CN111981770B - Coal drying device for coal-fired power plant - Google Patents
Coal drying device for coal-fired power plant Download PDFInfo
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- CN111981770B CN111981770B CN202010808371.8A CN202010808371A CN111981770B CN 111981770 B CN111981770 B CN 111981770B CN 202010808371 A CN202010808371 A CN 202010808371A CN 111981770 B CN111981770 B CN 111981770B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
- F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
- B02C18/142—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with two or more inter-engaging rotatable cutter assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0463—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall
- F26B11/0477—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum
- F26B11/0486—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis having internal elements, e.g. which are being moved or rotated by means other than the rotating drum wall for mixing, stirring or conveying the materials to be dried, e.g. mounted to the wall, rotating with the drum the elements being held stationary, e.g. internal scraper blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B20/00—Combinations of machines or apparatus covered by two or more of groups F26B9/00 - F26B19/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
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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
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/02—Applications of driving mechanisms, not covered by another subclass
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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
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
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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
- F26B25/06—Chambers, containers, or receptacles
- F26B25/14—Chambers, containers, receptacles of simple construction
- F26B25/16—Chambers, containers, receptacles of simple construction mainly closed, e.g. drum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a coal drying device for a coal-fired power plant, and particularly relates to the field of coal drying. According to the invention, the waste heat recovery cylinder structure is arranged, the heat exchange tube mechanism is utilized to exchange heat of hot air in the rotary drum dryer to lead out heated fresh air, and the internal heat conduction cylinder structure is utilized to conduct the dried hot air residual heat to heat the fresh air, so that waste heat recovery is realized, the energy utilization rate is improved, and the purposes of environmental protection and emission reduction are achieved.
Description
Technical Field
The invention relates to the technical field of coal drying, in particular to a coal drying device for a coal-fired power plant.
Background
At present, coal is mainly used as combustion fuel in thermal power plants in China, the price of high-moisture coal is lower at present, more and more power plants start to co-burn the high-moisture coal, the high-moisture coal can absorb a large amount of heat absorption due to moisture vaporization when being burned in a boiler, and a series of influences can be driven to the operation of a boiler unit so as to solve the problem of a large amount of moisture contained in the coal.
At present, a large amount of coal drying devices appear, a rotary drum dryer, a vertical pipe airflow dryer and a fluidized bed dryer are mainly used, a large amount of hot air is needed for inputting, the heating efficiency of coal materials is improved by continuously raising the coal materials in the hot air to accelerate water evaporation, drying is realized, in practical use, because the traditional equipment is simple in structure and single in function, the hot air drying is released after contacting with the coal, a large amount of residual heat energy in the hot air is lost, the energy utilization rate is low, the coal is conveyed to a storage mechanism or a transportation loading mechanism through an open-air conveyor belt after the hot air drying, in the cooling process, a large amount of water vapor in the air is condensed, so that the secondary wetting of the coal is easily caused, and certain defects exist.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a coal drying device for a coal-fired power plant, which is characterized in that a waste heat recovery cylinder structure is arranged, hot air heat energy in a rotary cylinder dryer is subjected to heat exchange by a heat exchange pipe mechanism to be led out to heat fresh air, the fresh air pumped in is heated and pumped to a heat preservation conveying mechanism by a waste heat recovery cylinder, and heat preservation conveying in a sealing state is further performed by hot air in the coal conveying process, so that the problems in the background art are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal drying device for a coal-fired power plant comprises a rotary drum dryer and a hot blast stove, wherein the output end of the hot blast stove is communicated with the bottom end of the rotary drum dryer, a crushing filler hopper is fixedly arranged at one end of the rotary drum dryer, a meshing crushing mechanism is arranged inside the crushing filler hopper, a heat preservation conveying mechanism is fixedly connected at the other end of the rotary drum dryer, a waste heat recovery cylinder is fixedly arranged on the top surface of the rotary drum dryer, a drying air inlet mechanism is fixedly arranged at one end of the waste heat recovery cylinder, an air guide pipeline is fixedly connected at the other end of the waste heat recovery cylinder, the other end of the air guide pipeline is communicated with the inner cavity of the heat preservation conveying mechanism, a heat exchange pipe mechanism is fixedly arranged inside the rotary drum dryer and the waste heat recovery cylinder, the heat exchange pipe mechanism comprises a heat pipe and a heat absorption guide ring, and the heat pipe and the heat absorption guide ring are respectively positioned inside the waste heat recovery cylinder and the rotary drum dryer, the surfaces of the heat pipe and the heat absorption guide ring are respectively provided with a conduction fin and a heat absorption fin, and the heat pipe and the heat absorption guide ring are of an integrally formed structure;
the rotary drum dryer comprises a drying outer drum and a mesh grid rotary drum, wherein hot air guide cavities are formed in the inner side of the drying outer drum and the outer side of the mesh grid rotary drum, the mesh grid rotary drum is rotatably installed in the drying outer drum, one end of the mesh grid rotary drum is fixedly sleeved with a transmission gear ring positioned on the outer side of the drying outer drum, the outer side of the transmission gear ring is meshed and transmitted with a rotary driving structure, the rotary driving structure is composed of a speed reduction motor and a transmission box, a plurality of conveying blades are fixedly installed in the mesh grid rotary drum, and the conveying blades are spirally arranged;
the waste heat recovery cylinder comprises a heat insulation outer cylinder and a heat conduction cylinder, wherein slow release guide cavities are formed in the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder, a plurality of slow flow fins positioned in the slow release guide cavities are arranged on the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder and are uniformly distributed, a hot air guide hole communicated with the slow release guide cavities is formed in the top surface of the hot air guide cavities, a plurality of heat conduction fins are arranged on the inner wall of the heat conduction cylinder and are distributed on the left side and the right side of the inner wall of the heat conduction cylinder in a staggered mode, and a discharge port communicated with the slow release guide cavities is formed in the top surface of the heat insulation outer cylinder;
heat preservation conveying mechanism includes actuating mechanism, carries the auger and connects the hopper, actuating mechanism's output fixedly connected with is located carries the auger and connects the inside spiral bull stick of hopper, carry the one end of auger and connect the side fixed connection of hopper, the tip of net bars rotary drum is equipped with the return bend, the other end of return bend is linked together with the inside that connects the hopper, the discharge gate has been seted up to the bottom surface of carrying the auger other end.
The meshing and crushing mechanism comprises a driving motor and crushing roller structures, the number of the crushing rollers is two, annular crushing cutter teeth are arranged on the outer sides of the crushing rollers, the two crushing rollers are meshed with each other and rotate oppositely, and the output end of the driving motor is in transmission connection with the end portions of the crushing rollers.
The drying air inlet mechanism comprises an air pump and an air inlet pipe, the input end of the air pump is communicated with the end portion of the air inlet pipe, a drying box is clamped inside the air inlet pipe and is of a net-shaped box body structure, a drying agent is filled inside the drying box, and the drying agent is calcium oxide and calcium hydroxide mixed solid particles.
The slow flow fins on the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder are distributed in a staggered mode, and the slow flow fins, the heat conduction cylinder and the heat conduction fins are metal components.
The heat pipe and the heat absorption guide ring are respectively positioned on the inner sides of the heat conducting cylinder and the hot air guide cavity, and the heat absorption guide ring is of an arc-shaped structure.
The heat-conducting cylinder is of a sealed cylindrical structure, the output end of the drying air inlet mechanism is communicated with the inner cavity of the heat-conducting cylinder, and the other end of the heat-conducting cylinder is communicated with the end part of the air guide pipeline.
The transmission gear ring is positioned on the outer side of the drying outer barrel, the output end of the speed reducing motor is in transmission connection with the input end of the transmission box, the grid rotating barrel is of a net barrel structure, and the diameter of meshes of the grid rotating barrel is not larger than 0.3 mm.
The outer side of the rotary drum dryer is fixedly sleeved with a heat insulation interlayer, the outer side of the air guide pipeline is fixedly sleeved with a heat insulation cotton layer, the heat insulation interlayer and the heat insulation cotton layer are foam cotton members, and the heat insulation outer barrel is a rock wool member.
The invention has the technical effects and advantages that:
1. according to the invention, the waste heat recovery cylinder structure is arranged, the heat exchange tube mechanism is utilized to exchange heat of hot air in the rotary drum dryer to lead out heated fresh air, and the internal heat conduction cylinder structure is utilized to conduct the residual heat of the dried hot air to heat the fresh air, so that waste heat recovery is realized, the energy utilization rate is improved, and the purposes of environmental protection and emission reduction are achieved;
2. according to the invention, by arranging the drying air inlet mechanism and the waste heat recovery cylinder structure, fresh air pumped in by the waste heat recovery cylinder is heated and pumped to the heat-preservation conveying mechanism, and heat-preservation conveying in a sealing state is further carried out by hot air in the coal conveying process, so that secondary moisture in the coal cooling process is prevented, and the practicability of the drying device is improved;
3. according to the invention, the crushing filler hopper is arranged, the meshing crushing mechanism is utilized to shear and crush the coal material blocks, the dispersion degree of the coal material blocks is improved, the mesh grid drum drives the crushed coal to repeatedly rotate and dump, the contact effect with hot air is increased, the heating efficiency of the coal is improved, and the energy conversion efficiency and the drying effect are improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic cross-sectional view of a drum dryer and a waste heat recovery drum according to the present invention.
Fig. 3 is a schematic structural diagram of a heat conduction cylinder and a heat exchange tube mechanism of the invention.
Fig. 4 is a schematic cross-sectional structure diagram of the waste heat recovery cylinder of the present invention.
Fig. 5 is a structural schematic diagram of the heat exchange tube mechanism of the present invention.
Fig. 6 is a schematic cross-sectional view of a wire grid drum of the present invention.
Fig. 7 is a schematic view of a dry inlet configuration of the present invention.
[ reference numerals ]
1. A drum dryer; 11. drying the outer cylinder; 12. a mesh grid drum; 121. a transmission gear ring; 122. a conveying blade; 13. a hot air guide cavity; 14. a hot air guide hole;
2. a waste heat recovery cylinder; 21. a heat-insulating outer cylinder; 22. a heat conducting tube; 221. a heat conductive fin; 23. a slow release guide cavity; 24. a slow flow fin; 25. a discharge port;
3. a hot blast stove;
4. a drying air inlet mechanism; 41. an air inlet pipe; 42. drying the box;
5. crushing the filler hopper; 51. engaging the crushing mechanism;
6. an air guide duct;
7. a heat preservation conveying mechanism; 71. a drive mechanism; 72. conveying the auger; 73. a receiving hopper;
8. a heat insulation interlayer;
9. a heat exchange tube mechanism; 91. a heat pipe; 92. a conductive fin; 93. a heat absorption guide ring; 931. a heat absorbing fin.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The coal drying device for the coal-fired power plant shown in the attached figures 1-7 comprises a rotary drum dryer 1 and a hot blast stove 3, wherein the output end of the hot blast stove 3 is communicated with the bottom end of the rotary drum dryer 1, one end of the rotary drum dryer 1 is fixedly provided with a crushing filler hopper 5, the inside of the crushing filler hopper 5 is provided with a meshing crushing mechanism 51, the other end of the rotary drum dryer 1 is fixedly connected with a heat-insulating conveying mechanism 7, the top surface of the rotary drum dryer 1 is fixedly provided with a waste heat recovery cylinder 2, one end of the waste heat recovery cylinder 2 is fixedly provided with a drying air inlet mechanism 4, the other end of the waste heat recovery cylinder 2 is fixedly connected with an air guide pipeline 6, the other end of the air guide pipeline 6 is communicated with the inner cavity of the heat-insulating conveying mechanism 7, the inside of the rotary drum dryer 1 and the waste heat recovery cylinder 2 is fixedly provided with a heat exchange pipe mechanism 9, the heat exchange pipe mechanism 9 comprises a heat pipe 91 and a heat absorption guide ring 93, the heat pipe 91 and the heat absorption guide ring 93 are respectively located inside the waste heat recovery cylinder 2 and the rotary drum dryer 1, the surfaces of the heat pipe 91 and the heat absorption guide ring 93 are respectively provided with a conduction fin 92 and a heat absorption fin 931, the heat pipe 91 and the heat absorption guide ring 93 are of an integrally formed structure, the heat pipe 91 and the heat absorption guide ring 93 are respectively located on the inner sides of the heat conduction cylinder 22 and the hot air guide cavity 13, and the heat absorption guide ring 93 is of an arc-shaped structure.
As shown in fig. 2, the drum dryer 1 includes a drying outer drum 11 and a mesh grid drum 12, a hot air guide cavity 13 is disposed inside the drying outer drum 11 and outside the mesh grid drum 12, the mesh grid drum 12 is rotatably mounted inside the drying outer drum 11, a transmission gear ring 121 located outside the drying outer drum 11 is fixedly sleeved at one end of the mesh grid drum 12, a rotary driving structure is engaged and transmitted outside the transmission gear ring 121, the rotary driving structure is composed of a speed reduction motor and a transmission box, a plurality of conveying blades 122 are fixedly mounted inside the mesh grid drum 12, and the conveying blades 122 are spirally arranged.
The waste heat recovery cylinder 2 comprises a heat insulation outer cylinder 21 and a heat conduction cylinder 22, a slow release guide cavity 23 is arranged on the inner side of the heat insulation outer cylinder 21 and the outer side of the heat conduction cylinder 22, a plurality of slow flow fins 24 located inside the slow release guide cavity 23 are arranged on the inner side of the heat insulation outer cylinder 21 and the outer side of the heat conduction cylinder 22 and are uniformly distributed, a hot air guide hole 14 communicated with the slow release guide cavity 23 is formed in the top surface of the hot air guide cavity 13, a plurality of heat conduction fins 221 are arranged on the inner wall of the heat conduction cylinder 22, the heat conduction fins 221 are distributed on the left side and the right side of the inner wall of the heat conduction cylinder 22 in a staggered mode, a discharge port 25 communicated with the slow release guide cavity 23 is formed in the top surface of the heat insulation outer cylinder 21, the heat conduction cylinder 22 is of a sealed cylindrical structure, the output end of the drying air inlet mechanism 4 is communicated with the inner cavity of the heat conduction cylinder 22, and the other end of the heat conduction cylinder 22 is communicated with the end of the air guide pipeline 6.
As shown in fig. 1, the heat preservation conveying mechanism 7 comprises a driving mechanism 71, a conveying auger 72 and a material receiving hopper 73, an output end of the driving mechanism 71 is fixedly connected with a spiral rotating rod positioned inside the conveying auger 72 and the material receiving hopper 73, one end of the conveying auger 72 is fixedly connected with a side surface of the material receiving hopper 73, an end part of the mesh grid rotating cylinder 12 is provided with a bent pipe, the other end of the bent pipe is communicated with the inside of the material receiving hopper 73, and a material outlet is arranged on the bottom surface of the other end of the conveying auger 72.
The implementation mode is specifically as follows: by arranging the waste heat recovery cylinder 2 structure, the heat exchange tube mechanism 9 is utilized to exchange heat of hot air in the rotary drum dryer 1 to lead out heated fresh air, and the dried hot air residual heat is conducted to heat the fresh air through the internal heat conduction cylinder 22 structure, so that waste heat recovery is realized, the energy utilization rate is improved, and the purposes of environmental protection and emission reduction are achieved; in addition, the drying and air inlet mechanism 4 and the waste heat recovery cylinder 2 are arranged, fresh air which is pumped in is heated and pumped to the heat preservation conveying mechanism 7 by the waste heat recovery cylinder 2, heat preservation conveying in a sealing state is further carried out through hot air in the coal conveying process, secondary moisture in the coal cooling process is prevented, and the practicability of the drying device is improved.
Wherein, meshing crushing mechanism 51 includes driving motor and crushing roller structure, and the quantity of crushing roller is two, and the outside of crushing roller is equipped with cyclic annular broken sword tooth, and two crushing roller intermeshing are subtend rotation, and driving motor's output is connected with the end drive of crushing roller, realizes the breakage to coal charge piece, and coal charge drying efficiency after the breakage is higher.
As shown in fig. 4, the drying air inlet mechanism 4 includes an air pump and an air inlet pipe 41, an input end of the air pump is communicated with an end portion of the air inlet pipe 41, as shown in fig. 7, a drying box 42 is clamped inside the air inlet pipe 41, the drying box 42 is of a net-shaped box structure, a drying agent is filled inside the drying box 42, and the drying agent is a solid particle mixed by calcium oxide and calcium hydroxide, so as to pump and dry fresh air.
The slow flow fins 24 on the inner side of the heat insulation outer cylinder 21 and the outer side of the heat conduction cylinder 22 are distributed in a staggered manner, and the slow flow fins 24, the heat conduction cylinder 22 and the heat conduction fins 221 are metal components, so that the heat exchange efficiency is improved, and the heat conduction efficiency is increased.
Wherein, transmission ring gear 121 is located the outside of dry urceolus 11, and gear motor's output is connected with the input transmission of transmission case, and net bars rotary drum 12 is netted tube structure, and the mesh diameter of net bars rotary drum 12 is not more than 0.3mm, realizes empting repeatedly improving the heating efficiency to the coal charge.
Wherein, the fixed cover in the outside of rotary drum desicator 1 has connect heat preservation interlayer 8, and the fixed heat preservation cotton layer that has cup jointed in the outside of air duct 6, heat preservation interlayer 8 and heat preservation cotton layer are the foaming cotton material component, and thermal-insulated urceolus 21 is the rock wool material component, keeps warm for the device provides, prevents that the heat from volatilizing.
The working principle of the invention is as follows:
the first step is as follows: the rotary drum dryer 1 is preheated by filling fuel into the hot blast stove 3, hot air is pumped into the rotary drum dryer 1, coal blocks to be heated are filled into the mesh grid rotary drum 12 through the crushing filler hopper 5, and under the action of the meshing crushing mechanism 51, the large coal blocks are sheared and crushed through the shearing crushing roller which is relatively rotated by the meshing crushing mechanism 51, so that the coal materials are more dispersed, and the fine crushing degree of the coal materials is improved;
the second step is that: the crushed coal material slides downwards to enter the mesh grid rotary drum 12 through gravity, the rotary driving mechanism drives the mesh grid rotary drum 12 to rotate at a constant speed in the drying outer drum 11, so that the coal material is repeatedly poured and repeatedly contacted with hot air in the drying outer drum 11 to repeatedly heat the coal material, moisture in the coal material is heated up and separated out to be separated from the coal material through hot air to realize drying, the hot air conducts and heats the surface of the heat conducting ring 93 in the process of circulating in the hot air conducting cavity 13, the heat is conducted to the inside of the heat conducting drum 22 through the conduction heating of the heat pipe 91 to heat dry fresh air pumped into the heat conducting drum 22 by the drying air inlet mechanism 4, the heat conducting drum 22 is heated through the contact with the side wall of the heat conducting drum 22 in the process of discharging the hot air in the hot air conducting cavity 13, and after the residual heat of the hot air is absorbed by the heat exchange pipe mechanism 9 and the heat conducting drum 22 together, hot air is discharged through a discharge port 25 on the top surface of the waste heat recovery cylinder 2, and the heat exchange tube mechanism 9 and the heat conduction cylinder 22 heat fresh air together;
the third step: after the grid drum 12 rotates for a period of time, the rotary driving mechanism is controlled to drive the grid drum 12 to rotate reversely, the coal blocks after being dried are poured into the receiving hopper 73 under the rotating action of the conveying blades 122 and are conveyed through the conveying auger 72, in the conveying process of the conveying auger 72, the heated fresh air is pumped into the conveying auger 72 by the waste heat recovery cylinder 2, the coal blocks are further insulated and heated, part of residual moisture evaporated by coal is blown out through the discharge port of the conveying auger 72 and is further dried, and finally the dried material is conveyed to the storage equipment by the conveying auger 72 to be stored.
According to the invention, by arranging the drying air inlet mechanism and the waste heat recovery cylinder structure, the heat exchange tube mechanism is utilized to exchange heat of hot air in the rotary drum dryer to lead out heated fresh air, and the dried hot air residual heat is conducted to heat the fresh air through the internal heat conduction cylinder structure, so that waste heat recovery is realized, the energy utilization rate is improved, and the purposes of environmental protection and emission reduction are achieved; the fresh air pumped in is heated and pumped to the heat-preservation conveying mechanism by the waste heat recovery cylinder, and heat-preservation conveying in a sealing state is further carried out by hot air in the coal conveying process, so that secondary damp in the coal cooling process is prevented, and the practicability of the drying device is improved; through setting up broken hopper, utilize meshing broken mechanism to cut the breakage with the coal material piece, improve its dispersion degree to coal after driving breakage through the net bars rotary drum rotates repeatedly and dumps increase and hot-blast contact effect, improves coal efficiency of being heated, improves energy conversion efficiency and drying effect.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a coal drying device for coal-fired power plant, includes rotary drum desicator and hot-blast furnace, the output of hot-blast furnace is linked together with rotary drum desicator's bottom, its characterized in that, rotary drum desicator's one end fixed mounting has broken hopper, broken hopper's inside is equipped with meshing crushing mechanism, rotary drum desicator's other end fixedly connected with keeps warm conveying mechanism, rotary drum desicator's top surface fixed mounting has a waste heat recovery section of thick bamboo, waste heat recovery section of thick bamboo's one end fixed mounting has dry admission mechanism, waste heat recovery section of thick bamboo's other end fixedly connected with air guide pipe, the other end of air guide pipe is linked together with the inner chamber that keeps warm conveying mechanism, rotary drum desicator and waste heat recovery section of thick bamboo's inside fixed mounting has heat exchange tube mechanism, heat exchange tube mechanism includes heat pipe and heat absorption guide ring, heat pipe and heat absorption guide ring are located waste heat recovery section of thick bamboo and rotary drum desicator's inside respectively, the surfaces of the heat pipe and the heat absorption guide ring are respectively provided with a conduction fin and a heat absorption fin, and the heat pipe and the heat absorption guide ring are of an integrally formed structure;
the rotary drum dryer comprises a drying outer drum and a mesh grid rotary drum, wherein hot air guide cavities are formed in the inner side of the drying outer drum and the outer side of the mesh grid rotary drum, the mesh grid rotary drum is rotatably installed in the drying outer drum, one end of the mesh grid rotary drum is fixedly sleeved with a transmission gear ring positioned on the outer side of the drying outer drum, the outer side of the transmission gear ring is meshed and transmitted with a rotary driving structure, the rotary driving structure is composed of a speed reduction motor and a transmission box, a plurality of conveying blades are fixedly installed in the mesh grid rotary drum, and the conveying blades are spirally arranged;
the waste heat recovery cylinder comprises a heat insulation outer cylinder and a heat conduction cylinder, wherein slow release guide cavities are formed in the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder, a plurality of slow flow fins positioned in the slow release guide cavities are arranged on the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder and are uniformly distributed, a hot air guide hole communicated with the slow release guide cavities is formed in the top surface of the hot air guide cavities, a plurality of heat conduction fins are arranged on the inner wall of the heat conduction cylinder and are distributed on the left side and the right side of the inner wall of the heat conduction cylinder in a staggered mode, and a discharge port communicated with the slow release guide cavities is formed in the top surface of the heat insulation outer cylinder;
heat preservation conveying mechanism includes actuating mechanism, carries the auger and connects the hopper, actuating mechanism's output fixedly connected with is located carries the auger and connects the inside spiral bull stick of hopper, carry the one end of auger and connect the side fixed connection of hopper, the tip of net bars rotary drum is equipped with the return bend, the other end of return bend is linked together with the inside that connects the hopper, the discharge gate has been seted up to the bottom surface of carrying the auger other end.
2. The coal drying device for the coal-fired power plant according to claim 1, wherein the meshing crushing mechanism comprises a driving motor and a crushing roller structure, the number of the crushing rollers is two, the outer side of the crushing roller is provided with an annular crushing cutter tooth, the two crushing rollers are meshed with each other and rotate oppositely, and the output end of the driving motor is in transmission connection with the end part of the crushing roller.
3. The coal drying device for the coal-fired power plant according to claim 1, wherein the drying air inlet mechanism comprises an air pump and an air inlet pipe, the input end of the air pump is communicated with the end of the air inlet pipe, a drying box is clamped inside the air inlet pipe and is of a net-shaped box structure, a drying agent is filled inside the drying box, and the drying agent is solid particles mixed by calcium oxide and calcium hydroxide.
4. The coal drying device for the coal-fired power plant according to claim 1, wherein the slow flow fins on the inner side of the heat insulation outer cylinder and the outer side of the heat conduction cylinder are distributed in a staggered manner, and the slow flow fins, the heat conduction cylinder and the heat conduction fins are metal components.
5. The coal drying device for the coal-fired power plant according to claim 1, wherein the heat pipe and the heat absorption guide ring are respectively positioned at the inner sides of the heat conduction cylinder and the hot air guide cavity, and the heat absorption guide ring is of an arc structure.
6. The coal drying device for the coal-fired power plant according to claim 1, wherein the heat-conducting cylinder is of a sealed cylindrical structure, the output end of the drying air inlet mechanism is communicated with the inner cavity of the heat-conducting cylinder, and the other end of the heat-conducting cylinder is communicated with the end part of the air guide pipeline.
7. The coal drying device for the coal-fired power plant according to claim 1, wherein the transmission gear ring is positioned outside the drying outer cylinder, the output end of the speed reduction motor is in transmission connection with the input end of the transmission box, the mesh drum is of a mesh drum structure, and the mesh diameter of the mesh drum is not more than 0.3 mm.
8. The coal drying device for the coal-fired power plant according to claim 1, wherein a heat insulation interlayer is fixedly sleeved on the outer side of the rotary drum dryer, a heat insulation cotton layer is fixedly sleeved on the outer side of the air guide pipeline, the heat insulation interlayer and the heat insulation cotton layer are foam cotton members, and the heat insulation outer cylinder is a rock wool member.
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| CN202010808371.8A CN111981770B (en) | 2020-08-12 | 2020-08-12 | Coal drying device for coal-fired power plant |
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| CN202010808371.8A CN111981770B (en) | 2020-08-12 | 2020-08-12 | Coal drying device for coal-fired power plant |
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| CN113446836B (en) * | 2021-08-31 | 2021-10-29 | 海门兴虹环保科技有限公司 | Uplifting type environment-friendly drying equipment for coal particles |
| CN113959194A (en) * | 2021-11-26 | 2022-01-21 | 勐腊海发木材有限责任公司 | Waste heat recovery who charcoal production was used device |
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