CN110215981B - Stepped discharge air flow crushing, classifying and sorting device and method - Google Patents
Stepped discharge air flow crushing, classifying and sorting device and method Download PDFInfo
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- CN110215981B CN110215981B CN201910457204.0A CN201910457204A CN110215981B CN 110215981 B CN110215981 B CN 110215981B CN 201910457204 A CN201910457204 A CN 201910457204A CN 110215981 B CN110215981 B CN 110215981B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 156
- 238000007599 discharging Methods 0.000 claims abstract description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 24
- 239000011707 mineral Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims description 60
- 239000000463 material Substances 0.000 claims description 47
- 239000002245 particle Substances 0.000 claims description 47
- 238000010902 jet-milling Methods 0.000 claims description 13
- 235000009470 Theobroma cacao Nutrition 0.000 claims description 10
- 241000555745 Sciuridae Species 0.000 claims description 3
- 244000240602 cacao Species 0.000 claims 1
- 238000010494 dissociation reaction Methods 0.000 abstract description 4
- 230000005593 dissociations Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 244000299461 Theobroma cacao Species 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920002101 Chitin Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011847 coal-based material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000004079 vitrinite Substances 0.000 description 1
Classifications
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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
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
- B02C19/068—Jet mills of the fluidised-bed type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/08—Cleaning arrangements
Abstract
The invention discloses a step discharging air flow crushing, classifying and sorting device which comprises an air flow crushing unit and a step discharging unit, wherein the air flow crushing unit comprises a feeding bin, a screw feeder and an air flow crusher, a classifying screen is arranged at the upper part in the feeding bin, the feeding bin is arranged at a feeding port of the screw feeder, and a discharging port of the screw feeder is connected with a feeding port of the air flow crusher; the step discharging unit comprises a first-stage classifier, a second-stage classifier and a third-stage classifier which are sequentially connected, wherein a first-stage airflow sieve, a second-stage airflow sieve and a third-stage airflow sieve are respectively arranged at the inner lower parts of the first-stage classifier, the second-stage classifier and the third-stage classifier, and electromagnetic automatic discharging valves and secondary air inlets are respectively arranged at the outer sides of the lower parts of the first-stage classifier, the second-stage classifier and the third-stage classifier. The invention also provides a method for classifying and sorting the organic microscopic components and minerals in the coal by using the device. The invention has low energy consumption, full dissociation and high separation precision, and can realize the effective separation of organic microscopic components and minerals.
Description
Technical Field
The invention belongs to the technical field of mineral crushing and sorting, and particularly relates to a step discharge air flow crushing, classifying and sorting device and method.
Background
Along with the gradual reduction of high-quality coal resources in China, the requirements on coal quality are increasing in the further fine processing of coal chemical industry and coal-based materials. The organic micro-components and minerals in the coal have great influence on the deep processing and the fine utilization of the coal, and the separation and the enrichment of the micro-components and the minerals in the coal are effectively carried out, so that the method is an important way for realizing the quality and quality improvement utilization of the coal resource components. The organic microscopic components and minerals in the coal can be optimally separated only by fully separating. The occurrence state of minerals and microscopic components in coal shows that the sufficient dissociation of different components can be realized only by crushing the coal to finer granularity, and the differences of grindability, content and embedding form of different microscopic components (vitrinite, inertinite and chitin) in different coals are larger. Most of the conventional stripping modes (rod mill, ball mill and planetary mill) have the defects of high energy consumption, insufficient dissociation, low separation precision and the like, and cannot realize the effective separation of organic microscopic components and minerals. Therefore, it is important to develop a device and a method integrating selective crushing, efficient sorting, upgrading and quality improving.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a step discharge air flow crushing, classifying and sorting device which has low energy consumption, full dissociation and high sorting precision and can realize effective sorting of organic microscopic components and minerals.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a step row material jet milling classifying separation device which characterized in that: the air flow crushing device comprises an air flow crushing unit and a step discharging unit, wherein the air flow crushing unit comprises a feeding bin, a screw feeder and an air flow crusher, a classifying screen is arranged at the inner upper part of the feeding bin, an oversize discharge pipe is connected to an oversize outlet of the feeding bin, the feeding bin is arranged at a feed inlet of the screw feeder, a discharge outlet of the screw feeder is connected with a feed inlet of the air flow crusher, and the air flow crusher is positioned below the screw feeder; the step discharging unit comprises a first-stage classifier, a second-stage classifier and a third-stage classifier, wherein a discharge hole of the first-stage classifier is connected with a feed hole of the second-stage classifier, a discharge hole of the second-stage classifier is connected with a feed hole of the third-stage classifier, a feed hole of the first-stage classifier is connected with a discharge hole of the jet mill, a first-stage jet sieve is arranged at the lower part in the first-stage classifier, a second-stage jet sieve is arranged at the lower part in the second-stage classifier, a third-stage jet sieve is arranged at the lower part in the third-stage classifier, a first electromagnetic automatic discharge valve and a first secondary air inlet are arranged at the outer side of the lower part of the first-stage classifier, and a second electromagnetic automatic discharge valve and a second secondary air inlet are arranged at the outer side of the lower part of the second-stage classifier.
The step exhaust jet milling classifying and sorting device is characterized in that: the classifying screen is detachably arranged at the upper part in the feeding bin, and the pore diameter of the classifying screen is 0.5-2 mm.
The step exhaust jet milling classifying and sorting device is characterized in that: the jet mill is a collision type fluidized bed jet mill, and the primary classifier, the secondary classifier and the tertiary classifier are all squirrel cage type air classifiers.
The step exhaust jet milling classifying and sorting device is characterized in that: the primary airflow sieve, the secondary airflow sieve and the tertiary airflow sieve are all obliquely arranged, an included angle alpha between the primary airflow sieve and the horizontal plane is 25-40 degrees, an included angle beta between the secondary airflow sieve and the horizontal plane is 25-40 degrees, and an included angle gamma between the tertiary airflow sieve and the horizontal plane is 25-40 degrees.
The step exhaust jet milling classifying and sorting device is characterized in that: the first electromagnetic automatic discharge valve and the first secondary air inlet are respectively positioned at two sides of the lower part of the primary classifier, the second electromagnetic automatic discharge valve and the second secondary air inlet are respectively positioned at two sides of the lower part of the secondary classifier, and the third electromagnetic automatic discharge valve and the third secondary air inlet are respectively positioned at two sides of the lower part of the tertiary classifier.
The step exhaust jet milling classifying and sorting device is characterized in that: the mesh apertures of the primary airflow screen, the secondary airflow screen and the tertiary airflow screen are sequentially reduced.
The step exhaust jet milling classifying and sorting device is characterized in that: the mesh aperture of the primary air flow sieve is 50-100 mu m, the mesh aperture of the secondary air flow sieve is 20-50 mu m, and the mesh aperture of the tertiary air flow sieve is 5-20 mu m.
In addition, the invention also provides a method for classifying and sorting organic microscopic components and minerals in coal by using the device, which is characterized by comprising the following steps:
step one, raw coal is fed into a feed bin, screened by a classifying screen, oversize materials are discharged through an oversize material discharging pipe, undersize materials enter a screw feeder and are fed into an air flow pulverizer by the screw feeder to be pulverized, and the granularity of the raw coal after being pulverized by the air flow pulverizer is less than or equal to 500 mu m;
step two, raw coal crushed by the jet mill enters a first-stage classifier for first classification and separation, fine coal passing through the blade gaps of classifying blades of the first-stage classifier enters a second-stage classifier, larger particle coal which cannot pass through the blade gaps of classifying blades of the first-stage classifier falls to a first-stage jet sieve for first fine classification, and first secondary air enters the first-stage classifier through a first secondary air inlet, so that the particle coal on the screen surface of the first-stage jet sieve is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve to obtain I-level coarse powder, and the undersize is I-level fine powder;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier in the second step, enabling part of the fine coal passing through the gaps of the classifying blades of the secondary classifier to enter the tertiary classifier, enabling part of the larger particle coal which cannot pass through the gaps of the classifying blades of the secondary classifier to fall down to the secondary airflow sieve to carry out secondary fine classification, enabling the second secondary air to enter the secondary classifier through the second secondary air inlet, and enabling the particle coal on the screen surface of the secondary airflow sieve to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve to obtain grade II coarse powder, and the undersize is grade II fine powder;
step four, fine coal entering the three-stage classifier in the step three is subjected to final fine classification through a three-stage airflow sieve, and third secondary air enters the three-stage classifier through a third secondary air inlet, so that the fine coal on the sieve surface of the three-stage airflow sieve is fully dispersed; and discharging the screened cocoa objects through a third electromagnetic automatic discharge valve to obtain III-level coarse powder, wherein the screened objects are III-level fine powder.
The method is characterized in that: in the first step, the feeding speed of the screw feeder is 50 g/min-150 g/min, and the crushing pressure of the jet mill is 0.25 MPa-0.65 MPa.
The method is characterized in that: the rotating speeds of the classifying wheels of the primary classifier, the secondary classifier and the tertiary classifier are 4000 r/min-20000 r/min, and the pressures of the secondary air entering through the first secondary air inlet, the second secondary air inlet and the third secondary air inlet are 0.20 MPa-0.45 MPa.
Compared with the prior art, the invention has the following advantages:
1. the method is based on the technical theory of superfine grinding, gravity classification (the materials are classified according to granularity and density, the particles with larger granularity fall down, the particles with smaller granularity and density are further classified by a next classifier), and step separation (the materials are further separated by adopting air flow with different size sieve holes, so that the narrow particle size distribution of the products is ensured), and the purposes of high-efficiency separation, quality improvement and quality classification of coal are achieved.
2. The classifying screen disclosed by the invention can be used for removing sundries in coal and coal particles which do not meet the particle size requirement in advance, ensuring narrower feeding grade, providing a foundation for efficient crushing of a subsequent crushing unit, enabling mineral substances and organic microscopic components in the coal to be fully separated by the superfine crushing unit, ensuring the quality of each product through fine classification and fine regulation and control of step discharge, and realizing enrichment of different mineral substances and microscopic components in different products.
3. The method has multiple functions of crushing, grading and classifying, has the advantage of dry separation, has simple process flow and convenient operation, is especially suitable for separating mineral substances and organic microscopic components in coal, and is also suitable for superfine crushing and dry separation in the industries of chemical industry, energy sources, materials and the like.
4. Compared with the conventional stripping mode of microscopic components, the designed multistage grading step discharging process method has the advantages that the air flow with higher energy input is used for crushing, the air flow with lower energy input is used for fine separation, the whole system is reasonable in energy distribution and high in separation precision, minerals and microscopic components in coal can be effectively separated through particle size regulation and classification, a multistage target product is obtained, and further the grading quality-classifying and high-quality utilization of the coal is realized.
5. Aiming at the high-inertness group coal types, the method can be used for upgrading and classifying the coal to provide a basis for the next fine utilization, has a wide application range, and is also suitable for crushing and dry separation in the industries of chemical industry, energy, materials and the like.
6. The invention can separate organic microscopic components and minerals in the raw coal after the raw coal is crushed by the jet mill, and then sequentially classify the raw coal by a primary classifier, a secondary classifier and a tertiary classifier according to granularity and density, and finally obtain six products which are required by the products, wherein the quality of each product is different, and the purposes are different.
7. The device has scientific and reasonable structural design, simple method, less investment and high grading and sorting efficiency, realizes the enrichment of different components in the coal in the target product through step grading and sorting, has wide application range and is suitable for popularization and application.
The invention is described in further detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals illustrate:
1-a feed bin; 2-classifying screen; 3-a screen material discharging pipe;
4-a screw feeder; 5-jet mill; 6-a first-stage classifier;
7-a secondary classifier; 8-three-stage grader; 9-a first-level airflow screen;
10-a secondary airflow screen; 11-three-stage airflow sieve; 12-a first secondary air inlet;
13-a second secondary air inlet; 14-a third secondary air inlet;
15-a first electromagnetic automatic discharge valve; 16-a second electromagnetic automatic discharge valve;
17-a third electromagnetic automatic discharge valve.
Detailed Description
The invention describes a step discharge jet milling classifying and sorting device by example 1.
Example 1
The step discharging air current crushing, classifying and sorting device shown in fig. 1 comprises an air current crushing unit and a step discharging unit, wherein the air current crushing unit comprises a feeding bin 1, a screw feeder 4 and an air current crusher 5, a classifying screen 2 is arranged at the upper part in the feeding bin 1, an oversize discharge pipe 3 is connected at the oversize outlet of the feeding bin 1, the feeding bin 1 is arranged at the feed inlet of the screw feeder 4, the discharge outlet of the screw feeder 4 is connected with the feed inlet of the air current crusher 5, and the air current crusher 5 is positioned below the screw feeder 4; the step discharging unit comprises a first-stage classifier 6, a second-stage classifier 7 and a third-stage classifier 8, wherein a discharge hole of the first-stage classifier 6 is connected with a feed hole of the second-stage classifier 7, a discharge hole of the second-stage classifier 7 is connected with a feed hole of the third-stage classifier 8, a feed hole of the first-stage classifier 6 is connected with a discharge hole of the jet mill 5, a first-stage jet sieve 9 is installed at the lower part in the first-stage classifier 6, a second-stage jet sieve 10 is installed at the lower part in the second-stage classifier 7, a third-stage jet sieve 11 is installed at the lower part in the third-stage classifier 8, a first electromagnetic automatic discharging valve 15 and a first secondary air inlet 12 are arranged at the outer side of the lower part of the first-stage classifier 6, a second electromagnetic automatic discharging valve 16 and a second secondary air inlet 13 are arranged at the outer side of the lower part of the second-stage classifier 7, and a third electromagnetic automatic discharging valve 17 and a third secondary air inlet 14 are arranged at the outer side of the lower part of the third-stage classifier 8.
Wherein, raw coal is crushed by the jet mill 5 and then sequentially passes through the first-stage classifier 6, the second-stage classifier 7 and the third-stage classifier 8, and is classified according to the granularity and the density of coal particles. The secondary air entering through the first secondary air inlet 12, the second secondary air inlet 13 and the third secondary air inlet 14 is used for cleaning the primary air flow screen 9, the secondary air flow screen 10 and the tertiary air flow screen 11 respectively, so that the screen surface of the air flow screen is prevented from being blocked, and the classification efficiency of the air flow screen is improved.
In the embodiment, the classifying screen 2 is detachably arranged at the upper part in the feeding bin 1, and the mesh aperture of the classifying screen 2 is 0.5 mm-2 mm.
In this embodiment, the jet mill 5 is a collision type fluidized bed jet mill, and the primary classifier 6, the secondary classifier 7 and the tertiary classifier 8 are all squirrel cage air classifiers.
In this embodiment, the primary airflow screen 9, the secondary airflow screen 10 and the tertiary airflow screen 11 are all obliquely arranged, an included angle α between the primary airflow screen 9 and a horizontal plane is 25 ° to 40 °, an included angle β between the secondary airflow screen 10 and the horizontal plane is 25 ° to 40 °, and an included angle γ between the tertiary airflow screen 11 and the horizontal plane is 25 ° to 40 °.
In this embodiment, the first electromagnetic automatic discharge valve 15 and the first secondary air inlet 12 are respectively located at two sides of the lower portion of the primary classifier 6, the second electromagnetic automatic discharge valve 16 and the second secondary air inlet 13 are respectively located at two sides of the lower portion of the secondary classifier 7, and the third electromagnetic automatic discharge valve 17 and the third secondary air inlet 14 are respectively located at two sides of the lower portion of the tertiary classifier 8.
In this embodiment, the mesh apertures of the primary air flow screen 9, the secondary air flow screen 10 and the tertiary air flow screen 11 are sequentially reduced.
In this embodiment, the mesh aperture of the primary air flow screen 9 is 50 μm to 100 μm, the mesh aperture of the secondary air flow screen 10 is 20 μm to 50 μm, and the mesh aperture of the tertiary air flow screen 11 is 5 μm to 20 μm.
The present invention describes a step discharge jet milling classification method by examples 2 to 9.
Example 2
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 120g/min, and the crushing pressure of the jet mill 5 is 0.65MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 6000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.30MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 4000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.25MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 8000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.40MPa.
Example 3
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 50g/min, and the crushing pressure of the jet mill 5 is 0.3MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 20000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.25MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 10000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.30MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 16000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.45MPa.
Example 4
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 140g/min, and the crushing pressure of the jet mill 5 is 0.45MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 8000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.20MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 12000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.40MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 14000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.30MPa.
Example 5
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 100g/min, and the crushing pressure of the jet mill 5 is 0.5MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 4000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.35MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 16000r/min, and the pressure of the second secondary air entering from the second secondary air inlet 13 is 0.45MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 6000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.25MPa.
Example 6
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 60g/min, and the crushing pressure of the jet mill 5 is 0.45MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 10000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.25MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 14000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.30MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 20000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.40MPa.
Example 7
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 150g/min, and the crushing pressure of the jet mill 5 is 0.55MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 12000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.30MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 6000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.25MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 4000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.20MPa.
Example 8
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 100g/min, and the crushing pressure of the jet mill 5 is 0.6MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 16000r/min, and the pressure of the first secondary air entering from the first secondary air inlet 12 is 0.40MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 20000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.20MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 10000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.35MPa.
Example 9
In connection with fig. 1, the method for classifying and sorting organic micro-components and minerals in coal by using the device as described in example 1 comprises the following steps:
step one, raw coal is fed into a feed bin 1, screened by a classifying screen 2, oversize materials are discharged through an oversize material discharging pipe 3, undersize materials enter a screw feeder 4 and are fed into a jet mill 5 for crushing by the screw feeder 4, and the granularity of the raw coal after crushing by the jet mill 5 is less than or equal to 500 mu m; the feeding speed of the screw feeder 4 is 80g/min, and the crushing pressure of the jet mill 5 is 0.25MPa;
step two, raw coal crushed by the jet mill 5 enters the first-stage classifier 6 for first classification and separation, fine coal passing through the blade gaps of the classifying blades of the first-stage classifier 6 enters the second-stage classifier 7, larger particle coal which cannot pass through the blade gaps of the classifying blades of the first-stage classifier 6 falls to the first-stage jet sieve 9 for first fine classification, and first secondary air enters the first-stage classifier 6 through the first secondary air inlet 12, so that the particle coal on the sieve surface of the first-stage jet sieve 9 is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve 15 to obtain I-level coarse powder, and the undersize is I-level fine powder; the rotating speed of the classifying wheel of the primary classifier 6 is 14000r/min, and the pressure of the first secondary air entering through the first secondary air inlet 12 is 0.45MPa;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier 7 in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier 7 to enter the tertiary classifier 8, enabling part of the larger particle coal which cannot pass through the blade gaps of the classifying blades of the secondary classifier 7 to fall down to the secondary airflow sieve 10 for secondary fine classification, enabling the second secondary air to enter the secondary classifier 7 through the second secondary air inlet 13, and enabling the particle coal on the sieve surface of the secondary airflow sieve 10 to be fully dispersed; the oversize is discharged through a second electromagnetic automatic discharge valve 16 to obtain grade II coarse powder, and the undersize is grade II fine powder; the rotating speed of the classifying wheel of the secondary classifier 7 is 8000r/min, and the pressure of the second secondary air entering through the second secondary air inlet 13 is 0.35MPa;
step four, fine coal entering the three-stage classifier 8 in the step three is subjected to final fine classification through a three-stage airflow screen 11, and third secondary air enters the three-stage classifier 8 through a third secondary air inlet 14, so that the granular coal on the screen surface of the three-stage airflow screen 11 is fully dispersed; the screened cocoa is discharged through a third electromagnetic automatic discharge valve 17 to obtain III-level coarse powder, and the screened material is III-level fine powder; the rotating speed of the classifying wheel of the three-stage classifier 8 is 12000r/min, and the pressure of the third secondary air entering through the third secondary air inlet 14 is 0.25MPa.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a step row material jet milling classifying separation device which characterized in that: the air flow crushing device comprises an air flow crushing unit and a step discharging unit, wherein the air flow crushing unit comprises a feeding bin (1), a screw feeder (4) and an air flow crusher (5), a classifying screen (2) is arranged at the inner upper part of the feeding bin (1), an oversize discharge pipe (3) is connected to the oversize outlet of the feeding bin (1), the feeding bin (1) is arranged at the feeding hole of the screw feeder (4), the discharging hole of the screw feeder (4) is connected with the feeding hole of the air flow crusher (5), and the air flow crusher (5) is positioned below the screw feeder (4); the step discharging unit comprises a first-stage classifier (6), a second-stage classifier (7) and a third-stage classifier (8), wherein a discharge hole of the first-stage classifier (6) is connected with a feed hole of the second-stage classifier (7), a discharge hole of the second-stage classifier (7) is connected with a feed hole of the third-stage classifier (8), a feed hole of the first-stage classifier (6) is connected with a discharge hole of an air flow pulverizer (5), a first-stage air sieve (9) is arranged at the inner lower part of the first-stage classifier (6), a second-stage air sieve (10) is arranged at the inner lower part of the second-stage classifier (7), a third-stage air sieve (11) is arranged at the inner lower part of the third-stage classifier (8), a first electromagnetic automatic discharging valve (15) and a first secondary air inlet (12) are arranged at the outer side of the lower part of the first-stage classifier (6), a second electromagnetic automatic discharging valve (16) and a second secondary air inlet (13) are arranged at the outer side of the lower part of the second-stage classifier (7), and a third electromagnetic automatic discharging valve (14) and a third secondary air inlet (14) are arranged at the outer side of the third-stage classifier (8);
the jet mill (5) is a collision type fluidized bed jet mill, and the primary classifier (6), the secondary classifier (7) and the tertiary classifier (8) are all squirrel cage air classifiers;
the mesh apertures of the primary airflow screen (9), the secondary airflow screen (10) and the tertiary airflow screen (11) are sequentially reduced;
the mesh aperture of the primary air flow screen (9) is 50-100 mu m, the mesh aperture of the secondary air flow screen (10) is 20-50 mu m, and the mesh aperture of the tertiary air flow screen (11) is 5-20 mu m.
2. A step discharge jet milling classifying separator according to claim 1, wherein: the classifying screen (2) is detachably arranged at the inner upper part of the feeding bin (1), and the mesh aperture of the classifying screen (2) is 0.5-2 mm.
3. A step discharge jet milling classifying separator according to claim 1, wherein: the primary airflow screen (9), the secondary airflow screen (10) and the tertiary airflow screen (11) are all obliquely arranged, an included angle alpha between the primary airflow screen (9) and a horizontal plane is 25-40 degrees, an included angle beta between the secondary airflow screen (10) and the horizontal plane is 25-40 degrees, and an included angle gamma between the tertiary airflow screen (11) and the horizontal plane is 25-40 degrees.
4. A step discharge jet milling classifying separator according to claim 1, wherein: the first electromagnetic automatic discharge valve (15) and the first secondary air inlet (12) are respectively positioned on two sides of the lower part of the primary classifier (6), the second electromagnetic automatic discharge valve (16) and the second secondary air inlet (13) are respectively positioned on two sides of the lower part of the secondary classifier (7), and the third electromagnetic automatic discharge valve (17) and the third secondary air inlet (14) are respectively positioned on two sides of the lower part of the tertiary classifier (8).
5. A method for classifying and sorting organic micro-components and minerals in coal by using the apparatus of claim 1, comprising the steps of:
step one, raw coal is fed into a feed bin (1), screened by a classifying screen (2), oversize materials are discharged through an oversize material discharging pipe (3), undersize materials enter a screw feeder (4) and are fed into a jet mill (5) for crushing by the screw feeder (4), and the granularity of the raw coal after being crushed by the jet mill (5) is less than or equal to 500 mu m;
step two, raw coal crushed by the jet mill (5) enters the first-stage classifier (6) for first classification and separation, fine coal passing through the blade gaps of classifying blades of the first-stage classifier (6) enters the second-stage classifier (7), larger particle coal which cannot pass through the blade gaps of classifying blades of the first-stage classifier (6) falls to the first-stage jet sieve (9) for first fine classification, and first secondary air enters the first-stage classifier (6) through the first secondary air inlet (12) so that the particle coal on the sieve surface of the first-stage jet sieve (9) is fully dispersed; the oversize is discharged through a first electromagnetic automatic discharge valve (15) to obtain I-level coarse powder, and the undersize is I-level fine powder;
thirdly, carrying out secondary classification on the fine coal entering the secondary classifier (7) in the second step, enabling part of the fine coal passing through the blade gaps of the classifying blades of the secondary classifier (7) to enter the tertiary classifier (8), enabling part of the larger particle coal not passing through the blade gaps of the classifying blades of the secondary classifier (7) to fall into the secondary airflow sieve (10) for secondary fine classification, and enabling the second secondary air to enter the secondary classifier (7) through the second secondary air inlet (13) so that the particle coal on the sieve surface of the secondary airflow sieve (10) is fully dispersed; the oversize material is discharged through a second electromagnetic automatic discharge valve (16) to obtain grade II coarse powder, and the undersize material is grade II fine powder;
step four, fine coal entering the three-stage classifier (8) in the step three is subjected to final fine classification through a three-stage airflow screen (11), and third secondary air enters the three-stage classifier (8) through a third secondary air inlet (14), so that the granular coal on the screen surface of the three-stage airflow screen (11) is fully dispersed; and discharging the cocoa on the sieve through a third electromagnetic automatic discharge valve (17) to obtain III-level coarse powder, wherein the undersize is III-level fine powder.
6. The method according to claim 5, wherein: in the first step, the feeding speed of the screw feeder (4) is 50 g/min-150 g/min, and the crushing pressure of the jet mill (5) is 0.25 MPa-0.65 MPa.
7. The method according to claim 5, wherein: the rotating speed of a classifying wheel of the primary classifier (6) in the second step is 4000 r/min-20000 r/min, and the pressure of the first secondary air entering from the first secondary air inlet (12) is 0.20 MPa-0.45 MPa; in the third step, the rotating speed of a classifying wheel of the secondary classifier (7) is 4000 r/min-20000 r/min, and the pressure of the second secondary air entering from the second secondary air inlet (13) is 0.20 MPa-0.45 MPa; in the fourth step, the rotating speed of the classifying wheel of the three-stage classifier (8) is 4000 r/min-20000 r/min, and the pressure of the third secondary air entering through the third secondary air inlet (14) is 0.20 MPa-0.45 MPa.
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