Automatic exhaust method and automatic exhaust equipment for lithium iron phosphate roller kiln

Abstract

The application discloses an automatic exhaust method and automatic exhaust equipment for a lithium iron phosphate roller kiln. The automatic exhaust equipment comprises at least one exhaust valve, at least one exhaust fan, a plurality of gas analyzers and a controller. One gas analyzer is installed in each kiln of the lithium iron phosphate roller kiln, and is used for detecting the gas concentration in the corresponding kiln. The controller controls the frequency of the frequency converter of the exhaust fan according to the gas concentration in each kiln, and controls the rotating speed of the corresponding exhaust fan and the opening degree of the exhaust valve by adjusting the frequency. The application can control the opening degree of the exhaust valve in each temperature zone according to the sintering process, can accurately adjust the opening degree of the exhaust valve, and can effectively control the stability of the furnace pressure in the kiln.

Description

Technical Field

[0001] This invention relates to an automatic exhaust method and automatic exhaust equipment, and more particularly to an automatic exhaust method and automatic exhaust equipment for a lithium iron phosphate roller kiln. Background Technology

[0002] Existing lithium iron phosphate roller kilns automatically adjust the exhaust fan speed based on furnace pressure monitoring data to maintain the furnace pressure within a certain range, thereby controlling the stability of the furnace pressure. However, current technology can only detect the total furnace pressure and cannot control the free frequency of the exhaust fan based on the gas composition of each kiln section. Furthermore, some equipment struggles to achieve variable frequency exhaust. Therefore, the furnace pressure of lithium iron phosphate roller kilns cannot be guaranteed to be maintained within a specific range in real time. Summary of the Invention

[0003] To address the technical problem that existing technologies cannot solve in ensuring that the furnace pressure of a lithium iron phosphate roller kiln is maintained within a certain range in real time, this invention provides an automatic exhaust method and automatic exhaust equipment for a lithium iron phosphate roller kiln.

[0004] This invention is achieved using the following technical solution: an automatic exhaust device for a lithium iron phosphate roller kiln, the automatic exhaust device comprising:

[0005] At least one exhaust valve for opening or closing the gas passage of the lithium iron phosphate roller conveyor, the exhaust valve being a proportional valve;

[0006] At least one exhaust fan is provided for discharging gas from the lithium iron phosphate roller kiln via the gas passage when the gas passage is open.

[0007] Multiple gas analyzers are installed in each section of the lithium iron phosphate roller kiln to individually detect the gas concentration in the corresponding kiln.

[0008] The controller is used to turn the exhaust fan on or off, and also to control the frequency of the frequency converter of the exhaust fan according to the gas concentration in each kiln section, thereby controlling the rotation speed of the corresponding exhaust fan and the opening degree of the exhaust valve by adjusting the frequency.

[0009] As a further improvement to the above scheme, by pre-determining a relationship table 1 that characterizes the one-to-one correspondence between the gas concentration and the frequency, the frequency can be obtained by knowing the gas concentration according to the relationship table 1.

[0010] or,

[0011] The gas concentration is proportional to the frequency. By pre-determining a relationship curve representing the one-to-one correspondence between the gas concentration and the frequency, the frequency can be obtained from the gas concentration based on the relationship curve.

[0012] Furthermore, by pre-determining a relationship table two that represents the one-to-one correspondence between the frequency and the rotational speed, the rotational speed can be obtained from the known frequency according to the relationship table two.

[0013] or,

[0014] By pre-determining a relationship curve 2 that represents the one-to-one correspondence between the frequency and the rotational speed, the rotational speed can be obtained from the known frequency based on the relationship curve 2.

[0015] Furthermore, by pre-determining a relationship table (Table 3) representing the one-to-one correspondence between the frequency and the opening degree, the opening degree can be obtained from the known frequency according to Table 3.

[0016] or,

[0017] By pre-determining a relationship curve 3 that represents the one-to-one correspondence between the frequency and the opening degree, the opening degree can be obtained from the known frequency based on the relationship curve 3.

[0018] As a further improvement to the above solution, the automatic exhaust device also includes:

[0019] Multiple cooling water pipes correspond one-to-one with multiple gas analyzers, and each cooling water pipe is used to cool the gas passing through the corresponding gas analyzer.

[0020] Furthermore, when the lithium iron phosphate roller kiln starts feeding, the controller turns on all gas analyzers, turns on all proportional valves, turns on one of the exhaust fans, and turns on all cooling water pipes.

[0021] Each gas analyzer is set with an upper limit for gas content. When each gas analyzer detects the gas concentration in each section of the kiln, the controller automatically adjusts the opening of the corresponding proportional valve according to the gas concentration, and at the same time adjusts the frequency of the corresponding exhaust fan.

[0022] Furthermore, when the lithium iron phosphate roller kiln starts feeding, the controller turns on all gas analyzers, turns on all proportional valves, turns on two of the exhaust fans, and turns on all cooling water pipes.

[0023] Each gas analyzer is set with an upper limit for gas content. When each gas analyzer detects the gas concentration in each section of the kiln, the controller automatically adjusts the opening of each proportional valve according to the gas concentration, and at the same time adjusts the frequency of each exhaust fan.

[0024] Furthermore, when the lithium iron phosphate roller kiln starts feeding, all gas analyzers are turned on, all proportional valves are turned on, three exhaust fans are turned on, and all cooling water pipes are turned on.

[0025] Each gas analyzer is set with an upper limit for gas content. When each gas analyzer detects the gas concentration in each kiln section, the controller automatically adjusts the opening of each proportional valve according to the gas concentration, and at the same time adjusts the frequency of each exhaust fan.

[0026] The present invention also provides an automatic venting method for a lithium iron phosphate roller kiln, the automatic venting method comprising the following steps:

[0027] The gas concentration in each section of the lithium iron phosphate roller kiln was individually measured;

[0028] The frequency of the frequency converter of the exhaust fan is controlled according to the gas concentration in each kiln section. The speed of the corresponding exhaust fan and the opening degree of the exhaust valve are controlled by adjusting the frequency.

[0029] As a further improvement to the above solution, the automatic venting method uses the automatic venting equipment of any of the above-mentioned lithium iron phosphate roller kilns to automatically vent the lithium iron phosphate roller kilns.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. Adding a gas analyzer to each kiln section allows for the determination of the atmosphere content in each temperature zone (i.e., each kiln section); since the gas content in each temperature zone can be analyzed independently, the opening of the exhaust valve in each temperature zone can be controlled according to the sintering process.

[0032] 2. Adding a proportional valve allows for precise adjustment of the exhaust valve opening.

[0033] 3. Increasing the number of exhaust fans can effectively control the stability of the furnace pressure inside the kiln. Attached Figure Description

[0034] Figure 1 A schematic diagram of the automatic exhaust device for a lithium iron phosphate roller kiln provided in a preferred embodiment of the present invention.

[0035] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0036] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0037] Figure 4 To adopt Figure 1Flowchart of the automatic exhaust method for automatic exhaust equipment. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Please see Figure 1 This is a schematic diagram of the automatic exhaust system for a lithium iron phosphate roller kiln provided in a preferred embodiment of the present invention. To illustrate this more clearly... Figure 1 The details in the image have been magnified locally, such as... Figure 2 As shown, Figure 2 for Figure 1 A magnified view of a portion of the image. Similarly, to better illustrate... Figure 2 The details in the image were magnified again, such as... Figure 3 As shown, Figure 3 for Figure 2 A magnified view of a portion of the image.

[0041] The automatic exhaust equipment of the lithium iron phosphate roller kiln includes at least one exhaust valve 1 (in this embodiment, 13 valves numbered 1-1# to 1-13# are used as an example), at least one exhaust fan 2 (in this embodiment, 3 exhaust fans numbered 2-1#, 2-2#, and 2-3# are used as an example), multiple gas analyzers 3 (in this embodiment, 13 gas analyzers numbered 3-1# to 3-13# are used as an example), a controller (not shown in the figure), and multiple cooling water pipes 4 (corresponding one-to-one with the number of gas analyzers 3, so in this embodiment, the number of cooling water pipes 4 is also 13, numbered 4-1# to 4-13#).

[0042] Exhaust valve 1 is used to open or close the gas channel of the lithium iron phosphate roller kiln. In this embodiment, a proportional valve is used. Exhaust fan 2 is used to discharge gas from the lithium iron phosphate roller kiln through the gas channel when the gas channel is open. Gas analyzer 3 is used to detect gas concentration. One gas analyzer 3 is installed in each kiln section of the lithium iron phosphate roller kiln to detect the gas concentration in the corresponding kiln individually. Controller (such as PLC or microcontroller) is used to open or close the exhaust fan 2, and also to control the frequency of the frequency converter of the exhaust fan 2 according to the gas concentration in each kiln section, thereby controlling the rotational speed of the exhaust fan 2 and the opening degree of the exhaust valve 1 by adjusting the frequency.

[0043] In this embodiment, the controller pre-defines a relationship table (Table 1) representing a one-to-one correspondence between the gas concentration and the frequency. Based on Table 1, the frequency can be obtained from the gas concentration. Similarly, a pre-defines a relationship table (Table 2) representing a one-to-one correspondence between the frequency and the rotational speed. Based on Table 2, the rotational speed can be obtained from the frequency. Furthermore, a pre-defines a relationship table (Table 3) representing a one-to-one correspondence between the frequency and the opening degree. Based on Table 3, the opening degree can be obtained from the frequency. Of course, in other embodiments, it can be assumed that the gas concentration is directly proportional to the frequency, and the relationship table can use a corresponding relationship curve to achieve the same function of the controller.

[0044] Please combine Figure 4 This invention relates to an automatic exhaust method for a lithium iron phosphate roller kiln, and the automatic exhaust equipment of this invention is configured according to the automatic exhaust method of this invention. The automatic exhaust method includes the following steps: individually detecting the gas concentration in each section of the lithium iron phosphate roller kiln; controlling the frequency of the frequency converter of the exhaust fan according to the gas concentration in each section of the kiln; and controlling the rotational speed of the corresponding exhaust fan and the opening degree of the exhaust valve by adjusting the frequency.

[0045] Because the gas temperature inside the kiln is too high, directly passing the gas through the gas analyzer 3 will affect the service life of the gas analyzer 3. The cooled gas can be passed through the gas analyzer 3 by adding a cooling water pipe 4.

[0046] This invention mainly consists of a gas analyzer 3, cooling water pipes 4, a proportional valve, and an exhaust fan 2. The opening degree of the proportional valve and the frequency of the exhaust fan 2 are adjusted based on the data from the gas analyzer 3 in each kiln section. When the gas analyzer 3 collects the content of different atmospheres in each temperature zone, it transmits the data to a PLC (or microcontroller) via communication. The PLC (or microcontroller) calculates the atmospheric data in the kiln and converts it into corresponding output quantities to adjust the frequency of the frequency converter of the exhaust fan 2, thereby controlling the speed of the exhaust fan 2 and the opening degree of the proportional valve.

[0047] When the kiln begins feeding, gas analyzers 3 (numbered 3-1# to 3-13#) are activated, proportional valves (numbered 1-1# to 1-13#) are activated, exhaust fan 2 (numbered 2-1#) is activated, and cooling water pipes 4 (numbered 4-1# to 4-13#) are activated. The upper limit for the concentration of each gas in each gas analyzer is set on the touchscreen. When gas analyzers 3 (numbered 3-1# to 3-13#) detect the concentration of each gas, the opening degree of proportional valves (numbered 1-1# to 1-13#) is automatically adjusted, and the frequency of exhaust fan 2 is adjusted simultaneously.

[0048] The present invention has the following beneficial effects:

[0049] 1. Adding a gas analyzer 3 to each kiln section can obtain the atmosphere content of each temperature zone (i.e., each kiln section); since the gas content of each temperature zone can be analyzed separately, the opening degree of the exhaust valve 1 of each temperature zone can be controlled according to the sintering process.

[0050] 2. By adding a proportional valve for adjustment, the opening degree of exhaust valve 1 can be precisely adjusted;

[0051] 3. Increasing the number of exhaust fans 2 can effectively control the stability of the furnace pressure inside the kiln.

[0052] This invention has been put into trial operation in our factory. We are now providing three debugging scenarios to demonstrate the feasibility, rationality, and effectiveness of this invention.

[0053] Debugging Example 1

[0054] When the kiln begins feeding, gas analyzers 3 (numbered 3-1# to 3-13#) are activated, proportional valves (numbered 1-1# to 1-13#) are activated, exhaust fan 2 (numbered 2-1#) is activated, and cooling water pipes 4 (numbered 4-1# to 4-13#) are activated. The upper limit for the content of each gas in each gas analyzer 3 is set on the touchscreen. When gas analyzers 3 (numbered 3-1# to 3-13#) detect the concentration of each gas, the opening degree of proportional valves (numbered 1-1# to 1-13#) is automatically adjusted, and the frequency of the exhaust fan is adjusted simultaneously.

[0055] Debugging Example 2

[0056] When the kiln begins feeding, gas analyzers 3 (numbered 3-1# to 3-13#) are activated, proportional valves (numbered 1-1# to 1-13#) are activated, exhaust fans 2 (numbered 2-1# and 2-2#) are activated, and cooling water pipes 4 (numbered 4-1# to 4-13#) are activated. The upper limit of the concentration of each gas in each gas analyzer 3 is set on the touchscreen. When gas analyzers 3 (numbered 3-1# to 3-13#) detect the concentration of each gas, the opening degree of proportional valves (numbered 1-1# to 1-13#) is automatically adjusted, and the frequency of exhaust fans 2 is adjusted simultaneously.

[0057] Debugging Example 3

[0058] When the kiln begins feeding, gas analyzers 3 (numbered 3-1# to 3-13#) are activated, proportional valves (numbered 1-1# to 1-13#) are activated, exhaust fans 2 (numbered 2-1# to 2-3#) are activated, and cooling water pipes 4 (numbered 4-1# to 4-13#) are activated. The upper limit of the concentration of each gas in each gas analyzer 3 is set on the touchscreen. When gas analyzers 3 (numbered 3-1# to 3-13#) detect the concentration of each gas, the opening degree of proportional valves (numbered 1-1# to 1-13#) is automatically adjusted, and the frequency of exhaust fans 2 is adjusted simultaneously.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An automatic exhaust system for a lithium iron phosphate roller kiln, the automatic exhaust system comprising: At least two exhaust valves are provided for opening or closing the gas passage of the lithium iron phosphate roller kiln. At least two exhaust fans are used to exhaust gas from the lithium iron phosphate roller kiln via the gas passage when the gas passage is open; Controller, which is used to turn the exhaust fan on or off; The automatic exhaust device is characterized in that it further includes: Multiple gas analyzers are installed in each section of the lithium iron phosphate roller kiln to individually detect the gas concentration in the corresponding kiln. The exhaust valve is a proportional valve; The controller is also used to control the frequency of the frequency converter of the exhaust fan according to the gas concentration in each kiln section, and to control the speed of the corresponding exhaust fan and the opening of the exhaust valve by adjusting the frequency. By pre-determining a relationship table 1 that characterizes the one-to-one correspondence between the gas concentration and the frequency, the frequency can be obtained from the gas concentration based on the relationship table 1. or, The gas concentration is directly proportional to the frequency. By pre-determining a relationship curve representing the one-to-one correspondence between the gas concentration and the frequency, the frequency can be obtained from the gas concentration based on the relationship curve. The automatic exhaust device also includes: multiple cooling water pipes corresponding to multiple gas analyzers, each cooling water pipe being used to cool the gas passing through the corresponding gas analyzer; When the lithium iron phosphate roller kiln starts feeding, the controller turns on all gas analyzers, turns on all proportional valves, turns on two or three exhaust fans, and turns on all cooling water pipes. Each gas analyzer is set with an upper limit for gas content. When each gas analyzer detects the gas concentration in each section of the kiln, the controller automatically adjusts the opening of each proportional valve according to the gas concentration, and at the same time adjusts the frequency of each exhaust fan.

2. The automatic exhaust equipment for the lithium iron phosphate roller kiln as described in claim 1, characterized in that, By pre-determining a relationship table two that represents the one-to-one correspondence between the frequency and the rotational speed, the rotational speed can be obtained from the known frequency according to the relationship table two. or, By pre-determining a relationship curve 2 that represents the one-to-one correspondence between the frequency and the rotational speed, the rotational speed can be obtained from the known frequency based on the relationship curve 2.

3. The automatic exhaust equipment for the lithium iron phosphate roller kiln as described in claim 1, characterized in that, By pre-determining a relationship table (Table 3) that represents a one-to-one correspondence between the frequency and the opening degree, the opening degree can be obtained from the known frequency, based on the relationship table (Table 3). or, By pre-determining a relationship curve 3 that represents the one-to-one correspondence between the frequency and the opening degree, the opening degree can be obtained from the known frequency based on the relationship curve 3.

4. An automatic exhaust method for a lithium iron phosphate roller kiln, characterized in that, The automatic exhaust method includes the following steps: The gas concentration in each section of the lithium iron phosphate roller kiln was individually measured; The frequency of the frequency converter of the exhaust fan is controlled according to the gas concentration in each kiln section. The speed of the corresponding exhaust fan and the opening of the exhaust valve are controlled by adjusting the frequency. The equipment used in the automatic exhaust method of the lithium iron phosphate roller kiln is the automatic exhaust equipment of the lithium iron phosphate roller kiln according to any one of claims 1-3.

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