CN105964392A - Coal dressing and desliming system - Google Patents
Coal dressing and desliming system Download PDFInfo
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- CN105964392A CN105964392A CN201610444061.6A CN201610444061A CN105964392A CN 105964392 A CN105964392 A CN 105964392A CN 201610444061 A CN201610444061 A CN 201610444061A CN 105964392 A CN105964392 A CN 105964392A
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- coal
- desliming
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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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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Abstract
The invention provides a coal dressing and desliming system. The coal dressing and desliming system comprises a raw coal classifying screen, a crushing device, a desliming screen, a heavy medium shallow groove sorting machine, a coal slime barrel, a hydrocyclone, a thickener, an arc screen, a filtering machine and a coal slime centrifugal machine. According to the coal dressing and desliming system, the size of a screen plate of the desliming screen is changed into 3 mm from 6 mm, gangue which is 3 mm-6 mm in size and cannot be discharged due to unavailable washing of raw coal in the original design is effectively treated and discharged, accordingly, the ash content of obtained the powdery cleaned coal is reduced to be lower than 6 wt%, the quality and the level of the powdery cleaned coal are improved, the powdery cleaned coal with the extremely low ash content is obtained, the selling price of products is greatly increased, and economic benefits are effectively increased. Meanwhile, high-power equipment including six arc screens, three centrifugal machines, one first sealing tape machine, one scraper conveyor and one second sealing tape machine can be omitted, the power consumption is reduced, meanwhile, investment on the equipment is reduced, and cost is greatly reduced.
Description
Technical field
The invention belongs to field, colliery, particularly to a kind of coal separation desliming system.
Background technology
China is coal production state maximum in the world and country of consumption, by the ring caused by coal utilization
Border problem is more and more prominent, and such as the vocabulary such as haze, PM2.5 and pellet is frequent
Being seen in space in a newspaper, mainly under conditions of mining mechanization degree is the highest, raw coal quality is more
It is the poorest to come, the increase of suspended particulate substance row coal-fired with coal-burning power plant and iron and steel, cement etc. in air
Flue dust and gas that industry produces have greatest association.In order to effectively utilize coal resources, reduce fire coal
Pollution to environment, it is necessary to carry out clean coal technology.The source of clean coal technology is exactly coal washing,
The spoil in raw coal can be removed, it is possible to the inorganic sulfur of removing 50-80wt% is with big by coal washing
The ash of part.
Coal preparation plant's big well system of prior art uses and takes off as the system of Fig. 1,2 carries out washing to raw coal
Mud, this system includes raw coal sizing screen 1, for raw coal is carried out 13mm classification；Crush and set
Standby 2, for preferable at raw coal quality, when can directly reach marketable coal standard, will be from described raw coal
The material more than 13mm of classifying screen 1 carries out broken obtaining lump coal, sells as marketable coal；
Desliming screen 3, for carrying out 6mm from the material more than 13mm of described raw coal sizing screen 1
Desliming is sieved；Dense-medium shallow-tank separator 4, for receive from described desliming screen 3 on-the-sieve material also
It is sorted, to obtain shallow slot cleaned coal (granularity is as 25-200mm)；Second sieve bend 11 (6
Platform), and from the undersize material of described desliming screen 3 it is sieved for reception；Centrifuge 12
(6), and are dehydrated from the on-the-sieve material of described second sieve bend 11 it for reception,
Obtain coarse slime (particle diameter is at 0.5-3mm)；Coal slime bucket 5, for receiving from described second arc
The undersize material of sieve 11 and from the centrifugal liquid of described centrifuge 12；Hydrocyclone 6, is used for connecing
Receive the material from described coal slime bucket 5, and it is carried out hydraulic classiciation, obtain overflow material and the end
Stream material；Thickener 7, and enters from the overflow material of described hydrocyclone 6 it for reception
Row dehydration；Sieve bend 9 (sieve plate is 0.35mm sieve plate), for receiving from described hydraulic cyclone
It is also dehydrated by the underflow materials of device 6；Filter 8, for receiving from described thickener 7
Concentration material, and to its further dehydration, obtain fine coal slurry (particle diameter is less than 0.5mm)；Coal slime
Centrifuge 10, for receiving the on-the-sieve material from described sieve bend 9, and to its further dehydration,
Obtain coarse slime (particle diameter is at 0.5-3mm)；First sealing-tape machine 13, scrapper conveyor 14 and the second adhesive tape
Machine 15, for exporting the coarse slime from centrifuge 12 to storehouse sealing-tape machine on mixed coal successively, (this mixes
On coal, storehouse sealing-tape machine is storehouse sealing-tape machine on the mixed coal of big well system) then input product storehouse transport outward
Sell, for outlet or coal blending at power plant；Defeated through other routes from the coarse slime of coal slime centrifuge 10
Go out storehouse sealing-tape machine to the mixed coal of another system (well system of such as, living)；Wherein, desliming screen 3
Sieve plate be 6mm sieve plate；Washing desliming process is: after raw coal 13mm classification, more than 13mm
Raw coal obtain by entering dense-medium shallow-tank separator (4) sorting after the 6mm desliming of desliming screen 3
Shallow slot cleaned coal, the coarse slime less than 6mm is successively through 6 1.5mm the second sieve bends 11 and 3
Platform 0.5mm centrifuge 12 is dehydrated, and obtains coarse slime；From the coarse slime of centrifuge 12 through
Storehouse sealing-tape machine on input mixed coal reprinted by one sealing-tape machine 13, scrapper conveyor 14 and the second sealing-tape machine 15；Little
In 1.5mm sieve bend 9 undersize material and less than 0.5mm centrifuge 12 centrifugal liquid then
It flow to coal slime bucket 5, then sub-elected after coarse slime successively through sieve bend 9 by hydrocyclone 6
After being dehydrated with coal slime centrifuge 10 (use two kinds of equipment to be dehydrated, be to strengthen dehydrating effect,
It addition, the feed thickness of coal slime centrifuge has regulation, material concentration to reach the standard of regulation
Scope ability pan feeding, it is therefore desirable to sieve bend carries out preliminary hydro-extraction to material, makes material concentration reach
Coal slime centrifuge feed thickness, then could be dehydrated with coal slime centrifuge.), it is centrifuged from coal slime
The coarse slime of machine 10 reprints input through the first sealing-tape machine 13, scrapper conveyor 14 and the second sealing-tape machine 15
Storehouse sealing-tape machine on mixed coal；The most concentrated machine 7 He after sub-electing fine coal slurry by hydrocyclone 6
After filter 8 dehydration, the fine coal slurry from filter 8 directly inputs storehouse adhesive tape on another mixed coal
Machine.This kind of desliming system, enters under the mode of production washed entirely in coal preparation plant, the slime content of 1.5-6mm
Less, but a small amount of coal slime of this part to pass through 6 the second sieve bend 11,3 desk centrifuges 12,1
13,1 scrapper conveyor 14 of platform the first sealing-tape machine and 1 second these powerful device of sealing-tape machine 15
Storehouse in reprinting, causes huge electricity waste.
Summary of the invention
It is an object of the invention to provide a kind of coal separation desliming system, this coal separation desliming system can be
Washing process saves 6 the second sieve bends that aforementioned background art mentions, 3 desk centrifuges, 1
The use of the multiple stage main equipments such as the first sealing-tape machine, 1 scrapper conveyor and 1 the second sealing-tape machine, and then
Save electricity, promote the quality of marketable coal simultaneously, increase economic efficiency.
Technical scheme is as follows:
A kind of coal separation desliming system, including:
Raw coal sizing screen: for raw coal is carried out 13mm classification；
At least one desliming screen: for by the material more than 13mm from described raw coal sizing screen
Carrying out desliming screening, the sieve plate of described desliming screen is 3mm sieve plate；
Dense-medium shallow-tank separator: for receiving the on-the-sieve material from described desliming screen；
Coal slime bucket: for receiving the undersize material from described desliming screen；
Hydrocyclone: for receiving from the material of described coal slime bucket, and it is carried out waterpower divide
Level；
Thickener: from the overflow material of described hydrocyclone and it is dehydrated for reception；
Sieve bend: from the underflow materials of described hydrocyclone and it is dehydrated for receiving；
Filter: for receiving the concentration material from described thickener, and to its further dehydration；
Coal slime centrifuge: for receiving the on-the-sieve material from described sieve bend and further to it
Dehydration；
Described thickener is additionally operable to receive from described filter and the filtrate of described coal slime centrifuge,
And the undersize material from described sieve bend.
Preferably, described coal separation desliming system also includes the second sieve bend, and described second sieve bend is not
Mounted sieve, and its on-the-sieve material exit is provided with closure baffle plate, for will be from described desliming
The undersize material of sieve is all in the undersize material outlet described coal slime bucket of input of described second sieve bend.
Preferably, described closure baffle plate is iron plate.
Preferably, described desliming screen is provided with at least 10 shower nozzles, further preferred 18.
Preferably, the water spraying direction of described shower nozzle exists with the on-the-sieve material from described raw coal sizing screen
Flow direction on the compass screen surface of described desliming screen is at an angle of α, 90 °≤α≤150 °；Further preferably
α=120 °.
Compass screen surface refers to sieve plate plane.
Preferably, the upper upspout road controlling opening of valve of described dense-medium shallow-tank separator is 1/3.
In the course of the work, valve opening herein is 1/3 always.
Preferably, a diameter of 75-90mm of underflow mouth of described hydrocyclone, further preferred 80
mm。
A kind of method utilizing above-mentioned coal separation desliming system to carry out coal separation, comprises the following steps:
Raw coal is carried out 13mm classification by described raw coal sizing screen, obtains on-the-sieve material and undersize material；
Described desliming screen receives the on-the-sieve material from described raw coal sizing screen, and it is carried out desliming
Screening, obtains on-the-sieve material and undersize material；
Dense-medium shallow-tank separator receives the on-the-sieve material from described desliming screen, and sorts it
To obtain cleaned coal；
Described coal slime bucket receives the undersize material from described desliming screen；
Described hydrocyclone receives the material from described coal slime bucket, and it is carried out hydraulic classiciation,
Obtain overflow material and underflow materials；
Described thickener receives the overflow material from described hydrocyclone, and is dehydrated it,
Obtain concentrating material；
Described sieve bend receives the underflow materials from described hydrocyclone, and is dehydrated it,
Obtain on-the-sieve material；
Described filter receives the concentration material from described thickener, and to its further dehydration,
Obtain fine coal slurry；
Described coal slime centrifuge receives the on-the-sieve material from described sieve bend, and takes off it further
Water, obtains coarse slime；
Described thickener also receives from described filter and the filtrate of described coal slime centrifuge, and
From the undersize material of described sieve bend, and it is dehydrated.
The beneficial effects of the present invention is:
(1) the coal separation desliming system of the present invention, by being changed desliming screen window screen size into 3 by 6mm
Mm, by original design due to raw coal cannot washing and cause the spoil of the 3-6mm that cannot discharge to enter
Go and effectively processed and discharge, and then made the ash of the coarse slime obtained be reduced to below 6wt%,
Its time is mixed fine cleaned coal (fine cleaned coal is that smalls sorts the product that obtains, in process of production,
Coarse slime must export through the transport production line of fine cleaned coal, and therefore coarse slime inherently returns and mixes end essence
In coal) in during, reduce the pollution to fine cleaned coal, compared with original system, improve back
Mixing quality and the grade of rear fine cleaned coal, obtain the fine cleaned coal of special low ash, product price improves a lot,
It is effectively increased economic benefit；Meanwhile, can save 6 the second sieve bends, 3 desk centrifuges, 1
First sealing-tape machine, 1 scrapper conveyor and 1 these powerful device of the second sealing-tape machine, not only save
Power consumption, decreases the investment to equipment simultaneously, significantly reduces cost；
(2) the coal separation desliming system of the present invention, it is also possible to include the second sieve bend, be now in order to
Make full use of existing resource and facilitate the consideration of comb, being not required to remove second on the basis of intrinsic
Sieve bend, but the second sieve bend no power, not mounted sieve, and by its on-the-sieve material outlet envelope
It is stifled, so that the undersize material of desliming screen is all through the undersize material outlet input of described second sieve bend
In described coal slime bucket, the second sieve bend now the most only plays the effect of chute, so, former
Improve on the basis of design, just eliminate dismounting main equipment and pipeline and rearrange pipeline
With the trouble of chute, take full advantage of existing resource, save time, manpower and equipment investment,
Also save power consumption simultaneously；
(3) desliming screen arranges 18 shower nozzles, original design many 8 of ratio, the setting of more shower nozzle, increases
The big injection flow rate of desliming screen, improves the desliming efficiency of desliming screen；
(4) found by test, the water spraying direction when shower nozzle and the oversize from raw coal sizing screen
Material flow direction angulation α on the compass screen surface of desliming screen is in the range of 90 °-150 °, especially
It is when 120 °, the rolling of little sized coal grain can be effectively resulted in, thus reach optimal desliming
Effect；
(5) the outspoken footpath of hydrocyclone underflow is in the range of 75-90mm, especially during 80mm,
While can ensureing that the effluent concentration of hydrocyclone and solids content are within normal range, prevent the end
Stem bar blocks, it is ensured that operating condition is normal；Compared with original system, the desliming screen sieve plate chi of the application
Very little diminish, and desliming screen siftage is no longer pass through the second sieve bend and centrifuge 0.35mm divides
Level, say, that this link enters the material particles of hydrocyclone from original 0.35 through coal slime bucket
Mm becomes 3mm, and the granularity of granule becomes big, measures simultaneously and also becomes big, so can be to former system
The sorting situation (including the effluent concentration of hydrocyclone) that system sets impacts, therefore to
Ensure the concentration of the overflow of hydrocyclone, need to adjust the diameter (underflow in original system of underflow mouth
The a diameter of 75mm of mouth)；And the outspoken footpath of underflow increases, the concentration of overflow and solids content can be caused to increase
Greatly, the concentration of underflow and solids content reduce, and therefore adjust the outspoken footpath of underflow and can ensure hydraulic cyclone
The effluent concentration of device and solids content；
(6), after diminishing due to desliming screen window screen size, the granularity of the coal of dense-medium shallow-tank separator is entered
Composition change, small particles material increases, and causes suspension (to be configured to by dense media microgranule and water
The two-phase fluid of suspended state) in dense media microgranule (such as magnetic iron powder) be subject in water buoyancy,
Gravity and external force all there occurs change, thus the steady statue of suspension can be caused to change, by
Stable become unstable, by desliming screen shower nozzle and compass screen surface angle, upper up-flow control valve opening with
And the adjustment in the outspoken footpath of underflow etc. of hydrocyclone, dense media microgranule can be adjusted and be subject in water
Buoyancy, gravity and external force, it is ensured that the stability of suspension, overcome desliming screen sieve plate by 6mm
It is reduced to the de-stabilising effect that suspension in dense-medium shallow-tank separator is caused by 3mm；
(7) use the coal separation desliming system of the present invention that raw coal is sorted, improve sorting and obtain
The caloric value of marketable coal, and further increase the quality of the marketable coal that sorting obtains.
Accompanying drawing explanation
Fig. 1 is the process chart of intrinsic coal separation desliming system；
Fig. 2 is the opening of device situation map of intrinsic coal separation desliming system；
Fig. 3 is the coal separation desliming system process chart in one embodiment of the present invention；
Fig. 4 is the coal separation desliming system opening of device situation map in one embodiment of the present invention；
Fig. 5 be the present invention in one embodiment coal separation desliming system in desliming screen upper nozzle
The schematic diagram of the Flow of Goods and Materials direction angulation α on water spraying direction and desliming screen compass screen surface.
Detailed description of the invention
Below by way of detailed description of the invention, technical scheme and effect thereof are described further.
Implementation below is merely to illustrate present disclosure, is not limited to the protection model of the present invention
Enclose.What the present invention was carried out by the design of the application present invention simply changes all claimed
In the range of.
The coal separation desliming system of the present invention, as in Figure 3-5, including:
Raw coal sizing screen 1: for raw coal is carried out 13mm classification；
Desliming screen 3: for carrying out from the material more than 13mm of described raw coal sizing screen 1
Desliming is sieved, and the sieve plate of described desliming screen 3 is 3mm sieve plate；
Dense-medium shallow-tank separator 4: shallow to obtain from the on-the-sieve material of described desliming screen 3 for receiving
Groove cleaned coal, and it is sold as the outward transport of marketable coal input product storehouse；
Coal slime bucket 5: for receiving the undersize material from described desliming screen 3；
Hydrocyclone 6: for receiving the material from described coal slime bucket 5, and it is carried out waterpower
Classification, obtains overflow material and underflow materials；Wherein, hydraulic classiciation is to utilize granule in current
The difference of sedimentation velocity and the gradation operation that carries out；The granularity ＜ 0.5mm of overflow material, the end
The granularity of stream material is 0.5-3mm；
Thickener 7: from the overflow material of described hydrocyclone 6 and it is taken off for reception
Water；
Sieve bend 9: from the underflow materials of described hydrocyclone 6 and it is taken off for reception
Water；The window screen size of sieve bend 9 is 0.35mm；
Filter 8: for receiving the concentration material from described thickener 7, and it is taken off further
Water, obtains fine coal slurry；
Coal slime centrifuge 10: for receiving the on-the-sieve material from described sieve bend 9, and it is entered
One step dehydration, obtains coarse slime；This part coarse slime inputs another system (well system of such as living)
Mixed coal on the coal of storehouse sealing-tape machine and another system (well system of such as living) carry out blending, as mixed
Coal is sold；
Described thickener 7 is additionally operable to receive from described filter 8 and described coal slime centrifuge 10
Filtrate, and the undersize material from described sieve bend 9.
The coal separation desliming system of the present invention, by being changed desliming screen 3 window screen size into 3mm by 6mm,
By in original design due to raw coal cannot washing and cause the spoil of the 3-6mm that cannot discharge to carry out
Effectively process and discharge, and then making the ash of the fine cleaned coal obtained be reduced to below 6wt%, promoting
The quality of fine cleaned coal and grade, obtain the fine cleaned coal of special low ash, and product price improves a lot,
It is effectively increased economic benefit；Meanwhile, can save 6 the second sieve bend 11,3 desk centrifuges 12,
First sealing-tape machine 13, scrapper conveyor these powerful devices of the 14, second sealing-tape machine 14, not only save
Power consumption, decreases the investment to equipment simultaneously, significantly reduces cost.
In one embodiment, described coal separation desliming system also includes disintegrating apparatus 2, for former
Ature of coal amount is preferable, when can directly reach marketable coal standard, and big by from described raw coal sizing screen 1
Material in 13mm carries out broken obtaining lump coal, sells as marketable coal.
But general raw coal is all to reach quality of commercial coal, so disintegrating apparatus typically need not.
In one embodiment, described coal separation desliming system also includes the second sieve bend 11, described
The second non-mounted sieve of sieve bend 11, and its on-the-sieve material exit is provided with closure baffle plate, is used for
By the undersize material from described desliming screen 3, all undersize material through described second sieve bend 11 goes out
Mouth inputs in described coal slime bucket 5.Closure baffle plate can be iron plate, it is also possible to for any other material
Baffle plate, as long as can realize closure effect, all can use.In order to economize on resources, it is possible to use
During maintenance repair, remaining leftover pieces make and obtain.
When the coal separation that on the basis of intrinsic, coal separation desliming system is transformed the present invention obtained
During desliming system, cumbersome owing to removing no main equipment, and need to rearrange pipeline,
Quantities is relatively big, expends the time and fund is more, at this moment can remove, such as this embodiment
In, described coal separation desliming system can also include the second sieve bend 11, is now to make full use of
Existing resource and facilitate the consideration of comb, is not required to remove the second sieve bend 11 on the basis of intrinsic,
But the second sieve bend 11 no power, not mounted sieve, and the outlet of its on-the-sieve material is blocked, with
The undersize material of desliming screen 3 undersize material all through described second sieve bend 11 is made to export input institute
Stating in coal slime bucket 5, the second sieve bend 11 now the most only plays the effect of chute, so,
Improve on the basis of intrinsic, just eliminate dismounting main equipment and pipeline and rearrange pipe
Line and the trouble of chute, take full advantage of existing resource, saves time, manpower and equipment investment,
Also save power consumption simultaneously.But, improve on the basis of intrinsic, and
When being directly newly to set up coal separation desliming system, it is possible to do not arrange the second sieve bend 11, save equipment
Investment.
In one embodiment, described desliming screen 3 is provided with at least 10 shower nozzles, and preferably 18
Individual.
Desliming screen 3 arranges 18 shower nozzles, original design many 8 of ratio, the setting of more shower nozzle, increases
The injection flow rate of desliming screen 3, improves the desliming efficiency of desliming screen 3, improves economic benefit
In one embodiment, the water spraying direction of described shower nozzle with from described raw coal sizing screen 1
On-the-sieve material flow direction on the compass screen surface of described desliming screen 3 be at an angle of α, 90 °≤α≤150 °；
Preferably α=120 °.Angle [alpha] specifically refers at water spraying direction and the compass screen surface corresponding with water spraying direction
Flow of Goods and Materials direction angulation.
As it is shown in figure 5, current refer to the current that shower nozzle sprays, water spraying direction is water (flow) direction；
Material stream refers to the material stream on the compass screen surface of desliming screen 3, and this material stream is from raw coal sizing screen 1
On-the-sieve material.
Compass screen surface refers to sieve plate plane.
The water spraying direction of the shower nozzle of desliming screen 3 and the on-the-sieve material from raw coal sizing screen 1 are in desliming
Flow direction angulation α on the compass screen surface of sieve 3 is in the range of 90 °-150 °, especially at 120 °
Time, the rolling of little sized coal grain can be effectively resulted in, thus reach optimal desliming effect.
In one embodiment, the upper upspout road control valve of described dense-medium shallow-tank separator 4
Aperture is 1/3.
In the course of the work, valve opening herein is 1/3 always.Upper upspout road control valve is opened
Degree is 1/3, it is meant that level stream flow is 3 times of upper up-flow flow.Level stream flow and upper up-flow
The ratio of flow can affect the stability of suspension in dense-medium shallow-tank separator 4.
In one embodiment, a diameter of 75-90mm of underflow mouth of described hydrocyclone 6,
Preferably 80mm.
The outspoken footpath of hydrocyclone 6 underflow is in the range of 75-90mm, especially during 80mm,
While can ensureing that the effluent concentration of hydrocyclone 6 and solids content are within normal range, prevent
Underflow mouth blocks, it is ensured that operating condition is normal.
By to desliming screen 3 shower nozzle and compass screen surface angle, upper up-flow control valve opening and hydraulic cyclone
The adjustment in the outspoken footpath of underflow etc. of device 6, it is ensured that in dense-medium shallow-tank separator 4, suspension stablizes
Property, overcome and desliming screen 3 sieve plate is reduced to 3mm to outstanding in dense-medium shallow-tank separator 4 by 6mm
The de-stabilising effect that supernatant liquid causes.
As it is shown on figure 3, in one embodiment, the technique mistake of the coal separation desliming system of the present invention
Journey is as follows:
Raw coal input raw coal sizing screen 1 carries out 13mm gradation sizing, more than the raw coal of 13mm
Enter desliming screen 3 and carry out 3mm gradation sizing, the on-the-sieve material input dense-medium shallow-tank more than 3mm
Separator 4 sorts；Undersize material input coal slime bucket 5 less than 3mm；
Material input hydrocyclone 6 in coal slime bucket 5 carries out classification, defeated through hydrocyclone 6
The overflow material input thickener 7 gone out is dehydrated, and the liquid of concentrated machine 7 output circulates as system
Being circulated in water entrance system, the solid material input filter 8 of concentrated machine 7 output continues
Dehydration；The solid material exported through filter 8 is product fine coal slurry；
The underflow materials input sieve bend 9 exported through hydrocyclone 6 is dehydrated, defeated through sieve bend 9
The on-the-sieve material input coal slime centrifuge 10 gone out continues dehydration；Through consolidating of coal slime centrifuge 10 output
Body material is product coarse coal slime；
Through the filtrate that filter 8 and coal slime centrifuge 10 export, and the sieve through sieve bend 9 output
Lower material, all exports to the pipeline from hydrocyclone 6 to thickener 7, with hydrocyclone 6
The overflow material mixing of output, and input in thickener 7 and be circulated.
When coal separation desliming system being transformed on the basis of original design, it is not necessary to remove the second arc
Shape sieve 11 and centrifuge 12, the technical process of coal separation desliming system is as follows:
Raw coal input raw coal sizing screen 1 carries out 13mm gradation sizing, more than the raw coal of 13mm
Enter desliming screen 3 and carry out 3mm gradation sizing, the on-the-sieve material input dense-medium shallow-tank more than 3mm
Separator 4 sorts；Undersize material input less than 3mm is as the second sieve bend of chute
In 11 (non-mounted sieves, and on-the-sieve material outlet blocked), and through the sieve of the second sieve bend 11
In lower material outlet input coal slime bucket 5, remaining each process is as technical process as shown in Figure 3.
As shown in Figure 4, in one embodiment, the equipment of the coal separation desliming system of the present invention is opened
Open situation as follows:
Only unlatching desliming screen 3, and 6 second sieve bend 11,3 desk centrifuge the 12, first adhesive tapes
Machine 13, scrapper conveyor 14 and the second sealing-tape machine 15 are all without opening and later all without using again.
Calculate by 6 desliming screens 3, the coal separation off-line system of the present invention, take off with intrinsic coal separation
Mud system is compared:
(1) only need to customize the desliming screen sieve plate of 3mm, disposable cost about 9.2 ten thousand yuan, there is no it
His expense；
(2) it is 61.25KW/ platform by the power of 3 desk centrifuges 12, the power of the first sealing-tape machine 13
Power for 18.5KW scrapper conveyor 14 is 220KW, and the power of the second sealing-tape machine 15 is 220KW
Calculating, general power is 642.25KW；According to open average every day 16 hours, the electricity charge be 0.5624
Unit/degree calculates, then can save the electricity charge whole year and be about 1,900,000 yuan；
(3) replacement cycle of centrifuge 12 basket (about 1.9 ten thousand yuan /) is reduced, according to 3
Centrifuge 12, annual every desk centrifuge 12 are changed 1.5 baskets and are calculated, then can save expense about 9
Ten thousand yuan/year；Decrease the scraper plate on scrapper conveyor 14, horse-shoe collar, and the first sealing-tape machine 13 and
The replacing quantity of the carrier roller for sealing-tape machine on two sealing-tape machines 15 and frequency, about 280,000 yuan/year, save significantly
Save material consumption；Equipment downtime is standby, then can reduce the routine work amount of employee, creates more
Many man-hours carry out other work；
(4) simplify washing link, decrease original design in the discharging coal slime band of 3 desk centrifuges 12
The moisture gone out, therefore the cycling use of water amount of system is from original 1373.76m3/ h increases to
1395.67m3/ h, increases 21.91m3/ h, produces regulation more flexible；And according to water for industrial use
4.16 yuan/m3If calculating, the 21.91m of increase3The cycling use of water amount of/h, can save wash water expense
About 530,000 yuan/year；
(5) black water all converges to hydrocyclone 6 and sorts, by hydrocyclone 6
The adjustment in the outspoken footpath of underflow, make underflow mouth discharge concentration (i.e. underflow materials concentration) from 148.5g/l
Increase to 342.5g/l, then the dehydration of entrance coal slime centrifuge 10 has obtained after sieve bend 9 is dehydrated
Coarse slime, dehydrating effect significantly improves；It addition, show according to result of laboratory test, the moisture of coarse slime
It is reduced to 20.80wt% from 22wt%, the most to a certain degree serves the effect of upgrading potentiation；(6)
In original design, the sieve plate of desliming screen 3 is 6mm sieve plate, owing to 6mm desliming makes a large amount of particulate
Level spoil enters fine cleaned coal, ash ＞ 6wt% always, it is impossible to reach the requirement of special low culm；And it is former
In system, the discharging (coarse slime) of 3 desk centrifuges 12 to be returned with fine cleaned coal and to be mixed this time and mix process meeting
Affect the quality of fine cleaned coal；In the present invention, after changing the sieve plate of desliming screen 3 into 3mm sieve plate, can
Discharge the spoil of 3-6mm grade and by the coal slime less than 3mm by purifying further, being dehydrated
Rear return mix well mixed coal of living (well mixed coal of wherein, living refer to work well system do not enter wash last raw coal, wash
It is dehydrated the solid material (that is, coarse slime) obtained and through filter 8 through coal slime centrifuge 10 after choosing
The mixed coal of the solid material (i.e. fine coal slurry) after dehydration) in, compared with original system, reduce
The discharging of centrifuge 12 (that is, coarse slime) and fine cleaned coal return the step mixed, and reduce end essence
The impact of coal, improves the quality of fine cleaned coal, and ash falls below about 5.5wt%, it is achieved that end essence
The production outward transport of the special low ash of coal；Utilizing the system of the present invention, 2015, great Liu tower coal preparation plant amounted to
Volume increase fine cleaned coal is special low grey 560,000 tons, can cause 25 yuan/ton according to being promoted to special low culm by mixed coal
Price difference calculate, create the economic benefit of 14,000,000 yuan.
In sum, the coal separation off-line system of the application, compared with original design, can create at least 1680
The economic benefit of ten thousand yuan/year.And the coal separation off-line system of the application is simpler, coal separation effect more
Add substantially, it is achieved that sub-elect the coal of more high-quality with less equipment, there is prominent advantage.
Claims (8)
1. a coal separation desliming system, it is characterised in that described coal separation desliming system includes:
Raw coal sizing screen (1): for raw coal is carried out 13mm classification；
At least one desliming screen (3): being used for will be from the on-the-sieve material of described raw coal sizing screen (1)
Carrying out desliming screening, the sieve plate of described desliming screen (3) is 3mm sieve plate；
Dense-medium shallow-tank separator (4): for receive from described desliming screen (3) on-the-sieve material also
It is sorted, to obtain shallow slot cleaned coal；
Coal slime bucket (5): for receiving the undersize material from described desliming screen (3)；
Hydrocyclone (6): for receiving the material from described coal slime bucket (5), and it is entered
Row hydraulic classiciation, obtains overflow material and underflow materials；
Thickener (7): for receiving from the overflow material of described hydrocyclone (6) and to it
It is dehydrated；
Sieve bend (9): for receiving from the underflow materials of described hydrocyclone (6) and to it
It is dehydrated；
Filter (8): for receiving the concentration material from described thickener (7), and it is entered
One step dehydration, obtains fine coal slurry；
Coal slime centrifuge (10): for receiving the on-the-sieve material from described sieve bend (9), and
To its further dehydration, obtain coarse slime；
Described thickener (7) is additionally operable to receive and is centrifuged from described filter (8) and described coal slime
The filtrate of machine (10), and the undersize material from described sieve bend (9).
Coal separation desliming system the most according to claim 1, it is characterised in that described coal separation takes off
Mud system also includes the second sieve bend (11), the non-mounted sieve of described second sieve bend (11), and
Its on-the-sieve material exit is provided with closure baffle plate, for will be under the sieve of described desliming screen (3)
Material is all through the undersize material outlet described coal slime bucket (5) of input of described second sieve bend (11)
In.
Coal separation desliming system the most according to claim 2, it is characterised in that described closure keeps off
Plate is iron plate.
4. according to the coal separation desliming system described in any one of claim 1-3, it is characterised in that institute
State desliming screen (3) and be provided with at least 10 shower nozzles, preferably 18.
Coal separation desliming system the most according to claim 4, it is characterised in that described shower nozzle
Water spraying direction and the on-the-sieve material from described raw coal sizing screen (1) are at described desliming screen (3)
Flow direction on compass screen surface is at an angle of α, 90 °≤α≤150 °；Preferably α=120 °.
6. according to the coal separation desliming system described in any one of claim 1-5, it is characterised in that institute
The upper upspout road controlling opening of valve stating dense-medium shallow-tank separator (4) is 1/3.
7. according to the coal separation desliming system described in any one of claim 1-6, it is characterised in that institute
State a diameter of 75-90mm of underflow mouth, preferably 80mm of hydraulic classification swirler.
8. utilize the method that the coal separation desliming system as described in any one of claim 1-7 carries out coal separation,
It is characterized in that, comprise the following steps:
Raw coal is carried out 13mm classification by described raw coal sizing screen (1), obtains under on-the-sieve material and sieve
Material；
Described desliming screen (3) receives the on-the-sieve material from described raw coal sizing screen (1), and right
It carries out desliming screening, obtains on-the-sieve material and undersize material；
Dense-medium shallow-tank separator (4) receives the on-the-sieve material from described desliming screen (3), and right
It carries out sorting to obtain cleaned coal；
Described coal slime bucket (5) receives the undersize material from described desliming screen (3)；
Described hydrocyclone (6) receives the material from described coal slime bucket (5), and enters it
Row hydraulic classiciation, obtains overflow material and underflow materials；
Described thickener (7) receives the overflow material from described hydrocyclone (6), and right
It is dehydrated, and obtains concentrating material；
Described sieve bend (9) receives the underflow materials from described hydrocyclone (6), and right
It is dehydrated, and obtains on-the-sieve material；
Described filter (8) receives the concentration material from described thickener (7), and enters it
One step dehydration, obtains fine coal slurry；
Described coal slime centrifuge (10) receives the on-the-sieve material from described sieve bend (9), and right
It is dehydrated further, obtains coarse slime；
Described thickener (7) also receives from described filter (8) and described coal slime centrifuge (10)
Filtrate, and the undersize material from described sieve bend (9), and being dehydrated.
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