CN1100971A - Dry coal grading method and device - Google Patents
Dry coal grading method and device Download PDFInfo
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- CN1100971A CN1100971A CN 93111761 CN93111761A CN1100971A CN 1100971 A CN1100971 A CN 1100971A CN 93111761 CN93111761 CN 93111761 CN 93111761 A CN93111761 A CN 93111761A CN 1100971 A CN1100971 A CN 1100971A
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- 239000003245 coal Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 32
- 238000010332 dry classification Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 36
- 238000005204 segregation Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 10
- 239000007779 soft material Substances 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 2
- 239000008187 granular material Substances 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 12
- 238000000926 separation method Methods 0.000 description 6
- 238000012216 screening Methods 0.000 description 4
- 244000046052 Phaseolus vulgaris Species 0.000 description 3
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
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- 230000001174 ascending effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000015111 chews Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 240000008620 Fagopyrum esculentum Species 0.000 description 1
- 235000009419 Fagopyrum esculentum Nutrition 0.000 description 1
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- 238000007664 blowing Methods 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
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- 238000006062 fragmentation reaction Methods 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000010333 wet classification Methods 0.000 description 1
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Abstract
A coal dry classification method and its apparatus, utilize the alternate high-low velocity air current's cooperation through the vibrating plate, and the vibration of the vibrating plate, form the gas-solid flow field that the moving bed, fluidized bed, entrained flow bed combine together, the air current disturbs strongly, the collision friction among granules is violent on the lower part of the classification chamber and vibrating plate, make the moist mixed coal group disperse fast; big granule coal removes to the blown down tank along the vibration board and discharges, and well granule coal overflows the blown down tank with the overflow mode and discharges, and the granule coal is carried out the classification room by the air current clamp, is collected by the dust remover, adjusts air velocity, can make the arbitrary particle size high efficiency classification of hierarchical granularity at 0.5 ~ 6mm scope, and no dust pollution.
Description
The present invention relates to a kind of separation method and device thereof of material, especially a kind of dry classification method of moist coal and device.
The coal stage division has two classes: a class is to adopt the screening machine classification.For moist raw coal, the screening machine classification has a fatal weakness, is exactly that sieve aperture is easily clogged, and partition size is more little, and sieve pore blockade is serious more, therefore, the dry classification granularity of present all kinds of screening machines generally all is not less than 6mm, and during less than 6mm, classification efficiency is very low or can't classification.Another kind of is wind-force or hydraulic classiciation.Air classification only is used for the dry coal powder classification less than 0.5mm at present, and hydraulic classiciation is a wet classification, and using has limitation.Some new dry classification method and equipment thereof successively appear in recent years, as publication number is the patent application document of CN 10520614, a kind of oscillating fluidized powder classifier that proposes, be the control screen cloth to be installed at the body internal upper part, body is divided into crude separation chamber and thin separation chamber, between the thickness separation chamber, have and separate cone in order to regulating product granularity, and it is indoor to be placed on crude separation by the vibrated fluidized bed that electric activator drives.But this device only is used for the little powder of the granularity of classification drying, can't big, the moist material of partition size.And for example: " mixing the moving sieve air classifier that the stage material classification is used " of " coke and chemistry " the 7th phase 34～36 pages of introductions in 1991, mainly by carrying sieve band, distribution sieve, casing, air blast, induced duct, shell and feed hopper etc. to form, and in this classifying equipoment, the work zone of conveyer tilts, and to a high end motion, simultaneously by being with down to up-draught.When material is given to the stage casing of conveyer belt, in material feeding region, has not only realized the grading of material, but also fine particle stage material has been transported to the bottom exhaust end of work zone by different floor heights.Fine direction opposite with screen movement on air cushion moved.Bulky grain in the material can not be dropped on the moving sieve of material feeding region by fluidization, and is transported to the top exhaust end of work zone.But this grader wind speed control is strict, and this is because the flow velocity of air requires less than making the fluidised critical speed of minimum particulate; In feed zone, the speed of air blowing also only is equivalent to the fluidised critical speed of fine, if speed is too high, material not only can not classification, can mix on the contrary.Material should be dry in addition, and can not be the material of moist adhesion.And for example the Chinese patent notification number is a kind of dry type gradation equipment for coal of CN 2097691U proposition, be to utilize by air blast, the fluidized bed classification device, feeder, the device that deduster and air-introduced machine are formed makes coal be fluidized state in that fluidized bed classification is indoor under the fluidizing agent effect, the desiccation of intergranular mutual collision and fluidizing agent, the fine coal that makes fine coal roll into a ball and stick at coal grain surface is disperseed fast and is come off, wherein take out of outdoor with air-flow less than the fine coal of a certain particle diameter, collect by deduster, and the coal of greater particle size is discharged from the removal device of grading room bottom, thereby reaches effective classification of fine coal and beans.Wherein: at the stirring arm of the indoor introduction of fluidized bed classification, can strengthen the horizontal mixing of the indoor coal of fluidized bed classification, promote the even distribution of coal that the fluidized bed classification chamber can well be moved under shallow-layer, large coal particles can be scraped into removal device and be discharged the fluid bed grading room smoothly, and help the fragmentation and the dispersion of fine coal group.The difficulty but device maximizes, especially stirring arm should not be done too greatly, and this has brought restriction to application.
The objective of the invention is to propose a kind of new dry classification method for coal and device thereof in order to overcome above-mentioned the deficiencies in the prior art, is the degree of depth dry classification problem of 0.5～6mm to solve moist mixing coal partition size.
Task of the present invention is done in such a way that the moist coal that mixes drops on and stretches in the grading room on the oscillating plate that tilts, and along with the vibration of oscillating plate, moves in the grading room along the plate face.Air or hot flue gas slit or the hole on oscillating plate passes oscillating plate from bottom to top and enters grading room, forms some hyper tapes and weathering zone.The mating reaction of high low speed flow, and the vibration of oscillating plate, the gas-solid two-phase flow field that bottom formation moving bed, air flow bed, three kinds of gas-solid ways of contact of fluid bed combine in grading room makes the zoness of different of coal in grading room of different sizes be different motion states.At the high speed jet band, large coal particles moves on oscillating plate or beats, and is mobile status; The small particles coal is done upthrow motion by the high velocity air oscillating plate that blows off, and wherein, behind middle particle upthrow one height, because gas speed diminishes, can not continue to rise with air-flow, and unrestrained to adjacent weathering zone, small-particle coal is then directly carried secretly by air-flow, is the strength feed status.In weathering zone, large coal particles remains mobile status on oscillating plate, and is fluidization in the spatial domain of small particles certain altitude above oscillating plate, and wherein, middle particulate coal mainly does to fall after rise motion downwards, and small-particle coal is then further sublated.This gas-solid flow field flow perturbation is strong, and collision friction fierceness between particle makes the fine coal group of adhesion be easy to break up, and makes the fine coal that sticks at the large coal particles surface be easy to come off, and this is to realize moist key of mixing the coal high-efficiency dry classification.The strength delivery area that the grading room internal upper part is evenly distributed for gas speed, sinking speed is taken grading room less than the small-particle coal of grading room internal upper part air velocity out of by air-flow, and is collected by fines segregation device and deduster; The middle particulate coal that is the fluid bed state overflows into blow tank in the overflow mode; The large coal particles that moves along oscillating plate moves to exhaust end and falls into blow tank by deadweight, discharges grading room with chews, and the rising gas speed in the blow tank is identical with grading room top gas speed, sneaks into discharge nozzle to prevent granule, influences classification efficiency.
When the small-particle coal of being taken out of grading room by air-flow needs further classification (for example, from the granule of 0～6mm, isolate the Bed for Fine Coal of 1～6mm), Bed for Fine Coal separator bottom can connect a classification pipe, the Bed for Fine Coal of separating from the fines segregation device falls into the classification pipe equably in unrestrained mode and makes subsiding movement, sinking speed settles down in the classification pipe greater than the Bed for Fine Coal of ascending air speed in the classification pipe, discharge from classification pipe bottom, sinking speed then continues to be taken away by air-flow less than the fine coal of ascending air speed in the classification pipe, collect by deduster, reach the purpose of Bed for Fine Coal and the further classification of fine coal.
Compared with the prior art the present invention has the following advantages: the mating reaction of high low speed flow and the vibration of oscillating plate, the gas-solid two-phase flow field that three kinds of modes of moving bed, air flow bed, fluid bed in the formed grading room combine, make the fine coal group of adhesion be easy to break up, make the fine coal that sticks at the large coal particles surface be easy to come off, thereby can solve the moist dry classification that mixes coal effectively, partition size can be regulated arbitrarily in 0.5～6mm scope by regulating wind speed, and the classification efficiency height.When the coal free moisture is excessive, can adopt hot flue gas, the dry limit classification in limit, screening coal for any difficulty all can reach high-effective classifying.In addition, adopt negative-pressure operation, do not have dust to leak, pollution-free.The present invention has been widely used in coal sizing plant, moulded coal factory and thermal coal processing factory etc.Also can be used as the important preposition technology of air dense medium fluid bed coal dry separation technology.
Embodiments of the invention are described in further detail in conjunction with the accompanying drawings, wherein:
Fig. 1 is the structural representation of dry type gradation equipment for coal.
Fig. 2 is the vibration board structure schematic diagram of dry type gradation equipment for coal.
As depicted in figs. 1 and 2: dry type gradation equipment for coal is made up of blow tank lock gas removal device 1, the vibration casing 21 that comprises blow tank 4, total air compartment 3, separating chamber 7, branch air-valve 6, oscillating plate 9 and vibrator 5, grading room 13, classification Guan Suoqi removal device 14, classification pipe 16, fines separator 17, deduster 19, deduster lock gas removal device 18, air-introduced machine 20.The loam cake of vibration casing 21 has two mouthfuls is communicated with casing 21 tops respectively with grading room 13 and coal bunker 12, junction soft material 8(such as canvas etc.) sealing.The oscillating plate 9 that middle and upper part fixed installation one in vibration casing 21 is tilted, this oscillating plate 9 is a plane of oscillation dish plate, the plate face becomes 0 °～20 ° angles with horizontal plane; Oscillating plate 9 is divided into wind region 26 and feed zone 27 two parts, wind region 26 be positioned at grading room 13 under, feed zone 27 parts are positioned at coal bunker 12 discharging openings belows, another part constitutes feeder trough 22 with the loam cake of vibration casing 21.The wind region 26 of oscillating plate 9 is that several replace alternate high opening rate band 24 that is zonal distribution and low percent opening band 25 on the moving direction of coal, and its number is respectively 2～6; The percent opening of high opening rate band 24 is 25%～50%, and the percent opening of low percent opening band 25 is 1/4～1/2 of a high opening rate band percent opening, and the width of high opening rate band and low percent opening band is respectively 40～160mm.Wind region 26 upper surfaces at oscillating plate 9 have several parallel evenly distributed baffle plates 28, the trend of baffle plate 28 is identical with the moving direction of coal, spacing between each baffle plate 28 is 100～200mm, the oneself height of baffle plate 28 is 50～150mm, the setting of baffle plate 28 can make the coal grain when oscillating plate 9 moves, and remains even distribution at the width of oscillating plate.Below the wind region 26 of oscillating plate 9, casing 21 is separated into several and high opening rate band and the corresponding separating chamber 7 of low percent opening band with dividing plate; And casing 21 lower parts are divided into total air compartment 3 with dividing plate, install with separating chamber 7 connector places at total air compartment 3 and divide an air-valve 6, to regulate the air quantity of each separating chamber; Have the air inlet 23 of total air compartment 3 at the lower left quarter of vibration casing 21.In casing 21, fix a dividing plate downwards from wind region 26 ends of oscillating plate 9, vibration casing 21 is separated out the blow tank 4 that is communicated with grading room 13, blow tank 4 lower sides have the air inlet 2 that can regulate throughput, equate to adjust in the hopper 4 rising gas speed and grading room 13 tops on average gas is fast.Blow tank 4 seals with soft material 8 with the junction of blow tank lock gas removal device 1.The high adjustable plate 10 of fluidized bed is a long baffle plate, it be across oscillating plate 9 terminal discharging openings directly over, the both sides of adjustable plate 10 are embedded in the chute on vibration casing 21 two sides, and adjustable up and down; Change the oneself height of adjustable plate 10, can regulate the fluid bed height of bed, regulate the gap of adjustable plate 10 lower edges and oscillating plate 9, pass through smoothly along the large coal particles that oscillating plate 9 vibrates guaranteeing, and the small particles coal that is the fluid bed state can't pass through.Fixed installation vibrator 5 on the casing 21 below the feed zone 27 of oscillating plate 9, the shake frequency of vibrator 5 is 750～1500r/min, amplitude range is 2～6mm; Vibration casing 21 and oscillating plate 9 are vibrated thereupon.
The granule that classification pipe 16 is taken out of grading room 13 by air-flow need be set during further classification, and the lower sides of classification pipe 16 has the air inlet 15 that can regulate air inflow, and the top of classification pipe 16 is communicated with the bottom of fines segregation device 17.The fines segregation device 17 that is communicated with grading room 13 is incorporated into deduster 19 through airduct, and deduster 19 is communicated with air-introduced machine 20 through airduct again.
The setting of blow tank lock gas removal device 1, classification Guan Suoqi removal device 14, deduster lock gas removal device 18 can realize smooth discharge and gastight purpose.Their difference are corresponding to be communicated with blow tank 4, classification pipe 16, deduster 19.
The course of work of the present invention is: the moist coal that mixes falls on the oscillating plate 9 from coal bunker 12, oscillating plate 9 makes coal move along oscillating plate 9 with vibrator 5 vibrations, enters grading room 13 continuously by feeder trough 22, be installed in the adjusting of the coal lock 11 at feeder trough 22 places, can control coal input quantity.Cold wind or hot flue gas pass oscillating plate 9 and enter grading room 13 through total air compartment 3, separating chamber 7, through fines segregation device 17 and deduster 19, are drawn by air-introduced machine 20 at last again.Whole system is a negative-pressure operation, no dust pollution.
Utilize the zonal distribution that divides air-valve 6 and oscillating plate 9 height percent openings, the air-flow that passes oscillating plate is divided into the high weathering zone of some interleaved (respectively being 2～6) on the moving direction of coal, the air velocity of hyper tape can be 1～5 times of the average air velocity in grading room top (partition size hour get big value), the air velocity of weathering zone is 0.5～1 times of grading room internal upper part mean air flow speed, and the average air velocity in grading room top equals the minimum delivery gas speed (sinking speed) with the corresponding small-particle coal of partition size.Example: the top of grading room average cold conditions gas speed is when the 1mm classification, for about 4.3m/s, during the 3mm classification, for about 6.8m/s, during the 6mm classification, for about 8.5m/s.The alternating action of high weathering zone and the vibration of oscillating plate make and form the gas-solid flow field that moving beds, fluid bed, air flow bed combine above the wind region 26 of grading room bottom, oscillating plate 9; Large coal particles is beated or is rolled along oscillating plate all the time, is mobile status; Middle particulate coal is done the upthrow motion at hyper tape, does motion in weathering zone, shallow fluid bed of formation above the oscillating plate wind region; Small-particle coal is carried secretly by air-flow or is sublated, and is the strength feed status.This large, medium and small particulate coal has the gas-solid flow field of different motion state and has created fabulous condition for the moist coal dry classification that mixes.This is because this flow field flow perturbation is big, and collision friction fierceness between particle makes the fine coal group of adhesion be easy to disperse, and makes the fine coal that sticks at the large coal particles surface be easy to come off, and this is the key that realizes moist coal high-efficiency dry classification.
Big-and-middle buckwheat coal is after the effect of above-mentioned flow field, at last by different way, grading rooms are discharged in different outlets: the big beans that moves along oscillating plate is through the gap of fluidized bed high adjustable plate 10 lower edges and oscillating plate 9, fall into blow tank 4, the chews that is the fluid bed state overflows into blow tank 4 in the overflow mode; Utilize the high adjustable plate 10 of fluidized bed, the adjustable throttle bed height of bed and the middle time of staying of particulate coal in grading room 13, it is more complete that fine coal group is disperseed, and the fine coal that sticks at big beans surface comes off more abundant; Sinking speed is entrained with grading room 13 less than the small-particle coal of grading room 13 top gas speed by air-flow, enters fines segregation device 17.Adjust the intake of hopper 4 lower sides air inlets 12, the rising gas speed in the blow tank 4 is equated with grading room 13 top gas speed, sneak into the small-particle coal of blow tank 4 and further sublated, improve classification efficiency.The coal that falls into blow tank is discharged by blow tank lock gas removal device 1.
When being brought to the further classification of small-particle coal need of fines segregation device 17 by air-flow, the air inflow that can regulate classification pipe 16 bottom air inlets 15 equates the sinking speed of the corresponding coal grain with partition size of rising gas speed in the classification pipe 16.Sinking speed settles down greater than the Bed for Fine Coal of this rising gas speed, is discharged by classification Guan Suoqi removal device 14; Sinking speed continues to be carried secretly by air-flow less than the fine coal of classification pipe rising gas speed, is collected by deduster 19, discharges from deduster lock gas removal device 18 again.
Claims (10)
1, a kind of dry type gradation equipment for coal, form by blow tank lock gas removal device (1), the vibration casing (21) that comprises blow tank (4), total air compartment (3), separating chamber (7), branch air-valve (6), oscillating plate (9) and vibrator (5), grading room (13), classification Guan Suoqi removal device (14), classification pipe (16), fines separator (17), deduster lock gas removal device (18), deduster (19), air-introduced machine (20), it is characterized in that:
A. the loam cake that vibrates casing (21) has two mouthfuls, and casing (21) top is communicated with grading room (13) and coal bunker (12) respectively, and the junction seals with soft material (8); The oscillating plate (9) that middle and upper part fixed installation one in vibration casing (21) is tilted, this oscillating plate (9) is a plane of oscillation dish plate and is divided into wind region (26) and feed zone (27) two parts, wind region (26) be positioned at grading room (13) under, feed zone (a 27) part is positioned at coal bunker (12) discharging opening below, and another part constitutes feeder trough (22) with the loam cake of vibration casing (21); The wind region (26) of oscillating plate (9) is that several replace alternate high opening rate band (24) that is zonal distribution and low percent opening band (25) on the moving direction of coal; Upper surface at wind region (26) has several parallel evenly distributed baffle plates (28), and the trend of baffle plate (28) is identical with the moving direction of coal; Below wind region (26), casing (21) is separated into several separating chambers (7) corresponding with high opening rate band and low percent opening band with dividing plate; And casing (21) lower part is divided into total air compartment (3) with dividing plate, and install with separating chamber (7) connector place at total air compartment (3) and divide air-valve (6), have the air inlet (23) of total air compartment (3) at the lower left quarter of vibration casing (21); Wind region (26) end from oscillating plate (9) in casing (21) is fixed a dividing plate downwards, vibration casing (21) is separated out the blow tank (4) that is communicated with grading room (13), blow tank (4) lower sides has the air inlet (2) that can regulate throughput, and blow tank (4) seals with soft material (8) with the junction of blow tank lock gas removal device (1); The high adjustable plate of fluidized bed (10) is a long baffle plate, it be across the terminal discharging opening of oscillating plate (9) directly over, the both sides of adjustable plate (10) are embedded in the chute on vibration casing (21) two side, and adjustable up and down; Casing (21) is gone up fixed installation vibrator (5) below the feed zone (27) of oscillating plate (9);
B. grading room (13) is the up big and down small casing in cross section, and the fines segregation device (17) that grading room (13) is communicated with is incorporated into deduster (19) through airduct, and deduster (19) is communicated with air-introduced machine (20) through airduct again; The top of classification pipe (16) is communicated with the bottom of fines segregation device (17), and has the air inlet (15) that can regulate air inflow at the lower sides of classification pipe;
C. for realizing that blow tank lock gas removal device (1), classification Guan Suoqi removal device (14), deduster lock gas removal device (18) difference correspondence that the gastight purpose of smooth discharge is provided with are communicated with blow tank (4), classification pipe (16), deduster (19);
D. the coal lock (11) that is used to control coal input quantity is mounted in feeder trough (22) and locates.
2, dry type gradation equipment for coal according to claim 1 is characterized in that: the plate face of oscillating plate (9) becomes 0 °～20 ° angles with horizontal plane; The percent opening of the high opening rate band (24) on the wind region (26) of oscillating plate (9) is 25%～50%, and the percent opening of low percent opening band (25) is 1/4～1/2 of a high opening rate band percent opening, and the width of high opening rate band and low percent opening band is 40～160mm; Be positioned at that spacing is 100～200mm between each baffle plates (28) of wind region (26) upper surface of oscillating plate (9), the oneself height of baffle plate (28) is 50～150mm.
3, dry type gradation equipment for coal according to claim 1 and 2 is characterized in that: the shake frequency of vibrator (5) is 750～1500r/min, and amplitude range is 2～6mm.
4, dry type gradation equipment for coal according to claim 1 and 2 is characterized in that: soft material (8) can adopt canvas etc.
5, dry type gradation equipment for coal according to claim 1 and 2 is characterized in that: high opening rate band (24) and low percent opening (25) are respectively 2～6.
6, a kind of dry classification method for coal, be humidity to be mixed coal fall on the oscillating plate (9) from coal bunker (12), oscillating plate (9) vibrates with vibrator (5), the moist coal that mixes is moved along oscillating plate (9), enter grading room (13) continuously by feeder trough (22), cold wind or hot flue gas are through total air compartment (3), separating chamber (7) passes oscillating plate (9) and enters grading room (13), again through fines segregation device (17) and deduster (19), draw by air-introduced machine (20) at last, it is characterized in that: the high opening rate band (24) and the low percent opening band (25) of the branch air-valve (6) of utilization adjusting separating chamber (7) air quantity and several interleaved of oscillating plate (9) wind region (26) make the air-flow that passes oscillating plate (9) be divided into the high weathering zone of several interleaved on the moving direction of coal; Under the vibration of the alternating action of high weathering zone and oscillating plate (9), on the wind region (26) of grading room (13) bottom, oscillating plate (9), form that moving bed, fluid bed, air flow bed combine, flow perturbation is strong, the gas-solid flow field of collision friction fierceness between particle, the moist coal group of mixing is disperseed fast, wherein: large coal particles is beated or is rolled along oscillating plate (9) all the time, falls into blow tank (4) to oscillating plate (9) exhaust end by deadweight; Middle particulate coal is done the upthrow motion at hyper tape, does to fall after rise motion in weathering zone, forms a shallow fluid bed above oscillating plate (9) wind region (26), and overflows into blow tank (4) in the overflow mode; Small-particle coal then directly is entrained with grading room (13) by air-flow, is collected by fines segregation device (17) and deduster (19); Whole system is a negative-pressure operation.
7, dry classification method for coal according to claim 6, it is characterized in that: the strength delivery area that grading room (13) top is evenly distributed for gas speed, the minimum delivery gas speed that its mean air flow speed equals with the corresponding small-particle coal of partition size is sinking speed, the air velocity of hyper tape is 1～5 times of the average air velocity in grading room (13) top, and the air velocity of weathering zone is 0.5～1 times of the average air velocity in grading room (13) top.
8, according to claim 6 or 7 described dry classification method for coal, it is characterized in that: grading room (13) top average cold conditions gas speed is when the 1mm classification, for about 4.3m/s; When the 3mm classification, for about 6.8m/s; When the 6mm classification, for about 8.5m/s.
9, according to claim 6 or 7 described dry classification method for coal, it is characterized in that: the rising gas speed of blow tank (4) equates that with the top gas speed of grading room high weathering zone is respectively 2～6.
10, according to claim 6 or 7 described dry classification method for coal, it is characterized in that: when being brought to the further classification of small-particle coal need of fines segregation device (17) by air-flow, connect a classification pipe (16) in the bottom of fines segregation device (17), the sinking speed of the corresponding coal grain with partition size of rising gas speed of classification pipe (16) equates; Sinking speed settles down greater than the Bed for Fine Coal of rising gas speed, discharges from classification pipe (16) bottom; Sinking speed continues to be taken away by air-flow less than the fine coal of classification pipe (16) rising gas speed, is collected by deduster (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93111761A CN1045552C (en) | 1993-09-29 | 1993-09-29 | Dry coal grading method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN93111761A CN1045552C (en) | 1993-09-29 | 1993-09-29 | Dry coal grading method and device |
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| CN1100971A true CN1100971A (en) | 1995-04-05 |
| CN1045552C CN1045552C (en) | 1999-10-13 |
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| CN93111761A Expired - Fee Related CN1045552C (en) | 1993-09-29 | 1993-09-29 | Dry coal grading method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917567A (en) * | 1974-09-30 | 1975-11-04 | City Of San Diego | Air classifier for shredded refuse |
| SU860894A1 (en) * | 1979-12-11 | 1981-09-07 | Всесоюзный научно-исследовательский институт нерудных строительных материалов и гидромеханизации | Apparatus for sorting flat articles |
| SU988368A1 (en) * | 1981-08-06 | 1983-01-15 | Всесоюзный научно-исследовательский институт нерудных строительных материалов и гидромеханизации | Apparatus for sorting flat objects |
| JPH0522524Y2 (en) * | 1988-03-03 | 1993-06-10 | ||
| SU1711995A1 (en) * | 1989-07-24 | 1992-02-15 | Уральский научно-исследовательский институт черных металлов | Method of recovering abrasive materials from metallurgical slags |
-
1993
- 1993-09-29 CN CN93111761A patent/CN1045552C/en not_active Expired - Fee Related
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| CN102019275B (en) * | 2009-09-18 | 2013-11-27 | 中冶焦耐(大连)工程技术有限公司 | Airflow classifying and airflow drying process for coking coal |
| CN102120215A (en) * | 2010-09-19 | 2011-07-13 | 中国科学院过程工程研究所 | Solid particle material pneumatic grading preheating and humidifying method and device |
| CN102120215B (en) * | 2010-09-19 | 2013-05-01 | 中国科学院过程工程研究所 | Solid particle material pneumatic grading preheating and humidifying method and device |
| CN102520736A (en) * | 2011-11-08 | 2012-06-27 | 中国华能集团清洁能源技术研究院有限公司 | Load control method of coal nozzles of dry pulverized coal gasification furnace |
| CN102520736B (en) * | 2011-11-08 | 2014-07-02 | 中国华能集团清洁能源技术研究院有限公司 | Load control method of coal nozzles of dry pulverized coal gasification furnace |
| CN102784757A (en) * | 2012-07-27 | 2012-11-21 | 安徽理工大学 | Efficient airflow classification fine-coal remover for power coal before selecting |
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| CN103344092A (en) * | 2013-07-18 | 2013-10-09 | 王远飞 | Compound convection dryer |
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| CN104148164A (en) * | 2014-07-04 | 2014-11-19 | 中国海洋石油总公司 | Method for coal washing by means of carbon dioxide |
| CN104148164B (en) * | 2014-07-04 | 2016-09-21 | 中国海洋石油总公司 | A kind of method utilizing carbon dioxide to carry out coal washing |
| CN117644038A (en) * | 2024-01-25 | 2024-03-05 | 天津美腾科技股份有限公司 | Through-flow sorting device |
| CN117644038B (en) * | 2024-01-25 | 2024-05-28 | 天津美腾科技股份有限公司 | Through-flow sorting device |
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