CN104596233A - Self-sealing type low-rank coal and coal slime negative pressure drying device - Google Patents
Self-sealing type low-rank coal and coal slime negative pressure drying device Download PDFInfo
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- CN104596233A CN104596233A CN201510074576.7A CN201510074576A CN104596233A CN 104596233 A CN104596233 A CN 104596233A CN 201510074576 A CN201510074576 A CN 201510074576A CN 104596233 A CN104596233 A CN 104596233A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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Abstract
The invention discloses a self-sealing type low-rank coal and coal slime negative pressure drying device. The self-sealing type low-rank coal and coal slime negative pressure drying device comprises a spiral feeder, a drying barrel and a spiral discharger which are connected in sequence in a matched manner, wherein the spiral feeder is provided with a feeding opening; the spiral discharger is provided with a material outlet; spiral blades in the spiral feeder and the spiral discharger are fixedly connected with a central hot air pipe; coal scrapers achieving stirring and loosening effects are uniformly arranged around the inner wall of the drying barrel at equal intervals; heat exchange pipes for supplying heat needed by coal drying are arranged in the drying barrel; the spiral discharger is provided with a vapor discharging opening; the vapor discharging opening is connected with a dust collection device through a vacuum pump. The negative pressure drying device is ingenious in structural design; by the use of a spiral extruder type structure, continuous feeding and continuous discharging of coal are realized, and a self-sealing state of the drying device is achieved; due to the adoption of an indirect heating mode, the device has the advantages of preventing high-temperature spontaneous combustion and avoiding explosion; furthermore, water in a coal material can be further removed efficiently and quickly.
Description
Technical field
The present invention relates to a kind of self-sealed low-order coal and coal slime negative pressure drying device, belong to coal drying equipment technical field.
Background technology
Low-order coal is mainly brown coal, jet coal, dross coal, weakly caking coal etc., and because its degree of coalification is low, hole is flourishing, and water content higher (being generally 30%-50%), calorific value is low, but its fugitive constituent is high, and burning-point is low.Coal slime is that coal produces in cracking and sorting process, usually needs through flotation and press filtration, but the coal slime water content after press filtration still very high (be generally and be not less than 20%).The high-moisture of low-order coal and coal slime directly affects it and uses, transports and store.Because the moisture of coal increases, useful component reduces relatively, and moisture becomes steam when burning will absorb heat, and thus reduces the caloric value of coal; The moisture of coal increases, and also add ineffective traffic, and brings difficulty to unloading.So, in order to fully develop low-order coal and coal slime, drying process must be carried out to it.At present, domestic low-order coal and coal slime drying use cylinder drying machine usually, and adopt high-temperature hot flue gas directly to contact dehydration with coal grain, dewatering efficiency is low, Dust Capacity is large, and there is the potential safety hazards such as easy spontaneous combustion, blast.
The moisture of coal refers to the content of water in the coal of unit mass.The moisture of coal has inherent moisture and free moisture two kinds.Free moisture is attached to coal particle surface, is easy to evaporate in dry air at normal temperatures, but just no longer evaporates when being evaporated to the wetting balance of the water vapor pressure of coal particle surface and air, and free moisture also can remove by mechanical presses mode.The inherent water being arranged in coal internal capillary hole is mainly with liquid seepage flow or first evaporate the mode spread again and remove, these two kinds of dehydrated forms are all relevant with interfacial water vapor partial pressure, and under subnormal ambient, interfacial water partial vapour pressure is lower, it is larger that capillary water removes speed, in addition, according to Kelvin equation, at same dried temperature, environmental stress is lower, steam partial pressure is lower, and the coal mesopore size that can dewater is less, and it is more thorough that inherent moisture removes.So negative pressure drying environment is beneficial to that moisture in coal is efficient, the degree of depth and fast eliminating, and the heat energy needed is few.Chinese utility model patent " a kind of brown coal drying and upgrading system " (patent No.: 201020285076.0, the day for announcing: on February 16th, 2011) in the formation of airtight subnormal ambient mentioned realized by sealing material feeding end and sealing discharging end, but how feed and discharge are accomplished to seal and are not got across.Chinese invention patent application " brown coal pipe drier " (application number: 201310584790.8, publication date: on February 19th, 2014) in the negative pressure closed environment mentioned be equipped with two-stage sealing baffle by material feeding end and exhaust end and obtain, this sealing device structure is more complicated and need higher automaticity.
Summary of the invention
For the defect existed in above-mentioned prior art, the invention provides a kind of self-sealed low-order coal and coal slime negative pressure drying device, utilize the architectural feature of screw extruder, by the turnover process implementation self sealss of coal charge to obtain negative pressure closed environment, solve the technical problem that airtight subnormal ambient in low-order coal and coal slime negative pressure drying is difficult to obtain.
In order to realize object of the present invention, the invention provides two kinds of technical schemes.
The first technical scheme provided by the invention is: the present invention includes the screw feeder, drying and the discharge with endless screw device that are connected successively, screw feeder and discharge with endless screw device all comprise column part and frusto-conical portion, wherein the column part of screw feeder is connected with drying, and the frusto-conical portion of discharge with endless screw device is connected with drying;
The frusto-conical portion of screw feeder arranges feeding mouth, and the end of the column part of discharge with endless screw device arranges discharging opening;
Screw feeder and discharge with endless screw device inside arrange helical blade, and the pitch between described adjoining spiral blade is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae centrally axis direction runs through screw feeder, drying and discharge with endless screw device, and screw feeder is fixedly connected with central hot tracheae with the helical blade of discharge with endless screw device inside;
Inner at drying, at least 3 lump coal material scraper plates and centerline axis parallel are also equidistantly evenly arranged around drying inwall, and described every lump coal material scraper plate is fixedly connected with central hot tracheae by least 2 pieces of gripper shoes;
Inner at drying, U-shaped heat-exchange tube is around central hot tracheae with radial layout, and the two-port of described U-shaped heat-exchange tube is fixedly connected with central hot tracheae and through;
Helical blade, coal charge scraper plate, gripper shoe, U-shaped heat-exchange tube are connected as a whole with central hot tracheae, with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device arranges steam and arranges mouth outward, and described steam is arranged mouth outward and is connected with dust arrester by vavuum pump.
Further optimization, in the first technical scheme, the set-up mode of U-shaped heat-exchange tube is: inner at drying, centrally place's cross circular section loop wire of heating pipe arranges sealing plate at central hot pipe, described at least 3 U-shaped heat-exchange tubes are equidistantly evenly arranged around sealing plate with radial, and make the two-port of whole U-shaped heat-exchange tube be distributed in the both sides of sealing plate; According at least 3 diverse location cross circular section loop wire places of the central hot tracheae of aforementioned manner in drying inside, sealing plate and U-shaped heating pipe are set.
The second technical scheme provided by the invention is: the present invention includes the screw feeder, drying and the discharge with endless screw device that are connected successively, screw feeder and discharge with endless screw device all comprise column part and frusto-conical portion, wherein the column part of screw feeder is connected with drying, and the frusto-conical portion of discharge with endless screw device is connected with drying;
The frusto-conical portion of screw feeder arranges feeding mouth, and the end of the column part of discharge with endless screw device arranges discharging opening;
Screw feeder and discharge with endless screw device inside arrange helical blade, and the pitch between described adjoining spiral blade is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae centrally axis direction runs through screw feeder and discharge with endless screw device, and screw feeder is fixedly connected with central hot tracheae with the helical blade of discharge with endless screw device inside;
Inner at drying, drying two ends respectively arrange one with central axis upright and diameter is less than the hollow disc of drying diameter, the side that described two hollow discs are relative is fixedly connected with by straight type heat-exchange tube and through, and the opposite side of described two hollow discs to be fixedly connected with central hot tracheae and through respectively at its circle centre position;
Inner at drying, at least 3 lump coal material scraper plates and centerline axis parallel are also equidistantly evenly arranged around drying inwall, and the two ends of described every lump coal material scraper plate are fixedly connected with the edge of two hollow discs respectively;
Helical blade, coal charge scraper plate, hollow disc, straight type heat-exchange tube are connected as a whole with central hot tracheae, with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device arranges steam and arranges mouth outward, and described steam is arranged mouth outward and is connected with dust arrester by vavuum pump.
Further optimization, in the second technical scheme, the set-up mode of straight type heat-exchange tube is: described at least 3 straight type heat-exchange tubes are parallel to the center of circle connecting line of two hollow discs and are evenly arranged along the concentric circles of on hollow disc; According to the straight type heat-exchange tube of the arranged in concentric circles of aforementioned manner different-diameter along at least 3 on hollow disc.
In addition, optimize further, following technical characteristic can be suitable in first and second kinds of technical scheme:
(1) the outer wrap heat-insulation layer of drying, is wound around annular heat tracheae along drying outer wall between drying and heat-insulation layer;
(2) described coal charge scraper plate and drying inwall are at a distance of 1-10mm;
(3) inwall of described screw feeder and discharge with endless screw device and helical blade outer rim are at a distance of 5-20mm;
(4) dust arrester described in is cyclone dust collectors or wet scrubber;
(5) according to screw feeder upper and discharge with endless screw device under mode, make central hot tracheae become 5-20 ° of inclination angle with horizontal plane when described device is installed;
(6) described dynamical system comprises motor, decelerator, clutch, gear train and bearing, and dynamical system drives central hot tracheae to rotate.
Smart structural design of the present invention, utilizes the structure of screw extruder formula to realize continuous-feeding and the continuous pulp discharge of coal, and reaches the self sealss state of drying device.Coal charge enters again from column part discharge from the frusto-conical portion of screw feeder and discharge with endless screw device, moves ahead vertically under the promotion of the helical blade rotated.Due to, screw feeder and discharge with endless screw device are assigned to column part diameter from frusto-conical portion and are reduced, and the pitch between adjoining spiral blade is successively decreased gradually along the direction assigning to column part from frusto-conical portion, so coal charge is subject to the extruding force constantly increased in the process of moving ahead, finally form the cylindric coal charge be compacted being full of whole space at column part, thus the self sealss state of drying device can be realized.
Because the coal charge major part entering drying inside after screw feeder extruding becomes block, be unfavorable for the abundant drying of coal charge, so the present invention arranges coal charge scraper plate in drying inside, block coal charge disperseed.Leave after the coal charge bottom drying being risen to certain altitude by the rotation of coal charge scraper plate.Coal charge, in dropping process, collides with U-shaped heat-exchange tube or straight type heat-exchange tube and breaks, and cracked bottom drying.Through the rotation of multiple coal charge scraper plate, coal charge is constantly promoted and is left, and repeats said process, thus by fully loose.In addition, coal charge scraper plate is arranged around drying inwall, makes coal charge scraper plate and drying inwall at a distance of 1-10mm, can ensure that the coal charge bottom drying sweeps and promotes by coal charge scraper plate completely.
The present invention adopts indirect heating manner, has the advantage preventing high temperature spontaneous combustion and avoid exploding.The waste heat produced in boiler or production technology pipeline can be adopted in the present invention as thermal source, be beneficial to economize energy and reduce costs, also can specially from establishing thermal source.Central hot tracheae and annular heat tracheae are connected with thermal source and pass into hot gas.The hot gas of central hot tracheae flows into distribute heat after U-shaped heat-exchange tube or straight type heat-exchange tube, and temperature in drying is raised.In addition, the heat-insulation layer of drying outer wrap can prevent scattering and disappearing of heat, and the annular heat tracheae of winding also can distribute heat, improves the temperature in drying further.Make drying inside keep higher temperature by this indirect heating manner, the heat that in coal charge, moisture evaporation needs is provided.
Coal charge can produce a large amount of steam in dry run, so the present invention arranges steam in the frusto-conical portion of discharge with endless screw device arrange mouth outward.Steam settles down arranging the coal dust part of carrying in the process of mouth outward from drying internal flow to steam, and flows through the coal dust that dust arrester carried further and remove rear outer row completely, avoids the pollution to environment.Steam is arranged after mouth is connected with vavuum pump outward, utilizes vavuum pump the steam of drying inside can be extracted out fast.Because the two ends of drying device achieve self sealss state by screw feeder and discharge with endless screw device, so after vavuum pump draws water steam fast, make the atmospheric pressure of pressure lower than outside of drying device inside, thus form a negative pressure closed environment.
Coal charge in screw feeder after extruding, the particulate interspaces water section of originally loose coal charge can be made to be extruded to surface, more easily to remove by thermal evaporation at the temperature that drying is inner higher.In the negative pressure closed environment of drying inside, the inherent water in coal charge granule interior pore is with liquid seepage flow or first evaporate diffusion mode again and remove, and these processes are all relevant with interfacial water vapor partial pressure.Environment vacuum degree is higher, and interfacial water partial vapour pressure is less, inherent water to remove speed larger, in addition, according to Kelvin equation, at same dried temperature, environmental stress is lower, steam partial pressure is lower, and the coal mesopore size that can dewater is less, and it is more thorough that inherent moisture removes.By the peptizaiton of coal charge scraper plate, make block coal charge become loose in the process promoted and leave, add the heating surface area of coal charge, accelerate abundant, the rapid evaporation of moisture in coal charge.By vavuum pump, steam is extracted out fast, reduce the steam partial pressure on coal charge surface, also can promote the evaporation process of moisture.Comprehensive above various effect, not only the drying device in the present invention can remove the free moisture in coal but also can remove inherent moisture, achieve efficient, the degree of depth and the fast eliminating of moisture in coal charge.
Drying device according to screw feeder upper discharge with endless screw device under angled manner install, can rely on coal charge deadweight realize flowing, save power, be convenient to the continuous operation realizing drying device, increase work efficiency.
Motor in dynamical system provides power, then the rotating speed making central hot tracheae certain by the interlock effect of decelerator, clutch, gear train and bearing rotates, thus can drive and to be linked to be overall helical blade, coal slime scraper plate, U-shaped heat-exchange tube or a straight type heat-exchange tube with central hot tracheae and hollow disc rotates with identical rotating speed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first technical scheme in the present invention.
Fig. 2 is the schematic diagram in A-A cross section in Fig. 1.
Fig. 3 is the structural representation of the second technical scheme in the present invention.
Fig. 4 is the schematic diagram in B-B cross section in Fig. 3.
Detailed description of the invention
In order to understand the present invention better, below in conjunction with accompanying drawing, the present invention is described further.
Fig. 1 and a kind of detailed description of the invention that Figure 2 shows that the first technical scheme in the present invention, comprise the screw feeder 1, drying 2 and the discharge with endless screw device 3 that are connected successively, screw feeder 1 and discharge with endless screw device 3 all comprise column part and frusto-conical portion, wherein the column part of screw feeder 1 is connected with drying 2, and the frusto-conical portion of discharge with endless screw device 3 is connected with drying 2;
The frusto-conical portion of screw feeder 1 arranges feeding mouth 12, and the end of the column part of discharge with endless screw device 3 arranges discharging opening 13;
Screw feeder 1 and discharge with endless screw device 3 inside arrange helical blade 5, and the pitch between described adjoining spiral blade 5 is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae 4 centrally axis direction runs through screw feeder 1, drying 2 and discharge with endless screw device 3, and screw feeder 1 is fixedly connected with central hot tracheae 4 with the helical blade 5 of discharge with endless screw device 3 inside;
Inner at drying 2, at least 3 lump coal material scraper plates 6 are with centerline axis parallel and be equidistantly evenly arranged around drying 2 inwall, and every lump coal material scraper plate 6 is fixedly connected with central hot tracheae 4 by least 2 pieces of gripper shoes 14;
Inner at drying 2, U-shaped heat-exchange tube 15 is around central hot tracheae 4 with radial layout, and the two-port of described U-shaped heat-exchange tube 15 is fixedly connected with central hot tracheae 4 and through;
Helical blade 5, coal charge scraper plate 6, gripper shoe 14, U-shaped heat-exchange tube 15 are connected as a whole with central hot tracheae 4, with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device 3 arranges steam and arranges mouth 7 outward, and described steam is arranged mouth 7 outward and is connected with dust arrester 9 by vavuum pump 8.
In addition, the outer wrap heat-insulation layer 10 of drying 2, is wound around annular heat tracheae 11 along drying 2 outer wall between drying 2 and heat-insulation layer 10.
Described in the first technical scheme, the set-up mode of U-shaped heat-exchange tube 15 is: inner at drying 2, centrally place's cross circular section loop wire of heating pipe 4 arranges sealing plate 16 in central hot tracheae 4 inside, described at least 3 U-shaped heat-exchange tubes 15 are equidistantly evenly arranged around sealing plate 16 with radial, and make the two-port of whole U-shaped heat-exchange tube 15 be distributed in the both sides of sealing plate 16; According at least 3 diverse location cross circular section loop wire places of the central hot tracheae 4 of aforementioned manner in drying 2 inside, sealing plate 16 and U-shaped heating pipe 15 are set.
Fig. 3 and a kind of detailed description of the invention that Figure 4 shows that the second technical scheme in the present invention, comprise the screw feeder 1, drying 2 and the discharge with endless screw device 3 that are connected successively, screw feeder 1 and discharge with endless screw device 3 comprise column part and frusto-conical portion, wherein the column part of screw feeder 1 is connected with drying 2, and the frusto-conical portion of discharge with endless screw device 3 is connected with drying 2;
The frusto-conical portion of screw feeder 1 arranges feeding mouth 12, and the end of the column part of discharge with endless screw device 3 arranges discharging opening 13;
Screw feeder 1 and discharge with endless screw device 3 inside arrange helical blade 5, and the pitch between described adjoining spiral blade 5 is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae 4 centrally axis direction runs through screw feeder 1 and discharge with endless screw device 3, and screw feeder 1 is fixedly connected with central hot tracheae 4 with the helical blade 5 of discharge with endless screw device 3 inside;
Inner at drying 2, drying 2 two ends respectively arrange one with central axis upright and diameter is less than the hollow disc 17 of drying 2 diameter, the side that described two hollow discs 17 are relative is fixedly connected with by straight type heat-exchange tube 18 and through, and the opposite side of described two hollow discs 17 to be fixedly connected with central hot tracheae 4 and through respectively at its circle centre position;
Inner at drying 2, at least 3 lump coal material scraper plates 6 are with centerline axis parallel and be equidistantly evenly arranged around drying 2 inwall, and the two ends of every lump coal material scraper plate 6 are fixedly connected with the edge of two hollow discs 17 respectively;
Helical blade 5, coal charge scraper plate 6, hollow disc 17, straight type heat-exchange tube 18 are connected as a whole with central hot tracheae 4, with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device 3 arranges steam and arranges mouth 7 outward, and described steam is arranged mouth 7 outward and is connected with dust arrester 9 by vavuum pump 8.
In addition, the outer wrap heat-insulation layer 10 of drying 2, is wound around annular heat tracheae 11 along drying 2 outer wall between drying 2 and heat-insulation layer 10.
Described in the second technical scheme, the set-up mode of straight type heat-exchange tube 18 is: described at least 3 straight type heat-exchange tubes 18 are parallel to the center of circle connecting line of two hollow discs 17 and are evenly arranged along the concentric circles of on hollow disc 17; According to the arranged in concentric circles straight type heat-exchange tube 18 of aforementioned manner along at least 3 different-diameters on hollow disc 17.
In Fig. 1, arrow is depicted as the process of circulation of hot gas in the first technical scheme.First hot gas pass into from the central hot tracheae 4 of screw feeder 1 one end, in the process of moving ahead, run into sealing plate 16 stop, hot gas is forced to enter from a port of U-shaped heat-exchange tube 15 and discharge from another port, to return in central hot tracheae 4 and to be stopped by next block sealing plate 16 again in the process of moving ahead, forcing hot gas again enter from a port of U-shaped heat-exchange tube 15 and discharge from another port; Hot gas constantly repeats said process in the process of moving ahead, and finally gets back to the central hot tracheae 4 also outer row of discharge with endless screw device 3 one end.In addition, in annular heat tracheae 11, hot gas passes into from screw feeder 1 one end, flows along annular heat tracheae 11, finally discharges from discharge with endless screw device 3 one end.
In Fig. 3, arrow is depicted as the process of circulation of hot gas in the second technical scheme: first hot gas pass into from the central hot tracheae 4 of screw feeder 1 one end, then enter in the hollow disc 17 of screw feeder 1 one end, in hollow disc 17, hot gas is subject to stop and spreads out, and enters respectively in different straight type heat-exchange tubes 18.Hot gas is pooled in the hollow disc 17 of discharge with endless screw device 3 one end after flowing out from straight type heat-exchange tube 18, finally enters also outer in the central hot tracheae 4 of discharge with endless screw device 3 one end row.In addition, in annular heat tracheae 11, hot gas passes into from screw feeder 1 one end, flows along belt heating pipe 11, finally discharges from discharge with endless screw device 3 one end.
In the first and the second technical scheme, the course of work of drying device is as follows:
(1) first start dynamical system, central hot tracheae 4, helical blade 5, U-shaped heat-exchange tube 15 or straight type heat-exchange tube 18 and hollow disc 17 are rotated.Hot gas is passed in central hot tracheae 4 and annular heat tracheae 11, flow through drying device according to the process of circulation of above-mentioned hot gas, make drying 2 inside keep higher temperature, the heat needed for dry coal charge is provided.
(2) by below granularity 13mm and the coal charge of water content more than 20% enters drying device through the feeding mouth 12 of screw feeder 1.In the rotary course of the helical blade 5 of screw feeder 1, assign to column part coal charge from frusto-conical portion to be pushed and to move ahead and be squeezed, finally form at the column part of screw feeder 1 the cylindric coal charge be compacted being full of whole space, thus serve self sealing action.Because coal charge feeds continuously, so can continue to keep self sealss state.Coal charge in screw feeder 1 through extruding after, coal charge particulate interspaces water section can be made to be extruded out, can more easily to remove by thermal evaporation under entering the higher temperature environment in drying 2 inside.
(3) coal charge enters drying 2 inside after screw feeder 1 extrudes, now the bulk of coal charge major part for being compacted.In the rotary course of coal charge scraper plate 6, the coal charge bottom drying 2 leaves after drying 2 inwall is thus lifted to certain altitude.Coal charge, in dropping process, collides with U-shaped heat-exchange tube 15 or straight type heat-exchange tube 18 and breaks, and cracked bottom drying 2.Through the rotation of multiple coal charge scraper plate 6, coal charge is constantly promoted and is left, and repeats said process, thus by fully loose.In the relaxing process of coal charge, add the heating surface area of coal charge, make moisture in coal charge fully, rapid evaporation.
The steam produced in coal charge dry run is arranged mouth 7 outward by steam and is arranged outward after the coal dust that dust arrester 9 is carried removes completely.Steam is arranged after mouth 7 is connected with vavuum pump 8 outward, utilizes vavuum pump 8 steam of drying 2 inside can be extracted out fast.Because the two ends of drying device achieve self sealss state by screw feeder 1 and discharge with endless screw device 3, so after vavuum pump 8 draws water steam fast, make the atmospheric pressure of pressure lower than outside of drying device inside, thus define a negative pressure closed environment.In the negative pressure closed environment of drying 2 inside, the inherent water in coal charge granule interior pore is with liquid seepage flow or first evaporate diffusion mode again and remove, and these processes are all relevant with interfacial water vapor partial pressure.Environment vacuum degree is higher, and interfacial water partial vapour pressure is less, inherent water to remove speed larger, in addition, according to Kelvin equation, at same dried temperature, environmental stress is lower, steam partial pressure is lower, and the coal mesopore size that can dewater is less, and it is more thorough that inherent moisture removes.So the negative pressure drying environment in drying 2 makes that moisture in coal charge is efficient, the degree of depth and fast eliminating, and the heat energy needed is few.
(4) coal charge enters discharge with endless screw device 3 in drying 2 inside after loose and drying.In the rotary course of the helical blade 5 of discharge with endless screw device 3, assign to column part coal charge from frusto-conical portion to be again pushed and to move ahead and be squeezed, form at the column part of discharge with endless screw device 3 the cylindric coal charge be compacted being full of whole space, thus serve self sealing action.Because coal charge is discharged continuously, so can continue to keep self sealss state.Finally, coal charge is discharged from the discharging opening 13 of discharge with endless screw device 3, makes its water content be reduced to less than 10%.
Finally it should be noted that; above word and drawings describe key structural feature of the present invention and operation principle; but those skilled in the art should understand; the present invention by above-mentioned detailed description of the invention restriction; under the prerequisite not departing from Basic Design of the present invention design, the various deformation mode done the present invention also should in protection domain of the present invention.
Claims (10)
1. a self-sealed low-order coal and coal slime negative pressure drying device, comprise the screw feeder (1), drying (2) and the discharge with endless screw device (3) that are connected successively, it is characterized in that: screw feeder (1) and discharge with endless screw device (3) all comprise column part and frusto-conical portion, wherein the column part of screw feeder (1) is connected with drying (2), and the frusto-conical portion of discharge with endless screw device (3) is connected with drying (2);
The frusto-conical portion of screw feeder (1) arranges feeding mouth (12), and the end of the column part of discharge with endless screw device (3) arranges discharging opening (13);
Screw feeder (1) and discharge with endless screw device (3) inside arrange helical blade (5), and the pitch between described adjoining spiral blade (5) is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae (4) centrally axis direction runs through screw feeder (1), drying (2) and discharge with endless screw device (3), and screw feeder (1) is all fixedly connected with central hot tracheae (4) with the helical blade (5) of discharge with endless screw device (3) inside;
Inner at drying (2), at least 3 lump coal material scraper plates (6) are with centerline axis parallel and be equidistantly evenly arranged around drying (2) inwall, and described every lump coal material scraper plate (6) is fixedly connected with central hot tracheae (4) by least 2 pieces of gripper shoes (14);
Inner at drying (2), U-shaped heat-exchange tube (15) is around central hot tracheae (4) with radial layout, and the two-port of described U-shaped heat-exchange tube (15) is fixedly connected with central hot tracheae (4) and through;
Helical blade (5), coal charge scraper plate (6), gripper shoe (14), U-shaped heat-exchange tube (15) are connected as a whole with central hot tracheae (4), with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device (3) arranges steam and arranges mouth (7) outward, and described steam is arranged mouth (7) outward and is connected with dust arrester (9) by vavuum pump (8).
2. the self-sealed low-order coal of one according to claim 1 and coal slime negative pressure drying device, it is characterized in that: inner at drying (2), centrally place's cross circular section loop wire of heating pipe (4) arranges sealing plate (16) in central hot tracheae (4) inside, described at least 3 U-shaped heat-exchange tubes (15) are equidistantly evenly arranged around sealing plate (16) with radial, and make the two-port of whole U-shaped heat-exchange tube (15) be distributed in the both sides of sealing plate (16); According to aforementioned manner, sealing plate (16) and U-shaped heating pipe (15) are set at least 3 diverse location cross circular section loop wire places of the central hot tracheae (4) of drying (2) inside.
3. a self-sealed low-order coal and coal slime negative pressure drying device, comprise the screw feeder (1), drying (2) and the discharge with endless screw device (3) that are connected successively, it is characterized in that: screw feeder (1) and discharge with endless screw device (3) all comprise column part and frusto-conical portion, wherein the column part of screw feeder (1) is connected with drying (2), and the frusto-conical portion of discharge with endless screw device (3) is connected with drying (2);
The frusto-conical portion of screw feeder (1) arranges feeding mouth (12), and the end of the column part of discharge with endless screw device (3) arranges discharging opening (13);
Screw feeder (1) and discharge with endless screw device (3) inside arrange helical blade (5), and the pitch between described adjoining spiral blade (5) is successively decreased gradually along the direction assigning to column part from frusto-conical portion;
Central hot tracheae (4) centrally axis direction runs through screw feeder (1) and discharge with endless screw device (3), and screw feeder (1) is all fixedly connected with central hot tracheae (4) with the helical blade (5) of discharge with endless screw device (3) inside;
Inner at drying (2), drying (2) two ends respectively arrange one with central axis upright and diameter is less than the hollow disc (17) of drying (2) diameter, the relative side of described two hollow discs (17) is fixedly connected with by straight type heat-exchange tube (18) and through, and the opposite side of described two hollow discs (17) to be fixedly connected with central hot tracheae (4) and through respectively at its circle centre position;
Inner at drying (2), at least 3 lump coal material scraper plates (6) are with centerline axis parallel and be equidistantly evenly arranged around drying (2) inwall, and the two ends of described every lump coal material scraper plate (6) are fixedly connected with the edge of two hollow discs (17) respectively;
Helical blade (5), coal charge scraper plate (6), hollow disc (17), straight type heat-exchange tube (18) are connected as a whole with central hot tracheae (4), with identical rotating speed rotary motion under the driving of dynamical system;
The frusto-conical portion of discharge with endless screw device (3) arranges steam and arranges mouth (7) outward, and described steam is arranged mouth (7) outward and is connected with dust arrester (9) by vavuum pump (8).
4. the self-sealed low-order coal of one according to claim 3 and coal slime negative pressure drying device, is characterized in that: described at least 3 straight type heat-exchange tubes (18) are parallel to the center of circle connecting line of two hollow discs (17) and are evenly arranged along a concentric circles on hollow disc (17); According to the arranged in concentric circles straight type heat-exchange tube (18) of aforementioned manner along at least 3 different-diameters on hollow disc (17).
5. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, it is characterized in that: drying (2) outer wrap heat-insulation layer (10), between drying (2) and heat-insulation layer (10), be wound around annular heat tracheae (11) along drying (2) outer wall.
6. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, is characterized in that: described coal charge scraper plate (6) and drying (2) inwall are at a distance of 1-10mm.
7. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, is characterized in that: the inwall of described screw feeder (1) and discharge with endless screw device (3) and helical blade (5) outer rim are at a distance of 5-20mm.
8. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, is characterized in that: described dust arrester (9) is cyclone dust collectors or wet scrubber.
9. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, it is characterized in that: according to screw feeder (1) upper and discharge with endless screw device (3) under mode, described device makes central hot tracheae (4) become 5-20 ° of inclination angle with horizontal plane when mounted.
10. the self-sealed low-order coal of the one according to any one of claim 1-4 and coal slime negative pressure drying device, it is characterized in that: described dynamical system comprises motor, decelerator, clutch, gear train and bearing, dynamical system drives central hot tracheae (4) to rotate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510074576.7A CN104596233B (en) | 2015-02-12 | 2015-02-12 | A kind of self-sealed low-order coal and coal slime negative pressure drying device |
| CN201610233011.3A CN105841478B (en) | 2015-02-12 | 2015-02-12 | Self-sealed low-order coal negative pressure drying device |
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| CN201510074576.7A CN104596233B (en) | 2015-02-12 | 2015-02-12 | A kind of self-sealed low-order coal and coal slime negative pressure drying device |
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| CN201610233011.3A Division CN105841478B (en) | 2015-02-12 | 2015-02-12 | Self-sealed low-order coal negative pressure drying device |
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| CN201510074576.7A Expired - Fee Related CN104596233B (en) | 2015-02-12 | 2015-02-12 | A kind of self-sealed low-order coal and coal slime negative pressure drying device |
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| CN107621123A (en) * | 2017-10-25 | 2018-01-23 | 湖南辉讯企业管理有限公司 | A kind of pressure-bearing type processing of crude drugs drying unit |
| CN109401774A (en) * | 2018-12-04 | 2019-03-01 | 青岛伊克斯达智能装备有限公司 | The continuous thermal splitting system of waste plastics and its thermal-cracking method |
| CN109609155A (en) * | 2019-01-11 | 2019-04-12 | 扬州工业职业技术学院 | A kind of biomass carbonated feeding device |
| CN114646196A (en) * | 2022-05-23 | 2022-06-21 | 徐州杰富润机电设备有限公司 | High-efficiency low-energy-consumption coal slime feeding, drying and dewatering equipment |
| CN115585639A (en) * | 2022-10-19 | 2023-01-10 | 国能民权热电有限公司 | Coal slime drying device |
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| CN107144106B (en) * | 2017-04-21 | 2019-12-27 | 北京路优材料技术有限公司 | Method for drying rock asphalt powder at ultrahigh temperature and negative pressure |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105841478B (en) | 2018-01-23 |
| CN104596233B (en) | 2016-06-15 |
| CN105841478A (en) | 2016-08-10 |
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