ≥1500° C. is obtained, and the second high-temperature carrier gas is supplied to the heat energy application unit (3) through the third pipe (24).

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