Kiln

Abstract

The utility model discloses a kiln which comprises a kiln body, an atmosphere monitoring device and an atmosphere adjusting device, the atmosphere monitoring device is used for monitoring the concentration of CO2 in the kiln body, and the atmosphere monitoring device comprises a CO2 concentration sensor arranged in the kiln body. The atmosphere adjusting device comprises an air inlet assembly and an air outlet assembly, the air inlet assembly is used for adjusting the air inlet amount of the furnace body, and the air outlet assembly is used for adjusting the air outlet amount of the furnace body. According to the kiln provided by the invention, the CO2 concentration in the kiln body is monitored through the atmosphere monitoring device, and the air inlet amount of the air inlet assembly and the air outlet amount of the air outlet assembly can be adjusted according to the CO2 concentration value, so that the CO2 concentration value in the kiln body is adjusted. By adjusting the concentration value of CO2 in the furnace body, the concentration value of CO2 in the furnace body can be maintained in a required range as much as possible, and then the sintering quality of the furnace is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln atmosphere control, in particular to a kiln. Background Art

[0002] Kilns are commonly used for product sintering. For example, in the production of lithium cobalt oxide battery cathode materials, the sintering process is a key step in the production process and directly determines the performance of the lithium cobalt oxide cathode material. Therefore, the control of the sintering process is crucial. During the sintering process, the performance of the lithium cobalt oxide cathode material is greatly affected by the gas atmosphere in the kiln. The gas concentration in the kiln determines the performance of the product.

[0003] Specifically, during the high-temperature sintering process, the main gases in the kiln are Li vapor, O2, and CO2. According to the reaction formula for lithium cobalt oxide synthesis:

[0004] 4Co3O4+6Li2CO3+O2→12LiCoO2+6CO2;

[0005] The relative concentrations of Li vapor, O2, and CO2 within the kiln directly determine the overall production efficiency and performance of lithium cobalt oxide. However, if the reaction product, CO2, fails to be discharged from the kiln in a timely manner and continues to accumulate within the kiln, the synthesis of lithium cobalt oxide will be inhibited, and unreacted cobalt tetroxide impurities may be present in the final product. The presence of cobalt tetroxide impurities will further affect the electrochemical performance of lithium cobalt oxide, resulting in reduced kiln sintering quality.

[0006] Therefore, how to improve the sintering quality of the kiln is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0007] The purpose of the utility model is to provide a kiln which can improve its own sintering quality.

[0008] The kiln provided in this application includes:

[0009] furnace body;

[0010] An atmosphere monitoring device, the atmosphere monitoring device is used to monitor the CO2 concentration in the furnace body, the atmosphere monitoring device includes a CO2 concentration sensor provided in the furnace body;

[0011] The atmosphere regulating device includes an air inlet component and an air outlet component. The air inlet component is used to regulate the air inlet volume to the furnace body, and the air outlet component is used to regulate the air outlet volume of the furnace body.

[0012] Optionally, in the above-mentioned kiln, the atmosphere monitoring device further includes a CO2 concentration display, and the CO2 concentration display is connected to the CO2 concentration sensor signal to display the CO2 concentration value monitored by the CO2 concentration sensor.

[0013] Optionally, in the above kiln, the air inlet assembly includes:

[0014] a blower, the blower being installed outside the furnace body;

[0015] An air intake duct is installed inside the furnace body. The air intake duct is provided with one or at least two kiln air inlets along the gas flow direction in the furnace body. The blower is used to supply air to the air intake duct.

[0016] Optionally, in the above kiln, the air outlet assembly includes:

[0017] an exhaust fan installed outside the furnace body;

[0018] An exhaust duct is installed inside the furnace body. The exhaust duct is provided with one or at least two kiln exhaust ports along the gas flow direction in the furnace body. The exhaust fan is used to extract the gas in the exhaust duct.

[0019] Optionally, in the above kiln, the number of the kiln air inlets and the kiln exhaust ports is the same, and they correspond one to one along the gas flow direction in the furnace body.

[0020] Optionally, in the above-mentioned kiln, a plurality of temperature control zones are provided in the furnace body along the gas flow direction, all the temperature control zones are divided into a plurality of temperature unit groups along the gas flow direction, and each of the temperature unit groups is provided with a CO2 concentration sensor.

[0021] Optionally, the above-mentioned kiln further includes a valve body controller, the kiln air inlet in each of the temperature unit groups is provided with an air inlet valve, the kiln exhaust port in each of the temperature unit groups is provided with an exhaust valve, the CO2 concentration sensor is connected to the valve body controller signal, and the valve body controller controls the opening of the air inlet valve and the exhaust valve.

[0022] Optionally, in the above-mentioned kiln, the atmosphere monitoring device also includes a CO2 concentration display, which is connected to the CO2 concentration sensor signal to display the CO2 concentration value monitored by the CO2 concentration sensor, and the CO2 concentration display, the air intake valve, the exhaust valve and the CO2 concentration sensor are all connected to the valve body controller signal.

[0023] Optionally, the above-mentioned kiln further includes a control device and an alarm device, and the CO2 concentration sensor and the alarm device are both connected to the control device; when the CO2 concentration value received from the CO2 concentration sensor exceeds a preset range, the control device controls the alarm device to alarm.

[0024] Optionally, in the above-mentioned kiln, the kiln is a sintering device for lithium cobalt oxide battery positive electrode materials.

[0025] In the above technical solution, the kiln provided by the present invention includes a furnace body, an atmosphere monitoring device, and an atmosphere regulating device. The atmosphere monitoring device is used to monitor the CO2 concentration in the furnace body, and the atmosphere monitoring device includes a CO2 concentration sensor disposed within the furnace body. The atmosphere regulating device includes an air inlet assembly and an air outlet assembly. The air inlet assembly is used to adjust the air volume entering the furnace body, and the air outlet assembly is used to adjust the air volume exiting the furnace body. During use of the furnace body, the atmosphere monitoring device adjusts the atmosphere regulating device based on the CO2 concentration value measured by the CO2 concentration sensor. Specifically, it adjusts the air volume entering the furnace body and the air volume exiting the furnace body, thereby maintaining the CO2 concentration in the furnace body within a preset reasonable range as much as possible.

[0026] As can be seen from the above description, in the kiln provided by this application, the CO2 concentration within the furnace body is monitored by an atmosphere monitoring device, and the air intake of the air intake assembly and the air output of the air outlet assembly can be adjusted according to the CO2 concentration value, thereby adjusting the CO2 concentration value within the furnace body. By adjusting the CO2 concentration value within the furnace body, the CO2 concentration value within the furnace body can be maintained within the desired range as much as possible, thereby improving the sintering quality of the kiln itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 This is a schematic structural diagram of a kiln provided in an embodiment of the present utility model.

[0029] in Figure 1 Middle: 1-blower, 2-exhaust duct, 3-CO2 concentration display, 4-furnace body, 5-exhaust fan, 6-air intake duct, 7-roller kiln automatic line, 8-CO2 concentration sensor, 9-data analysis processor, 10-central control cabinet, 11-signal transmission optical fiber. DETAILED DESCRIPTION

[0030] The core of the utility model is to provide a kiln which can improve its own sintering quality.

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and implementation methods.

[0032] Please refer to Figure 1 .

[0033] In one specific embodiment, the kiln provided by the present invention includes a furnace body 4, an atmosphere monitoring device, and an atmosphere conditioning device. The atmosphere monitoring device is used to monitor the CO2 concentration within the furnace body 4 and includes a CO2 concentration sensor 8 disposed within the furnace body 4. The atmosphere conditioning device includes an air inlet assembly and an air outlet assembly. The air inlet assembly is used to adjust the air flow into the furnace body 4, and the air outlet assembly is used to adjust the air flow out of the furnace body 4. Specifically, the air inlet assembly and the air outlet assembly can each be a fan disposed at opposite ends of the furnace body 4.

[0034] In order to extend the service life of the CO2 concentration sensor 8, preferably, the CO2 concentration sensor 8 can be made of high-temperature resistant material.

[0035] Specifically, the CO2 concentration sensor 8 is installed on the side wall of the kiln, and the measuring end of the CO2 concentration sensor 8 is located inside the furnace body 4. Specifically, the CO2 concentration sensor 8 is located at a preset height position above the height of the sagger in the furnace body 4. For example, the CO2 concentration sensor 8 is located 10 cm above the height of the sagger in the furnace body 4. The installation height needs to be higher than the normal height of the sagger when it is moving to avoid damage to the CO2 concentration sensor 8 by collision with the sagger. The sagger is driven to move by the roller kiln automatic line 7. Specifically, the probe of the CO2 concentration sensor 8 is located inside the furnace body 4, which can monitor the CO2 concentration in real time, and then reflect the actual reaction situation in the kiln from the side through the CO2 concentration value.

[0036] In one embodiment, the atmosphere monitoring device further includes a CO2 concentration display 3, which is signal-connected to the CO2 concentration sensor 8 to display the CO2 concentration value monitored by the CO2 concentration sensor 8. Specifically, the CO2 concentration display 3 is located outside the furnace body 4. The provision of the CO2 concentration display 3 allows the user to directly obtain the CO2 concentration value and, therefore, to promptly adjust the air intake and air output of the furnace body 4 based on the CO2 concentration value.

[0037] In order to facilitate reading of the CO2 concentration value, preferably, the CO2 concentration display 3 is a digital display that directly displays the CO2 concentration value in digits.

[0038] Specifically, the kiln provided in this application is a sintering device for positive electrode materials of lithium cobalt oxide batteries.

[0039] During use of the furnace body 4, the atmosphere monitoring device adjusts the atmosphere control device based on the CO2 concentration value measured by the CO2 concentration sensor 8. Specifically, the air inlet and outlet volumes of the furnace body 4 are adjusted to maintain the CO2 concentration in the furnace body 4 within a predetermined reasonable range. Specifically, the CO2 concentration can be maintained within a predetermined range while maintaining the furnace pressure within the furnace body 4 unchanged.

[0040] As can be seen from the above description, in the kiln provided in the specific embodiment of the present application, the CO2 concentration in the furnace body 4 is monitored by the atmosphere monitoring device, and the air inlet volume of the air inlet assembly and the air outlet volume of the air outlet assembly can be adjusted according to the CO2 concentration value, thereby adjusting the CO2 concentration value in the furnace body 4. By adjusting the CO2 concentration value in the furnace body 4, the CO2 concentration value in the furnace body 4 can be maintained within the desired range as much as possible, thereby improving its own sintering quality.

[0041] In one embodiment, the air intake assembly includes a blower 1 and an air intake duct 6. The blower 1 is installed outside the furnace body 4. The air intake duct 6 is installed inside the furnace body 4. The air intake duct 6 is provided with one or at least two kiln air inlets along the direction of gas flow in the furnace body 4. The blower 1 is used to supply air to the air intake duct 6.

[0042] In one embodiment, the air outlet assembly includes an exhaust fan 5 and an exhaust duct 2. The exhaust fan 5 is mounted outside the furnace body 4. The exhaust duct 2 is mounted inside the furnace body 4 and has one or at least two kiln exhaust ports along the direction of gas flow within the furnace body 4. The exhaust fan 5 is used to extract gas from the exhaust duct 2. Specifically, the air inlet duct 6 is located at the bottom of the furnace body 4, and the exhaust duct 2 is located at the top of the furnace body 4. The blower 1 is connected to the air inlet duct 6 to supply air into the furnace body 4 to ensure the reaction of the lithium cobalt oxide. The exhaust fan 5 is connected to the exhaust duct 2 to exhaust the reaction waste gas within the kiln.

[0043] Since the air flowing through the exhaust fan 5 is at a relatively high temperature, the exhaust fan 5 is preferably a high temperature resistant fan.

[0044] Specifically, the number of kiln air inlets and kiln exhaust ports is the same, and they correspond one to one along the gas flow direction in the furnace body 4. Figure 1 As shown, the kiln exhaust port at the upper portion of the furnace body 4 corresponds vertically to the kiln air inlet at the lower portion. The kiln air inlet and kiln exhaust ports are vertically staggered with the rollers of the roller kiln automatic line 7 to reduce the rollers interfering with the gas flow.

[0045] In a specific embodiment, a plurality of temperature control zones are provided along the gas flow direction in the furnace body 4. The temperature control zones are conventionally provided in a kiln and will not be described in detail herein.

[0046] Preferably, all temperature control zones are divided into multiple temperature unit groups along the gas flow direction. For example, every three or two adjacent temperature control zones serve as a temperature unit group, and each temperature unit group is provided with a CO2 concentration sensor 8. That is, a CO2 concentration sensor 8 is provided for every three or every two temperature control zones. Of course, each temperature control zone can also be provided with a CO2 concentration sensor 8. By providing multiple CO2 concentration sensors 8, the staff can promptly know the CO2 concentration in the corresponding temperature unit group, so that even if the CO2 concentration in some temperature unit groups is normal, but the CO2 concentration in some positions is abnormal, it can be monitored in time, and then the CO2 concentration in the furnace body 4 is adjusted in time, further improving the sintering quality of the kiln.

[0047] In one embodiment, the kiln further includes a valve controller. Each temperature unit group has an air inlet valve at the kiln air inlet, and an air exhaust valve at the kiln exhaust outlet. The CO2 concentration sensor 8 is signal-connected to the valve controller, which controls the opening of the air inlet and exhaust valves. Specifically, the air inlet and exhaust valves may be solenoid valves.

[0048] The atmosphere monitoring device further includes a CO2 concentration display 3, which is signal-connected to a CO2 concentration sensor 8 to display the CO2 concentration value monitored by the CO2 concentration sensor 8. The CO2 concentration display 3, the intake valve, the exhaust valve, and the CO2 concentration sensor 8 are all signal-connected to a valve controller. The valve controller obtains the CO2 concentration value from the CO2 concentration display 3 and compares the real-time CO2 concentration value with a set range. If the CO2 concentration value exceeds the set range, the valve controller controls the opening of the intake and exhaust valves, thereby adjusting the CO2 concentration at the corresponding locations.

[0049] In one embodiment, the kiln further includes a control device and an alarm device, both of which are connected to the CO2 concentration sensor 8. When the CO2 concentration value received by the CO2 concentration sensor 8 exceeds a preset range, the control device controls the alarm device to sound an alarm. Specifically, the alarm device can be configured to provide an audible or visual alarm. This alarm device serves as a reminder to the user to promptly adjust the air intake and outlet volumes, thereby adjusting the CO2 concentration.

[0050] To facilitate centralized control, the control device and valve body controller can be integrated into a central control cabinet 10. The central control cabinet 10 is equipped with a data analysis processor 9. The control center of the central control cabinet 10 is connected to the data analysis processor 9, the blower 1, and the exhaust fan 5 via a signal transmission optical fiber 11. The data analysis processor 9 is used to analyze the current CO2 concentration and compare it with the CO2 concentration within a preset range, and feed the results back to the central control cabinet 10. Specifically, when the actual CO2 concentration value exceeds the user-set limit, the data analysis processor 9 transmits an adjustment signal to the central control cabinet 10 via the signal transmission optical fiber 11. The central control cabinet 10 further transmits the adjustment signal to the blower 1 and the exhaust fan 5 via the signal transmission optical fiber 11, thereby achieving CO2 concentration control in the kiln.

[0051] Specifically, the data analysis processor 9 stores and processes the concentration information received from the CO2 concentration sensor 8 in the analysis system. The data analysis processor 9 is mainly composed of the data analysis processor 9. The data analysis processor 9 is connected to the CO2 concentration display 3 through the signal transmission optical fiber 11, stores the concentration data in real time, and processes the data to output a concentration trend graph. At the same time, it makes a prediction of the future trend based on the existing trend, which can be specifically represented by a dotted line. When the actual concentration value of CO2 exceeds the user-set limit, for example, the temperature control zone setting range is 300ppm-1000ppm, the system will automatically alarm and process, and at the same time output an adjustment signal to the central control cabinet 10 through the signal transmission optical fiber 11. The data analysis processor 9 can collect and store historical CO2 concentration data, and make a trend graph based on statistical data, which is specifically represented by a solid line. At the same time, it can make a predictive analysis of the subsequent trend based on the existing data and output the corresponding trend graph, which is specifically represented by a dotted line.

[0052] Specifically, when the actual CO2 concentration value is lower than the user-set limit, the frequencies of the blower 1 and the exhaust fan 5 are reduced, specifically, the air flow rate per unit time in the kiln is reduced.

[0053] In actual use, when the CO2 concentration in the kiln exceeds the upper and lower alarm limits set by the user, the CO2 analysis system will issue an alarm and simultaneously output an adjustment signal to the central control cabinet 10 via the signal transmission optical fiber 11. The control center receives the control signal output by the CO2 analysis system and automatically adjusts the frequency of the blower 1 and exhaust fan 5 accordingly. For example, if the user sets the concentration upper limit to 1000ppm, if the concentration exceeds the set upper limit of 1000ppm during actual monitoring, the data analysis processor 9 will output an adjustment signal to the control center to increase the exhaust frequency to reduce the CO2 concentration in the kiln, control the CO2 concentration in the kiln to maintain it within the set specification range, and maintain the furnace pressure within the specified range.

[0054] Specifically, the furnace pressure monitoring of the kiln can be carried out using the central control equipment of the kiln itself. The actual furnace pressure can be seen in the central control cabinet 10. During the actual regulation process, the furnace pressure data in the central control cabinet 10 can be read to maintain the furnace pressure within the specified range during the regulation process.

[0055] The present application realizes real-time monitoring and trend analysis of the CO2 atmosphere in the kiln and automatic regulation of the kiln through an atmosphere monitoring device, an atmosphere regulating device and a central control cabinet 10, which reduces the time and effort of manual regulation to a certain extent, can more accurately identify the line divisions in the production process, greatly improves production efficiency, and ensures product quality.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A kiln, characterized in that: include: Furnace body (4); An atmosphere monitoring device, the atmosphere monitoring device is used to monitor the CO2 concentration in the furnace body (4), and the atmosphere monitoring device includes a CO2 concentration sensor (8) arranged in the furnace body (4); An atmosphere regulating device comprises an air inlet component and an air outlet component, wherein the air inlet component is used to regulate the air inlet volume to the furnace body (4), and the air outlet component is used to regulate the air outlet volume of the furnace body (4).

2. The kiln according to claim 1, characterized in that The atmosphere monitoring device further comprises a CO2 concentration display (3), which is connected to the CO2 concentration sensor (8) for signal transmission so as to display the CO2 concentration value monitored by the CO2 concentration sensor (8).

3. The kiln according to claim 1, characterized in that The air inlet assembly comprises: A blower (1), the blower (1) being installed outside the furnace body (4); An air intake duct (6), the air intake duct (6) is installed inside the furnace body (4), the air intake duct (6) is provided with one or at least two kiln air inlets along the gas flow direction in the furnace body (4), and the blower (1) is used to supply air to the air intake duct (6).

4. The kiln according to claim 3, characterized in that The air outlet component includes: an exhaust fan (5), the exhaust fan (5) being installed outside the furnace body (4); An exhaust duct (2) is installed inside the furnace body (4), the exhaust duct (2) is provided with one or at least two kiln exhaust ports along the direction of gas flow in the furnace body (4), and the exhaust fan (5) is used to extract the gas in the exhaust duct (2).

5. The kiln according to claim 4, characterized in that The kiln air inlets and the kiln exhaust ports are the same in number and correspond one to one along the gas flow direction in the furnace body (4).

6. The kiln according to claim 5, characterized in that A plurality of temperature control zones are provided in the furnace body (4) along the gas flow direction, and all the temperature control zones are divided into a plurality of temperature unit groups along the gas flow direction, and each of the temperature unit groups is provided with a CO2 concentration sensor (8).

7. The kiln according to claim 6, characterized in that It also includes a valve body controller, wherein the kiln air inlet in each of the temperature unit groups is provided with an air inlet valve, and the kiln exhaust port in each of the temperature unit groups is provided with an exhaust valve, the CO2 concentration sensor (8) is connected to the valve body controller signal, and the valve body controller controls the opening of the air inlet valve and the exhaust valve.

8. The kiln according to claim 7, characterized in that The atmosphere monitoring device further comprises a CO2 concentration display (3), wherein the CO2 concentration display (3) is connected to the CO2 concentration sensor (8) by signal so as to display the CO2 concentration value monitored by the CO2 concentration sensor (8), and the CO2 concentration display (3), the air inlet valve, the air exhaust valve and the CO2 concentration sensor (8) are all connected to the valve body controller by signal.

9. The kiln according to claim 1, characterized in that It also includes a control device and an alarm device, wherein the CO2 concentration sensor (8) and the alarm device are both connected to the control device; when the CO2 concentration value received from the CO2 concentration sensor (8) exceeds a preset range, the control device controls the alarm device to sound an alarm.

10. The kiln according to any one of claims 1 to 9, characterized in that: The kiln is a sintering device for positive electrode materials of lithium cobalt oxide batteries.

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