A high-temperature industrial zero-carbon system and method based on green power

Abstract

The application provides a high-temperature industrial zero-carbon system and method based on green power, which utilizes the cooperative operation of a first heat supply unit and a second heat supply unit to drive the first fluidized bed to directly supply heat when the green power is sufficient, and simultaneously stores the heat energy in a heat storage unit by using the second fluidized bed; when the green power output is insufficient, the heat storage unit releases the heat energy to a heat energy application unit, so as to realize the continuous and stable output of the high-temperature heat source. The application effectively solves the problem of green power consumption, meets the demand of high-temperature industry, significantly improves the overall performance of the system, provides a path with technical feasibility and economic efficiency 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 the field of high-temperature industrial processes.

Description

Technical Field

[0001] This application relates to the field of green electricity high-temperature industrial decarbonization technology, and more specifically, to a high-temperature industrial zero-carbon system and method based on green electricity. Background Technology

[0002] High-temperature industrial processes are widely used in industries such as metallurgy, chemicals, and cement. These industries typically require large energy supplies and face significant challenges in energy consumption. Traditional energy supplies mainly rely on fossil fuels, such as coal and natural gas. This energy model not only results in extremely high carbon emissions but also causes severe environmental pollution. Against the backdrop of escalating global climate change and increasing environmental pressures, carbon emissions from these energy-intensive industries have become a crucial factor in achieving global emission reduction targets.

[0003] The rapid development of green power technologies has provided new opportunities for the low-carbon transformation of high-temperature industrial processes. With its cost advantages and environmentally friendly characteristics, green power technologies have been widely adopted, offering potential green energy solutions for the industrial sector. However, green power supply exhibits significant seasonality and intermittency. For example, photovoltaic power generation is high during the daytime when sunlight is abundant, but drops sharply at night and on cloudy days. This instability makes it difficult to meet the continuous and stable energy demands of high-temperature industrial processes. Furthermore, the volatility of green power generation further exacerbates the challenges of green power consumption, resulting in a severe imbalance between energy supply and demand. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a high-temperature industrial zero-carbon system and method based on green electricity. Utilizing the coordinated operation of a first heating unit and a second heating unit, when green electricity is abundant, the first fluidized bed in the first heating unit directly supplies heat, while the second fluidized bed in the second heating unit stores thermal energy in a heat storage unit. When green electricity output is insufficient, the heat storage unit in the second heating unit releases thermal energy to the heat application unit, achieving continuous and stable high-temperature heat source output. This effectively solves the problem of green electricity consumption, meets the demands of high-temperature industries, significantly improves the overall system performance, and provides a technically feasible and economically viable path for the low-carbon transformation of energy-intensive industries such as steel and cement, powerfully promoting 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:

[0006] The unit consists of a first heating unit (1), a second heating unit (2), and a thermal energy application unit (3).

[0007] The first heating unit (1) includes a first fluidized bed (11), and the first fluidized bed (11) is connected to the thermal energy application unit (3) through a first pipe (12).

[0008] The second heating 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 by a second pipe (23), and the heat storage unit (22) and the thermal energy application unit (3) are connected by a third pipe (24).

[0009] 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) contain heat carrier particles.

[0010] The first heating unit (1) is configured to heat air using the 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 thermal energy application unit (3).

[0011] The second heating unit (2) is configured to supply a second high-temperature carrier gas to the thermal energy application unit (3) when the first heating unit (1) stops supplying the first high-temperature carrier gas to the thermal energy application unit (3);

[0012] The second high-temperature carrier gas is obtained by heating the air with the 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).

[0013] Optionally, the first fluidized bed (11) and the second fluidized bed (21) are equipped with built-in electric heating elements (13);

[0014] The electric heating element (13) adopts at least one of the following working modes: resistance heating, electromagnetic induction heating, infrared heating or electrode heating;

[0015] The electric heating element (13) is configured to connect to the power generation system (4) to convert electrical energy into heat energy to heat the heat carrier particles in the first fluidized bed (11) and the second fluidized bed (21).

[0016] Optionally, the system further includes a first preheater (5) and a second preheater (6);

[0017] The first preheater (5) is disposed on the first recovery pipe (51) between the first fluidized bed (11) and the thermal energy application unit (3), and the second preheater (6) is disposed on the second recovery pipe (61) between the heat storage unit (22) and the thermal energy application unit (3);

[0018] The air inlet of the first preheater (5) and the air inlet of the second preheater (6) are located on the side closer to the thermal energy application unit (3), the air outlet of the first preheater (5) is located on the side closer to the first fluidized bed (11), and the air outlet of the second preheater (6) is located on the side closer to the heat storage unit (22).

[0019] The first preheater (5) is configured to exchange heat between the exhaust gas discharged from the thermal energy application unit (3) and the air, and to deliver the heated air to the first fluidized bed (11);

[0020] The second preheater (6) is configured to exchange heat between the exhaust gas discharged from the thermal energy application unit (3) and the air during the heat release phase, and to deliver the heated air to the heat storage unit (22).

[0021] Optionally, the system further includes a third preheater (7);

[0022] The third preheater (7) is disposed on the third recovery pipe (71) between the heat storage unit (22) and the second fluidized bed (21);

[0023] The air inlet of the third preheater (7) is located on the side close to the heat storage unit (22), and the air outlet of the third preheater (7) is located on the side close to the second fluidized bed (21).

[0024] The third preheater (7) is configured to exchange heat between air discharged from the heat storage unit (22) at a temperature not lower than 300 °C and air at a temperature lower than 50 °C, and to deliver the resulting gas to the second fluidized bed (21).

[0025] Optionally, the heat storage unit (22) includes a particle bed (221), which includes a fixed bed (222) and / or a fluidized bed (223);

[0026] The particle bed (221) includes an air inlet (224), a first air outlet (225), and a second air outlet (226);

[0027] The air inlet (224) is connected to the end of the second pipe (23) away from the second fluidized bed (21);

[0028] The first gas outlet (225) is connected to the end of the third pipe (24) away from the thermal energy application unit (3), and the second gas outlet (226) is connected to the end of the third recovery pipe (71) away from the second fluidized bed (21).

[0029] Optionally, the heat storage unit (22) includes at least two of the fixed beds (222) and / or two of the fluidized beds (223);

[0030] At least two of the fixed beds (222) are connected in the path between the second pipe (23) and the third recovery pipe (71);

[0031] And / or, at least two of the fluidized beds (223) are connected in the path between the second pipe (23) and the third recovery pipe (71);

[0032] The connection can be in series or in parallel.

[0033] Optionally, the heat carrier particles comprise silicon carbide;

[0034] The particle size of the heat carrier particles is between 0 μm and 200 μm.

[0035] Optionally, the heat storage unit (22) includes two types of heat carrier particles with different particle sizes;

[0036] 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).

[0037] Optionally, when the particle bed (221) includes the fixed bed (222), in the direction of the third recovery pipe (71) toward the second pipe (23), the particle size of the heat carrier particles in the fixed bed (222) is the same, or decreases sequentially;

[0038] When the heat storage unit (22) includes the fluidized bed (223), in the direction of 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 different particle sizes.

[0039] 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 above, the method comprising:

[0040] S1. 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 more than 2000 ℃, and the first high temperature heat carrier particles are obtained.

[0041] S2. Heat the air using the first high-temperature heat carrier particles to obtain the first high-temperature carrier gas, and supply the first high-temperature carrier gas to the thermal energy application unit (3) through the first pipeline (12).

[0042] S3. At the same time, the air is introduced into the second fluidized bed (21), and the power generation system (4) is used to supply power to the second fluidized bed (21) until the internal temperature of the second fluidized bed (21) reaches more than 2000 ℃, and the third high temperature heat carrier particles are obtained.

[0043] S4. Heat the air using the third high-temperature heat carrier particles to obtain a third high-temperature carrier gas, and supply 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 ℃, and obtain the second high-temperature heat carrier particles.

[0044] S5. At least when the first heating unit (1) stops supplying the first high-temperature carrier gas to the thermal energy application unit (3), the air is introduced into the heat storage unit (22), the air is heated by the second high-temperature heat carrier particles to obtain a second high-temperature carrier gas with a temperature ≥1500 ℃, and the second high-temperature carrier gas is supplied to the thermal energy application unit (3) through the third pipe (24).

[0045] In summary, the present invention has at least the following beneficial technical effects:

[0046] 1. This invention provides a high-temperature industrial zero-carbon system based on green electricity. This system utilizes green electricity to replace fossil fuels, achieving deep decarbonization of high-temperature industrial processes, reducing greenhouse gas emissions, and aligning with global carbon neutrality goals. The system employs a first heating unit and a second heating unit operating in tandem. Since the second heating unit includes a second fluidized bed and a heat storage unit connected to it, the high-temperature energy generated by the second fluidized bed can be stored in the heat storage unit. Thus, when green electricity is abundant, direct heating can be provided through the first heating unit, while excess heat energy is stored in the heat storage unit via the second fluidized bed within 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 effectively solves the problem of green electricity consumption, meets the requirements of high-temperature industrial processes, significantly improves the overall system performance, and provides a technically feasible and economically viable path for the low-carbon transformation of energy-intensive industries such as steel and cement, powerfully promoting the large-scale application of renewable energy in high-temperature industrial processes.

[0047] 2. This invention provides a method for zero-carbon high-temperature industrial processes based on green electricity. It utilizes green electricity to power the system, achieving zero carbon emissions in high-temperature industrial processes. Specifically, a high-temperature carrier gas serves as the heat source, and a stable supply of high-temperature industrial heat energy is achieved through a combination of a first heating unit and a second heating unit. This method uses green electricity to heat the heat carrier particles in the first fluidized bed to above 2000°C. Air is then introduced to obtain a first high-temperature carrier gas, which is supplied directly to the heat energy application unit. This changes the traditional solid-based heat transfer model, improving heat transfer efficiency by more than four times compared to traditional methods. It avoids the thermal resistance problem of solid-based heat transfer and is more suitable for high-temperature industrial scenarios requiring rapid and uniform heating. During system operation, the second fluidized bed simultaneously stores ultra-high-temperature heat energy for the heat storage unit. In the event of a green electricity outage, the heat storage unit can immediately release the stored heat energy, heating the air through the heat carrier particles to obtain a backup second high-temperature carrier gas at ≥1500°C, ensuring an uninterrupted heat source supply and providing an efficient, stable, and environmentally friendly heat source solution for high-temperature industries. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A schematic diagram of the structure of the high-temperature industrial zero-carbon system based on green electricity proposed in an embodiment of this application is shown;

[0050] Figure 2 The process flow diagram of the high-temperature industrial zero-carbon system based on green electricity proposed in the embodiments of this application is shown.

[0051] Figure 3 This illustration shows a schematic diagram of the structure of a heat storage unit proposed in an embodiment of this application, which includes a fixed bed and multiple fixed beds connected in series.

[0052] Figure 4 This illustration shows a schematic diagram of the structure of a heat storage unit proposed in an embodiment of this application, which includes a fluidized bed and multiple fluidized beds connected in series.

[0053] Figure 5 This illustration shows a schematic diagram of the structure of a heat storage unit according to an embodiment of the present application, which includes a fixed bed and multiple fixed beds connected in parallel.

[0054] Figure 6 This illustration shows a schematic diagram of the structure of a heat storage unit proposed in an embodiment of this application, which includes a fluidized bed and multiple fluidized beds connected in parallel.

[0055] Figure 7 This illustration shows a schematic diagram of a thermal storage unit proposed in an embodiment of this application, comprising a fixed bed and a fluidized bed, with multiple fixed beds and multiple fluidized beds connected in parallel.

[0056] Figure 8 A flowchart of a high-temperature industrial zero-carbon method based on green electricity, as proposed in an embodiment of this application, is shown.

[0057] Explanation of reference numerals in the attached figures:

[0058] 1. First heating unit; 11. First fluidized bed; 12. First pipeline; 13. Electric heating element;

[0059] 2. Second heating unit; 21. Second fluidized bed; 22. Heat 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;

[0060] 3. Thermal energy application unit;

[0061] 4. Power generation system;

[0062] 5. First preheater; 51. First recovery pipe;

[0063] 6. Second preheater; 61. Second recovery pipe;

[0064] 7. Third preheater; 71. Third recovery pipe. Detailed Implementation

[0065] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0066] In the accompanying drawings, the size of constituent elements, the thickness of layers, or areas may sometimes be exaggerated for clarity. Therefore, any implementation of this disclosure is not necessarily limited to the dimensions shown in the drawings, and the shapes and sizes of the components in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate ideal examples, and any implementation of this disclosure is not limited to the shapes or values ​​shown in the drawings.

[0067] Among related technologies, existing molten salt thermal energy storage technology is limited to operating temperatures below 600 ℃, which cannot meet the high-temperature requirements of industries such as metallurgy and chemical engineering, which exceed 2000 ℃. Although granular thermal energy storage technology has advantages such as high thermal density and good thermal stability, it still has some problems in practical applications, such as insufficient temperature resistance of conventional granular materials, large heat loss during transportation, and significant wear and tear on pipelines caused by materials.

[0068] Further research in this invention reveals that green energy has the potential to replace traditional fossil fuels in high-temperature industrial applications. However, existing technologies are limited by insufficient upper limits of heat source temperatures (generally below 1600℃), low heat transfer efficiency, and high operation and maintenance costs, making it difficult to meet the low-carbon requirements of high-temperature industries. Therefore, this invention proposes a high-temperature industrial decarbonization system based on green electricity. By optimizing particulate materials and heat transfer structures, it achieves a heat source temperature exceeding 2000℃, a heat transfer efficiency exceeding 90%, and significantly reduced operation and maintenance costs, thus meeting the high-temperature heat source requirements of high-temperature industrial processes and promoting their low-carbon transformation.

[0069] See Figure 1 and Figure 2 This invention provides a high-temperature industrial zero-carbon system based on green electricity, the system comprising:

[0070] First heating unit 1, second heating unit 2, and thermal energy application unit 3;

[0071] The first heating unit 1 includes a first fluidized bed 11, which is connected to the thermal energy application unit 3 via a first pipe 12.

[0072] The second heating 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 by a second pipe 23, and the heat storage unit 22 is connected to the thermal energy application unit 3 by a third pipe 24.

[0073] 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 contain heat carrier particles;

[0074] The first heating unit 1 is configured to heat air using the 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 thermal energy application unit 3.

[0075] The second heating unit 2 is configured to supply a second high-temperature carrier gas to the thermal energy application unit 3 when the first heating unit 1 stops supplying the first high-temperature carrier gas to the thermal energy application unit 3.

[0076] The second high-temperature carrier gas is obtained by heating the air with the 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.

[0077] In this invention, the heat carrier particles are heat storage media (such as alumina and silicon carbide particles) 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, which can be directly supplied to high-temperature industries; the heat storage unit 22 is a device for storing heat energy.

[0078] The power generation system 4 is a device that converts green energy into electrical energy. Green energy includes solar energy, wind energy, etc., and the electricity converted from it is green electricity.

[0079] Thermal energy application unit 3 is for high-temperature industries that require temperatures above 800 ℃, such as steel (sintering, rolling), cement (rotary kiln), and glass melting furnace.

[0080] In specific implementation, when the green electricity supply is sufficient, in the first heating unit 1, the power generation system 4 supplies power to the first fluidized bed 11, and simultaneously introduces air into the first fluidized bed 11, causing the heat carrier particles to heat up rapidly, obtaining first high-temperature heat carrier particles; then the air velocity is increased, allowing the first high-temperature heat carrier particles to contact and exchange heat with the accelerated air, obtaining first high-temperature carrier gas; the first high-temperature carrier gas is supplied to the thermal energy application unit 3 via the first pipe 12; simultaneously, in the second heating unit 2, the power generation system 4 supplies power to the second fluidized bed 21, and simultaneously introduces air into the second fluidized bed 21, causing the heat carrier particles to heat up rapidly, obtaining third high-temperature heat carrier particles; then the air velocity is increased, using the third high-temperature heat carrier particles to heat the accelerated air, obtaining third high-temperature carrier gas; the third high-temperature carrier gas is transported to the heat storage unit 22 via the second pipe 23, using the heat carried by the third high-temperature carrier gas to heat the heat carrier particles in the heat storage unit 22, obtaining second high-temperature heat carrier particles, this stage is the heat storage stage;

[0081] When the supply of green electricity is insufficient, the first fluidized bed 11 can be shut down to stop supplying the first high-temperature carrier gas to the thermal energy application unit 3, and instead supply room temperature air 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 then supplied to the thermal energy application unit 3 along the third pipeline 24.

[0082] This invention effectively solves the problems of intermittency, fluctuation, and high-temperature requirements in high-temperature industrial applications of solar energy by combining green power generation with fluidized bed particle thermal storage. When green power is abundant, the system directly supplies heat using the first high-temperature carrier gas obtained from the first heating unit 1, and then combines it with the second heating unit 2 to achieve graded storage and release of thermal energy. When green power is insufficient, the thermal storage unit 22 releases the stored thermal energy to continuously provide high-temperature carrier gas, thereby overcoming the intermittent limitation of green power generation and achieving continuous and stable energy supply. Compared with traditional molten salt thermal storage technology, the thermal carrier particles used in this invention can withstand temperatures above 2000 ℃, meeting the extreme process requirements of metallurgy, chemical industry, and other fields.

[0083] This invention employs a first fluidized bed 11, a second fluidized bed 21, and a heat storage unit 22 for direct gas-solid heat exchange, achieving a heat exchange efficiency exceeding 90%. This reduces heat loss by 15%-20% compared to traditional pipeline transport of heat storage particles. The system utilizes green electricity and air heat transfer throughout its operation, solving problems such as low energy efficiency, high carbon emissions, and unbalanced energy consumption in current high-temperature industrial heating processes. It achieves zero-carbon emission and pollution-free green energy supply, meeting the needs of high-energy-consuming industries such as metallurgy, chemicals, and cement, and providing an economical and reliable decarbonization path for these industries.

[0084] In some embodiments, see Figure 1 and Figure 2The first fluidized bed 11 and the second fluidized bed 21 are equipped with electric heating elements 13.

[0085] The electric heating element 13 adopts at least one of the following working methods: resistance heating, electromagnetic induction heating, infrared heating or electrode heating.

[0086] The electric heating element 13 is configured to connect to the power generation system 4 to convert electrical energy into heat energy to heat the heat carrier particles in the first fluidized bed 11 and the second fluidized bed 21.

[0087] In this invention, the electric heating element 13 is a device for converting electrical energy into heat energy, used to directly heat the heat carrier particles in the first fluidized bed 11 and the second fluidized bed 21.

[0088] In this invention, by integrating multi-mode electric heating elements 13 into the first fluidized bed 11 and the second fluidized bed 21, further optimization of the high-temperature industrial application of green electricity is achieved. The system utilizes electricity to directly drive the electric heating elements 13, efficiently converting electrical energy into heat energy. This not only breaks through the traditional molten salt heat storage temperature limit of 600 ℃, enabling the heat carrier particles to rapidly heat up to over 2000 ℃, meeting the requirements of extreme high-temperature processes such as metallurgy and chemical engineering; it 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.

[0089] In some embodiments, see Figure 1 and Figure 2 The system also includes a first preheater 5 and a second preheater 6;

[0090] The first preheater 5 is disposed on the first recovery pipe 51 between the first fluidized bed 11 and the thermal energy application unit 3, and the second preheater 6 is disposed on the second recovery pipe 61 between the heat storage unit 22 and the thermal energy application unit 3.

[0091] The air inlet 224 of the first preheater 5 and the air inlet 224 of the second preheater 6 are located on the side closer to the thermal energy application unit 3, the air outlet of the first preheater 5 is located on the side closer to the first fluidized bed 11, and the air outlet of the second preheater 6 is located on the side closer to the heat storage unit 22.

[0092] The first preheater 5 is configured to exchange heat between the exhaust gas discharged from the thermal energy application unit 3 and the air, and to deliver the heated air to the first fluidized bed 11.

[0093] The second preheater 6 is configured to exchange heat between the exhaust gas discharged from the thermal energy application unit 3 and the air during the heat release phase, and to deliver the heated air to the heat storage unit 22.

[0094] In this invention, the first preheater 5 and the second preheater 6 have tube bundle heat exchange structures inside, and use the waste heat of the exhaust gas to preheat the air entering the first fluidized bed 11 or the heat storage unit 22 to improve the thermal efficiency of the system.

[0095] The first preheater 5 and the second preheater 6 each include two air inlets 224 and one exhaust port. The air inlets 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 cooled exhaust gas from the first preheater 5 and the second preheater 6.

[0096] The first recovery pipe 51 and the second recovery pipe 61 are pipes connecting the thermal 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 thermal energy application unit 3.

[0097] The exhaust gas includes the first high-temperature carrier gas and the second high-temperature carrier gas after cooling, as well as the exhaust gas emitted by the thermal energy application unit 3 (such as a metallurgical furnace or a chemical reactor), which still carries a large amount of recoverable thermal energy.

[0098] The heat release stage is the operation stage in which the heat storage unit 22 releases the second high-temperature carrier gas to the thermal energy application unit 3.

[0099] In specific implementation, when the green power supply is sufficient, the exhaust gas discharged from the thermal 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 between the exhaust gas and the air, heating the air to 300 ℃-500 ℃. The cooled exhaust gas is discharged from the first preheater 5, and the heated air is discharged into the first fluidized bed 11, where it continues to be heated by the first high temperature heat carrier particles until the first high temperature carrier gas is obtained, which is continuously supplied to the thermal energy application unit 3.

[0100] When the supply of green electricity 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 between the exhaust gas and the air, heating the air to 300 ℃-500 ℃. The cooled exhaust gas is discharged from the second preheater 6, and the heated air is discharged to the heat storage unit 22, where it continues to be heated by the second high temperature heat carrier particles until the second high temperature carrier gas is obtained for continuous supply to the thermal energy application unit 3.

[0101] In this invention, by setting up a first preheater 5 and a second preheater 6, the waste heat of high-temperature industrial exhaust gas (300℃-800℃) is used to preheat the air entering the system, raising the initial temperature of the cold air to 200℃-500℃. The heated air can then reach the high temperature more quickly in the first fluidized bed 11 and the heat storage unit 22, thereby shortening the heat transfer time, accelerating the heat supply rate, reducing the consumption of heat energy stored in the first fluidized bed 11 and the heat storage unit 22, and extending the heating time of the first fluidized bed 11 and the heat storage unit 22. This invention, by setting up the first preheater 5 and the second preheater 6 to recover heat from high-temperature industrial exhaust gas, significantly improves the overall energy utilization efficiency of the system, reduces energy waste, and enhances the sustainability of energy utilization.

[0102] In some embodiments, see Figure 1 and Figure 2 The system also includes a third preheater 7;

[0103] The third preheater 7 is disposed on the third recovery pipe 71 between the heat storage unit 22 and the second fluidized bed 21;

[0104] The air inlet 224 of the third preheater 7 is located on the side close to the heat storage unit 22, and the air outlet of the third preheater 7 is located on the side close to the second fluidized bed 21.

[0105] The third preheater 7 is configured to exchange heat between air discharged from the heat storage unit 22 at a temperature not lower than 300°C and air at a temperature lower than 50°C, and to transport the resulting gas to the second fluidized bed 21.

[0106] In this invention, the third preheater 7 has a tube bundle heat exchange structure inside, which is used to recover the waste heat of air above 300°C emitted by 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.

[0107] Air with a temperature not lower than 300 ℃ is the third high-temperature carrier gas, which still has a high calorific value after the heat storage unit 22 has completed the heat release; air with a temperature lower than 50 ℃ is ambient air or low-temperature gas medium circulated by the system.

[0108] In practice, when the supply of green electricity 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. The heat carried by the third high-temperature carrier gas is used to heat the heat carrier particles to obtain the second high-temperature heat carrier particles. The cooled third high-temperature carrier gas still has a certain calorific value. It is transported to the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 ℃ is introduced into the third preheater 7. After the two are mixed, the heat is transferred from high to low to obtain air with a uniform temperature. This part of the air is then transported to the second fluidized bed 21 and continues to be heated by the third high-temperature heat carrier particles to obtain the third high-temperature carrier gas.

[0109] In this invention, by setting up a third preheater 7, efficient energy recycling is achieved, improving the overall thermal efficiency of the system. Furthermore, the system effectively reduces energy consumption through multi-stage utilization of waste heat; it also stabilizes the operating temperature of the second fluidized bed 21, reducing the damage to the equipment caused by temperature fluctuations.

[0110] In some embodiments, see Figure 1 and Figure 3 The heat storage unit 22 includes a particle bed 221, which includes a fixed bed 222 and / or a fluidized bed 223.

[0111] The particle bed 221 includes an air inlet 224, a first air outlet 225, and a second air outlet 226;

[0112] The air inlet 224 is connected to the end of the second pipe 23 that is away from the second fluidized bed 21;

[0113] The first air outlet 225 is connected to the end of the third pipe 24 away from the thermal energy application unit 3, and the second air outlet 226 is connected to the end of the third recovery pipe 71 away from the second fluidized bed 21.

[0114] In this invention, the particle bed 221 is a heat storage medium layer composed of solid heat carrier particles stacked together.

[0115] The inlet 224 is the entrance for the third high-temperature hot carrier gas to enter the particle bed 221; the first outlet 225 is the outlet for the second high-temperature carrier gas connected to the thermal energy application unit 3; and the second outlet 226 is the outlet for the cooled third high-temperature carrier gas connected to the third preheater 7.

[0116] In this invention, the particle bed 221 may consist of only a fixed bed 222 or a fluidized bed 223, or both a fixed bed 222 and a fluidized bed 223 may be used. When using both a fixed bed 222 and a fluidized bed 223, the high heat storage density of the fixed bed 222 is retained, while the rapid heat exchange advantage of the fluidized bed 223 is also achieved. When power is abundant, the fluidized bed 223 and the fixed bed 222 rapidly store heat; when power fluctuates, the fluidized bed 223 and the fixed bed 222 stably release heat. This not only improves the thermal energy utilization rate but also significantly enhances the system's ability to cope with intermittent green power supply.

[0117] 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 224 is located on the fixed bed 222 closest to the second pipe 23, the first air outlet 225 is located on the fixed bed 222 closest to the third pipe 24, and the second air outlet 226 is located on the fluidized bed 223 closest to the third recovery pipe 71.

[0118] In some embodiments, see Figure 1 and Figure 3 The heat storage unit 22 includes at least two fixed beds 222 and / or two fluidized beds 223;

[0119] At least two of the fixed beds 222 are connected in the path between the second pipe 23 and the third recovery pipe 71;

[0120] And / or, at least two of the fluidized beds 223 are connected in the path between the second pipe 23 and the third recovery pipe 71;

[0121] The connection can be in series or in parallel.

[0122] In this invention, such as Figure 3 and Figure 4 As 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 the path formed between the end of the second pipe 23 away from the second fluidized bed 21 and the end of the third recovery pipe 71 near the third preheater 7. Each fixed bed 222 or each fluidized bed 223 is provided with an air inlet 224 and a second air outlet 226. The air inlet 224 on adjacent fixed beds 222 or adjacent fluidized beds 223 is connected to the second air outlet 226, so that 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.

[0123] likeFigure 3 and Figure 4 As shown, each fixed bed 222 or each fluidized bed 223 has a first air outlet 225, and a third pipe is connected to the first air outlet 225 of 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 sequence 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 the second carrier gas. The second carrier gas enters the third pipe 24 along the first air outlet 225 of 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.

[0124] like Figure 1 As shown, when the heat storage unit 22 includes at least two fixed beds 222 and at least two fluidized beds 223, the multiple fixed beds 222 and multiple fluidized beds 223 can be connected in series on the path formed between the end of the second pipe 23 away from the second fluidized bed 21 and the end of the third recovery pipe 71 near the third preheater 7.

[0125] In one scenario, the air inlet 224 on the fixed bed 222 can be connected to the second pipe 23. The fixed bed 222 is connected to the fluidized bed 223 between adjacent fixed beds 222. Multiple fixed beds 222 and fluidized beds 223 are connected in series in this order. 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.

[0126] In one scenario, the air inlet 224 on the fluidized bed 223 can be connected to the second pipe 23. The fluidized bed 223 is connected to the adjacent fluidized bed 223 via a fixed bed 222. Multiple fixed beds 222 and fluidized beds 223 are connected in series in this order. 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.

[0127] In both of the above 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., and no specific limitation is made in the embodiments of the present invention;

[0128] When the number is not limited, there are cases where all fixed beds 222 are connected in series and then connected in series with fluidized beds 223, or all fluidized beds 223 are connected in series and then connected in series with fixed beds 222.

[0129] In this invention, such asFigure 3 and Figure 4 As shown, when multiple fixed beds 222 and / or multiple fluidized beds 223 are connected 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. After the preheated air passes through each fixed bed 222 or each fluidized bed 223 in sequence, it is heated to a high temperature state to obtain the second high temperature carrier gas.

[0130] In this invention, such as 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 the path formed between the end of the second pipe 23 away from the second fluidized bed 21 and the end of the third recovery pipe 71 near the third preheater 7. Each fixed bed 222 or each fluidized bed 223 is equipped with an air inlet 224, a first air outlet 225, and a second air outlet 226, as shown. Figure 5 and Figure 6 As shown, the second pipe 23 in the system is connected to the third pipe 24. Each inlet end 224 and each first outlet end 225 are connected to the second pipe 23, and each second outlet end 226 is connected to the third recovery pipe 71. Valves can be installed on the second pipe 23 and the third pipe 24 respectively to prevent the third high-temperature carrier gas from being delivered to the thermal 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 the 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 thermal energy application unit 3 through the third pipe 24.

[0131] like Figure 7 As shown, when the heat storage unit 22 includes at least two fixed beds 222 and at least two fluidized beds 223, the multiple fixed beds 222 and multiple fluidized beds 223 can be connected in parallel in sequence on the path formed between the end of the second pipe 23 away from the second fluidized bed 21 and the end of the third recovery pipe 71 near the third preheater 7.

[0132] In one scenario, multiple fixed beds 222 and multiple fluidized beds 223 are connected in parallel sequentially. At this time, the second pipe 23 and the third pipe 34 are connected. The air inlet 224 and the first air outlet 225 of 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. The third high-temperature carrier gas simultaneously enters each fixed bed 222 and each fluidized bed 223 to heat the heat carrier particles therein, thereby obtaining second high-temperature heat carrier particles in each fixed bed 222 and each fluidized bed 223. The second high-temperature carrier gas obtained in each fixed bed 222 and each fluidized bed 223 also flows smoothly into the third pipe 24 for use by the thermal energy application unit 3.

[0133] In one scenario, multiple fixed beds 222 and multiple fluidized beds can be connected in parallel, such as... Figure 7 As shown, the bed closest to the second fluidized bed is the fixed bed 222, followed by the fluidized bed 223, the fixed bed 222, etc.; 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., and is not specifically limited in this embodiment of the invention.

[0134] In this invention, such as 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 air 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 installed on the third recovery pipe 71 and the second recovery pipe 61 respectively to avoid mixed flow of carrier gas, 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 cooled in each fixed bed 222 and each fluidized bed 223 is discharged into the third preheater 7 through the third recovery pipe 71.

[0135] In this invention, by setting up a structure with multiple fixed beds 222 and / or multiple fluidized beds 223, and constructing a flexible and scalable thermal storage network in parallel or series connection, the overall performance of the system is improved. Preferably, the parallel connection of multiple beds enables linear growth in thermal storage capacity, making it more adaptable to the needs of industries of different scales.

[0136] In some embodiments, the heat carrier particles comprise silicon carbide;

[0137] The particle size of the heat carrier particles is between 0 μm and 200 μm.

[0138] In this invention, silicon carbide microparticles with a particle size between 0 μm and 200 μm are used as the heat transfer medium. This fully leverages the material's ultra-high temperature stability (withstanding temperatures above 1600 ℃), high thermal conductivity (120 W / m·K), and excellent thermal shock resistance, resulting in a significant improvement in the overall system performance. The larger heat exchange area of ​​the micron-sized particles increases the gas-solid heat exchange efficiency by more than 40%. The high-temperature resistance of silicon carbide extends the system's upper operating temperature limit to above 2000 ℃, better meeting the requirements of high-temperature processes such as metallurgy.

[0139] In some embodiments, see Figure 2 The heat storage unit 22 includes two types of heat carrier particles with different particle sizes;

[0140] 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.

[0141] In this invention, large heat carrier particles are stacked at the bottom of the heat storage unit 22, while small heat carrier particles are stacked on top of the large heat carrier particle layer. Since the small particles have a faster heat exchange rate with air, placing them on the large particle layer allows for faster acquisition of a second high-temperature carrier gas during heat release. Placing the large particles at the bottom of the heat storage unit 22 enables it to store more heat per unit time.

[0142] In this invention, smaller-diameter heat carrier particles are used in the first fluidized bed 11 and the second fluidized bed 21 because smaller particles have a larger specific surface area, which significantly accelerates the heating response speed. Larger-diameter particles are used in the heat storage unit 22, which can be regarded as a distribution plate, thereby dynamically adjusting the heating rate of the heat storage unit as needed, solving the contradiction between "high heat exchange efficiency" and "high heat storage density" in traditional systems.

[0143] In some embodiments, see Figure 1 and Figure 2 When the particle bed 221 includes the fixed bed 222, in the direction of the third recovery pipe 71 toward the second pipe 23, the particle size of the heat carrier particles in the fixed bed 222 is the same, or decreases sequentially.

[0144] When the heat storage unit 22 includes the fluidized bed 223, in the direction of 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 different particle sizes.

[0145] In this invention, when the particle bed 221 includes the fixed bed 222, the particle size of all the heat carrier particles can be set to be exactly the same, or multiple particle sizes of heat carrier particles can be selected and placed in descending order in the direction from the third recovery pipe 71 toward the second pipe 23.

[0146] In this invention, when the particle bed 221 includes a fluidized bed 223, the particle size of all heat carrier particles in the fluidized bed 223 can be set to be exactly the same;

[0147] Alternatively, two sizes of heat carrier particles can be set in the fluidized bed 223. The heat carrier particles near the third recovery pipe 71 can have a larger particle size than those near the second pipe 23. During system operation, the larger heat carrier particles act as a distribution plate for the fluidizing gas. After gas is introduced, the larger heat carrier particles remain stationary, while the smaller heat carrier particles are in a fluidized state. During the flow process, some smaller heat carrier particles are mixed into the larger ones, thereby improving heat transfer efficiency.

[0148] In some embodiments, see Figure 8 The method for zero-carbon high-temperature industrial processes based on green electricity includes:

[0149] Step S1: Introduce the air into the first fluidized bed 11 and use the power generation system 4 to supply power to the first fluidized bed 11 until the internal temperature of the first fluidized bed 11 reaches above 2000 ℃, thereby obtaining the first high-temperature heat carrier particles.

[0150] Step S2: Heat the air using the first high-temperature heat carrier particles to obtain the first high-temperature carrier gas, and supply the first high-temperature carrier gas to the thermal energy application unit 3 through the first pipeline 12.

[0151] Step S3: Simultaneously, the air is introduced into the second fluidized bed 21, and the power generation system 4 is used to supply power to the second fluidized bed 21 until the internal temperature of the second fluidized bed 21 reaches above 2000 ℃, thereby obtaining the third high-temperature heat carrier particles.

[0152] Step S4: Heat the air using the third high-temperature heat carrier particles to obtain a third high-temperature carrier gas, and supply 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 ℃, and obtain the second high-temperature heat carrier particles.

[0153] Step S5: At least when the first heating unit 1 stops supplying the first high-temperature carrier gas to the thermal 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 ℃. The second high-temperature carrier gas is then supplied to the thermal energy application unit 3 through the third pipe 24.

[0154] In this invention, in step S1, the apparent 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 working velocity of the air is not greater than 1.5 m / s.

[0155] In step S3, the apparent 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 working velocity of the air is not greater than 1.5 m / s.

[0156] The method provided by this invention directly drives the first fluidized bed 11 and the second fluidized bed 21 with green electricity, raising the temperature of the heat carrier particles to over 2000 °C. This breaks through the temperature limitations of traditional electric heating technology and can meet the extreme heat demands of ultra-high temperature industrial processes (such as special metallurgy and advanced material synthesis). The heat storage unit 22 also maintains a high-temperature storage of 2000 °C, ensuring that it can still output high-temperature carrier gas of ≥1500 °C when in standby mode, avoiding temperature fluctuations caused by energy switching in industrial processes. Especially when electricity is sufficient, the first heating unit 1 directly heats the thermal energy application unit 3, while the second fluidized bed 21 in the second heating unit 2 continuously heats the heat storage unit 22. When green electricity is insufficient, the heat storage unit 22 seamlessly switches to power supply, rapidly generating a second high-temperature carrier gas through pre-stored ultra-high temperature heat carrier particles, ensuring production continuity. This method relies entirely on green electricity, avoiding carbon emissions from fossil fuel combustion. Fluidized bed 223 technology, combined with heat carrier particles, is more suitable for ultra-high temperature scenarios than molten salt thermal storage and other solutions, and has lower maintenance costs and higher energy utilization efficiency.

[0157] To enable those skilled in the art to better understand the present invention, the following embodiments will be used to provide a detailed description of a high-temperature industrial zero-carbon system and method based on green electricity.

[0158] Example 1

[0159] See Figure 1 The diagram shows a high-temperature industrial zero-carbon system structure based on green electricity. The green electricity used in Example 1 is photovoltaic power.

[0160] (1) When there is sufficient light, the electric heating element 13 (the electric heating element 13 is a resistance heating) in the first fluidized bed 11 and the second fluidized bed 21 is connected to the power generation system 4 respectively. 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 ℃. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively. The apparent operating gas velocity of the air is 3 times the minimum fluidization velocity of the silicon carbide particles. After heating, the first high temperature heat carrier particles and the third high temperature heat carrier particles are obtained.

[0161] (2) Increase the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (working gas velocity not greater than 1.5 m / s), and heat the air using 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;

[0162] (3) The first high-temperature carrier gas is supplied to the thermal energy application unit 3 through the first pipeline 12. The exhaust gas discharged from the thermal 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 between the exhaust gas and the air. After the exhaust gas is cooled down, it is discharged from the first preheater 5. The air is heated to 300 ℃-500 ℃ and then transported to the first fluidized bed 11 to be further heated to above 2000 ℃ by the first high-temperature heat carrier particles. It is then supplied to the thermal energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source.

[0163] (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 ℃ and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 ℃ is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 ℃ and 500 ℃ is obtained and transported to the second fluidized bed 21 for recycling.

[0164] (5) When there is insufficient light, shut down the first fluidized bed 11 and stop supplying the first high-temperature carrier gas to the thermal energy application unit 3; introduce room temperature air into the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22, use the second high-temperature heat carrier particles to heat the air to obtain the second high-temperature carrier gas, and supply it to the thermal energy application unit 3 through the third pipeline 24 to ensure the continuous and stable operation of the thermal energy application unit 3;

[0165] (6) The exhaust gas discharged from the thermal energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, ambient temperature air is introduced into the second preheater 6 to exchange heat between the exhaust gas and the ambient temperature air. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for further heating and use. The cooled exhaust gas is discharged from the second preheater 6.

[0166] Example 2

[0167] See Figure 1 The diagram shows a high-temperature industrial zero-carbon system structure based on green electricity. In Example 2, the green electricity used is wind power.

[0168] (1) When there is sufficient wind, the electric heating element 13 (electric heating element 13 is resistance heating) in the first fluidized bed 11 and the second fluidized bed 21 is connected to the power generation system 4 respectively. 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 ℃. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively. The apparent operating air velocity of the air is 2.5 times the minimum fluidization velocity of the silicon carbide particles. After heating, the first high temperature heat carrier particles and the third high temperature heat carrier particles are obtained.

[0169] (2) Increase the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (working gas velocity not greater than 1.5 m / s), and heat the air using 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;

[0170] (3) The first high-temperature carrier gas is supplied to the thermal energy application unit 3 through the first pipeline 12. The exhaust gas discharged from the thermal 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 between the exhaust gas and the air. After the exhaust gas is cooled down, it is discharged from the first preheater 5. The air is heated to 300 ℃-500 ℃ and then transported to the first fluidized bed 11 to be further heated to above 2000 ℃ by the first high-temperature heat carrier particles. It is then supplied to the thermal energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source.

[0171] (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 ℃ and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 ℃ is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 ℃ and 500 ℃ is obtained and transported to the second fluidized bed 21 for recycling.

[0172] (5) When the wind is insufficient, shut down the first fluidized bed 11 and stop supplying the first high-temperature carrier gas to the thermal energy application unit 3; introduce room temperature air into the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22, use the second high-temperature heat carrier particles to heat the air to obtain the second high-temperature carrier gas, and supply it to the thermal energy application unit 3 through the third pipeline 24 to ensure the continuous and stable operation of the thermal energy application unit 3;

[0173] (6) The exhaust gas discharged from the thermal energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, ambient temperature air is introduced into the second preheater 6 to exchange heat between the exhaust gas and the ambient temperature air. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for further heating and use. The cooled exhaust gas is discharged from the second preheater 6.

[0174] Example 3

[0175] See Figure 1 Figure 1 The diagram shows a high-temperature industrial zero-carbon system structure based on green electricity. The green electricity used in Example 3 is photovoltaic power.

[0176] (1) When there is sufficient light, the electric heating element 13 (the electric heating element 13 is a resistance heating) in the first fluidized bed 11 and the second fluidized bed 21 is connected to the power generation system 4 respectively. 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 ℃. At the same time, air is introduced into the first fluidized bed 11 and the second fluidized bed 21 respectively. The apparent operating gas velocity of the air is 5 times the minimum fluidization velocity of the silicon carbide particles. After heating, the first high temperature heat carrier particles and the third high temperature heat carrier particles are obtained.

[0177] (2) Increase the air velocity in the first fluidized bed 11 and the second fluidized bed 21 to the working gas velocity (working gas velocity not greater than 1.5 m / s), and heat the air using 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;

[0178] (3) The first high-temperature carrier gas is supplied to the thermal energy application unit 3 through the first pipeline 12. The exhaust gas discharged from the thermal 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 between the exhaust gas and the air. After the exhaust gas is cooled down, it is discharged from the first preheater 5. The air is heated to 300 ℃-500 ℃ and then transported to the first fluidized bed 11 to be further heated to above 2000 ℃ by the first high-temperature heat carrier particles. It is then supplied to the thermal energy application unit 3 through the first pipeline 12 to continuously provide it with a high-temperature heat source.

[0179] (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 ℃ and discharged into the third preheater 7 through the third recovery pipe 71. At the same time, air with a temperature below 50 ℃ is introduced into the third preheater 7. After the two are mixed, air with a temperature between 300 ℃ and 500 ℃ is obtained and transported to the second fluidized bed 21 for recycling.

[0180] (5) When there is insufficient light, shut down the first fluidized bed 11 and stop supplying the first high-temperature carrier gas to the thermal energy application unit 3; introduce room temperature air into the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22, use the second high-temperature heat carrier particles to heat the air to obtain the second high-temperature carrier gas, and supply it to the thermal energy application unit 3 through the third pipeline 24 to ensure the continuous and stable operation of the thermal energy application unit 3;

[0181] (6) The exhaust gas discharged from the thermal energy application unit 3 is transported to the second preheater 6 through the second recovery pipe 61. At the same time, ambient temperature air is introduced into the second preheater 6 to exchange heat between the exhaust gas and the ambient temperature air. The heated air is transported to the fixed bed 222 and / or fluidized bed 223 of the heat storage unit 22 for further heating and use. The cooled exhaust gas is discharged from the second preheater 6.

[0182] In summary, this invention provides a high-temperature industrial zero-carbon system and method based on green electricity. By optimizing particulate materials and heat transfer structures, it achieves a thermal temperature exceeding 2000 °C, a heat transfer efficiency exceeding 90%, and significantly reduced operation and maintenance costs. This meets the high-temperature heat source requirements of high-temperature industrial processes and promotes their low-carbon transformation. This system will provide strong technical support for the green transformation of high-temperature industries and contribute to the green transformation of the global energy structure.

[0183] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0184] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0185] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0186] The above provides a detailed description of a high-temperature industrial zero-carbon system and method based on green electricity provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A high-temperature industrial zero-carbon system based on green electricity, characterized in that, The system includes: The unit consists of a first heating unit (1), a second heating unit (2), and a thermal energy application unit (3). The first heating unit (1) includes a first fluidized bed (11), and the first fluidized bed (11) is connected to the thermal energy application unit (3) through a first pipe (12). The second heating 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 by a second pipe (23), and the heat storage unit (22) and the thermal energy application unit (3) are connected by 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) contain heat carrier particles. The first heating unit (1) is configured to heat air using the 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 thermal energy application unit (3). The second heating unit (2) is configured to supply a second high-temperature carrier gas to the thermal energy application unit (3) when the first heating unit (1) stops supplying the first high-temperature carrier gas to the thermal energy application unit (3); The second high-temperature carrier gas is obtained by heating the air with the 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, characterized in that, 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 of the following working modes: resistance heating, electromagnetic induction heating, infrared heating or electrode heating; The electric heating element (13) is configured to connect to the power generation system (4) to convert electrical energy into heat energy to heat 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, characterized in that, The system also includes a first preheater (5) and a second preheater (6); The first preheater (5) is disposed on the first recovery pipe (51) between the first fluidized bed (11) and the thermal energy application unit (3), and the second preheater (6) is disposed on the second recovery pipe (61) between the heat storage unit (22) and the thermal energy application unit (3); The air inlet of the first preheater (5) and the air inlet of the second preheater (6) are located on the side closer to the thermal energy application unit (3), the air outlet of the first preheater (5) is located on the side closer to the first fluidized bed (11), and the air outlet of the second preheater (6) is located on the side closer to the heat storage unit (22). The first preheater (5) is configured to exchange heat between the exhaust gas discharged from the thermal energy application unit (3) and the air, and to deliver the heated air to the first fluidized bed (11); The second preheater (6) is configured to exchange heat between the exhaust gas discharged by the thermal energy application unit (3) and the air during the heat release phase, and to deliver 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, characterized in that, The system also includes a third preheater (7); The third preheater (7) is disposed on the third recovery pipe (71) between the heat storage unit (22) and the second fluidized bed (21); The air inlet of the third preheater (7) is located on the side close to the heat storage unit (22), and the air outlet of the third preheater (7) is located on the side close to the second fluidized bed (21). The third preheater (7) is configured to exchange heat between air discharged from the heat storage unit (22) at a temperature not lower than 300 °C and air at a temperature lower than 50 °C, and to transport the air obtained after mixing the two at a temperature between 300 °C and 500 °C to the second fluidized bed (21).

5. The high-temperature industrial zero-carbon system based on green electricity according to claim 4, characterized in that, The heat storage unit (22) includes a particle bed (221), which includes a fixed bed (222) and / or a fluidized bed (223); The particle bed (221) includes an air inlet (224), a first air outlet (225), and a second air outlet (226); The air inlet (224) is connected to the end of the second pipe (23) away from the second fluidized bed (21); The first gas outlet (225) is connected to the end of the third pipe (24) away from the thermal energy application unit (3), and the second gas outlet (226) is connected to the 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, characterized in that, The heat storage unit (22) includes at least two of the fixed beds (222) and / or two of the fluidized beds (223); At least two of the fixed beds (222) are connected in the path between the second pipe (23) and the third recovery pipe (71); And / or, at least two of the fluidized beds (223) are connected in the path between the second pipe (23) and the third recovery pipe (71); The connection can be in series or in parallel.

7. The high-temperature industrial zero-carbon system based on green electricity according to claim 1, 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, 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 that 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 of the third recovery pipe (71) toward the second pipe (23), the particle size of the heat carrier particles in the fixed bed (222) is the same, or decreases sequentially. When the heat storage unit (22) includes the fluidized bed (223), in the direction of 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 different particle sizes.

10. The method for a high-temperature industrial zero-carbon system based on green electricity according to any one of claims 1 to 9, characterized in that, The method includes: S1. 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 more than 2000 ℃, and the first high temperature heat carrier particles are obtained. S2. Heat the air using the first high-temperature heat carrier particles to obtain the first high-temperature carrier gas, and supply the first high-temperature carrier gas to the thermal energy application unit (3) through the first pipeline (12). S3. At the same time, the air is introduced into the second fluidized bed (21), and the power generation system (4) is used to supply power to the second fluidized bed (21) until the internal temperature of the second fluidized bed (21) reaches more than 2000 ℃, and the third high temperature heat carrier particles are obtained. S4. Heat the air using the third high-temperature heat carrier particles to obtain a third high-temperature carrier gas, and supply 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 ℃, and obtain the second high-temperature heat carrier particles. S5. When the first heating unit (1) stops supplying the first high-temperature carrier gas to the thermal 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 ℃. The second high-temperature carrier gas is then supplied to the thermal energy application unit (3) through the third pipeline (24).

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