CN220541763U - Gas flow limiting device applied to kiln - Google Patents

Abstract

The utility model relates to a gas flow-limiting device applied in a kiln, comprising: the first gas flow limiting component is arranged on a carrier in the kiln, the first gas flow limiting component is provided with a through hole for avoiding a heat treatment object on the carrier, and the first gas flow limiting component is erected outside the heat treatment object, wherein: the inner contour of the first gas flow-limiting part is in profiling fit with the heat treatment object, the outer contour of the first gas flow-limiting part is close to the furnace top of the kiln, a narrow gap is reserved between the first gas flow-limiting part and the furnace top, the first gas flow-limiting part is arranged along the longitudinal extension direction of the kiln, and the first gas flow-limiting part forms a flow-limiting plane for limiting gas flow in the transverse extension direction of the kiln. The utility model can limit the flowing direction of the gas in the kiln, and ensure that all or most of the gas in the kiln can pass through the heat treatment object, thereby improving the use efficiency of the process gas in the kiln, reducing the use amount of the process gas and reducing the processing cost.

Description

Gas flow limiting device applied to kiln

Technical Field

The utility model relates to the technical field of kiln calcination equipment, in particular to a gas flow-limiting device applied to a kiln.

Background

In order to form a transverse air flow perpendicular to the length direction of the kiln in the furnace chamber of the continuous kiln, patent No. ZL202022859568.2 discloses a technology for arranging air inlet devices and air outlet devices on the kiln walls of the continuous kiln respectively, and referring to fig. 1, the air inlet devices and the air outlet devices which are arranged on the kiln walls on two sides of the kiln in an opposite mode can enable the air in the kiln chamber to flow along the transverse direction perpendicular to the length direction of the kiln. The heat treatment object, which is located in the central position of the furnace chamber, generally has a passage through which the gas flow can pass. Taking high temperature calcination of the battery cathode material as an example, the cathode material is usually placed in a sagger in a powder state. In order to increase the productivity of high temperature calcination, a plurality of saggers are generally stacked together and placed on a carrier of a continuous kiln, such as a pusher plate of a pusher kiln or a roller table of a roller kiln. To facilitate the flow of air into the sagger, the four sides of the sagger are typically notched. The side-to-side air flow through the opposed inlet and exhaust means may pass through the ceramic sagger through a first air flow path defined by the sagger gap. The gas flow transversely passing through the heat treatment object can not only make the temperature of the heat treatment object more uniform, but also convey the reaction gas required by the high-temperature solid phase reaction to the reaction interface in the sagger, thereby improving the solid phase reaction efficiency.

However, since the heat treatment objects (for example, stacks of saggers) are spaced apart from the furnace wall and the furnace roof of the continuous kiln, and there may be a certain distance between the heat treatment objects placed on the front and rear carriers, there is also a second air flow path formed between the heat treatment objects and the furnace wall and the furnace roof, and between the heat treatment objects on the front and rear carriers, between the air intake means and the air exhaust means. Since the gap between the heat treatment object itself is small, and the gap between the heat treatment object and the furnace wall and the distance between the heat treatment object on the front and rear two vehicles are large, the gas flow along the second gas flow path is smaller than that of the first gas flow path, so that in actual kiln operation, a considerable part of the gas entering the furnace chamber from the gas inlet means does not pass through the heat treatment object laterally through the first gas flow path, but flows through the second gas flow path and then enters the gas outlet means. This partial gas flow does not achieve the purpose of heating (or cooling) the heat treatment object and delivering the reaction gas to the reaction interface. This can result in significant waste of process gas.

In some continuous kilns, kiln furniture such as upright posts are used for jacking the heat treatment object from the kiln car, so that a large gap exists between the bottom of the heat treatment object and the upper surface of the kiln car, and a third air flow channel is formed. The air flow entering the furnace chamber of the kiln from the air inlet device can also flow into the air outlet device through the third air flow channel, and can not play a role in heating or cooling a heat treatment object or conveying reaction gas to a reaction interface.

Disclosure of Invention

Therefore, the utility model aims to solve the technical problem that the gas in the kiln cannot flow through the heat treatment object to cause gas waste in the prior art, and provides the gas flow limiting device applied to the kiln, which can limit the flow direction of the gas in the kiln and enable all or most of the gas in the kiln to pass through the heat treatment object, thereby improving the use efficiency of the process gas of the kiln, reducing the use amount of the process gas and reducing the processing cost.

In order to solve the technical problems, the utility model provides a gas flow limiting device applied to a kiln, comprising:

the first gas flow limiting component is arranged on a carrier in the kiln, the first gas flow limiting component is provided with a through hole for avoiding a heat treatment object on the carrier, and the first gas flow limiting component is erected outside the heat treatment object, wherein:

the inner contour of the first gas flow-limiting component is in profiling fit with the heat treatment object, the outer contour of the first gas flow-limiting component is close to the furnace top of the kiln, a narrow gap is reserved between the first gas flow-limiting component and the furnace top, the first gas flow-limiting component is arranged along the longitudinal extension direction of the kiln, and a flow-limiting plane for limiting gas flow is formed on the transverse extension direction of the kiln by the first gas flow-limiting component.

In one embodiment of the present utility model, a receiving groove is formed in the carrier, and the connection end of the first gas flow limiting component and the carrier is inserted into the receiving groove.

In one embodiment of the utility model, a plurality of vehicles connected end to end are arranged in the kiln, and two first gas flow-limiting components on two adjacent vehicles are closely attached.

In one embodiment of the present utility model, a limiting structure is disposed at a position where the two first gas flow-limiting members are tightly attached, and the two first gas flow-limiting members are in limiting connection through the limiting structure.

In one embodiment of the present utility model, the first gas flow-limiting member has a plate structure, a plurality of first gas flow-limiting members are disposed on the same plane, and a plurality of first gas flow-limiting members are spliced to form a flow-limiting plane.

In one embodiment of the utility model, the first gas flow-limiting component is of a cover structure, and the first gas flow-limiting component extends towards two side walls of the kiln.

In one embodiment of the utility model, a partition is arranged at the top of the kiln, and an opening for the first gas flow-limiting component to pass through is arranged on the partition.

In one embodiment of the utility model, a plurality of spaced support structures are provided on the carrier, a plurality of the support structures jack up the heat treatment object, and a second gas flow restriction member is provided between two adjacent support structures.

In one embodiment of the present utility model, the first gas flow restriction member and the second gas flow restriction member are both made of a high temperature resistant material, comprising: ceramic materials or graphite materials.

In one embodiment of the utility model, the kiln is a continuous kiln.

In one embodiment of the utility model, the kiln is a batch kiln comprising: box-type furnace and shuttle kiln.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

the gas flow limiting device is applied to a kiln, a first gas flow limiting component is arranged on a carrier and can move in the kiln along with the carrier, the first gas flow limiting component is arranged outside a heat treatment object in a covering way, and the gas flow limiting device is provided with a through hole for avoiding the heat treatment object, so that the gas flow can pass through the heat treatment object; and the first gas flow limiting part is arranged to form a flow limiting plane for limiting the gas flow in the transverse extending direction of the kiln, so that the gas flow cannot flow through a channel between the heat treatment object and the kiln, and the gas flow can only pass through the heat treatment object, so that all (or most) of the gas entering the furnace chamber is used for heating or cooling the heat treatment object.

The gas flow limiting device can greatly improve the use efficiency of the process gas of the kiln, and particularly for continuous kilns using special gases with relatively high cost, such as pure oxygen, pure hydrogen or argon and the like, the use amount of the process gas can be greatly reduced, so that the processing cost is reduced.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which

FIG. 1 is a schematic diagram of the prior art gas flow in a kiln;

FIG. 2 is a schematic view of the structure of the gas flow after the inventive gas flow restriction device is placed in the kiln;

FIG. 3 is a schematic view of the structure of the gas flow restrictor of the utility model applied in a kiln;

FIG. 4 is an enlarged schematic view of the structure shown at A in FIG. 3;

fig. 5 is an enlarged schematic view of the structure at B in fig. 3.

Description of the specification reference numerals: 1. a kiln; 2. a carrier; 3. heat treating the object; 4. an air intake device; 5. an air outlet device; 6. a first airflow passage; 7. a second airflow passage; 8. a third air flow passage; 9. a first gas flow restriction member; 10. a receiving groove; 11. a support structure; 12. a second gas flow restriction member; 13. partition; 14. an opening; 15. and a limiting structure.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

As described in the background art, taking a kiln car type tunnel kiln for calcining anode and cathode materials of a battery at high temperature as an example, heat treatment objects 3 (anode or cathode materials) are placed in a sagger, the sagger is stacked into a sagger stack, the sagger is placed on a carrier 2 (kiln car) of a kiln 1, the sagger runs along the length direction of the kiln 1 in a continuous kiln, an air inlet device 4 and an air outlet device 5 are respectively arranged on kiln walls at two sides of the kiln 1 in an opposite mode, air is introduced into the air inlet device 4, so that the air in a kiln cavity flows along a transverse direction perpendicular to the length direction of the kiln 1, and finally the air is discharged from the air outlet device 5;

in order to facilitate the air flow to enter the sagger, gaps are usually reserved on four sides of the sagger, and the transverse air flow formed by the opposite air inlet device 4 and the opposite air outlet device 5 can pass through the sagger through the first air flow channel 6 formed by the gaps of the sagger, so that the formed air flow transversely passing through the heat treatment object 3 can not only enable the temperature of the heat treatment object 3 to be more uniform, but also enable the reaction gas required by the high-temperature solid phase reaction to be conveyed to the reaction interface in the sagger, and improve the solid phase reaction efficiency.

However, as shown in fig. 1, since the heat-treated objects 3 (for example, sagger stacks) are spaced apart from the furnace wall and the furnace roof of the continuous kiln, and there may be a certain distance between the heat-treated objects 3 placed on the front and rear vehicles 2, there is also a second air flow path 7 formed between the heat-treated objects 3 and the furnace wall and the furnace roof, and between the heat-treated objects 3 on the front and rear vehicles 2, between the air inlet means 4 and the air outlet means 5; since the gap between the heat treatment object 3 itself is small, the gap between the heat treatment object 3 and the furnace wall and the heat treatment object 3 on the front and rear carriers 2 are large, and therefore the gas flow path resistance of the second gas flow path 7 is smaller than that of the first gas flow path 6, so that in actual operation of the kiln 1, a considerable portion of the gas entering the furnace chamber from the gas inlet means 4 flows not transversely through the heat treatment object 3 through the first gas flow path 6 but from the second gas flow path 7 and then into the gas outlet means 5. This partial gas flow does not achieve the purpose of heating (or cooling) the heat treatment object 3 and delivering the reaction gas to the reaction interface. This can result in significant waste of process gas.

Accordingly, on the basis of the above patent application, the applicant provides a gas flow restrictor applied to the kiln 1, which is capable of blocking and guiding the flow direction of the gas in the kiln 1, so that the gas introduced into the kiln 1 can be extracted from the heat treatment object 3 as much as possible: namely, the gaps of the stacked multi-layer sagger pass through, so that the use efficiency of the process gas of the kiln 1 is improved, the use amount of the process gas is reduced, and the processing cost is reduced.

Example 1

Referring to fig. 2, the present utility model provides a gas flow-limiting device applied to a kiln 1, comprising: the first gas flow limiting component 9 is arranged on the carrier 2 in the kiln 1, the first flow limiting component can be fixed on the carrier 2 and moves along with the carrier 2 in the kiln 1, the first gas flow limiting component 9 is provided with a through hole for avoiding a heat treatment object 3 on the carrier 2, the first gas flow limiting component 9 is arranged outside the heat treatment object 3, the first flow limiting component can not block gaps of stacked multi-layer saggers, and the gas flow can pass through the gaps;

specifically, the inner contour of the first gas flow limiting component 9 is arranged in a profiling and fitting way with the heat treatment object 3, so that no gap exists between the first gas flow limiting component 9 and the heat treatment object 3, the outer contour of the first gas flow limiting component 9 is arranged close to the furnace top of the kiln 1, a narrow gap is reserved between the first gas flow limiting component 9 and the furnace top, on one hand, the first gas flow limiting component 9 is arranged without being in contact with the furnace top of the kiln 1, the movement of the carrier 2 in the kiln 1 is not influenced, on the other hand, the first gas flow limiting component 9 is arranged close to the furnace top of the kiln 1 as much as possible, and the area of the second gas flow channel 7 between the first gas flow limiting component 9 and the furnace top can be reduced as much as possible, so that the gas flow passing can be effectively reduced;

specifically, the first gas flow restriction member 9 is disposed along the longitudinal extension direction of the kiln 1, and the first gas flow restriction member 9 forms a flow restriction plane restricting the flow of gas in the lateral extension direction of the kiln 1, so that the gas flow cannot flow through the passage between the heat treatment object 3 and the kiln 1, and the gas flow can only pass through the heat treatment object 3, thereby allowing all (or most) of the gas entering the furnace chamber to be used for heating or cooling the heat treatment object 3.

Referring to fig. 3, in this embodiment, a plurality of carriers 2 are disposed in the kiln 1, and although the carriers 2 can be connected end to end, the heat treatment objects 3 disposed on the carriers 2 are smaller than the carriers 2, so that an air flow channel is formed between the two heat treatment objects 3, in this embodiment, not only the first air flow limiting member 9 needs to be disposed to seal the air flow channel between the heat treatment objects 3 and the top of the kiln 1, but also the air flow channel between the adjacent heat treatment objects 3 needs to be sealed, so that two first air flow limiting members 9 on the adjacent two carriers 2 need to be disposed to be closely attached;

in this embodiment, since the vehicles 2 are connected end to end, only the front and rear ends of the outer contour of the first gas flow restriction member 9 need to be consistent with the front and rear edges of the vehicles 2; in this way, in the furnace chamber of the kiln 1, the vehicles 2 are mutually propped against each other, and the first gas flow-limiting parts 9 on the front and rear vehicles 2 can be closely contacted without gaps.

Referring to fig. 5, in order to make the two first gas flow-limiting members 9 closely attach, a limiting structure 15 is disposed at a position where the two first gas flow-limiting members 9 closely attach, and the two first gas flow-limiting members 9 are in limiting connection by the limiting structure 15, and the limiting structure 15 is disposed, so that on one hand, the positioning of the front and rear first gas flow-limiting members 9 can be assisted to form a plane, and on the other hand, the stability of the plane can be maintained when the carrier 2 travels.

Specifically, in this embodiment, the limiting structure 15 is configured as a concave-convex opposite-insertion limiting structure, if the edges of the front and rear first airflow limiting members 9 cannot be tightly attached due to a dimensional error in manufacturing or installation, the airflow rate passing through the gap can be reduced due to the meandering gap formed by the concave-convex edges.

In other embodiments, the limiting structure 15 may be a broken line structure, a wave structure, or a tooth structure, as long as the limiting connection can be implemented.

Specifically, in this embodiment, the first gas flow-limiting members 9 are configured in a plate-like structure, because the plurality of first gas flow-limiting members 9 are respectively disposed on the plurality of different vehicles 2, if the plurality of first gas flow-limiting members 9 are disposed in a staggered manner, a staggered gas flow channel is formed in space, and the gas flow cannot be blocked, so that the position of the first gas flow-limiting member 9 in the plate-like structure on the heat treatment object 3 is not limited to the middle position, but a plurality of first gas flow-limiting members 9 disposed on the different vehicles 2 are required to be disposed on the same plane, and the plurality of first gas flow-limiting members 9 can be spliced to form an integral flow-limiting plane.

In other embodiments, the first gas flow-limiting member 9 may be configured as a cover, where the first gas flow-limiting member 9 is configured to cover the heat treatment object 3, the first gas flow-limiting member 9 is configured to extend toward two side walls of the kiln 1, and the first gas flow-limiting member 9 is configured to be close to two side walls of the kiln 1, and when the first gas flow-limiting member is not in contact with the side walls of the kiln 1, the entire cross section of the space can be filled and blocked, so that the air flow can only flow through the gaps of the heat treatment object 3.

Specifically, the first gas flow limiting member 9 is mounted on the carrier 2, when the carrier 2 moves, if the position of the first gas flow limiting member 9 is not fixed, the first gas flow limiting member 9 is easy to fall down or slide relatively due to inertia, so that the purpose of blocking the gas flow channel cannot be achieved, therefore, in the embodiment, in order to achieve connection between the first gas flow limiting member 9 and the carrier 2, a containing groove 10 is formed in the carrier 2, and the connection end of the first gas flow limiting member 9 and the carrier 2 is inserted into the containing groove 10, and the first gas flow limiting member 9 is limited and fixed through the containing groove 10, as shown in fig. 4.

In other embodiments, a hollow upright post may be disposed on the kiln car, and the inner dimension of the hollow upright post is matched with the dimension of the leg of the first gas flow-limiting component 9, so that the leg of the first gas flow-limiting component 9 can be smoothly inserted into the hollow upright post, and the first gas flow-limiting component 9 is supported and fixed by the upright post.

Example 2

Referring to fig. 1, in some kilns 1, a support structure 11 is used to jack up the heat treatment object 3 from the kiln car, so that a large gap exists between the bottom of the heat treatment object 3 and the upper surface of the kiln car to form a third air flow channel 8; the air flow entering the furnace chamber of the kiln 1 from the air inlet device 4 can also flow into the air exhaust device 5 through the third air flow channel 8, and can not play a role in heating or cooling the heat treatment object 3 or conveying the reaction gas to the reaction interface;

in this case, as shown with reference to fig. 3, a second gas flow restriction member 12 is further provided between the adjacent two support structures 11, and the second gas flow restriction member 12 cuts off the third gas flow passage 8 formed by the support structures 11 provided in the gap at the bottom of the heat treatment object 3.

Specifically, according to the actual requirement, the first gas flow-limiting component 9 and the second gas flow-limiting component 12 may be independent from each other, that is: only the first gas flow restriction 9 or the second gas flow restriction 12 is installed, or all.

Specifically, in the actual installation process, the first gas flow restriction member 9 may be erected on the carrier 2 using a robot after the heat treatment object 3 is placed on the carrier 2; and the second gas flow restriction member 12 may be placed on the carrier 2 before the heat treatment object 3 is placed. In use of the vehicle 2, the second gas flow restrictor 12 does not need to be repeatedly attached and detached.

Specifically, the materials of the first gas flow-limiting component 9 and the second gas flow-limiting component 12 should be selected from suitable high-temperature resistant materials, such as ceramic materials, graphite materials (applicable in inert atmosphere) and the like, according to the highest working temperature and working atmosphere of the kiln 1;

the preferred material in this embodiment is ceramic fiber board, has advantages such as light in weight, heat capacity is little, easy processing and installation, and ceramic fiber board different models have different operating temperature, need select according to kiln 1's the highest operating temperature.

Example 3

Referring to fig. 2, in some kilns 1, in order to prevent the air flow between different temperature areas in the furnace chamber from moving back and forth or to quickly transfer the temperature, a partition 13 is further provided at the top of the kiln 1, and in order not to affect the movement of the first gas flow-limiting member 9, an opening 14 through which the first gas flow-limiting member 9 passes is provided on the partition 13, and the first gas flow-limiting member 9 passes through the opening 14.

Specifically, the technical scheme described in the above embodiment 1/2/3 can be applied not only to a continuous kiln in which the air inlet device 4 and the air outlet device 5 are disposed in opposition to each other, but also to an intermittent kiln such as a box-type furnace or a shuttle kiln;

in the intermittent kiln, the air inlet means 4 and the air outlet means 5 are also disposed in an opposed manner on two opposite furnace walls, so that an air flow transversely across the furnace chamber and the heat treatment object 3 can be formed. By the same token, the gas flow restriction device according to the utility model may be arranged to restrict the gas flow in a batch kiln, the first gas flow restriction member 9 being arranged to prevent the gas flow from passing through the passage between the object 3 to be heat treated and the wall and roof of the furnace, and the second gas flow restriction member 12 being arranged to prevent the gas flow from passing through the gap between the bottom of the object 3 to be heat treated and the upper surface of the carrier 2.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A gas flow restrictor for use in a kiln comprising:

the first gas flow limiting component is arranged on a carrier in the kiln, the first gas flow limiting component is provided with a through hole for avoiding a heat treatment object on the carrier, and the first gas flow limiting component is erected outside the heat treatment object, wherein:

the inner contour of the first gas flow-limiting component is in profiling fit with the heat treatment object, the outer contour of the first gas flow-limiting component is close to the furnace top of the kiln, a narrow gap is reserved between the first gas flow-limiting component and the furnace top, the first gas flow-limiting component is arranged along the longitudinal extension direction of the kiln, and a flow-limiting plane for limiting gas flow is formed on the transverse extension direction of the kiln by the first gas flow-limiting component.

2. The gas flow-limiting device for use in a kiln according to claim 1, wherein: the carrier is provided with a containing groove, and the connecting end of the first gas flow limiting component and the carrier is inserted into the containing groove.

3. The gas flow-limiting device for use in a kiln according to claim 1, wherein: a plurality of vehicles connected end to end are arranged in the kiln, and two first gas flow-limiting components on two adjacent vehicles are closely attached.

4. A gas flow restrictor for use in a kiln according to claim 3, wherein: and a limiting structure is arranged at the position where the two first gas flow limiting components are tightly attached, and the two first gas flow limiting components are in limiting connection through the limiting structure.

5. A gas flow restrictor for use in a kiln according to claim 3, wherein: the first gas flow-limiting components are of plate-shaped structures, the plurality of first gas flow-limiting components are arranged on the same plane, and the plurality of first gas flow-limiting components are spliced to form a flow-limiting plane.

6. The gas flow-limiting device for use in a kiln according to claim 1, wherein: the first gas flow-limiting component is of a cover structure and extends towards two side walls of the kiln.

7. The gas flow-limiting device for use in a kiln according to claim 1, wherein: the top of the kiln is provided with a partition, and an opening for the first gas flow limiting component to pass through is formed in the partition.

8. The gas flow-limiting device for use in a kiln according to claim 1, wherein: a plurality of spaced supporting structures are arranged on the carrier, the plurality of supporting structures jack up the heat treatment object, and a second gas flow limiting component is arranged between two adjacent supporting structures.

9. The gas flow restrictor device for use in a kiln of claim 8, wherein: the first gas flow-limiting component and the second gas flow-limiting component are both made of high-temperature resistant materials, and the method comprises the following steps: ceramic materials or graphite materials.

10. The gas flow-limiting device for use in a kiln according to claim 1, wherein: the kiln is a continuous kiln or an intermittent kiln.