Roasting system for prebaked anode

Abstract

The invention provides a roasting system for a prebaked anode, which comprises M roasting furnace chambers communicated with one another, M is greater than or equal to 14 and is used for accommodating anode green bodies; the movable heating equipment comprises N combustion frames, the N combustion frames are arranged corresponding to N adjacent roasting furnace chambers in the M roasting furnace chambers, the combustion frames are used for combusting anode green bodies located in the roasting furnace chambers, and N is larger than or equal to 4; wherein the N combustion frames move in the preset moving direction according to the preset furnace moving period, heating flue gas generated during combustion of the combustion frames flows in the roasting furnace chamber in the preset moving direction, and the combustion frames and the heating flue gas form a heating area of the movable heating equipment. The number of the combustion frames in the roasting system is increased to four or more, so that the heat preservation time of the anode green body in the roasting system is prolonged, the heating rate is reduced, residual volatile components in the prebaked anode are reduced, the conductivity is enhanced, the resistivity is reduced, and the prebaked anode meeting the index requirement of the high-current-density anode is produced.

Description

Technical Field

[0001] This application relates to the field of prebaked anode technology, and in particular to a calcination system for prebaked anodes. Background Technology

[0002] The industrial production of metallic aluminum mainly employs electrolysis, which involves producing metallic aluminum through electrochemical reactions within an electrolytic cell. In this process, the prebaked anode, as the core component of the electrolytic cell, plays a crucial role in conducting electricity and participating in the electrochemical reaction. Its physicochemical properties directly affect electrolysis efficiency and product quality, especially the resistivity, which plays a key role in the energy consumption and current efficiency of the aluminum electrolysis process.

[0003] The production of prebaked anodes typically involves three main processes: calcination, forming, and baking. Among these, the baking process is the key step determining the final performance of the anode. During baking, a series of physicochemical changes occur inside the anode, such as the removal of volatiles, structural densification, and geometric stabilization. A reasonable baking method and heating profile have a significant impact on reducing resistivity, increasing apparent density, and improving overall conductivity. However, the baking process is complex, and variations in factors such as temperature control and heating rate can lead to significant differences in the performance of the final product.

[0004] However, with the increase in electrolysis current density, prebaked anodes must possess higher conductivity and apparent density, leading to the development of high current density anodes (resistivity ≤ 54 μΩ·m, apparent density ≥ 1.59 g / cm³). 3 The transformation of existing prebaked anodes is limited by the calcination system, making it difficult to meet the performance requirements of high current density anodes. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this application provides a calcination system for prebaked anodes. The technical problem to be solved by this application is achieved through the following technical solution: A calcination system for prebaked anodes, comprising: M interconnected baking chambers, used to accommodate anode green billets, M≥14; A mobile heating device includes N combustion racks, which are set up in relation to N adjacent baking chambers in M ​​baking chambers. The combustion racks are used to burn the anode green blanks located in the baking chambers, and N≥4. Among them, N combustion racks move along a preset moving direction at a preset furnace transfer cycle, and the heating flue gas in the combustion of the combustion racks flows between the roasting furnace chambers along the preset moving direction. The combustion racks and the heating flue gas form the heating zone of the mobile heating equipment.

[0006] In one feasible manner, the N combustion frames include a leading combustion frame and N-1 following combustion frames, with the following combustion frames moving along a preset moving direction following the leading combustion frame; Portable heating equipment also includes: The temperature and pressure measuring frame is located on the side of the first combustion frame away from N-1 following combustion frames; The exhaust frame is located on the side of the temperature and pressure measuring frame away from the first combustion frame, and is used to guide the heating flue gas generated by the combustion frame to flow in the roasting furnace chamber along a preset moving direction.

[0007] In one feasible approach, the heating zone of the mobile heating device controls the temperature of the roasting chamber covered by the heating zone according to a preset temperature curve; The preset temperature curve includes: a continuous first heating section, a second heating section, a third heating section, a fourth heating section, and a heat preservation section; Among them, the heating rate of the first heating stage > the heating rate of the third heating stage > the heating rate of the second heating stage > the heating rate of the fourth heating stage. The heating rate in the first heating stage is <10℃ / h; The starting temperature of the fourth heating stage is ≥1050℃; The insulation period should last ≥54 hours.

[0008] In one feasible approach, the holding time is 2-X preset furnace transfer cycles, and the temperature of the holding section is 1150~1200℃, where X=0.3~0.4.

[0009] In one feasible approach, the length of the heating zone is 7 calcination chambers; the time for the preset temperature profile is 7 preset furnace transfer cycles; The heating rate of the first heating stage is 6.5~9.7℃ / h, and the time of the first heating stage is one preset furnace transfer cycle; The heating rate of the second heating stage is 2.1~3.8℃ / h, and the duration of the second heating stage is 2 preset furnace transfer cycles; The heating rate of the third heating stage is 3.5~6.5℃ / h, and the time of the third heating stage is 2 preset furnace transfer cycles; The heating rate of the fourth heating stage is 1.5~1.8℃ / h, and the time of the fourth heating stage is X preset furnace transfer cycles.

[0010] In one feasible approach, the initial temperature of the first heating stage is 230~300℃.

[0011] In one feasible embodiment, the device further includes a mobile cooling device positioned after the mobile heating device along a preset moving direction, which moves along the preset moving direction to cool the anode green billet after combustion.

[0012] In one feasible implementation, N combustion racks move along a preset moving direction at a preset furnace transfer cycle, including: At each preset furnace transfer cycle, N combustion racks move one roasting furnace chamber along the preset moving direction.

[0013] In one feasible approach, the preset furnace transfer cycle is 34 hours.

[0014] In one feasible approach, M is 54 to 70.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This application increases the number of combustion racks in the calcination system to four or more, thereby increasing the holding time of the anode green in the calcination system and reducing the heating rate. This allows for more complete decomposition of the asphalt in the prebaked anode, reduces the residual volatiles in the prebaked anode, lowers the porosity, increases the apparent density, and thus enhances the conductivity and lowers the resistivity, producing a prebaked anode that meets the requirements of high current density anodes. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of a calcination system for a prebaked anode according to an embodiment of this application is shown; Figure 2 A schematic diagram of a preset temperature curve according to an embodiment of this application is shown. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments and application scenarios. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Unless otherwise specified, the following embodiments and features can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present application are within the scope of protection of the present application.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] Please see Figure 1 , Figure 1 A schematic diagram of a calcination system for a prebaked anode, according to an embodiment of this application, is shown.

[0020] This application provides a calcination system for prebaked anodes, comprising: M interconnected calcination chambers for accommodating anode green blanks, M≥14; and a mobile heating device comprising N combustion racks, the N combustion racks being arranged corresponding to adjacent N calcination chambers in the M calcination chambers, the combustion racks being used to burn the anode green blanks located in the calcination chambers, N≥4; wherein, the N combustion racks move along a preset moving direction at a preset furnace moving cycle, and the heating flue gas from the combustion of the combustion racks flows between the calcination chambers along the preset moving direction, the combustion racks and the heating flue gas forming the heating zone of the mobile heating device.

[0021] The calcination system of this application enhances the conductivity of prebaked anodes. Specifically, prebaked anodes are typically composed of petroleum coke and pitch binder, and the holding time during the calcination process significantly affects the structure and performance of the prebaked anode. This application increases the number of combustion racks in the calcination system to four or more, thereby increasing the holding time of the anode green in the calcination system and reducing the heating rate. This allows for more complete decomposition of the pitch in the prebaked anode, reducing residual volatiles (tar, hydrocarbon gases), decreasing porosity, increasing apparent density, and thus enhancing conductivity and reducing resistivity, producing prebaked anodes that meet the requirements for high current density anodes.

[0022] In this application, the heating zone of the mobile heating device controls the temperature of the roasting furnace chamber covered by the heating zone according to a preset temperature curve. Furthermore, the preset temperature curve includes: a continuous first heating section, a second heating section, a third heating section, a fourth heating section, and a holding section; wherein the heating rate of the first heating section is greater than the heating rate of the third heating section, which is greater than the heating rate of the second heating section, which is greater than the heating rate of the fourth heating section; the heating rate of the first heating section is less than 10℃ / h; the initial temperature of the fourth heating section is greater than or equal to 1050℃; and the holding time is greater than or equal to 54h.

[0023] In this application, the holding time is 2-X preset furnace transfer cycles, and the temperature of the holding section is 1150~1200℃, where X=0.3~0.4.

[0024] Specifically, this application adjusts the insulation time when the temperature of the insulation section is 1150℃, and the relationship between the insulation time and the conductivity of the prebaked anode is shown in Table 1.

[0025] Table 1

[0026] As can be seen from the data in Table 1, the holding time, resistivity, and apparent density of the prebaked anode are directly proportional. That is, as the holding time increases, the resistivity of the prebaked anode decreases and the apparent density increases. Therefore, the holding time in this embodiment is controlled to be more than 54 hours.

[0027] In this application, the first and third heating stages are rapid heating stages, the second heating stage is a slow heating stage, and the fourth heating stage uses an even slower heating rate to raise the temperature to the final baking temperature of the holding stage. Different heating rates in different stages allow the anode green blank to fully complete reactions such as tar volatilization, cracking, and structural rearrangement at each stage, avoiding internal cracks, spalling, or increased porosity caused by excessively rapid heating, thus ensuring the structural integrity of the prebaked anode. However, because the high apparent density of the anode green blank results in high density and low porosity (≤18%), it has poor thermal conductivity. Therefore, this application uses four or more combustion racks to extend the holding time while reducing the heating rate, controlling the heating rate of the first heating stage to <10℃ / h. This reduces internal thermal stress in the carbon block, preventing cracking, and provides more time for volatile matter to escape, allowing sufficient time for volatile matter generated from asphalt decomposition to escape, avoiding structural damage caused by internal pressure accumulation. This reduces the crack rate while improving the electrical performance of the prebaked anode.

[0028] In this application, N combustion racks move along a preset moving direction at a preset furnace transfer cycle, including: At each preset furnace transfer cycle, N combustion racks move one roasting furnace chamber along the preset moving direction.

[0029] In some embodiments, the N combustion racks include a leading combustion rack and N-1 following combustion racks, the following combustion racks moving along a preset moving direction following the leading combustion rack. The mobile heating device further includes: a temperature and pressure measuring frame, located on the side of the leading combustion rack away from the N-1 following combustion racks; and a flue gas exhaust frame, located on the side of the temperature and pressure measuring frame away from the leading combustion rack, for guiding the heating flue gas generated by the combustion racks to flow along the preset moving direction between the roasting chambers.

[0030] In some embodiments, the calcination system further includes: a mobile cooling device, which is positioned after the mobile heating device along a preset moving direction and moves along the preset moving direction with the mobile heating device, for cooling the calcined anode green blank.

[0031] In some embodiments, M is 54~70, N is 4, the length of the heating zone of the mobile heating device is 7 roasting chambers, and the preset furnace relocation cycle is 34 hours. Figure 1 As shown, the heating zone of the mobile heating equipment covers the following roasting chambers: continuous roasting chamber 1P, roasting chamber 2P, roasting chamber 3P, roasting chamber 4P, roasting chamber 5P, roasting chamber 6P, and roasting chamber 7P. Four combustion racks, HR1, HR2, HR3, and HR4, are respectively located in roasting chambers 4P, 5P, 6P, and 7P. The temperature and pressure measuring rack TPR is located in roasting chamber 2P, and the exhaust rack ER is located in roasting chamber 1P. The mobile cooling equipment includes: a zero-pressure frame ZPR, a blower frame BR, and a cooling frame CR. The cooling area of ​​the mobile cooling equipment covers the following calcining chambers: calcining chamber 1C, calcining chamber 2C, calcining chamber 3C, calcining chamber 4C, calcining chamber 5C, calcining chamber 6C, and calcining chamber 7C. Among them, calcining chamber 1C and calcining chamber 7C are adjacent to each other. The zero-pressure frame ZPR is located in calcining chamber 1C, the blower frame BR is located in calcining chamber 4C, and the cooling frame CR is located between calcining chamber 6C and calcining chamber 7C.

[0032] In some embodiments, the time corresponding to the preset temperature curve is 7 preset furnace transfer cycles; the starting temperature of the first heating stage is 230~300℃, the heating rate of the first heating stage is 6.5~9.7℃ / h, and the time of the first heating stage is 1 preset furnace transfer cycle; the heating rate of the second heating stage is 2.1~3.8℃ / h, and the time of the second heating stage is 2 preset furnace transfer cycles; the heating rate of the third heating stage is 3.5~6.5℃ / h, and the time of the third heating stage is 2 preset furnace transfer cycles; the heating rate of the fourth heating stage is 1.5~1.8℃ / h, and the time of the fourth heating stage is X preset furnace transfer cycles, where X=0.3~0.4.

[0033] Furthermore, the heating rate of the first preset furnace transfer cycle in the third heating stage is 3.5~5.3℃ / h, and the heating rate of the second preset furnace transfer cycle in the third heating stage is 5.6~6.5℃ / h. The fourth heating stage and the holding stage together have two preset furnace transfer cycles.

[0034] Specifically, upon reaching a preset furnace relocation cycle, the mobile heating device and the mobile cooling device move forward one calcining furnace chamber. The calcining furnace chambers 1P~7P covered by the heating zone of the mobile heating device and the calcining furnace chambers 1C~7C covered by the cooling zone of the mobile cooling device also move forward one calcining furnace chamber. For example, before the furnace relocation, calcining furnace chambers 1P~7P respectively cover calcining furnace chambers 1#~7#, and calcining furnace chambers 1C~7C respectively cover calcining furnace chambers 8#~14#. Upon reaching a preset furnace relocation cycle, calcining furnace chamber 1P moves forward one calcining furnace chamber to calcining furnace chamber 54#, calcining furnace chamber 2P moves forward to calcining furnace chamber 1#, calcining furnace chamber 3P moves forward to calcining furnace chamber 2#, calcining furnace chamber 4P moves forward to calcining furnace chamber 3#, and calcining furnace chamber 5P moves forward to calcining furnace chamber 4#. The calcining process then continues. Calcining chamber 6P moves forward to calcining chamber 5#, calcining chamber 7P moves forward to calcining chamber 6#, calcining chamber 1C moves forward one calcining chamber to calcining chamber 7#, calcining chamber 2C moves forward to calcining chamber 8#, calcining chamber 3C moves forward to calcining chamber 9#, calcining chamber 4C moves forward to calcining chamber 10#, calcining chamber 5C moves forward to calcining chamber 11#, calcining chamber 6C moves forward to calcining chamber 12#, and calcining chamber 7C moves forward to calcining chamber 13#.

[0035] It should be understood that the first heating stage is carried out in the calcining furnace chamber 1P, the second heating stage is carried out in the calcining furnace chambers 2P and 3P, the first preset furnace transfer cycle in the third heating stage is carried out in the calcining furnace chamber 4P, the second preset furnace transfer cycle in the third heating stage is carried out in the calcining furnace chamber 5P, the first 1-X preset furnace transfer cycles of the fourth heating stage and the heat preservation stage are carried out in the calcining furnace chamber 6P, and the last preset furnace transfer cycle of the heat preservation stage is carried out in the calcining furnace chamber 7P. The heating rate of calcining furnace chamber 1P is 6.5~9.7℃ / h, the heating rate of calcining furnace chambers 2P and 3P is 2.1~3.8℃ / h, the heating rate of calcining furnace chamber 4P is 3.5~5.3℃, the heating rate of calcining furnace chamber 5P is 5.6~6.5℃ / h, the heating rate of calcining furnace chamber 6P is 2.1~3.8℃ / h in the first X preset furnace transfer cycles, and calcining furnace chamber 6P is kept at temperature in the last 1-X preset furnace transfer cycles. Calcination furnace chamber 7P is also kept at temperature. Taking the anode green billet in calcining furnace chamber 1# as an example, after 7 preset furnace transfer cycles, calcining furnace chambers 1P~7P sequentially pass through calcining furnace chamber 1#, and the anode green billet in calcining furnace chamber 1# undergoes a complete preset temperature curve.

[0036] Furthermore, the temperature of roasting chamber 1P is increased from 230~300℃ to 520~560℃, roasting chamber 2P is increased from 520~560℃ to 630~650℃, roasting chamber 3P is increased from 630~650℃ to 720~760℃, roasting chamber 4P is increased from 720~760℃ to 880~900℃, roasting chamber 5P is increased from 880~900℃ to 1090~1100℃, roasting chamber 6P is increased from 1090~1100℃ to 1150~1200℃ and then held at 1150~1200℃, and roasting chamber 7P is held at 1150~1200℃. Under the influence of the high temperature in the calcination chamber 7P, the calcination chamber 1C is also kept at 1150~1200℃, while the calcination chambers 2C~7C cool down the burned anode green blanks according to the preset cooling curve.

[0037] In some embodiments, the power of the combustion chamber is adjusted in real time by a PLC system to ensure the accurate execution of the preset temperature curve, thereby increasing the stability of the calcination system.

[0038] Furthermore, the roasting system of this application adopts a 7-chamber operation mode, meaning the heating zone of the mobile heating equipment covers 7 roasting chambers. Compared with the prior art, this increases the number of combustion racks and extends the length of the heating zone, resulting in a more uniform temperature field in the heating zone. This reduces the temperature uniformity error of the heating zone from ±15℃ in traditional roasting systems to ≤±8℃, providing a stable heating environment for the anode green billet. This reduces the difference in thermal expansion coefficients by 30% and the cracking rate to below 3%, significantly reducing the cracking tendency of prebaked anodes. Moreover, with the action of 4 combustion racks, the heating power per unit furnace chamber is increased from the traditional 120kW / chamber to 140kW / chamber, while maintaining the overall power balance of the heating zone. This reduces production capacity loss by 8%~10% while increasing the product qualification rate by 10%, achieving an optimal balance between production capacity loss and quality improvement.

[0039] This application increases the number of combustion racks in the calcination system to four or more, thereby increasing the holding time of the anode green in the calcination system and reducing the heating rate. This results in more complete decomposition of the asphalt in the prebaked anode, reducing the residual volatiles (tar, hydrocarbon gases) in the prebaked anode. Furthermore, the increased number of combustion racks allows for a longer heating time in the calcination system, which can reduce the heating rate at each stage and optimize the temperature field distribution in the heating zone of the mobile heating equipment, thus producing prebaked anodes that meet the requirements of high current density anodes.

[0040] Example 1 Please see Figure 2 , Figure 2A schematic diagram of a preset temperature curve according to an embodiment of this application is shown. This embodiment provides a calcination system for prebaked anodes, including: calcination chambers 1# to 54# that are interconnected; a mobile heating device, the heating zone of which covers calcination chambers 1P, 2P, 3P, 4P, 5P, 6P, and 7P. The mobile heating device includes: a temperature and pressure measuring frame (TPR), a flue gas rack (ER), and combustion racks (HR1, HR2, HR3, and HR4). The temperature and pressure measuring frame (TPR) is located in calcination chamber 2P, the flue gas rack (ER) is located in calcination chamber 1P, and the combustion racks (HR1, HR2, HR3, and HR4) are located in combustion chamber 1P. The calcining rack HR3 and the combustion rack HR4 are respectively located in calcining chambers 4P, 5P, 6P and 7P; the mobile cooling equipment covers the following calcining chambers: 1C, 2C, 3C, 4C, 5C, 6C and 7C, wherein 1C and 7P are adjacent to each other. The mobile cooling equipment includes: a zero-pressure rack ZPR, a blower rack BR ​​and a cooling rack CR. The zero-pressure rack ZPR is located in 1C, the blower rack BR ​​is located in 4C, and the cooling rack CR is located between 6C and 7C.

[0041] In this embodiment, the preset temperature curve is set over seven preset furnace transfer cycles, with one preset furnace transfer cycle being 34 hours. From 0 to 34 hours, the heating rate is 9.1℃ / h, increasing the temperature from 230℃ to 540℃. From 34 to 68 hours, the heating rate is 3.1℃ / h, increasing the temperature from 540℃ to 645℃. From 68 to 102 hours, the heating rate is 3.1℃ / h, increasing the temperature from 645℃ to 750℃. From 102 to 136 hours, the heating rate is 4.4℃ / h, increasing the temperature from 750℃ to 900℃. From 136 to 170 hours, the heating rate is 5.9℃ / h, increasing the temperature from 900℃ to 1100℃. From 170 to 183 hours, the heating rate is 3.8℃ / h, increasing the temperature from 1100℃ to 1150℃. During the 183~238h period, the temperature is maintained at 1150℃. In this embodiment, the holding time of the preset temperature curve is 55h. Since the calcination chamber 1C is also in a holding state, the total holding time of the anode green billet in the calcination system is 89h, which is the holding time of the preset temperature curve of 55h and the 34h in the calcination chamber 1C.

[0042] According to the preset temperature curve in this embodiment, the temperature of calcining chamber 1P is increased from 230℃ to 540℃, the temperature of calcining chamber 2P is increased from 540℃ to 645℃, the temperature of calcining chamber 3P is increased from 645℃ to 750℃, the temperature of calcining chamber 4P is increased from 750℃ to 900℃, the temperature of calcining chamber 5P is increased from 900℃ to 1100℃, the temperature of calcining chamber 6P is increased from 1100℃ to 1150℃ and then held at 1150℃, the temperature of calcining chamber 7P is held at 1150℃, and the temperature of calcining chamber 1C is also held at 1150℃.

[0043] The prebaked anodes obtained by the calcination system provided in this embodiment were tested for apparent density according to ASTM D5502 / ISO 12985 and for room temperature resistivity according to ASTM D6120. The test results are shown in Table 2.

[0044] Table 2

[0045] The apparent density of all 10 prebaked anodes in Table 2 is greater than or equal to 1.59 g / cm³. 3 The resistivity is less than or equal to 54 μΩ·m, which meets the requirements for high current density anodes. Furthermore, the difference in the coefficient of thermal expansion of the prebaked anodes obtained through this embodiment can be reduced by 30%, and the cracking rate can be reduced to below 3%, which can significantly reduce the cracking tendency of the prebaked anodes.

[0046] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. 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 apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0047] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A baking system for prebaked anodes, characterized in that The system comprises: M interconnected baking furnace chambers for accommodating anode green bodies, M≥14; a moving heating device comprising N combustion racks, N of the combustion racks are arranged corresponding to N adjacent baking furnace chambers in the M baking furnace chambers, the combustion racks are used for burning anode green bodies located in the baking furnace chambers, N≥4; wherein the N combustion racks move along a preset moving direction at a preset moving cycle, heating flue gas generated by the combustion racks flows between the baking furnace chambers along the preset moving direction, and the combustion racks and the heating flue gas form a heating zone of the moving heating device.

2. The baking system according to claim 1, wherein: the N combustion racks comprise a first combustion rack and N-1 following combustion racks, the following combustion racks move along the preset moving direction following the first combustion rack; the moving heating device further comprises: a temperature and pressure measuring rack arranged on a side of the first combustion rack away from the N-1 following combustion racks; an exhaust rack arranged on a side of the temperature and pressure measuring rack away from the first combustion rack, used for guiding the heating flue gas generated by the combustion racks to flow between the baking furnace chambers along the preset moving direction.

3. The calcining system of claim 1, wherein, The heating zone of the moving heating device controls the temperature of the baking furnace chambers covered by the heating zone according to a preset temperature curve; the preset temperature curve comprises: a first temperature rising section, a second temperature rising section, a third temperature rising section, a fourth temperature rising section and a holding section; wherein the first temperature rising section has a first temperature rising rate, the third temperature rising section has a third temperature rising rate, the second temperature rising section has a second temperature rising rate, and the fourth temperature rising section has a fourth temperature rising rate, the first temperature rising rate > the third temperature rising rate > the second temperature rising rate > the fourth temperature rising rate; the first temperature rising rate < 10℃ / h; the fourth temperature rising section has a starting temperature ≥1050℃; the holding section has a time ≥54h.

4. The calcining system of claim 3, wherein, the time of the holding section is 2-X preset moving cycles, the temperature of the holding section is 1150-1200℃, and X=0.3-0.

4.

5. The calcining system of claim 4, wherein, the length of the heating zone is 7 baking furnace chambers, and the preset temperature curve has a time of 7 preset moving cycles; the first temperature rising rate of the first temperature rising section is 6.5-9.7℃ / h, and the first temperature rising section has a time of 1 preset moving cycle; the second temperature rising rate of the second temperature rising section is 2.1-3.8℃ / h, and the second temperature rising section has a time of 2 preset moving cycles; the third temperature rising rate of the third temperature rising section is 3.5-6.5℃ / h, and the third temperature rising section has a time of 2 preset moving cycles; the fourth temperature rising rate of the fourth temperature rising section is 1.5-1.8℃ / h, and the fourth temperature rising section has a time of X preset moving cycles.

6. The baking system according to claim 3, wherein the first temperature rising section has a starting temperature of 230-300℃.

7. The calcining system of claim 1, wherein, The system further comprises: a moving cooling device arranged behind the moving heating device along the preset moving direction, used for cooling the anode green bodies after combustion.

8. The calcining system of any one of claims 1 to 7, wherein, N of the combustion racks move along the preset moving direction at a preset moving cycle, comprising: every time a preset moving cycle is reached, N of the combustion racks move along the preset moving direction by one baking furnace chamber.

9. The calcining system of any one of claims 1 to 7, wherein, The preset tapping cycle is 34 h.

10. The calcining system of any one of claims 1 to 7, wherein, M is 54-70.

Images