CN114950715B - Coarse and refined coal classification and crushing equipment system in main re-selection system of heavy medium cyclone - Google Patents
Coarse and refined coal classification and crushing equipment system in main re-selection system of heavy medium cyclone Download PDFInfo
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- CN114950715B CN114950715B CN202210592352.5A CN202210592352A CN114950715B CN 114950715 B CN114950715 B CN 114950715B CN 202210592352 A CN202210592352 A CN 202210592352A CN 114950715 B CN114950715 B CN 114950715B
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- 239000003245 coal Substances 0.000 title claims abstract description 413
- 238000000926 separation method Methods 0.000 claims abstract description 56
- 238000002156 mixing Methods 0.000 claims abstract description 53
- 238000004939 coking Methods 0.000 claims abstract description 22
- 230000007306 turnover Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000012546 transfer Methods 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000006148 magnetic separator Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000007885 magnetic separation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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Abstract
The invention discloses a coarse clean coal classification and crushing equipment system in a heavy medium cyclone main re-selection system, which comprises a coarse clean coal medium removal sieve, a coarse clean coal crusher, a pre-sieve bifurcation chute and an undersize chute; the coarse clean coal medium-removing sieve dehydrates and removes medium of coarse clean coal separated by the main separation system, the front section is a medium-removing sieve plate section, the rear section is a grading sieve plate section, and the medium-removing and grading functions can be set by replacing sieve plates with different sieve slots; the pre-screen forking chute is connected with a coarse clean coal medium-removing screen, a coarse clean coal crusher and a coarse clean coal transferring scraper conveyor, and the flow direction of the material on the screen is changed by arranging the direction of a turnover material guide plate in the pre-screen forking chute; the undersize chute is connected with the coarse clean coal medium removal sieve and the fine selection mixing bucket, and the flow direction of undersize materials or mediums is changed by arranging the direction of a turning plate in the undersize chute; the equipment system provided by the invention can improve the recovery rate and quality of low-gray clean coal, can enable the coal preparation generating system to have the capability of producing power coal and coking coal blending, and can flexibly adjust the product structure.
Description
Technical Field
The invention relates to a grading and crushing equipment system in a heavy medium cyclone main recleaning system, in particular to a grading and crushing equipment system for crushing and dissociating coarse clean coal in a heavy medium cyclone main recleaning system for washing refractory coal with continuous gangue and difficult dissociation of clean coal.
Background
Coking coal and fat coal which can be used as main coking coal in coal resources in China belong to scarce variety coal resources. In the coke production, the proportion of coking coal blending such as gas coal is reasonably improved, the consumption of main coking coal can be saved, scarce coal resources can be saved, and the coke production cost can be reduced to a certain extent. In recent years, low-ash coking coal blending such as gas clean coal is paid attention to in coke production, the market demand of the low-ash coking coal blending in China is vigorous, the price is far higher than that of common power coal, and the price advantage is obvious. Therefore, the coal preparation plant adds a coking and coal blending recleaning process in the dynamic coal washing and sorting process, and the coking and coal blending is refined from the dynamic coal, so that the economic benefit of enterprises can be improved. The actual conditions of raw coal production of coal mines of coal washery matched with production mines have great influence change. If the ash content exceeds the standard when the roof and the bottom plate are constructed and cut; the adhesive index is low when the moving face is inverted or the single face is produced; the clean coal is hard and is difficult to be dissociated from the continuous bodies when the coal gangue is continuously produced, and the clean coal is difficult to be washed and selected. Therefore, the coal preparation production system matched with the mine can adapt to the coal quality change of raw coal produced by the mine, can flexibly adjust the product structure according to the market and the raw coal property, and can produce both a power coal supply power plant and a coking coal blending supply coking plant. The production system can further dissociate raw coal with harder coal quality and continuous production of gangue, so that the recovery rate of clean coal is improved, coal resources can be fully and high-quality utilized, and economic benefit can be improved. The main recleaning coal preparation process adopting the two-product heavy medium cyclone comprises a waste rock discharging process of a first-stage heavy medium main separation system and a second-stage heavy medium fine separation process. When gangue is discharged and the mixed coal product is used as power coal, the two-stage carefully selecting system can not be opened; when the low-gray clean coal products used as coking coal blending are washed, the primary dense medium selecting system and the secondary dense medium selecting system are all started. However, when the coking coal blending product is washed and selected from refractory coal which is produced by continuous production of coal gangue and is difficult to be dissociated by clean coal, the coarse clean coal which is mainly selected from the first section of dense medium is required to be crushed and dissociated further and then enters the second section of dense medium cyclone, so that the quality and the recovery rate of the clean coal can be improved. Therefore, a crushing process link for crushing and dissociating coarse clean coal with larger granularity is needed to be added in the main re-coal separation process of the heavy medium cyclone, and therefore, the installation of a classification and crushing equipment system for crushing and dissociating coarse clean coal in the main re-coal separation system of the heavy medium cyclone is very important.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a coarse clean coal classification and crushing equipment system in a main re-separation system of a heavy medium cyclone, wherein the coarse clean coal classification and crushing equipment system is responsible for classifying coarse clean coal separated in the main separation system, crushing and dissociating coarse clean coal with large granularity, and then entering a carefully-separating system; the heavy medium cyclone main recleaning system with the coarse and refined coal classification and crushing equipment system can flexibly adjust the product structure according to the properties of raw coal to determine the production of power coal or coking coal blending; but also can finely select the refractory coal with continuous production of gangue and has good recovery rate of clean coal.
In order to solve the problems, the invention provides a grading and crushing equipment system in a heavy medium cyclone main reselection system. The main recleaning system of the dense medium cyclone comprises a main screening system and a recleaning system, wherein the main screening system comprises a coarse screening dense medium cyclone, a gangue medium removal sieve, a coarse clean coal medium removal sieve and a coarse clean coal transfer scraper conveyor; raw coal enters the coarse separation dense medium cyclone after being subjected to desliming by the desliming screen and is separated into gangue and coarse clean coal; the gangue medium removal sieve and the coarse clean coal medium removal sieve dehydrate and remove medium from the gangue and the coarse clean coal to obtain gangue products and coarse clean coal products; the coarse clean coal products on the coarse clean coal medium-removing screen fall to the coarse clean coal transfer scraper conveyor; the secondary concentrating system comprises a concentrating dense medium cyclone, a concentrating mixing barrel, a medium coal removing sieve and a clean coal removing sieve; the dense medium cyclone is used for further refining the coarse refined coal separated in the main separation system, and separating the coarse refined coal into medium coal and low-ash refined coal, wherein the medium coal and the low-ash refined coal are respectively subjected to medium coal medium removal screening, dehydration and medium removal to obtain a medium coal product and a low-gray refined coal product; when washing and refining refractory coal which is continuously produced from coal gangue and is difficult to be dissociated from clean coal, coarse clean coal separated by the main separation system is required to be crushed and dissociated further and then enters the secondary separation system for separation; therefore, the dense medium cyclone main reselection system also comprises a coarse clean coal classification and crushing equipment system.
In order to solve the problems and achieve the aim of the invention, the classification and crushing equipment system in the heavy medium cyclone main reselection system provided by the invention adopts the following technical scheme that the coarse and refined coal classification and crushing equipment system in the heavy medium cyclone main reselection system comprises:
the coarse clean coal medium-removing sieve has the coarse clean coal classification function besides the function of dehydrating and medium-removing the coarse clean coal separated by the coarse dense medium cyclone in the main separation system; the coarse clean coal medium-removing screen is arranged on an elevated installation platform of a washing and selecting workshop, the front section of the coarse clean coal medium-removing screen is a medium-removing screen plate section, and the medium-removing screen plate is arranged to play a role in dewatering and medium-removing on the coarse clean coal; the rear section of the coarse clean coal medium removal sieve is a classifying screen plate section, and a medium removal screen plate or a classifying screen plate is optionally arranged to play a medium removal or classification role on the coarse clean coal; a qualified medium funnel and a diluted medium funnel for medium collection are arranged below the medium-removing sieve plate section of the coarse and clean coal medium-removing sieve, the qualified medium funnel is communicated with a coarse-separation qualified medium barrel, the diluted medium funnel is arranged in front of the qualified medium funnel, and the diluted medium funnel is communicated with a coarse-separation diluted medium barrel;
the coarse clean coal crusher is arranged on the installation platform and is positioned beside the coarse clean coal transfer scraper conveyor before the coarse clean coal is subjected to medium removal and screening; a discharge chute is arranged at a discharge port of the coarse clean coal crusher and is communicated with the carefully selected mixing bucket arranged below the mounting platform;
the pre-screen forking chute is arranged in front of the screen of the coarse clean coal medium removal screen, and is arranged above the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor; two discharge ports are arranged below the pre-screen forked chute and are respectively connected with a feed inlet of the coarse clean coal crusher and the end part of the coarse clean coal transfer scraper conveyor, and an upper port of the pre-screen forked chute is connected with an upper screen discharge port of the coarse clean coal medium-removing screen; the inside of the front-screen bifurcation chute is provided with a turnover guide plate at bifurcation, the turnover guide plate is rotatably connected with the side wall of the front-screen bifurcation chute, and the turnover guide plate respectively blocks the passages of materials and the coarse clean coal crusher and the passages of materials and the coarse clean coal transfer scraper conveyor at two limit positions;
the undersize chute is arranged below the classifying screen plate section of the coarse clean coal medium removal sieve and is communicated with the carefully chosen mixing barrel; the rear side of the upper section of the undersize chute is provided with a through hole communicated with the front end of the dilute medium funnel, the inside of the upper section of the undersize chute is provided with a turning plate, the turning plate is rotatably connected with the side wall of the undersize chute, the turning plate is turned backwards to a position to block the through hole and block the communication with the dilute medium funnel, the turning plate is turned forwards to a position to block the undersize chute and block the communication with the carefully selected mixing bucket.
Further, a guide plate operating device is arranged outside the front branching chute of the sieve, and the guide plate operating device is connected with a rotating shaft of the turnover guide plate and drives the turnover of the turnover guide plate; the under-screen chute is provided with a turning plate operating device, and the turning plate operating device is connected with a rotating shaft of the turning plate and drives the turning plate to turn over.
Further specifically, the guide plate operating device is an electric push rod or an electro-hydraulic push rod or an oil cylinder or an air cylinder, and the turning plate operating device is an electric push rod or an electro-hydraulic push rod or an oil cylinder or an air cylinder.
By adopting the technical scheme of the invention, when the power coal is washed, only the main separation system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with a medium removal screen plate, the overturning guide plate in the front-screen forking chute is overturned forwards to block the channel leading to the coarse clean coal crusher, and the channel leading to the coarse clean coal transfer scraper conveyor is opened; the turning plate in the undersize chute is turned forwards to stop the undersize chute in place, and the undersize chute is communicated with the dilute medium funnel. In this way, coarse clean coal (namely, power coal) obtained after coarse clean coal separated by the coarse dense medium cyclone of the main separation system is dehydrated and demerized by the coarse clean coal removing sieve falls onto the coarse clean coal transferring scraper conveyor from the coarse clean coal removing sieve through the pre-sieve branching chute; the dilute medium under the screen of the classifying screen plate section at the rear section of the coarse clean coal medium-removing screen enters the undersize chute and enters the dilute medium funnel, and is merged with the dilute medium removed at the front section of the coarse clean coal medium-removing screen and then is conveyed to the coarse clean medium barrel; and qualified mediums under the screen of the medium removal screen plate section of the coarse clean coal medium removal screen front section enter the qualified medium hopper and are conveyed to the roughing qualified medium barrel.
By adopting the technical scheme of the invention, when washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, and the main selection system is connected in series with the secondary selection system; the classifying screen plate section of the coarse clean coal medium removal screen is provided with a classifying screen plate, the overturning guide plate in the front-screen forking chute overturns backwards to block a channel leading to the coarse clean coal transfer scraper conveyor, so as to open a channel entering the coarse clean coal crusher, and the turning plate in the lower-screen chute overturns backwards to block the through hole, so as to open a channel leading to the fine selection mixing bucket. In this way, coarse clean coal separated by the coarse dense medium cyclone of the main separation system is dehydrated and medium removed by the coarse clean coal medium removing sieve, coarse clean coal with larger granularity obtained after classification falls to the coarse clean coal crusher from the coarse clean coal medium removing sieve through the pre-sieve branching chute to be crushed and dissociated, and coarse clean coal with small granularity enters the fine separation mixing bucket through the discharging chute under the coarse clean coal crusher; and small-granularity coarse clean coal under the classifying screen plate section of the coarse clean coal medium-removing screen enters the carefully chosen mixing bucket through the undersize chute. And (3) feeding the small-granularity coarse refined coal into the fine mixing bucket, and feeding the fine mixed coal into the secondary fine mixing system for fine mixing to obtain qualified low-gray refined coal which can be used as coking blended coal. And the separated qualified medium under the screen at the front section of the coarse and clean coal medium removing screen enters the qualified medium hopper and is conveyed to the coarse and clean qualified medium barrel, then the coarse and clean coal medium is recycled, the separated dilute medium enters the dilute medium hopper and is conveyed to the coarse and clean medium barrel, after further magnetic separation, the obtained qualified medium is recycled, and the obtained tailings enter a slime water treatment system for further treatment.
According to the embodiment of the invention, specifically, raw coal which is pretreated into the particle size of 50-0mm enters the main separation system after desliming treatment. When the power coal is washed and selected, only the main selection system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with medium removal screen plates, the screen gap of the medium removal screen plates is 1.0mm, the overturning guide plate in the pre-screen forked chute is overturned forwards to block the channel leading to the coarse clean coal crusher, and the turning plate in the undersize chute is overturned forwards to cut off the undersize chute in place, so that the undersize chute is communicated with the dilute medium hopper. By adopting the technical scheme, 50-1.0mm of materials are separated into gangue and coarse clean coal through the coarse separation dense medium cyclone, the gangue is subjected to medium removal to obtain gangue products, the coarse clean coal is subjected to medium removal through the coarse clean coal medium removal sieve to be dehydrated, the coarse clean coal products are obtained after medium removal, and the coarse clean coal products are dredged to the coarse clean coal transfer scraper conveyor through the pre-sieve branching chute and then are conveyed to the coarse clean coal product storage place. At this time, only qualified medium and lean medium are below the coarse and clean coal medium removal sieve, and the qualified medium and the lean medium are respectively discharged to the coarse and clean qualified medium barrel and the coarse and lean medium barrel through the qualified medium funnel and the lean medium funnel.
When washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, the classifying screen plate section of the coarse clean coal medium removal screen is replaced by the classifying screen plate, the length of the classifying screen plate section is 1200mm, and the screen gap of the classifying screen plate is 25mm; the turning guide plate in the pre-screen forked chute turns backwards to block a channel which is communicated with the coarse clean coal transferring scraper conveyor, a channel which is communicated with a feed inlet of the coarse clean coal crusher is opened, the turning plate in the undersize chute turns backwards to block the through hole, and a channel between the undersize chute and the carefully selected mixing barrel is opened. The coarse clean coal crusher is a double-toothed roller crusher, the feeding granularity of the double-toothed roller crusher is 50-25mm, and the discharging granularity is 25-0mm. By adopting the technical scheme, the coarse clean coal medium removal sieve has the functions of dehydration and medium removal and classification, the front section of the coarse clean coal medium removal sieve is used for dehydration and medium removal, the rear section of the coarse clean coal medium removal sieve is used for classification, and after classification, the granularity of coarse clean coal on the sieve is 50-25mm, and the granularity of coarse clean coal under the sieve is 25-0mm; coarse clean coal with the screen size of 50-25mm is guided into the coarse clean coal crusher by the pre-screen forking chute to be crushed and dissociated, and the coarse clean coal is crushed into materials with the granularity of 25-0mm and is discharged into the fine selection mixing barrel; discharging undersize coarse refined coal with the granularity of 25-0mm into the carefully chosen mixing bucket through the undersize chute; at this time, the qualified medium and the lean medium under the screen of the coarse and clean coal medium removal screen are respectively discharged to the coarse and clean qualified medium barrel and the coarse and lean medium barrel through the qualified medium hopper and the lean medium hopper.
In summary, the coarse clean coal classification and crushing equipment system in the main re-separation system of the dense medium cyclone provided by the invention can classify and crush and dissociate the coarse clean coal before entering the dense medium cyclone, thereby improving the recovery rate of low-gray clean coal and ensuring the quality of clean coal. Only the classifying screen plates of the rear section of the coarse clean coal medium removal screen are required to be provided as screen plates with different screen slits, for example, the screen slits are 25mm or 1.0mm; the turning guide plate in the pre-screen forked chute and the turning plate in the undersize chute are arranged in different directions, so that the product structure can be adjusted, and the aim of flexibly adjusting the product structure according to the properties of raw coal is fulfilled.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a flow chart of the main recleaning coal preparation system of the heavy medium cyclone according to the embodiment of the invention;
FIG. 2 is a schematic diagram of a main separation system device and coarse and refined coal classification and crushing equipment system of the coal separation system shown in FIG. 1;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic diagram of a coarse and fine coal classification and crushing equipment system in the coal preparation system shown in FIG. 2;
reference numerals:
100. a wet desliming system; 200. a dense medium sorting system; 201. a main selection system; 202. selecting the system again; 300. a slime water treatment system; 1000. coarse clean coal grading and crushing equipment system; p400, installing a platform;
w1, raw coal; w2, gangue; w3, coarse clean coal; w4, middlings; w5, clean coal; w6, gangue products; w7, middlings; w8, refined coal products;
1. a desliming screen; 2. a mixing barrel; 3. a coal slime water bucket; 4. coarse separation dense medium cyclone; 5. removing medium from gangue; 6. coarse clean coal medium removing sieve; 7. roughing a qualified medium barrel; 8. rough separation of thin medium barrels; 9. a rough concentration magnetic separator; 10. a coarse clean coal crusher; 11. selecting a mixing barrel; 12. carefully selecting a dense medium cyclone; 13. medium coal removing sieve; 14. fine coal medium removing sieve; 15. a middling centrifugal dehydrator; 16. a clean coal centrifugal dehydrator; 17. carefully selecting a qualified medium barrel; 18. carefully selecting a thin medium barrel; 19. selecting a first magnetic separator; 20. selecting a second magnetic separator; 30. a clean water tank; 31. a circulating water tank; 32. coarse clean coal transshipment scraper conveyor;
61. sieving an under-sieve chute; 62. a dilute medium funnel; 63. a qualified medium hopper; 64. a forked chute before screening; 65. a discharge chute; 66. a medium-removing sieve plate section; 67. a classifying screen plate section; 611. turning plate; 6110. a turning plate operating device; 641. turning over the material guide plate; 6410. and a guide plate operating device.
Detailed Description
The following detailed description of embodiments of the invention, and further illustrating the invention, is exemplary and is not to be construed as limiting the invention by way of example only.
The coarse and fine coal classification and crushing equipment system in the dense medium cyclone main re-selection system according to the embodiment of the invention is described in detail below with reference to fig. 1 to 4.
In the following, the composition and process flow chart of the main re-coal separation system of the heavy medium cyclone, which are mentioned in the invention, are described in detail with reference to fig. 1, for convenience of reading and description, the names of equipment and materials involved in the coal separation production process of the invention are marked in fig. 1, and text description is reserved, and the main coal flow line, the clean water line, the circulating water line, the qualified medium line, the dilute medium line, the slime water line, the gangue line and the magnetic separation tailing line in the coal separation production process are drawn by different lines, and are marked in the lower right corner of fig. 1.
As can be seen from fig. 1, the heavy medium cyclone main recleaning coal preparation system of the present invention comprises a wet desliming system 100, a heavy medium separation system 200, and a slime water treatment system 300; the wet desliming system 100 adopts a desliming screen 1 to desliming raw coal W1, desliming coal enters a mixing bucket 2, and coal slime enters a coal slime bucket 3; the slime water treatment system 300 performs separation and slime concentration treatment on the slime under the screen 1 of the wet desliming system 100 and the magnetic separation tailings generated in the heavy medium separation process 200, and the slime water treatment system 300 is not the core of the present invention and is not described in detail herein;
the apparatus of the production system shown in fig. 1 further comprises a clean water tank 30 for storing clean water and a circulating water tank 31, wherein the clean water tank 30 provides clean water for the circulating water tank 31 as additional water; the circulating water tank 31 is also connected with the desliming screen 1, the gangue medium-removing screen 5, the coarse clean coal medium-removing screen 6, the roughing qualified medium barrel 7, the medium coal medium-removing screen 13, the carefully-selected qualified medium barrel 17 and the clean coal medium-removing screen 14 and is supplied with water, and the detailed description is omitted.
The core part of the heavy medium cyclone main recleaning coal preparation system is a heavy medium separation system 200, and the heavy medium separation system 200 comprises a main separation system 201 and a recleaning system 202; the main separation system 201 comprises a desliming screen 1, a coarse dense medium cyclone 4, a gangue desliming screen 5, a coarse clean coal desliming screen 6 and a coarse clean coal transfer scraper conveyor 32; the coarse dense medium cyclone 4 is a two-product dense medium cyclone, and raw coal W1 enters the coarse dense medium cyclone 4 after desliming by a desliming screen 1 and is separated into gangue W2 and coarse clean coal W3; the gangue medium removing sieve 5 and the coarse clean coal medium removing sieve 6 respectively dehydrate and remove medium from the gangue W2 and the coarse clean coal W3 to obtain a gangue product W6 and a coarse clean coal product; the coarse clean coal products on the coarse clean coal medium removal screen 6 screen fall to a coarse clean coal transfer scraper conveyor 32; the secondary concentrating system 202 comprises a concentrating heavy medium cyclone 12, a concentrating mixing bucket 11, a medium coal removing sieve 13 and a clean coal removing sieve 14; the dense medium cyclone 12 is a dense medium cyclone of two products, the coarse refined coal after crushing and dissociation is separated into middle coal W4 and low-gray refined coal W5, and the middle coal W4 and the low-gray refined coal W5 are dehydrated and medium-removed by a middle coal medium-removing sieve 13 and a refined coal medium-removing sieve 14 respectively to obtain a middle coal product W7 and a low-gray refined coal product W8; however, when the refractory coal which is difficult to be dissociated from the gangue and clean coal is washed, the coarse clean coal separated by the main separation system 201 is further crushed and dissociated and then enters the secondary separation system 202 for separation; therefore, the dense medium cyclone main reselection system further comprises a coarse clean coal classification and crushing equipment system 1000.
FIGS. 2 and 3 are coarse and fine coal classification and crushing equipment systems of the coal preparation system according to the embodiment of the invention; for better observing the components of the coarse and refined coal classification and crushing equipment system, the coarse and refined coal crusher 10, the fine dense medium cyclone 12, the fine mixing bucket 11, the coarse and refined coal transfer scraper conveyor 32 and other devices and the arrangement relation thereof are separately drawn as shown in fig. 4. The coarse and fine coal classification and crushing equipment system 1000 mainly comprising the coarse and fine coal medium removal sieve 6, the coarse and fine coal crusher 10, the fine mixing bucket 11, the coarse and fine coal transfer scraper conveyor 32 and the corresponding connecting chute is further described below with reference to fig. 2, 3 and 4. As shown in fig. 2, 3 and 4, the coarse and fine coal classification and crushing equipment system 1000 in the heavy medium cyclone main reselection system comprises: coarse clean coal medium-removing screen 6, coarse clean coal crusher 10, pre-screen branching chute 64 and undersize chute 61.
As shown in fig. 2 and 4, the coarse clean coal dewatering screen 6 has a coarse clean coal W3 classification function in addition to a function of dewatering and dewatering coarse clean coal W3 separated by the coarse dense medium cyclone 4 in the main separation system 201; the coarse clean coal medium removing sieve 6 is arranged on an elevated installation platform P400 of the washing and selecting workshop, the front section of the coarse clean coal medium removing sieve 6 is a medium removing sieve plate section, and the medium removing sieve plate is arranged to play a role in dewatering and medium removing for coarse clean coal W3; the rear section of the coarse clean coal medium removal sieve 6 is a classifying sieve plate section 67, and a medium removal sieve plate or a classifying sieve plate is optionally arranged to play a medium removal or classification role on the coarse clean coal W3; a qualified medium funnel 63 and a lean medium funnel 62 for medium collection are arranged below the medium-removing sieve plate section 66 of the coarse and clean coal medium-removing sieve 6, the qualified medium funnel 63 is communicated with the coarse and clean qualified medium barrel 7, the lean medium funnel 62 is arranged in front of the qualified medium funnel 63, and the lean medium funnel 62 is communicated with the coarse and clean medium barrel 8.
As shown in fig. 2 and 3, the coarse clean coal breaker 10 is mounted on a mounting platform P400 and is positioned beside the coarse clean coal transfer scraper conveyor 32 before the coarse clean coal removing screen 6; a discharge chute 65 is arranged at the discharge port of the coarse clean coal crusher 10, and the discharge chute 65 is communicated with a carefully chosen mixing bucket 11 arranged below a mounting platform P400.
As shown in fig. 2 and 4, a pre-screen branching chute 64 is provided above the coarse clean coal breaker 10 and the coarse clean coal W3 transfer scraper conveyor 32 before the coarse clean coal removing screen 6 is screened; two discharge ports are arranged below the pre-screen forked chute 64 and are respectively connected with the feed port of the coarse clean coal crusher 10 and the end part of the coarse clean coal transferring scraper conveyor 32, and the upper port of the pre-screen forked chute 64 is connected with the upper discharge port of the coarse clean coal medium removing screen 6; the inside of the pre-screen fork chute 64 is provided with a turning guide plate 641 at the fork, the turning guide plate 641 is rotatably connected with the side wall of the pre-screen fork chute 64, and the turning guide plate 641 blocks the passage of the material and coarse clean coal breaker 10 and the material and coarse clean coal transfer scraper conveyor 32 at two limit positions respectively.
The undersize chute 61 is arranged below the classifying screen plate section 67 of the coarse clean coal medium removal screen 6, and the undersize chute 61 is communicated with the carefully chosen mixing bucket 11; the rear side of the upper section of the undersize chute 61 is provided with a through hole communicated with the front end of the dilute medium funnel 62, the inside of the upper section of the undersize chute 61 is provided with a turning plate 611, the turning plate 611 is rotatably connected with the side wall of the undersize chute 61, the turning plate 611 can turn backwards to the proper position to block the through hole and block the communication with the dilute medium funnel 62, and the turning plate 611 can turn forwards to the proper position to block the undersize chute 61 and block the communication with the carefully selected mixing drum 11.
Further in accordance with an embodiment of the present invention, as shown in fig. 4, a guide plate handling device 6410 is provided outside the pre-screen bifurcation chute 64, the guide plate handling device 6410 being connected to the rotating shaft of the flip guide plate 641 and driving the flip of the flip guide plate 641; a turning plate operating device 6110 is arranged outside the under-screen chute 61, and the turning plate operating device 6110 is connected with a rotating shaft of the turning plate 611 and drives the turning plate 611 to turn.
In the embodiment shown in fig. 4, the guide plate operating device 6410 is a hydraulic cylinder, the turning plate operating device 6110 is a hydraulic cylinder, and a matched hydraulic pump station is also required when the hydraulic cylinder is used for driving, which is not shown in fig. 4. In other embodiments, the guide plate manipulator 6410 is an electro-hydraulic push rod or an electric push rod or a cylinder, and the flap manipulator 6110 is an electro-hydraulic push rod or an electric push rod or a cylinder. In further embodiments, the guide plate manipulator 6410 and the flap manipulator 6110 employ a manually operated push rod device provided with a position locking device; when the direction of the turnover guide plate 641 or the turnover plate 611 needs to be changed, the turnover guide plate needs to be manually pushed into place, and the position is locked by adopting a position locking device.
By adopting the technical scheme of the invention, when the power coal is washed, only the main separation system 201 is started, the classifying screen plate section 67 of the coarse clean coal separating screen 6 is provided with a separating screen plate, the overturning guide plate 641 in the front-screen forking chute 64 overturns forwards to block the channel leading to the coarse clean coal crusher 10, and the channel leading to the coarse clean coal transferring scraper conveyor is opened; the flap 611 inside the undersize chute 61 is turned forward into position to shut off the undersize chute 61 and to communicate the undersize chute 61 with the lean medium hopper 62. In this way, the coarse clean coal W3 separated by the coarse dense medium cyclone 4 of the main separation system 201 is dehydrated and medium-removed by the coarse clean coal medium-removing sieve 6, and the obtained coarse clean coal product (namely power coal) falls from the coarse clean coal medium-removing sieve 6 to the coarse clean coal transfer scraper conveyor 32 through the pre-sieve branching chute 64; the dilute medium screened by the grading sieve plate section 67 at the rear section of the coarse and clean coal medium removal sieve 6 enters an undersize chute 61 and enters a dilute medium funnel 62, and after being converged with the dilute medium removed by the front section of the coarse and clean coal medium removal sieve 6, the dilute medium is conveyed to a coarse separation dilute medium barrel 8, and then is processed by a coarse separation magnetic separator 9 to obtain qualified medium, and the qualified medium is converged into a coarse separation qualified medium barrel 7; qualified mediums screened by the medium-removing sieve plate section 66 at the front section of the coarse and clean coal medium-removing sieve 6 enter the qualified medium hopper 63 and are conveyed to the coarse and clean qualified medium barrel 7.
By adopting the technical scheme of the invention, when washing and selecting low-ash coking coal blending, the main selection system 201 and the secondary selection system 202 are started, and the main selection system 201 is connected in series with the secondary selection system 202; the classifying screen plate section 67 of the coarse clean coal removing screen 6 is provided with a classifying screen plate, a turning guide plate 641 in a front-screen forking chute 64 turns backwards to block a passage leading to the coarse clean coal transferring scraper conveyor 32 and open a passage leading to the coarse clean coal crusher 10, and a turning plate 611 in an under-screen chute 61 turns backwards to block a through hole and open a passage leading to the fine selection mixing drum 11. In this way, coarse clean coal separated by the coarse dense medium cyclone 4 of the main separation system 201 is dehydrated and medium removed by the coarse clean coal medium removing sieve 6, coarse clean coal with larger granularity obtained after classification falls to the coarse clean coal crusher 10 from the coarse clean coal medium removing sieve 6 through the pre-sieve branching chute 64 to be crushed and dissociated, and coarse clean coal with small granularity after crushing enters the fine separation mixing bucket 11 through the discharging chute 65 under the coarse clean coal crusher 10; small-granularity coarse clean coal under the classifying screen plate section 67 of the coarse clean coal removing screen 6 enters the fine cleaning mixing bucket 11 through the undersize chute 61. The small-granularity coarse refined coal entering the refining mixing drum 11 enters a re-refining system 202 for refining, the medium coal W4 and the refined coal W5 are obtained through refining by a dense medium cyclone 12, the medium coal W4 is subjected to medium removal by a medium coal medium removal sieve 13, a medium coal centrifugal dehydrator 15 is dehydrated to obtain a medium coal product W7, the low-gray refined coal W5 is subjected to medium removal by a medium coal medium removal sieve 14, and the refined coal centrifugal dehydrator 16 is dehydrated to obtain a refined coal product W8, and the low-gray refined coal product W8 is used as a low-gray coking coal blending product.
As can be seen from fig. 1, the medium coal removing sieve 13 removes medium, the medium coal centrifugal dehydrator 15 removes medium from the clean coal removing sieve 14, the qualified medium removed from the clean coal centrifugal dehydrator 16 enters the fine-selection qualified medium barrel 17, the thin medium removed enters the fine-selection thin medium barrel 18, the medium in the fine-selection thin medium barrel 18 passes through the fine-selection magnetic separator, the qualified medium removed enters the fine-selection qualified medium barrel 17, the tailings enter the slime barrel 3, and then enter the slime water treatment system 300 for treatment. According to the actual requirement of the production system, one concentrating magnetic separator is sometimes used, and a plurality of concentrating magnetic separators are sometimes used, and 2 concentrating magnetic separators are used in the coal dressing system shown in fig. 1 and are respectively marked as a first concentrating magnetic separator 19 and a second concentrating magnetic separator 20. The separated qualified medium under the screen of the front section of the coarse and clean coal medium removal screen 6 enters a qualified medium funnel 63 and is conveyed to a coarse and clean qualified medium barrel 7, then the coarse and clean coal medium is recycled, the separated dilute medium enters a dilute medium funnel 62 and is conveyed to a coarse and clean medium barrel 8, after further magnetic separation, the obtained qualified medium is recycled, and the obtained tailings enter a slime water treatment system 300 for further treatment.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. The coarse clean coal classification and crushing equipment system in the heavy medium cyclone main recleaning system comprises a main recleaning system and a recleaning system; the main separation system comprises a coarse dense medium cyclone, a gangue medium removal sieve, a coarse clean coal medium removal sieve and a coarse clean coal transfer scraper conveyor; raw coal enters the coarse dense medium cyclone after desliming by a desliming screen and is separated into gangue and coarse clean coal; the gangue medium removal sieve and the coarse clean coal medium removal sieve dehydrate and remove medium from the gangue and the coarse clean coal to obtain gangue products and coarse clean coal products; the coarse clean coal products on the coarse clean coal medium-removing screen fall to the coarse clean coal transfer scraper conveyor; the secondary concentrating system comprises a concentrating dense medium cyclone, a concentrating mixing barrel, a medium coal removing sieve and a clean coal removing sieve; the dense medium cyclone is used for further refining the coarse refined coal separated in the main separation system, and separating the coarse refined coal into medium coal and low ash refined coal, wherein the medium coal and the low ash refined coal are respectively subjected to medium coal medium removal screening, dehydration and medium removal to obtain a medium coal product and a low ash refined coal product; the coarse clean coal classification and crushing equipment system in the heavy medium cyclone main reselection system comprises:
the coarse clean coal medium-removing sieve has the coarse clean coal classification function besides the function of dehydrating and medium-removing the coarse clean coal separated by the coarse dense medium cyclone in the main separation system; the coarse clean coal medium-removing screen is arranged on an elevated installation platform of a washing and selecting workshop, the front section of the coarse clean coal medium-removing screen is a medium-removing screen plate section, and the medium-removing screen plate is arranged to play a role in dewatering and medium-removing on the coarse clean coal; the rear section of the coarse clean coal medium removal sieve is a classifying screen plate section, and a medium removal screen plate or a classifying screen plate is optionally arranged to play a medium removal or classification role on the coarse clean coal; a qualified medium funnel and a diluted medium funnel for medium collection are arranged below the medium-removing sieve plate section of the coarse and clean coal medium-removing sieve, the qualified medium funnel is communicated with a coarse-separation qualified medium barrel, the diluted medium funnel is arranged in front of the qualified medium funnel, and the diluted medium funnel is communicated with a coarse-separation diluted medium barrel;
the coarse clean coal crusher is arranged on the installation platform and is positioned beside the coarse clean coal transfer scraper conveyor before the coarse clean coal is subjected to medium removal and screening; a discharge chute is arranged at a discharge port of the coarse clean coal crusher and is communicated with the carefully selected mixing bucket arranged below the mounting platform;
the pre-screen forking chute is arranged in front of the screen of the coarse clean coal medium removal screen, and is arranged above the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor; two discharge ports are arranged below the pre-screen forked chute and are respectively connected with a feed inlet of the coarse clean coal crusher and the end part of the coarse clean coal transfer scraper conveyor, and an upper port of the pre-screen forked chute is connected with an upper screen discharge port of the coarse clean coal medium-removing screen; the inside of the front-screen bifurcation chute is provided with a turnover guide plate at bifurcation, the turnover guide plate is rotatably connected with the side wall of the front-screen bifurcation chute, and the turnover guide plate respectively blocks the passages of materials and the coarse clean coal crusher and the passages of materials and the coarse clean coal transfer scraper conveyor at two limit positions;
the undersize chute is arranged below the classifying screen plate section of the coarse clean coal medium removal sieve and is communicated with the carefully chosen mixing barrel; the rear side of the upper section of the undersize chute is provided with a through hole communicated with the front end of the dilute medium funnel, the inside of the upper section of the undersize chute is provided with a turning plate, and the turning plate is rotatably connected with the side wall of the undersize chute; the turning plate is turned backwards to be in position to block the through hole and block the communication with the dilute medium hopper, and is turned forwards to be in position to block the undersize chute and block the communication with the carefully selected mixing bucket;
when the power coal is washed, only the main separation system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with a medium removal screen plate, the overturning guide plate in the front-screen bifurcation chute overturns forwards to block a channel leading to the coarse clean coal crusher, and a channel leading to a coarse clean coal transfer scraper conveyor is opened; the turning plate in the undersize chute turns forwards to stop the undersize chute in place, and the undersize chute is communicated with the dilute medium funnel; in this way, the coarse clean coal separated by the coarse dense medium cyclone of the main separation system is dehydrated and medium-removed by the coarse clean coal medium-removing sieve, and the obtained power coal falls onto the coarse clean coal transfer scraper conveyor from the coarse clean coal medium-removing sieve through the pre-sieve branching chute; the dilute medium under the screen of the classifying screen plate section at the rear section of the coarse clean coal medium-removing screen enters the undersize chute and enters the dilute medium funnel, and is merged with the dilute medium removed at the front section of the coarse clean coal medium-removing screen and then is conveyed to the coarse clean medium barrel; qualified mediums under the screen of the medium removal screen plate section of the coarse clean coal medium removal screen front section enter the qualified medium hopper and are conveyed to the roughing qualified medium barrel;
when washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, and the main selection system is connected in series with the secondary selection system; the classifying screen plate section of the coarse clean coal medium removal screen is provided with a classifying screen plate, the overturning guide plate in the front-screen forking chute overturns backwards to block a channel leading to the coarse clean coal transfer scraper conveyor, so as to open a channel entering the coarse clean coal crusher, and the turning plate in the under-screen chute overturns backwards to block the through hole, so as to open a channel leading to the fine selection mixing bucket; in this way, coarse clean coal separated by the coarse dense medium cyclone of the main separation system is dehydrated and medium removed by the coarse clean coal medium removing sieve, coarse clean coal with larger granularity obtained after classification falls to the coarse clean coal crusher from the coarse clean coal medium removing sieve through the pre-sieve branching chute to be crushed and dissociated, and coarse clean coal with small granularity enters the fine separation mixing bucket through the discharging chute under the coarse clean coal crusher; small-granularity coarse clean coal under the classifying screen plate section of the coarse clean coal medium-removing screen enters the carefully chosen mixing bucket through the undersize chute; and (3) feeding the small-granularity coarse refined coal into the fine mixing bucket, and feeding the fine mixed coal into the secondary fine mixing system for fine mixing to obtain qualified low-gray refined coal which can be used as coking blended coal.
2. The coarse clean coal classification and crushing equipment system in the heavy medium cyclone main reselection system of claim 1, wherein a guide plate operating device is arranged outside the front-screen bifurcation chute, and the guide plate operating device is connected with a rotating shaft of the overturning guide plate and drives the overturning of the overturning guide plate; the under-screen chute is provided with a turning plate operating device, and the turning plate operating device is connected with a rotating shaft of the turning plate and drives the turning plate to turn over.
3. The coarse clean coal classification and crushing equipment system in the heavy medium cyclone main reselection system of claim 1, wherein the coarse clean coal crusher is a double-toothed roller crusher, the feeding granularity of the double-toothed roller crusher is 50-25mm, and the discharging granularity is 25-0mm.
4. The coarse clean coal classification and crushing equipment system in the heavy medium cyclone main reselection system according to claim 1, wherein the coarse clean coal classification and crushing equipment system is characterized in that:
the granularity of the raw coal is 50-0mm;
the screen slot of the screen plate of the desliming screen is 1.0mm;
the screen gap of the medium-removing screen plate arranged on the coarse clean coal medium-removing screen is 1.0mm;
the length of the classifying screen plate section of the coarse clean coal medium removal screen is 1200 mm; when washing and selecting low-ash coking coal blending, the screen gap of the grading screen plate of the coarse clean coal medium removal screen is 25 mm.
5. The coarse clean coal classification and crushing equipment system in the heavy medium cyclone main reselection system according to claim 1, wherein the coarse clean coal classification and crushing equipment system is characterized in that: the coarse dense medium cyclone is a two-product dense medium cyclone, and the fine dense medium cyclone is a two-product dense medium cyclone.
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