CN113560033A - Intelligent coal powder-removing washing system and method - Google Patents
Intelligent coal powder-removing washing system and method Download PDFInfo
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- CN113560033A CN113560033A CN202110814450.4A CN202110814450A CN113560033A CN 113560033 A CN113560033 A CN 113560033A CN 202110814450 A CN202110814450 A CN 202110814450A CN 113560033 A CN113560033 A CN 113560033A
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Abstract
The invention discloses an intelligent coal fines removal washing system and method, and belongs to the field of coal separation. Raw coal is fed into a scraper A for screening, materials are distributed to a relaxation screen B or a cross screen C for screening according to different calorific values or moisture of the raw coal, the materials on the screens are separated through a dense medium separation unit after being deslimed, the materials are dewatered through a medium-removing screen, a grading screen and a centrifugal machine to obtain lump clean coal, fine clean coal and gangue, and the slime water generated in the separation process is subjected to links of grading, concentration, dewatering 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 clean coal to obtain a coal mixing product, and returning the circulating water to the system for recycling. The washing system can select different powder removing devices according to different calorific values and moisture of raw coal, realizes the washing of the coal after powder removing, improves the calorific value of the coal, is practical and effective, and has a better application prospect in the field of coal separation.
Description
Technical Field
The invention belongs to the field of coal technology and coal equipment, and relates to an intelligent coal de-powdering and washing system and an intelligent coal de-powdering and washing method.
Background
The calorific value is a main index of grade division and pricing of the power coal, and the power coal with lower calorific value needs to be washed and selected to achieve the purpose of quality improvement. At present, the main part of the power coal washing is the powder removal and washing, so that the coal slime entering a washing system can be reduced, the pressure of a coal slime water treatment link is reduced, and the condition that the calorific value is not increased due to ash water balance caused by the fact that ash content is reduced and water content is increased after the last coal washing is avoided. In addition, the size of the sieve pores needs to be changed according to the coal quality change of the raw coal in the powder removing link, when the calorific value of the raw coal is reduced, the sieve pores of the powder removing sieve need to be reduced, and the washing amount is increased so that the calorific value of a product meets the requirement; on the contrary, when the calorific value of the raw coal is high, the screen holes of the dust removing screen need to be enlarged. In conclusion, the powder removal link before the power coal is washed becomes a key link of the whole washing and dressing system.
The flip-flow screen and the cross screen are mainly used for a powder removal link, the flip-flow screen is mainly used for screening more than 13mm, when the moisture of raw coal is less than 10%, the screening efficiency is higher, and the flip-flow screen adopts a polyurethane screen plate, so that the replacement and the assembly are convenient, and the size of a screen hole is convenient to adjust. However, when the mesh size is less than 13mm or the moisture content of the raw coal is more than 10%, the phenomenon of mesh pasting is easily caused by the powder removal by the relaxation sieve, and the sieving efficiency is obviously reduced.
The cross screen is newly developed screening equipment in recent years, and is particularly suitable for screening fine-grained wet materials by forcibly screening the materials by rotating a plurality of groups of high-strength wear-resistant metal sheets to avoid the phenomenon of blocking screen holes. However, the screen piece spacing of the cross screen is fixed, the screen hole size is not convenient to adjust, and the condition of coal quality fluctuation 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 fines removal washing system and method, aiming at solving the problems that the sieve pore pasting phenomenon is easily caused by using a relaxation sieve for fines removal in the prior art, and the sieving efficiency is obviously reduced; the screen piece space of the cross screen is fixed, the size of the screen hole is not convenient to adjust, and the defect technical problem of coal quality fluctuation condition is difficult to adapt to.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention provides an intelligent coal de-powdering and washing system which comprises a raw coal intelligent de-powdering unit, a dense medium sorting unit and a coal slime water treatment unit;
the intelligent raw coal powder removing unit comprises a scraper, a relaxation sieve, a cross sieve and a desliming sieve; raw coal to be treated flows through a scraper to obtain tension and relaxation sieve raw coal and cross sieve raw coal, and the tension and relaxation sieve raw coal flows through a tension and relaxation sieve to obtain undersize of the tension and oversize of the tension and relaxation sieve; raw coal flows through the cross screen to obtain undersize products and oversize products of the cross screen; enabling oversize materials of the relaxation sieve and oversize materials of the cross sieve to flow into the desliming sieve for separation to obtain undersize water of the desliming sieve and oversize materials of the desliming sieve;
the dense medium sorting unit is used for processing oversize products of the desliming sieve obtained by the intelligent raw coal powder removing unit to obtain gangue and lump clean coal;
the coal slime water processing unit is used for processing the undersize of the relaxation sieve, the undersize of the cross sieve, the undersize of the desliming sieve and the oversize of the desliming sieve which are obtained by the intelligent raw coal powder removing unit to obtain filter-pressing coal slime and mixed coal.
Preferably, the mesh distance of the relaxation screen is 13-25 mm.
Preferably, the cross screen has a mesh distance of 3-13 mm.
Preferably, the dense medium sorting unit comprises dense medium sorting equipment, a clean coal medium removing sieve, a gangue medium removing sieve, a grading sieve, a centrifugal machine and a medium recovery system;
the heavy medium separation equipment is used for separating oversize products of the desliming sieve to obtain light products of the heavy medium separation equipment and heavy products of the heavy medium separation equipment; sending a light product of the heavy medium separation equipment into a clean coal medium removing sieve to obtain an oversize product of the clean coal medium removing sieve and a medium under the clean coal medium removing sieve, enabling the oversize product of the clean coal medium removing sieve to flow through a grading sieve to obtain lump clean coal and clean coal, and enabling the clean coal to flow through a centrifuge to obtain fine clean coal and a centrifugate of the clean coal centrifuge;
the heavy product of the heavy medium separation equipment is sent into a gangue medium removing sieve for obtaining gangue and the medium under the gangue medium removing 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 centrifugal liquid of the clean coal centrifugal machine, obtaining qualified medium and then injecting the qualified medium into the dense medium separation equipment to realize separation operation.
Preferably, the dense medium separation equipment is a shallow slot separator, an inclined wheel separator, a vertical wheel dense medium separator or a dense medium cyclone.
Preferably, the medium recovery system comprises a medium purification and recycling system for medium combining and splitting and dilute medium magnetic separation.
Preferably, the slime water treatment unit comprises a slime bucket, a slime pump, a grading cyclone, a sieve bend, a slime centrifuge, a thickener and a filter press;
the coal slime bucket is used for pumping the screened water flow of the desliming screen to a grading cyclone through a slurry pump for grading treatment to obtain the overflow of the grading cyclone and the underflow of the grading cyclone, and the underflow of the grading cyclone is sent to the arc screen for dehydration treatment to obtain the screened water of the arc screen and the screened material of the arc screen; sending oversize products of the sieve bend into a coal slime centrifuge for dehydration treatment to obtain centrifugal liquid and coarse coal slime of the coal slime centrifuge; mixing overflow of a grading cyclone, undersize water of a sieve bend and centrifugal liquid of a coal slime centrifugal machine through a thickener to obtain overflow of the thickener and underflow of the thickener, and sending the underflow of the thickener into a filter press to obtain filtrate of the filter press and filter-pressed coal slime;
and mixing the obtained coarse slime, the obtained fine clean coal, undersize products of the relaxation sieve and undersize products of the cross sieve to obtain mixed coal.
Preferably, the slime water treatment unit also comprises a circulating water tank and a pump;
and the circulating water tank is used for mixing the overflow of the thickener and the filtrate of the filter press to obtain a mixed product, and the mixed product is respectively conveyed 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 fines removal washing system, which comprises the following steps:
s1, feeding raw coal into a scraper of a raw coal intelligent powder removing unit, treating the raw coal in the scraper to obtain relaxation sieve raw coal and cross sieve raw coal according to different heat productivity and moisture of the raw coal, feeding the relaxation sieve raw coal into a relaxation sieve for powder removing treatment to obtain a relaxation sieve undersize and a relaxation sieve oversize, feeding the cross sieve raw coal into a cross sieve for powder removing treatment to obtain a cross sieve undersize and a cross sieve oversize, and feeding the relaxation sieve oversize and the cross sieve oversize into a desliming sieve to obtain desliming sieve undersize and desliming sieve oversize;
s2, sorting oversize products of the desliming screen to obtain gangue and lump clean coal; classifying screen drainage of a desliming screen, carrying out arc screening, centrifuging, concentrating and filter-pressing treatment to obtain filter-pressed coal slime; and combining undersize of the flip-flow screen, undersize of the cross screen, undersize of the desliming screen and oversize of the desliming screen to obtain the mixed coal.
Preferably, when the moisture of the raw coal is more than 10% or the calorific value of the raw coal is lower than 4500kcal/kg, the raw coal enters a cross sieve for sieving; when the moisture of the raw coal is less than or equal to 10 percent or the calorific value of the raw coal is higher than 4500kcal/kg, the raw coal enters a relaxation sieve for sieving.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses an intelligent coal fines removal washing system which comprises a raw coal intelligent fines removal unit, a dense medium separation unit and a coal slime water treatment unit, wherein materials are distributed to a relaxation sieve or a cross sieve for sieving according to the raw coal calorific value and the moisture change of the raw coal intelligent fines removal unit. The scheme can fully exert the advantages of the relaxation sieve and the cross sieve, select the powder removing equipment according to the heat productivity and the moisture change of the raw coal, improve the powder removing efficiency and realize the purpose of improving the quality of the power coal. The coal slime can be reduced from entering a washing system by the powder removal and washing, the pressure of a coal slime water treatment link is reduced, and the condition that the calorific value is not increased due to ash water balance caused by reduction of ash content and increase of water content after the washing of the slack coal is avoided. And the conventional dense medium separation unit and the coal slime water treatment unit are combined to realize the coal de-powdering and washing. Different powder removing devices can be selected according to different calorific values and moisture of raw coal, so that the coal can be washed after being removed from the powder, the calorific value of the coal is 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 enter the relaxation sieve and the cross sieve respectively according to the mesh size and the heat and moisture of the raw coal, so that the powder removal is more thorough.
Furthermore, the shallow slot separator realizes separation according to the floating and sinking principle, and has high separation efficiency; the impact force of the inclined wheel sorting machine on the commodities is small, and sorting is rapid and accurate; the vertical wheel dense medium separator has high separation efficiency and low power consumption; the dense medium cyclone has high separation efficiency and wide separation density adjusting range, and the production process is easy to realize automation.
Further, providing a media recovery system in the dense media sorting unit may reduce waste of material.
Furthermore, a water circulation pool 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 fines removal washing system, different products can be obtained according to the steps of the method, and the method has a good application prospect in the fields of coal processes and coal equipment.
Drawings
FIG. 1 is a flow chart of the intelligent coal fines removal washing process of the present invention;
FIG. 2 is a structural diagram of the intelligent coal dust-removing and washing equipment of the invention.
Wherein, 1-raw coal; 2-flip-flow screening raw coal; 3-cross screening raw coal; 4-undersize of the flip-flow screen; 5-oversize of the flip-flow screen; 6-undersize of cross-sifter; 7-oversize of cross-sifter; 8-screen water of the desliming screen; 9-oversize of the desliming screen; 10-light products of heavy media separation equipment; 11-heavy products of a dense medium separation device; 12-removing the medium and screening oversize materials of the clean coal; 13-medium under the medium screen of the clean coal medium-removing sieve; 14-gangue; 15-medium under the gangue medium removal sieve; 16-piece of clean coal; 17-clean coal; 18-fine clean coal; 19-centrifugating liquid of a clean coal centrifuge; 20-overflow of the classifying cyclone; 21-underflow of classifying cyclone; 22-screening the water by using a curved screen; 23-oversize of the sieve bend; 24-coal slurry centrifuge centrifugate; 25-coarse coal slime; 26-thickener overflow; 27-thickener underflow; 28 filter press filtrate; 29-filter-pressing the coal slime; 30-qualified medium; a-a scraper; b-a flip-flow screen; c-cross screening; d-desliming and screening; e-coal slime bucket; f-dense medium sorting equipment; g-medium removing screening of clean coal; h-gangue medium removal screening; i, a grading sieve; j-centrifuge; a K-media recovery system; an L-staged cyclone; m-arc screen; an N-coal slurry centrifuge; an O-thickener; a P-filter press; q-circulating water pool; r-slurry pump; and (S) a pump.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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 accompanying drawings:
referring to fig. 1 and 2, the invention also discloses an intelligent coal de-powdering and washing system and a method, referring to fig. 2, the intelligent coal de-powdering and washing system comprises an intelligent raw coal de-powdering unit, a heavy medium sorting unit and a coal slime water treatment unit;
the raw coal intelligent powder removing unit comprises a scraper 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; raw coal 3 flows through a cross screen C to obtain undersize 6 of the cross screen and oversize 7 of the cross screen; enabling oversize materials 5 of the relaxation sieve and oversize materials 7 of the cross sieve to flow into a desliming sieve D and separating to obtain screen water 8 of the desliming sieve and oversize materials 9 of the desliming sieve;
the dense medium sorting unit is used for processing oversize products 9 of the desliming sieve obtained by the intelligent raw coal powder removing unit to obtain gangue 14 and lump clean coal 16;
the coal slime water processing unit is used for processing the undersize 4 of the relaxation sieve, the undersize 6 of the cross sieve, the undersize 8 of the desliming sieve and the oversize 9 of the desliming sieve which are obtained by the raw coal intelligent powder removing unit 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 removing sieve G, a gangue medium removing sieve H, a classifying sieve I, a centrifugal machine J and a medium recovery system K;
the heavy medium separation equipment F is used for separating oversize products 9 of the desliming sieve to obtain light products 10 of the heavy medium separation equipment and heavy products 11 of the heavy medium separation equipment; sending a light product 10 of heavy medium separation equipment into a clean coal head medium removing sieve G to obtain an oversize product 12 of the clean coal head medium removing sieve and a medium 13 below the clean coal head medium removing sieve, enabling the oversize product 12 of the clean coal head medium removing sieve to flow through a grading sieve I to obtain lump clean coal 16 and clean coal 17, and enabling the clean coal 17 to flow through a centrifuge J to obtain fine clean coal 18 and a centrifugate 19 of a clean coal centrifuge;
a heavy product 11 of the heavy medium separation equipment is sent into a gangue medium removing sieve H for obtaining gangue 14 and a medium 15 below the gangue medium removing sieve; 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 centrifugal liquid 19 of the clean coal centrifuge to obtain qualified medium 30, and then injecting the qualified medium into the dense medium separation equipment F to realize separation operation.
The coal slime water treatment unit comprises a coal slime bucket E, a slurry pump R, a grading swirler L, a sieve bend M, a coal slime centrifuge N, a thickener O, a filter press P, a circulating water tank Q and a pump S;
the coal slime bucket E is used for conveying the screened water 8 of the desliming screen to the classifying cyclone L through the slurry pump R for classification treatment to obtain an overflow 20 of the classifying cyclone and an underflow 21 of the classifying cyclone, and the underflow 21 of the classifying cyclone is conveyed to the arc screen M for dehydration treatment to obtain an screened water 22 of the arc screen and an oversize 23 of the arc screen; sending oversize products 23 of the sieve bend into a coal slime centrifuge N for dehydration treatment to obtain centrifugal liquid 24 of the coal slime centrifuge and coarse coal slime 25; enabling overflow 20 of the grading cyclone, screened water 22 of the arc screen and centrifugal liquid 24 of the coal slime centrifuge to flow through a thickener O for mixing treatment to obtain overflow 26 of the thickener and underflow 27 of the thickener, and sending the underflow 27 of the thickener into a filter press P to obtain filtrate 28 of the filter press and filter-pressed coal slime 29; and mixing the obtained coarse coal slime 25, the obtained fine clean coal 18, the undersize products 4 of the relaxation sieve and the undersize products 6 of the cross sieve to obtain mixed coal.
And the circulating water tank Q is used for mixing and processing the thickener overflow 26 and the filter press filtrate 28 to obtain a mixed product, and the mixed product is respectively sent to a desliming sieve D, a clean coal medium removing sieve G and a gangue medium removing sieve H through a pump S.
Referring to fig. 1, the invention discloses an intelligent coal fines removal washing method, which comprises the following steps:
Feeding the oversize material 5 of the relaxation sieve and the oversize material 7 of the cross sieve into a desliming sieve D to obtain the undersize material 8 of the desliming sieve and the oversize material 9 of the desliming sieve, and separating the oversize material 9 of the desliming sieve by heavy medium separation equipment F to separate out a light product 10 of the heavy medium separation equipment and a heavy product 11 of the heavy medium separation equipment. Light products 10 of the heavy medium separation equipment are subjected to medium removal through a clean coal medium removal sieve G to obtain clean coal medium removal sieve oversize products 12 and clean coal medium removal sieve undersize products 13, the clean coal medium removal sieve oversize products 12 are classified through a classifying sieve I to obtain clean coal 16 with the size larger than 30mm and clean coal 17 with the size smaller than 30mm, and the clean coal 17 with the size smaller than 30mm is further dehydrated through a centrifuge J to obtain fine clean coal 18 and a centrifugate 19 of a clean coal centrifuge. And (3) removing media from a heavy product 11 of the heavy medium separation equipment after the heavy medium separation equipment F separates the heavy product through a gangue medium removing sieve H to obtain gangue 14 and a medium 15 below the gangue medium removing sieve. And (3) allowing a substance 13 under the clean coal medium removal sieve obtained by the clean coal medium removal sieve G, a medium 15 under the gangue medium removal sieve obtained by the gangue medium removal sieve H and a centrifugate 19 of a clean coal centrifuge obtained by the centrifuge J to enter a medium recovery system K, and returning the treated centrifugate to the heavy medium separation equipment F for recycling.
Screen water 8 of the desliming screen enters a coal slurry bucket E, and is conveyed to a classification swirler L through a slurry pump R for classification to obtain a classification swirler overflow 20 and a classification swirler underflow 21. The underflow 21 of the classifying cyclone L is mainly coarse fraction, the underflow 21 of the classifying cyclone L is primarily dehydrated by a sieve bend M to obtain sieve underflow 22 of the sieve bend and sieve overflow 23 of the sieve bend, and the sieve overflow 23 of the sieve bend enters a coal slime centrifuge N for further dehydration to obtain centrifugal liquid 24 of the coal slime centrifuge and coarse coal slime 25. The coarse coal slime 25 is mixed with undersize 4 of the relaxation sieve B or the cross sieve C, undersize 6 of the cross sieve and the dehydrated final clean coal 18 of the clean coal centrifuge J to be used as a coal mixing product. The overflow 20 of the classification cyclone L contains more fine-grained coal slime, and the overflow 20 of the classification cyclone, the sieve water 22 of the sieve bend M and the centrifugal liquid 24 of the coal slime centrifugal machine N enter the thickener O together. Coal 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 liquor 28 and filter-pressed coal slime 29. Filtrate 28 of the filter press and thickener overflow 26 of the thickener O enter a circulating water pool Q together, and circulating water is fed into a desliming sieve D, a clean coal dielectric sieve G and a gangue dielectric sieve H through a pump S and is recycled as washing water without being discharged outside.
The mesh of the relaxation sieve B is between 13 and 25mm, and the mesh of the cross sieve C is between 3 and 13 mm.
The dense medium sorting equipment is a shallow slot sorting machine, an inclined wheel sorting machine, a vertical wheel dense medium sorting machine or a dense medium cyclone and the like.
The medium recovery system K comprises a medium purification and recovery utilization system in the links of medium combination and shunt, dilute medium magnetic separation and the like.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. An intelligent coal de-powdering and washing system is characterized by comprising a raw coal intelligent de-powdering unit, a dense medium sorting unit and a coal slime water treatment unit;
the intelligent raw coal powder removing unit comprises a scraper (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 undersize (4) and oversize (5) of the relaxation sieve; 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; both oversize materials (5) of the relaxation sieve and oversize materials (7) of the cross sieve flow into the desliming sieve (D) to be separated to obtain screen water (8) of the desliming sieve and oversize materials (9) of the desliming sieve;
the dense medium sorting unit is used for processing oversize products (9) of the desliming sieve obtained by the intelligent raw coal powder removing unit to obtain gangue (14) and lump clean coal (16);
the coal slime water processing unit is used for processing the undersize (4) of the relaxation sieve, the undersize (6) of the cross sieve, the undersize (8) of the desliming sieve and the oversize (9) of the desliming sieve which are obtained by the raw coal intelligent powder removing unit to obtain filter-pressed coal slime (29) and mixed coal.
2. The intelligent coal dust-removing and washing system as claimed in claim 1, wherein the mesh distance of the relaxation screen (B) is 13-25 mm.
3. The intelligent coal dust-removing and washing system as claimed in claim 1, wherein the mesh distance of the cross screen (C) is 3-13 mm.
4. The intelligent coal de-dusting and washing system according to claim 1, wherein the dense medium separation unit comprises a dense medium separation device (F), a clean coal de-media screen (G), a gangue de-media 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 oversize products (9) of the desliming sieve to obtain light products (10) of the heavy medium separation equipment and heavy products (11) of the heavy medium separation equipment; sending a light product (10) of heavy medium separation equipment into a clean coal medium removing sieve (G) to obtain a clean coal medium removing sieve oversize product (12) and a clean coal medium removing sieve undersize medium (13), enabling the clean coal medium removing sieve oversize product (12) to flow through a grading sieve (I) to obtain lump clean coal (16) and clean coal (17), and enabling the clean coal (17) to flow through a centrifuge (J) to obtain fine clean coal (18) and a centrifugate (19) of the clean coal centrifuge;
a heavy product (11) of the heavy medium separation equipment is sent into a gangue medium removing sieve (H) and is used for obtaining gangue (14) and a medium (15) below the gangue medium removing sieve; the medium recovery system (K) is used for mixing and processing a medium (15) below a gangue medium removal sieve, a medium (13) below a clean coal medium removal sieve and a centrifugal liquid (19) of a clean coal centrifugal machine, and obtaining a qualified medium (30) to be injected into the dense medium separation equipment (F) to realize separation operation.
5. The intelligent coal de-dusting and washing system according to claim 4, wherein the dense medium separation equipment (F) is a shallow slot separator, an inclined wheel separator, a vertical wheel dense medium separator or a dense medium cyclone.
6. The intelligent coal dust-removing and washing system as claimed in claim 4, wherein the medium recovery system (K) comprises a medium purification and recycling system of medium-combining flow separation and dilute medium magnetic separation.
7. The intelligent coal de-powdering and washing system according to claim 4, wherein the coal slime water treatment unit comprises a coal slime bucket (E), a slurry pump (R), a grading cyclone (L), a sieve bend (M), a coal slime centrifuge (N), a thickener (O) and a filter press (P);
the coal slime bucket (E) is used for conveying the screen underflow (8) of the desliming screen to the grading cyclone (L) through the slurry pump (R) for grading treatment to obtain a grading cyclone overflow (20) and a grading cyclone underflow (21), the grading cyclone underflow (21) is conveyed to the arc screen (M) for dewatering treatment to obtain an arc screen underflow (22) and an arc screen oversize (23); sending oversize products (23) of the sieve bend into a coal slime centrifuge (N) for dehydration treatment to obtain centrifugal liquid (24) of the coal slime centrifuge and coarse coal slime (25); enabling overflow (20) of the grading cyclone, screen underflow (22) of the sieve bend and centrifugal liquid (24) of the coal slime centrifuge to flow through a thickener (O) for mixing treatment to obtain overflow (26) and underflow (27) of the thickener, and sending the underflow (27) of the thickener into a filter press (P) to obtain filtrate (28) of the filter press and filter-pressed coal slime (29);
and mixing the obtained coarse coal slime (25), the obtained fine clean coal (18), the undersize (4) of the relaxation sieve and the undersize (6) of the cross sieve to obtain mixed coal.
8. The intelligent coal de-dusting and washing system of claim 7, wherein the coal slurry water treatment unit further comprises a circulating water tank (Q) and a pump (S);
and the circulating water tank (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 conveyed to the desliming sieve (D), the clean coal medium removing sieve (G) and the gangue medium removing sieve (H) through the pump (S).
9. The method for adopting the intelligent coal dust-removing and washing system as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
s1, feeding raw coal (1) into a scraper (A) of a raw coal intelligent powder removing unit, treating the raw coal (1) in the scraper (A) according to different heat productivity and moisture of the raw coal (1) to obtain relaxation sieve raw coal (2) and cross sieve raw coal (3), feeding the relaxation sieve raw coal (2) into a relaxation sieve (B) for powder removing treatment to obtain relaxation sieve undersize (4) and relaxation sieve oversize (5), feeding the cross sieve raw coal (3) into a cross sieve (C) for powder removing treatment to obtain cross sieve undersize (6) and cross sieve oversize (7), and feeding the relaxation sieve oversize (5) and cross sieve oversize (7) into a desliming sieve (D) to obtain desliming sieve undersize (8) and desliming sieve oversize (9);
s2, sorting oversize products (9) of the desliming screen to obtain gangue (14) and lump clean coal (16); classifying screen drainage (8) of the desliming screen, carrying out arc screening, centrifuging, concentrating and filter-pressing treatment to obtain filter-pressed coal slime (29); and combining undersize (4) of the flip-flow screen, undersize (6) of the cross screen, undersize (8) of the desliming screen and oversize (9) of the desliming screen to obtain the mixed coal.
10. The intelligent coal fines removal washing method of claim 9, characterized in that when the moisture of the raw coal (1) is more than 10% or the calorific value of the raw coal (1) is lower than 4500kcal/kg, the raw coal (1) enters the cross screen (3) for screening; when the moisture of the raw coal (1) is less than or equal to 10 percent or the calorific value of the raw coal (1) is higher than 4500kcal/kg, the raw coal (1) enters a relaxation sieve (2) for sieving.
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