CN101929798B - Sintering equipment for producing alumina - Google Patents
Sintering equipment for producing alumina Download PDFInfo
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- CN101929798B CN101929798B CN2009100883352A CN200910088335A CN101929798B CN 101929798 B CN101929798 B CN 101929798B CN 2009100883352 A CN2009100883352 A CN 2009100883352A CN 200910088335 A CN200910088335 A CN 200910088335A CN 101929798 B CN101929798 B CN 101929798B
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Abstract
The invention discloses sintering equipment for producing alumina. The equipment comprises a rotary kiln, a burner, a cooler, a cooler dust collector, a primary cooling fan and a secondary cooling fan, wherein the rotary kiln is provided with a head end and a tail end; the burner is connected with the head end of the rotary kiln to supply fuel to the rotary kiln; the cooler is arranged at the head end of the rotary kiln and used for cooling sintered clinker discharged from the rotary kiln; the air inlet of the cooler dust collector is connected with the cooled tail gas outlet of the cooler; the air inlet of the primary cooling fan is connected with the air outlet of the cooler dust collector while the air outlet is connected with the cooler so as to blow hot clean tail gas dedusted by the cooler dust collector to the cooler; and the air outlet of the secondary cooling fan is connected with the cooler to blow air of which the temperature is lower than that of the hot clean tail gas to the cooler. The clinker sintered by the sintering equipment has the advantages of high alumina dissolution rate, low cost and good cyclic economic benefit.
Description
Technical field
The present invention relates to a kind of agglomerating plant, relate in particular to a kind of agglomerating plant that is used to produce aluminium oxide.
Background technology
Aluminium oxide is the primary raw material of electrolysis aluminium metallurgy.The production overwhelming majority of current aluminium oxide adopts bauxite as raw material, and production method mainly is a Bayer process, and minority adopts sintering process, Bayer-sintering series process etc.
In the technology that adopts sintering process or Bayer-sintering producing alumina through series process, need carry out sintering to raw material or Bayer process red mud, adopt agglomerating plant to carry out sintering traditionally usually with rotary kiln, carry out stripping to burning till grog then.
From rotary kiln discharge to burn till clinker temperature very high, therefore need cool off before the stripping carrying out.Utilize cooler to carry out once cooling naturally traditionally to burning till grog.But once the dissolution rate that burns till grog of cooling is low naturally, thereby has influenced the production efficiency of aluminium oxide, and cost is high.
In addition, rotary kiln is advanced in stove by sintering feed and the order handled can be divided into four zones, promptly drying belt, divide ungird, clinkering zone and salband.
When carrying out sintering work; Because the temperature of temperature, especially clinkering zone in the rotary kiln is high, so the sintering feed of high temperature is bonded on the inwall of rotary kiln easily; The ring formation of sintering feed on the rotary kiln inwall promptly takes place; Particularly with dividing the part place that ungirds adjacent ring formation taking place more easily at clinkering zone, therefore influenced normally carrying out of sintering, needs often to safeguard.When ring formation is serious, even sintering can't carry out.In addition when ring formation acquires a certain degree; The ring formation sintering feed comes off from the kiln wall; Form very big egg type piece, this egg type piece damages agglomerating plant easily in descending process; For example can damage the kiln body of rotary kiln and/or be used to cool off the cooling device that burns till grog, and can bring potential safety hazard to operating personnel.For this reason, conventional sintering equipment need be provided with air bubble or Cinder crusher usually, and it is broken to be used for that excessive in the rotary kiln burnt till the grog piece.Increase the structure and the complicated operation degree of agglomerating plant, caused production cost to increase.
Summary of the invention
The present invention is intended to solve at least one of said technical problem of the prior art.For this reason, an order of the present invention is to propose a kind ofly can improve the agglomerating plant that aluminium oxide is produced in dissolution rate and low being used to of cost.
To achieve these goals, the present invention proposes a kind of agglomerating plant that is used for alumina producing, comprises rotary kiln, and said rotary kiln has head end and tail end; Burner, said burner link to each other with the head end of said rotary kiln in rotary kiln, to supply with fuel; The head end place that is arranged on rotary kiln is used to cool off the cooler that burns till grog of discharging from rotary kiln; The cooler dust arrester, the air inlet of said cooler dust arrester links to each other with the outlet of the cooled exhaust gas of cooler; A cooling blower, the air inlet of a said cooling blower link to each other with the gas outlet of cooler dust arrester and air outlet links to each other with cooler so that the clean tail gas of heat after the dedusting of cooler dust arrester is blown into cooler; With the secondary cooling blower, the air outlet of said secondary cooling blower links to each other with cooler to blow the air that temperature is lower than the clean tail gas of said heat to cooler.
According to agglomerating plant of the present invention, burn till grog through the classification cooling from what rotary kiln was discharged, promptly at first utilize the clean tail gas of heat after the cooled exhaust gas dedusting that grog produces of burning till on the cooler to be blown into cooler and once to cool off to burning till grog; Carry out the secondary cooling to burning till grog utilizing the secondary cooling blower to blow the air (for example normal temperature air) that temperature is lower than the clean tail gas of above-mentioned heat then to cooler; Progressively grog is burnt till in cooling thus, and the inventor finds, through progressively cooling; The dissolution rate of sintered clinker aluminium oxide when stripping can be improved; Improve production efficiency thus, reduced cost, practiced thrift raw material.Simultaneously, also circulation has effectively utilized the waste heat in the cooled exhaust gas that burns till the grog generation, has practiced thrift the energy, has realized efficiency of cycling economy.
The agglomerating plant that is used to produce aluminium oxide according to the present invention also has following additional technical feature:
Said cooler is an inflating beam grid formula cooler.
Utilize inflating beam grid formula cooler through the circulated air cooling, and through blowing the wind of different temperatures, grog is burnt till in the classification cooling, digesting efficiency of alumina improves, and is effective.
The agglomerating plant that is used for alumina producing according to the present invention further comprises the tail end dust arrester, said tail end dust arrester advance that mouth links to each other with the tail end of said rotary kiln and the dust mouth of said tail end dust arrester links to each other with the head end of rotary kiln so that the isolated a part of kiln ash of tail end dust arrester turns back in the rotary kiln from the head end of rotary kiln.
Because the head end of the isolated a part of kiln ash of tail end dust arrester from rotary kiln turned back in the rotary kiln; Especially said a part of kiln ash is delivered to the place of easy ring formation in the rotary kiln from the head end of rotary kiln; For example said a part of kiln ash turns back to clinkering zone and divides on the rotary kiln inwall at the part place that ungirds adjacent, because kiln ash temperature is low relatively, so sintering feed is not on the inwall of rotary kiln; Reduce or eliminate the ring formation of sintering feed on the inwall of rotary kiln thus; Elimination finishes the potential safety hazard of astragal, and, reduce or eliminate ring formation through the kiln ash; Can not increase the cost of agglomerating plant greatly yet, and can not come adverse influence sintering.
The agglomerating plant that is used for alumina producing according to the present invention further comprises between the head end of the dust mouth that is arranged on the tail end dust arrester and rotary kiln and is used for said a part of kiln ash is blown into the soot blower in the rotary kiln.
Through soot blower said a part of kiln ash is blown in the rotary kiln place of ring formation easily, can be reliably the kiln ash be turned back in the rotary kiln place of ring formation easily.
Said head end is provided with the head end cover, and tail end is provided with tail end cover and the flue that links to each other with the tail end cover, and the mouth that advances of tail end dust arrester links to each other with flue.
Put flue through head end cover and tail end cover being set respectively at head end and tail end and being covered with, can better the flue gas in the rotary kiln be collected in the tail end dust arrester at tail end.
Said tail end dust arrester comprises whirlwind tube and cottrell, wherein the whirlwind tube advance that mouth links to each other with said flue and the outlet flue of whirlwind tube links to each other with the mouth that advances of cottrell, wherein said soot blower links to each other with the dust mouth of cottrell.
Through whirlwind tube and cottrell are set; The flue gas of discharging from the rotary kiln tail end at first passes through whirlwind tube one-time dedusting; Can remove the kiln ash of the about 80-90% in the flue gas; And then through cottrell flue gas is carried out final dusting, thereby the dustiness in the gas of discharging reduces greatly, has reduced the pollution to environment.
Said soot blower also links to each other with the dust mouth of whirlwind tube optionally the isolated a part of kiln ash of whirlwind tube is turned back in the rotary kiln from head end.
Soot blower not only all turns back to the isolated kiln ash of cottrell in the rotary kiln; If the isolated kiln ash of cottrell amount can not meet the demands; Then soot blower can turn back to the isolated a part of kiln ash of whirlwind tube in the rotary kiln, improves the reliability that reduces or reduce ring formation.
Between the dust mouth of said soot blower and whirlwind tube, be connected with valve.Through controlling said valve, just can control easily and whether the isolated kiln ash of whirlwind tube is turned back in the rotary kiln.
The dust mouth of whirlwind tube also links to each other with the tail end of rotary kiln so that the isolated residue kiln of whirlwind tube ash is turned back in the rotary kiln from tail end.
Through the tail end of the isolated residue kiln of whirlwind tube ash from rotary kiln turned back in the rotary kiln, recycle kiln ash has reduced environmental pollution, has improved economic benefit, need not to handle in addition the kiln ash in addition.
Said cooler dust arrester is an electric cleaner.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize through practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage obviously with are easily understood becoming the description of embodiment from combining figs, wherein:
Fig. 1 is the sketch map according to the agglomerating plant that is used for alumina producing of the embodiment of the invention;
Fig. 2 is the sketch map that is used for the agglomerating plant of alumina producing according to another embodiment of the present invention.
The specific embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
The agglomerating plant of describing according to the embodiment of the invention with reference to figure 1 below 100.
As shown in Figure 1, comprise rotary kiln 1, burner 2, cooler 10,15, cooler 12a of cooler dust arrester, 12b, secondary cooling blower 12c, 12d and tail end dust arrester 14 according to the agglomerating plant 100 of the embodiment of the invention.
Burner 2 links to each other with the head end (right-hand member among Fig. 1) of rotary kiln 2; Be used in rotary kiln 2, supplying with fuel; For example burner 2 is a coal burner; In rotary kiln 2, supply with coal dust and contain the oxygen air through coal dust roots blower 3, certainly, also can utilize independent blower fan in rotary kiln 2, to supply with and contain the oxygen air.For example can be used for the series process alumina producing according to the agglomerating plant 100 of the embodiment of the invention and raw material are sintered into burn till grog, but the present invention is not limited to this.
The cooled exhaust gas outlet of the air inlet of cooler dust arrester 15 and cooler 10, the for example outlet of the seal closure of cooler 10 links to each other, thereby the cooled exhaust gas that burns till the grog generation that is positioned on the cooler 10 is carried out dedusting.In an example of the present invention, cooler dust arrester 15 can be electric cleaner.A cooler 12a; The air inlet of 12b links to each other and their air outlet and cooler 10 with the gas outlet of cooler dust arrester 15; The air inlet of the seal closure of cooler 10 for example; Link to each other, thereby the clean tail gas of the heat after the dedusting of cooler dust arrester 15 is blown into cooler 10, once cool off burning till grog.Cooler dust arrester 15 isolated dust from cooled exhaust gas is discharged and is collected through the dust mouth.In Fig. 1, though show two cooling blowers, the present invention is not limited to this, a cooling blower that can any suitable quantity.Here, so-called " once cooling " is exactly with the higher air of temperature sintered clinker to be forced cooling.
The present inventor finds; Through burning till grog with the clean tail gas cooling of the higher heat of temperature earlier; And then burn till grog with the cooling of the lower air of temperature, in follow-up stripping, the dissolution rate of aluminium oxide can improve; For example the dissolution rate of aluminium oxide can improve about 3-5%, thereby has improved production efficiency.And recycle burn till the waste heat in the cooled exhaust gas of grog, do not increase cost, efficiency of cycling economy improves, the utilization rate of bauxite improves.
The mouth 141 that advances of tail end dust arrester 14 links to each other with the tail end (left end among Fig. 1) of rotary kiln 2; And the dust mouth of tail end dust arrester 14 links to each other with the head end of rotary kiln 2; For example; The dust mouth of tail end dust arrester 14 links to each other with an end of pipeline, and the other end of pipeline stretches into preset distances in the rotary kiln 2 from the head end of rotary kiln 2, and the outlet flue 142 of tail end dust arrester 14 is used to discharge the flue gas after the dedusting.Thus, tail end dust arrester 14 isolated a part of kiln ashes turn back in the rotary kiln 2 from the head end of rotary kiln 2.More specifically, said a part of kiln ash turns back to the place that ring formation takes place in the rotary kiln 2 easily.In an example of the present invention; The dust mouth of tail end dust arrester 14 links to each other with soot blower 3; Thereby utilize soot blower 3 that tail end dust arrester 14 isolated a part of kiln ashes are turned back in the rotary kiln 2, for example be blown on the inwall of the rotary kiln 2 that the ring formation place takes place in the rotary kiln 2 easily, in this example; The other end of the pipeline in the head end from rotary kiln 2 stretches into rotary kiln 2 can be provided with the nozzle (not shown), is used to spray the inwall that the kiln ash is ejected into rotary kiln 2.In addition, tail end dust arrester 14 isolated residue kiln ashes can collect.Alternatively, the outlet of tail end dust arrester 14 can also link to each other with the tail end of rotary kiln 2 so that tail end dust arrester 14 isolated residue kiln ashes are turned back in the rotary kiln 2 from the kiln tail end, thereby recycle kiln ash, reduced pollution.
Rotary kiln 2 can be divided into four zones vertically substantially: drying belt 1a, divide ungird 1b, clinkering zone 1c and salband 1d.
Through utilizing soot blower 3 to turn back in the rotary kiln 2 tail end dust arrester 14 isolated a part of kiln ashes, can reduce or eliminate the ring formation in the revolution 2 from head end.More specifically; The a part of kiln ash that returns from tail end dust arrester 14 for example can be blown on the inwall of clinkering zone 1b and the rotary kiln 2 that divides the adjacent part of 1a that ungirds; Because the temperature of kiln ash is low relatively, so sintering feed is not easy to be bonded on the inwall in the rotary kiln 2, reduced or eliminated the ring formation of sintering feed on rotary kiln 2 inwalls; Avoided the influence of ring formation, reduced the potential safety hazard that ring formation brings the damage and the ring formation of agglomerating plant sintering.
As shown in Figure 1; In an example of the present invention, be respectively equipped with head end cover 4 and tail end cover 5 at the head end of rotary kiln 2 and tail end, and also be provided with the flue 6 that links to each other with tail end cover 5 at tail end; Through head end cover 4 and tail end cover 5 and flue 6 are set, the flue gas of being convenient to rotary kiln 2 is collected.Flue 6 also links to each other with the mouth that advances of tail end dust arrester 14, thereby flue gas can get in the tail end dust arrester 14 in flue 6, has avoided the leakage of flue gas.
With reference to figure 2 agglomerating plant is according to another embodiment of the present invention described below.In the embodiment shown in Figure 2, tail end dust arrester 14 comprises whirlwind tube 7 and cottrell 8.Whirlwind tube 7 advance that mouth links to each other with flue 6 and the outlet flue of whirlwind tube links to each other with the mouth 81 that advances of cottrell 8, soot blower 3 links to each other with the dust mouth of cottrell 8.Thereby flue gas process cottrell 8 final dustings through whirlwind tube 7 one-time dedustings have reduced the kiln ash content in the discharging flue gas, have reduced environmental pollution.Discharge from the outlet flue 82 of cottrell 8 through the flue gas after cottrell 8 dedustings.Whirlwind tube 7 can be removed in the flue gas kiln ash greater than 80-90%, and cottrell 8 can be removed the kiln ash of remaining 10-20% in the flue gas.Cottrell 8 isolated kiln ashes all turn back in the rotary kiln 2 from the kiln hood end through soot blower 3.
As shown in Figure 2, in an example of the present invention, soot blower 3 also links to each other with the dust mouth of whirlwind tube 7 optionally whirlwind tube 7 isolated a part of kiln ashes are turned back in the rotary kiln 2 from head end.For example, when cottrell 8 isolated kiln ash amounts can not satisfy the requirement that reduces or eliminates ring formation in the rotary kiln 2, can whirlwind tube 7 isolated a part of kiln ashes be turned back in the rotary kiln 2 from head end.For this reason, between the dust mouth of soot blower 3 and whirlwind tube 7, be connected with valve 9, can control easily through by-pass valve control 9 and return the kiln ash to rotary kiln 2 from whirlwind tube 7.
In the further example of the present invention, the dust mouth of whirlwind tube 7 also links to each other with the tail end of rotary kiln 2 so that whirlwind tube 7 isolated residue kiln ashes are turned back in the rotary kiln 2 from tail end.If certainly whirlwind tube 7 isolated kiln ashes do not turn back in the rotary kiln 2 from head end, then whole kiln ashes all turns back in the rotary kiln 2 from tail end, thus recycle the kiln ash, practiced thrift raw material, reduced environmental pollution.Other structures of agglomerating plant embodiment illustrated in fig. 2 and operation are not described in detail with embodiment illustrated in fig. 1 identical here.
Although illustrated and described embodiments of the invention; Those having ordinary skill in the art will appreciate that: under the situation that does not break away from principle of the present invention and spirit, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited claim and equivalent thereof.
Claims (10)
1. an agglomerating plant that is used for alumina producing is characterized in that, comprises rotary kiln, and said rotary kiln has head end and tail end; Burner, said burner link to each other with the head end of said rotary kiln in rotary kiln, to supply with fuel; The head end place that is arranged on rotary kiln is used to cool off the cooler that burns till grog of discharging from rotary kiln; The cooler dust arrester, the air inlet of said cooler dust arrester links to each other with the outlet of the cooled exhaust gas of cooler; A cooling blower, the air inlet of a said cooling blower link to each other with the gas outlet of cooler dust arrester and air outlet links to each other with cooler so that the clean tail gas of heat after the dedusting of cooler dust arrester is blown into cooler; With the secondary cooling blower, the air outlet of said secondary cooling blower links to each other with cooler to blow the air that temperature is lower than the clean tail gas of said heat to cooler.
2. the agglomerating plant that is used for alumina producing as claimed in claim 1 is characterized in that, said cooler is an inflating beam grid formula cooler.
3. the agglomerating plant that is used for alumina producing as claimed in claim 1; It is characterized in that; Further comprise the tail end dust arrester, said tail end dust arrester advance that mouth links to each other with the tail end of said rotary kiln and the dust mouth of said tail end dust arrester links to each other with the head end of rotary kiln so that the isolated a part of kiln ash of tail end dust arrester turns back in the rotary kiln from the head end of rotary kiln.
4. the agglomerating plant that is used for alumina producing as claimed in claim 3 is characterized in that, further comprises between the head end of the dust mouth that is arranged on the tail end dust arrester and rotary kiln being used for said a part of kiln ash is blown into the soot blower in the rotary kiln.
5. the agglomerating plant that is used for alumina producing as claimed in claim 4 is characterized in that said head end is provided with the head end cover, and tail end is provided with tail end cover and the flue that links to each other with the tail end cover, and the mouth that advances of tail end dust arrester links to each other with flue.
6. the agglomerating plant that is used for alumina producing as claimed in claim 5; It is characterized in that; Said tail end dust arrester comprises whirlwind tube and cottrell; Wherein the whirlwind tube advance that mouth links to each other with said flue and the outlet flue of whirlwind tube links to each other with the mouth that advances of cottrell, wherein said soot blower links to each other with the dust mouth of cottrell.
7. the agglomerating plant that is used for alumina producing as claimed in claim 6 is characterized in that, said soot blower also links to each other with the dust mouth of whirlwind tube optionally the isolated a part of kiln ash of whirlwind tube is turned back in the rotary kiln from head end.
8. the agglomerating plant that is used for alumina producing as claimed in claim 7 is characterized in that, between the dust mouth of said soot blower and whirlwind tube, is connected with valve.
9. the agglomerating plant that is used for alumina producing as claimed in claim 7 is characterized in that, the dust mouth of whirlwind tube also links to each other with the tail end of rotary kiln so that the isolated residue kiln of whirlwind tube ash is turned back in the rotary kiln from tail end.
10. the agglomerating plant that is used for alumina producing as claimed in claim 1 is characterized in that, said cooler dust arrester is an electric cleaner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100883352A CN101929798B (en) | 2009-06-26 | 2009-06-26 | Sintering equipment for producing alumina |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100883352A CN101929798B (en) | 2009-06-26 | 2009-06-26 | Sintering equipment for producing alumina |
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| CN101929798A CN101929798A (en) | 2010-12-29 |
| CN101929798B true CN101929798B (en) | 2012-08-22 |
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| CN2009100883352A Active CN101929798B (en) | 2009-06-26 | 2009-06-26 | Sintering equipment for producing alumina |
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| CN109704373B (en) * | 2019-03-13 | 2021-06-08 | 国家电投集团山西铝业有限公司 | Aluminum oxide clinker sintering process and aluminum oxide clinker |
Citations (6)
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| US4365953A (en) * | 1979-07-17 | 1982-12-28 | Claudius Peters Ag | Cooler for combustible material |
| US4715188A (en) * | 1985-06-28 | 1987-12-29 | F. L. Smidth & Co. A/S | Method and cooler for cooling granular material |
| US5775891A (en) * | 1994-05-30 | 1998-07-07 | Babcock Materials Handling Division Gmbh | Grate cooler for combustion material and process for its operation |
| CN101294773A (en) * | 2008-06-10 | 2008-10-29 | 中冶北方工程技术有限公司 | Hot wind complete circulation type waste heat recovery utilization process and equipment of sintering cooler |
| CN101403571A (en) * | 2008-11-21 | 2009-04-08 | 中冶长天国际工程有限责任公司 | Circular cooler flue gas recycling method and system, and circular cooler |
| CN201463514U (en) * | 2009-06-26 | 2010-05-12 | 中国恩菲工程技术有限公司 | Sintering unit for producing alumina |
-
2009
- 2009-06-26 CN CN2009100883352A patent/CN101929798B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4365953A (en) * | 1979-07-17 | 1982-12-28 | Claudius Peters Ag | Cooler for combustible material |
| US4715188A (en) * | 1985-06-28 | 1987-12-29 | F. L. Smidth & Co. A/S | Method and cooler for cooling granular material |
| US5775891A (en) * | 1994-05-30 | 1998-07-07 | Babcock Materials Handling Division Gmbh | Grate cooler for combustion material and process for its operation |
| CN101294773A (en) * | 2008-06-10 | 2008-10-29 | 中冶北方工程技术有限公司 | Hot wind complete circulation type waste heat recovery utilization process and equipment of sintering cooler |
| CN101403571A (en) * | 2008-11-21 | 2009-04-08 | 中冶长天国际工程有限责任公司 | Circular cooler flue gas recycling method and system, and circular cooler |
| CN201463514U (en) * | 2009-06-26 | 2010-05-12 | 中国恩菲工程技术有限公司 | Sintering unit for producing alumina |
Non-Patent Citations (1)
| Title |
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| JP特开2003-192405A 2003.07.09 |
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