CN102784757B - Efficient airflow classification fine-coal remover for power coal before selecting - Google Patents
Efficient airflow classification fine-coal remover for power coal before selecting Download PDFInfo
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- CN102784757B CN102784757B CN201210264403.8A CN201210264403A CN102784757B CN 102784757 B CN102784757 B CN 102784757B CN 201210264403 A CN201210264403 A CN 201210264403A CN 102784757 B CN102784757 B CN 102784757B
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Abstract
The invention belongs to the technical field of fine-coal removal and classification before washing and selecting of coal and particularly relates to an efficient airflow classification fine-coal remover for power coal before selecting. The fine-coal remover comprises the following components such as a material dispersion area, a primary classification area and a secondary classification area; in the material dispersion area, materials are collided under the impact of airflow and are dispersed mutually; in the primary classification area, the materials after dispersion are divided into primary fine particle materials and primary coarse particle materials through a 360-degree full-annular air-distribution and material-distribution mechanism; and in the secondary classification area, the primary fine particle materials are divided into secondary fine particle materials and secondary coarse particle materials through a wind power rotary driving classification mechanism, and the secondary fine particle materials and the secondary coarse particle materials are discharged out of the secondary classification area so as to finish the eventual classification. According to the invention, the material classification process includes two dispersions and two classifications, so as to solve the problem of screen blinding as well as improve classification efficiency at the same time, realize that classification granularity can be adjusted and controlled within 0-13 mm as required, meet the requirements of classification and section of whole particle dry process, and ensures that a circulating fluidized bed furnace of a mine -mouth power plant has coal to use for generating power.
Description
Technical field
The invention belongs to the front shedding classification technique of coal washing field, be specifically related to the front air current classifying powder remover of a kind of efficient thermal coal choosing.
Background technology
China's thermal coal aboundresources, but because China's thermal coal is mainly distributed in the north and western part, this Regional Distribution feature has determined the coal transportation and sales structure of coal in China " transporting the coal in the North to the South " and " transferring coal from the west to the east ", and there is the deficiency on transport power in China in Coal Transport, along with construction and the development of Chinese large-sized electric power stations near coal-mines, change defeated coal and become already inexorable trend for transmitting electricity.
Raising along with mining mechanization degree, in raw coal, fine coal content increases greatly, particle diameter is less than the smalls content of 13mm sometimes up to 70%～80%, and coal mostly is lower-grade metamorphic bituminous (sticky coal in jet coal, dross coal, weakly caking coal, 1/2), the lower-grade metamorphic bituminous maximum feature of ature of coal of China is that low ash, low-sulfur person are in the majority, the average ash content of raw coal can reach below 15%, if therefore can be directly separated as near coal-mine power plant coal for power generation, to greatly save transport power to alleviate the not enough problem of transport power, indirectly improve the selected ratio of lump coal simultaneously.
If adopt wet method to be selected in these Bed for Fine Coal, not only coal slime recovery system is complicated, the rate of recovery is low, and investment is large, and producing cost is high, in waste resource, has also caused the destruction to environment.
For dry coal preparation, although obtain certain effect, as the application of air dense medium fluidized bed and FX type, FGX type dry-dressing machine etc., also the western part, the northern territory coal washing environment that meet the few water of arid, but effective lower limit granularity of dry coal preparation sorting is 6mm, and still often there is sieve pore blockade problem to the sieve classification of 6mm and following particle size fraction in the classifying screen using in actual production, and coal adaptability is poor, does not guarantee classification efficiency.And near coal-mine power plant requires material size to be less than 6mm with CFBB, therefore how to realize partition size from any regulation and control of 0～13mm, to meet classification, the sorting of wholegrain level dry method, requiring and guarantee Circulation fluidized-bed furnace coal for power generation, is a technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of this invention is to provide the front air current classifying powder remover of a kind of efficient thermal coal choosing, this powder remover can effectively be realized partition size from regulation and control arbitrarily as required between 0～13mm, the classification, the sorting that have met wholegrain level dry method require and have guaranteed Circulation fluidized-bed furnace coal for power generation, thereby have greatly improved classification and drying efficiency.
For achieving the above object, the present invention has adopted following technical scheme: air current classifying powder remover before a kind of efficient thermal coal choosing, and it comprises following part:
Material dispersion district, for making material penetrate lower dispersion each other after collision effect rushing of air-flow, the material after dispersion enters scalping district;
Scalping district, scalping district comprises feed bin, on feed bin, be provided with exhaust outlet, in feed bin, be provided with 360 degree loopfuls to cloth wind material-feeding mechanism, material after dispersion is divided into a fine granular materials and a coarse granule material through 360 degree loopfuls to cloth wind material-feeding mechanism, a described fine granular materials enters secondary grading district to carry out further classification, and a described coarse granule material is discharged feed bin through coarse granule drainage conduit;
Secondary grading district, in secondary grading district, be provided with Wind-driven rotating and drive classification mechanism, a described fine granular materials drives classification mechanism to be divided into secondary fine granular materials and secondary coarse granule material through Wind-driven rotating, and described secondary fine granular materials and secondary coarse granule material are discharged respectively Wind-driven rotating and driven classification mechanism to complete final classification.
The present invention can also be able to further realization by following technical measures:
Preferably, described material dispersion district comprises high-pressure injection airduct one time, pan feeding member and dispersion member, the pipe shaft that the discharging opening of described pan feeding member is a skewed and described high-pressure injection airduct intersects, described dispersion member is arranged on high-pressure injection airduct and pan feeding member intersection, pipe shaft front side along air-flow direction of advance, the inner chamber of described dispersion member is is convenient to that material collides each other so that material dispersion hemispherical, disperse the feeding mouth of member to be connected with a high-pressure injection airduct, disperse the discharging opening of member pass feed bin and be set to towards 360 degree loopfuls to cloth wind material-feeding mechanism.
Preferably, described 360 degree loopfuls comprise to cloth wind material-feeding mechanism the pneumatic jig that is arranged on upside, the downside of pneumatic jig is provided with and is 360 degree loopfuls to the air-supply arrangement of cloth wind, on described pneumatic jig, be evenly equipped with the sieve aperture that the wind of being convenient to send here from air-supply arrangement place goes out, and the upper surface of pneumatic jig is set to be convenient to material landing skewed on pneumatic jig; The downside of described pneumatic jig is provided with stage isolation groove, the upside of stage isolation groove is the adjustable uncovered shape of size, and the uncovered edge of stage isolation groove stretches out the outside in the lower peripheral edge of pneumatic jig, the lower side outlet of stage isolation groove is connected with coarse granule drainage conduit, between the cell wall of described stage isolation groove and the inwall of feed bin, be provided with the passage that fine granular materials of confession passes through, the lower side outlet of described feed bin is connected with the feeding mouth in secondary grading district by fine grained drainage conduit.
Further, described pneumatic jig is coniform, and pneumatic jig is enclosed and formed by horizontal grating and longitudinal grating; Described longitudinal grating is radial cloth and is made as a plurality of under the top of coniform pneumatic jig is oblique, described horizontal grating in the form of a ring, and horizontal grating longitudinally grating is set to a plurality of from top to bottom, it is smooth circular-arc that the upper surface of described horizontal grating is, and laterally the incline direction of the incline direction of grating upper surface and the upper surface of pneumatic jig matches.
Further, described air-supply arrangement comprises the air feed post of vertical shape, and the revolution center line of the axis of described air feed post and pneumatic jig coincides; The lower end of described air feed post is that air intake is connected with supplying airduct, and the upper end of air feed post is connected with the bottom surface of pneumatic jig, and the upper segment column that is positioned at pneumatic jig masked areas of air feed post is provided with air supply hole with it; Described air-supply arrangement also comprise match with air feed post so that loopful to the ventilating duct of cloth wind, one end of described ventilating duct and air feed post are connected, and the air inlet of ventilating duct is connected with described air supply hole, one end away from air supply hole of ventilating duct is also that the air outlet of ventilating duct is set to the cloth wind gap forming between horizontal grating.
Further, the aperture of described air supply hole is identical, and along hoop be arranged in air feed post week side and the air supply hole in same level direction jointly form hoop air supply hole group, described air supply hole group is uniformly-spaced arranged on the shaft of air feed post from top to bottom; Described ventilating duct is corresponding one by one with air supply hole, and described ventilating duct is the fan shape being surrounded by dividing plate, and the air inlet place of ventilating duct is provided with and prevents the gasket seal that leaks out, and the end limit at the air outlet place of ventilating duct is resisted against on the bottom surface of described pneumatic jig; The base spacer of the ventilating duct in upside is all identical with the roof spacer size and shape of the adjacent ventilating duct in downside, and this base spacer roof spacer is connected with each other therewith.
Preferably, the air inlet place of described ventilating duct is provided with the wind-guiding screen of being convenient to realize even distributing wind in ventilating duct.
Further, described wind-guiding screen is flat tabular, and to be a side be the chock shape that plane, opposite side are inclined-plane in one end of the close described air supply hole of wind-guiding screen, and the inclined-plane side of the chock shape end of described wind-guiding screen is set to the barrel medial surface towards ventilating duct; The plate face of described wind-guiding screen is parallel to each other, and one end of the air inlet away from ventilating duct of wind-guiding screen is mutually concordant; The distance between plates of two adjacent air guiding grid plates is from the air inlet middle part of ventilating duct to increasing gradually between the barrel medial surface of ventilating duct, and the length of wind-guiding screen reduces between the barrel medial surface of ventilating duct gradually from the air inlet middle part of ventilating duct.
Preferably, the Wind-driven rotating in described secondary grading district drives classification mechanism to comprise stock grading district and the feeding zone of closed, described stock grading district comprises that secondary high-pressure sprays airduct, bend pipe buffer component and wind deflector, on the pipe shaft of described secondary high-pressure injection airduct, be provided with the feeding mouth being connected with fine grained drainage conduit, and secondary high-pressure sprays airduct and is connected with bend pipe buffer component, the discharging opening of bend pipe buffer component is towards wind deflector one side setting, described wind deflector is smooth curved arc shape and arranges a plurality of, the region that a plurality of wind deflectors surround forms material graded region discharge end, between adjacent wind deflector, form the air-guiding aisle that leads to stock grading district discharge end, and the top of the air intake of described air-guiding aisle is provided with pore, described stock grading district discharge end is connected with feeding zone.
Further, described feeding zone comprises classification storehouse, and classification is provided with blanking barrel in storehouse, and the top of blanking barrel is uncovered shape, and the open topped of blanking barrel be arranged on stock grading district discharge end under, the open topped area of described blanking barrel is less than the aperture area of stock grading district discharge end; The inside of described blanking barrel forms the fine granular materials feeding zone of passing through for secondary fine granular materials, forms the coarse granule material feeding zone of passing through for secondary coarse granule material between the outer wall of blanking barrel and the inwall in classification storehouse; The discharging opening place of described blanking barrel is provided with and makes blanking barrel inside is the air exhauster of negative pressure region.
The present invention has following beneficial effect:
1), first the present invention makes wet stock agglomerate obtain once disperseing comparatively fully by the dispersion member in material dispersion district, then by using cone shape pneumatic jig to make material obtain further dispersed, be also twice dispersing, material obtains scalping in by pneumatic jig twice dispersing, finally by Wind-driven rotating, drives classification mechanism to carry out secondary grading to material; And the present invention makes to keep negative pressure in classification storehouse in discharges material, guaranteed that material can be discharged smoothly when requiring partition size larger.
From the above, stock grading process of the present invention comprises twice dispersion and twice classification, when having improved classification efficiency, fundamentally solved sieve pore blockade problem, realized partition size from any regulation and control as required between 0～13mm, the classification, the sorting that have met wholegrain level dry method require and have guaranteed the coal for power generation of Circulation fluidized-bed furnace near coal-mine power plant, have promoted to become defeated coal into the process of the strategic change of transmission of electricity.
2), the pneumatic jig in the present invention is coniform, also be the coniform compass screen surface that the present invention has adopted hoop, single-point cloth and linear distributing mode that this cone shape compass screen surface distributing mode generally adopts compared with traditional fluid bed, can enlarge markedly the cloth area of fluid bed, thereby contribute to realize uniform distribution; Simultaneously the present invention is provided with and is 360 degree loopfuls to the air-supply arrangement of cloth wind at the downside of pneumatic jig, has realized hoop even distributing wind.Therefore the invention enables thickness of feed layer and in machine translational speed can regulate as required, thereby significantly improved production capacity, and improved classification, dry, cooling effectiveness.
3), in scalping district, first material drops to the upper surface of pneumatic jig from upside, because the upper surface of pneumatic jig is skewed, therefore material drops down along the upper surface of pneumatic jig, material is subject to the wind action that air-supply arrangement sends and bumps when dropping down, therefore in whole cloth process, owing to falling, the synergy of collision and gas shock, make wet stock clustered particles can obtain in time twice dispersing, thus be next step dry, graded operation is ready.
4), because the wind speed and direction of the hoop air-flow wind of pneumatic jig is adjustable, material just can be disperseed and fluidisation equably at friction parts with under compared with the situation of low gas velocity, thereby the energy consumption of greatly reducing, simultaneously this cloth wind, material-feeding mechanism are also less to the surface damage of material, therefore the present invention can be used for the dry of fragile material, does not also affect working effect when material particles is irregular.
5), the present invention can improve partly to enter to wash wet coal preparation the best and enter to wash lower limit, improves lump coal cleaning percent, optimizes product structure, and simplifies black water simultaneously and processes the decorum, reduces slime content, realizes Coal Preparation Plant maximization of economic benefit significant.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is that 360 degree loopfuls are to the structural representation of cloth wind material-feeding mechanism.
Fig. 3 is the structural representation of pneumatic jig.
Fig. 4 is the structural representation of air feed post.
Fig. 5 is the structural representation that air feed post and ventilating duct match.
Fig. 6,7 is the structural representation of ventilating duct.
Fig. 8 is the arrangement states schematic diagram of wind-guiding sieve plate.
Fig. 9 is the structural representation of wind-guiding sieve plate.
Figure 10 is the structural representation that Wind-driven rotating drives classification mechanism.
In figure, the implication of mark is as follows:
10-pneumatic jig 11-horizontal grating 12-longitudinal grating 13-cloth wind gap
20-air feed post, 21-air supply hole, 30-ventilating duct, 31-dividing plate
311-roof spacer, 312-base spacer 32-end limit, 33-wind-guiding screen
332-plane, 34-air intake, 40-material dispersion district, 331-inclined-plane
41-high-pressure injection airduct 42-pan feeding member 43-dispersion member
50-scalping district, 51-feed bin, 52-exhaust outlet, 53-stage isolation groove
54-coarse granule drainage conduit, 55-adjustable hinge 56-confession airduct
57-fine grained drainage conduit, 60-secondary grading district, 61-secondary high-pressure sprays airduct
62-bend pipe buffer component, 63-wind deflector, 64-pore
Discharge end 66-blanking barrel 67-fine granular materials feeding zone, 65-stock grading district
69-classification storehouse, 68-coarse granule material feeding zone
The specific embodiment
As shown in Figure 1, air current classifying powder remover before a kind of efficient thermal coal choosing, it comprises following part:
Scalping district 50, scalping district comprises feed bin 51, on feed bin 51, be provided with exhaust outlet 52, in feed bin 51, be provided with 360 degree loopfuls to cloth wind material-feeding mechanism, material after once disperseing obtains twice dispersing through 360 degree loopfuls after cloth wind material-feeding mechanism collides landing and gas shock, material after twice dispersing is divided into a fine granular materials and a coarse granule material, a described fine granular materials enters secondary grading district to carry out further classification, and a described coarse granule material is discharged feed bin 51 through coarse granule drainage conduit 54; From the above, described scalping district 50 is also the twice dispersing district of material;
Preferably, as shown in Figure 1, described material dispersion district 40 comprises high-pressure injection airduct 41 one time, pan feeding member 42 and dispersion member 43, the pipe shaft that the discharging opening of described pan feeding member 42 is a skewed and described high-pressure injection airduct 41 intersects, described dispersion member 43 is arranged on high-pressure injection airduct 41 and pan feeding member 42 intersections, pipe shaft front side along air-flow direction of advance, the inner chamber of described dispersion member 43 is is convenient to material collision so that material dispersion hemispherical, disperse the feeding mouth of member 43 to be connected with a high-pressure injection airduct 41, disperse the discharging opening of member 43 pass feed bin 51 and be set to towards 360 degree loopfuls to cloth wind material-feeding mechanism.
Preferably, as shown in Figure 2, described 360 degree loopfuls comprise the pneumatic jig 10 that is arranged on upside to cloth wind material-feeding mechanism, the downside of pneumatic jig 10 is provided with and is 360 degree loopfuls to the air-supply arrangement of cloth wind, on described pneumatic jig 10, be evenly equipped with the sieve aperture that the wind of being convenient to send here from air-supply arrangement place goes out, and the upper surface of pneumatic jig 10 is set to be convenient to material landing skewed on pneumatic jig; The positive downside of described pneumatic jig 10 is provided with stage isolation groove 53, the upside of stage isolation groove 53 is the adjustable uncovered shape of size, and the uncovered edge of stage isolation groove 53 stretches out the outside in the lower peripheral edge of pneumatic jig 10, the lower side outlet of stage isolation groove 53 is connected with coarse granule drainage conduit 54, between the inwall of the cell wall of described stage isolation groove 53 and feed bin 51, be provided with the passage that fine granular materials of confession passes through, the lower side outlet of described feed bin 51 is connected by the feeding mouth in fine grained drainage conduit 57Yu secondary grading district 60.
The upside of stage isolation groove 53 is the adjustable uncovered shape of size, for the ease of material is carried out to classification, as when the upside of stage isolation groove 53 uncovered hour, now only have the coarse granule material that particle diameter is larger can fall into stage isolation groove 53, most of material falls into the passage between the cell wall of stage isolation groove 53 and the inwall of feed bin 51 as a fine granular materials.The uncovered opening that also can make fixed size of upside of certain stage isolation groove 53.
Preferably, described pneumatic jig 10 is coniform, and pneumatic jig 10 is enclosed and formed by horizontal grating 11 and longitudinal grating 12; Described longitudinal grating 12 under the top of coniform pneumatic jig 10 is oblique, be radial cloth be made as a plurality of, described horizontal grating 11 in the form of a ring, and laterally grating 11 longitudinally grating 12 arrange from top to bottom.
Further, it is smooth circular-arc that the upper surface of described horizontal grating 11 is, and laterally the incline direction of the incline direction of grating 11 upper surfaces and the upper surface of pneumatic jig 10 matches.
Also as shown in Figure 3, described pneumatic jig 10 is the conical compass screen surfaces that surrounded by horizontal grating 11 and longitudinal grating 12, forms cloth wind gap 13 between two adjacent transverse gratings 11.The cross section of described horizontal grating 11 is smooth fan-shaped cambered surface, described fan-shaped one side contacts with longitudinal grating 12, fan-shaped another side extends to the outside of pneumatic jig 10, thereby the fan-shaped cambered surface of horizontal grating 11 is tiltedly bent downwardly along compass screen surface, and the collision that this frame mode is conducive to wet stock agglomerate when avoiding fine to stop up disperses.
As shown in Figure 2, the drift angle angle beta of described coniform pneumatic jig 10 is chosen between 60 °～120 ° according to screen length, raw meal particle size demand and wet stock agglomerate content.
Preferably, as shown in Fig. 2,4,5, described air-supply arrangement comprises the air feed post 20 of vertical shape, and the revolution center line of the axis of described air feed post 20 and pneumatic jig 10 coincides; The lower end of described air feed post 20 is air intake, and the upper end of air feed post 20 is connected with the bottom surface of pneumatic jig 10, and the upper segment column that is positioned at pneumatic jig 10 masked areas of air feed post 20 is provided with air supply hole 21 with it.
The aperture of described air supply hole 21 is identical, and is arranged in 20 weeks sides of air feed post and the air supply hole in same level direction 21 is common forms hoop air supply hole group along hoop, and described air supply hole group is uniformly-spaced arranged on the shaft of air feed post 20 from top to bottom.
As shown in Figure 4,5, the air supply hole 21 of described air feed post 20 is spaced six 360 ° of directions of level are first-class, and the quantity of air supply hole 21 can increase as required or reduce, and described six air supply holes 21 form a hoop air supply hole group; Hoop air supply hole group is vertically uniformly-spaced neatly arranged five groups on the shaft of air feed post 20, and the quantity of described hoop air feed post group can increase as required, thereby improves the uniformity of cloth wind.
Further, described air-supply arrangement also comprise match with air feed post 20 so that loopful to the ventilating duct 30 of cloth wind, one end of described ventilating duct 30 and air feed post 20 are connected, and the air inlet 34 of ventilating duct 30 is connected with described air supply hole 21, one end away from air supply hole 21 of ventilating duct 30 is also that the air outlet of ventilating duct 30 is set to the cloth wind gap 13 forming between horizontal grating 11.
Preferably, described ventilating duct 30 is corresponding one by one with air supply hole 21, described ventilating duct 30 is the fan shape being surrounded by dividing plate 31, and the air inlet place of ventilating duct 30 is provided with and prevents the gasket seal that leaks out, and the end limit 32 at the air outlet place of ventilating duct 30 is resisted against on the bottom surface of described pneumatic jig 10; The base spacer of the ventilating duct in upside is all identical with the roof spacer size and shape of the adjacent ventilating duct in downside, and this base spacer roof spacer is connected with each other therewith.
As shown in Figure 7, the upper and lower surface of described ventilating duct 30 is the sallop screen that angle is identical, and ventilating duct 30 is bolted on air feed post 20, and the air inlet 34 of ventilating duct 30 and overlapping for air port 21 on air feed post 20.
As shown in Figure 7, the specification of the ventilating duct 30 on same horizontal level is identical, and the base spacer 312 of ventilating duct 30 is greater than roof spacer 311 on radical length, thereby is convenient to realize the close contact with skewed compass screen surface.
As preferred version of the present invention, the air inlet place of described ventilating duct 30 is provided with the wind-guiding screen 33 of being convenient to realize ventilating duct 30 interior even distributing winds.
Further, as shown in Figure 9, described wind-guiding screen 33 is flat tabular, and to be a side be the chock shape that plane, opposite side are inclined-plane in one end of the close described air supply hole 21 of wind-guiding screen 33, and the inclined-plane side of the chock shape end of described wind-guiding screen 33 is set to the barrel medial surface towards ventilating duct 30.
Further, the plate face of described wind-guiding screen 33 is parallel to each other, and one end of the air inlet away from ventilating duct 30 of wind-guiding screen is mutually concordant; The distance between plates of two adjacent air guiding grid plates is from the air inlet middle part of ventilating duct 30 to increasing gradually between the barrel medial surface of ventilating duct 30, and the length of wind-guiding screen reduces between the barrel medial surface of ventilating duct 30 gradually from the air inlet middle part of ventilating duct 30.
As shown in Figure 8, described wind-guiding screen 33 is placed in ventilating duct 30, the side view of each wind-guiding screen 33 is similar, but the thickness of wind-guiding screen 33 and length are different, and the upper surface that is placed in ventilating duct air inlet 34 1 sides of wind-guiding screen 33 is ramped shaped or chock shape at an angle with lower surface.Because the central speed of the classification wind being entered by ventilating duct air inlet 34 is large, and peripheral direction wind speed is little, so the spacing of each wind-guiding screen 33 mind-set both sides in classification wind increase gradually, thereby classification wind is carried out to even distributing wind by the shape of ventilating duct 30.
As shown in Figure 8, the thickness of each wind-guiding screen 33 diminishes between the barrel medial surface of ventilating duct 30 gradually from the air inlet middle part of ventilating duct 30.
The surrounding of described ventilating duct air inlet 34 and air supply hole 21 contact jaws is provided with the stator of strap bolt, and ventilating duct 30 is connected and fixed by bolt and air feed post 20, and the place contacting with air feed post 20 at stator adds gasket seal in case leak-stopping wind.
In scalping district 50, material falls from the upside of coniform pneumatic jig 10, and because the upper surface of pneumatic jig 10 is skewed, so the wet stock of agglomerate drops down and constantly collide with compass screen surface along the upper surface of pneumatic jig 10, to realize being uniformly distributed of material; Simultaneously because 360 degree loopfuls can be realized to the comprehensive of pneumatic jig 10 and without the air feed at dead angle to the air-supply arrangement of cloth wind, so material is subject to the impact of the air-flow that air-supply arrangement sends and obtains further effectively disperseing when dropping down; By the setting in the cloth wind gap 13 between adjacent transverse grating 11, effectively avoided the obstruction of thin material, the size of total wind supply quantity of inputting by adjusting air feed post 20 is to regulate wind-force size, can effectively solve the bed uneven phenomenon occurring in classification process, realize even and efficient cloth wind, cloth, thereby realized the high-effective classifying to material.
As shown in Fig. 1,10, the Wind-driven rotating in described secondary grading district 60 drives classification mechanism to comprise stock grading district and the feeding zone of closed, described stock grading district comprises that secondary high-pressure sprays airduct 61, bend pipe buffer component 62 and wind deflector 63, on the pipe shaft of described secondary high-pressure injection airduct 61, be provided with the feeding mouth being connected with fine grained drainage conduit 57, and secondary high-pressure sprays airduct 61 and is connected with bend pipe buffer component 62, the discharging opening of bend pipe buffer component 62 is towards wind deflector 63 1 side settings, described wind deflector 63 is smooth curved arc shape and arranges a plurality of, the region that a plurality of wind deflectors 63 surround forms material graded region discharge end 65, between adjacent wind deflector, form the air-guiding aisle that leads to stock grading district discharge end 65, and the top of the air intake of described air-guiding aisle is provided with pore 64, described stock grading district discharge end 65 is connected with feeding zone.
Further, as shown in Figure 1, described feeding zone comprises classification storehouse 69, in classification storehouse 69, be provided with blanking barrel 66, the top of blanking barrel 66 is uncovered shape, and the open topped of blanking barrel 66 be arranged on stock grading district discharge end 65 under, the little edge of open topped area of described blanking barrel 66 is positioned at the inner side of the edge of opening of stock grading district discharge end 65; The inside of described blanking barrel 66 forms the fine granular materials feeding zone 67 of passing through for secondary fine granular materials, forms the coarse granule material feeding zone 68 of passing through for secondary coarse granule material between the outer wall of blanking barrel 66 and the inwall in classification storehouse 69; The discharging opening place of described blanking barrel 66 is provided with air exhauster.
Below in conjunction with Fig. 1, the course of work of the present invention is described further:
The present invention includes material dispersion district 40, scalping district 50He secondary grading district 60.
Described material dispersion district 40 is positioned at the top of powder remover, and it comprises high-pressure injection airduct 41, pan feeding member 42 and dispersion member 43 one time, and material is once disperseed in material dispersion district 40.
Between scalping district 50 material dispersion district 40He secondary grading district 60, the feed bin 51 that it comprises with exhaust outlet 52, is provided with pneumatic jig 10,360 degree loopfuls to air-supply arrangement and the stage isolation groove 53 of cloth wind in feed bin 51; Cone shape pneumatic jig 10 is by horizontal grating 11 and tapered compass screen surface that longitudinally grating 12 surrounds, between two adjacent horizontal gratings 11, forms cloth wind gap 13, described pneumatic jig 10 be placed in air-supply arrangement above; 360 degree loopfuls are to consist of air feed post 20 and ventilating duct 30 to the air-supply arrangement of cloth wind.The epimere of air feed post 20 stretches into the bottom of cone shape pneumatic jig 10, and the upper segment column of air feed post 10 be evenly placed with it equal and opposite in direction and uniformly-spaced arrange from top to bottom air supply hole 21, the present invention adopts six air supply holes 21 in each horizontal direction, and in the vertical direction air supply hole 21 is uniformly-spaced neatly arranged.The upper and lower surface of ventilating duct 30 is the sallop screen that angle is identical, and ventilating duct 30 is bolted on air feed post 20, and on the air inlet 34 of ventilating duct 30 and air feed post 20, air supply hole 21 coincides; The air inlet place of described ventilating duct 30 is provided with the wind-guiding screen 33 of being convenient to realize ventilating duct 30 interior even distributing winds; Stage isolation groove 53 is located at the downside of pneumatic jig 10, and the area of the open topped of stage isolation groove 53 is greater than the base area of pneumatic jig; The bottom of stage isolation groove 53 is connected by adjustable hinge 55 with coarse granule drainage conduit 54, and the feeding mouth that feed bin 51 passes through the secondary high-pressure injection airduct 61 in the fine grained drainage conduit 57Yu secondary grading district 60 bottom it is connected.
Concrete classification shedding process is as follows:
As shown in Figure 1, material is also that feed chute enters high-pressure injection airduct 41 one time by pan feeding member 42, rushing under the effect of penetrating of high-pressure blast, material enters into the hemispherical inner chamber that disperses member 43, material collides once to disperse with disperseing the wall of the hemispherical inner chamber of member 43, because the particulate agglomerate that adhesion forms is fully disperseed in this process.
Material vertical drop after dispersion is to the top of coniform pneumatic jig 10, material is able to dispersed to complete twice dispersing in the dropping process along coniform pneumatic jig 10 compass screen surfaces, ventilating duct 20 providers of coniform pneumatic jig 10 downsides are to the oblique lower and adjustable classification wind of intensity simultaneously, material be subject to seeing through cloth wind gap 13 be also sieve aperture classification wind flushing action and obtain separation, the air exhauster being now connected with exhaust outlet 52 is got rid of the classification wind that carries dust granules in time.Coal ash content in separating particles is low, density is close, large or fine granule is wherein according to the difference of its weight and the distance of the pneumatic jig compass screen surface that blown off is not identical yet, and the coarse granule material that weight is large falls in the cell body of stage isolation groove 53, and discharges through coarse granule drainage conduit 54; The fine granular materials that weight is lighter falls into the passage of the inwall formation of stage isolation groove 53 and feed bin 51, and continues to fall to through fine grained drainage conduit 57 feeding mouth that secondary high-pressure sprays airduct 61, thereby completes scalping.
Enter material that secondary high-pressure sprays airduct 61 and under the effect of penetrating, enter bend pipe buffer component 62 rushing of secondary high-pressure wind, bend pipe buffer component 62 is S-type, material enters the air-guiding aisle of wind deflector 63 formations along the tangential direction of wind deflector 63 through immediately, now under the effect of centrifugal force, classification obtains secondary coarse granule material and secondary fine granular materials, wherein the suction function Xia Jing stock grading district discharge end 65 of secondary fine granular materials in blanking barrel 66 enters the inner side of blanking barrel 66, and is discharged from rear collection; Secondary coarse granule material is discharged from after falling into the coarse granule material feeding zone 68 forming between the outer wall of blanking barrel 66 and the inwall in classification storehouse 69, thereby completes secondary grading.
Claims (8)
1. efficient thermal coal selects a front air current classifying powder remover, it is characterized in that comprising following part:
Material dispersion district (40), for making material penetrate lower dispersion each other after collision effect rushing of air-flow, the material after dispersion enters scalping district;
Scalping district (50), scalping district comprises feed bin (51), on feed bin (51), be provided with air draft ZI (52), in feed bin (51), be provided with 360 degree loopfuls to cloth wind material-feeding mechanism, material after dispersion is divided into a fine granular materials and a coarse granule material through 360 degree loopfuls to cloth wind material-feeding mechanism, a described fine granular materials enters secondary grading district to carry out further classification, and a described coarse granule material is discharged feed bin (51) through coarse granule drainage conduit (54);
Secondary grading district (60), in secondary grading district, be provided with Wind-driven rotating and drive classification mechanism, a described fine granular materials drives classification mechanism to be divided into secondary fine granular materials and secondary coarse granule material through Wind-driven rotating, and described secondary fine granular materials and secondary coarse granule material are discharged respectively Wind-driven rotating and driven classification mechanism to complete final classification;
Described material dispersion district (40) comprises a high-pressure injection airduct (41), pan feeding member (42) and dispersion member (43), the pipe shaft that the discharging opening of described pan feeding member (42) is a skewed and described high-pressure injection airduct (41) intersects, described dispersion member (43) is arranged on a high-pressure injection airduct (41) and pan feeding member (42) intersection, pipe shaft front side along air-flow direction of advance, the inner chamber of described dispersion member (43) is is convenient to that material collides each other so that material dispersion hemispherical, disperse the feeding mouth of member (43) to be connected with a high-pressure injection airduct (41), disperse the discharging opening of member (43) pass feed bin (51) and be set to towards 360 degree loopfuls to cloth wind material-feeding mechanism,
Described 360 degree loopfuls comprise the pneumatic jig (10) that is arranged on upside to cloth wind material-feeding mechanism, the downside of pneumatic jig (10) is provided with and is 360 degree loopfuls to the air-supply arrangement of cloth wind, on described pneumatic jig (10), be evenly equipped with the sieve aperture that the wind of being convenient to send here from air-supply arrangement place goes out, and the upper surface of pneumatic jig (10) is set to be convenient to material landing skewed on pneumatic jig; the positive downside of described pneumatic jig (10) is provided with stage isolation groove (53), the upside of stage isolation groove (53) is the adjustable uncovered shape of size, and the uncovered edge of stage isolation groove (53) stretches out the outside in the lower peripheral edge of pneumatic jig (10), the lower side outlet of stage isolation groove (53) is connected with coarse granule drainage conduit (54), between the inwall of the cell wall of described stage isolation groove (53) and feed bin (51), be provided with the passage that fine granular materials of confession passes through, the lower side outlet of described feed bin (51) is connected with the feeding mouth of secondary grading district (60) by fine grained drainage conduit (57).
2. air current classifying powder remover before efficient thermal coal choosing according to claim 1, is characterized in that: described pneumatic jig (10) is coniform, and pneumatic jig (10) is enclosed and formed by horizontal grating (11) and longitudinal grating (12); Described longitudinal grating (12) is radial cloth and is made as a plurality of under the top of coniform pneumatic jig (10) is oblique, described horizontal grating (11) in the form of a ring, and horizontal grating (11) longitudinally grating (12) is set to a plurality of from top to bottom, it is smooth circular-arc that the upper surface of described horizontal grating (11) is, and laterally the incline direction of the incline direction of grating (11) upper surface and the upper surface of pneumatic jig (10) matches.
3. efficient thermal coal according to claim 2 selects front air current classifying powder remover, it is characterized in that: described air-supply arrangement comprises the air feed post (20) of vertical shape, the revolution center line of the axis of described air feed post (20) and pneumatic jig (10) coincides; The lower end of described air feed post (20) is that air intake is connected with supplying airduct (56), the upper end of air feed post (20) is connected with the bottom surface of pneumatic jig (10), and the upper segment column that is positioned at pneumatic jig (10) masked areas of air feed post (20) is provided with air supply hole (21) with it; Described air-supply arrangement also comprise match with air feed post (20) so that loopful to the ventilating duct (30) of cloth wind, one end of described ventilating duct (30) and air feed post (20) are connected, and the air inlet of ventilating duct (30) is connected with described air supply hole (21), one end away from air supply hole (21) of ventilating duct (30) is also that the air outlet of ventilating duct (30) is set to the cloth wind gap forming between horizontal grating (11).
4. efficient thermal coal according to claim 3 selects front air current classifying powder remover, it is characterized in that: the aperture of described air supply hole (21) is identical, and along hoop, be arranged in all sides of air feed post (20) and the air supply hole in same level direction (21) forms hoop air supply hole group jointly, described air supply hole group is uniformly-spaced arranged on the shaft of air feed post (20) from top to bottom; Described ventilating duct (30) is corresponding one by one with air supply hole (21), described ventilating duct (30) is the fan shape being surrounded by dividing plate (31), the air inlet place of ventilating duct (30) is provided with and prevents the gasket seal that leaks out, and the end limit (32) at the air outlet place of ventilating duct (30) is resisted against on the bottom surface of described pneumatic jig (10); The base spacer of the ventilating duct in upside is all identical with the roof spacer size and shape of the adjacent ventilating duct in downside, and this base spacer roof spacer is connected with each other therewith.
5. air current classifying powder remover before efficient thermal coal choosing according to claim 3, is characterized in that: the air inlet place of described ventilating duct (30) is provided with the wind-guiding screen (33) of being convenient to realize even distributing wind in ventilating duct.
6. efficient thermal coal according to claim 5 selects front air current classifying powder remover, it is characterized in that: described wind-guiding screen (33) is flat tabular, and it is the chock shape that plane, opposite side are inclined-plane that one end of the close described air supply hole (21) of wind-guiding screen (33) is a side, the inclined-plane side of the chock shape end of described wind-guiding screen (33) is set to the barrel medial surface towards ventilating duct (30); The plate face of described wind-guiding screen (33) is parallel to each other, and one end of the air intake El (34) away from ventilating duct (30) of wind-guiding screen (33) is mutually concordant; The distance between plates of two adjacent air guiding grid plates is from the air inlet middle part of ventilating duct (30) to increasing gradually between the barrel medial surface of ventilating duct (30), and the length of wind-guiding screen (33) reduces between the barrel medial surface of ventilating duct (30) gradually from the air inlet middle part of ventilating duct (30).
7. according to air current classifying powder remover before the efficient thermal coal choosing described in claim 1～6 any one, it is characterized in that: the Wind-driven rotating in described secondary grading district (60) drives classification mechanism to comprise stock grading district and the feeding zone of closed, described stock grading district comprises that secondary high-pressure sprays airduct (61), bend pipe buffer component (62) and wind deflector (63), on the pipe shaft of described secondary high-pressure injection airduct (61), be provided with the feeding mouth being connected with fine grained drainage conduit (57), and secondary high-pressure sprays airduct (61) and is connected with bend pipe buffer component (62), the discharging opening of bend pipe buffer component (62) is towards wind deflector (63) one side settings, described wind deflector (63) is smooth curved arc shape and arranges a plurality of, the region that a plurality of wind deflectors (63) surround forms material graded region discharge end (65), between adjacent wind deflector, form the air-guiding aisle that leads to stock grading district discharge end (65), and the top of the air intake of described air-guiding aisle is provided with pore (64), described stock grading district discharge end (65) is connected with feeding zone.
8. efficient thermal coal according to claim 7 selects front air current classifying powder remover, it is characterized in that: described feeding zone comprises classification storehouse (69), in classification storehouse (69), be provided with blanking barrel (66), the top of blanking barrel (66) is uncovered shape, and the open topped of blanking barrel (66) be arranged on stock grading district discharge end (65) under, the little edge of open topped area of described blanking barrel (66) is positioned at the inner side of the edge of opening of stock grading district discharge end (65); The inside of described blanking barrel (66) forms the fine granular materials feeding zone (67) of passing through for secondary fine granular materials, forms the coarse granule material feeding zone (68) of passing through for secondary coarse granule material between the outer wall of blanking barrel (66) and the inwall of classification storehouse (69); The discharging opening place of described blanking barrel (66) is provided with and makes blanking barrel (66) inside is the air exhauster of negative pressure region.
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| CN111974682B (en) * | 2020-08-25 | 2024-06-04 | 中国石油大学(北京) | Particle classification device |
| CN113058853A (en) * | 2021-05-18 | 2021-07-02 | 王泽东 | Fine grain wind screen |
| CN115193716B (en) * | 2022-05-18 | 2024-06-14 | 江苏吉能达环境能源科技有限公司 | Grading equipment |
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| CN102784757A (en) | 2012-11-21 |
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