Oxygen roller kiln

Abstract

The oxygen roller kiln comprises a kiln body and a gas circulation mechanism, and the kiln body is at least provided with the gas circulation mechanism in a constant-temperature area. The gas circulation mechanism is used for guiding high-temperature gas of the high-temperature layer of the kiln body to the low-temperature layer of the kiln body, the high-temperature gas in the kiln body is promoted to circulate through the gas circulation mechanism, the temperature difference between the high-temperature layer and the low-temperature layer of the constant-temperature area of the kiln body is reduced, and the temperature in the constant-temperature area of the kiln body is evenly distributed. The difference of physical and chemical properties of the product caused by the temperature difference between the high-temperature layer and the low-temperature layer is reduced, and the uniformity of the physical and chemical properties of the product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oxygen roller kilns, and in particular to an oxygen roller kiln. Background Art

[0002] The ternary positive electrode material is calcined in an oxygen roller kiln, and the performance of the ternary positive electrode material is affected by the calcination temperature.

[0003] During the production process, there is a temperature difference between the upper and lower layers of the constant temperature zone of the oxygen roller kiln. This temperature difference will lead to differences in the electro-physical and chemical properties of the ternary positive electrode materials in the saggers located in the upper layer and the saggers located in the lower layer, that is, the uniformity of the physicochemical properties of the products in the same oxygen roller kiln.

[0004] Therefore, how to improve the uniformity of the physical and chemical properties of products in the oxygen roller kiln has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The present application proposes an oxygen roller kiln to improve the uniformity of the physical and chemical properties of products in the oxygen roller kiln.

[0006] In order to achieve the above-mentioned object, the present application provides an oxygen roller kiln, comprising a kiln body and a gas circulation mechanism, wherein the gas circulation mechanism is arranged at least in the constant temperature zone of the kiln body.

[0007] The gas circulation mechanism is used to circulate gas between the high temperature layer and the low temperature layer of the kiln body, and the gas circulation mechanism includes:

[0008] An outlet pipe is connected to the high temperature layer of the kiln body;

[0009] An inlet pipe is connected to the low temperature layer of the kiln body;

[0010] A connecting pipe connecting the outlet pipe and the inlet pipe;

[0011] A fan is arranged on at least one of the connecting pipe and the introduction pipe, and is used to provide power for the flow of gas so as to guide the gas from the high temperature layer of the kiln body to the low temperature layer of the kiln body.

[0012] Preferably, in the above oxygen roller kiln, the outlet pipe comprises a first main pipe and a plurality of first branch pipes arranged side by side along the plane where the high-temperature layer is located.

[0013] The first end of the first branch pipe is in communication with the high temperature layer, the second end of the first branch pipe is in communication with the first main pipe, and the first main pipe is in communication with the connecting pipe.

[0014] Preferably, in the above oxygen roller kiln, the inlet pipe includes a second main pipe and a plurality of second branch pipes arranged side by side along the plane where the low-temperature layer is located.

[0015] One end of the second branch pipe is communicated with the inner cavity of the kiln body, the other end of the second branch pipe is communicated with the second main pipe, and the second main pipe is communicated with the connecting pipe.

[0016] Preferably, in the above oxygen roller kiln, the arrangement density of the second branch pipes is greater than or equal to the arrangement density of the first branch pipes.

[0017] Preferably, in the above oxygen roller kiln, a plurality of gas outlet holes facing the high-temperature layer are opened on the second branch pipe along the length direction of the second branch pipe.

[0018] Preferably, in the above oxygen roller kiln, a dryer is provided on the connecting pipe, and the dryer is used to absorb water and carbon dioxide in the gas of the high temperature layer; and / or,

[0019] The dryer is located upstream of the fan.

[0020] Preferably, in the above oxygen roller kiln, the introduction pipe is located below the heater of the kiln body.

[0021] Preferably, in the above oxygen roller kiln, the gas circulation mechanism is arranged on at least one side in the length direction of the kiln body.

[0022] Preferably, in the above oxygen roller kiln, the gas circulation mechanism is arranged outside the kiln body.

[0023] Preferably, in the above oxygen roller kiln, a heat-insulating layer is provided on the inlet pipe, the outlet pipe and / or the connecting pipe.

[0024] The oxygen roller kiln provided in the embodiment of the present application includes a kiln body and a gas circulation mechanism, and the kiln body is provided with a gas circulation mechanism at least in the constant temperature zone. The function of the gas circulation mechanism is to lead the high temperature gas of the high temperature layer of the kiln body to the low temperature layer of the kiln body, and to promote the circulation of the high temperature gas in the kiln body through the gas circulation structure, thereby reducing the temperature difference between the high temperature layer and the low temperature layer in the constant temperature zone of the kiln body, making the temperature in the constant temperature zone of the kiln body uniformly distributed, reducing the difference in the physical and chemical properties of the product caused by the temperature difference between the high temperature layer and the low temperature layer, and improving the uniformity of the physical and chemical properties of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0026] Figure 1 It is a structural schematic diagram of the oxygen roller kiln of the present application.

[0027] The accompanying drawings are as follows:

[0028] 1-kiln body; 2-outlet pipe; 21-first main pipe; 22-first branch pipe; 3-inlet pipe; 31-second main pipe; 32-second branch pipe; 4-connecting pipe; 5-fan; 6-dryer. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0030] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0031] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0032] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0034] See also Figure 1 .

[0035] Some embodiments of the present application disclose an oxygen roller kiln, comprising a kiln body 1 and a gas circulation mechanism, wherein the kiln body 1 is provided with the gas circulation mechanism at least in a constant temperature zone.

[0036] The gas circulation mechanism can be arranged in the area of ​​the kiln body 1 where temperature balance is required, not limited to the constant temperature area.

[0037] The kiln body 1 has a high temperature layer and a low temperature layer, wherein the high temperature layer is the area with higher gas temperature in the kiln body 1, and the low temperature layer is the area with lower gas temperature in the kiln body 1. Figure 1 Taking the figure as an example for explanation, along the height direction of the kiln body 1, the temperature inside the kiln body 1 gradually increases from the lower end of the kiln body 1 to the upper end of the kiln body 1, the high temperature layer is located at the upper part of the kiln body 1, and the low temperature layer is located at the lower part of the kiln body 1.

[0038] The function of the gas circulation mechanism is to lead the high-temperature gas of the high-temperature layer of the kiln body 1 to the low-temperature layer of the kiln body 1, and to promote the circulation of the high-temperature gas in the kiln body 1 through the gas circulation structure, thereby reducing the temperature difference between the high-temperature layer and the low-temperature layer in the constant temperature zone of the kiln body 1, making the temperature in the constant temperature zone of the kiln body 1 uniformly distributed, reducing the difference in the physical and chemical properties of the product caused by the temperature difference between the high-temperature layer and the low-temperature layer, and improving the uniformity of the physical and chemical properties of the product.

[0039] In some embodiments of the present application, the gas circulation mechanism includes an outlet pipe 2, an inlet pipe 3, a connecting pipe 4 and a fan 5, wherein the outlet pipe 2 is connected to the high-temperature layer of the kiln body 1, the inlet pipe 3 is connected to the low-temperature layer of the kiln body 1, the connecting pipe 4 is used to connect the outlet pipe 2 and the inlet pipe 3, and the fan 5 is connected to at least one of the inlet pipe 3 or the connecting pipe 4.

[0040] Preferably, the fan 5 is disposed below the connecting pipe 4 and close to the ground, and the fan 5 can be located on the ground.

[0041] During operation, the fan 5 is turned on to provide power for the movement of the high-temperature gas in the high-temperature layer. The high-temperature gas in the high-temperature layer enters the low-temperature layer through the outlet pipe 2, the connecting pipe 4 and the inlet pipe 3 in turn, accelerating the output of the high-temperature gas from the high-temperature layer to the low-temperature layer in the kiln body 1, so that the temperature distribution in the kiln body 1 is uniform.

[0042] This solution introduces the high temperature gas of the high temperature layer to the low temperature layer through a gas circulation mechanism, that is, the high temperature gas of the high temperature layer of the kiln body 1 is used to heat the low temperature layer of the kiln body 1, without the need for an additional heat source, thereby achieving the effect of reducing costs and increasing efficiency.

[0043] Preferably, the outlet pipe 2 is arranged in the area with the highest temperature of the kiln body 1, and the inlet pipe 3 is arranged in the area with the lowest temperature of the kiln body 1, so as to adjust the temperature in the kiln body 1 to the greatest extent.

[0044] The gas circulation mechanism can be set only in the highest temperature area and the lowest temperature area of ​​the kiln body 1, or the gas circulation mechanism can be set in both the higher temperature area and the lower temperature area of ​​the kiln body 1. That is to say, the number of gas circulation mechanisms in the constant temperature zone is not limited to one group, and can be multiple groups.

[0045] In some embodiments of the present application, the outlet pipe 2 is arranged at the top of the kiln body 1 , and the inlet pipe 3 is arranged at the bottom of the kiln body 1 .

[0046] Preferably, the outlet of the introduction pipe 3 is arranged below the heater of the kiln body 1 .

[0047] The inlet pipe 3 is arranged below the heater. The high-temperature gas introduced by the inlet pipe 3 cooperates with the heating rod to heat the gas above the heater, thereby reducing the energy consumption of the heating rod, extending the service life of the heating rod to a certain extent, and saving costs. At the same time, it will not affect the transportation of the sagger in the kiln body and will not affect production.

[0048] like Figure 1 As shown, the lead-out pipe 2 includes a first main pipe 21 and a plurality of first branch pipes 22 arranged side by side along the plane where the high-temperature layer is located. The plurality of first branch pipes 22 can lead out high-temperature gas from multiple positions of the high-temperature layer. The high-temperature gas led out through the plurality of first branch pipes 22 enters the first main pipe 21, and the first main pipe 21 is connected to the connecting pipe 4.

[0049] The distance between two adjacent first branch pipes 22 is 0.5m-2.0m. Along the plane where the high temperature layer is located, multiple first branch pipes 22 are arranged at equal or unequal intervals. The first branch pipes 22 can be arranged on the side wall of the kiln body 1 or on the top wall of the kiln body 1.

[0050] In the embodiment where the first branch pipe 22 is disposed on the side wall of the kiln body 1 , the first branch pipe 22 is a straight pipe, one end of the first branch pipe 22 is connected to the kiln body 1 , and the other end of the first branch pipe 22 is connected to the first main pipe 21 .

[0051] In the embodiment where the first branch pipe 22 is arranged on the top wall of the kiln body 1, the first branch pipe 22 is an L-shaped pipe, including a vertical pipe and an inclined pipe, the vertical pipe is arranged in the middle of the top wall of the kiln body 1, the lower end of the vertical pipe is connected to the kiln body 1, the upper end of the vertical pipe is connected to the first end of the inclined pipe, and the second end of the inclined pipe is connected to the first main pipe 21. In this embodiment, the inclined pipe can be a straight pipe or a curved pipe. In the embodiment where the inclined pipe is a curved pipe, the inclined pipe fits the outer wall of the kiln body 1 to reduce the space occupied by the lead-out pipe 2.

[0052] like Figure 1 As shown, the introduction pipe 3 includes a second main pipe 31 and a plurality of second branch pipes 32 arranged side by side along the plane where the low temperature layer is located. The second main pipe 31 is connected to the connecting pipe 4, and the high temperature gas entering the first main pipe 21 enters the second main pipe 31 through the connecting pipe 4, and then enters the plurality of second branch pipes 32 through the second main pipe 31, and the high temperature gas is introduced into the low temperature layer of the kiln body 1 through the plurality of second branch pipes 32.

[0053] Preferably, the second branch pipe 32 is disposed below the heater of the kiln body.

[0054] The distance between two adjacent second branch pipes 32 is 0.5m-2.0m. Along the plane where the low temperature layer is located, the plurality of second branch pipes 32 are arranged at equal or unequal intervals.

[0055] The lengths of the plurality of second branch pipes 32 may be equal or unequal. In the embodiment where the lengths of the plurality of second branch pipes 32 are unequal, the gas outlet ends of the second branch pipes 32 correspond to different positions of the plane where the low temperature layer is located, so as to transport the high temperature gas to different positions of the plane where the low temperature layer is located, which has a better effect on improving the uniform distribution of temperature in the kiln body 1.

[0056] In order to further optimize the above technical solution, the present application sets a plurality of air outlets in the length direction of the second branch pipe 32, and the air outlets are opened on the side of the second branch pipe 32 facing the high-temperature layer, so that the multiple air outlets can discharge high-temperature gas to the low-temperature layer at the same time, thereby increasing the effective area of ​​the high-temperature gas.

[0057] The gas circulation mechanism can not only lead the high temperature gas from the high temperature layer of the kiln body 1 to the low temperature layer, but also lead the oxygen from the high temperature layer to the low temperature layer, so as to adjust the oxygen concentration in the kiln body 1 and reduce the influence of uneven oxygen distribution on the physical and chemical properties of the product.

[0058] In some embodiments of the present application, the arrangement density of the second branch pipes 32 is greater than the arrangement density of the first branch pipes 22, that is, the distance between two adjacent second branch pipes 32 is less than the distance between two adjacent first branch pipes 22, and the number of second branch pipes 32 is greater than the number of first branch pipes 22, so that the high-temperature gas discharged from the second branch pipes 32 can more comprehensively cover the plane where the low-temperature layer is located, thereby optimizing the circulation effect of the gas in the kiln body 1.

[0059] The frequency of the fan 5 is adjusted to adjust the pressure of the gas circulation mechanism, thereby controlling the amount of inlet and outlet gas in the high-temperature layer and the low-temperature layer of the kiln body 1 .

[0060] The gas in the high temperature layer contains moisture and carbon dioxide. In order to reduce the harm caused by the circulation of moisture and carbon dioxide in the kiln body 1, the present application provides a dryer 6 on the connecting pipe 4, and the dryer 6 is used to absorb moisture and carbon dioxide in the gas.

[0061] Two or more connecting pipes 4 are arranged side by side along the length direction of the first main pipe 21 to increase the connecting area between the outlet pipe 2 and the inlet pipe 3. Preferably, each connecting pipe 4 is provided with a fan 5 and a dryer 6.

[0062] Figure 1 The figure shows an embodiment of an oxygen roller kiln having two connecting pipes 4, which are arranged in the middle of the length direction of the first main pipe 21, and a fan 5 and a dryer 6 are arranged on the connecting pipe 4. In this solution, the dryer 6 is arranged at one end of the connecting pipe 4 close to the first main pipe 21, and the gas entering the connecting pipe 4 first passes through the dryer 6 and then passes through the fan 5. This design can reduce the moisture entering the fan 5, reduce the corrosion of the moisture to the fan 5, and extend the service life of the fan 5.

[0063] In order to further optimize the above technical solution, valves are provided upstream and / or downstream of the dryer 6 to control the on and off of the gas.

[0064] In some embodiments of the present application, the gas circulation mechanism may only include an outlet pipe 2 and an inlet pipe 3, and the number of the outlet pipes 2 and the inlet pipes 3 are both multiple, and the multiple outlet pipes 2 are arranged along the side wall of the kiln body 1, and the multiple inlet pipes 3 are also arranged along the side wall of the kiln body 1. A fan 5 is arranged on the outlet pipe 2 or the inlet pipe 3, and the outlet pipe 2 is directly connected to the inlet pipe 3. Under the action of the fan 5, the high-temperature layer gas of the kiln body 1 is led to the low-temperature layer of the kiln body 1.

[0065] The gas circulation mechanism is arranged on one side of the length direction of the kiln body 1. Figure 1 As shown, the length direction of the kiln body 1 is consistent with the conveying direction of the saggers in the kiln body 1 on the roller table, and the two ends of the length direction of the kiln body 1 are respectively an entrance for the saggers to enter and an exit for the saggers to exit.

[0066] The gas circulation mechanism is not limited to being arranged on only one side of the kiln body 1 in the longitudinal direction, but may also be arranged on both sides of the kiln body 1 in the longitudinal direction.

[0067] In the embodiment where the gas circulation mechanisms are arranged on both sides of the kiln body 1 in the longitudinal direction and the air duct is connected to the top wall of the kiln body 1 , the first branches 22 of the air ducts of the two gas circulation mechanisms are staggered in the longitudinal direction of the kiln body 1 .

[0068] The gas circulation mechanism may be arranged inside the kiln body 1 or outside the kiln body 1 .

[0069] Preferably, the gas circulation mechanism is arranged outside the kiln body 1, so that the gas circulation mechanism does not occupy the space in the kiln body 1, thereby not affecting the output of the oxygen roller kiln.

[0070] The gas circulation mechanism is arranged outside the kiln body 1, which can also facilitate the maintenance of the gas circulation mechanism, and the oxygen roller kiln does not need to be shut down.

[0071] In order to reduce the influence of the external environment on the gas temperature, in this solution, a heat-insulating layer is provided on the inlet pipe 3, the outlet pipe 2 and / or the connecting pipe 4 to reduce the heat loss of the gas during the transportation process.

[0072] The high temperature layer and the low temperature layer of the constant temperature zone of the oxygen roller kiln disclosed in the present application are provided with temperature measuring devices for measuring the temperature. When the temperature difference between the high temperature layer and the low temperature layer is greater than or equal to 3°C, the gas circulation mechanism is started. Specifically, the valves on both sides of the dryer are opened, and the motor drives the fan 5 to rotate, generating negative pressure in the outlet pipe 2. The gas in the high temperature layer of the kiln body 1 passes through the outlet pipe 2 in sequence through the connecting pipe 4, the dryer 6, the fan 5 and the introduction pipe 3. The introduction pipe 3 introduces the high temperature gas into the low temperature layer of the kiln body 1, completing the closed loop and realizing the recycling of heat and oxygen.

[0073] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. An oxygen roller kiln, characterized in that: The kiln comprises a kiln body (1) and a gas circulation mechanism, wherein the kiln body (1) is provided with the gas circulation mechanism at least in a constant temperature zone. The gas circulation mechanism is used to circulate gas between the high temperature layer and the low temperature layer of the kiln body (1), and the gas circulation mechanism comprises: An outlet pipe (2) is connected to the high-temperature layer of the kiln body (1); An inlet pipe (3) connected to the low-temperature layer of the kiln body (1); A connecting pipe (4) connecting the outlet pipe (2) and the inlet pipe (3); A fan (5) is arranged on at least one of the connecting pipe (4) and the introduction pipe (3) and is used to provide power for the flow of gas so as to guide the gas from the high-temperature layer of the kiln body (1) to the low-temperature layer of the kiln body (1).

2. The oxygen roller kiln according to claim 1, characterized in that: The outlet pipe (2) comprises a first main pipe (21) and a plurality of first branch pipes (22) arranged side by side along the plane where the high-temperature layer is located. The first end of the first branch pipe (22) is in communication with the high-temperature layer, the second end of the first branch pipe (22) is in communication with the first main pipe (21), and the first main pipe (21) is in communication with the connecting pipe (4).

3. The oxygen roller kiln according to claim 2, characterized in that: The inlet pipe (3) comprises a second main pipe (31) and a plurality of second branch pipes (32) arranged side by side along the plane where the low-temperature layer is located. One end of the second branch pipe (32) is in communication with the inner cavity of the kiln body (1), the other end of the second branch pipe (32) is in communication with the second main pipe (31), and the second main pipe (31) is in communication with the connecting pipe (4).

4. The oxygen roller kiln according to claim 3, characterized in that: The arrangement density of the second branch pipes (32) is greater than or equal to the arrangement density of the first branch pipes (22).

5. The oxygen roller kiln according to claim 3, characterized in that: A plurality of air outlet holes facing the high-temperature layer are provided on the second branch pipe (32) along the length direction of the second branch pipe (32).

6. The oxygen roller kiln according to claim 1, characterized in that: The connecting pipe (4) is provided with a dryer (6), and the dryer (6) is used to absorb water and carbon dioxide in the gas in the high-temperature layer; and / or, The dryer (6) is located upstream of the fan (5).

7. The oxygen roller kiln according to claim 1, characterized in that: The outlet of the introduction pipe (3) is located below the heater of the kiln body (1).

8. The oxygen roller kiln according to claim 1, characterized in that: The gas circulation mechanism is arranged on at least one side in the length direction of the kiln body (1).

9. The oxygen roller kiln according to claim 1, characterized in that: The gas circulation mechanism is arranged outside the kiln body (1).

10. The oxygen roller kiln according to claim 1, characterized in that: A heat-insulating layer is provided on the inlet pipe (3), the outlet pipe (2) and / or the connecting pipe (4).

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