CN116697741A - Feeding equipment and roasting system of rotary kiln - Google Patents
Feeding equipment and roasting system of rotary kiln Download PDFInfo
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- CN116697741A CN116697741A CN202310649177.3A CN202310649177A CN116697741A CN 116697741 A CN116697741 A CN 116697741A CN 202310649177 A CN202310649177 A CN 202310649177A CN 116697741 A CN116697741 A CN 116697741A
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- feeding
- rotary kiln
- heat exchange
- chamber
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- 239000000463 material Substances 0.000 claims abstract description 154
- 230000000903 blocking effect Effects 0.000 claims abstract description 56
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 13
- 239000000428 dust Substances 0.000 claims description 93
- 238000010304 firing Methods 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 17
- 239000000779 smoke Substances 0.000 description 10
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 229910052642 spodumene Inorganic materials 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
- G01G11/08—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge
- G01G11/12—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers having means for controlling the rate of feed or discharge by controlling the speed of the belt
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The application relates to the technical field of rotary kilns, in particular to a rotary kiln feeding device and a rotary kiln roasting system. The feeding equipment of the rotary kiln is used for feeding materials of a storage bin into the rotary kiln and comprises a scattering device and a feeding chamber, wherein the scattering device comprises a feeding port, a heat exchange chamber, a material blocking mechanism and a discharging port; the feeding port is arranged at the top of the heat exchange chamber and is communicated with the storage bin; the material blocking mechanism is arranged in the heat exchange chamber, the material discharging opening is arranged at the bottom of the heat exchange chamber opposite to the top, the material discharging opening is communicated with the feeding chamber, the heat exchange chamber is also communicated with the rotary kiln through a flue gas air pipe, and the flue gas air pipe is connected to the bottom of the heat exchange chamber; the feeding chamber is communicated with the rotary kiln. Through implementing the feeding equipment and the roasting system of the rotary kiln, the material can be scattered through dead weight when entering the rotary kiln and is contacted with hot flue gas of the rotary kiln for preheating, so that a material curtain is uniform, and the scattering effect is good.
Description
Technical Field
The application relates to the technical field of rotary kilns, in particular to a rotary kiln feeding device and a rotary kiln roasting system.
Background
The rotary kiln can be used for roasting treatment materials in the process and has wide application in the fields of cement production, metallurgical chemical industry, sludge and waste salt treatment and the like. Taking spodumene roasting process as an example, in pyrometallurgical technology for preparing battery-grade lithium carbonate by taking spodumene as a raw material, materials are required to be sent into a rotary kiln for roasting.
The process for feeding materials to the rotary kiln generally comprises two processes, wherein one process is to mechanically break up materials, disperse the materials into a heat exchange pipeline for heat exchange, and then send the materials into the rotary kiln for roasting; the other is to directly send the materials into the rotary kiln through the chute for roasting. For the feeding mode that the materials directly enter the rotary kiln, the materials easily block the feeding port, so that the feeding is uneven; and for the feeding mode with the mechanical breaking procedure, the structure is complex, the production cost is higher, and the breaking device has serious abrasion and short service life in a high-temperature and high-dust environment.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The utility model aims at providing a feeding equipment and calcination system of rotary kiln can make the material break up through the dead weight when getting into the rotary kiln to with the hot flue gas contact preheating of rotary kiln, make the material curtain even, break up effectually.
According to one aspect of the present disclosure, there is provided a feeding apparatus of a rotary kiln for feeding material of a silo into a rotary kiln, the feeding apparatus of the rotary kiln comprising a scattering device and a feeding chamber;
the scattering device comprises a feeding port, a heat exchange chamber, a material blocking mechanism and a discharging port; the feeding port is arranged at the top of the heat exchange chamber and is communicated with the storage bin; the material blocking mechanism is arranged in the heat exchange chamber, the material discharging opening is arranged at the bottom of the heat exchange chamber opposite to the top, the material discharging opening is communicated with the feeding chamber, the heat exchange chamber is also communicated with the rotary kiln through a flue gas air pipe, and the flue gas air pipe is connected to the bottom of the heat exchange chamber; the feeding chamber is communicated with the rotary kiln.
In an exemplary embodiment of the present disclosure, the dam mechanism includes a plurality of dam bars, an extending direction of the dam bars is perpendicular to a vertical direction, and at least two dam bars are different in height in the vertical direction and are staggered from each other in a horizontal direction.
In an exemplary embodiment of the present disclosure, the stop mechanism includes a first stop bar, a second stop bar, a third stop bar, and a fourth stop bar, and cross sections of the first stop bar, the second stop bar, the third stop bar, and the fourth stop bar are all cross-shaped;
wherein, the second keeps off the material stick and keeps off the material stick with the third and highly the same in vertical direction, and first fender material stick, second keep off the material stick and keep off the material stick with the fourth and set gradually in vertical direction, and second keeps off the material stick, the fourth keeps off the material stick, first fender material stick and keep off the material stick and set gradually in the horizontal direction with the third.
In one exemplary embodiment of the present disclosure, the feeding apparatus of the rotary kiln further includes a pushing bar reciprocally disposed within the feeding chamber and a power unit, the pushing bar being drivingly connected to the power unit.
In one exemplary embodiment of the present disclosure, the feeding apparatus of the rotary kiln further comprises a material valve and a metering windlock device, the metering windlock device comprising a dosing machine and a windlock discharger; the feed bin, the material valve, the quantitative feeder and the air locking discharger are sequentially connected with the feeding port;
the quantitative feeder comprises a conveying belt, a material valve is arranged at the starting point of the conveying belt, and a wind locking discharger is arranged at the end point of the conveying belt.
According to another aspect of the present disclosure, there is provided a firing system comprising:
a storage bin;
the feeding equipment of the rotary kiln is connected with the bin;
the rotary kiln is connected with feeding equipment of the rotary kiln;
the material returning and collecting device is connected with a heat exchange chamber of the feeding device of the rotary kiln and is also connected with a feeding chamber of the feeding device of the rotary kiln.
In one exemplary embodiment of the present disclosure, the return material collecting device includes a first dust collecting device and a second dust collecting device, the heat exchange chamber, the first dust collecting device and the second dust collecting device are connected in sequence,
the first dust collection device is also communicated with the feeding chamber, and the second dust collection device is also communicated with the feeding chamber.
In an exemplary embodiment of the present disclosure, the first dust collecting device includes a dust collecting barrel, a first air inlet pipe, a first air outlet pipe and a first dust exhaust pipe, all of which are connected to the dust collecting barrel;
the first air inlet pipe is communicated with the heat exchange chamber, the first air inlet pipe is connected to the top of the heat exchange chamber, and the first dust exhaust pipe is communicated with the feeding chamber through the first material returning valve.
In one exemplary embodiment of the present disclosure, the second dust collection device includes a dust collection box, a filter bag, a second air outlet pipe and a second dust discharge pipe, the dust collection box is communicated with the first air outlet pipe, the filter bag is arranged in the dust collection box, the second air outlet pipe is connected to the dust collection box, the second dust discharge pipe is connected to the filter bag, and the second dust discharge pipe is communicated with the feeding chamber through a second return valve.
In an exemplary embodiment of the present disclosure, the second dust collecting device further includes a chute, a start point of the chute is connected with the second dust exhaust pipe, an end point of the chute is connected with the second return valve, a transport fan is further provided at the start point of the chute, and an air outlet is further provided at the end point of the chute.
According to the feeding equipment and the roasting system of the rotary kiln, in the process that spodumene materials fall from the feeding port to the discharging port under the action of dead weight, high-temperature smoke enters the heat exchange chamber from the bottom of the heat exchange chamber, rises in the heat exchange chamber, preheats the materials in a direct contact heat exchange and heat radiation heat exchange mode, and lifts up a material curtain. The particle and the powdery material are scattered under the dead weight, a uniform material curtain can be formed under the action of rising smoke, the scattering effect of the material is improved, the heat exchange efficiency is improved, the preheating effect is improved, and the heat of the smoke can be fully utilized. Compared with a mechanical scattering device, the device does not need a transmission mechanism, has a simple structure, can reduce the failure rate and the manufacturing and maintenance cost, is beneficial to maintenance and replacement, and reduces the energy consumption.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:
FIG. 1 illustrates a schematic diagram of a firing system according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a schematic diagram of a dam mechanism according to an exemplary embodiment of the present disclosure.
The reference numerals are explained as follows:
100. a rotary kiln; 11. a storage bin; 12. a bin anti-blocking device; 13. a material valve; 14. a dosing machine; 15. locking the air discharger; 16. a pneumatic gate valve;
21. a heat exchange chamber; 22. a flue gas duct; 23. a feed valve; 24. a material blocking mechanism; 241. a first material blocking rod; 242. a second material blocking rod; 243. a third material blocking rod; 244. a fourth material blocking rod;
31. a feeding chamber; 32. pushing a material rod; 33. a power device;
41. a first air inlet pipe; 42. a dust collection barrel; 43. a first dust discharge pipe; 44. a first return valve; 45. a first air outlet pipe; 46. a dust collection box; 47. a second dust discharge pipe; 48. a second return valve; 49. a chute; 50. and (5) a transportation fan.
Detailed Description
The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.
Unless specified or indicated otherwise, the terms "coupled," "affixed," and the like are to be construed broadly and are used interchangeably, and are intended to encompass, for example, fixed, removable, or integral, as well as direct, or indirect, via intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.
Further, the terms of orientation such as "inner", "outer", "top", "bottom", "vertical direction", "horizontal direction", etc. described in the exemplary embodiments of the present disclosure are merely for convenience, and the orientations of the feeding apparatus and the roasting system in actual operation according to the present disclosure are described according to the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. In addition, the terms "first" and "second" etc. are used as labels only, and are not limiting on the number of objects thereof.
Lithium salts such as lithium carbonate, lithium hydroxide, lithium sulfate and lithium chloride are important raw materials for preparing new energy lithium ion batteries. At present, when spodumene is used as a raw material to produce lithium carbonate, a rotary kiln roasting and lithium extracting process is generally used. In the prior art, the process of feeding to a rotary kiln generally comprises two kinds: a feeding process including a preheating process and a feeding process not including a preheating process.
For a feeding process which does not comprise a preheating process, materials generally directly enter the rotary kiln 100 through an inclined chute to perform transformation roasting, the feeding mode is easy to cause material flushing, the feeding of the materials is uneven and easy to block a feeding port, and due to the fact that the spodumene roasting temperature is high, the transformation roasting quality of the spodumene crystal forms is poor due to the fact that the spodumene roasting process is not performed, and the recovery rate of lithium is affected. In the feeding process with the preheating procedure, in some feeding equipment, materials fall on a broadcasting plate through a locking air feeder, and when materials with poor fluidity are encountered, material accumulation occurs, so that a feeding hole is blocked; when the material with good fluidity is encountered, the material dispersing effect is poor, and the material curtain is unevenly distributed. In other feeding devices, the material is mechanically broken up into fluffy small particle material, dispersed into a heat exchange pipeline for heat exchange, and fed into the rotary kiln 100 for roasting through a feeding slope. However, because the mechanical breaking device works in a high-temperature and high-dust smoke environment, the mechanical breaking device which rotates at a high speed is contacted with materials, so that the mechanical breaking device is severely worn, the service life is short, the failure rate is high, and the cost is high.
To the above-mentioned problem, the present disclosure provides a feeding device and a roasting system of a rotary kiln, which can break up materials by dead weight when the materials enter the rotary kiln 100, and contact with hot flue gas of the rotary kiln 100 for preheating, so that a material curtain is uniform, and a breaking effect is good.
According to a first aspect of the present disclosure, a rotary kiln feeding apparatus is provided for feeding material from a silo 11 into a rotary kiln 100 for firing. Referring to fig. 1, the feeding apparatus of the rotary kiln includes a scattering device and a feeding chamber 31, wherein the scattering device includes a feeding port, a heat exchange chamber 21, a dam mechanism, and a discharging port. The feeding port is arranged at the top of the heat exchange chamber 21 and is communicated with the storage bin 11, so that materials in the storage bin 11 enter the heat exchange chamber 21 from the feeding port, the discharging port is arranged at the bottom of the heat exchange chamber 21 and is communicated with the feeding chamber 31, a material blocking mechanism is further arranged in the heat exchange chamber 21, the materials entering the heat exchange chamber 21 from the feeding port fall on the material blocking mechanism under the action of gravity, are broken into a loose state by impact, and enter the feeding chamber 31 communicated with the rotary kiln 100 from the discharging port. The heat exchange chamber 21 is also communicated with the rotary kiln 100 through a flue gas air pipe 22, and the flue gas air pipe 22 is connected to the bottom of the heat exchange chamber 21.
When feeding the rotary kiln 100 with the feeding device of the rotary kiln according to the present disclosure, taking an internal heating rotary kiln as an example, the flue gas duct 22 may be communicated with a burner of the rotary kiln, and the flue gas generated by the combustion of the burner is led into the heat exchange chamber 21. In the process that spodumene materials fall from a feeding port to a discharging port under the action of dead weight, high-temperature flue gas enters the heat exchange chamber 21 from the bottom of the heat exchange chamber 21, rises in the heat exchange chamber 21, preheats the materials in a direct contact heat exchange and heat radiation heat exchange mode, and lifts up a material curtain. The particle and the powdery material are scattered under the dead weight, a uniform material curtain can be formed under the action of rising smoke, the scattering effect of the material is improved, the heat exchange efficiency is improved, the preheating effect is improved, and the heat of the smoke can be fully utilized. Compared with a mechanical scattering device, the device does not need a transmission mechanism, has a simple structure, can reduce the failure rate and the manufacturing and maintenance cost, is beneficial to maintenance and replacement, and reduces the energy consumption.
Other types of rotary kilns 100 are also possible, for example, in some embodiments, the rotary kiln 100 is of external heat type, the outer surface of the barrel of the rotary kiln 100 is sleeved with a natural gas hot blast stove through jacket rotation, and the flue gas air duct 22 can be communicated with the natural gas hot blast stove sleeved outside the rotary kiln 100 to guide hot flue gas into the heat exchange chamber 21.
The feeding apparatus of the rotary kiln of the present disclosure will be described in detail with reference to fig. 1 to 2 in the order in which materials enter the rotary kiln 100 from the bin 11. The dashed arrows in the figure indicate the flow direction of the flue gas. In an exemplary embodiment of the present disclosure, the feeding apparatus of the rotary kiln further comprises a metering windlock device comprising a dosing machine 14 and a windlock discharger 15. The outlet of the storage bin 11 can be provided with a storage bin anti-blocking device 12 and a material valve 13 for controlling the discharging amount of the storage bin 11. The bin blocking preventing device 12 may be a stirring mechanism, a vibrating mechanism, etc., and the material valve 13 may be a knife gate valve, a bar valve, etc., which is not particularly limited in this disclosure. In one embodiment, the material valve 13 is a single-layer bar valve or a double-layer bar valve, which can be a manual bar valve, or a pneumatic bar valve or an electrohydraulic bar valve, so that the problem of high opening and closing force caused by large spodumene material particles can be overcome.
The feed bin 11, the material valve 13, the quantitative feeder 14, the air locking discharger 15 and the feeding port are sequentially connected. The dosing machine 14 is mainly used for automatic continuous weighing and dosing of bulk, granular and powdery materials. The dosing machine 14 comprises a conveyor belt, the flow of the conveyed material being controllable by controlling the speed of the conveyor belt. The material valve 13 is arranged at the starting position of the conveyor belt, and the air locking discharger 15 is arranged at the end position of the conveyor belt. The air locking discharger 15 is connected with a feeding port at the top of the heat exchange chamber 21 and is used for vertically feeding into the heat exchange chamber 21, the air locking discharger 15 can improve the sealing performance of vertical feeding, external air flow is prevented from entering the equipment to affect the rotation direction of the internal air flow, further discharging is affected, and a pneumatic gate valve 16 can be further arranged between the air locking discharger 15 and the feeding port.
After entering the heat exchange chamber 21 from the feeding port, the materials are scattered by the material blocking mechanism under the action of dead weight. In an exemplary embodiment, the blocking mechanism comprises a plurality of blocking rods, wherein the extending direction of the blocking rods is vertical to the vertical direction, and at least two blocking rods are different in height in the vertical direction and are staggered from each other in the horizontal direction. Specifically, in the exemplary embodiment of the present disclosure, the vertical direction refers to the gravitational direction, which is also the top-to-bottom direction of the heat exchange chamber 21, and the horizontal direction is parallel to the vertical direction. The structure of the material blocking bars can be identical, different from each other or basically similar. For example, the whole heat exchange chamber 21 is approximately conical or conical with gradually shrinking top to bottom, two material blocking rods with the same cross-sectional shape are arranged in the heat exchange chamber 21, the two material blocking rods extend along the horizontal direction, and the extending axes of the two material blocking rods are parallel. The axes of the two material blocking rods are not in the same horizontal plane, and the axes of the two material blocking rods are not in the same vertical plane.
The material falls on keeping off the material stick after feeding mouth gets into heat transfer chamber 21, is broken up into the material of granule and powder under the impact effect, because two keep off the material stick and highly different in heat transfer chamber 21, and stagger each other, is favorable to avoiding the material to block up the stock stop. In some embodiments, it should be noted that, although the cross-sectional shape of the stopper rod may be the same, the length of the stopper rod may be different due to the different connection positions of the stopper rod and the inner wall of the heat exchange chamber 21 according to the position of the stopper rod in the heat exchange chamber 21.
In one exemplary embodiment, referring to FIG. 2, the dam mechanism includes a first dam bar 241, a second dam bar 242, a third dam bar 243, and a fourth dam bar 244. The cross sections of the first baffle bar 241, the second baffle bar 242, the third baffle bar 243 and the fourth baffle bar 244 are the same, and the cross section shapes of the first baffle bar 241, the second baffle bar 242, the third baffle bar 243 and the fourth baffle bar 244 are not changed along the length extending direction. For example, the cross sections of the first baffle bar 241, the second baffle bar 242, the third baffle bar 243 and the fourth baffle bar 244 are cross-shaped. The second material blocking rod 242 and the third material blocking rod 243 have the same height in the vertical direction, and the first material blocking rod, the second material blocking rod 242 and the fourth material blocking rod 244 are sequentially arranged from top to bottom in the vertical direction; in the horizontal direction, the second blocking rod 242, the fourth blocking rod 244, the first blocking rod 241 and the third blocking rod are sequentially arranged.
The material broken up by the dam mechanism enters the feeding chamber 31 from the discharge opening, and in an exemplary embodiment of the present disclosure, a feeding valve 23 is provided between the discharge opening and the feeding chamber 31 for air-locking feeding. The feeding device of the rotary kiln further comprises a pushing rod 32 and a power device 33, wherein the pushing rod 32 is in driving connection with the power device 33, and the power device 33 drives the pushing rod 32 to reciprocate in the feeding chamber 31, so that materials accumulated in the feeding chamber 31 can be pushed into the rotary kiln 100. Specifically, the power device 33 may be a hydraulic device, and controls the movement of the pushing rod 32 through hydraulic oil, so that when the pushing rod 32 advances, the materials accumulated in the feeding chamber 31 are pushed into the rotary kiln 100; when the pushing bar 32 is retracted, a cavity appears in front of the pushing bar 32 and the cavity is filled with material deposited above the pushing bar 32. In some exemplary embodiments, the power device 33 may also be an air pressure device or a linear push rod motor, etc., so long as the pushing rod 32 can be pushed to reciprocate in the feeding chamber 31.
Compared with the conventional method that the dead weight or the height drop of the material is utilized to enable the material to enter the rotary kiln 100, the reciprocating motion of the pushing rod 32 is used for controlling the feeding of the rotary kiln 100, so that the material with poor fluidity can be uniformly fed into the rotary kiln 100, and the phenomena of material flushing, thermal instability of the rotary kiln 100 caused by material flushing and roasting quality fluctuation are avoided. Compared with a spiral feeder, the scattered materials are accumulated in the feeding chamber 31 and are uniformly pushed to the rotary kiln 100 by the pushing rod 32, so that high-temperature particles and dust can be prevented from diffusing in the environment to cause equipment damage, the abrasion of the materials to the feeding equipment can be reduced, and the service life of the feeding equipment is prolonged.
According to a second aspect of the present disclosure, there is provided a roasting system comprising a silo 11, a feeding device for a rotary kiln, a rotary kiln 100 and a return collection device connected in sequence. Wherein the material is stored in the bin 11, and the feeding equipment of the rotary kiln can be any one of the foregoing exemplary embodiments or reasonable combination thereof. The return collection device is connected with the heat exchange chamber 21 and the return collection device is also connected with the feeding chamber 31. The roasting system of the exemplary embodiment of the present disclosure has all the advantages of the aforementioned feeding apparatus of the rotary kiln, and, since the high-temperature flue gas rises in the heat exchange chamber 21 from the bottom of the heat exchange chamber 21, the particulate material having a large self weight can enter the feeding chamber 31 through the feed opening, and the lighter dust-like material is lifted. The high-temperature flue gas passes through the returning material collecting device, can collect the materials carried in the flue gas, and is sent into the feeding chamber 31, and is sent into the rotary kiln 100 by the pushing rod 32, so that the recovery rate of the materials is improved, and waste is avoided.
The return material collecting device can comprise a multi-stage dust collecting device, so that the collecting effect on materials in the smoke can be improved, and waste is avoided; the flue gas after passing through the return collecting device can be discharged after being subjected to waste gas treatment, so that the return collecting device can also reduce the difficulty of waste gas treatment. In one exemplary embodiment of the present disclosure, the return collection device includes a first dust collection device and a second dust collection device. The heat exchange chamber 21, the first dust collection device and the second dust collection device are sequentially connected, and the first dust collection device and the second dust collection device are respectively communicated with the feeding chamber 31.
For example, the first dust collecting device includes a dust collecting tub 42, a first air inlet pipe 41, a first air outlet pipe 45, and a first dust discharge pipe 43. The first air inlet pipe 41, the first air outlet pipe 45 and the first dust exhaust pipe 43 are all connected to the dust collection barrel 42, the first air inlet pipe 41 is connected to the top of the heat exchange chamber 21, and high-temperature gas carrying smoke dust enters the dust collection barrel 42 from the top of the heat exchange chamber 21 through the first air inlet pipe 41. Specifically, after the gas enters the dust collection barrel 42, the gas is guided by the shape and structure in the dust collection barrel 42 and is converted from linear motion to circular motion. During the rotation, the relatively dense material dust particles are separated from the gas and thrown to the inner wall of the dust collecting barrel 42 due to the centrifugal effect, and the material dust particles fall down the wall surface after contacting with the inner wall of the dust collecting barrel 42 and enter the feeding chamber 31 through the first dust discharging pipe 43.
In one exemplary embodiment, the second dust collection device includes a dust collection box 46, a filter bag, a second air outlet pipe, and a second dust exhaust pipe 47. The dust collection box 46 is communicated with the first air outlet pipe 45, and the flue gas after the first-stage material recovery through the first dust collection device enters the dust collection box 46. The dust collection box 46 is provided with a filter bag which can be made of needled or film materials and is made of metal cage bones so as to prevent the smoke from being shrunken when the smoke is filtered. The second air outlet pipe is provided with an induced draft fan, and the flue gas filtered by the filter bag can enter a dust collection device of the next stage through the second air outlet pipe or is subjected to waste gas treatment. The second dust discharge pipe 47 is connected to the filter bag, and guides the dust particles of the material filtered by the filter bag into the feeding chamber 31. In other exemplary embodiments, the return material collecting device may also include a third dust collecting device, or include more stages of dust collecting devices to enhance the material recycling effect, and the first dust collecting device and the second dust collecting device may also adopt other dust collecting modes, which are not described herein.
In an exemplary embodiment of the present disclosure, a first return valve 44 and a second return valve 48 are provided between the first dust discharge pipe 43 and the feeding chamber 31 and 13, respectively. The first return valve 44 and the second return valve 48 respectively control the first dust collector and the second dust collector to feed the material to the feeding chamber 31. In an exemplary embodiment, the second dust collection device further comprises a chute 49, the starting point of the chute 49 being connected to the second dust discharge pipe 47, the end point of the chute 49 being connected to the second return valve 48 and the valve 13, i.e. the material recovered by the filter bag can be transported by the chute 49. Specifically, a transport fan 50 is disposed at the start of the chute 49, and is used for blowing compressed air into the chute 49 to drive the material to move toward the chute 49. The end of the chute 49 is also provided with an air outlet for discharging air. Because the particle diameter of the material recovered by the second dust collecting device is smaller, compared with mechanisms such as a screw conveyor, a rubber belt conveyor, a plate type feeding machine and the like, the chute 49 is adopted for conveying the material recovered by the second dust collecting device to the feeding chamber 31, the sealing performance is good, the material can be prevented from being in direct contact with the conveying device, the abrasion to the device is reduced, and the service life is prolonged. Moreover, the chute 49 can recover the heat of the materials in the high-temperature flue gas, thereby reducing the heat loss.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. The feeding equipment of the rotary kiln is used for feeding materials of a storage bin into the rotary kiln and is characterized by comprising a scattering device and a feeding chamber;
the scattering device comprises a feeding port, a heat exchange chamber, a material blocking mechanism and a discharging port; the feeding port is arranged at the top of the heat exchange chamber and is communicated with the storage bin; the material blocking mechanism is arranged in the heat exchange chamber, the material discharging opening is arranged at the bottom of the heat exchange chamber opposite to the top, the material discharging opening is communicated with the feeding chamber, the heat exchange chamber is also communicated with the rotary kiln through a flue gas air pipe, and the flue gas air pipe is connected to the bottom of the heat exchange chamber;
the feeding chamber is communicated with the rotary kiln.
2. The feeding device of a rotary kiln according to claim 1, wherein the blocking mechanism comprises a plurality of blocking bars, the extending direction of the blocking bars is vertical to the vertical direction, and at least two blocking bars are different in height in the vertical direction and are staggered from each other in the horizontal direction.
3. The feeding device of a rotary kiln according to claim 2, wherein the blocking mechanism comprises a first blocking rod, a second blocking rod, a third blocking rod and a fourth blocking rod, and cross sections of the first blocking rod, the second blocking rod, the third blocking rod and the fourth blocking rod are cross-shaped;
the second material blocking rod and the third material blocking rod are same in height in the vertical direction, the first material blocking rod, the second material blocking rod and the fourth material blocking rod are sequentially arranged in the vertical direction, and the second material blocking rod, the fourth material blocking rod, the first material blocking rod and the third material blocking rod are sequentially arranged in the horizontal direction.
4. The rotary kiln feeding device according to claim 1, further comprising a pushing bar and a power unit, the pushing bar being reciprocally arranged in the feeding chamber, the pushing bar being drivingly connected to the power unit.
5. The rotary kiln feeding apparatus of any one of claims 1 to 4, further comprising a feed valve and a metering windlock, the metering windlock comprising a dosing machine and a windlock discharger;
the feed bin, the material valve, the quantitative feeder, the air locking discharger and the feeding port are sequentially connected;
the quantitative feeder comprises a conveying belt, the material valve is arranged at the starting point of the conveying belt, and the air locking discharger is arranged at the end point of the conveying belt.
6. A firing system, comprising:
a storage bin;
feeding equipment of a rotary kiln according to any of claims 1 to 5, connected to the silo;
the rotary kiln is connected with feeding equipment of the rotary kiln;
the material returning and collecting device is connected with a heat exchange chamber of the feeding equipment of the rotary kiln and is also connected with the feeding chamber of the feeding equipment of the rotary kiln.
7. The roasting system of claim 6, wherein the return collection device comprises a first dust collection device and a second dust collection device, the heat exchange chamber, the first dust collection device and the second dust collection device are connected in sequence,
the first dust collection device is also communicated with the feeding chamber, and the second dust collection device is also communicated with the feeding chamber.
8. The roasting system of claim 7, wherein the first dust collection device comprises a dust collection barrel, a first air inlet pipe, a first air outlet pipe and a first dust exhaust pipe, wherein the first air inlet pipe, the first air outlet pipe and the first dust exhaust pipe are all connected to the dust collection barrel;
the first air inlet pipe is communicated with the heat exchange chamber, the first air inlet pipe is connected to the top of the heat exchange chamber, and the first dust exhaust pipe is communicated with the feeding chamber through a first material returning valve.
9. The roasting system of claim 8, wherein the second dust collection device comprises a dust collection box, a filter bag, a second air outlet pipe and a second dust exhaust pipe,
the dust collection box is communicated with the first air outlet pipe, the filter bag is arranged in the dust collection box, the second air outlet pipe is connected with the dust collection box, the second dust discharge pipe is connected with the filter bag, and the second dust discharge pipe is communicated with the feeding chamber through the second return valve.
10. A calcination system according to claim 9, wherein the calcination system is configured to,
the second dust collecting device further comprises a chute, the starting point of the chute is connected with the second dust exhaust pipe, the end point of the chute is connected with the second returning valve, the starting point of the chute is further provided with a conveying fan, and the end point of the chute is further provided with an air outlet.
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| CN202310649177.3A CN116697741A (en) | 2023-06-02 | 2023-06-02 | Feeding equipment and roasting system of rotary kiln |
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| CN202310649177.3A CN116697741A (en) | 2023-06-02 | 2023-06-02 | Feeding equipment and roasting system of rotary kiln |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117739663A (en) * | 2024-02-19 | 2024-03-22 | 泰州瑞沣环保科技有限公司 | Rotary kiln tail material sliding device and method with automatic adjusting function |
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2023
- 2023-06-02 CN CN202310649177.3A patent/CN116697741A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117739663A (en) * | 2024-02-19 | 2024-03-22 | 泰州瑞沣环保科技有限公司 | Rotary kiln tail material sliding device and method with automatic adjusting function |
| CN117739663B (en) * | 2024-02-19 | 2024-04-30 | 泰州瑞沣环保科技有限公司 | Rotary kiln tail material sliding device and method with automatic adjusting function |
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