Green electricity heat storage furnace and rotary kiln production line

Abstract

This invention discloses a green electric regenerative thermal radiant furnace and a rotary kiln production line. In a first operating mode, the truncated cone opens a first airflow path, allowing the rotary kiln exhaust gas to flow in through the inlet, sequentially pass through the regenerator, exchange heat with the regenerator, and then be discharged from the exhaust port, forming the first airflow path. In a second operating mode, the truncated cone moves horizontally to block the first airflow path, forcing the rotary kiln exhaust gas to sequentially pass through the regenerator, adsorption chamber, ceramic matrix material, and reflux assembly before being discharged from the exhaust port, forming a second airflow path. The ceramic matrix material adsorbs or desorbs carbon dioxide in the second airflow path. The beneficial effect of this invention is that by integrating an adsorption chamber filled with ceramic matrix material into the device and using a movable truncated cone to switch the airflow path, high-temperature exhaust gas can be directly flowed through the ceramic matrix material for CO2 chemical adsorption without significant cooling, effectively reducing the CO2 concentration in the exhaust gas and creating a better environment for the reaction inside the kiln.

Description

Technical Field

[0001] This invention relates to the field of regenerative thermal furnace technology, and more specifically, to a green electric regenerative thermal furnace and rotary kiln production line. Background Technology

[0002] Rotary kilns are core thermal equipment in the production of cement, metallurgy, chemical and other industries. During their operation, they generate a large amount of high-temperature waste gas (i.e., rotary kiln tail gas). Currently, there are the following technical deficiencies in the treatment of this tail gas and the utilization of its waste heat. In traditional processes, rotary kiln exhaust gas is directly discharged after simple dust removal, or used only for material drying in the low-temperature section. The high-temperature heat energy contained in the exhaust gas (usually 200°C to 300°C or even higher) is not efficiently recovered and used to improve the thermal efficiency inside the kiln. Although there are schemes to preheat materials using exhaust gas, the temperature increase of the exhaust gas is limited and its contribution to reducing production energy consumption is not significant. For certain specific processes (such as the firing of highly reactive lime), the carbon dioxide (CO2) that accumulates in the rotary kiln exhaust gas will inhibit the decomposition reaction of calcium carbonate in the kiln, resulting in a decrease in the reaction rate and an increase in energy consumption. Existing technologies lack effective means to directly control the CO2 concentration in the exhaust gas at high temperatures, and often can only dilute it by increasing ventilation or supplementing fresh air, which further causes heat loss. Summary of the Invention

[0003] To address the above deficiencies, this invention provides a green electric regenerative thermal furnace and a rotary kiln production line, thus solving the aforementioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The green electric thermal storage furnace includes an outer shell, an air inlet, and an exhaust outlet, with the air inlet and exhaust outlet respectively located at both ends of the outer shell. It also includes: Electric heating rod, heat storage body, refractory brick, adsorption chamber, ceramic matrix material, partition, frustum and reflux assembly; Refractory bricks are arranged on the inner wall of the shell, and the central area of ​​the refractory bricks forms a holding cavity; the heat storage body is set in the holding cavity; the electric heating rod passes through the heat storage body and the refractory bricks to heat the heat storage body; A partition divides the adsorption chamber into a U-shaped airflow loop; a ceramic matrix material is filled inside the adsorption chamber; a frustum is horizontally movable inside the outer shell to selectively block or open the first airflow path; The green electric thermal storage furnace has a first operating mode and a second operating mode: In the first working mode, the truncated cone opens the first airflow path, and the exhaust gas of the rotary kiln flows in from the air inlet, flows through the heat storage body in sequence, exchanges heat with the heat storage body and the temperature rises, and then is discharged from the exhaust port, forming the first airflow path. In the second working mode, the truncated cone moves horizontally to block the first airflow path, forcing the rotary kiln exhaust gas to flow in from the inlet, and then flow through the heat storage body, adsorption chamber, ceramic matrix material and reflux assembly in sequence before being discharged from the exhaust port, forming the second airflow path; the ceramic matrix material adsorbs or desorbs carbon dioxide in the second airflow path.

[0005] Furthermore, the reflux assembly includes a guide pipe installed between the exhaust port and the heat storage body. One end of the guide pipe is flared and the other end is cylindrical. A first hole is provided on the end of the guide pipe near the heat storage body. A flow guide ring is provided between the baffle and the guide pipe, and a flow guide cavity is formed inside the flow guide ring. A second hole is opened at the position of the straight section of the guide pipe. When the truncated cone blocks the first airflow path, the rotary kiln tail airflow passes through the heat storage body, the first hole, the flow guide cavity, the U-shaped airflow circuit, and the second hole, and is discharged from the guide pipe.

[0006] Furthermore, a refractory brick is provided between the second hole and the U-shaped airflow circuit. A guide hole for the rotary kiln tail gas flow is opened in the refractory brick, and a rectangular cavity for the movement of the truncated cone is opened in the refractory brick. A hydraulic rod is installed at one end of the outer shell. The telescopic end of the hydraulic rod is inserted into the outer shell. A T-shaped frame is installed at the telescopic end of the hydraulic rod. The center of the T-shaped frame is fixedly connected to the truncated cone. The slope of the side wall of the truncated cone is the same as the slope of the flared end of the guide tube.

[0007] Furthermore, a three-way valve is installed at one end of the exhaust port. When the rotary kiln tail gas flows through the first airflow path or the second airflow path, the ceramic matrix material adsorbs carbon dioxide in the second airflow path, and the three-way valve opens to one side, allowing the rotary kiln tail gas to circulate. When the rotary kiln tail gas flows through the second gas flow path and the ceramic matrix material desorbs carbon dioxide in the second gas flow path, the three-way valve opens to the other side to release carbon dioxide.

[0008] Furthermore, the heat storage body is a heat storage ball or a heat storage brick.

[0009] Furthermore, the ceramic matrix material is a calcium-based ceramic material, and the reaction equation for the calcium-based ceramic material is as follows: When the temperature of the ceramic matrix material and the rotary kiln exhaust gas is about 600–750℃, CaO reacts with CO2 to form CaCO3, and the ceramic matrix material achieves CO2 adsorption. In industrial flue gas (which usually contains 10–30% CO2), the optimal carbonation temperature is usually 650–700℃. When the temperature of the ceramic matrix material and the rotary kiln exhaust gas is about 850–950℃, CaCO3 decomposes into CaO and pure CO2, and the ceramic matrix material achieves CO2 desorption.

[0010] The ceramic matrix material is a lithium-based ceramic material, and the reaction equation for lithium-based ceramic materials is: When the temperature of the ceramic matrix material and the rotary kiln exhaust gas is approximately 550–650℃, the Li in the Li4SiO4 structure...+ and O 2- The gas migrates outward and combines with CO2 to form Li2CO3, thus adsorbing CO2. When the temperature of the ceramic matrix material and the rotary kiln exhaust gas is about 700–850℃, Li2CO3 reacts with Li2SiO3 again to form Li4SiO4 and releases CO2, thus desorbing CO2.

[0011] By selecting different types of ceramic-based materials (such as calcium-based materials for higher temperature windows and lithium-based materials for medium temperature windows) and combining them with the flow direction control of a three-way valve, this device can adapt to the tail gas temperature, CO2 concentration and treatment requirements of different rotary kilns. It can be used simply as a green electric thermal storage heating device, as a CO2 concentration control device, or for producing high-concentration CO2 by-products. The process flow is flexible and the operation is highly adaptable.

[0012] Furthermore, the green electric regenerative thermal furnace is installed at the exhaust end of the rotary kiln production line to treat the rotary kiln tail gas.

[0013] The beneficial effects of this invention are as follows: by setting up electric heating rods and a heat storage body, off-peak electricity or low-cost green electricity (such as wind and solar power) can be used to heat the heat storage body; when the exhaust gas of the rotary kiln passes through the heat storage body, it can be rapidly heated to a maximum of 1300°C, and the heated high-temperature gas is directly returned to the rotary kiln, realizing the closed-loop recycling of thermal energy; this not only solves the problem of green electricity consumption, but also significantly improves the thermal efficiency of the rotary kiln and reduces fossil fuel consumption; By integrating an adsorption chamber filled with ceramic matrix material into the device and using a movable truncated cone to switch the airflow path, high-temperature exhaust gas can be directly flowed through the ceramic matrix material for CO2 chemical adsorption (carbonation reaction) without significant cooling. This effectively reduces the CO2 concentration in the exhaust gas and creates a better environment for the reaction inside the kiln. When the material is saturated with adsorption, the temperature can be changed by adjusting the power of the electric heating rod (e.g., raising it to the desorption temperature). This allows for in-situ desorption of CO2 within the same device and the generation of a high-concentration CO2 gas flow, facilitating subsequent resource utilization or storage. This invention integrates heat storage and heating functions with CO2 adsorption / desorption functions into the same housing; by moving the truncated cone horizontally, it can flexibly switch between "heating-only circulation mode" and "heating + adsorption / desorption mode" without the need for an additional complex external pipeline switching system; the U-shaped airflow loop design greatly increases the contact path between the ceramic matrix material and the exhaust gas, improving adsorption efficiency, while making the overall structure compact, occupying a small area, and easy to modify and install on existing rotary kiln production lines. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the green electric regenerative furnace and rotary kiln production line described in this invention; Figure 2 yes Figure 1 Schematic diagram of the mid-longitudinal section; Figure 3 yes Figure 2 A frontal view diagram; Figure 4 yes Figure 3 A partial schematic diagram; Figure 5 A schematic diagram of a frustum. Figure 1 ; Figure 6 A schematic diagram of a frustum. Figure 2 ; In the diagram, 1. Outer shell; 2. Air inlet; 3. Exhaust outlet; 4. Electric heating rod; 5. Heat storage body; 6. Refractory brick; 7. Adsorption chamber; 8. Ceramic matrix material; 9. Partition plate; 10. Frustum; 11. Holding cavity; 12. U-shaped airflow circuit; 21. Guide tube; 22. First hole; 23. Guide ring; 24. Guide cavity; 25. Second hole; 31. Guide hole; 32. Rectangular cavity; 33. Hydraulic rod; 34. T-shaped frame; 41. Three-way valve. Detailed Implementation

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] This application provides a green electric thermal storage furnace; please refer to [reference needed]. Figures 1-6 The system includes a housing 1, an air inlet 2, and an exhaust outlet 3, with the air inlet 2 and exhaust outlet 3 respectively located at both ends of the housing 1. It also includes: 4. Electric heating rod, 5. Heat storage body, 6. Refractory brick, 7. Adsorption chamber, 8. Ceramic matrix material, 9. Baffle plate, 10. Frustum, and reflux assembly; Refractory bricks 6 are arranged on the inner wall of the outer shell 1, and the central area of ​​the refractory bricks 6 forms a holding cavity 11; the heat storage body 5 is disposed in the holding cavity 11; the electric heating rod 4 passes through the heat storage body 5 and the refractory bricks 6 and is used to heat the heat storage body 5. The partition 9 divides the adsorption chamber 7 into a U-shaped airflow circuit 12; the ceramic matrix material 8 is filled in the adsorption chamber 7; the frustum 10 is horizontally movable inside the outer shell 1 and is used to selectively block or open the first airflow path. The green electric thermal storage furnace has a first operating mode and a second operating mode: In the first working mode, the truncated cone 10 opens the first airflow path, and the rotary kiln tail gas flows in from the air inlet 2, flows through the heat storage body 5 in sequence, and exchanges heat with the heat storage body 5 to increase the temperature, and then is discharged from the exhaust port 3 to form the first airflow path. In the second working mode, the truncated cone 10 moves horizontally to block the first airflow path, forcing the rotary kiln exhaust gas to flow in from the air inlet 2, and then flow through the heat storage body 5, the adsorption chamber 7, the ceramic matrix material 8 and the reflux assembly in sequence before being discharged from the exhaust port 3, forming the second airflow path; the ceramic matrix material 8 adsorbs or desorbs carbon dioxide in the second airflow path.

[0017] In practical applications, the air inlet 2 is connected to the exhaust end of the rotary kiln, the exhaust gas temperature of the rotary kiln is 200℃, the exhaust port 3 is connected to the air inlet of the rotary kiln, and external green electricity (wind power, photovoltaic power, etc.) supplies power to the electric heating rod 4. When the electric heating rod 4 is working, it heats the heat storage body 5. When the exhaust gas of the rotary kiln flows through the heat storage body 5, it exchanges heat with the heat storage body 5, heating the exhaust gas of the rotary kiln to 1300℃ and flowing back into the rotary kiln, which facilitates the heating of lime by the rotary kiln. The refractory bricks 6 serve to keep the heat insulated and heat-insulating; the central area of ​​the refractory bricks 6 forms a cavity 11; the heat storage body 5 is placed inside the cavity 11; the electric heating rod 4 passes through the heat storage body 5 and the refractory bricks 6 to heat the heat storage body 5, which can effectively prevent heat loss. Step 1; In the first working mode, the truncated cone 10 opens the first airflow path. At this time, the rotary kiln tail gas does not flow through the U-shaped airflow circuit 12. The rotary kiln tail gas flows in from the air inlet 2, flows through the heat storage body 5 in sequence, and exchanges heat with the heat storage body 5 to increase the temperature. Then it is discharged from the exhaust port 3, forming a cycle with the gas flow in the rotary kiln. Step Two; When the carbon dioxide concentration in the rotary kiln tail gas exceeds a certain value (high carbon dioxide concentration is not conducive to the chemical reaction of materials in the rotary kiln), the truncated cone 10 is controlled to move horizontally to block the first airflow path, forcing the rotary kiln tail gas to flow in from the inlet 2, and then flow through the heat storage body 5, adsorption chamber 7, ceramic matrix material 8 and reflux assembly before being discharged from the exhaust port 3. During the above process, the ceramic matrix material 8 is kept at a certain temperature and adsorbs carbon dioxide in the second airflow path to avoid excessive carbon dioxide concentration. Step 3; When the adsorption of carbon dioxide by the ceramic matrix material 8 reaches saturation, the power of the electric heating rod 4 is controlled to change so that the ceramic matrix material 8 is kept at another temperature value, and the carbon dioxide separates from the ceramic matrix material 8, thus achieving desorption.

[0018] Reference Figures 1 to 6The reflux assembly includes a guide pipe 21 installed between the exhaust port 3 and the heat storage body 5. One end of the guide pipe 21 is flared and the other end is cylindrical. A first hole 22 is provided on the end of the guide pipe 21 near the heat storage body 5. A guide ring 23 is provided between the partition plate 9 and the guide pipe 21. A guide cavity 24 is formed inside the guide ring 23. A second hole 25 is opened at the position of the straight section of the guide pipe 21. When the frustum 10 blocks the first airflow path, the rotary kiln tail airflow passes through the heat storage body 5, the first hole 22, the guide cavity 24, the U-shaped airflow circuit 12, and the second hole 25, and is discharged from the guide pipe 21.

[0019] In practical applications, the setting of the guide pipe 21 ensures a stable airflow path between the heat storage body 5 and the exhaust port 3. The setting of the first hole 22 facilitates the flow of the rotary kiln tail gas to the U-shaped airflow circuit 12. The setting of the guide ring 23 enables the rotary kiln tail gas to form a closed return path. When carbon dioxide needs to be adsorbed or desorbed, the truncated cone 10 blocks the first airflow path, and the rotary kiln tail airflow passes through the heat storage body 5, the first hole 22, the guide cavity 24, the U-shaped airflow circuit 12, and the second hole 25, and is discharged from the guide pipe 21.

[0020] Reference Figures 1 to 6 A refractory brick 6 is provided between the second hole 25 and the U-shaped airflow circuit 12. A guide hole 31 is opened in the refractory brick 6 for the rotary kiln tail gas flow. A rectangular cavity 32 is opened in the refractory brick 6 for the frustum 10 to move. A hydraulic rod 33 is installed at one end of the outer shell 1. The telescopic end of the hydraulic rod 33 is inserted into the outer shell 1. A T-shaped frame 34 is installed at the telescopic end of the hydraulic rod 33. The center of the T-shaped frame 34 is fixedly connected to the frustum 10. The slope of the side wall of the frustum 10 is the same as the slope of the flared end of the guide tube 21.

[0021] In practical applications, the hydraulic rod 33 extends and retracts to move the T-shaped frame 34 and the frustum 10 in the horizontal direction, thereby selectively blocking or opening the first airflow path; by setting the slope of the side wall of the frustum 10 to be the same as the slope of the flared end of the guide tube 21, the sealing between the frustum 10 and the guide tube 21 is better; the rectangular cavity 32 allows the T-shaped frame 34 to move horizontally.

[0022] Reference Figures 1 to 6 A three-way valve 41 is installed at one end of the exhaust port 3. When the rotary kiln tail gas flows through the first airflow path or the second airflow path, the ceramic matrix material 8 adsorbs carbon dioxide in the second airflow path. The three-way valve 41 opens to one side, and the rotary kiln tail gas can be circulated. When the rotary kiln tail gas flows through the second gas flow path and the ceramic matrix material 8 desorbs carbon dioxide in the second gas flow path, the three-way valve 41 opens to the other side to release carbon dioxide.

[0023] In practical applications, the three-way valve 41 is designed to direct the tail gas flow of the heated rotary kiln to different destinations. When the rotary kiln tail gas flows through the first or second airflow path, the ceramic matrix material 8 adsorbs carbon dioxide in the second airflow path, the three-way valve 41 opens to one side, and the rotary kiln tail gas can be circulated. When the rotary kiln tail gas flows through the second gas flow path and the ceramic matrix material 8 desorbs carbon dioxide in the second gas flow path, the three-way valve 41 opens to the other side to release carbon dioxide.

[0024] Reference Figures 1 to 6 The heat storage body 5 is a heat storage ball or a heat storage brick.

[0025] In practical applications, when using heat storage balls, the surface area of ​​the heat storage balls is larger and the heat exchange efficiency is higher; when using heat storage bricks, their structure is stronger.

[0026] Example 1 of ceramic matrix material 8, refer to Figures 1 to 6 Ceramic matrix material 8 is a calcium-based ceramic material, and the reaction equation for calcium-based ceramic materials is as follows: When the temperature of the ceramic matrix material 8 and the rotary kiln exhaust gas is about 600–750℃, CaO reacts with CO2 to form CaCO3, and the ceramic matrix material 8 achieves CO2 adsorption. In industrial flue gas (which usually contains 10–30% CO2), the optimal carbonation temperature is usually 650–700℃. When the temperature of the ceramic matrix material 8 and the rotary kiln exhaust gas is about 850–950℃, CaCO3 decomposes into CaO and pure CO2, and the ceramic matrix material 8 achieves CO2 desorption.

[0027] In practical applications, depending on the different properties of different materials, when the temperature of the ceramic matrix material 8 and the rotary kiln exhaust gas is about 600–750℃, CaO reacts with CO2 to generate CaCO3, and the ceramic matrix material 8 achieves the adsorption of CO2. After a certain period of time, the adsorption of CO2 reaches saturation. The temperature of the ceramic matrix material 8 and the rotary kiln tail gas is controlled at 850–950℃. At this time, CaO reacts with CO2 to generate CaCO3, and the ceramic matrix material 8 achieves desorption of CO2.

[0028] Example 2 of ceramic-based material 8, refer to Figures 1 to 6 Ceramic-based material 8 is a lithium-based ceramic material, and the reaction equation for lithium-based ceramic materials is: When the temperature of the ceramic matrix material 8 and the rotary kiln exhaust gas is approximately 550–650℃, the Li in the Li4SiO4 structure... + and O 2-The gas migrates outward and combines with CO2 to form Li2CO3, thus adsorbing CO2. When the temperature of the ceramic matrix material 8 and the rotary kiln tail gas is about 700–850℃, Li2CO3 reacts with Li2SiO3 again to form Li4SiO4 and releases CO2, thus desorbing CO2.

[0029] In practical applications, to adapt to different working conditions, lithium-based ceramic materials can be used as CO2 adsorption materials. When the temperature of the ceramic material 8 and the rotary kiln exhaust gas is approximately 550–650℃, the Li in the Li4SiO4 structure... + and O 2- It migrates outward and combines with CO2 to form Li2CO3, thus achieving the adsorption of CO2; When the temperature of the ceramic matrix material 8 and the rotary kiln exhaust gas is about 700–850℃, Li2CO3 and Li2SiO3 react again to generate Li4SiO4 and release CO2, thus achieving CO2 desorption; the green electric regenerative furnace is installed at the exhaust end of the rotary kiln production line to treat the rotary kiln exhaust gas.

Claims

1. A green electric thermal storage furnace, comprising an outer shell (1), an air inlet (2), and an exhaust outlet (3), wherein the air inlet (2) and the exhaust outlet (3) are respectively disposed at both ends of the outer shell (1), characterized in that, Also includes: Electric heating rod (4), heat storage body (5), refractory brick (6), adsorption chamber (7), ceramic matrix material (8), partition (9), frustum (10) and reflux assembly; Refractory bricks (6) are arranged on the inner wall of the outer shell (1), and the central area of ​​the refractory bricks (6) forms a holding cavity (11); the heat storage body (5) is set in the holding cavity (11); the electric heating rod (4) penetrates the heat storage body (5) and the refractory bricks (6) to heat the heat storage body (5); The partition (9) divides the adsorption chamber (7) into a U-shaped airflow circuit (12); the ceramic matrix material (8) is filled in the adsorption chamber (7); the frustum (10) is horizontally movable in the outer shell (1) for selectively blocking or opening the first airflow path; The green electric thermal storage furnace has a first operating mode and a second operating mode: In the first working mode, the truncated cone (10) opens the first airflow path, and the rotary kiln tail gas flows in from the air inlet (2), flows through the heat storage body (5) in sequence, and exchanges heat with the heat storage body (5) to increase the temperature, and then is discharged from the exhaust port (3) to form the first airflow path; In the second working mode, the truncated cone (10) moves horizontally to block the first airflow path, forcing the rotary kiln tail gas to flow in from the air inlet (2), and then flow through the heat storage body (5), adsorption chamber (7), ceramic matrix material (8) and reflux assembly in sequence before being discharged from the exhaust port (3), forming the second airflow path; the ceramic matrix material (8) adsorbs or desorbs carbon dioxide in the second airflow path.

2. The green electric thermal storage furnace according to claim 1, characterized in that, The reflux assembly includes a guide pipe (21) installed between the exhaust port (3) and the heat storage body (5). One end of the guide pipe (21) is flared and the other end is cylindrical. A first hole (22) is provided on the end of the guide pipe (21) near the heat storage body (5). A guide ring (23) is provided between the partition plate (9) and the guide pipe (21). A guide cavity (24) is formed inside the guide ring (23). A second hole (25) is opened at the position of the straight section on the guide pipe (21). When the truncated cone (10) blocks the first airflow path, the rotary kiln tail airflow passes through the heat storage body (5), the first hole (22), the guide cavity (24), the U-shaped airflow circuit (12), and the second hole (25) and is discharged from the guide pipe (21).

3. The green electric thermal storage furnace according to claim 2, characterized in that, A refractory brick (6) is provided between the second hole (25) and the U-shaped airflow circuit (12). A guide hole (31) for the rotary kiln tail gas flow is opened in the refractory brick (6). A rectangular cavity (32) for the frustum (10) to move is opened in the refractory brick (6). A hydraulic rod (33) is installed at one end of the outer shell (1). The telescopic end of the hydraulic rod (33) is inserted into the outer shell (1). A T-shaped frame (34) is installed at the telescopic end of the hydraulic rod (33). The center of the T-shaped frame (34) is fixedly connected to the frustum (10). The slope of the side wall of the frustum (10) is the same as the slope of the flared end of the guide tube (21).

4. The green electric thermal storage furnace according to claim 3, characterized in that, A three-way valve (41) is installed at one end of the exhaust port (3). When the rotary kiln tail gas flows through the first airflow path or the second airflow path, the ceramic matrix material (8) adsorbs carbon dioxide in the second airflow path. The three-way valve (41) opens to one side, and the rotary kiln tail gas can be circulated. When the rotary kiln tail gas flows through the ceramic matrix material (8) in the second gas flow path and desorbs carbon dioxide in the second gas flow path, the three-way valve (41) opens to the other side to release carbon dioxide.

5. The green electric thermal storage furnace according to claim 4, characterized in that, The heat storage body (5) is a heat storage ball or a heat storage brick.

6. The green electric thermal storage furnace according to claim 5, characterized in that, The ceramic matrix material (8) is a calcium-based ceramic material, and the reaction equation for the calcium-based ceramic material is as follows: When the temperature of the ceramic matrix material (8) and the rotary kiln tail gas is about 600–750℃, CaO reacts with CO2 to generate CaCO3, and the ceramic matrix material (8) achieves adsorption of CO2. In industrial flue gas (which usually contains 10–30% CO2), the optimal carbonation temperature is usually 650–700℃. When the temperature of the ceramic matrix material (8) and the rotary kiln tail gas is about 850–950℃, CaCO3 decomposes into CaO and pure CO2, and the ceramic matrix material (8) achieves desorption of CO2.

7. The green electric thermal storage furnace according to claim 5, characterized in that, The ceramic-based material (8) is a lithium-based ceramic material, and the reaction equation for the lithium-based ceramic material is as follows: When the temperature of the ceramic matrix material (8) and the rotary kiln exhaust gas is approximately 550–650℃, the Li in the Li4SiO4 structure... + and O 2- It migrates outward and combines with CO2 to form Li2CO3, thus achieving the adsorption of CO2; when the temperature of the ceramic matrix material (8) and the rotary kiln tail gas is about 700–850℃, Li2CO3 reacts with Li2SiO3 again to form Li4SiO4 and releases CO2, thus achieving the desorption of CO2.

8. A rotary kiln production line, including the green electric regenerative furnace as described in claims 1-7, characterized in that, The green electric regenerative thermal furnace is installed at the exhaust end of the rotary kiln production line to treat the exhaust gas from the rotary kiln.

Images