CN101921071A - Method for removing formed ring in rotary kiln coal powder injection - Google Patents
Method for removing formed ring in rotary kiln coal powder injection Download PDFInfo
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- CN101921071A CN101921071A CN 200910052759 CN200910052759A CN101921071A CN 101921071 A CN101921071 A CN 101921071A CN 200910052759 CN200910052759 CN 200910052759 CN 200910052759 A CN200910052759 A CN 200910052759A CN 101921071 A CN101921071 A CN 101921071A
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- China
- Prior art keywords
- rotary kiln
- kiln
- fuel
- forsterite
- ring
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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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/104—Ingredients added before or during the burning process
Abstract
The invention discloses a method for removing a formed ring in rotary kiln coal powder injection, comprising the following steps: mixing 5-50wt % of forsterite mineral powder and 50-95wt% of fuel coal powder used for a rotary kiln, evenly stirring, injecting the mixed fuel into the rotary kiln via the nozzle of the rotary kiln so as to form flame with the combustion temperature of 1300-1600 DEG C, and reacting the forsterite mineral powder with the ring formed position in the rotary kiln so as to gradually soften the formed ring until the formed ring is collapsed and damaged, and then discharged out of the rotary kiln along with the rotation of the rotary kiln, thereby ensuring normal production of the rotary kiln. In the invention, the forsterite mineral powder is combusted in the rotary kiln and then forms low melting point substances with kiln crust so as to separate the kiln crust from a kiln liner, thus effectively solving the ring formation problem when coal powder is used as a fuel for the rotary kiln, ensuring the normal production of the rotary kiln for calcinating active lime and being free of stopping the rotary kiln to manually remove the formed ring. In addition, the adopted fuel is just the one used by the rotary kiln device for the calcinating active lime, and the forsterite mineral powder has the advantages of wide raw material sources, abundant resources and low production cost.
Description
Technical field
The invention belongs to metallurgy lime rotary kiln technical field, particularly a kind of method of removing formed ring in rotary kiln coal powder injection.
Background technology
Formed ring in rotary kiln coal powder injection is a global difficult problem, and the method for handling ring formation both at home and abroad has plenty of the kiln of stopping and manually clears up kliner coating, and also useful abroad bullet is directly beaten on kliner coating, the way that kliner coating is shatter.Need stop kiln on the one hand and handle, waste time and energy, use bullet danger bigger on the other hand, not have the possibility of using at home.
It is to know ring formation of rotary kiln by scraping the circle machine that technology is also arranged, its principle is near the kiln tail of rotary kiln, one group of track is set, track is provided with dolly, dolly is provided with one can stretch into the removing arm that the rotary kiln circle forms the district, remove the arm front end and be provided with scraper, remove arm and scraper inside and be provided with cooling medium pass.Open an openning at the kiln tail of rotary kiln, will remove arm and scraper and stretch into kiln circle formation district in the rotary kiln, utilize the kinetic energy that rotation produced and the relative displacement of cylinder of rotary kiln, remove the kiln circle automatically or stop the kiln circle to form.This method is to belong to physical method, be not applied on the metallurgy lime large-sized rotary kiln, and the interior ring formation of the kiln of its processing is subjected to the limit on length and the hardness.
Summary of the invention
The purpose of this invention is to provide a kind of method of removing formed ring in rotary kiln coal powder injection, with forsterite breeze and the rotary kiln direct mixed firing of fuel industry coal dust, the hot ring formation of rotary kiln of removing; Fast, conveniently, the low-cost hot ring formation of removing rotary kiln inside, not only can guarantee does not need the ordinary production of active lime calcination rotary kiln to stop kiln and manually removes spinned circle; And the common problem of ring formation when effectively solving rotary kiln and using coal dust to act as a fuel, and production cost is low.
Technical scheme of the present invention is:
A kind of method of removing formed ring in rotary kiln coal powder injection, use the fuel coal dust to mix in 5～50% forsterite breeze and 50～95% rotary kilns earlier by weight percentage, stir, mixed fuel is sprayed into rotary kiln through the rotary kiln burner, form flame, temperature of combustion is 1300～1600 ℃, forsterite breeze and the reaction of ring formation of rotary kiln position, make ring formation softening gradually and destructions of caving in expels from kiln along with the rotation of rotary kiln, the ordinary production of maintenance rotary kiln.
Further, forsterite breeze and rotary kiln are mixed back stirring 10～30 minutes with the fuel coal dust, stir.
Again, MgO content 〉=38% in the described forsterite breeze, by weight percentage, forsterite breeze granularity is less than 0.2mm.
C content 〉=80% in the described fuel coal dust, by weight percentage, coal powder size is less than 0.1mm.
In the rotary kiln rotary course, though the bed of material directly contacts with kiln lining, various components stick on the kiln lining inevitable often in the kiln material, but because lacking, the kiln inner wall surface of " totally " adheres to the basis in the initial stage, fine particle and the dust in flue gas of having only light specific gravity, at first be attached on the refractory lining of kiln wall, the adhesion of this fines mainly is through mechanical deposit, forms through chemical bonding on a small quantity.
When rotary kiln normally moves, when the gentle grog rate of kiln was stablized, kliner coating can constantly stick and come off voluntarily, to protect stable kliner coating thickness.In case unbalance (melt content is too much, or the kiln temperature is higher, or fuel ash is big), the kliner coating change of properties, the grog particles no longer of a large amount of kliner coating parcels drops along moving on the kiln wall that is rotating then, but very firmly and constantly adheres to the kiln wall, finally forms ring formation.
Ring formation generally is meant the ring formation of clinkering zone and thermopositive reaction band intersection in the rotary kiln, the reason more complicated of ring formation, and the coefficient result of multiple often factor, but the formation mechanism of ring formation thing is now reached common understanding.The ring formation thing is actually one deck " kliner coating " that clinkering zone and thermopositive reaction band intersection hang up, and when " kliner coating " when tying certain thickness, has just formed circle.And kliner coating mainly by low melting point bonding mutually and the degradation production of Wingdale and the residual completely ore particle of unreacted and coal dust accumulation form.
After ring formation occurs, the one, influence kiln ventilation, the rising of CO concentration in flue gas can be quickened the growth of ring formation; The 2nd, different because of the thickness distribution of ring formation on circumference, the material that causes scurrying ring formation in kiln rotates is suddenly big or suddenly small, also influences clinker quality when influence the temperature of kiln head variation; The 3rd, the high-temperature material that sealing place of kiln tail spills not only causes the damage of sealing element, and the person or automatically controlled instrument and circuit are also worked the mischief; The 4th, in case when ring formation occurring local shedding being arranged, living phenomenon can appear running in kiln hood, the person or cooling machine and kiln hood dust-precipitator are all caused certain harm.
The present invention directly mixes forsterite breeze and coal dust, after the rotary kiln internal-combustion and kliner coating form low melting point, reduce bonding force between kliner coating and the kiln lining, make kliner coating separate with kiln lining, kliner coating is along with the rotation of rotary kiln expels from kiln.Because kliner coating has only composition to contain MgO, SiO in calcium oxide and the forsterite
2And Fe
2O
3Generate the low melting point phase Deng reaction, in operating process, be very easy to observe and red-tape operati, and because the kiln lining material contains MgO, between the low melting point of production and the furnace lining chemical erosion little, therefore can effectively prevent of the erosion of forsterite breeze to the furnace lining material of rotary kiln.
Beneficial effect of the present invention
The present invention uses the forsterite breeze to form low melting point with kliner coating after the rotary kiln internal-combustion, make kliner coating separate with kiln lining, the common problem of ring formation when effectively the solution rotary kiln uses coal dust to act as a fuel, guarantee the ordinary production of active lime calcination rotary kiln, do not need to stop kiln and manually remove spinned circle, and fuel of the present invention is the fuel that active lime calcination rotary kiln device itself is used, forsterite powder raw material wide material sources, aboundresources, production cost is low.
Embodiment
The present invention will be further described below by embodiment.
Embodiment 1
Use the fuel coal dust to mix in 5% forsterite breeze and 95% rotary kiln earlier by weight percentage, stirred 15 minutes, directly burn at the ring formation position of active lime calcination rotary kiln through fuel nozzle ports, temperature of combustion is 1350 ℃.Along with the powder mix of forsterite breeze and coal dust constantly sprays in the kiln, the circle of the original knot of rotary kiln is softening gradually and the destruction of caving in expels from kiln along with the rotation of rotary kiln.
Wherein: the MgO content 41% of forsterite powder, granularity is＜0.2mm; The C content 80% of described fuel coal dust, granularity is≤0.1mm.
Embodiment 2
Use the fuel coal dust to mix in 20% forsterite breeze and 80% rotary kiln earlier by weight percentage, stirred 20 minutes, directly burn at the ring formation position of active lime calcination rotary kiln through fuel nozzle ports, temperature of combustion is 1450 ℃.Along with the powder mix of breeze and coal dust constantly sprays in the kiln, the circle of the original knot of rotary kiln is softening gradually and the destruction of caving in expels from kiln along with the rotation of rotary kiln.
Wherein: the MgO content 39% of forsterite powder, granularity is＜0.2mm; The C content 82% of described fuel coal dust, granularity is≤0.1mm.
Embodiment 3
Use the fuel coal dust to mix in 35% forsterite powder and 65% rotary kiln earlier by weight percentage, stirred 25 minutes, directly burn at the ring formation position of active lime calcination rotary kiln through fuel nozzle ports, temperature of combustion is 1500 ℃.Along with the powder mix of forsterite breeze and coal dust constantly sprays in the kiln, the circle of the original knot of rotary kiln is softening gradually and the destruction of caving in expels from kiln along with the rotation of rotary kiln.
Wherein: the MgO content 40% of forsterite powder, granularity is＜0.2mm; The C content 81% of described fuel coal dust, granularity is≤0.1mm.
Embodiment 4
A kind of method to remove ring formation of rotary kiln for active lime calcination under the forsterite breeze high temperature.Use the fuel coal dust to mix in 50% forsterite powder and 50% rotary kiln earlier by weight percentage, stirred 28 minutes, directly burn at the ring formation position of active lime calcination rotary kiln through fuel nozzle ports, temperature of combustion is 1550 ℃.Along with the powder mix of forsterite breeze and coal dust constantly sprays in the kiln, the circle of the original knot of rotary kiln is softening gradually and the destruction of caving in expels from kiln along with the rotation of rotary kiln.
Wherein: the MgO content 38% of forsterite powder, granularity is＜0.2mm; The C content 84% of described fuel coal dust, granularity is≤0.1mm.
Forsterite raw material wide material sources, aboundresources that embodiment 1～4 is adopted, production cost is low.Forsterite breeze and fuel coal dust directly mix, spray into rotary kiln, after the kiln internal combustion and kliner coating at high temperature react the generation low melting point, reduce bonding force between kliner coating and the kiln lining, destroy the kliner coating structure, kliner coating is separated with kiln lining, kliner coating is along with the rotation of rotary kiln expels from kiln.Because kliner coating has only composition to contain MgO, SiO in calcium oxide and the forsterite
2And Fe
2O
3Generate the low melting point phase Deng reaction, in operating process, be very easy to observe and red-tape operati, and because the kiln lining material contains MgO, between the low melting point of production and the furnace lining chemical erosion little, therefore can effectively prevent of the erosion of forsterite breeze to the furnace lining material of rotary kiln.
Claims (4)
1. method of removing formed ring in rotary kiln coal powder injection, it is characterized in that, use the fuel coal dust to mix in 5～50% forsterite breeze and 50～95% rotary kilns earlier by weight percentage, stir, mixed fuel is sprayed into rotary kiln through the rotary kiln burner, form flame, temperature of combustion is 1300～1600 ℃, and forsterite breeze and the reaction of ring formation of rotary kiln position are softened and the destruction of caving in ring formation gradually, expel from kiln along with the rotation of rotary kiln, keep the ordinary production of rotary kiln.
2. method of removing formed ring in rotary kiln coal powder injection according to claim 1 is characterized in that, forsterite breeze and rotary kiln are mixed back stirring 10～30 minutes with the fuel coal dust, stirs.
3. method of removing lime rotary kiln coal powder injection ring formation according to claim 1 is characterized in that, MgO content 〉=38% in the described forsterite breeze, and by weight percentage, forsterite breeze granularity is less than 0.2mm.
4. method of removing formed ring in rotary kiln coal powder injection according to claim 1 is characterized in that, C content 〉=80% in the described fuel coal dust, and by weight percentage, coal powder size is less than 0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910052759 CN101921071B (en) | 2009-06-09 | 2009-06-09 | Method for removing ringing during coal powder injection in rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910052759 CN101921071B (en) | 2009-06-09 | 2009-06-09 | Method for removing ringing during coal powder injection in rotary kiln |
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| CN101921071A true CN101921071A (en) | 2010-12-22 |
| CN101921071B CN101921071B (en) | 2012-10-10 |
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| CN 200910052759 Active CN101921071B (en) | 2009-06-09 | 2009-06-09 | Method for removing ringing during coal powder injection in rotary kiln |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102649626A (en) * | 2012-05-15 | 2012-08-29 | 宝山钢铁股份有限公司 | Powdery material cyclic calcining system |
| CN102674716A (en) * | 2012-05-15 | 2012-09-19 | 宝山钢铁股份有限公司 | Cyclic calcining and decomposing process for powdered materials |
| CN114136112A (en) * | 2021-12-30 | 2022-03-04 | 安徽华塑股份有限公司 | Rotary kiln crust removing process |
| CN114480768A (en) * | 2022-01-21 | 2022-05-13 | 酒泉钢铁(集团)有限责任公司 | Online cleaning method for rotary kiln ring formation |
| CN114717372A (en) * | 2022-04-26 | 2022-07-08 | 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 |
-
2009
- 2009-06-09 CN CN 200910052759 patent/CN101921071B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146510A (en) * | 2011-03-07 | 2011-08-10 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102146510B (en) * | 2011-03-07 | 2012-12-19 | 攀枝花钢城集团有限公司 | Roasting method for controlling ring formation of rotary kiln |
| CN102649626A (en) * | 2012-05-15 | 2012-08-29 | 宝山钢铁股份有限公司 | Powdery material cyclic calcining system |
| CN102674716A (en) * | 2012-05-15 | 2012-09-19 | 宝山钢铁股份有限公司 | Cyclic calcining and decomposing process for powdered materials |
| CN102674716B (en) * | 2012-05-15 | 2013-09-04 | 宝山钢铁股份有限公司 | Cyclic calcining and decomposing process for powdered materials |
| CN102649626B (en) * | 2012-05-15 | 2014-07-23 | 宝山钢铁股份有限公司 | Powdery material cyclic calcining system |
| CN114136112A (en) * | 2021-12-30 | 2022-03-04 | 安徽华塑股份有限公司 | Rotary kiln crust removing process |
| CN114136112B (en) * | 2021-12-30 | 2023-08-15 | 安徽华塑股份有限公司 | Rotary kiln crust removal process |
| CN114480768A (en) * | 2022-01-21 | 2022-05-13 | 酒泉钢铁(集团)有限责任公司 | Online cleaning method for rotary kiln ring formation |
| CN114480768B (en) * | 2022-01-21 | 2023-02-24 | 酒泉钢铁(集团)有限责任公司 | Online cleaning method for rotary kiln ring formation |
| CN114717372A (en) * | 2022-04-26 | 2022-07-08 | 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 |
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|---|---|
| CN101921071B (en) | 2012-10-10 |
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