WO2022156161A1

WO2022156161A1 - Multi-channel wheel-rail tunnel kiln

Info

Publication number: WO2022156161A1
Application number: PCT/CN2021/106423
Authority: WO
Inventors: 王霞; 吴桢
Original assignee: 信诺先端热工科技(苏州)有限公司
Priority date: 2021-01-20
Filing date: 2021-07-15
Publication date: 2022-07-28
Also published as: EP4212810A4; EP4212810A1; KR20230059174A

Abstract

A multi-channel wheel-rail tunnel kiln, which belongs to the field of tunnel kilns. The tunnel kiln comprises a kiln body, two atmosphere regulating chambers, a kiln outer housing, and an atmosphere control device; the kiln outer housing encloses the kiln body; and the two atmosphere regulating chambers are respectively connected at both ends of the kiln body; and the atmosphere control device is provided on the kiln body. The tunnel kiln can achieve relatively high yields and can also provide better atmosphere control.

Description

A multi-channel wheel-rail tunnel kiln

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims the priority of the Chinese patent application No. 2021100736814, entitled "A Multi-Channel Wheel-Rail Tunnel Kiln", filed with the China Patent Office on Jan. 20, 2021, and filed in China on Jan. 20, 2021 The priority of the Chinese Patent Application No. 2021201582734, entitled "A Multi-Channel Wheel-Rail Tunnel Kiln" with the Patent Office, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of tunnel kilns, and in particular, to a multi-channel wheel-rail tunnel kiln.

Background technique

In the process of preparing cathode materials for batteries such as lithium-ion batteries, the high-temperature calcination process determines the physical and chemical properties of the cathode materials to a considerable extent, which greatly affects the performance of the final assembled lithium-ion battery. At present, continuous kilns are mostly used in the production of cathode materials, which are mainly tunnel kilns. Tunnel kilns are usually made of refractory materials, thermal insulation materials and building materials. , which can be realized in various forms, such as push-plate tunnel kiln (referred to as push-plate kiln), roller tunnel kiln (roller kiln for short), wheel-rail tunnel kiln (also known as kiln car tunnel kiln), etc. The cathode material is calcined at high temperature in a continuous kiln.

However, pusher kilns and roller kilns have the problem of relatively low output. As a continuous kiln, the wheel-rail tunnel kiln has higher output than the above two, but it has problems such as poor air tightness, so it is difficult to be applied to the calcining atmosphere with high requirements. Production of cathode materials.

SUMMARY OF THE INVENTION

In order to improve at least one of the problems of tunnel kiln output and air tightness, the purpose of this application is to propose a multi-channel wheel-rail tunnel kiln.

This application is implemented like this:

The present application provides a multi-channel wheel-rail tunnel kiln, which includes: a kiln body, which has a furnace wall, a partition wall and a track, the furnace wall defines a furnace chamber and is partitioned by the partition wall into at least two kiln cavities corresponding to the tracks one-to-one , the track is located inside the kiln cavity; the first atmosphere adjustment chamber with a first inner channel is connected to the furnace wall at the kiln head through a first airtight gate, and the first inner channel is connected to at least two kilns through the first airtight gate The cavities are optionally communicated or isolated; a second atmosphere conditioning chamber with a second inner channel is connected to the furnace wall at the kiln end through a second airtight gate, and the second inner channel is connected to at least two The kiln cavity is optionally communicated or isolated; the kiln shell body air-tightly wraps the kiln body; the atmosphere control device has a gas injection mechanism and a gas extraction mechanism for linkage control of at least two atmospheres in the kiln cavity, and the gas injection mechanism and the air extraction mechanism are independently arranged on the furnace wall and/or the partition wall.

Optionally, the tunnel kiln includes: a first conditioning chamber shell that airtightly wraps the first atmosphere conditioning chamber, and a second conditioning chamber outer shell that encloses the second atmosphere conditioning chamber. Optionally, both ends of the kiln shell are airtightly connected to the first and second conditioning chamber shells, respectively.

Optionally, there is a first moving mechanism capable of butt-fitting and movable with the rail in the first inner channel; and/or a second moving mechanism capable of being butt-fitted and movable with the rail in the second inner channel.

Optionally, the first internal channel is a plurality of first sub-channels that are consistent with the number of at least two kiln cavities and are independent of each other, and the first moving mechanism includes a plurality of first sub-moving mechanisms respectively located in the plurality of first sub-channels. . And/or, the second internal channel is a plurality of second sub-channels that are consistent with the number of at least two kiln cavities and are independent of each other, and the second moving mechanism includes a plurality of second sub-moving mechanisms respectively located in the plurality of second sub-channels. .

Optionally, two adjacent kiln cavities share a partition wall.

Optionally, the gas injection port of the gas injection mechanism is arranged on the partition wall, and the gas extraction port of the gas extraction mechanism is arranged on the furnace wall.

Optionally, the gas injection port of the gas injection mechanism is set on the furnace wall, and the gas suction port of the gas extraction mechanism is set on the partition wall; Installed on furnace walls and partition walls.

Optionally, when the air extraction port of the air extraction mechanism is located on the partition wall, the air extraction port leads out the air outlet from the bottom of the kiln body.

Optionally, the gas injection mechanism includes a plurality of gas injection groups arranged along the kiln head to the kiln tail of the kiln body, and each gas injection group includes a plurality of gas injection ports, and the plurality of gas injection ports are distributed on the section of the kiln body and along the kiln body. The kiln body is arranged from the kiln bottom to the kiln top; the air extraction mechanism includes a plurality of air extraction groups arranged along the kiln head to the kiln end of the kiln body, and each air extraction group includes a plurality of air extraction ports, and the plurality of air extraction ports are distributed It is arranged in the section of the kiln body and along the kiln bottom to the kiln top of the kiln body.

Optionally, on the section of the kiln body, the gas injection group and the gas extraction group are arranged opposite to each other; and/or, along the direction from the kiln head to the kiln tail of the kiln body, on the partition wall or furnace wall on the same side, gas injection The air injection groups in the mechanism and the air extraction groups in the air extraction mechanism are arranged alternately.

Optionally, at the kiln bottom of the kiln body, the furnace wall is provided with a curved seal groove, and the curved seal groove is configured to be embedded for a carrier traveling in the multi-channel wheel-rail tunnel kiln.

Optionally, the carrier has a convex structure, and the convex structure can be embedded in the curved sealing groove.

Optionally, the cross section of the curved sealing groove is U-shaped, and the curved sealing groove is arranged extending from the kiln head to the kiln tail of the kiln body.

Optionally, small holes are evenly distributed on the curved sealing groove.

Optionally, the partition wall is provided with a gas distribution chamber and an injector, and the gas distribution chamber is configured to disperse gas through the gas injection port and eject through the injector.

Optionally, the first atmosphere adjustment chamber and the second atmosphere adjustment chamber are respectively equipped with a carrier driving device.

Optionally, the vehicle driving device includes a drag chain and a hydraulic propeller.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic front view of the structure of a multi-channel wheel-rail tunnel kiln in an embodiment of the present application.

FIG. 2 is a schematic structural diagram of a cross-section of the kiln body in the multi-channel wheel-rail tunnel kiln of FIG. 1 .

FIG. 3 is a schematic top view of the multi-channel wheel-rail tunnel kiln of FIG. 1 .

FIG. 4 is a schematic top-view structure diagram of another multi-channel wheel-rail tunnel kiln in the example of the application.

FIG. 5-a is a schematic structural diagram from a first perspective of a first gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application.

FIG. 5-b is a schematic structural diagram of the first gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application from a second perspective.

FIG. 6-a is a schematic structural diagram of the second gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application from a first perspective.

FIG. 6-b is a schematic structural diagram of the second gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application from a second perspective.

FIG. 7-a is a schematic structural diagram of the third gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application from a first perspective.

FIG. 7-b is a schematic structural diagram of the third gas control method in the kiln body of the multi-channel wheel-rail tunnel kiln in the example of the application from a second perspective.

Reference numerals: 2-saggar; 4-furnace; 5-inlet airtight gate; 7-first airtight gate; 9-second airtight gate; 10-outlet airtight gate; 11-electric heater; 12a - first moving mechanism; 12b - second moving mechanism; 13 - drag chain; 14 - hydraulic propeller; 15 - track; 16 - kiln roof; 24 - first atmosphere adjustment chamber; 25 - second atmosphere adjustment chamber; 26 - first conditioning chamber shell; 27 - second conditioning chamber shell; 28 - kiln shell; 31 - gas distribution chamber; 32 - syringe; 32a - gas injection port; 33 - gas injection mechanism; 101 - gas extraction mechanism; 101a - Air suction port; 171-left wall; 172-right wall; 173-partition; 900-curved groove; 901-kiln cavity; 902-drive mechanism; 903-gas channel.

Detailed ways

The cathode materials of batteries such as lithium-ion batteries need to be calcined during the production process, and many other types of cathode materials, such as high nickel ternary or lithium iron phosphate, have higher requirements on the calcination atmosphere during high temperature calcination. Therefore, how to calcine materials with high efficiency and high quality to make cathode materials is a problem that needs to be carefully considered.

In response to the above requirements, after researching the existing calcining equipment (mainly tunnel kilns), the inventor proposed a multi-channel wheel-rail tunnel kiln. It is worth noting that although the present application proposes the tunnel kiln based on calcination to produce the positive electrode material, this does not constitute a limitation on its use. That is, the tunnel kiln is also suitable for the calcination of other materials, such as calcined ceramics, inorganic material powder or other alloy materials, etc. In addition, other operations such as annealing treatment can also be performed, and the application mode of the tunnel kiln is not limited in this application.

Referring to Figures 1 to 3, the multi-channel wheel-rail tunnel kiln mainly includes a kiln body, two atmosphere adjustment chambers (for the convenience of distinction and description, respectively denoted as the first atmosphere adjustment chamber 24 and the second atmosphere adjustment chamber 25), the kiln Outer casing 28 and atmosphere control device. Among them, the kiln shell 28 hermetically wraps the kiln body, so as to reduce or even completely avoid the adverse effect of disturbing the calcination atmosphere caused by the outside gas entering the kiln body. The atmosphere control device is configured to adjust the atmosphere in the kiln to meet the actual calcination needs of the cathode material, for example, to adjust the process gas required for the calcination. The two atmosphere adjustment chambers are respectively connected to the kiln head and the kiln tail of the kiln body, so as to adjust the gas in the process of conveying the positive electrode material, so as to prevent the outside gas from entering the kiln body from the kiln head or the kiln tail and disturb the calcination atmosphere. In addition, the positive electrode material can be efficiently and quickly transported in the tunnel kiln without introducing interfering gas through the structural structure of the atmosphere adjustment chamber. In general, the positive electrode material can be produced with high yield and high quality through the cooperation of the various components in the tunnel kiln.

In the multi-channel wheel-rail tunnel kiln, generally, a kiln car can be selected as the conveying equipment (also referred to as a carrier) of the positive electrode material. And, in practical application, the calcined material can be loaded on the carrier through various containers (eg, the saggar 2). During the calcination operation, the container filled with the calcined material is placed on the carrier, and the two enter the first atmosphere adjustment chamber together from outside the tunnel kiln. After the atmosphere is adjusted in the first atmosphere adjustment chamber, it enters the kiln for calcination, and then enters into the second atmosphere adjustment chamber. After that, the carrier leaves the second atmosphere adjustment chamber to adjust the atmosphere to complete the calcination process.

Combined with the above use process, the following detailed description of each component in the multi-channel wheel-rail tunnel kiln.

The kiln body extends from the kiln head (the inlet of the material to be calcined) to the kiln tail (the outlet of the calcined material). Therefore, for the convenience of description, the direction from the kiln head to the kiln tail can be defined as the length direction, and at the same time, the section at any position in the aforementioned length direction can be defined as the width direction, that is, from one side of the furnace wall to the width of the furnace wall. The direction of the other side is defined as the width direction, and the direction from the kiln bottom to the kiln top 16 is defined as the height direction. Figure 1 shows the distribution of the various components of the tunnel kiln along its length. Among them, two atmosphere adjustment chambers are located at the beginning and end of the kiln body respectively.

The kiln body is mainly composed of furnace walls, and has a furnace chamber 4 as shown in FIG. 1 enclosed and defined by the furnace walls. The furnace wall therein includes, for example, a left wall 171 , a right wall 172 and a kiln roof 16 , as shown in FIG. 2 .

As shown in FIG. 2 , the furnace chamber 4 also has a partition wall 173, which is generally located in the middle of the width direction of the kiln body. Of course, it can also be located in other positions, which is not limited here; and the upper part of the partition wall 173 is in contact with the kiln roof 16. (or combined), the lower part of the partition wall 173 is in contact with (or combined with) the airtight outer shell of the kiln bottom. Thus, the partition wall 173 divides the furnace 4 into a plurality of channels independent of each other (so that the gas is isolated). The number of channels is at least two, and the number of channels varies according to the number of partition walls 173 . In the illustrated structure of the present application, a partition wall 173 is provided in the furnace 4 , and the furnace 4 is divided into two kiln cavities 901 . In practical applications, each kiln cavity 901 may have an independent partition wall 173, or two adjacent kiln cavities 901 may share a partition wall 173 (the illustrated solution in the example of the present application). In a specific example, the construction mode of the partition wall 173 can be adjusted as required, such as its thickness, shape, and the like. By sharing the partition walls 173, the number of partition walls 173 can be reduced, thereby reducing the manufacturing cost of the kiln, and improving the space utilization rate in the furnace cavity of the kiln body, which is beneficial to calcining more materials; at the same time, this design also Helps to centrally arrange various pipelines, etc.

By dividing the furnace chamber 4 of the kiln body into at least two kiln cavities 901 of the required number, each kiln cavity 901 can process different types of cathode materials, and of course can process the same type of cathode materials at the same time, thereby improving the flexibility of its use , Convenience. For example, different kiln cavities 901 can be configured to produce different cathode materials, respectively pass the process gas required by the respective cathode materials, and transport the respective cathode materials, so as to realize the simultaneous processing of different types of cathode materials. That is, by using the partition wall 173 to divide into a plurality of relatively independent kiln cavities 901, the tunnel kiln in some examples of the present application can process different types of cathode materials at the same time, or perform different calcination processes.

There are rails 15 in the furnace chamber 4 of the kiln body, please refer to FIGS. 1 to 3 . The track 15 is laid on the bottom of the kiln cavity 901 . In the example of the present application, the rail 15 is erected on the inner surface of the kiln shell 28 at the bottom of the kiln cavity 901 . In this way, the air tightness of the kiln body will not be affected due to the laying of tracks at the bottom of the kiln cavity 901 . Alternatively, the length of the track 15 may be limited within the kiln body, not extending beyond the kiln body. In addition, optionally, the number of rails 15 is the same as the number of kiln cavities 901 , that is, each kiln cavity 901 is provided with one auxiliary rail 15 . Of course, in practical applications, each kiln cavity 901 may additionally be provided with a spare track, etc., which is not limited here.

The outside of the kiln body is wrapped with a kiln shell 28 configured to seal it. The kiln shell 28 can be provided with through holes, grooves and other structures as required, so as to install various equipment. Exhaust pipes that discharge gas from the kiln body to the outside of the tunnel kiln, etc. Alternatively, based on calcination requirements, a heating device can be provided in the kiln body, for example, an electric heater 11 is inserted into the furnace cavity from the kiln outer shell 28 through the top of the furnace wall, see FIGS. 1 and 2 . In practical applications, the heating device can be electrically heated in the form of a heating rod, or a radiant tube with heat can be used for combustion heating, and the heater can also be a product such as a resistance heater, which is not limited here.

In addition, as a measure to improve the temperature distribution (thermal field) in the kiln body, the furnace wall of the kiln body can also be appropriately structurally modified. For example, in some examples, at the kiln bottom of the kiln body (or near the track 15 ), the furnace wall is structurally modified to set the structure of the curved sealing groove 900 as shown in FIG. 2 . That is, a curved sealing groove 900 is arranged at the bottom of the furnace wall. The curved sealing groove 900 can be matched with the carrier (as shown in Fig. 5-a, Fig. 6-a and Fig. 7-a), so that the carrier can be cut off during the traveling process, thereby minimizing the transfer of upper and lower heat. And does not hinder the normal travel of the vehicle.

A tight fit is formed between the kiln wall and the carrier, but there is a gap required for the thermal expansion of the material. Optionally, the size of the gap can be, for example, about 15 mm. Gap required for thermal expansion. At the same time, the gap is configured to form a pressure difference between the top and bottom of the carrier table, so that the inlet pressure at the bottom of the carrier is slightly greater than the pressure in the upper space of the carrier table, so that the curved sealing groove 900 forms an air curtain, thereby preventing the furnace cavity on the upper part of the carrier table. The internal exhaust gas sinks to the cryogenic space below the carrier table. The curved sealing groove 900 of the kiln wall can be selected by splicing multiple pieces of high-temperature refractory materials, and small holes are evenly distributed in the middle position to inject a small amount of process gas to help strengthen the air curtain effect.

As a structure that cooperates with the curved sealing groove 900 to realize the partition, the carrier may have a convex structure. When the carrier walks on the track 15, optionally, a gear with a motor such as a motor can be matched with a rack, and the driving mechanism 902 can be used to realize the carrier walking on the track 15. The protruding structure can be embedded in as shown in FIG. 2 . The curved seal groove 900. The cross-section of the curved seal groove 900 may be substantially U-shaped, and it is arranged to extend along the length of the kiln body, thereby allowing the carrier to travel through the kiln body. The combination of the configuration of the curved sealing groove 900 and the refractory and thermal insulation materials laid on the carrier table can prevent the high temperature in the furnace cavity on the upper part of the carrier table from being transmitted to the lower part of the carrier table, and prevent the heat to other components under the carrier table. damage.

The airtight design of the kiln body can be achieved through the structure of the kiln shell 28, but when the carrier enters and leaves the kiln body, impurity gas or interfering gas or non-process gas may also be introduced from the outside, and thus affect the atmosphere control in the kiln body. . Based on this, an atmosphere adjustment chamber is equipped at the kiln head and the kiln tail respectively.

The furnace wall at the kiln head is connected to the first atmosphere adjustment chamber 24 through the first airtight gate 7 . In order to replace the internal gas, an airtight gate, such as the inlet airtight gate 5, is also correspondingly arranged at the inlet of the first atmosphere adjustment chamber 24, as shown in FIG. 1 . The first atmosphere adjustment chamber 24 has a first internal passage, and it communicates with the kiln cavity 901 of the kiln body through the first airtight gate 7 (of course, it can also be blocked). The first atmosphere adjustment chamber 24 can replace the gas in the first atmosphere adjustment chamber 24 with the process gas that is consistent with the kiln cavity, so that when the carrier enters the kiln cavity 901 from the first atmosphere adjustment chamber 24, it will not enter the kiln cavity 901. Impurity gas or interfering gas or non-process gas is introduced into the kiln cavity 901 . And, based on this, the first atmosphere adjustment chamber 24 has a gas adjustment system (not shown in the figure), for example, the gas adjustment system can be realized by conventional structures such as a vacuum machine, a blower, a ventilation channel, etc., which is not specified in this application. Qualify and detail.

In addition, corresponding to a kiln body having a plurality of furnace cavities, the first inner channel of the first atmosphere adjustment chamber 24 may be an independent channel, as shown in FIG. 4 . Therefore, in such equipment, the tunnel kiln can simultaneously calcine the same cathode material in different kiln cavities 901 . In other examples, the tunnel kiln may simultaneously calcine different cathode materials in different kiln cavities 901 . For calcining different cathode materials or calcining the same cathode material in different kiln cavities 901 at the same time, but when the calcining atmosphere used in different kiln cavities 901 is inconsistent, the above-mentioned first internal passage can be configured to be different from the kiln cavity. A plurality of first sub-channels with the same number of 901 and independent of each other, as shown in FIG. 3 . In these examples, the first atmosphere conditioning chamber 24 may be constituted by two independent conditioning chambers (as shown in FIG. 3 ). In actual implementation, the two mediation chambers can also be connected to each other.

As some beneficial improvements, the tunnel kiln can also be configured with a first conditioning chamber shell 26, which air-tightly wraps the first atmosphere conditioning chamber 24 to enhance its air-tightness. In addition, the end of the kiln shell 28 can be selectively connected to the first conditioning chamber shell 26 , so that the first airtight gate 7 can be sealed, so as to deal with the possible gas leakage problem at the first airtight gate 7 .

In addition, since the carrier needs to enter the kiln cavity 901 of the kiln body through the first internal passage of the first atmosphere adjustment chamber 24, and the track 15 in the kiln body does not extend outside the kiln body, in order to make the carrier To smoothly transfer outside the tunnel kiln and between the kiln body, a first moving mechanism 12a is provided in the first inner passage, as shown in FIG. 1 . The first moving mechanism 12a can move freely in the first inner passage (the left and right directions shown in the figure), for example, in the direction from the first atmosphere adjustment chamber 24 to the kiln body, or along the direction from the kiln body to the first atmosphere adjustment chamber 24 directional movement. At the same time, the first moving mechanism 12a can also be docked with the rail 15 in the kiln body, for example, the first moving mechanism 12a is docked with the end of the rail 15 .

As an optional example, the first moving mechanism 12a includes a guide rail and a driving device (not shown) matched with it. Therefore, the way that the first moving mechanism 12a is docked with the rail 15 in the kiln body may be that the end of the guide rail is in contact with the end of the rail 15, thereby forming a "continuous" "road" for the carriers to travel. After the carrier is transported into the kiln, the first moving mechanism 12a can move back, for example, to the entrance of the first atmosphere adjustment chamber 24, so as to wait for the carrier outside the next tunnel kiln. In addition, when the first atmosphere adjustment chamber 24 needs to perform gas replacement, the first moving mechanism 12a will stay at the designated position in the first inner channel, and its position will not affect the two sides of the first atmosphere adjustment chamber 24. The airtight gate is closed and sealed.

The number and arrangement positions of the first moving mechanisms 12a can be adjusted correspondingly according to different construction modes of the first internal passage of the first atmosphere adjustment chamber 24 . For example, when a plurality of first sub-channels corresponding to the kiln cavity 901 of the kiln body are provided in the first inner channel of the first atmosphere adjustment chamber 24, a plurality of first moving mechanisms 12a may be correspondingly configured. In other words, each of the first sub-channels has a first moving mechanism 12a.

As an optional solution, in order to facilitate the “push” of the carrier (such as the kiln car) carrying the container (such as the saggar 2) carrying the calcined material onto the first moving mechanism 12a in the first atmosphere adjustment chamber 24, or the The carrier is “pushed” into the kiln cavity 901 of the kiln body from the first moving mechanism 12a in the first atmosphere adjustment chamber 24, and a vehicle driving device (such as a conventional dragging device can also be configured in the first atmosphere adjustment chamber 24). Chain 13 and hydraulic propeller 14, see Figure 1). The drag chain 13 is configured to drag the carrier outside the tunnel kiln to the first moving mechanism 12a in the first atmosphere adjustment chamber 24 ; the hydraulic pusher 14 is configured to push the vehicle in the first atmosphere adjustment chamber 24 into the kiln cavity 901 of the kiln body.

Similar to the first atmosphere adjustment chamber 24, a second atmosphere adjustment chamber 25 having a second internal passage is provided at the kiln end of the kiln body. In addition, the second atmosphere adjustment chamber 25 is connected to the furnace wall at the kiln end through the second airtight shutter 9 . In order to replace the internal gas, an airtight gate, such as the outlet airtight gate 10 , is also correspondingly arranged at the outlet of the second atmosphere adjustment chamber 25 . The second inner passage communicates with the kiln cavity 901 of the kiln body, so that the carrier can enter into it from the kiln end. And, corresponding to the usage mode, the second internal channel can be either an independent channel, or can be divided into a plurality of second sub-channels which are independent of each other and are the same as the number of the kiln cavities 901 of the kiln body.

In addition, there is also a second movement mechanism 12b (which may be one or more) capable of butt engagement with the rail 15 and also movable within the second inner channel, configured to transfer the carrier from the kiln body. Therefore, the number of the second moving mechanisms 12b can be set according to the configuration of the second inner channel, for example, the second moving mechanism 12b may be one (corresponding to the example with one second sub-channel), or multiple (corresponding to the example with multiple second sub-channels). Further, as mentioned above, in order to push the carrier up or down the second moving mechanism 12b, two energy chains 13 arranged in opposite directions may be arranged in the second atmosphere adjustment chamber 25; one of them is configured to move the carrier from The kiln body is dragged into the second moving mechanism 12b of the second atmosphere adjustment chamber 25, and the other is configured to drag the carrier out of the second atmosphere adjustment chamber 25 to the outside of the tunnel kiln.

In other examples, the outer surface of the second atmosphere adjustment chamber 25 may also wrap the second adjustment chamber shell 27 to improve air tightness. Further, at the connection between the second atmosphere adjustment chamber 25 and the kiln tail of the kiln body, airtight connection parts can also be used for sealing connection, so as to deal with the situation of gas leakage from the second airtight gate 9 . In the foregoing description of the second atmosphere adjustment chamber 25 , if there are other structures and internal structures that are not mentioned or described in detail, reference may be made to the first atmosphere adjustment chamber 24 , which will not be repeated here. All in all, the air-tightness of the tunnel kiln can be further improved by wrapping the two atmosphere adjustment chambers with air-tight casings (to avoid being affected by disturbing gases). The air-tightness of the tunnel kiln can also be improved by connecting the kiln shell that wraps the kiln body to the regulating chamber shell. For example, avoid gas leakage that may occur at the connection between the atmosphere conditioning chamber and the airtight gate of the kiln body.

For atmosphere control in the calcination process, the multi-channel wheel-rail tunnel kiln in the present application is equipped with an atmosphere control device. And, it mainly includes the gas injection mechanism 33 and the gas extraction mechanism 101 . The gas injection mechanism 33 is configured to inject process gas into the furnace cavity of the kiln body; the gas extraction mechanism 101 is configured to extract the waste gas, water vapor, etc. in the furnace cavity from the furnace cavity. For example, the gas injection mechanism 33 has a gas injection port 32a configured to inject process gas; the gas suction mechanism 101 has a gas suction port 101a configured to discharge exhaust gas to the outside of the tunnel kiln (can be combined with the exhaust channel 101 for suction).

In the example of the present application, the positions of the gas injection mechanism 33 and the gas extraction mechanism 101 in the multi-channel wheel-rail tunnel can be independently selected, and the convenience of placement, the control effect of atmosphere and temperature, etc. can be considered during the position selection process. For example, the two independently control the atmosphere in the entire kiln cavity 901 through the furnace wall and the partition wall 173 .

In some examples, the gas injection port 32a of the gas injection mechanism 33 is provided on the partition wall 173, and the gas extraction port 101a of the gas extraction mechanism 101 is provided on the furnace wall. Therefore, in such an example, the process gas is ejected from the partition wall 173 into the furnace cavity, passing through the saggar 2 loaded with the calcined material. The exhaust gas and the like are drawn and discharged from the furnace wall (mainly the furnace wall in the width direction). And, in some improved examples, the partition wall 173 may be provided with a gas distribution chamber 31 configured to disperse the gas through the gas injection port 32a through the injector 32, see Figures 5-a and 5-b.

Alternatively, in some other examples, the gas injection port 32 a of the gas injection mechanism 33 is provided on the furnace wall, and the gas extraction port 101 a of the gas extraction mechanism 101 is provided on the partition wall 173 . Therefore, the process gas is blown out from the furnace wall, enters the furnace cavity, passes through the saggar 2 loaded with the calcined material, enters the partition wall 173, and is finally extracted out of the furnace cavity. Therefore, the above-mentioned injector 32 and gas distribution chamber 31 can be arranged on the furnace wall (eg, the left wall 171 and the right wall 172 ), see FIGS. 6-a and 6-b.

Alternatively, the gas injection ports 32a of the gas injection mechanism 33 are respectively provided on the furnace wall and the partition wall 173, and the gas extraction ports 101a of the gas extraction mechanism 101 are respectively provided on the furnace wall and the partition wall 173, see Figures 7-a and 7-b.

In some examples, when the air extraction port 101a of the air extraction mechanism 101 is arranged on the partition wall 173, the air extraction port 101a can be selected to lead out the air outlet from the bottom of the kiln body. That is, a gas channel 903 is opened at the bottom of the kiln body (as shown in Fig. 6-a and Fig. 7-a), and the end of the gas channel 903 constitutes an exhaust port. The exhaust port 101a communicates with the gas passage 903, and thus can discharge exhaust gas through the exhaust port.

The gas injection port 32a of the gas injection mechanism 33 and the gas extraction port 101a of the gas extraction mechanism 101 can be provided as many as needed, and according to the specific size and structure of the kiln body, appropriate spatial location arrangements are made to achieve uniform delivery of process gas and discharge simultaneously. exhaust to control temperature.

For example, in the height direction of the kiln body, from the kiln bottom to the kiln top 16, the gas injection mechanism 33 has a plurality of gas injection ports 32a. And these gas injection ports 32a are arranged in layers at intervals. For convenience of description, these gas injection ports 32a may be referred to as a gas injection group. That is, each gas injection port 32a in a gas injection group is distributed at intervals along the section of the kiln body. Meanwhile, in the longitudinal direction of the kiln body, a plurality of gas injection groups of the gas injection mechanism 33 are distributed at intervals. That is, multiple gas injection groups are arranged from the kiln head to the kiln tail of the kiln body. In other words, the gas injection mechanism 33 includes a plurality of gas injection groups arranged from the kiln head to the kiln tail of the kiln body, and each gas injection group includes a plurality of gas injection ports 32a, and the plurality of gas injection ports 32a are distributed on the cross section of the kiln body and It is arranged along the kiln bottom of the kiln body to the kiln top.

Correspondingly, the air extraction mechanism 101 may also have a similar distribution manner. That is, the air extraction mechanism 101 may have a plurality of air extraction groups, and each air extraction group is arranged along the direction of the kiln body from the kiln head to the kiln tail. Meanwhile, each air extraction group has a plurality of air extraction ports 101a. All the air extraction ports 101a in the same air extraction group are arranged along the height direction of the kiln body, from the kiln bottom to the kiln top 16 . In other words, the air extraction mechanism 101 includes a plurality of air extraction groups arranged from the kiln head to the kiln end of the kiln body, and each air extraction group includes a plurality of air extraction ports, and the plurality of air extraction ports are distributed on the section of the kiln body and along the kiln body. The body is arranged from the bottom of the kiln to the top of the kiln.

In other examples, each extraction group shares a single extraction port. In other words, the number of air extraction ports of the plurality of air extraction groups may be one, or may be two or three or more.

In some examples, on the section of the kiln body, the gas injection group and the gas extraction group are arranged opposite to each other. For example, in the width direction of the kiln body, the gas injection port 32a and the gas extraction port 101a are in the same direction. For example, the axis of the gas injection port 32a is collinear with the axis of the gas suction port 101a, as shown in Fig. 6-b. Alternatively, the gas injection port 32a and the gas suction port 101a may not be strictly opposed to each other, but deviated from each other by a certain distance.

In the above example, the description is mainly given by taking the furnace wall or partition wall 173 in which all the gas injection ports 32a are located on the same side as an example. For example, only the gas injection port 32a is provided in the left furnace wall in the width direction of the kiln body, only the gas injection port 32a is provided in the right furnace wall in the width direction of the kiln body, and at the same time, only the gas extraction port is provided in the partition wall 173 in the kiln body 101a. Alternatively, only the air extraction port 101a is provided on the left furnace wall in the width direction of the kiln body, only the air extraction port 101a is provided on the right furnace wall in the width direction of the kiln body, and at the same time, the partition wall 173 in the kiln body is provided with only the air injection port 32a. It should be noted that "only provided" refers to the gas injection port 32a and the gas suction port 101a. It should be understood that other various devices may be provided on the partition wall 173 and the furnace wall, such as gas sensors, temperature sensors, dampers, etc., which are not limited herein.

In some other examples of the present application, the gas injection ports 32a of the gas injection mechanism 33 and the gas extraction ports 101a of the gas extraction mechanism 101 may be alternately arranged in the length direction of the kiln body. For example, the furnace wall has both the gas injection port 32a and the gas exhaust port 101a; or, the partition wall has both the gas injection port 32a and the gas exhaust port 101a; or both. More specifically, in the length direction of the kiln body, the gas injection groups and the gas extraction groups can be arranged alternately, as shown in Figure 7-b. The alternate arrangement of the gas injection group and the gas extraction group helps to improve the balance of the thermal field and the airflow field in the kiln cavity in the kiln body, and to improve the consistency of the overall temperature and atmosphere.

During the calcination process, process gas is injected into the kiln cavity 901 of the kiln body. The type of process gas mainly depends on the material to be calcined and is not limited here.

Outside the tunnel kiln, the saggar 2 is filled with positive electrode material and placed in a stack on a carrier. The carrier is then moved close to the entrance of the first atmosphere conditioning chamber 24 . The airtight gate 5 at the entrance of the first atmosphere adjustment chamber 24 is opened, and the first moving mechanism 12a therein moves toward the entrance of the first atmosphere adjustment chamber 24, and drags the carrier into the first atmosphere adjustment chamber 24 through the drag chain 13 on the first moving mechanism 12a. Then the inlet airtight gate 5 is closed, the first atmosphere adjustment chamber 24 is closed, and the atmosphere therein is replaced with the same atmosphere in the kiln body, and the first airtight gate 7 between the first atmosphere adjustment chamber and the kiln body is opened. The first moving mechanism 12a moves toward the kiln body so as to abut with the rail 15 in the kiln body. Then, the carrier and the saggar 2 are pushed into the track 15 in the kiln body by the hydraulic pusher 14, the first moving mechanism 12a returns to the designated position, and the airtight first airtight gate 7 is closed. Subsequent carriers that enter the kiln body through the first atmosphere adjustment chamber 24 can push the previous carrier that first entered the kiln body to move forward (towards the kiln end). As the carriers successively enter the kiln body from the first atmosphere adjustment chamber 24 , the carriers that enter the kiln body first are pushed to the kiln end. At this time, the gas in the second atmosphere adjustment chamber 25 can be replaced with the same atmosphere as the atmosphere in the kiln. Then, the airtight second airtight gate 9 between the kiln body and the second atmosphere adjustment chamber 25 is opened, and the second moving mechanism 12b moves to the kiln tail to connect with the track 15 at the kiln tail, and then use the drag chain 13 The carrier at the kiln end is dragged into the second moving mechanism 12b in the second atmosphere adjustment chamber 25 . Then, the second moving mechanism 12b moves to the exit position of the second atmosphere adjustment chamber 25, and the second airtight shutter 9 is closed. The outlet airtight gate 10 of the second atmosphere adjustment chamber 25 is opened, and then another drag chain 13 is used to drag the vehicle out. Finally, the outlet airtight gate 10 is closed, and the second atmosphere adjustment chamber 25 is replaced by gas, ready to accept the next vehicle vehicle.

To sum up, the tunnel kiln proposed in this application at least includes the following main advantages:

First of all, the tunnel kiln proposed in the present application is connected to the atmosphere adjustment chamber through airtight gates at the kiln head and the kiln tail of the kiln body respectively. Therefore, when conveying materials, the two atmosphere adjustment chambers can adjust the atmosphere, and then make the materials enter or leave the kiln body, so that unnecessary gas (such as impurity gas) will not be introduced into the kiln body during the material conveying process. ). At the same time, the kiln shell can seal the kiln body, and also isolate the atmosphere from outside interference in the kiln body.

Combining the above-mentioned structural design for isolating the influence of interfering gas and the structural design for efficiently conveying materials, the multi-channel wheel-rail tunnel kiln can have a larger output. Moreover, due to the multiple channels, when an accident occurs in one channel and the production needs to be stopped for maintenance, the normal production of the other channel will not be affected, so the loss of production capacity is smaller. Furthermore, multi-pass can also be suitable for simultaneous calcination of different materials, which can then be directly entered into subsequent steps for processing, eg, mixing, of these different materials. That is, through the parallel calcination process, the problem of low efficiency of the serial calcination process can be effectively overcome.

Optionally, the air-tightness of the tunnel kiln can be further improved (to avoid being affected by disturbing gases) by wrapping the two atmosphere adjustment chambers with an air-tight outer shell as well. The air-tightness of the tunnel kiln can also be improved by connecting the kiln shell that wraps the kiln body to the regulating chamber shell. For example, avoid gas leakage that may occur at the connection between the atmosphere conditioning chamber and the airtight gate of the kiln body.

Optionally, the internal channels of the atmosphere adjustment chamber are correspondingly arranged as independent multiple sub-channels based on the structure of the kiln cavity of the kiln body, so as to facilitate the calcination operation in different channels according to different calcination requirements. For example, different atmospheres are injected into different kiln cavities to calcine different materials.

Optionally, by sharing a partition wall between two adjacent kiln cavities, the number of partition walls can be reduced, thereby reducing the manufacturing cost of the kiln, and improving the space utilization rate in the furnace cavity in the kiln body, which is beneficial to the More materials are calcined; at the same time, this design also helps to centrally arrange various pipelines, etc.

Optionally, the gas injection groups and the gas extraction groups can be alternately arranged in the length direction of the kiln body, as shown in Figure 7-b. The alternate arrangement of the gas injection group and the gas extraction group helps to improve the balance of the thermal field and the airflow field in the kiln cavity in the kiln body, and to improve the consistency of the overall temperature and atmosphere.

Optionally, the furnace wall is provided with a curved sealing groove, and the configuration of the curved sealing groove and the refractory and thermal insulation materials laid on the carrier table can prevent the high temperature in the furnace cavity on the upper part of the carrier table from being transmitted to the bottom of the carrier table, preventing Thermal damage to other components below the carrier deck.

It should be noted that, in the above description of the present application, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the drawings The orientation or positional relationship of the application, or the orientation or positional relationship that the product of the application is usually placed in use, is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, It is constructed and operated in a particular orientation and therefore should not be construed as a limitation of the present application. Furthermore, the terms "first", "second", etc. are only used to differentiate the description and should not be construed to indicate or imply relative importance.

In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

In this application, all the embodiments, implementations and features of this application can be combined with each other without contradicting or conflicting. In this application, conventional equipment, devices, components, etc., can be either commercially available, or can be self-made according to the content disclosed in this application. In this application, in order to highlight the key points of the application, some conventional operations, equipment, devices, and components are omitted, or only briefly described.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Industrial Applicability:

The multi-channel wheel-rail tunnel kiln of the present application does not introduce unnecessary gas (such as impurity gas) into the kiln body during the material conveying process, and simultaneously isolates the atmosphere from outside interference in the kiln body. Therefore, the multi-channel wheel-rail tunnel kiln can have a larger output in combination with the structural design of isolating the influence of interfering gas and the structural design of efficiently conveying materials.

Claims

A multi-channel wheel-rail tunnel kiln is characterized in that, comprising:

The kiln body has a furnace wall, a partition wall and a rail, the furnace wall defines a furnace chamber and is divided into at least two kiln cavities corresponding to the rails by the partition wall, and the rails are located inside the kiln cavity ;

A first atmosphere conditioning chamber with a first inner passage is connected to the furnace wall at the kiln head through a first airtight gate, and the first inner passage is connected to the at least two The kiln cavity is optionally connected or isolated;

A second atmosphere conditioning chamber having a second inner passage connected to the furnace wall at the kiln end through a second airtight gate, and the second inner passage is connected to the at least two The kiln cavity is optionally connected or isolated;

a kiln shell that hermetically wraps the kiln body;

An atmosphere control device, having a gas injection mechanism and a gas extraction mechanism for controlling the atmosphere in the at least two kiln cavities in a linkage manner, the gas injection mechanism and the gas extraction mechanism are respectively independently arranged on the furnace wall and/or the the partition wall.
The multi-channel wheel-rail tunnel kiln according to claim 1, characterized in that, the tunnel kiln comprises: a first conditioning chamber shell airtightly wrapping the first atmosphere conditioning chamber, The second conditioning chamber housing of the second atmosphere conditioning chamber.
The multi-channel wheel-rail tunnel kiln according to claim 2, characterized in that, both ends of the kiln shell are airtightly connected to the first regulating chamber shell and the second regulating chamber shell, respectively.
The multi-channel wheel-rail tunnel kiln according to any one of claims 1 to 3, characterized in that, there is a movable first moving mechanism in the first inner channel that can be butt-fitted with the rail;

And/or, there is a second moving mechanism in the second inner channel that can be butt-fitted with the rail and is movable.
The multi-channel wheel-rail tunnel kiln according to any one of claims 1 to 4, wherein the first inner channel is a plurality of first sub-channels that are independent of each other in number with the at least two kiln cavities aisle;

And/or, the second inner channel is a plurality of second sub-channels that are independent of each other in number consistent with the at least two kiln cavities.
The multi-channel wheel-rail tunnel kiln according to claim 5, wherein the first inner channel has a movable first moving mechanism capable of butt-matching with the rail, and the first moving mechanism including a plurality of first sub-moving mechanisms respectively located in the plurality of first sub-channels;

And/or, in the second inner channel, there is a second moving mechanism capable of butt-matching with the rail and movable, and the second moving mechanism includes a plurality of The second sub-moving mechanism.
The multi-channel wheel-rail tunnel kiln according to any one of claims 1 to 6, wherein the gas injection port of the gas injection mechanism is arranged on the partition wall, and the gas suction port of the gas extraction mechanism is arranged on the furnace wall;

Or, the gas injection port of the gas injection mechanism is arranged on the furnace wall, and the gas suction port of the gas extraction mechanism is arranged on the partition wall;

Alternatively, the gas injection ports of the gas injection mechanism are respectively arranged on the furnace wall and the partition wall, and the gas suction ports of the gas extraction mechanism are respectively arranged on the furnace wall and the partition wall.
The multi-channel wheel-rail tunnel kiln according to claim 7, wherein when the air extraction port of the air extraction mechanism is located on the partition wall, the air extraction port is led out from the bottom of the kiln body through the air extraction port .
The multi-channel wheel-rail tunnel kiln according to claim 7, wherein the gas injection mechanism comprises a plurality of gas injection groups arranged along the kiln head to the kiln tail of the kiln body, and each of the gas injection groups Including a plurality of gas injection ports, the plurality of gas injection ports are distributed on the section of the kiln body and are arranged along the kiln bottom to the kiln top of the kiln body;

And/or, the air extraction mechanism includes a plurality of air extraction groups arranged along the kiln head to the kiln end of the kiln body, and each of the air extraction groups includes a plurality of air extraction ports, and the plurality of air extraction ports are distributed in the kiln body. The section of the kiln body is arranged along the kiln bottom to the kiln top of the kiln body.
The multi-channel wheel-rail tunnel kiln according to claim 9, wherein on the cross section of the kiln body, the gas injection group and the gas extraction group are arranged opposite to each other;

And/or, along the direction from the kiln head to the kiln tail of the kiln body, on the partition wall or furnace wall on the same side, the gas injection group in the gas injection mechanism and the gas injection group in the gas extraction mechanism. The exhaust groups are arranged alternately.
The multi-channel wheel-rail tunnel kiln according to any one of claims 1 to 10, characterized in that, at the kiln bottom of the kiln body, the furnace wall is provided with a curved sealing groove, and the curved sealing groove is structured embedded for a vehicle traveling in the multi-channel wheel-rail tunnel kiln;

And/or, two adjacent kiln cavities share one partition wall.
The multi-channel wheel-rail tunnel kiln according to claim 11, wherein the carrier is a convex structure, and the convex structure can be embedded in the curved sealing groove.
The multi-channel wheel-rail tunnel kiln according to claim 12, wherein the cross section of the curved sealing groove is U-shaped, and the curved sealing groove is arranged extending from the kiln head to the kiln tail of the kiln body.
The multi-channel wheel-rail tunnel kiln according to any one of claims 11 to 13, wherein small holes are evenly distributed on the curved sealing groove.
The multi-channel wheel-rail tunnel kiln according to any one of claims 7 to 10, wherein a gas distribution chamber and an injector are provided on the partition wall, and the gas distribution chamber is configured to disperse gas through the Gas injection port and ejection through the syringe.
The multi-channel wheel-rail tunnel kiln according to any one of claims 1 to 15, wherein the first atmosphere adjustment chamber and the second atmosphere adjustment chamber are respectively provided with a carrier driving device.
The multi-channel wheel-rail tunnel kiln according to claim 16, wherein the carrier driving device comprises a drag chain and a hydraulic propeller.