CN101037305A - Cocurrent-counter current rotary kiln calcining technique process - Google Patents
Cocurrent-counter current rotary kiln calcining technique process Download PDFInfo
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- CN101037305A CN101037305A CN 200710063474 CN200710063474A CN101037305A CN 101037305 A CN101037305 A CN 101037305A CN 200710063474 CN200710063474 CN 200710063474 CN 200710063474 A CN200710063474 A CN 200710063474A CN 101037305 A CN101037305 A CN 101037305A
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- calcining
- rotary kiln
- kiln
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- flue gas
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/0285—Rotary kilns
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention relates to a parallel-flow and back-flow type rotary kiln calcining process which belongs to an energy-saving calcining technical field. The method is to classify the calcining material into coarse particle material and fine powder material. The coarse particle material enters the rotary kiln from the end of the higher kiln. The heating smoke enters the rotary kiln in an adverse current. The coarse particle material is slowly calcined in a adverse current to the heating smoke. The fine powder material enters into the rotary kiln in a parallel-flow from the head of the lower kiln in a same direction of the heating smoke. It finishes the instantaneous calcining under the wind with a high temperature and the calcining in parallel-flow and back-flow are contemporary and consecutive. The inventive method can be achieved by slightly modifying the connecting pipe depending on the current calcining apparatus and has a good product quality, and a remarkable energy-saving effect. The method can be used in the fields such as calcining architecture gesso, different inorganic salt minerals and material drying.
Description
Technical field
The invention belongs to energy-conservation calcining technology field, particularly the improvement of calcined by rotary kiln processing method.
Background technology
Vitriol carbonate mineral and other similar calcined material such as existing installation calcined by rotary kiln gypsum, magnesite, rhombspar, Wingdale, its process for calcining has following current and reverse-flow etc. several, but heat-supplying mode mostly is coal powder injection, oil injection type, fluidized bed type is also arranged, the feed mode is at technology and different, the downflow system material is all from the charging of temperature end kiln hood, and reverse-flow material is all from the charging of low-temperature end kiln tail.
One of the applicant is entitled as " magnesia calcining boiling furnace rotary kiln method and equipment " (application number is 200510108342.6) application for a patent for invention, a kind of reverse-flow processing method is disclosed, this processing method is: material from rotary kiln high-endly enter, low side discharges, the hot flue gas that coal-fired fluidizing furnace produces from the low side of rotary kiln enter, high-end discharge, material and hot flue gas carry out reverse-flow heat exchange in rotary kiln; The dust of the high-end discharge of rotary kiln, flue gas are sent into transfer roller by the materials dust material that has that dust collection device reclaims, and the flue gas that dust collection device is discharged is discharged through induced draft fan and flue gas emptying chimney; The high temperature chamotte that rotary kiln low side kiln hood is discharged with have materials dust material together to enter a stewing jar storehouse to mix stewingization from dust collection device, make underdone material under the hyperthermia radiation heat effect, change into grog, cross imitation frosted glass carry out temper, after the cooling of the grog of stewingization, send into the work in-process storehouse, send into pulverizer after the work in-process deironing in work in-process storehouse and carry out grinding.
The equipment of realizing this method produces supply system, II district rotary kiln calcination system, III district feeder system, IV district dust collecting system and V district grog conveying storage ageing cooling system by the hot flue gas of I district fluidizing furnace and forms, wherein: the hot flue gas of fluidizing furnace produce supply system by link to each other successively by the coal supply crusher, bucket elevator, Pulverized Coal Bin, garden dish feeder, the fluidizing furnace of being furnished with dreg removing system, hot-blast outlet and the chimney that leaks informaton are formed, and wherein the fluidizing furnace bottom is connected with blast cap, isobaric bellows and gas blower in turn; The rotary kiln calcination system is made up of the kiln hood cover of the kiln hood that links to each other with hot-blast outlet, kiln body and lower end band discharge gate successively, the roller circle of supporting rotation is housed in external week of kiln and is fitted with bull gear, pinion(gear) and the rotary electric machine that drives rotation successively; Feeder system is made up of conveyor, feed storehouse, rotary conveyor, bucket elevator, fine crushing machine, vibratory screening apparatus and coarse breaking machine under the tremie pipe that links to each other with the kiln hood cover, hopper, bucket elevator, weighing belt, small feed bin, the storehouse successively; Dust collecting system is equipped with the belt dust-precipitator of dust-precipitator drainage conduit, induced draft fan and flue gas emptying chimney by cyclonic separator, the lower end of the kiln hood cover of lower end band discharge gate, lower end band drainage conduit successively to be formed, kiln hood cover discharge gate, the equipped transfer roller of drainage conduit and dust-precipitator drainage conduit below; Grog is carried and is stored the stewing jar of storehouse that the ageing cooling system is linked to each other with transfer roller by upper end and kiln hood successively, and oblique rotary conveyor, pulverizer, bucket elevator and the wrapping machine of rotary conveyor, equipped electric magnetic iron remover are formed under rotation cooling cylinder, bucket elevator, scraper plate machine, work in-process storehouse, the storehouse.
Above-mentioned following current and reverse-flow two kinds of methods all exist certain drawback, and particulate material and fine powder material can not separately be calcined, and influence quality product.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, a kind of cocurrent-counter current rotary kiln calcining technique process is provided, and this processing method can be changed and can realize connecting tube on the basis of existing calciner a little, and good product quality, energy-saving effect is remarkable.Can be used for calcining fields such as plaster of Paris, all kinds of inorganic salt minerals and drying materials.
The technical scheme that patent of the present invention solves its technical problem employing is: elect the calcined material branch as coarseparticulate material and powder material, described coarse particles material enters rotary kiln from high-end kiln tail, elevated temperature heat flue gas adverse current in the other direction enters rotary kiln, and the coarse particles material is slowly calcined with the opposite adverse current of hot flue gas direction; This powder material enters rotary kiln from low side kiln hood and the equidirectional following current of described elevated temperature heat flue gas, finishes instantaneous calcining under the high-temperature hot-air effect, and the concurrent-countercurrent calcining is carried out simultaneously continuously.
Characteristics of the present invention and effect:
The inventive method will be entered from kiln tail (high-end) adverse current by incinerating coarse particles material, and will be opposite with hot flue gas direction, and powder material enters from kiln hood (low side) and hot flue gas following current, and move toward one another is called concurrent-countercurrent formula technology.This processing method can be changed and can realize connecting tube on the basis of existing calciner a little, and good product quality, and energy-saving effect is remarkable.Can be used for to calcine plaster of Paris, all kinds of inorganic salt minerals and drying materials etc.
Description of drawings
Fig. 1 is a cocurrent-counter current rotary kiln calcining technique process embodiment schema of the present invention.
Embodiment
Below in conjunction with drawings and Examples processing method flow process of the present invention is described in detail:
Realize the equipment of present embodiment and technical process as shown in Figure 1, the equipment among Fig. 1 divides 4 systems: produce supply system comprising rising the hot flue gas of floating stove, and by rising floating stove master stove 19, main air blower 22, air distribution valve 20, coal supply storehouse and measuring apparatus 21, snorting valve 18 is formed; The material supply calcination system, by feed bin 1, multi-deck screen 2, chute 3 and base plate 8 thereof, weighing belt 4, above installed electro-magnet 5 and endless belt conveyor 6, opening for feed 9, rotary kiln 11 and motor 12 thereof additional, formed through tubular type handling equipment 16 and feed bin 17, fume recovery system is by rotary kiln tail head-shield 10, pipeline 101, dust-precipitator 7 induced draft fans 15, scraper conveyor 13 dust storehouses 14 are formed; The finished product delivery system is made up of stewingization jar 25, outlet 26, hot scraper plate machine 27, discharge port, finished bin 24.
The equipment of present embodiment and existing calciner are basic identical, improvements are to be provided with multi-deck screen 2, chute 3 and base plate 8 thereof between feed bin 1 and weighing belt 4, its effect is that material is by volume carried out big or small sorting, in addition rotary kiln 11 front ends another feed bin 17 is set and be connected base plate 8 and feed bin 17 between tubular type handling equipment 16, its effect is directly to deliver to rotary kiln 11 front ends by the powder material of multi-deck screen 2.
The processing method of present embodiment is; Enter feed bin 1 from the material behind the multiple stage crushing, then through multi-deck screen 2 general 〉=5mm coarse particles materials directly deliver to by weighing belt 4 transfer roller 6 (during on endless belt conveyor 6, installed electro-magnet additional, in service with iron cut absorption remove), be transported in the rotary kiln 11 high-end kiln tails by opening for feed 9 again; 〉=800 ℃ of elevated temperature heat flue gas opposite direction adverse currents enter rotary kiln, the reverse-flow slow calcining of the opposite formation with hot flue gas direction of coarse particles material; Calcine thick material and flow into stewingization jar 25, after a few hours stewingization, exported to finished bin 27 by hot scraper plate machine 27 from exporting 26 through rotary kiln low side outlet.
Be delivered to feed bin 17 from chute 3 through tubular type handling equipment 16 through multi-deck screen 2≤5mm fine powder material, enter rotary kiln 11 from low side kiln hood and the equidirectional following current of described elevated temperature heat flue gas after metering, under the high-temperature hot-air effect, finish instantaneous calcining, fine powder material after the calcining enters stewingization jars 25, is exported to finished bin 27 from exporting 26 by hot scraper plate machine 27 after a few hours stewingization; The incinerating dust moves to kiln tail fume recovery system after along with hot blast and enters the dust storehouse.
To be fine powder material enter from the front end of rotary kiln the characteristics of this processing method, is the instantaneous calcining of following current, and coarse particles enters from the tail end of rotary kiln, is that adverse current is slowly calcined.Make big or small material all can be calcined rightly like this; This thickness is incinerating concurrent-countercurrent formula technology respectively, good product quality, and energy-saving effect is remarkable.
The reverse-flow process for calcining of coarse particles material is identical with prior art with processing parameter in this processing method, be characterized on the basis of this processing method, having increased the reverse charging of fine granular materials and form reverse-flow process for calcining, and realize simple, substantially do not increase the technology cost, the concurrent-countercurrent calcining is carried out simultaneously continuously.
Claims (2)
1, a kind of cocurrent-counter current rotary kiln calcining technique process, it is characterized in that, this method is to elect the calcined material branch as coarseparticulate material and powder material, described coarse particles material enters rotary kiln from high-end kiln tail, elevated temperature heat flue gas adverse current in the other direction enters rotary kiln, and the coarse particles material is slowly calcined with the opposite adverse current of hot flue gas direction; This powder material enters rotary kiln from low side kiln hood and the equidirectional following current of described elevated temperature heat flue gas, finishes instantaneous calcining under the high-temperature hot-air effect, and the concurrent-countercurrent calcining is carried out simultaneously continuously.
According to the described method of claim 1, it is characterized in that 2, the method that described calcined material branch is elected coarseparticulate material and powder material as is, before the material calcining through screening elect as 〉=the coarse particles material of 5mm and≤powder material of 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710063474 CN101037305A (en) | 2007-02-02 | 2007-02-02 | Cocurrent-counter current rotary kiln calcining technique process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710063474 CN101037305A (en) | 2007-02-02 | 2007-02-02 | Cocurrent-counter current rotary kiln calcining technique process |
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| Publication Number | Publication Date |
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| CN101037305A true CN101037305A (en) | 2007-09-19 |
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| CN 200710063474 Pending CN101037305A (en) | 2007-02-02 | 2007-02-02 | Cocurrent-counter current rotary kiln calcining technique process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063015A (en) * | 2013-01-31 | 2013-04-24 | 伍耀明 | Vacuum rotary kiln with mine dust return system |
| CN105384363A (en) * | 2015-11-24 | 2016-03-09 | 洛阳建材建筑设计研究院有限公司 | Application method of active lime rotary kiln |
| CN111733330A (en) * | 2020-05-19 | 2020-10-02 | 北京科技大学 | Method for enriching and recovering zinc by using rotary kiln |
-
2007
- 2007-02-02 CN CN 200710063474 patent/CN101037305A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063015A (en) * | 2013-01-31 | 2013-04-24 | 伍耀明 | Vacuum rotary kiln with mine dust return system |
| CN105384363A (en) * | 2015-11-24 | 2016-03-09 | 洛阳建材建筑设计研究院有限公司 | Application method of active lime rotary kiln |
| CN105384363B (en) * | 2015-11-24 | 2018-05-04 | 洛阳建材建筑设计研究院有限公司 | A kind of application process of Active Lime Rotary Kiln |
| CN111733330A (en) * | 2020-05-19 | 2020-10-02 | 北京科技大学 | Method for enriching and recovering zinc by using rotary kiln |
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Open date: 20070919 |