CN102784757A - 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 PDF

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Publication number
CN102784757A
CN102784757A CN2012102644038A CN201210264403A CN102784757A CN 102784757 A CN102784757 A CN 102784757A CN 2012102644038 A CN2012102644038 A CN 2012102644038A CN 201210264403 A CN201210264403 A CN 201210264403A CN 102784757 A CN102784757 A CN 102784757A
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China
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air
wind
classification
ventilating duct
pneumatic jig
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CN2012102644038A
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CN102784757B (en
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王超
朱金波
龚磊
闵凡飞
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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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

Air current classifying powder remover before a kind of choosing of thermal coal efficiently
Technical field
The invention belongs to the preceding shedding classification technique field of coal washing, be specifically related to the preceding air current classifying powder remover of a kind of choosing of thermal coal efficiently.
Background technology
China's thermal coal aboundresources; But because China's thermal coal mainly is distributed in the north and western part; This Regional Distribution characteristics have 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 China, changes defeated coal and becomes inexorable trend already for transmission of electricity along with the construction and the development of Chinese large-sized electric power stations near coal-mines in the deficiency that exists on the Coal Transport on the transport power.
Raising along with the mining mechanization degree; Fine coal content increases greatly in the raw coal; Sometimes up to 70%~80%, and mostly coal be lower-grade metamorphic bituminous (sticking coal in jet coal, dross coal, the weakly caking coal, 1/2) to particle diameter less than the smalls content of 13mm, and the lower-grade metamorphic bituminous maximum characteristics of ature of coal of China are that low ash, low-sulfur person are in the majority; The average ash content of raw coal can reach below 15%; If therefore can direct separation as near coal-mine power plant coal for power generation, will greatly save transport power to alleviate the not enough problem of transport power, improve the selected ratio of lump coal simultaneously indirectly.
If adopt wet method that these Bed for Fine Coal are selected in, then not only the coal slime recovery system is complicated, the rate of recovery is low, and investment is big, and producing cost is high, in the waste resource, has also caused environment damage.
For dry coal preparation; Although obtain certain effect,, also meet western part, the northern territory coal washing environment of the few water of arid like the application of air dense medium fluid bed and FX type, FGX type dry-dressing machine etc.; But effective lower limit granularity of dry coal preparation sorting is 6mm; And the classifying screen that uses in the actual production sieve pore blockade problem still often occurs to the sieve classification of 6mm and following particle size fraction, and coal adaptability is poor, has guaranteed not classification efficiency.And near coal-mine power plant requires material size less than 6mm with CFBB; Therefore how to realize any regulation and control of partition size from 0~13mm; Requiring and guarantee the Circulation fluidized-bed furnace coal for power generation with classification, the sorting of satisfying wholegrain level dry method, is a technical barrier that needs to be resolved hurrily.
Summary of the invention
The purpose of this invention is to provide the preceding air current classifying powder remover of a kind of choosing of thermal coal efficiently; This powder remover can realize effectively that partition size is from regulation and control arbitrarily as required between 0~13mm; Classification, the sorting of having satisfied wholegrain level dry method requires and guaranteed the Circulation fluidized-bed furnace coal for power generation, thereby improved classification and drying efficiency greatly.
For realizing above-mentioned purpose, the present invention has adopted following technical scheme: air current classifying powder remover before a kind of choosing of thermal coal efficiently, and it comprises following part:
The material dispersion area is used to make material to penetrate down dashing of air-flow and after the collision effect, disperses each other, and the material after the dispersion gets into the scalping district;
The scalping district; The scalping district comprises feed bin; Feed bin is provided with exhaust outlet, is provided with 360 degree loopfuls in the feed bin to cloth wind material-feeding mechanism, and the material after the dispersion is divided into a fine granular materials and a coarse granule material through 360 degree loopfuls to cloth wind material-feeding mechanism; A said fine granular materials gets into the secondary graded region to carry out further classification, and a said coarse granule material is discharged feed bin through the coarse granule drainage conduit;
The secondary graded region; Be provided with the wind-force rotation in the secondary graded region and drive classification mechanism; A said fine granular materials drives classification mechanism through the wind-force rotation and is divided into secondary fine granular materials and secondary coarse granule material, and said secondary fine granular materials and secondary coarse granule material are discharged the wind-force rotation respectively and driven classification mechanism to accomplish final classification.
The present invention can also be able to further realization through following technical measures:
Preferably; Said material dispersion area comprises high-pressure injection airduct, a pan feeding member and disperses member; The pipe shaft that the discharging opening of said pan feeding member is a skewed and said high-pressure injection airduct intersects; Said dispersion member be arranged on high-pressure injection airduct and pan feeding member intersection, along the pipe shaft front side of air-flow direction of advance; The inner chamber of said dispersion member is that to be convenient to that material collides each other hemispherical so that material disperses, disperses the feeding mouth of member to be connected with a high-pressure injection airduct, disperses the discharging opening of member to pass feed bin and be set to and spends loopfuls to cloth wind material-feeding mechanism towards 360.
Preferably; Said 360 degree loopfuls comprise the pneumatic jig that is arranged on upside to cloth wind material-feeding mechanism; The downside of pneumatic jig is provided with and is the air-supply arrangement of 360 degree loopfuls to cloth wind; Be evenly equipped with the sieve aperture of being convenient to go out on the said pneumatic jig, and the upper surface of pneumatic jig is set to be convenient to material landing skewed on pneumatic jig from the wind that the air-supply arrangement place sends here; The downside of said pneumatic jig is provided with the stage isolation groove; The upside of stage isolation groove is the uncovered shape of adjustable size; And the uncovered edge of stage isolation groove stretches out the outside in the lower peripheral edge of pneumatic jig; The following side outlet of stage isolation groove is connected with the coarse granule drainage conduit, is provided with the passage that fine granular materials of confession passes through between the cell wall of said stage isolation groove and the inwall of feed bin, and the following side outlet of said feed bin is connected through the feeding mouth of fine grained drainage conduit with the secondary graded region.
Further, said pneumatic jig is coniform, and pneumatic jig is surrounded by horizontal grating and vertical grating and forms; Said vertical grating is radial cloth and is made as a plurality of under the top of coniform pneumatic jig is oblique; Said 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 said horizontal grating is, and laterally the incline direction of the upper surface of incline direction and the pneumatic jig of grating upper surface matches.
Further, said air-supply arrangement comprises the air feed post of vertical shape, and the revolution center line of the axis of said air feed post and pneumatic jig coincides; The lower end of said air feed post is that air intake is connected with the air feed pipe, and the upper end of air feed post links to each other with the bottom surface of pneumatic jig, and the epimere shaft that is positioned at the pneumatic jig masked areas of air feed post is provided with air supply hole; Said air-supply arrangement also comprise match with the air feed post so that loopful to the ventilating duct of cloth wind; One end and the air feed post of said ventilating duct are connected; And the air inlet of ventilating duct is connected with said air supply hole, and the end away from air supply hole of ventilating duct also is that the air outlet of ventilating duct is set to the cloth wind gap that between horizontal grating, constitutes.
Further, the aperture of said air supply hole is identical, and along hoop be arranged in air feed post week side and the air supply hole that is on the same horizontal direction constitute hoop air supply hole group jointly, said air supply hole group uniformly-spaced is arranged on the shaft of air feed post from top to bottom; Said ventilating duct is corresponding one by one with air supply hole, and said ventilating duct is the fan shape that is 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 said pneumatic jig; The base spacer of ventilating duct that is in upside is all identical with shape with the roof spacer size of the adjacent ventilating duct that is in downside, and this base spacer therewith roof spacer be connected with each other.
Preferably, the air inlet place of said ventilating duct is provided with the wind-guiding screen of being convenient to realize even distributing wind in the ventilating duct.
Further, said wind-guiding screen is flat tabular, and the end near said air supply hole of wind-guiding screen to be a side be that plane, opposite side are the chock shape on inclined-plane, the inclined-plane side of the chock shape end of said wind-guiding screen is set to the barrel medial surface towards ventilating duct; The plate face of said wind-guiding screen is parallel, and the end flush away from the air inlet of ventilating duct of wind-guiding screen; 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 from the air inlet middle part of ventilating duct the distance between plates of two adjacent wind-guiding screens gradually from the air inlet of ventilating duct middle part.
Preferably, the rotation of the wind-force in the said secondary graded region drives stock grading district and the blanking district that classification mechanism comprises closed; Said stock grading district comprises that secondary high-pressure sprays airduct, bend pipe buffer component and wind deflector; The pipe shaft that said secondary high-pressure sprays airduct is provided with the feeding mouth that is connected with the fine grained drainage conduit; And secondary high-pressure sprays airduct and is connected with the bend pipe buffer component; The discharging opening of bend pipe buffer component is towards wind deflector one side setting, and said wind deflector is smooth curved arc shape and is provided with a plurality ofly, and the zone that a plurality of wind deflector surrounded constitutes stock grading district discharge end; Constitute the air-guiding aisle that leads to stock grading district discharge end between the adjacent wind deflector, and the top of the air intake of said air-guiding aisle is provided with pore; Said stock grading district discharge end is connected with the blanking district.
Further; Said blanking district comprises the classification storehouse, and classification is provided with blanking barrel in the 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 said blanking barrel is less than the aperture area of stock grading district discharge end; The inside of said blanking barrel constitutes the fine granular materials blanking district that supplies the secondary fine granular materials to pass through, and constitutes the coarse granule material blanking district that supplies secondary coarse granule material to pass through between the inwall in the outer wall of blanking barrel and classification storehouse; The discharging opening place of said blanking barrel is provided with and makes blanking barrel inside be the air exhauster of negative pressure region.
The present invention has following beneficial effect:
1), the present invention at first makes wet stock gather group through the dispersion member in the material dispersion area and obtains comparatively fully once dispersion; Also be that secondary disperses through using cone shape pneumatic jig to make material obtain further evenly dispersion then; Material obtains scalping when being disperseed by the pneumatic jig secondary, drive classification mechanism through the wind-force rotation at last material is carried out the secondary classification; And the present invention makes in discharges material in the classification storehouse and keeps negative pressure, has guaranteed that material can be discharged smoothly when requiring partition size big.
From the above; Stock grading process of the present invention comprises twice dispersion and twice classification; When having improved classification efficiency, fundamentally solved the sieve pore blockade problem; Realized partition size from as required any regulation and control between 0~13mm, classification, the sorting of having satisfied wholegrain level dry method requires and guaranteed the coal for power generation of near coal-mine power plant with Circulation fluidized-bed furnace, promoted to become the process of defeated coal for the strategic change of transmitting electricity.
2), the pneumatic jig among the present invention is coniform; It also is 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 help to realize uniform distribution; The present invention simultaneously is provided with at the downside of pneumatic jig and is the air-supply arrangement of 360 degree loopfuls to cloth wind, has realized the 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, drying, cooling effectiveness.
3), in the scalping district; Material at first drops on the upper surface of pneumatic jig from upside; Because the upper surface of pneumatic jig is skewed, so material drops down along the upper surface of pneumatic jig, and material receives the wind action that air-supply arrangement sees off and bumps when dropping down; Therefore in whole cloth process; Because fall, the synergy of collision and gas shock, make wet stock gather a particle and can in time obtain secondary and disperse, thereby be that next step drying, graded operation got ready.
4), because the wind speed and direction of the hoop air-flow wind of pneumatic jig is adjustable; Make material just can disperse equably and fluidisation at the friction parts with under than 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, so the present invention can be used for the drying of frangible material, when material particles is irregular, also do not influence work.
5), the present invention can improve partly to go into to wash wet coal preparation the best and go into to wash limit, improves lump coal and goes into to wash ratio, optimizes product structure, and simplifies black water simultaneously and handles the decorum, reduces slime content, realizes that thermal coal coal preparation plant maximization of economic benefit is significant.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representations of 360 degree loopfuls to 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 sketch map of wind-guiding sieve plate.
Fig. 9 is the structural representation of wind-guiding sieve plate.
Figure 10 drives the structural representation of classification mechanism for the wind-force rotation.
The implication of mark is following among the figure:
10-pneumatic jig 11-horizontal grating 12-vertical 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
34-air intake, 40-material dispersion area, 332-plane, 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-air feed pipe
57-fine grained drainage conduit, 60-secondary graded region, 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 blanking district, 65-stock grading district
69-classification storehouse, 68-coarse granule material blanking district
The specific embodiment
As shown in Figure 1, air current classifying powder remover before a kind of choosing of thermal coal efficiently, it comprises following part:
Material dispersion area 40 is used to make material to penetrate down dashing of air-flow and after the collision effect, disperses each other, and be the once dispersion of material this moment, and the material after the dispersion gets into the scalping district;
Scalping district 50; The scalping district comprises feed bin 51; Feed bin 51 is provided with exhaust outlet 52; Be provided with 360 degree loopfuls in the feed bin 51 to cloth wind material-feeding mechanism, the material after once disperseing obtains secondary through 360 degree loopfuls after cloth wind material-feeding mechanism collides landing and gas shock disperses, and the material after secondary disperses is divided into a fine granular materials and a coarse granule material; A said fine granular materials gets into the secondary graded region to carry out further classification, and a said coarse granule material is discharged feed bin 51 through coarse granule drainage conduit 54; From the above, said scalping district 50 also is the secondary dispersion area of material;
Secondary graded region 60; Be provided with the wind-force rotation in the secondary graded region and drive classification mechanism; A said fine granular materials drives classification mechanism through the wind-force rotation and is divided into secondary fine granular materials and secondary coarse granule material, and said secondary fine granular materials and secondary coarse granule material are discharged the wind-force rotation respectively and driven classification mechanism to accomplish final classification.
Preferably; As shown in Figure 1; Said material dispersion area 40 comprises high-pressure injection airduct 41, a pan feeding member 42 and disperses member 43; The pipe shaft that the discharging opening of said pan feeding member 42 is a skewed and said high-pressure injection airduct 41 intersects, said dispersion member 43 be arranged on high-pressure injection airduct 41 and pan feeding member 42 intersections, along the pipe shaft front side of air-flow direction of advance, the inner chamber of said dispersion member 43 is that to be convenient to the material collision hemispherical so that material disperses; Disperse the feeding mouth of member 43 to be connected with a high-pressure injection airduct 41, the discharging opening of dispersion member 43 passes feed bin 51 and is set to towards 360 degree loopfuls to cloth wind material-feeding mechanism.
Preferably; As shown in Figure 2; Said 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, is evenly equipped with the sieve aperture of being convenient to go out from the wind that the air-supply arrangement place sends here on the said pneumatic jig 10, and the upper surface of pneumatic jig 10 is set to be convenient to material landing skewed on pneumatic jig; The positive downside of said pneumatic jig 10 is provided with stage isolation groove 53; The upside of stage isolation groove 53 is the uncovered shape of adjustable size; And the uncovered edge of stage isolation groove 53 stretches out the outside in the lower peripheral edge of pneumatic jig 10; The following side outlet of stage isolation groove 53 is connected with coarse granule drainage conduit 54; Be provided with the passage that fine granular materials of confession passes through between the inwall of the cell wall of said stage isolation groove 53 and feed bin 51, the following side outlet of said feed bin 51 is connected through the feeding mouth of fine grained drainage conduit 57 with secondary graded region 60.
The upside of stage isolation groove 53 is the uncovered shape of adjustable size; Be for the ease of material is carried out classification; As when the upside of stage isolation groove 53 uncovered hour; Have only the bigger coarse granule material of particle diameter can fall into stage isolation groove 53 this moment, and most of material then falls into the passage between the inwall of cell wall and feed bin 51 of stage isolation groove 53 as fine granular materials.The uncovered opening that also can make fixed size of upside of certain stage isolation groove 53.
Preferably, said pneumatic jig 10 is coniform, and pneumatic jig 10 is surrounded by horizontal grating 11 and vertical grating 12 and forms; Said vertical grating 12 under the top of coniform pneumatic jig 10 is oblique, be radial cloth be made as a plurality of, said 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 said horizontal grating 11 is, and laterally the incline direction of the upper surface of incline direction and the pneumatic jig 10 of grating 11 upper surfaces matches.
Also promptly as shown in Figure 3, said pneumatic jig 10 is the conical compass screen surfaces that surrounded by horizontal grating 11 and vertical grating 12, constitutes cloth wind gap 13 between the two adjacent transverse gratings 11.The cross section of said horizontal grating 11 is smooth fan-shaped cambered surface; Said fan-shaped one side contacts with vertical grating 12; Fan-shaped another side extends to the outside of pneumatic jig 10; Thereby make that the fan-shaped cambered surface of horizontal grating 11 is oblique crooked down along compass screen surface, this frame mode helps the collision dispersion that wet stock gathers group when avoiding fine to stop up.
As shown in Figure 2, the drift angle angle beta of said coniform pneumatic jig 10 gathers mass contg according to screen length, raw meal particle size demand and wet stock and is chosen between 60 °~120 °.
Preferably, like Fig. 2,4, shown in 5, said air-supply arrangement comprises the air feed post 20 of vertical shape, and the revolution center line of the axis of said air feed post 20 and pneumatic jig 10 coincides; The lower end of said air feed post 20 is an air intake, and the upper end of air feed post 20 links to each other with the bottom surface of pneumatic jig 10, and the epimere shaft that is positioned at pneumatic jig 10 masked areas of air feed post 20 is provided with air supply hole 21.
The aperture of said air supply hole 21 is identical, and is arranged in air feed post 20 all sides and is in the air supply hole 21 common formation hoop air supply hole groups on the same horizontal direction along hoop, and said air supply hole group uniformly-spaced is arranged on the shaft of air feed post 20 from top to bottom.
Like Fig. 4, shown in 5, the air supply hole 21 of said air feed post 20 is spaced six in that 360 ° of directions of level are first-class, and the quantity of air supply hole 21 can increase or reduce as required, and said six air supply holes 21 constitute 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 said hoop air feed post group can increase as required, thereby improves the uniformity of cloth wind.
Further; Said air-supply arrangement also comprise match with air feed post 20 so that loopful to the ventilating duct 30 of cloth wind; One end and the air feed post 20 of said ventilating duct 30 are connected; And the air inlet 34 of ventilating duct 30 is connected with said air supply hole 21, and the end away from air supply hole 21 of ventilating duct 30 also is the cloth wind gap 13 that the air outlet of ventilating duct 30 is set to formation between horizontal grating 11.
Preferably; Said ventilating duct 30 is corresponding one by one with air supply hole 21; Said ventilating duct 30 is the fan shape that is 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 said pneumatic jig 10; The base spacer of ventilating duct that is in upside is all identical with shape with the roof spacer size of the adjacent ventilating duct that is in downside, and this base spacer therewith roof spacer be connected with each other.
As shown in Figure 7, the upper and lower surfaces of said ventilating duct 30 is the identical sallop screen of angle, and ventilating duct 30 is through being bolted on the air feed post 20, and the air inlet 34 of ventilating duct 30 overlaps with air feed mouth 21 on the air feed post 20.
As shown in Figure 7, the specification that is in the ventilating duct 30 on the same horizontal level is identical, and the base spacer 312 of ventilating duct 30 on radical length greater than roof spacer 311, thereby being convenient to realize contacts with the tight of skewed compass screen surface.
As preferred version of the present invention, the air inlet place of said ventilating duct 30 is provided with the wind-guiding screen 33 of being convenient to realize even distributing wind in the ventilating duct 30.
Further; As shown in Figure 9; Said wind-guiding screen 33 is flat tabular, and the end near said air supply hole 21 of wind-guiding screen 33 to be a side be that plane, opposite side are the chock shape on inclined-plane, the inclined-plane side of the chock shape end of said wind-guiding screen 33 is set to the barrel medial surface towards ventilating duct 30.
Further, the plate face of said wind-guiding screen 33 is parallel, and the end flush away from the air inlet of ventilating duct 30 of wind-guiding screen; 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 from the air inlet middle part of ventilating duct 30 distance between plates of two adjacent wind-guiding screens gradually from the air inlet of ventilating duct 30 middle part.
As shown in Figure 8; Said wind-guiding screen 33 places in the 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 places ventilating duct air inlet 34 1 sides of wind-guiding screen 33 is at an angle ramped shaped or chock shape with lower surface.Because the central speed of the classification wind that is got into by ventilating duct air inlet 34 is big, and the peripheral direction wind speed is little, so the spacing of each wind-guiding screen 33 increases by the middle mind-set both sides of classification wind gradually, thereby classification wind is carried out 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 from the air inlet middle part of ventilating duct 30 gradually.
Be provided with the stator of strap bolt around said ventilating duct air inlet 34 and air supply hole 21 contact jaws, ventilating duct 30 is connected fixing with air feed post 20 through bolt, add gasket seal in case leak-stopping wind at stator and air feed post 20 contacted places.
In scalping district 50, material falls from the upside of coniform pneumatic jig 10 because the upper surface of pneumatic jig 10 is skewed, the wet stock that therefore gathers group along the upper surface of pneumatic jig 10 drop down and constantly with the compass screen surface collision, with the even distribution of realization material; Simultaneously because 360 degree loopfuls can realize to the comprehensive of pneumatic jig 10 and not have the air feed at dead angle that so material receives the impact of the air-flow that air-supply arrangement sees off and obtains further effectively disperseing when dropping down to the air-supply arrangement of cloth wind; Setting through the cloth wind gap 13 between the adjacent transverse grating 11; Avoided the obstruction of thin material effectively; The size of the total wind supply quantity through regulating 20 inputs of air feed post is to regulate the wind-force size; Can effectively solve the bed uneven phenomenon that occurs in the classification process, realize evenly and cloth wind, cloth efficiently, thereby realize high-effective classifying material.
Like Fig. 1, shown in 10, the wind-force rotation in the said secondary graded region 60 drives stock grading district and the blanking district that classification mechanism comprises closed; Said stock grading district comprises that secondary high-pressure sprays airduct 61, bend pipe buffer component 62 and wind deflector 63; The pipe shaft that said secondary high-pressure sprays airduct 61 is provided with the feeding mouth that is 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, and said wind deflector 63 is smooth curved arc shape and is provided with a plurality ofly, and the zone that a plurality of wind deflectors 63 are surrounded constitutes stock grading district discharge end 65; Constitute the air-guiding aisle that leads to stock grading district discharge end 65 between the adjacent wind deflector, and the top of the air intake of said air-guiding aisle is provided with pore 64; Said stock grading district discharge end 65 is connected with the blanking district.
Further; As shown in Figure 1; Said blanking district comprises classification storehouse 69, is provided with blanking barrel 66 in the classification storehouse 69, and 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 said blanking barrel 66 is positioned at the inboard of the edge of opening of stock grading district discharge end 65; The inside of said blanking barrel 66 constitutes the fine granular materials blanking district 67 that supplies the secondary fine granular materials to pass through, and constitutes the coarse granule material blanking district 68 that supplies secondary coarse granule material to pass through between the inwall in the outer wall of blanking barrel 66 and classification storehouse 69; The discharging opening place of said blanking barrel 66 is provided with air exhauster.
Below in conjunction with Fig. 1 the course of work of the present invention is further specified:
The present invention includes material dispersion area 40, scalping district 50 and secondary graded region 60.
Said material dispersion area 40 is positioned at the top of powder remover, and it comprises high-pressure injection airduct 41, a pan feeding member 42 and disperse member 43 that material is able to once disperse in material dispersion area 40.
Scalping district 50 is between material dispersion area 40 and secondary graded region 60, and it comprises the feed bin 51 that has exhaust outlet 52, is provided with air-supply arrangement and the stage isolation groove 53 of pneumatic jig 10,360 degree loopfuls to cloth wind in the feed bin 51; Cone shape pneumatic jig 10 is the tapered compass screen surfaces that surrounded by horizontal grating 11 and vertical grating 12, constitutes cloth wind gap 13 between the two adjacent horizontal gratings 11, said pneumatic jig 10 place air-supply arrangement above; 360 degree loopfuls then are to be made up 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 evenly be placed with on the epimere shaft of air feed post 10 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 surfaces of ventilating duct 30 is the identical sallop screen of angle, and ventilating duct 30 is through being bolted on the air feed post 20, and air supply hole 21 coincides on the air inlet 34 of ventilating duct 30 and the air feed post 20; The air inlet place of said ventilating duct 30 is provided with the wind-guiding screen 33 of being convenient to realize even distributing wind in the ventilating duct 30; 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 through adjustable hinge 55 with coarse granule drainage conduit 54, and feed bin 51 then links to each other with the feeding mouth that the secondary high-pressure of secondary graded region 60 sprays airduct 61 through the fine grained drainage conduit 57 of its bottom.
Secondary graded region 60 is positioned at the downside in scalping district 50; Secondary graded region 60 comprises stock grading district that is positioned at upside and the blanking district that is positioned at downside; Said stock grading district comprises that secondary high-pressure sprays airduct 61, bend pipe buffer component 62 and wind deflector 63, and the central region that a plurality of wind deflectors 63 surround constitutes stock grading district discharge end 65; Said blanking district comprises classification storehouse 69, is provided with blanking barrel 66 in the classification storehouse 69, and the uncovered outlet with stock grading district discharge end 65 of the upside of blanking barrel 66 is connected.
Concrete classification shedding process is following:
As shown in Figure 1; Material also is that feed chute gets into a high-pressure injection airduct 41 by pan feeding member 42; Under the effect of penetrating of dashing of high-pressure blast; Material enters into the hemispherical inner chamber that disperses member 43, and the wall collision of material and the hemispherical inner chamber that disperses member 43 to be once disperseing, because the particulate that the effect of sticking forms gathers and in this process, fully disperseed.
The top of the material vertical drop after the dispersion to coniform pneumatic jig 10; Material is being able to evenly dispersion to accomplish the secondary dispersion in the dropping process of coniform pneumatic jig 10 compass screen surfaces; Ventilating duct 20 providers of coniform pneumatic jig 10 downsides are to the oblique following and adjustable classification wind of intensity simultaneously; Material receive through cloth wind gap 13 also be sieve aperture classification wind flushing action and obtain separating, the classification wind of dust granules is carried in the air exhauster that link to each other with exhaust outlet 52 this moment eliminating in time.Coal ash content in the separating particles is low; Density is close; Thickness particle wherein is according to the difference of its weight and the distance of the pneumatic jig compass screen surface that blown off is also inequality, and the coarse granule material that weight is big 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 then falls into the passage of the inwall formation of stage isolation groove 53 and feed bin 51, and continues to fall to the feeding mouth that secondary high-pressure sprays airduct 61 through fine grained drainage conduit 57, thereby accomplishes scalping.
Get into material entering bend pipe buffer component 62 under the effect of penetrating of dashing of secondary high-pressure wind that secondary high-pressure sprays airduct 61; Bend pipe buffer component 62 is S-type; The material warp gets into the air-guiding aisle that wind deflector 63 constitutes along the tangential direction of wind deflector 63 immediately; This moment, classification under action of centrifugal force obtained secondary coarse granule material and secondary fine granular materials; Wherein discharge end 65 gets into the inboard of blanking barrel 66 through the stock grading district under the suction function of secondary fine granular materials in blanking barrel 66, and is discharged from the back collection; Secondary coarse granule material is discharged from after then falling into the coarse granule material blanking district 68 that constitutes between the inwall in outer wall and classification storehouse 69 of blanking barrel 66, thereby accomplishes the secondary classification.

Claims (10)

1. air current classifying powder remover before a kind thermal coal selects efficiently is characterized in that comprising following part:
Material dispersion area (40) is used to make material to penetrate down dashing of air-flow and after the collision effect, disperses each other, and the material after the dispersion gets into the scalping district;
Scalping district (50); The scalping district comprises feed bin (51); Feed bin (51) is provided with exhaust outlet (52), is provided with 360 degree loopfuls in the feed bin (51) to cloth wind material-feeding mechanism, and the material after the dispersion is divided into a fine granular materials and a coarse granule material through 360 degree loopfuls to cloth wind material-feeding mechanism; A said fine granular materials gets into the secondary graded region to carry out further classification, and a said coarse granule material is discharged feed bin (51) through coarse granule drainage conduit (54);
Secondary graded region (60); Be provided with the wind-force rotation in the secondary graded region and drive classification mechanism; A said fine granular materials drives classification mechanism through the wind-force rotation and is divided into secondary fine granular materials and secondary coarse granule material, and said secondary fine granular materials and secondary coarse granule material are discharged the wind-force rotation respectively and driven classification mechanism to accomplish final classification.
2. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 1; It is characterized in that: said material dispersion area (40) comprises a high-pressure injection airduct (41), pan feeding member (42) and disperses member (43); The pipe shaft that the discharging opening of said pan feeding member (42) is a skewed and said high-pressure injection airduct (41) intersects; Said dispersion member (43) be arranged on a high-pressure injection airduct (41) and pan feeding member (42) intersection, along the pipe shaft front side of air-flow direction of advance; The inner chamber of said dispersion member (43) is that to be convenient to that material collides each other hemispherical so that material disperses; Disperse the feeding mouth of member (43) to be connected with a high-pressure injection airduct (41), the discharging opening of dispersion member (43) passes feed bin (51) and is set to towards 360 degree loopfuls to cloth wind material-feeding mechanism.
3. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 2; It is characterized in that: said 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 the air-supply arrangement of 360 degree loopfuls to cloth wind; Be evenly equipped with the sieve aperture of being convenient to go out on the said pneumatic jig (10), and the upper surface of pneumatic jig (10) is set to be convenient to material landing skewed on pneumatic jig from the wind that the air-supply arrangement place sends here; The positive downside of said pneumatic jig (10) is provided with stage isolation groove (53); The upside of stage isolation groove (53) is the uncovered shape of adjustable size; And the uncovered edge of stage isolation groove (53) stretches out the outside in the lower peripheral edge of pneumatic jig (10); The following side outlet of stage isolation groove (53) is connected with coarse granule drainage conduit (54); Be provided with the passage that fine granular materials of confession passes through between the inwall of the cell wall of said stage isolation groove (53) and feed bin (51), the following side outlet of said feed bin (51) is connected through the feeding mouth of fine grained drainage conduit (57) with secondary graded region (60).
4. air current classifying powder remover before the thermal coal efficiently according to claim 3 choosing, it is characterized in that: said pneumatic jig (10) is coniform, and pneumatic jig (10) is surrounded with vertical grating (12) by horizontal grating (11) and forms; Said vertical grating (12) is radial cloth and is made as a plurality of under the top of coniform pneumatic jig (10) is oblique; Said 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 said horizontal grating (11) is, and laterally the incline direction of the upper surface of incline direction and the pneumatic jig (10) of grating (11) upper surface matches.
5. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 4, it is characterized in that: said air-supply arrangement comprises the air feed post (20) of vertical shape, the revolution center line of the axis of said air feed post (20) and pneumatic jig (10) coincides; The lower end of said air feed post (20) is that air intake is connected with air feed pipe (56); The upper end of air feed post (20) links to each other with the bottom surface of pneumatic jig (10), and the epimere shaft that is positioned at pneumatic jig (10) masked areas of air feed post (20) is provided with air supply hole (21); Said 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 said ventilating duct (30) and air feed post (20) are connected; And the air inlet of ventilating duct (30) is connected with said air supply hole (21), and the end away from air supply hole (21) of ventilating duct (30) also is the cloth wind gap that the air outlet of ventilating duct (30) is set to formation between horizontal grating (11).
6. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 5; It is characterized in that: the aperture of said air supply hole (21) is identical; And be arranged in all sides of air feed post (20) and the air supply hole (21) that is on the same horizontal direction constitutes hoop air supply hole group jointly along hoop, said air supply hole group uniformly-spaced is arranged on the shaft of air feed post (20) from top to bottom; Said ventilating duct (30) is corresponding one by one with air supply hole (21); Said ventilating duct (30) is the fan shape that is 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 said pneumatic jig (10); The base spacer of ventilating duct that is in upside is all identical with shape with the roof spacer size of the adjacent ventilating duct that is in downside, and this base spacer therewith roof spacer be connected with each other.
7. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 5, it is characterized in that: the air inlet place of said ventilating duct (30) is provided with the wind-guiding screen (33) of being convenient to realize even distributing wind in the ventilating duct.
8. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 7; It is characterized in that: said wind-guiding screen (33) is flat tabular; And it is that plane, opposite side are the chock shape on inclined-plane that the end near said air supply hole (21) of wind-guiding screen (33) is a side, and the inclined-plane side of the chock shape end of said wind-guiding screen (33) is set to the barrel medial surface towards ventilating duct (30); The plate face of said wind-guiding screen (33) is parallel, and an end flush of the air inlet away from ventilating duct (30) of wind-guiding screen (33) (34); 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) from the air inlet middle part of ventilating duct (30) distance between plates of two adjacent wind-guiding screens gradually from the air inlet of ventilating duct (30) middle part.
9. according to air current classifying powder remover before each described choosing of thermal coal efficiently of claim 3~8, it is characterized in that: the wind-force rotation in the said secondary graded region (60) drives stock grading district and the blanking district that classification mechanism comprises closed; Said stock grading district comprises that secondary high-pressure sprays airduct (61), bend pipe buffer component (62) and wind deflector (63); The pipe shaft that said secondary high-pressure sprays airduct (61) is provided with the feeding mouth that is 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; Said wind deflector (63) is smooth curved arc shape and is provided with a plurality of; The zone that a plurality of wind deflectors (63) are surrounded constitutes stock grading district's discharge end (65), constitute the air-guiding aisle that leads to stock grading district discharge end (65) between the adjacent wind deflector, and the top of the air intake of said air-guiding aisle is provided with pore (64); Said stock grading district discharge end (65) is connected with the blanking district.
10. air current classifying powder remover before the choosing of thermal coal efficiently according to claim 9; It is characterized in that: said blanking district comprises classification storehouse (69); Be provided with blanking barrel (66) in the classification storehouse (69); 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 said blanking barrel (66) is positioned at the inboard of the edge of opening of stock grading district discharge end (65); The inside of said blanking barrel (66) constitutes the fine granular materials blanking district (67) that supplies the secondary fine granular materials to pass through, and constitutes the coarse granule material blanking district (68) that supplies secondary coarse granule material to pass through between the inwall of the outer wall of blanking barrel (66) and classification storehouse (69); The discharging opening place of said blanking barrel (66) is provided with and makes blanking barrel (66) inside be the air exhauster of negative pressure region.
CN201210264403.8A 2012-07-27 2012-07-27 Efficient airflow classification fine-coal remover for power coal before selecting Expired - Fee Related CN102784757B (en)

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CN104174591A (en) * 2014-08-21 2014-12-03 龙建明 Novel combined screening machine
CN107125341A (en) * 2017-04-28 2017-09-05 重庆毓堡农业开发有限责任公司 Tealeaves dispersion machine
CN108569929A (en) * 2018-05-15 2018-09-25 平罗县祥美化工有限公司 Nitriding furnace roof material distributing method and its equipment for the production of lime nitrogen multifunctional fertilizer
CN113058853A (en) * 2021-05-18 2021-07-02 王泽东 Fine grain wind screen

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CN113058853A (en) * 2021-05-18 2021-07-02 王泽东 Fine grain wind screen

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