CN207943888U - The equipment that nepheline preheats predecomposition dry sintering production alumina clinker - Google Patents
The equipment that nepheline preheats predecomposition dry sintering production alumina clinker Download PDFInfo
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- CN207943888U CN207943888U CN201721612824.XU CN201721612824U CN207943888U CN 207943888 U CN207943888 U CN 207943888U CN 201721612824 U CN201721612824 U CN 201721612824U CN 207943888 U CN207943888 U CN 207943888U
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- preheater
- nepheline
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The utility model discloses the equipment that a kind of nepheline preheating predecomposition dry sintering produces alumina clinker, the equipment includes preheater, dore furnace, rotary kiln, grate-cooler, preheater includes at least three-level preheater being sequentially communicated, rotary kiln smoke-box is equipped with bypass device, grate-cooler end is exported equipped with alumina clinker, and dore furnace uses tertiary air single admission.The utility model realizes technological progress of the alumina sintering technique from wet processing to preheating predecomposition dry process, realizes large-scale production, and accompanied by substantial power saving, system operatio is simple, and former, fuel cost declines, high degree of automation.
Description
Technical field
The utility model belongs to technical field of alumina production, and predecomposition dry sintering is preheated more particularly to a kind of nepheline
The equipment for producing alumina clinker.
Background technology
The identified bauxite resource in China is according to current exploitation rate, the resource guarantee time limit about 20 years, far from satisfaction
The needs of China's aluminium industry sustainable development.China's a large amount of import bauxite since 2000, the external dependence degree of bauxite resource
Up to 50%.Increasingly in short supply with bauxite resource, the problem of bauxite rise in price and grade decline, is on the rise, part
Even there is the phenomenon that stopping production in short term caused by bauxite supply problem in enterprise.Therefore the resource of non-bauxitic containing aluminium is developed and used to replace
For part bauxite, be conducive to the contradiction for alleviating domestic bauxite resource shortage, for ensureing aluminium Industrial Security, enhancing aluminium industry
The capability of sustainable development has realistic meaning.The bauxite resource shortage of current China, and nepheline resource not yet develops and uses, because
This, it will be that China's aluminum i ndustry sustainable development is facing and needing solve a war to efficiently use nepheline resource production aluminium oxide
Slightly sex chromosome mosaicism.
The domestic factory for producing aluminium oxide using nepheline dry sintering not yet at present, alumina producing project, which mostly uses, visits
Ear method produces, and Bayer process is higher to bauxite quality requirement, exacerbates the tense situation of high-quality bauxite supply, and wet method work
Skill high energy consumption, resource utilization are low.The technique of dry sintering is in the research starting stage, according to pre- point of this paper incomplete statistics preheating
Solution dry sintering nepheline production alumina clinker technology still belongs to precedent, can effectively reduce energy consumption, and effective exploitation is provided using nepheline
Source.
Invention content
The utility model provides a kind of nepheline preheating predecomposition dry method to solve technical problem present in known technology
The equipment of sintering production alumina clinker, the equipment operation is simply controllable, and be produced on a large scale application, in product alumina leaching
Raw material, fuel cost can be made to be greatly reduced in the case of the qualifieds such as rate.
The utility model is to solve a technical solution being taken of technical problem present in known technology：
A kind of technique of nepheline preheating predecomposition dry sintering production alumina clinker, includes the following steps：
One) it is respectively 25-45%, 45-65% and 0-10% by weight percentage by raw material nepheline, lime stone and white slurry
Stoichiometry is homogenized through grinding and raw material is made；
Two) by step 1) obtained raw material send to preheater；Enter dore furnace after preheated device preheating to decompose, enter back into
The calcination temperature of calcined by rotary kiln, rotary kiln clinkering zone is 1200-1400 DEG C, and kiln residence time is 20-50 minutes；
Three) clinker after calcining enters grate-cooler cooling, obtains alumina clinker.
The rate value of the raw material is alkali aluminium ratio Na2O/Al2O3For 1.8-2.1, calcium silicon ratio CaO/SiO2For 0.9-1.1.
The cooling air of the grate-cooler and 1100-1400 DEG C of high temperature chamotte for going out rotary kiln exchange heat, the high temperature of recuperation of heat
Air themperature is 800-1100 DEG C, wherein portion of air enters rotary kiln as Secondary Air, and portion of air enters as tertiary air
Dore furnace, respectively as the combustion air of rotary kiln and dore furnace fuel；The preheater comes out dore furnace and rotary kiln
800-1100 DEG C of exhaust gas carries out heat exchange with room temperature raw material, and preheated raw meal enters dore furnace decomposition, subsequently into calcined by rotary kiln,
Exhaust gas temperature minimum can be down to 280 DEG C of discharge preheaters through heat exchange.
Preferably, the step 1) in, raw material nepheline, lime stone and white slurry are respectively 30- by weight percentage
40%, 50-60% and 0-5% stoichiometries are homogenized through grinding and raw material are made.
The utility model is to solve another technical solution for being taken of technical problem present in known technology：
It is described using the equipment of above-mentioned technique productions alumina clinker, including preheater, dore furnace, rotary kiln, grate-cooler
Preheater includes at least three-level preheater being sequentially communicated, and every grade of preheater includes cyclone cylinder, connects air hose and tremie pipe,
The cyclone cylinder of number second level preheater is connect by tremie pipe with dore furnace, and the decomposition furnace outlet is by connecting air hose and final stage
The cyclone cylinder import of preheater connects, and the cyclone cylinder of the final stage preheater is connect by tremie pipe with kiln tail smoke-box, described point
The bottom of solution stove is connect with the kiln tail smoke-box of rotary kiln tail portion, and the kiln tail smoke-box is equipped with bypass device, the cooling
Machine is connect with the wicket cover on rotary kiln head, and the grate-cooler is the forth generation cooler that can prevent clinker from deliquescing, the comb
Cold end is exported equipped with alumina clinker.
The tapering of the dore furnace or lower prop are equipped with tertiary air unilateral side entrance, and are set in tertiary air unilateral side entrance top
There are kiln tail burner, the volume of the dore furnace to ensure gas residence time >=5.0s.
Tertiary-air pipe and decomposition of at the top of the wicket cover or grate-cooler top by internal recovering grate-cooler high temperature air
Stove unilateral side entrance connection supply tertiary air.
The tertiary-air pipe is equipped with flow control valve.
The wicket cover is equipped with kiln hood burner, and the ratio that kiln hood burner feeding fuel accounts for total fuel is 30-50%.
It is equipped with air valve and seasoning spreading box on the tremie pipe.
The utility model has the advantages and positive effects of：
One) raw material for using nepheline dispensing, can be made the alumina clinker finished product of high-quality, reduce alumina industry
To the degree of dependence of the raw materials such as high-grade raw material bauxite, cost of material is reduced.
Two) using preheating predecomposition technology, at least three-level cyclone cylinder of preheater can efficiently use the useless of kiln generation
Gas suspension preheated raw meal cancels igniting chimney, 280 DEG C can be reduced to using Pyatyi pre-heater apparatus outlet exhaust temperature；It decomposes
Stove makes raw material carry out precalcining, can significantly expand the production capacity of rotary kiln.
Three) dore furnace uses tertiary-air pipe single admission so that tertiary-air pipe pipeline it is shorter, stringing is convenient, and saving is set
It is standby, reduce production cost.
Four) grate-cooler is forth generation cooler, can prevent alumina clinker from deliquescing blocking comb seam, and discharge using unilateral,
The heat that can make full use of rotary kiln clinker discharging preheats combustion air, improves energy regenerating, reduces fuel and uses, reduces
Fuel cost；
Five) using bypass technology can resist containing alkali, raw material containing chlorine to dry sintering process bands come fluctuation, reach
Steady production, industrial-scale production.
Six) the utility model aluminum raw material uses nepheline, and it is pre- from wet processing to preheating to realize alumina sintering technique
The technological progress of dry process is decomposed, it can be achieved that large-scale production, rotary kiln single line yield are carried by existing maximum-norm 1000t/d
Height is to 3700t/d or more；The utility model accompanied by substantial power saving, heat consumption are dropped to by 1200~1400kcal/kg.cl
700~760kcal/kg.cl；System operatio is simple, and former, fuel cost declines；Hand labor intensity declines to a great extent, and automates journey
Degree is high, and systematic parameter is measurable and controllable.
Description of the drawings
Fig. 1 is the equipment signal using the utility model nepheline preheating predecomposition dry sintering production alumina clinker technique
Figure.
In figure：Dotted line with the arrow is airflow direction, and solid line with the arrow is stream direction；
The cyclone cylinder of 1- first order preheaters, the cyclone cylinder of the second level 2- preheater, the cyclone cylinder of 3- third level preheaters,
The cyclone cylinder of 4- fourth stage preheaters, the cyclone cylinder of 5- level V preheaters, 6- dore furnaces, 7-1- cylinder of rotary kiln, 7-2- kilns
Tail smoke-box, 7-3- wicket covers, 7-4- bypass devices, 8- grate-coolers, 9- kiln tail burners, 10- kiln hood burners, 11- tri-
Secondary air hose.
Specific implementation mode
For that can further appreciate that the invention, features and effects of the utility model, the following examples are hereby given, and coordinates
Detailed description are as follows for attached drawing：
Embodiment 1
A kind of technique of nepheline preheating predecomposition dry sintering production alumina clinker, includes the following steps：
One) it is respectively 30%, 60% and 10% stoichiometry by weight percentage by raw material nepheline, lime stone and white slurry
It is homogenized through grinding and raw material is made, the rate value of raw material is alkali aluminium ratio Na2O/Al2O3For 1.8-2.1, calcium silicon ratio CaO/SiO2For 0.9-
1.1；
Two) by step 1) obtained raw material send to preheater；Enter dore furnace after preheated device preheating to decompose, enter back into
The calcination temperature of calcined by rotary kiln, rotary kiln clinkering zone is 1200-1400 DEG C, and kiln residence time is 20-50 minutes；
Three) clinker after calcining enters grate-cooler cooling, obtains alumina clinker.
Wherein, the cooling air of grate-cooler exchanges heat with 1100-1400 DEG C of high temperature chamotte for going out rotary kiln, the high temperature of recuperation of heat
Air themperature is 800-1100 DEG C, wherein portion of air enters rotary kiln as Secondary Air, and portion of air enters as tertiary air
Dore furnace, respectively as the combustion air of rotary kiln and dore furnace fuel；The 800- that preheater comes out dore furnace and rotary kiln
1100 DEG C of exhaust gas carry out heat exchange with room temperature raw material, and preheated raw meal enters dore furnace decomposition, subsequently into calcined by rotary kiln, exhaust gas
Temperature minimum can be down to 280 DEG C of discharge preheaters through heat exchange.
Embodiment 2
As different from Example 1, raw material nepheline, lime stone and white slurry are respectively 45%, 55% by weight percentage
It is homogenized through grinding with 0% stoichiometry and raw material is made, the calcination temperature of rotary kiln clinkering zone is 1250-1350 DEG C, is stopped in kiln
Time is 30-40 minutes, and the cooling air of grate-cooler and 1100-1350 DEG C of high temperature chamotte for going out rotary kiln exchange heat.
Embodiment 3
As different from Example 1, raw material nepheline, lime stone and white slurry are respectively 35%, 60% by weight percentage
It is homogenized through grinding with 5% stoichiometry and raw material is made, the calcination temperature of rotary kiln clinkering zone is 1300-1400 DEG C, is stopped in kiln
Time is 20-35 minutes.
Embodiment 4
It is shown in Figure 1, using the equipment of above-mentioned technique productions alumina clinker, including preheater, dore furnace 6, revolution
Kiln, grate-cooler 8, preheater include the Pyatyi preheater being sequentially communicated, every grade of preheater include cyclone cylinder, connection air hose and under
The cyclone cylinder 4 of expects pipe, fourth stage preheater is connect by tremie pipe with dore furnace 6, and the outlet of dore furnace 6 is by connecting air hose and the
5 import of cyclone cylinder of Pyatyi preheater connects, and the cyclone cylinder 5 of level V preheater is connect by tremie pipe with kiln tail smoke-box 7-2,
The bottom of dore furnace 6 is connect with the kiln tail smoke-box 7-2 of rotary kiln tail portion, and kiln tail smoke-box 7-2 is equipped with bypass device 7-4,
For harmful components such as discharge section chlorine, alkali, grate-cooler 8 is connect with the wicket cover 7-3 on rotary kiln head, and grate-cooler 8 is can
The forth generation cooler for preventing clinker from deliquescing, 8 end of grate-cooler are exported equipped with alumina clinker.
The tapering of dore furnace 6 or lower prop are equipped with tertiary air unilateral side entrance, and are equipped in tertiary air unilateral side entrance top
Kiln tail burner 9, dore furnace 6 introduce fuel by kiln tail burner 9, the volume of dore furnace ensure gas residence time >=
5.0s。
Pass through the tertiary-air pipe 11 of 8 high temperature air of internal recovering grate-cooler and dore furnace unilateral side entrance at the top of wicket cover 7-3
Connection supply tertiary air, tertiary-air pipe 11 take wind at the top of wicket cover 7-3.
Tertiary-air pipe is equipped with flow control valve.
Wicket cover 7-3 is equipped with kiln hood burner 10, and rotary kiln introduces fuel, kiln hood burner by kiln hood burner 10
The ratio that feeding fuel accounts for total fuel is 30-50%.
Air valve and seasoning spreading box are equipped on tremie pipe.
Grate-cooler in this embodiment is forth generation cooler, is discharged from a side end, using preventing alumina clinker
Deliquesce the grate structure for blocking seam of combing.
The operation principle of above equipment：By nepheline, lime stone, white slurry dispensing raw material, it is sent into the rotation of first order preheater
The connection air hose of air duct 1, in the connection air hose of the cyclone cylinder 1 of first order preheater with high-temp waste gas carry out heat exchange, and by
The high-temp waste gas moved upwards, which is brought into the cyclone cylinder 1 of first order preheater, carries out gas solid separation, and the material isolated passes through
The tremie pipe of the cyclone cylinder 1 of first order preheater enters the connection air hose of the cyclone cylinder 2 of second level preheater, the exhaust gas after separation
Preheater is discharged；Material in the connection air hose of the cyclone cylinder 2 of second level preheater with high-temp waste gas carry out heat exchange, and by
The high-temp waste gas of upper movement, which is brought into the cyclone cylinder 2 of second level preheater, carries out gas solid separation, and the material isolated is by the
The tremie pipe of the cyclone cylinder 2 of two level preheater enters the connection air hose of the cyclone cylinder 3 of third level preheater, the exhaust gas after separation into
Enter the connection air hose of the cyclone cylinder 1 of first order preheater；Material sequentially enters cyclone cylinder 3, the fourth stage of third level preheater
The cyclone cylinder 4 of preheater, into excessively a series of heat exchange and gas solid separation, the tremie pipe of the cyclone cylinder 4 through fourth stage preheater
Into dore furnace 6；The gas-solid mixture that dore furnace 6 comes out, which enters, carries out gas solid separation in the cyclone cylinder 5 of level V preheater, warp
The tremie pipe of the cyclone cylinder 5 of level V preheater enters the kiln tail smoke-box 7-2 of rotary kiln, be sent into inside cylinder of rotary kiln 7-1 into
Row calcining generates alumina clinker；High temperature alumina clinker enters grate-cooler 8 by wicket cover 7-3, by the cooling of grate-cooler
It discharges to obtain qualified alumina clinker from end.
Embodiment 5
As different from Example 4, the top of grate-cooler 8 by the tertiary-air pipe 11 of internal recovering grate-cooler high temperature air with
Dore furnace unilateral side entrance connection supply tertiary air, tertiary-air pipe 11 take wind from 8 top of grate-cooler.
Embodiment 6
As different from Example 4, raw material are fed from the connection air hose of the cyclone cylinder 2 of second level preheater, cancel first
Grade preheater becomes level Four heat exchange, and use is dried for the grinding of raw material moisture >=6%.
Embodiment 7
As different from Example 4, raw material are fed from the connection air hose of the cyclone cylinder 3 of third level preheater, cancel first
Grade preheater and second level preheater become three-level heat exchange, and the grinding drying for raw material moisture >=8% uses or preheater
Front adds the broken raw material for being applicable in bigger moisture of drying.
The raw material of nepheline dispensing are carried out dry sintering using preheating predecomposition technology and obtain qualified products by the utility model,
Nepheline resource is improved to efficiently use, convenient for improving dependence of the alumina industry to bauxite, and by suspension preheating and kiln outside
Decomposing effectively reduces the energy consumption of system, expands the production potential of rotary kiln, is applicable in large-scale production and application.
Although the preferred embodiment of the utility model is described above in conjunction with attached drawing, the utility model is not
It is confined to above-mentioned specific implementation mode, the above mentioned embodiment is only schematical, is not restrictive, ability
The those of ordinary skill in domain is not departing from the utility model aims and claimed under the enlightenment of the utility model
Under ambit, many forms can also be made, these are belonged within the scope of protection of the utility model.
Claims (6)
1. a kind of equipment of nepheline preheating predecomposition dry sintering production alumina clinker, it is characterised in that：Including preheater, divide
Stove, rotary kiln, grate-cooler are solved, the preheater includes at least three-level preheater being sequentially communicated, and every grade of preheater includes rotation
Air duct, connection air hose and tremie pipe, the cyclone cylinder of penultimate stage preheater are connect by tremie pipe with dore furnace, the decomposition
Outlet of still is connect by connecting air hose with the cyclone cylinder import of final stage preheater, and the cyclone cylinder of the final stage preheater passes through blanking
Pipe is connect with kiln tail smoke-box, and the bottom of the dore furnace is connect with the kiln tail smoke-box of rotary kiln tail portion, and the kiln tail smoke-box is set
There are bypass device, the grate-cooler to be connect with the wicket cover on rotary kiln head, the grate-cooler is that clinker can be prevented damp
The forth generation cooler of solution, the grate-cooler end are exported equipped with alumina clinker.
2. the equipment of nepheline preheating predecomposition dry sintering production alumina clinker according to claim 1, feature exist
In：The tapering of the dore furnace or lower prop are equipped with tertiary air unilateral side entrance, and are equipped with kiln in tertiary air unilateral side entrance top
The volume of tail burner, the dore furnace ensures gas residence time >=5.0s.
3. the equipment of nepheline preheating predecomposition dry sintering production alumina clinker according to claim 2, feature exist
In：Pass through the tertiary-air pipe of internal recovering grate-cooler high temperature air and dore furnace unilateral side at the top of the wicket cover or at the top of grate-cooler
Entrance connection supply tertiary air.
4. the equipment of nepheline preheating predecomposition dry sintering production alumina clinker according to claim 3, feature exist
In：The tertiary-air pipe is equipped with flow control valve.
5. the equipment of nepheline preheating predecomposition dry sintering production alumina clinker according to claim 1, feature exist
In：The wicket cover is equipped with kiln hood burner, and the ratio that kiln hood burner feeding fuel accounts for total fuel is 30-50%.
6. the equipment of nepheline preheating predecomposition dry sintering production alumina clinker according to claim 1, feature exist
In：It is equipped with air valve and seasoning spreading box on the tremie pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721612824.XU CN207943888U (en) | 2017-11-28 | 2017-11-28 | The equipment that nepheline preheats predecomposition dry sintering production alumina clinker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721612824.XU CN207943888U (en) | 2017-11-28 | 2017-11-28 | The equipment that nepheline preheats predecomposition dry sintering production alumina clinker |
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| CN207943888U true CN207943888U (en) | 2018-10-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758712A (en) * | 2017-11-28 | 2018-03-06 | 天津水泥工业设计研究院有限公司 | The Processes and apparatus of nepheline preheating predecomposition dry sintering production alumina clinker |
| CN109373752A (en) * | 2018-10-24 | 2019-02-22 | 江苏鹏飞集团股份有限公司 | Variable diameter cement rotary kiln with function of recovering waste heat |
-
2017
- 2017-11-28 CN CN201721612824.XU patent/CN207943888U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107758712A (en) * | 2017-11-28 | 2018-03-06 | 天津水泥工业设计研究院有限公司 | The Processes and apparatus of nepheline preheating predecomposition dry sintering production alumina clinker |
| CN109373752A (en) * | 2018-10-24 | 2019-02-22 | 江苏鹏飞集团股份有限公司 | Variable diameter cement rotary kiln with function of recovering waste heat |
| CN109373752B (en) * | 2018-10-24 | 2020-08-28 | 江苏鹏飞集团股份有限公司 | Reducing cement rotary kiln with waste heat recovery function |
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