CN113560033B - Intelligent coal powder removal washing and selecting system and method - Google Patents
Intelligent coal powder removal washing and selecting system and method Download PDFInfo
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- CN113560033B CN113560033B CN202110814450.4A CN202110814450A CN113560033B CN 113560033 B CN113560033 B CN 113560033B CN 202110814450 A CN202110814450 A CN 202110814450A CN 113560033 B CN113560033 B CN 113560033B
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Abstract
The invention discloses an intelligent coal powder removal washing and selecting system and method, and belongs to the field of coal sorting. Raw coal is fed into a scraping plate A for screening, materials are distributed to a relaxation sieve B or a cross sieve C for screening according to different heating values or different moisture of the raw coal, the materials on the screen are separated through a heavy medium separation unit after desliming, block clean coal, fine clean coal and gangue are obtained after dewatering through a medium separation sieve, a classifying screen and a centrifugal machine, and the slime water produced in the separation process is classified, concentrated, dewatered and the like to obtain coarse slime, fine slime and circulating water. And mixing the undersize material of the relaxation sieve B or the cross sieve C with coarse coal slime and fine coal to obtain a mixed coal product, and returning the circulating water to the system for recycling. The washing and selecting system can select different powder removing equipment according to different heating values and moisture of raw coal, so that powder removing and washing of coal is realized, the heating value of the coal is improved, and the washing and selecting system is practical and effective, and has a good application prospect in the field of coal sorting.
Description
Technical Field
The invention belongs to the field of coal technology and coal equipment, and relates to an intelligent coal powder removal and washing system and method.
Background
The calorific value is a main index for classifying and pricing the power coal, and the power coal with lower calorific value needs to be washed and selected to achieve the aim of upgrading. At present, the power coal washing is mainly performed by taking the powder removal and washing, so that the pressure of coal slime entering a washing system and coal slime water treatment links can be reduced, and the situation that the heating value is not increased due to 'ash water offset' caused by ash content reduction and water increase after the powder coal washing is avoided. In addition, the mesh size needs to be changed according to the coal quality change of raw coal in the powder removing link, when the heating value of the raw coal is reduced, the mesh size of the powder removing mesh needs to be reduced, and the washing amount is increased to enable the heating value of the product to meet the requirement; conversely, when the heating value of raw coal is high, the screen holes of the dust removing screen need to be enlarged. In summary, the de-powdering step before the power coal enters the washing becomes a key step of the whole washing and selecting system.
The relaxation sieve and the cross sieve are used for the powder removing link, the relaxation sieve is used for sieving with the size of more than 13mm, and when the moisture of raw coal is less than 10%, the sieving efficiency is higher, and the relaxation sieve adopts a polyurethane sieve plate, so that the replacement and the assembly are convenient, and the size of the sieve hole is convenient to adjust. However, when the sieve pores are smaller than 13mm or the moisture of raw coal is larger than 10%, the powder is removed by a relaxation sieve to easily cause the phenomenon of pasting sieve pores, and the sieving efficiency is remarkably reduced.
The cross screen is newly developed screening equipment in recent years, and the materials are forced to be screened by utilizing the rotation of a plurality of groups of high-strength wear-resistant metal sheets, so that the phenomenon of blocking of screen holes is avoided, and the cross screen is particularly suitable for fine fraction screening of wet materials. However, the interval between the cross sieve plates is fixed, the size of sieve holes is inconvenient to adjust, and the condition of fluctuation of coal quality is difficult to adapt.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent coal powder-removing washing system and method, which aim to solve the problems that the screening mesh phenomenon is easily caused by using a relaxation screen for powder removal in the prior art, and the screening efficiency is obviously reduced; the interval between the cross sieve plates is fixed, the sieve pore size is inconvenient to adjust, and the defect technical problem of coal fluctuation condition is difficult to adapt to.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides an intelligent coal powder-removing washing and selecting system which comprises an intelligent raw coal powder-removing unit, a heavy medium sorting unit and a slime water treatment unit;
the raw coal intelligent powder removing unit comprises a scraping plate, a relaxation sieve, a cross sieve and a desliming sieve; raw coal to be treated flows through a scraper to obtain relaxation sieve raw coal and cross sieve raw coal, and the relaxation sieve raw coal flows through a relaxation sieve to obtain undersize products of the relaxation sieve and oversize products of the relaxation sieve; the raw coal of the cross screen flows through the cross screen to obtain undersize products of the cross screen and oversize products of the cross screen; the oversize products of the relaxation sieve and the oversize products of the cross sieve flow into the desliming sieve to be separated to obtain undersize water of the desliming sieve and the oversize products of the desliming sieve;
the heavy medium separation unit is used for treating the oversize material of the desliming screen obtained by the raw coal intelligent desliming unit to obtain gangue and block clean coal;
the coal slime water treatment unit is used for treating the undersize of the relaxation screen, the undersize of the cross screen, the undersize of the desliming screen and the oversize of the desliming screen obtained by the raw coal intelligent powder removal unit to obtain filter-pressed coal slime and mixed coal.
Preferably, the mesh distance of the relaxation sieve is 13-25mm.
Preferably, the cross-screen has a mesh distance of 3-13mm.
Preferably, the dense medium separation unit comprises dense medium separation equipment, a clean coal medium removal sieve, a gangue medium removal sieve, a classifying screen, a centrifuge and a medium recovery system;
the heavy medium separation equipment is used for separating the oversize material of the desliming sieve to obtain a light product of the heavy medium separation equipment and a heavy product of the heavy medium separation equipment; the light products of the heavy medium separation equipment are sent into a clean coal medium removal sieve to obtain clean coal medium removal sieve oversize products and clean coal medium under the clean coal medium removal sieve, the clean coal medium removal sieve oversize products flow through a classifying screen to obtain lump clean coal and clean coal, and the clean coal flows through a centrifuge to obtain centrifugal liquid of a dust clean coal and a clean coal centrifuge;
the heavy products of the heavy medium separation equipment are sent into a gangue removing medium sieve for obtaining gangue and medium under the gangue removing medium sieve; the medium recovery system is used for mixing and processing the medium under the gangue medium removal sieve, the medium under the clean coal medium removal sieve and the centrifugate of the clean coal centrifuge, obtaining qualified medium and then injecting the qualified medium into the heavy medium separation equipment to realize separation operation.
Preferably, the heavy medium sorting equipment is a shallow slot sorter, a bevel wheel sorter, a vertical wheel heavy medium sorter or a heavy medium cyclone.
Preferably, the medium recycling system comprises a medium purifying recycling system for combining medium split stream and dilute medium magnetic separation.
Preferably, the slime water treatment unit comprises a slime water barrel, a slurry pump, a classification cyclone, an arc screen, a slime centrifuge, a thickener and a filter press;
the coal slime bucket is used for pumping undersize water of the desliming sieve to the classifying cyclone through the slurry pump for classifying treatment, obtaining classifying cyclone overflow and classifying cyclone underflow, and sending the classifying cyclone underflow to the arc sieve for dehydrating treatment, so as to obtain undersize water of the arc sieve and oversize matters of the arc sieve; the oversize material of the arc screen is sent into a slime centrifugal machine for dehydration treatment, and centrifugal liquid and coarse slime of the slime centrifugal machine are obtained; mixing the overflow of the classifying cyclone, the sewage of the arc screen and the centrifugal liquid of the slime centrifugal machine through a thickener to obtain thickener overflow and thickener underflow, and sending the thickener underflow into a filter press to obtain filter press filtrate and filter press slime;
and mixing the obtained coarse coal slime, the fine coal powder, undersize of the relaxation sieve and undersize of the cross sieve to obtain the mixed coal.
Preferably, the slime water treatment unit further comprises a circulating water tank and a pump;
the circulating water tank is used for mixing the overflow of the thickener with the filtrate of the filter press to obtain a mixed product, and the mixed product is respectively sent to the desliming sieve, the clean coal medium-removing sieve and the gangue medium-removing sieve through a pump.
The invention also provides a method of the intelligent coal powder removal washing system, which comprises the following steps:
s1, feeding raw coal into a scraper of an intelligent raw coal powder removing unit, according to the difference of heating value and moisture of the raw coal, processing the raw coal in the scraper to obtain a relaxation sieve raw coal and a cross sieve raw coal, feeding the relaxation sieve raw coal into a relaxation sieve to carry out powder removing treatment to obtain a screen lower object of the relaxation sieve and a screen upper object of the relaxation sieve, feeding the cross sieve raw coal into a cross sieve to carry out powder removing treatment to obtain a screen lower object of the cross sieve and a screen upper object of the cross sieve, and feeding the screen upper object of the relaxation sieve and the screen upper object of the cross sieve into a desliming sieve to obtain screen lower water of the desliming sieve and screen upper objects of the desliming sieve;
s2, sorting the oversize materials of the desliming sieve to obtain gangue and lump clean coal; classifying the undersize water of the desliming screen, carrying out arc screening, centrifuging, concentrating and filter pressing treatment to obtain filter-pressed coal slime; and combining undersize of the relaxation sieve, undersize of the cross sieve, undersize of the desliming sieve and oversize of the desliming sieve to obtain the mixed coal.
Preferably, when the moisture of the raw coal is more than 10% or the heating value of the raw coal is less than 4500kcal/kg, the raw coal enters a cross screen for screening; when the moisture of the raw coal is less than or equal to 10 percent or the heating quantity of the raw coal is higher than 4500kcal/kg, the raw coal enters a relaxation sieve to be screened.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses an intelligent coal powder-removing washing and selecting system which comprises an intelligent raw coal powder-removing unit, a heavy medium sorting unit and a slime water treatment unit, wherein materials are distributed to a relaxation sieve or a cross sieve for sieving according to the heat productivity and the moisture change of raw coal of the intelligent raw coal powder-removing unit. The scheme can fully exert the advantages of the relaxation sieve and the cross sieve, select the equipment for removing the powder according to the heating value and the moisture change of raw coal, improve the powder removing efficiency and realize the aim of upgrading the power coal. The coal slime entering washing can be reduced, the pressure of a slime water treatment link is reduced, and the situation that the heating value is not increased due to 'ash water offset' caused by ash reduction and water increase after washing and selecting of the tail coal is avoided. And the conventional dense medium separation unit and the slime water treatment unit are combined to realize the powder removal and washing of coal. Different powder removing devices can be selected according to the difference of the heating value and the moisture of raw coal, so that the powder removing and washing of coal can be realized, the heating value of the coal can be improved, and the method is practical and effective.
Further, the mesh distance of the relaxation sieve is set to be 13-25mm, the mesh distance of the cross sieve is set to be 3-13mm, and raw coal can be combined with heat and moisture of the raw coal according to the mesh size to enter the relaxation sieve and the cross sieve respectively, so that the powder removal is more thorough.
Further, the shallow slot separator realizes separation according to the floating and sinking principle, and has high separation efficiency; the oblique wheel sorting machine has small impact force on commodities, and the sorting is quick and accurate; the vertical wheel heavy medium separator has high separation efficiency and low power consumption; the heavy medium cyclone has high separation efficiency, wide separation density adjustment range and easy automation in the production process.
Further, the provision of a medium recovery system in the heavy medium sorting unit can reduce waste of material.
Furthermore, a water circulation water tank is arranged in the slime water treatment unit, so that the water can be recycled.
The invention also provides a method of the intelligent coal powder removal washing system, different products can be obtained according to the steps of the method, and the method has good application prospects in the fields of coal technology and coal equipment.
Drawings
FIG. 1 is a flow chart of an intelligent coal powder removal and washing process of the invention;
FIG. 2 is a block diagram of the intelligent coal de-dusting and washing equipment of the invention.
Wherein, 1-raw coal; 2-relaxation screening of raw coal; 3-cross screening raw coal; 4-undersize of the relaxation screen; 5-screen oversize of the relaxation screen; 6-undersize of a cross screen; 7-oversize product of the cross screen; 8-undersize water of a desliming screen; 9-screen oversize material of the desliming screen; 10-light products of a heavy media separation apparatus; 11-heavy product of a heavy media separation apparatus; 12-removing medium and screen oversize materials of the clean coal; 13-medium under the sieve of the clean coal medium removal sieve; 14-gangue; 15-removing medium under the medium sieve by the gangue; 16-block of clean coal; 17-clean coal; 18-finely divided coal; 19-centrifugate of the clean coal centrifuge; 20-classifying cyclone overflow; 21-classifying cyclone underflow; 22-sieve-arc sieve offwater; 23-arc screen oversize; 24-coal slime centrifugal machine centrifugate; 25-coarse coal slime; 26-thickener overflow; 27-thickener underflow; 28 filter press filtrate; 29-filter pressing coal slime; 30-qualified medium; a-scraping plate; b-relaxation sieve; c-cross screening; d, desliming screen; e-a coal slime water bucket; f-heavy medium sorting equipment; g-refined coal medium removal sieve; h-gangue medium removing sieve; i-classifying screen; j-centrifuge; k-medium recovery system; l-stage cyclone; m-arc screen; an N-slime centrifuge; an O-concentrator; p-press filter; q-a circulating water tank; r-slurry pump; s-pump.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1 and 2, the invention also discloses an intelligent coal powder-removing and washing system and an intelligent coal powder-removing and washing method, referring to fig. 2, the intelligent coal powder-removing and washing system comprises an intelligent raw coal powder-removing unit, a heavy medium sorting unit and a slime water treatment unit;
the raw coal intelligent powder removing unit comprises a scraping plate A, a relaxation sieve B, a cross sieve C and a desliming sieve D; raw coal 1 to be treated flows through a scraper A to obtain relaxation sieve raw coal 2 and cross sieve raw coal 3, and the relaxation sieve raw coal 2 flows through a relaxation sieve B to obtain a relaxation sieve undersize 4 and a relaxation sieve oversize 5; the raw coal 3 of the cross screen flows through the cross screen C to obtain undersize 6 of the cross screen and oversize 7 of the cross screen; the oversize 5 of the relaxation sieve and the oversize 7 of the cross sieve flow into the desliming sieve D to be separated to obtain undersize 8 of the desliming sieve and the oversize 9 of the desliming sieve;
the heavy medium separation unit is used for treating the oversize 9 of the desliming screen obtained by the raw coal intelligent desliming unit to obtain gangue 14 and lump clean coal 16;
the coal slime water treatment unit is used for treating the under-screen 4 of the relaxation screen, the under-screen 6 of the cross screen, the under-screen water 8 of the desliming screen and the over-screen 9 of the desliming screen, which are obtained by the raw coal intelligent powder removal unit, so as to obtain filter-pressed coal slime 29 and mixed coal.
The dense medium separation unit comprises dense medium separation equipment F, a clean coal medium removal sieve G, a gangue medium removal sieve H, a classifying screen I, a centrifugal machine J and a medium recovery system K;
the heavy medium separation equipment F is used for separating the oversize material 9 of the desliming sieve to obtain a light product 10 of the heavy medium separation equipment and a heavy product 11 of the heavy medium separation equipment; the light product 10 of the heavy medium separation equipment is sent into a clean coal medium removal sieve G to obtain a clean coal medium removal sieve oversize 12 and a clean coal medium 13 below the clean coal medium removal sieve, the clean coal medium removal sieve oversize 12 flows through a classifying screen I to obtain lump clean coal 16 and clean coal 17, and the clean coal 17 flows through a centrifuge J to obtain a fine clean coal 18 and a centrifugate 19 of a clean coal centrifuge;
the heavy product 11 of the heavy medium separation equipment is sent into a gangue demeshing screen H for obtaining gangue 14 and medium 15 under the gangue demeshing screen; the medium recovery system K is used for mixing and processing the medium 15 under the gangue medium removal sieve, the medium 13 under the clean coal medium removal sieve and the centrifugate 19 of the clean coal centrifuge, obtaining qualified medium 30 and then injecting the qualified medium 30 into the heavy medium separation equipment F to realize separation operation.
The slime water treatment unit comprises a slime water bucket E, a slurry pump R, a classification cyclone L, an arc screen M, a slime centrifuge N, a thickener O, a filter press P, a circulating water pool Q and a pump S;
the coal slime bucket E is used for conveying undersize water 8 of a desliming sieve to a classifying cyclone L through a slurry pump R for classifying treatment, obtaining classifying cyclone overflow 20 and classifying cyclone underflow 21, and conveying the classifying cyclone underflow 21 to an arc sieve M for dewatering treatment, and obtaining arc sieve undersize water 22 and arc sieve oversize 23; the oversize 23 of the arc screen is sent into a slime centrifugal machine N for dehydration treatment, and a slime centrifugal liquid 24 and coarse slime 25 of the slime centrifugal machine are obtained; mixing the classified cyclone overflow 20, the arc screen undersize 22 and the coal slime centrifugal machine centrifugate 24 through a thickener O to obtain thickener overflow 26 and thickener underflow 27, and sending the thickener underflow 27 into a filter press P to obtain filter press filtrate 28 and filter press coal slime 29; the obtained coarse slime 25, the fine coal 18, the undersize 4 of the relaxation sieve and the undersize 6 of the cross sieve are mixed and treated to obtain mixed coal.
The circulating water pool Q is used for mixing the thickener overflow 26 and the filter press filtrate 28 to obtain a mixed product, and the mixed product is respectively sent to the desliming sieve D, the clean coal desliming sieve G and the gangue desliming sieve H through the pump S.
Referring to fig. 1, the intelligent coal powder removal washing method disclosed by the invention comprises the following steps:
The oversize 5 of the relaxation sieve and the oversize 7 of the cross sieve are fed into a desliming sieve D to obtain undersize 8 of the desliming sieve and oversize 9 of the desliming sieve, and the oversize 9 of the desliming sieve is separated by a heavy medium separation device F to obtain a light product 10 of the heavy medium separation device and a heavy product 11 of the heavy medium separation device. The light product 10 of the heavy medium separation equipment is subjected to medium removal through a clean coal medium removal sieve G to obtain a clean coal medium removal sieve oversize product 12 and a clean coal medium removal sieve undersize material 13, the clean coal medium removal sieve oversize product 12 is classified through a classifying screen I to obtain clean coal 16 with the size of more than 30mm and clean coal 17 with the size of less than 30mm, and the clean coal 17 with the size of less than 30mm is further dehydrated through a centrifuge J to obtain clean coal 18 and a centrifugate 19 of a clean coal centrifuge. And (3) passing the heavy product 11 of the heavy medium separation equipment after the heavy medium separation equipment F is separated through a gangue removing medium screen H to obtain gangue 14 and a medium 15 under the gangue removing medium screen. The material 13 under the clean coal medium removing sieve obtained by the clean coal medium removing sieve G, the medium 15 under the clean coal medium removing sieve obtained by the waste rock medium removing sieve H and the centrifugate 19 of the clean coal centrifuge obtained by the centrifuge J enter a medium recycling system K, and the treated material returns to the heavy medium sorting equipment F for recycling.
The undersize water 8 of the desliming sieve enters a slime water bucket E and is sent to a classifying cyclone L through a slurry pump R to be classified to obtain a classifying cyclone overflow 20 and a classifying cyclone underflow 21. The coarse fraction is mainly in the classifying cyclone underflow 21 of the classifying cyclone L, the classifying cyclone underflow 21 is subjected to preliminary dehydration through a curved screen M to obtain curved screen undersize water 22 and curved screen oversize 23, and the curved screen oversize 23 enters a slime centrifuge N for further dehydration to obtain slime centrifuge centrifugate 24 and coarse slime 25. The coarse coal slime 25 is mixed with the undersize 4 of the relaxation screen B or the cross screen C, the undersize 6 of the cross screen, and the dehydrated fine coal 18 of the fine coal centrifuge J as a mixed coal product. The classifying cyclone overflow 20 of the classifying cyclone L contains more fine-particle-grade coal slime, and the classifying cyclone overflow 20 and the under-sieve water 22 of the arc sieve M and the centrifugal liquid 24 of the coal slime centrifugal machine N enter the thickener O together. The slime particles are settled in the thickener O to obtain thickener overflow 26 and thickener underflow 27, and the thickener underflow 27 is subjected to filter pressing by a filter press P to obtain filter press filtrate 28 and filter press slime 29. The filter press filtrate 28 and the thickener overflow 26 of the thickener O enter a circulating water tank Q together, and circulating water is fed into a desliming screen D, a clean coal medium removal screen G and a gangue medium removal screen H through a pump S and is recycled as washing water without discharging.
The mesh size of the relaxation sieve B is between 13 and 25mm, and the mesh size of the cross sieve C is between 3 and 13mm.
The heavy medium sorting equipment is shallow slot sorting machine, inclined wheel sorting machine, vertical wheel heavy medium sorting machine or heavy medium cyclone separating equipment.
The medium recovery system K comprises a medium purifying and recycling system for links such as medium combining and splitting, medium thinning and magnetic separation and the like.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. An intelligent coal powder-removing washing and selecting system is characterized by comprising an intelligent raw coal powder-removing unit, a heavy medium sorting unit and a slime water treatment unit;
the raw coal intelligent powder removing unit comprises a scraping plate (A), a relaxation sieve (B), a cross sieve (C) and a desliming sieve (D); raw coal (1) to be treated flows through a scraper (A) to obtain relaxation sieve raw coal (2) and cross sieve raw coal (3), and the relaxation sieve raw coal (2) flows through a relaxation sieve (B) to obtain a screen lower object (4) of the relaxation sieve and a screen upper object (5) of the relaxation sieve; the raw coal (3) of the cross screen flows through the cross screen (C) to obtain undersize (6) of the cross screen and oversize (7) of the cross screen; the oversize products (5) of the relaxation sieve and the oversize products (7) of the cross sieve flow into the desliming sieve (D) to be separated to obtain undersize water (8) of the desliming sieve and oversize products (9) of the desliming sieve;
the mesh distance of the relaxation sieve (B) is 13-25mm; the mesh distance of the cross screen (C) is 3-13mm; when the moisture of the raw coal (1) is more than 10% or the heating value of the raw coal (1) is lower than 4500kcal/kg, the raw coal (1) enters a cross screen (3) for screening; when the moisture of the raw coal (1) is less than or equal to 10 percent or the heating capacity of the raw coal (1) is higher than 4500kcal/kg, the raw coal (1) enters a relaxation sieve (2) for sieving;
the heavy medium separation unit is used for treating the oversize material (9) of the desliming screen obtained by the raw coal intelligent desliming unit to obtain gangue (14) and lump clean coal (16);
the coal slime water treatment unit is used for treating undersize (4) of the relaxation screen, undersize (6) of the cross screen, undersize (8) of the desliming screen and oversize (9) of the desliming screen, which are obtained by the raw coal intelligent powder removal unit, so as to obtain filter-pressed coal slime (29) and mixed coal.
2. The intelligent coal de-dusting washing system of claim 1 wherein the dense medium separation unit comprises dense medium separation equipment (F), a clean coal de-mediating screen (G), a gangue de-mediating screen (H), a classifying screen (I), a centrifuge (J) and a medium recovery system (K);
the heavy medium separation equipment (F) is used for separating the oversize product (9) of the desliming sieve to obtain a light product (10) of the heavy medium separation equipment and a heavy product (11) of the heavy medium separation equipment; the light product (10) of the heavy medium separation equipment is sent into a clean coal medium removal sieve (G) to obtain clean coal medium removal sieve oversize products (12) and clean coal medium removal sieve undersize media (13), the clean coal medium removal sieve oversize products (12) flow through a classifying screen (I) to obtain lump clean coal (16) and clean coal (17), and the clean coal (17) flows through a centrifuge (J) to obtain dust clean coal (18) and a centrifugal liquid (19) of a clean coal centrifuge;
the heavy product (11) of the heavy medium separation equipment is sent into a gangue removing medium screen (H) for obtaining gangue (14) and medium (15) under the gangue removing medium screen; the medium recovery system (K) is used for mixing and processing the medium (15) under the gangue medium removal sieve, the medium (13) under the clean coal medium removal sieve and the centrifugate (19) of the clean coal centrifuge, obtaining qualified medium (30) and then injecting the qualified medium into the heavy medium separation equipment (F) to realize separation operation.
3. The intelligent coal de-dusting washing system of claim 2 wherein the dense media sorting apparatus (F) is a shallow slot sorter, a skewed wheel sorter, a vertical wheel dense media sorter, or a dense media cyclone.
4. The intelligent coal de-dusting washing system of claim 2 wherein the media recovery system (K) comprises a media purification recovery system of combined media split stream and dilute media magnetic separation.
5. The intelligent coal de-dusting washing system of claim 2 wherein the slime water treatment unit comprises a slime water bucket (E), a slurry pump (R), a classifying cyclone (L), an arc screen (M), a slime centrifuge (N), a thickener (O) and a filter press (P);
the coal slime bucket (E) is used for conveying undersize water (8) of a desliming sieve to the classifying cyclone (L) through the slurry pump (R) for classifying treatment to obtain classifying cyclone overflow (20) and classifying cyclone underflow (21), and the classifying cyclone underflow (21) is conveyed to the arc-shaped sieve (M) for dewatering treatment to obtain undersize water (22) of the arc-shaped sieve and screen oversize products (23) of the arc-shaped sieve; the oversize material (23) of the arc screen is sent into a slime centrifugal machine (N) for dehydration treatment, and a slime centrifugal machine centrifugate (24) and coarse slime (25) are obtained; mixing the classified cyclone overflow (20), the arc screen undersize water (22) and the coal slime centrifugal machine centrifugate (24) through a thickener (O) to obtain thickener overflow (26) and thickener underflow (27), and sending the thickener underflow (27) into a filter press (P) to obtain filter press filtrate (28) and filter press coal slime (29);
and mixing the obtained coarse slime (25), the fine coal (18), the undersize (4) of the relaxation sieve and the undersize (6) of the cross sieve to obtain the mixed coal.
6. The intelligent coal de-dusting washing system of claim 5 wherein the slime water treatment unit further comprises a circulating water tank (Q) and a pump (S);
the circulating water tank (Q) is used for mixing the overflow (26) of the thickener and the filter press filtrate (28) to obtain a mixed product, and the mixed product is respectively sent to the desliming screen (D), the clean coal desliming screen (G) and the gangue desliming screen (H) through the pump (S).
7. A method of using the intelligent coal de-dusting and washing system of any of claims 1-6, comprising the steps of:
s1, feeding raw coal (1) into a scraper (A) of an intelligent raw coal powder removing unit, according to the difference of heating value and moisture of the raw coal (1), processing the raw coal (1) in the scraper (A) to obtain a relaxation sieve raw coal (2) and a cross sieve raw coal (3), feeding the relaxation sieve raw coal (2) into a relaxation sieve (B) to carry out powder removing processing to obtain a relaxation sieve undersize (4) and a relaxation sieve oversize (5), feeding the cross sieve raw coal (3) into a cross sieve (C) to carry out powder removing processing to obtain a cross sieve undersize (6) and a cross sieve oversize (7), and feeding the relaxation sieve oversize (5) and the cross sieve oversize (7) into a desliming sieve (D) to obtain a desliming sieve undersize (8) and a desliming sieve oversize (9);
when the moisture of the raw coal (1) is more than 10% or the heating value of the raw coal (1) is lower than 4500kcal/kg, the raw coal (1) enters a cross screen (3) for screening; when the moisture of the raw coal (1) is less than or equal to 10 percent or the heating capacity of the raw coal (1) is higher than 4500kcal/kg, the raw coal (1) enters a relaxation sieve (2) for sieving;
s2, sorting the oversize products (9) of the desliming sieve to obtain gangue (14) and lump clean coal (16); classifying, arc-shaped screening, centrifuging, concentrating and filter pressing the undersize water (8) of the desliming screen to obtain filter-pressed coal slime (29); the method comprises the steps of combining an undersize (4) of a relaxation sieve, an undersize (6) of a cross sieve, undersize water (8) of a desliming sieve and an oversize (9) of the desliming sieve to obtain mixed coal.
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