CN118594745A - A control method to prevent sudden change of grinding particle size - Google Patents
A control method to prevent sudden change of grinding particle size Download PDFInfo
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- CN118594745A CN118594745A CN202410789215.XA CN202410789215A CN118594745A CN 118594745 A CN118594745 A CN 118594745A CN 202410789215 A CN202410789215 A CN 202410789215A CN 118594745 A CN118594745 A CN 118594745A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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Abstract
The invention discloses a control method for preventing the mutation of the granularity of milled powder, which comprises the following steps: conveying the materials in the raw material bin to a mill for crushing treatment through a feeding device, then conveying the materials to a primary particle size classification device and a secondary particle size classification device in sequence for particle size classification treatment, and collecting finished materials at a discharging device communicated with a discharging hole of the secondary particle size classification device; when the height of the material in the raw material bin reaches a first preset height, closing the feeding device, and closing the discharging device after the first preset time is reached; when the height of the materials in the raw material bin reaches a first preset height, adding the materials into the raw material bin; when the height of the material in the raw material bin is larger than the first preset height or the closing time of the blanking device reaches the second preset time, the feeding device and the blanking device are started at the same time. The invention also discloses a system for realizing the control method for preventing the mutation of the granularity of the milled powder. The control method can avoid the abrupt change of the granularity of the powder.
Description
Technical Field
The invention relates to the technical field of artificial graphite raw coke, in particular to a control method for preventing the mutation of grinding particle size.
Background
The artificial graphite is an important raw material for producing lithium batteries, and the current artificial graphite production process mainly comprises the following steps: drying raw coke, coarse breaking of raw coke, grinding of raw coke and asphalt, shaping of grinding, mixing, coating granulation, pre-carbonization, graphitization, screening, demagnetizing, mixing, post-carbonization, screening, demagnetizing, packaging and the like. The raw material coking grinding is the first procedure for influencing the granularity of artificial graphite, and the grinding granularity directly influences the granularity index of an artificial graphite product and further influences the pulping process and the volume energy density of the battery.
The most widely used raw material coke grinding device is a mechanical mill at present, and a mechanical grinding system mainly comprises a raw material bin, a screw feeder, a mill, a classifier, a cyclone separator, a bag-type dust remover, an induced draft fan and the like. The operation process comprises the following steps: raw coke after coarse crushing is pumped into a raw material bin through negative pressure, conveyed into a mill through a screw feeder, impacted and sheared through a hammer head rotating at high speed, and simultaneously high-frequency oscillation generated by high-speed rotation of air flow causes collision between the raw coke and a wall plate of a mill cavity and between the raw coke and the raw coke, so that the raw coke is further crushed, then conveyed to a classifier through ascending negative pressure air flow, particles with larger granularity collide with blades of the classifier rotating at high speed, fall into a mill material cavity to be crushed continuously, the particles with smaller granularity are conveyed to a cyclone separator through a gap between classifying blades by the negative pressure air flow, fall into the bottom of the cyclone separator, and are conveyed to a finished product bin or a ton bag through a discharge valve, and the milled raw coke can be obtained.
However, in the actual production process, after the raw material Jiao Mofen is produced, the granularity of the raw material is often suddenly changed due to unknown reasons, and a problem that the raw material coke powder is unqualified is caused due to larger granularity, so that the yield and the qualification rate are greatly reduced.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a control method and a control system for preventing the mutation of the granularity of grinding powder; the invention can greatly improve the pass rate of powder grinding and avoid the abrupt change of the granularity of powder by designing a proper control method.
The invention provides a control method for preventing the mutation of the granularity of milled powder, which comprises the following steps: conveying the materials in the raw material bin to a mill for crushing treatment through a feeding device, then conveying the materials to a primary particle size classification device and a secondary particle size classification device in sequence for particle size classification treatment, and collecting finished materials at a discharging device communicated with a discharging hole of the secondary particle size classification device;
when the height of the material in the raw material bin reaches a first preset height, closing the feeding device, and closing the discharging device after the first preset time is reached;
when the height of the materials in the raw material bin reaches a first preset height, adding the materials into the raw material bin;
when the height of the material in the raw material bin is larger than the first preset height or the closing time of the blanking device reaches the second preset time, the feeding device and the blanking device are started at the same time.
Preferably, when the feeding device is closed and the material added in the first preset time makes the height of the material in the raw material bin larger than the first preset height, the feeding device and the discharging device are simultaneously opened, and the operation of closing the discharging device is not executed.
When the height of the material in the raw material bin reaches the first preset height, the feeding device is closed, the discharging device is closed after the first preset time is reached, and the operations of adding the material into the raw material bin are not limited in sequence; the material is added into the raw material bin and the feeder is closed at the same time; or the material can be added into the raw material bin firstly, and then the feeder is closed; or the feeder is closed firstly, and then the material is added into the raw material bin; the material can be added into the raw material bin after the blanking valve is closed.
Preferably, the first preset height is less than or equal to 5-15% of the total height of the raw material bin; more preferably 10% or less of the total height of the raw stock bin.
Preferably, the first preset time is 170-190s; more preferably 180s.
Preferably, the second preset time is 20-30min; more preferably 30min.
Preferably, when the height of the material in the raw material bin reaches a second preset height, the feeding of the material into the raw material bin is stopped.
Preferably, the second preset height is 60-80% of the total height of the raw material bin; more preferably 80%.
Preferably, the material is raw coke for preparing artificial graphite.
The raw coke can be: needle coke, petroleum coke, calcined coke, and the like; the raw coke is the raw coke after coarse breaking.
Preferably, a material level detection device is arranged on the raw material bin and is used for detecting the height of materials in the raw material bin.
Preferably, the material transport is performed by means of a negative pressure air flow.
The raw material bin, the feeding device, the mill, the primary particle size classification device and the secondary particle size classification device are transported by negative pressure air flow.
The invention also provides a system for realizing the control method for preventing the mutation of the granularity of the milled powder.
Preferably, the system comprises: raw material bin, feeding device, mill, primary particle size grading device, secondary particle size grading device and discharging device; wherein, be provided with material level detection device on former feed bin.
Preferably, the discharge port of the raw material bin is communicated with the feeding device, the discharge port of the feeding device is communicated with the mill, the discharge port of the mill is communicated with the primary particle size classification device, the discharge port of the primary particle size classification device is communicated with the secondary particle size classification device, and the discharge port of the secondary particle size classification device is communicated with the discharging device.
Preferably, the feeding means is a feeder.
Preferably, the primary particle size classifying device is a classifier.
Preferably, the secondary particle size classifying device is a cyclone.
Preferably, the blanking device is a blanking valve.
Preferably, the discharge port of the secondary particle size classifying device is arranged at the bottom of the secondary particle size classifying device.
The discharge port of the classifier is arranged at the top of the classifier and is communicated with the side wall of the cyclone separator.
The discharge hole of the discharging valve can be communicated with a finished product bin, and the milled powder is collected in the finished product bin.
The system may further include: the top of the cyclone separator is communicated with the bag-type dust collector, and the bag-type dust collector is communicated with the induced draft fan.
Preferably, the level detection device comprises: a first level detection device and a second level detection device.
Preferably, the first level detection means detects a first preset height; the second material level detecting device detects a second preset height.
The control method can adopt a Distributed Control System (DCS) to realize interlocking control, and can also adopt manual control.
When manual control is adopted, when the height of the material in the raw material bin reaches a first preset height, the first material level detection device sends an alarm signal, then the feeding device is manually closed, and after the first preset time is reached, the feeding device is manually closed;
the feed inlet of the raw material bin can be communicated with the feeding bin filled with materials, and when the height of the materials in the raw material bin reaches a first preset height, the first material level detection device can send an alarm signal, and the feeding bin is opened manually to convey the materials into the raw material bin; when the height of the material in the raw material bin reaches a second preset height, the second material level detection device can send an alarm signal, the upper material bin is manually closed, and the material is stopped from being added into the raw material bin.
When implementing the interlocking control by adopting a Distributed Control System (DCS), the system is specifically operated as follows: the first material level detection device, the feeding device and the discharging device can form interlocking control through the controller by electric connection; when the height of the material in the raw material bin reaches a first preset height, closing the feeding device, and closing the discharging device after the first preset time is reached; when the height of the material in the raw material bin is larger than the first preset height or the closing time of the blanking device reaches the second preset time, the feeding device and the blanking device are simultaneously started; when the feeding device is closed and the material added in the first preset time is higher than the first preset height, the feeding device and the discharging device are simultaneously started, and the operation of closing the discharging device is not executed any more;
Motors are arranged in the feeding device and the blanking device, and when the interlocking control is carried out, the opening or closing of the feeding device and the blanking device can be realized by starting or stopping the motors; the feeding device can be a screw feeder, and the discharging device can be a cyclone discharging valve.
The feeding port of the raw material bin can be communicated with a feeding bin filled with materials, the feeding bin can be electrically connected with a first material level detection device through a controller to form interlocking control, and when the height of the materials in the raw material bin reaches a first preset height, the feeding bin is started to convey the materials into the raw material bin; the feeding bin can be electrically connected with the second material level detection device through the controller to form interlocking control, and when the height of the material in the raw material bin reaches a second preset height, the feeding bin is closed, and the material is stopped being added into the raw material bin.
The motor is arranged in the feeding bin, and when the interlocking control is performed, the motor can be started or stopped to realize the opening or closing of the feeding bin.
When a Distributed Control System (DCS) is adopted to realize interlocking control, when the system performs mill production, the DCS uses the interlocking; when switching the material and clearing the machine, then DCS excision above-mentioned interlocking, clear up the residual material in the device.
The inventor aims at the problem that the particle size of raw materials Jiao Mofen is always changed due to unknown reasons and larger particle size is generated after the raw materials Jiao Mofen are subjected to multiple researches, and finds that the particle size change is caused by insufficient grinding of the materials in a mill, and the inventor continuously searches and discovers that when the system is adopted for grinding the materials, as the whole system adopts negative pressure air flow to convey the materials, when the height of the materials in a raw material bin is reduced to a certain height, air enters the mill from the raw material bin through a feeder, so that the flow rate of the materials in the mill is increased, the retention time of the materials is shortened, in addition, the concentration of the materials in the mill is also reduced, the mutual collision frequency among the materials is reduced, the crushing is insufficient, and finally the particle size of the powder is enlarged;
Therefore, the inventor finds through multiple experiments that when the height of the materials in the raw material bin is reduced to a first preset height, the feeder and the blanking valve are closed, so that the increase of the flow rate of the materials in the mill can be avoided, the retention time and the concentration of the materials are improved, the materials can be fully crushed, and the abrupt change of the granularity of the powder is avoided; however, the inventor finds that when the feeder and the blanking valve are closed at the same time, the problems of powder spraying, overload and the like of the mill are easily caused by unsmooth discharge of the powder after a large amount of materials in the mill are milled, so that the inventor finally determines the scheme as follows: the feeder is closed firstly, and then the blanking valve is closed after the first preset time is reached, so that the abrupt change of the granularity of the powder can be avoided, the qualification rate of the powder is improved, and the problems of powder spraying, overload of the mill and the like of the mill can be avoided.
Drawings
Fig. 1 is a schematic diagram of the structure of a system for implementing a control method for preventing abrupt change of the particle size of milled powder according to the present invention.
Reference numerals illustrate: 1. raw material bin, 2, feeder, 3, mill, 4, grader, 5, cyclone separator, 6, cyclone blanking valve, 7, finished product bin, 8, bag dust remover, 9, dust removal blanking valve, 10, dust removal bin, 11, induced draft fan, 12, first material level detection device, 13, second material level detection device, 14, feeding motor, 15, cyclone blanking motor, 16, feeding motor, 17, feeding bin.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Example 1
As shown in fig. 1, the present embodiment provides a system for implementing a control method for preventing abrupt change of the particle size of milled powder, the system comprising: the cyclone separator comprises a raw material bin 1, a feeder 2, a mill 3, a classifier 4, a cyclone separator 5, a cyclone blanking valve 6, a finished product bin 7, a bag dust collector 8, a dust removal blanking valve 9, a dust removal bin 10, a draught fan 11, a first material level detection device 12, a second material level detection device 13, a feeding motor 14, a cyclone blanking motor 15, a feeding motor 16 and a feeding bin 17, wherein a discharge port of the feeding bin 17 is communicated with a feed port of the raw material bin 1, a discharge port of the raw material bin 1 is communicated with the feeder 2, a discharge port of the feeder 2 is communicated with the mill 3, a discharge port of the mill 3 is communicated with the classifier 4, a discharge port of the top of the classifier 4 is communicated with an upper side wall of the cyclone separator 5, a discharge port of the bottom of the cyclone separator 5 is communicated with the cyclone blanking valve 6, a discharge port of the cyclone blanking valve 6 is communicated with the finished product bin 7, the top of the cyclone separator 5 is communicated with the bag dust collector 8, a discharge port of the bag dust collector 8 is communicated with the draught fan 11, a discharge port of the bottom of the bag dust collector 8 is communicated with the dust removal blanking valve 9, the discharge valve 9 is communicated with the dust removal blanking valve 10, the cyclone blanking motor 10 is communicated with the first material level detection device is arranged on the side wall of the cyclone bin 1, and the cyclone blanking device is arranged on the top of the cyclone blanking bin 6, and the cyclone bin is provided with the top detection device is provided with the cyclone dust collector 1, and the material is provided with the material level detection device 13.
In the embodiment, when the system is operated, raw coke in an upper bin 17 is pumped into a raw material bin 1 for standby through negative pressure air flow, the raw coke is conveyed into a mill 3 through a feeder 2 for crushing treatment by the negative pressure air flow, the raw coke is conveyed to a classifier 4 by the rising negative pressure air flow, particles with larger granularity in the classifier 4 collide with high-speed rotating classifier blades and fall into a mill material cavity for grinding, the particles with smaller granularity are conveyed to a cyclone separator 5 through a classifier blade gap by the negative pressure air flow, the particles with larger granularity in the cyclone separator 5 fall into the bottom of the cyclone separator 5 and are conveyed to a finished product bin 7 through a cyclone blanking valve 6, and the ground raw coke can be obtained; particles with smaller granularity in the cyclone separator 5 are conveyed to the cloth bag dust collector 8 through negative pressure airflow, so that fine powder of the particles with smaller granularity is adsorbed on the outer wall of the filter bag, and falls into the cone bottom of the cloth bag dust collector after pulse back blowing, and is conveyed to the dust removal bin 10 through the dust removal blanking valve 9, so that fine powder can be obtained, and the fine powder can be used as a byproduct to be used as a raw material of other products; the negative pressure air flow is discharged by the induced draft fan 11. The magnitude of the negative pressure air flow is controlled by controlling the parameters of the induced draft fan 11.
The first level detecting device 12 and the second level detecting device 13 are used for detecting the height of raw coke in the raw material bin.
Example 2
A control method for preventing the mutation of the granularity of the milled powder comprises the following steps:
The control method adopts the system of the embodiment 1 and a Distributed Control System (DCS) to realize interlocking control;
Conveying raw coke in a raw material bin 1 into a mill 3 through a feeder 2 by negative pressure air flow for crushing treatment, conveying the crushed raw coke to a classifier 4 and a cyclone separator 5 in sequence by the negative pressure air flow for 2 times of particle size classification treatment, and collecting a finished product material at a cyclone blanking valve 6 communicated with a discharge hole of the cyclone separator, wherein the finished product material is collected in a finished product bin 7; wherein,
The first material level detecting device 12 is in interlocking control with a feeding motor 14 arranged on the feeder 2 and a cyclone blanking motor 15 arranged on the cyclone blanking valve 6 through an electric connection via a controller: when the raw coke height in the raw material bin is less than or equal to 10% of the total height of the raw material bin, stopping the feeding motor 14 (i.e. closing the feeder 2), and stopping the cyclone blanking motor 15 (i.e. closing the cyclone blanking valve 6) after 180 seconds;
When the height of the raw coke in the raw material bin is more than 10% of the total height of the raw material bin, the feeding motor 14 and the cyclone blanking motor 15 are started simultaneously (i.e. the feeder 2 and the cyclone blanking valve 6 are opened); when the feeding motor 14 is stopped and the raw coke added in 180 seconds is more than 10% of the raw coke in the raw material bin 1, the feeding motor 14 and the cyclone blanking motor 15 are started at the same time, and the operation of stopping the cyclone blanking motor 15 is not executed any more;
The feeding motor 16 arranged on the feeding bin 17 is electrically connected with the first material level detection device 12 to form interlocking control through the controller: when the height of the raw coke in the raw material bin is less than or equal to 10% of the total height of the raw material bin, starting a feeding motor 16 (namely opening a feeding bin 17) to convey the raw coke into the raw material bin;
The feeding motor 16 arranged on the feeding bin 17 and the second material level detection device 13 are electrically connected to form interlocking control through a controller: when the raw coke height in the raw coke bin is 80% of the total height of the raw coke bin, the feeding motor 16 is stopped (i.e. the feeding bin 17 is closed), and the raw coke is stopped from being added into the raw coke bin.
Continuously operating for 24 hours by using the control method of the embodiment 2 to grind raw coke, wherein the number of the grinding machine is 2MA, and the parameters of the induced draft fan are adjusted to ensure that the feeding speed of the grinding machine is 8Hz, the granularity grading frequency is 24-25Hz, the current of the induced draft fan is 46-48A, the raw coke is fed 10 times in total, and the total feeding amount is 14.81 tons; the particle size of the milled powder was sampled and measured from the finished silo at various time points, and the results are shown in Table 1.
TABLE 1 detection results
As can be seen from table 1: by adopting the control method, the system is stable in operation, and the phenomenon of label removal of the milled powder particle sizes at different time points is avoided.
Comparative example 1
The raw material coke grinding is carried out by using the existing mechanical grinding system, and a first material level detection device and a second material level detection device are not arranged on a raw material bin of the existing mechanical grinding system, and the other materials are the same as the embodiment 1;
conveying raw coke in a raw material bin to a mill for crushing treatment through a feeder by negative pressure air flow, conveying the crushed raw coke to a classifier and a cyclone separator for 2 times of particle size classification treatment through the negative pressure air flow, and collecting a finished product material at a cyclone blanking valve communicated with a discharge hole of the cyclone separator, wherein the finished product material is collected in the finished product bin;
By using the system and the method, 2 identical systems (mill numbers are 2MA and 2MB respectively) are adopted to continuously run for 11.5 hours to grind raw coke, parameters of a draught fan are regulated to ensure that the feeding speed of the mill is 8Hz, the granularity grading frequency is 24-25Hz, the current of the draught fan is 46-48A, and raw bins of the 2 systems are respectively fed for 8 times and respectively fed for 12.22 tons; the particle size of the milled powder was sampled and measured from the finished silo at various time points, and the results are shown in Table 2.
TABLE 2 detection results
As can be seen from table 2: when the existing mechanical grinding system is adopted for carrying out raw material coking grinding, abnormal mutation of the particle size index of 3 times of grinding occurs within 11.5 hours, so that the grinding is unqualified; after an operator detects the raw material bin, the raw material coke in the raw material bin is close to an empty bin state, only a small amount of materials are in the feeder, and air enters the grinding cavity of the grinding machine from the raw material bin through the feeder, so that the phenomenon of abrupt change and standard removal of the grinding index is caused.
Comparative example 2
"10% Of the total height of the raw material bin" is replaced by "4% of the total height of the raw material bin", and the other steps are the same as those in example 2. The results are shown in Table 3.
TABLE 3 detection results
As can be seen from table 3: when the first preset height is too low, the milled powder particle size is also liable to be disqualified.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
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