CN104019676B - A kind of method removing ring formation dross in chain grate machine��rotary kiln - Google Patents
A kind of method removing ring formation dross in chain grate machine��rotary kiln Download PDFInfo
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- CN104019676B CN104019676B CN201410253618.9A CN201410253618A CN104019676B CN 104019676 B CN104019676 B CN 104019676B CN 201410253618 A CN201410253618 A CN 201410253618A CN 104019676 B CN104019676 B CN 104019676B
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- rotary kiln
- ring formation
- dross
- chain grate
- formation dross
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Abstract
The present invention provides a kind of method removing ring formation dross in chain grate machine��rotary kiln, it is characterized in that, when the ring formation dross in rotary kiln exceedes limit value, the normal temperature finished ball being greater than conventional pellet input is directly inputted in rotary kiln from the opening for feed of rotary kiln. Its effect is: 1, remove ring formation dross effective; 2, cost is low; 3, on normal production schedule without impact; 4, the labour intensity of operator is alleviated; 5, energy-saving and environmental protection.
Description
Technical field: the present invention relates to a kind of method removing the stove kiln ring formation dross that its inwall produces in production operation, particularly a kind of method removing ring formation dross in chain grate machine��rotary kiln.
Technical background: chain grate machine��rotary kiln is in the production process of pelletizing, its inwall can produce ring formation dross gradually along with the carrying out of operation, ring formation is created on high-temperature roasting district more, it can cause the section of kiln to reduce, increase the resistance that in kiln, hot gas and material run, time serious, ring formation dross can as the hot wall of gear, make heat can not be transmitted to low-temperature end smooth and easyly, and high-temperature roasting district temperature is raised further, form vicious cycle, more knot is more serious to make ring formation, when in kiln, ring formation dross is too much, the load of transmission rig can be increased the weight of, reduce operating rate, affect seed output and quality, time serious, the stationary screen of kiln head can be blocked, cause the accident of shutdown. the method of existing process ring formation dross mainly contains: (1), cooling and heat are burnt and alternately burnt circle: the length and location regulating torch flame, thermal-flame is utilized to burn by ring formation, but this method is from general situation, effect is not satisfactory, and the speed that the speed that ring formation dross is eliminated does not grow is fast, (2), with water, ring formation is carried out quenching so that it is shrink uneven and come off, this method effect is better, but is difficult to, while producing, water is got to region thermal zone in kiln in enforcement, and in addition, water is also big especially to the infringement of kiln wall wadding, so, implementation prospect is not good, (3), stopping production process, by ring formation dross in the instrument manual removal kilns such as pneumatic pick, hammer drill, sledgehammer after the cooling that namely stops production, the deficiency of the method is, impact is produced, labour intensity is big, poor stability, the infringement of kiln wall wadding is also big.
Summary of the invention: the order of the present invention is, for the deficiency that the method for existing removal chain grate machine��ring formation of rotary kiln dross in use exists, and propose a kind of to implement easily, use simple, cost is low, the method for ring formation dross in the removal chain grate machine��rotary kiln of instant effect.
The object of the present invention can be realized by the following technical programs, a kind of method removing ring formation dross in chain grate machine��rotary kiln, it is characterized in that, when the ring formation dross in rotary kiln exceedes limit value, the normal temperature finished ball being greater than conventional pellet input is directly inputted in rotary kiln from the opening for feed of rotary kiln.
The limit value of the ring formation dross in described rotary kiln refers to: the height of ring formation dross is for higher than the above 20cm of kliner coating;
1 to 3 times that the input (weight, as follows) of every minute of the described normal temperature finished ball being greater than conventional pellet input is the normal input of chain grate machine pellet.
The parameter of described normal temperature finished ball is: diameter 8-16mm, ultimate compression strength is greater than 2500N/ ball.
For improving pellet intensity, reduce breakage rate, before adding normal temperature finished ball 15��25 minutes, the machine of chain grate machine speed is reduced by 25��50%.
Go circle to go knurl effect for improving, when the normal temperature finished ball entering kiln arrives the position of ring formation dross in rotary kiln, the rotating speed of rotary kiln is reduced by 30��70%.
The effect of the present invention is: 1, remove ring formation dross effective, this is, a certain amount of normal temperature finished ball is put in rotary kiln by present method, when these normal temperature finished balls arrive ring formation dross place, their temperature is far below the temperature of ring formation dross, ring formation dross can be produced the effect of a quenching by this huge temperature difference, thus makes ring formation dross produce crackle or split broken and come off, and reaches and removes ring formation dross effect; 2, cost is low, because it is without the need to adding other equipment, also without the need to adopting other raw material, and is only return a stove again with the finished ball produced, so, production cost impact is very micro-; 3, on normal production schedule without impact, also can not affect quantum of output and the quality of product because removal raw material be the finished ball produced, its composition is the same with the composition of pellet, can not produce pollute and affect its quality; 4, the labour intensity of operator is alleviated, because without the need to manually removing ring formation dross; 5, energy-saving and environmental protection, because it does not produce waste material in operation.
Below in conjunction with embodiment, the present invention is set forth further:
Embodiment:
Embodiment 1, a kind of method removing ring formation dross in chain grate machine��rotary kiln, chain grate machine��rotary kiln in the present embodiment is for producing 1200000 tons per year, the normal input of chain grate machine is 3 tons/minute, and the parameter of the normal temperature finished ball adopted is diameter 8��16mm, and ultimate compression strength is greater than 2500N/ ball; When the height of the ring formation dross in rotary kiln is 25cm, the machine of chain grate machine speed is reduced by 30%, after 20 minutes, the normal temperature finished balls of 30 tons are directly inputted in rotary kiln from the opening for feed of rotary kiln, when normal temperature finished ball arrives the position of ring formation dross in rotary kiln, the rotating speed of rotary kiln is reduced by 30% operation, until ring formation dross is removed.
Embodiment 2, a kind of method removing ring formation dross in chain grate machine��rotary kiln, chain grate machine��rotary kiln in the present embodiment is for producing 1200000 tons per year, the normal input of chain grate machine is 3 tons/minute, and the parameter of the normal temperature finished ball adopted is diameter 8��16mm, and ultimate compression strength is greater than 2500N/ ball, when the ring formation dross in rotary kiln is 35cm, the machine of chain grate machine speed is reduced by 30%, after 20 minutes, the normal temperature finished balls of 60 tons are directly inputted in rotary kiln from the opening for feed of rotary kiln, when normal temperature finished ball arrives the position of ring formation dross in rotary kiln, the rotating speed of rotary kiln is reduced by 50% operation, ring formation dross dropping situations is observed at kiln head vision slit, when in kiln, the ring formation dross amount of coming off is bigger, stop throwing in normal temperature finished ball, when the ring formation dross come off discharges blocking kiln head stationary screen from kiln head, kiln speed should be reduced again, remove after totally when the ring formation on kiln head stationary screen and put forward kiln speed again, throw in again after the ring formation dross come off in kiln is drained except circle materials, totally return to normal production after requiring until ring formation dross in kiln is removed.
Embodiment 3, a kind of method removing ring formation dross in chain grate machine��rotary kiln, chain grate machine��rotary kiln in present method is for producing 1200000 tons per year, the normal input of chain grate machine is 3 tons/minute, and the parameter of the normal temperature finished ball adopted is diameter 8��16mm, and ultimate compression strength is greater than 2500N/ ball;When the ring formation dross in rotary kiln is 50cm, the machine of chain grate machine speed is reduced by 30%, kiln speed is carried to the highest, this can reduce filling ratio in kiln, after 20 minutes, the normal temperature finished balls of 100 tons are directly inputted in rotary kiln from the opening for feed of rotary kiln, when normal temperature finished ball arrives the position of ring formation dross in rotary kiln, 70% that the rotating speed of rotary kiln is reduced to conventional rotating speed runs, until ring formation dross is removed.
Removing ring formation dross and preferably just start to throw material removal when the early stage i.e. 20cm of ring formation dross formation, control combines.
The normal temperature finished ball entering kiln looping removing dross does not fall kiln speed in the region that ring formation dross is few, and suitably improves kiln speed, reduces the contact of normal temperature finished ball and kliner coating, prevents because of too much kiln skin releasing, and cause the infringement of wadding.
Claims (6)
1. remove the method for ring formation dross in chain grate machine��rotary kiln for one kind, it is characterised in that, when the ring formation dross in rotary kiln exceedes limit value, the normal temperature finished ball being greater than every minute conventional pellet input is directly inputted in rotary kiln from the opening for feed of rotary kiln.
2. by a kind of method removing ring formation dross in chain grate machine��rotary kiln according to claim 1, it is characterised in that, the limit value of the ring formation dross in described rotary kiln refers to: the height of ring formation dross is for higher than the above 20cm of kliner coating.
3. by a kind of method removing ring formation dross in chain grate machine��rotary kiln according to claim 1, it is characterised in that, described in be greater than every minute of normal temperature finished ball of every minute conventional pellet input input be 1 to 3 times of the normal input of chain grate machine pellet.
4. by a kind of method removing ring formation dross in chain grate machine��rotary kiln according to claim 1, it is characterised in that, the parameter of described normal temperature finished ball is: diameter 8-16mm, ultimate compression strength is greater than 2500N/ ball.
5. by a kind of method removing ring formation dross in chain grate machine��rotary kiln according to claim 1, it is characterised in that, before adding normal temperature finished ball 15��25 minutes, the machine of chain grate machine speed is reduced by 25��50%.
6. by a kind of method removing ring formation dross in chain grate machine��rotary kiln described in claim 1 or 2 or 3 or 4 or 5, it is characterised in that, when the normal temperature finished ball entering kiln arrives the position of ring formation dross in rotary kiln, the rotating speed of rotary kiln is reduced by 30��70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410253618.9A CN104019676B (en) | 2014-05-27 | 2014-05-27 | A kind of method removing ring formation dross in chain grate machine��rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410253618.9A CN104019676B (en) | 2014-05-27 | 2014-05-27 | A kind of method removing ring formation dross in chain grate machine��rotary kiln |
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| Publication Number | Publication Date |
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| CN104019676A CN104019676A (en) | 2014-09-03 |
| CN104019676B true CN104019676B (en) | 2016-06-08 |
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| CN201410253618.9A Expired - Fee Related CN104019676B (en) | 2014-05-27 | 2014-05-27 | A kind of method removing ring formation dross in chain grate machine��rotary kiln |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114717372B (en) * | 2022-04-26 | 2023-07-21 | 酒泉钢铁(集团)有限责任公司 | High-temperature cleaning method for ring formation of rotary kiln for direct reduction of iron ore |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2818492Y (en) * | 2005-09-30 | 2006-09-20 | 唐山市磁石矿冶科贸有限公司 | Producer for oxidation pelletizing |
| CN102305614A (en) * | 2011-07-27 | 2012-01-04 | 中南大学 | Method for detecting and forecasting thickness of accretion of iron ore oxidized pellet rotary kiln |
| CN102927832A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Rotary kiln ring forming device |
| CN103322960A (en) * | 2013-06-26 | 2013-09-25 | 中冶长天国际工程有限责任公司 | Method and device for detecting thickness of ring forming layer of rotary kiln |
-
2014
- 2014-05-27 CN CN201410253618.9A patent/CN104019676B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2818492Y (en) * | 2005-09-30 | 2006-09-20 | 唐山市磁石矿冶科贸有限公司 | Producer for oxidation pelletizing |
| CN102305614A (en) * | 2011-07-27 | 2012-01-04 | 中南大学 | Method for detecting and forecasting thickness of accretion of iron ore oxidized pellet rotary kiln |
| CN102927832A (en) * | 2012-11-16 | 2013-02-13 | 鞍钢集团矿业公司 | Rotary kiln ring forming device |
| CN103322960A (en) * | 2013-06-26 | 2013-09-25 | 中冶长天国际工程有限责任公司 | Method and device for detecting thickness of ring forming layer of rotary kiln |
Non-Patent Citations (2)
| Title |
|---|
| 回转窑结圈的原因及处理方法;杨晓东;《烧结球团》;19980320(第02期);第44页 * |
| 范晓慧等.氧化球团链篦机―回转窑结圈机理的研究.《钢铁》.2008,(第03期), * |
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