Trolley furnace

Abstract

The utility model belongs to the technical field of heat treatment equipment, and provides a trolley furnace which is characterized in that a calandria type air inlet is formed in an air inlet area on the side wall of a furnace body of the trolley furnace, and a strip type air outlet extending transversely is formed in an air outlet area; and linear heating rods are further arranged on the side wall of the furnace body and are arranged on the two sides of the air inlet area and the two sides of the air outlet area in the vertical direction. According to the utility model, by adjusting and optimizing the air inlet / outlet and heating structure and arrangement in the trolley furnace, the temperature field and the airflow field in the furnace can be further effectively improved, so that the material sintering is more uniform, and the physical and chemical property consistency and uniformity of the heat treatment material are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of heat treatment equipment relates to a bogie hearth furnace. BACKGROUND

[0002] The performance of lithium ion batteries is mainly determined by the positive electrode material, which is a key factor in determining the energy density, voltage, service life and safety of the battery, and is also the part with the highest cost in lithium batteries, accounting for about 30-40% of the cost of the entire power battery cell. The performance and cost of commercial positive electrode materials are deeply affected by large-scale industrial production.

[0003] The preparation process of the positive electrode material usually needs to include high-temperature heat treatment, and the kiln is the key equipment to realize this process link. The kiln commonly used for the preparation of positive electrode materials includes roller kiln and bogie hearth furnace, etc. The roller kiln is a continuous heat treatment equipment, and its core component is a roller made of refractory material. The roller is driven to rotate by a motor, so that the material (such as positive electrode material precursor) placed on the roller continuously moves in the kiln, and at the same time, heating elements (such as resistance wires, gas burners, etc.) are arranged inside the furnace body to uniformly heat the material. However, the heating method of the roller kiln is usually single, and it is difficult to realize accurate control of complex temperature curves, which may limit its application range for some positive electrode materials that require specific heat treatment processes. Finally, the maintenance cost of the roller kiln is relatively high, and problems such as wear and deformation of the roller and aging of the heating elements need to be checked and replaced regularly.

[0004] The bogie hearth furnace is a periodic operation furnace, and the hearth is not divided into regions. The hearth is provided with corresponding air inlet and outlet ports and heating elements corresponding to the air inlet and outlet ports, and the furnace bottom is a movable bogie. Before heating, the bogie is loaded outside the furnace, the heating element is placed on a special pad iron or saggar, and then the bogie is pulled into the furnace by a traction mechanism for heating. After heating, the bogie is pulled out of the furnace by the traction mechanism for unloading. For example, CN207797718U discloses a sectional type bogie hearth furnace, which provides a quick and simple variable capacity operation technology through the cooperation of the number of bogies of the sectional type bogie hearth furnace and the front and rear furnace doors, so that the transmission device is convenient for offline maintenance during equipment maintenance, and the safety of online maintenance and maintenance is guaranteed, and the structure is compact and the operation is simple. CN209147715U discloses a multifunctional bogie hearth furnace, which adopts an insertion type contact at the contact position of the furnace bottom plate and the furnace body, increases the integrity, and avoids the damage of the heating element caused by the oxide substances generated during the heating process falling into the surrounding of the heating element through the gap between the furnace bottom plates.

[0005] Compared with the roller kiln, the car bottom furnace not only has a longer length, but also has a larger single capacity, and the number of the sagger carried by the car is larger, and the sagger is stacked more concentratedly, the space utilization is high, the processing capacity is larger, and the capacity is more advantageous; at the same time, the heating part of the car bottom furnace and the air inlet and outlet are in the same space, which is beneficial to the consistency and uniformity of the temperature field, and can also make the airflow flow more smoothly, and the heat utilization rate is higher.

[0006] In summary, for the large-scale production of high-quality and high-performance positive electrode materials, the development of efficient and low-cost car bottom furnace which is beneficial to the flow of gas flow, mass transfer, heat conduction and avoids pollution plays an important role in further promoting the sustainable growth and development of the energy industry. Practical new type content

[0007] In view of the problems in the prior art, the purpose of the utility model is to provide a car bottom furnace, the air inlet area on the side wall of the furnace body of the car bottom furnace is provided with a row pipe type air inlet, and the air outlet area is provided with a horizontally extending long strip type air outlet; and a one-dimensional heating rod is further arranged on the side wall of the furnace body, the one-dimensional heating rod is arranged on both sides of the air inlet area and the air outlet area in the vertical direction. The utility model adjusts and optimizes the structure and arrangement of the air inlet and outlet and heating in the car bottom furnace, which can further effectively improve the temperature field and airflow field in the kiln, make the material sintering more uniform, and improve the consistency and uniformity of the physical and chemical properties of the heat treated material.

[0008] In order to achieve this purpose, the utility model adopts the following technical scheme:

[0009] In a first aspect, the utility model provides a car bottom furnace, the car bottom furnace includes a furnace body, and a car running in the furnace body; along the running direction of the car, the side wall of the furnace body on any side is provided with an array type air inlet area, and the side wall on the other side is provided with an air outlet area corresponding to the air inlet area; the air inlet area is provided with a row pipe type air inlet, the air outlet area is provided with a long strip type air outlet, and the long strip type air outlet extends horizontally along the running direction of the car; a one-dimensional heating rod is further arranged on the side wall of the furnace body, the one-dimensional heating rod is arranged on both sides of the air inlet area and the air outlet area in the vertical direction (the direction perpendicular to the horizontal plane), and extends horizontally along the running direction of the car.

[0010] The trolley furnace has the advantages that the temperature field and the airflow field in the kiln are effectively improved, the sintering of materials is more uniform, the physical and chemical performance consistency and uniformity of the heat-treated materials are improved, the airflow in the furnace is more stable, the diffusion is more uniform, the gas exchange efficiency is higher, dust is effectively avoided, material pollution and loss are avoided, the vertical U-shaped heating rod is changed into a horizontal linear heating rod, the heating efficiency of each layer of materials to be sintered is effectively adjusted, the heat accumulation effect is reduced, uniform sintering of all materials is realized, the vertical exhaust port is changed into a horizontal long strip-shaped exhaust port, the exhaust intensity is effectively improved, and the influence of waste gas on materials is reduced.

[0011] The following is a preferred technical scheme of the utility model, but not as a restriction of the technical scheme provided by the utility model, through the following technical scheme, the technical purpose and beneficial effect of the utility model can be better achieved and realized.

[0012] As a preferred technical scheme of the utility model, the trolley is provided with arrayed sagger stacks, and each sagger stack comprises at least two saggars stacked in a vertical direction.

[0013] As a preferred technical scheme of the utility model, each sagger stack comprises 8-12 saggars stacked in a vertical direction.

[0014] As a preferred technical scheme of the utility model, in a direction perpendicular to the advancing direction of the trolley, the arrayed sagger stacks are divided into at least two columns; and in a direction parallel to the advancing direction of the trolley, the arrayed sagger stacks are divided into at least two rows.

[0015] In the utility model, the sagger stacks are preferably divided into two columns, i.e., one column is close to the side wall of the furnace body where the air inlet area is located, and the other column is close to the side wall of the furnace body where the air outlet area is located, and there is no other column in the middle, and the airflow flows through, and the airflow field is more uniform.

[0016] As a preferred technical scheme of the utility model, in the orthographic projection of the side wall of the furnace body, the number and position of the saggars correspond to the number and position of the air inlet area and the air outlet area.

[0017] As a preferred technical scheme of the utility model, the number of the rows of the row pipe type air inlet is 5-10, and the diameter of each row is 1-2 mm.

[0018] In the utility model, preferably, the single-pipe air inlet (generally with a diameter of 8-12 mm) is adjusted to a small-diameter row pipe, so that the effect of smooth airflow, uniform diffusion and dust raising prevention is further ensured.

[0019] As the preferred technical scheme of the utility model, the long-strip-shaped exhaust ports of the adjacent exhaust zones are combined along the direction of travel parallel to the trolley.

[0020] It should be noted that the long-strip-shaped exhaust ports of the adjacent exhaust zones are combined, which means that the long-strip-shaped exhaust ports extend transversely along the direction of travel parallel to the trolley, and after extending to a certain length, the first section and / or the tail end of the long-strip-shaped exhaust ports will contact or overlap with the long-strip-shaped exhaust ports of the adjacent exhaust zones. At this time, the multiple long-strip-shaped exhaust ports can be combined end to end into a whole long-strip-shaped exhaust port.

[0021] As the preferred technical scheme of the utility model, the long-strip-shaped exhaust ports of the adjacent exhaust zones are combined along the direction of travel parallel to the trolley.

[0022] It should be noted that the long-strip-shaped exhaust ports of the adjacent exhaust zones are combined, which means that the long-strip-shaped exhaust ports extend transversely along the direction of travel parallel to the trolley, and after extending to a certain length, the first section and / or the tail end of the long-strip-shaped exhaust ports will contact or overlap with the long-strip-shaped exhaust ports of the adjacent exhaust zones. At this time, the multiple long-strip-shaped exhaust ports can be combined end to end into a whole long-strip-shaped exhaust port.

[0023] As the preferred technical scheme of the utility model, the top of the furnace body is arc-shaped.

[0024] As the preferred technical scheme of the utility model, the top of the furnace body is semicircular.

[0025] In the utility model, the top of the furnace body is adjusted from the conventional horizontal structure in the prior art to an arc shape, preferably a semicircular structure, which is more conducive to heat convection, improves the uniformity of the internal temperature field of the kiln, and realizes uniform sintering of the material.

[0026] As the preferred technical scheme of the utility model, each of the long-strip-shaped heating rods is independently adjusted and controlled in temperature.

[0027] Compared with the prior art, the utility model has at least the following beneficial effects:

[0028] The utility model discloses a single pipe air inlet of prior art conventional is changed into row pipe type air inlet, can make the airflow in the furnace more stable, diffuses more evenly, and the gas exchange efficiency is higher, and simultaneously, can effectively avoid the dust raising, causes material pollution and loss, the utility model discloses a vertical U shape heating rod of prior art conventional becomes horizontal one character shape heating rod, can control the single body to heating rod, can effectively adjust the heating efficiency of every layer to be sintered material, reduces the heat accumulation effect, realizes the uniform sintering to all materials, the utility model discloses the row of exhaust port adjusts the vertical exhaust port of prior art conventional to the horizontal long strip exhaust port, can effectively strengthen the exhaust intensity, reduces the influence of waste gas to material, the trolley furnace of the utility model is especially applicable to the large-scale production and manufacture of high-energy density and high specific capacity and other high-performance positive electrode materials. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the front view schematic drawing of the trolley furnace of example 1 towards the furnace.

[0030] Figure 2 It is the front view schematic drawing of the furnace body side wall of example 1 in the setting of air inlet area.

[0031] Figure 3 It is the front view schematic drawing of the furnace body side wall of example 1 in the setting of exhaust area.

[0032] Figure 4 It is the schematic diagram of the air inlet area and the sagger stack cooperation of example 1, the dotted arrow in the drawing indicates the air inlet direction, and the solid arrow indicates the advancing direction of trolley.

[0033] Figures 1 to 4 In it, 10-furnace body, 20-sagger stack, 21-sagger, 30-row pipe type air inlet, 40-long strip exhaust port, 50-one character shape heating rod.

[0034] Figure 5 It is the front view schematic drawing of the trolley furnace of comparative example 1 towards the furnace.

[0035] Figure 6 It is the front view schematic drawing of the furnace body side wall of comparative example 1 in the setting of air inlet area.

[0036] Figure 7 It is the front view schematic drawing of the furnace body side wall of comparative example 1 in the setting of exhaust area.

[0037] Figure 8 It is the schematic diagram of the air inlet area and the sagger stack cooperation of comparative example 1, the dotted arrow in the drawing indicates the air inlet direction, and the solid arrow indicates the advancing direction of trolley.

[0038] Figures 5 to 810 - furnace body, 20 - stack of sagger, 21 - sagger, 31 - single-tube gas inlet, 41 - longitudinal gas outlet, 51 - U-shaped heating rod. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be further illustrated by the specific embodiments.

[0040] Those skilled in the art should understand that the embodiments are only to help understand the present application, and should not be regarded as specific limitations of the present application.

[0041] In some specific embodiments, the present application provides a car bottom furnace, which comprises a furnace body and a car travelling inside the furnace body; along the travelling direction of the car, the side wall of the furnace body on either side is provided with an array of gas inlet zones, and the side wall on the other side is provided with an array of gas outlet zones corresponding to the gas inlet zones; the gas inlet zones are provided with a row of tube gas inlets, and the gas outlet zones are provided with a long strip gas outlet extending transversely to the travelling direction of the car; the side wall of the furnace body is further provided with a U-shaped heating rod, which is arranged on both sides of the gas inlet zones and the gas outlet zones in the vertical direction and extends transversely to the travelling direction of the car.

[0042] In one embodiment, the car is provided with an array of sagger stacks, and each sagger stack comprises at least two saggars stacked in the vertical direction.

[0043] In one embodiment, each sagger stack comprises 8-12 saggars stacked in the vertical direction, for example, 8, 9, 10, 11 or 12 saggars.

[0044] In one embodiment, the array of sagger stacks is divided into at least two columns in the direction perpendicular to the travelling direction of the car, and is divided into at least two rows in the direction parallel to the travelling direction of the car.

[0045] In one embodiment, in the orthographic projection to the side wall of the furnace body, the number and position of the saggars correspond to the number and position of the gas inlet zones and the gas outlet zones.

[0046] In one embodiment, the row of tube gas inlets comprises 5-10 tubes, for example, 5, 6, 7, 8, 9 or 10 tubes, each with a diameter of 1-2 mm, for example, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm, etc.

[0047] In one embodiment, the elongated exhaust ports of adjacent exhaust zones are merged along the direction of travel parallel to the trolley.

[0048] In one embodiment, the linear heating rods between adjacent intake zones and adjacent exhaust zones are combined for sharing along the vertical direction.

[0049] In one embodiment, the top of the furnace body is arc-shaped.

[0050] In one embodiment, the top of the furnace body is semi-circular.

[0051] In one embodiment, each of the linear heating rods is independently adjustable for temperature control.

[0052] Example 1

[0053] This embodiment provides a bogie furnace, such as Figures 1 to 4 As shown, the trolley furnace includes a furnace body 10 and a trolley that travels inside the furnace body 10; on the side walls of the furnace body on both sides of the trolley's travel direction, there are arrayed air intake zones and exhaust zones corresponding to the air intake zones; the top of the furnace body 10 is arc-shaped.

[0054] The air intake area is provided with a pipe-type air intake 30, which has 8 pipes, each with a diameter of 1.4 mm.

[0055] The exhaust zone is provided with a long exhaust port 40, which extends laterally along the direction of travel of the trolley, and the long exhaust ports 40 of adjacent exhaust zones are merged.

[0056] A straight heating rod 50 is also provided on the side wall of the furnace body. The straight heating rod 50 is located on both sides of the air inlet area and the air outlet area in the vertical direction and extends laterally parallel to the travel direction of the trolley. Each straight heating rod 50 is independently adjustable and temperature controlled. The straight heating rods 50 between adjacent air inlet areas and between adjacent air outlet areas are combined to share a common heating rod.

[0057] The trolley is equipped with arrayed sagger stacks 20. Along the direction perpendicular to the trolley's travel, the arrayed sagger stacks 20 are divided into two rows; along the direction parallel to the trolley's travel, the arrayed sagger stacks 20 are divided into four rows. Each sagger stack 20 includes 10 saggers 21 stacked vertically. In a projection onto the side wall of the furnace body, the number and position of the saggers 21 correspond to the number and position of the air inlet and exhaust zones.

[0058] Comparative Example 1

[0059] The present comparative example provides a trolley furnace, as shown in the drawings, which comprises a furnace body 10 and a trolley travelling inside the furnace body 10; on the furnace body side walls on both sides of the travelling direction of the trolley, an array of air inlet zones and exhaust zones corresponding to the air inlet zones are respectively arranged; the top of the furnace body 10 is a horizontal plane; Figures 5 to 8

[0060] The air inlet zone is provided with a single-pipe air inlet 31 with a caliber of 10 mm;

[0061] The exhaust zone is provided with a longitudinal exhaust port 41 which extends in the vertical direction, and the longitudinal exhaust ports 41 of adjacent exhaust zones are combined;

[0062] The furnace body side wall is also provided with a U-shaped heating rod 51, the long side of the U-shaped heating rod 51 is arranged and extends in the vertical direction, and the short side is arranged at the bottom of the lowermost air inlet zone and exhaust zone, so that the U-shaped heating rod 50 surrounds each air inlet zone and exhaust zone arranged in the vertical direction;

[0063] The trolley is provided with an array of sagger stacks 20, which are divided into two columns in the vertical direction perpendicular to the travelling direction of the trolley; in the direction parallel to the travelling direction of the trolley, the array of sagger stacks 20 is divided into four rows. Each sagger stack 20 comprises 10 saggars 21 stacked in the vertical direction. In the orthographic projection to the furnace body side wall, the number and position of the saggars 21 correspond to the number and position of the air inlet zones and the exhaust zones.

[0064] By comparing the actual application of the trolley furnace of Example 1 and Comparative Example 1, it can be seen that after adjusting the air inlet of the trolley furnace of Example 1 from a large-caliber single pipe to a small-caliber row pipe, the airflow in the kiln is more stable, the diffusion is more uniform, and the gas exchange efficiency is higher. At the same time, it can also effectively prevent dust from being raised, causing material pollution and loss; adjusting the vertical U-shaped heating rod to a horizontal one-shaped heating rod can control the heating rod as a single unit, effectively adjust the heating efficiency of each layer of sagger, reduce the heat accumulation effect, and realize uniform sintering of all materials; adjusting the exhaust port from a vertical setting to a horizontal setting and extending horizontally can effectively strengthen the exhaust intensity and reduce the influence of waste gas on the material; after adjusting the top of the kiln from a horizontal structure to an arc structure, it is more conducive to heat convection, which can improve the uniformity of the kiln temperature field and realize uniform sintering of the material.

[0065] The above describes the preferred embodiments of the present application, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, which all belong to the protection scope of the present application. ​

[0066] It should be further noted that the various technical features described in the above detailed description can be combined in any suitable manner, and that the application is not limited to the specific combinations described above, unless otherwise indicated.

[0067] Furthermore, the various different embodiments of the application can also be combined with each other, as long as this does not contradict the idea of the application, and this should likewise be regarded as being disclosed by the application.

Claims

1. A pusher furnace, characterized in that The furnace body (10) and the trolley travelling inside the furnace body (10) are included; along the travelling direction of the trolley, the side wall of the furnace body on either side is provided with an array of air inlet zones, and the side wall on the other side is provided with an array of air outlet zones corresponding to the air inlet zones; the air inlet zones are provided with pipe-type air inlets (30), and the air outlet zones are provided with long-strip air outlets (40) extending transversely along the travelling direction of the trolley; the furnace body side wall is further provided with a horizontal heating rod (50) extending transversely along the travelling direction of the trolley, which is arranged on both sides of the air inlet zones and the air outlet zones in the longitudinal direction.

2. The pusher furnace of claim 1, wherein The trolley is provided with an array of saggar stacks (20), each of which includes at least two saggars (21) stacked in the vertical direction.

3. The pusher furnace of claim 2, wherein Each of the saggar stacks (20) includes 8-12 saggars (21) stacked in the vertical direction.

4. A car bottom furnace according to claim 2 or 3, characterised in that The array of saggar stacks (20) is divided into at least two columns in the direction perpendicular to the travelling direction of the trolley; and is divided into at least two rows in the direction parallel to the travelling direction of the trolley.

5. The pusher furnace of claim 4, wherein In the orthographic projection to the furnace body side wall, the number and position of the saggars (21) correspond to the number and position of the air inlet zones and the air outlet zones.

6. A car bottom furnace according to any one of claims 1-3, characterized in that The number of pipes of the pipe-type air inlets (30) is 5-10, and the diameter of each pipe is 1-2 mm.

7. A car bottom furnace as claimed in any one of claims 1 to 3, wherein In the direction parallel to the travelling direction of the trolley, the long-strip air outlets (40) of adjacent air outlet zones are combined.

8. A car bottom furnace according to any one of claims 1-3, characterized in that In the vertical direction, the horizontal heating rods (50) between adjacent air inlet zones and adjacent air outlet zones are combined to share.

9. A car bottom furnace as claimed in any one of claims 1 to 3, wherein The top of the furnace body (10) is arc-shaped.

10. A pusher furnace according to any one of claims 1-3, characterized in that Each of the horizontal heating rods (50) is independently adjusted for temperature control.

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