CN1157272A - Process for preparing active lime and its after-treatment device - Google Patents
Process for preparing active lime and its after-treatment device Download PDFInfo
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- CN1157272A CN1157272A CN 96114235 CN96114235A CN1157272A CN 1157272 A CN1157272 A CN 1157272A CN 96114235 CN96114235 CN 96114235 CN 96114235 A CN96114235 A CN 96114235A CN 1157272 A CN1157272 A CN 1157272A
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Abstract
The present invention discloses a process for preparing active lime and its after-treatment equipment. Said process includes the following steps: feeding limestone into rotary kiln; spraying powdered coal at outlet end of the rotary kiln and calcining; calcination temp. is 1050-1400 deg.C; melting point of powdered coal is higher than calcination temp.. The described after-treatment equipment includes: cylindrical body, brick lining, baffle ring, hoisting structure and screen plate. Said invention can reduce the cost for preparing active lime, and said invented product possesses high CaO content and activity.
Description
The present invention relates to a kind of technology and after-treatment device thereof of producing quickened lime, belong to the calcining field of lime.
Quickened lime is not only the important source material of steel-making, but also can be widely used in industry such as process hides, papermaking, paint, coating.At present, the technology of active lime calcination and equipment have multiple, with the calcined by rotary kiln quickened lime is wherein a kind of, with this equipment active lime calcination have that good product quality, unit throughput are big, adaptability to raw material strong, advantages such as operation easily, but its fuel is geseous fuel or heavy oil, and geseous fuel and heavy oil resource relatively lack, and price is more expensive, have hindered popularization, the application of this advanced calciner and technology.If make fuel with the coal that price is lower, there be the pollution problem of coal dust again to quickened lime, make that the good quickened lime of calcining is second-rate, can not satisfy service requirements.
The objective of the invention is to overcome above-mentioned shortcoming of the prior art, a kind of technology of producing quickened lime and the after-treatment device thereof that can make fuel with resourceful coal is provided.
The object of the present invention is achieved like this:
A kind of technology of producing quickened lime is that Wingdale is added rotary kiln, and from the calcining of rotary kiln discharge end spray refuel, the fuel that spray adds is coal dust, and calcining temperature is 1050～1400 ℃, and the coal dust ash fusion point is greater than calcining temperature; The material that comes out from the rotary kiln discharge end obtains quickened lime behind autogenous grinding, cooling, separation dust and surface contaminant.
Coal powder size satisfies-200 orders 〉=92%, volatile content 〉=12%, coal dust calorific value 〉=24000KJ.
A kind of after-treatment device of realizing that above-mentioned technology is used, comprise cylindrical shell, lifting structure, bricking, comprise transition and two working zones of cooling, the cylinder inboard wall of transition section is built bricking, the cylinder inboard wall of cooling section evenly is equipped with the lifting structure, this device also has a mask work section after the cooling work section, segregation section is equipped with screen cloth along cylinder inboard wall, and has small opening on the corresponding cylindrical shell of screen cloth; The junction of transition section and cooling section is equipped with blocking material ring.
The mesh aperture of screen cloth is 3～5mm, and the aperture of small opening is greater than the mesh aperture of screen cloth.
Below the present invention is described in detail:
The Wingdale for preparing is added in the rotary kiln, the mounted angle of mat rotary kiln and turning effort, Wingdale is moved to discharge end from feed end, simultaneously, discharge end at rotary kiln sprays into coal dust and makes its burning, the vacuum fan of flue gas mat rotary kiln is taken out to feed end and the effusion rotary kiln from discharge end, discharge through chimney, in this process, Wingdale and hot flue gas inverse motion, by heat exchange methods such as radiative transfer, heat transfer by conduction, transmission of heat by convection, thereby Wingdale is heated to high temperature is sintered into quickened lime; Calcining temperature is 1050～1400 ℃, and the coal dust ash fusion point is greater than calcining temperature.If calcining temperature exceeds between this optimal zone, the living burning rate of lime or burning rate are increased, reduce the activity degree of quickened lime; If calcining temperature is higher than the coal dust ash fusion point, can bring the harm of two aspects: the one, cause grey fractional melting and with CaO, the SiO of lime
2Deng material react with and generate new compound and be attached to the surface of lime, thereby reduced in the quickened lime effective CaO and reduced the activity of lime; The 2nd, contain higher sulphur in the ash content, make that the sulphur content in the quickened lime increases, reduced the grade of lime.As seen, control coal dust physicochemical property and calcining temperature can reduce the pollution of coal dust to lime.But owing to reasons such as quality of pc and thermal system fluctuations, the quickened lime of discharging rotary kiln still may be subjected to the pollution of coal dust, utilizes after-treatment device further to eliminate this part pollutent.After the red heat quickened lime that calcining is good in the rotary kiln enters the transition section of after-treatment device, the effect of mat blocking material ring, material filling ratio in this section is increased, and the time lengthening that material is stopped in this section, thereby lime at slow refrigerative simultaneously, because the effect of after-treatment device rotation makes material expect abrasive material repeatedly in transition section, causes one deck bur on surface to come off; Because after-treatment device is to tilt to install, and does in the turning motion process at after-treatment device, material can be crossed blocking material ring from transition section and fall into cooling section.At cooling section, on the one hand, freezing air is drawn into from the after-treatment device discharge end, carry out heat exchange with material after, overflow and enter the combustion air of rotary kiln from the feed end of after-treatment device as coal dust; On the other hand, material is subjected to the effect of lifting structure and kicks up repeatedly, falls, make lime and freezing air that excellent contact be arranged, accelerate speed of cooling, the foreign material that adhere to the lime surface are broken away from, mat has certain speed to do the effect of the air of transverse movement, and the powder that transition section and cooling section split away off is taken out of after-treatment device with warm air, enters rotary kiln and discharges from chimney; When material arrives segregation section, cooled off and finished, superfine dust mat flowing air is eliminated, thick slightly powder can not be taken out of by air, in segregation section, screened out, spill the small opening of the powder that sifts out from the after-treatment device cylindrical shell, thereby obtain the quickened lime more purified, that activity degree is high at the discharge end of after-treatment device.
The present invention has following advantage than prior art: make fuel with aboundresources, cheap coal replacement resource shortage, gas or the heavy oil that price is more expensive, widened the fuel field of calcined by rotary kiln quickened lime technology; Owing to solved the pollution problem of coal dust firing to quickened lime, the peer-level when making the quickened lime quality of coming out as fuel production with coal dust reach to make fuel with gas or liquid has reduced the cost of producing quickened lime.
Accompanying drawing is a structure iron of producing the used after-treatment device of quickened lime technology.
Provide embodiments of the invention below:
After-treatment device comprises cylindrical shell 1, lifting structure 2, bricking 3, blocking material ring 4, screen cloth 5, this device is divided into transition, cooling, three working zones of separation, the cylinder inboard wall of transition section is built bricking 3, the cooling section cylinder inboard wall is equipped with lifting structure 2, and lifting structure 2 is hook solid, is equipped with blocking material ring 4 in the junction of transition section and cooling section, segregation section is equipped with screen cloth 5 along cylinder inboard wall, with have small opening 6 on the screen cloth 5 corresponding cylindrical shells, the mesh aperture of screen cloth is 3mm, the aperture of small opening is 5mm.Wingdale is added in the rotary kiln, add coal dust from the discharge end spray of rotary kiln, calcining temperature is 1060～1080 ℃, and the coal dust ash fusion point is 1100 ℃, and coal powder size satisfies-200 orders 〉=92%, volatile content is 13%, the coal dust calorific value is 24500KJ, and the lime that calcining is good enters after-treatment device, obtains quickened lime behind autogenous grinding, cooling, separation dust and surface contaminant, this quickened lime contains the CaO amount and can reach more than 90%, and activity degree can reach more than 350 milliliters.
Claims (4)
1. a technology of producing quickened lime is that Wingdale is added rotary kiln, and from the calcining of rotary kiln discharge end spray refuel, it is characterized in that: the fuel that spray adds is coal dust, and calcining temperature is 1050～1400 ℃, and the coal dust ash fusion point is greater than calcining temperature; The material that comes out from the rotary kiln discharge end obtains quickened lime behind autogenous grinding, cooling, separation dust and surface contaminant.
2. the technology of producing quickened lime according to claim 1 is characterized in that: coal powder size satisfies-200 orders 〉=92%, volatile content 〉=12%, coal dust calorific value 〉=24000KJ.
3. used after-treatment device of technology of realizing claim 1, comprise cylindrical shell, lifting structure, bricking, comprise transition and two working zones of cooling, the cylinder inboard wall of transition section is built bricking, the cylinder inboard wall of cooling section evenly is equipped with the lifting structure, it is characterized in that: this device also has a mask work section after the cooling work section, segregation section is equipped with screen cloth (5) along cylindrical shell (1) inwall, and has small opening (6) on the corresponding cylindrical shell of screen cloth (5); The junction of transition section and cooling section is equipped with blocking material ring (4).
4. after-treatment device according to claim 3 is characterized in that: the mesh aperture of screen cloth (5) is 3～5mm, and the aperture of small opening (6) is greater than the mesh aperture of screen cloth (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96114235 CN1157272A (en) | 1996-12-20 | 1996-12-20 | Process for preparing active lime and its after-treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96114235 CN1157272A (en) | 1996-12-20 | 1996-12-20 | Process for preparing active lime and its after-treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1157272A true CN1157272A (en) | 1997-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96114235 Pending CN1157272A (en) | 1996-12-20 | 1996-12-20 | Process for preparing active lime and its after-treatment device |
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| CN (1) | CN1157272A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325417C (en) * | 2005-03-04 | 2007-07-11 | 郑恒春 | Adhesive type granular lime calcination process |
| CN102476821A (en) * | 2010-11-30 | 2012-05-30 | 吉林化纤集团有限责任公司 | Production technology of calcium oxide by white mud |
| CN102992371A (en) * | 2012-11-29 | 2013-03-27 | 刘立文 | Equipment for producing calcium oxide through calcium sulfate |
| CN103030164A (en) * | 2012-11-27 | 2013-04-10 | 刘立文 | Technique and apparatus for producing calcium oxide from calcium sulfate |
| CN103058247A (en) * | 2013-01-14 | 2013-04-24 | 刘立文 | Equipment and technology for producing calcium oxide by using calcium sulfate |
| CN103058244A (en) * | 2012-12-17 | 2013-04-24 | 刘立文 | Technology and device of producing calcium oxide by using calcium sulfate under high temperature and low pressure |
| CN103101953A (en) * | 2012-12-28 | 2013-05-15 | 刘立文 | Equipment for producing calcium oxide by using gypsum |
| CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
| CN111807726A (en) * | 2020-06-23 | 2020-10-23 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
| CN114053927A (en) * | 2021-10-29 | 2022-02-18 | 广西欧神诺陶瓷有限公司 | Preparation method of ceramic tile bottom blank powder |
-
1996
- 1996-12-20 CN CN 96114235 patent/CN1157272A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325417C (en) * | 2005-03-04 | 2007-07-11 | 郑恒春 | Adhesive type granular lime calcination process |
| CN102476821A (en) * | 2010-11-30 | 2012-05-30 | 吉林化纤集团有限责任公司 | Production technology of calcium oxide by white mud |
| CN103030164A (en) * | 2012-11-27 | 2013-04-10 | 刘立文 | Technique and apparatus for producing calcium oxide from calcium sulfate |
| CN103030164B (en) * | 2012-11-27 | 2015-03-11 | 刘立文 | Technique and apparatus for producing calcium oxide from calcium sulfate |
| CN102992371A (en) * | 2012-11-29 | 2013-03-27 | 刘立文 | Equipment for producing calcium oxide through calcium sulfate |
| CN102992371B (en) * | 2012-11-29 | 2014-12-24 | 刘立文 | Equipment for producing calcium oxide through calcium sulfate |
| CN103058244B (en) * | 2012-12-17 | 2015-01-28 | 刘立文 | Technology and device of producing calcium oxide by using calcium sulfate under high temperature and low pressure |
| CN103058244A (en) * | 2012-12-17 | 2013-04-24 | 刘立文 | Technology and device of producing calcium oxide by using calcium sulfate under high temperature and low pressure |
| CN103101953A (en) * | 2012-12-28 | 2013-05-15 | 刘立文 | Equipment for producing calcium oxide by using gypsum |
| CN103101953B (en) * | 2012-12-28 | 2014-12-24 | 刘立文 | Equipment for producing calcium oxide by using gypsum |
| CN103058247B (en) * | 2013-01-14 | 2014-12-24 | 刘立文 | Equipment and technology for producing calcium oxide by using calcium sulfate |
| CN103058247A (en) * | 2013-01-14 | 2013-04-24 | 刘立文 | Equipment and technology for producing calcium oxide by using calcium sulfate |
| CN104844020A (en) * | 2015-05-08 | 2015-08-19 | 湖南衡山皕成钙业有限公司 | Method for producing high-efficient active lime |
| CN111807726A (en) * | 2020-06-23 | 2020-10-23 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
| CN111807726B (en) * | 2020-06-23 | 2022-04-29 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Sectional vertical type high-activity calcium oxide cooling device and method |
| CN114053927A (en) * | 2021-10-29 | 2022-02-18 | 广西欧神诺陶瓷有限公司 | Preparation method of ceramic tile bottom blank powder |
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