CN103880302B - A kind of processing method of producing quickened lime - Google Patents
A kind of processing method of producing quickened lime Download PDFInfo
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- CN103880302B CN103880302B CN201410058693.XA CN201410058693A CN103880302B CN 103880302 B CN103880302 B CN 103880302B CN 201410058693 A CN201410058693 A CN 201410058693A CN 103880302 B CN103880302 B CN 103880302B
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- rotary kiln
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 25
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 25
- 239000004571 lime Substances 0.000 title claims abstract description 25
- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 238000001354 calcination Methods 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 14
- 235000019738 Limestone Nutrition 0.000 claims abstract description 13
- 239000006028 limestone Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims abstract description 6
- 239000003034 coal gas Substances 0.000 claims description 8
- 239000011449 brick Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- XADCESSVHJOZHK-UHFFFAOYSA-N Meperidine Chemical compound C=1C=CC=CC=1C1(C(=O)OCC)CCN(C)CC1 XADCESSVHJOZHK-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Furnace Details (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a kind of processing method of producing quickened lime, its step first carries out powdered process to raw material limestone, and the raw material that will enter preheater is no longer occurred with the shape of block stone; At follow-up elementary calcining, slaking calcination stage, the complete aged result that the continuous calcining operation be made up of preheater, precalcining device, rotary kiln produces is that legacy equipment and production technique are incomparable; Moreover, the heat insulation layer structure on rotary kiln inner chamber body surface and bulge-structure make rotary kiln heat-insulating property be better than routine techniques, and the projection of its kiln intracoelomic cavity can make material powder obtain fully all stirring in rotary kiln production process, thus make the raising of calcining effect optimization again.
Description
Technical field
The present invention relates to a kind of method of being produced Calcium of intensifiens by technique means such as Vertical Mill, preheater, precalcining, gas burning rotary kilns, especially a kind of processing method of producing quickened lime.
Background technology
Active Lime Rotary Kiln system has that output is high, lime quality good and stable, can calcine the advantage of the aspects such as little grade Wingdale.China's lime production industry has had wide variation, has introduced the rotary kiln of German Crouse Ma Fei company, MIT, Metso Company of the U.S. one after another; The MAERZ lime kiln of Mai Erzi company of Switzerland, the sleeve kiln of former Beckenbach company of Germany, the twin beams kiln of Fu Kasi company of Italy and " beam bridge " sleeve kiln, and two " D " kiln, the suspension kiln of German Bai Li Hughes Electronics, the beam type kiln of Italian Fo Lida company, the coke kilns of SUMITOMO CHEMICAL company of Italian Lyceum company.While introduction, the rotary kiln of domestic-developed, MAERZ lime kiln, sleeve kiln, beam type kiln, Novel air burnt lime vertical kiln, Novel coke lime shaft kiln, middle stone shaft kiln, geneva kiln are also extensively promoted.Below wherein, the luxuriant and rich with fragrance type (KMAG) of Crouse one agate of Germany and the tall and erect type (KVS) of U.S.'s dolantin, the length-to-diameter ratio (L/D) that Mitsubishi Heavy Industries Ltd's band chain comb preheating machine of Japan and limestone kiln (vertical wave you type) these three kinds of kiln types of grate cooler all belong to predecomposition is two grades or the third gear traditional structure rotary kiln of 11 ~ 15, the predecomposition rate of Wingdale is 20% ~ 25%, maximum 30%, hear rate >=1100Kcal/kg.Ca0, optimum feed stock granularity is 15 ~ 45mm.But it is large that its shortcoming is floor space, and hear rate high and low calorific value of gas utilization ratio is low, and this have impact on the application of rotary kiln lime system to a certain extent.Especially after entering 21 century, along with the high speed development of national economy, the problems such as the low-carbon environment-friendly that China's quickened lime production industry faces, comprehensive utilization of resources, tail gas comprehensive utilization, reduction construction investment are the new problems that rotary kiln quickened lime production technical field is wanted to solve.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of processing method of producing quickened lime.And solve the problem that predecomposition rate is low, gas utilization rate is low, hear rate is high of Wingdale when producing quickened lime in this approach.
For this reason, the technical scheme that the present invention solves described problem is: a kind of processing method of producing quickened lime, comprises step:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone obtained by step (1) is through the rubble of the broken diametrically 8-10mm of hammer-crusher, and hammer-crusher break-up frequency is 400T/h;
(3) rubble input vertical mill grinding step (2) obtained, the limestone powder making < 3mm that sieves enter feed bin;
(4) powder step (3) obtained by after bag-type dust through feed bin input height >=70m's and the preheater had between more than two calcining zones carries out preheating;
(5) provide coal gas to carry out elementary calcining to the powder from preheater by coal-gas producer to splitter outside preheater kiln and carry out decomposed in precalcining device, temperature is set in 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down to be provided with in protruding rotary kiln and to carry out slaking calcining, temperature is set in 850 ° of C-1150 ° of C therebetween;
(7) quickened lime product is obtained by rotary kiln discharge hole for discharge.
Preferably, described preheater is two or more between its calcining zone had, and is shaped separately between each calcining zone, is mutually independent and is interconnected by pipeline.
Preferably, the combustion chamber of more than two is provided with in the fuel element be made up of preheater and precalcining device;
Preferably, the internal chamber wall refractory brick of described rotary kiln is provided with its shape protruding is waviness, trapezoidal or trilateral;
Preferably, the velocity of rotation of described rotary kiln is more than 2.5 revs/min or 2.5 revs/min;
Compared to existing technology, the positively effect that the present invention produces is: be first carry out powdered process to raw material limestone, the raw material that will enter preheater is no longer occurred with the shape of block stone; At follow-up elementary calcining, slaking calcination stage, the complete aged result that the continuous calcining operation be made up of preheater, precalcining device, rotary kiln produces is that legacy equipment and production technique are incomparable; Moreover, the heat insulation layer structure on rotary kiln inner chamber body surface and bulge-structure make rotary kiln heat-insulating property be better than routine techniques, and the projection of its kiln intracoelomic cavity can make material powder obtain fully all stirring in rotary kiln production process, thus make the raising of calcining effect optimization again.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the processing method of the production quickened lime (calcium oxide) that the present invention relates to.
Embodiment
Launching to be necessary to analyze before the embodiment of the present invention conventional calcination Wingdale technique in the past and even the problem also existed now: Wingdale reaches 30%, residue 70% decomposing and calcining in rotary kiln at the most high energy of the predecomposition rate of traditional shaft preheater.Rotary kiln belongs to open type calciner, and Wingdale constantly rolls in rotary kiln, be conducive to size granularity Wingdale uniform calcination, but Wingdale and flue gas is based on radiation heat transfer, needs>=1350
othe calcining temperature of C, because limestone kiln is protected without kliner coating, simplified surface temperature is up to 300
omore than C, the heat lost by radiation of cylindrical shell is about 150kcal/kgCa0, accounts for 13% ~ 15% of system overall heat consumption.And preheater is based on convective heat exchange, though heat exchange area is large, flue-gas temperature is required relatively not high, therefore, the surface radiating of preheater and the thermosteresis of leakage loss be only the simplified heat radiation of rotary kiln ten/-.
How to improve the predecomposition rate of Wingdale, concerning lumpy material: one is improve predecomposition temperature, and two is ensure enough warm up time.From the rotary system of band shaft preheater, increase preheater height and just can ensure warm up time.And improve predecomposition temperature and have two kinds of methods: first method improves kiln exit gas temperature, and the associated components such as such kiln tail feed chute, kiln quarter badge must ability 1200
omore than C high temperature, and propose higher requirement to the resistance to air loss of kiln tail sealing device and high thermal resistance, to ensure that it is in use unlikelyly burned.Such a process increases manufacture difficulty and cost.Second method keeps kiln exit gas temperature-resistant, and at preheater, place sets up Secondary Heat Source, namely as " kiln tail one is the fire " of new type nonaqueous cement system, to improve the thermo-efficiency of predecomposition temperature and exchange flue gas.The flue-gas temperature that Secondary Heat Source provides is 1200
oabout C, lower than the calcining temperature in kiln, low calorie fuels (as blast furnace or coal gas of converter) can be used and the coal gas utilizing producer gas generator to produce is more efficient, significantly can improve Wingdale predecomposition rate, reduce calcinating fuel amount in rotary kiln, shorten residence time of material, thus make the corresponding reduction of rotary kiln specification, simplified surface heat radiating loss reduces greatly.
Consider the factors such as preheater materialbeds comminution, waste gas outlet temperature, given enter the flue-gas temperature of preheater be between 1150 ~ 1200 DEG C, Wingdale residence time in preheater is 3.5 ~ 4 hours, preheating temperature in suitable raising preheater, and under ensureing the condition of enough warm up time, the predecomposition rate of Wingdale in preheater can be increased substantially.
So far, see Fig. 1, the enforcement of its step of processing method of the present invention's said production quickened lime (calcium oxide) has fully demonstrated feature of the present invention.Such as, from raw limestone, the step process of technique is:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone obtained by step (1) is through the rubble of the broken diametrically 8-10mm of hammer-crusher, and hammer-crusher break-up frequency is 400T/h;
(3) rubble input vertical mill grinding step (2) obtained, the limestone powder making < 3mm that sieves enter feed bin;
(4) powder step (3) obtained by after bag-type dust through feed bin input height >=70m's and the preheater had between more than two calcining zones carries out preheating;
(5) provide coal gas to carry out elementary calcining to the powder from preheater by coal-gas producer to precalcining device and carry out decomposed in precalcining device, temperature is set in 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down to be provided with in protruding rotary kiln and to carry out slaking calcining, temperature is set in 850 ° of C-1150 ° of C therebetween;
(7) quickened lime product is obtained by rotary kiln discharge hole for discharge.
For burning quality, the present invention redesigns single storehouse shaft preheater and firing system, be secondary preheater or the above preheater of secondary by preheater design, specifically, for the burning quality promoting pulverulent lime stone, compared with the prior art, the present invention the calcination space in preheater is designed to independently, be shaped separately and each other by preheater that pipeline is connected; In practice can by these independently calcination space be referred to as progression preheater, this preheater comprises the quantity of calcination space to have what calcination space just can determine; In addition, according to calcining amount, the height dimension of shaft preheater also can locate limit for height, preferably can be set to height >=70m; Number of combustion chambers in fuel element between preheater and precalcining device can be set to more than two.Simultaneously, in solution rotary kiln rotating speed problem, present invention employs friction gear, it is more than 2.5 revs/min or 2.5 revs/min that its velocity of rotation can be set to, so, the rotary kiln of 75 tons even if always weigh for l000t/d limestone kiln, transmission mechanism, also be manufacture and the installation costs that can greatly reduce rotary kiln than legacy equipment the present invention, and maintenance cost can make kiln transmission surface of base reduce 1/4 ~ 1/2 simultaneously, greatly reduce the civilwork engineering quantity of kiln foundation pier, thus reduce the integrated engineering cost of rotary kiln.
Consider the relation of systemic resistance, kiln end temperature and the predecomposition rate in best calcining process parameter, the dynamic process of rotary kiln actual production and process thereof, the present invention is except redesigning preheater internal structure, again design has also been carried out to the internal structure of rotary kiln, such as, rotary kiln internal chamber wall refractory brick being provided with convex design is waviness, trapezoidal or trilateral, the thermal insulation layer on rotary kiln internal chamber wall is designed to the high aluminum fiber lagging material of thickness between 3-40mm.
Proved by above embodiment, according to the processing method of production quickened lime of the present invention, the technique level of conventional calcination Wingdale can be promoted greatly.The predecomposition rate of Wingdale can be brought up to more than 70% by 30%, simultaneously, utilize the present invention can make different grain size Wingdale uniform calcination in rotary kiln, and under the prerequisite redesigning preheater, precalcining device, rotary kiln, rotary kiln device specification is reduced, reduce the simplified surface heat loss of kiln, thus greatly reduce system hear rate.Under the outflow resistance of preheater waste gas and the substantially constant condition of temperature, make system hear rate by below 1150kcal/kgCa0 to 950kcal/kgCa0.
Claims (5)
1. produce a processing method for quickened lime, comprise step:
(1) raw material limestone of diameter 300-400mm is sent into washing pool washing through conveyer;
(2) the clean work stone obtained by step (1) is through the rubble of the broken diametrically 8-10mm of hammer-crusher, and hammer-crusher break-up frequency is 400T/h;
(3) rubble input vertical mill grinding step (2) obtained, the limestone powder making < 3mm that sieves enter feed bin;
(4) powder step (3) obtained by after bag-type dust through feed bin input height >=70m's and the preheater had between more than two calcining zones carries out preheating;
(5) provide coal gas to carry out elementary calcining to the powder from preheater by coal-gas producer to precalcining device and carry out decomposed in precalcining device, temperature is set in 300 ° of C-800 ° of C therebetween;
(6) be input to that kiln intracoelomic cavity has a 3-40mm thickness thermal insulation layer and kiln intracoelomic cavity wall refractory brick through the powder of destroyer breaks down to be provided with in protruding rotary kiln and to carry out slaking calcining, temperature is set in 850 ° of C-1150 ° of C therebetween;
(7) quickened lime product is obtained by rotary kiln discharge hole for discharge.
2. the processing method of production quickened lime according to claim 1, is characterized in that, is provided with the combustion chamber of more than two between described preheater and precalcining device.
3. the processing method of production quickened lime according to claim 1, is characterized in that, described preheater is two or more between its calcining zone had, and is shaped separately between each calcining zone, is mutually independent and is interconnected by pipeline.
4. the processing method of production quickened lime according to claim 1, is characterized in that, it is waviness, trapezoidal or trilateral that the internal chamber wall refractory brick of described rotary kiln is provided with its shape protruding.
5. the processing method of production quickened lime according to claim 1, is characterized in that, the velocity of rotation of described rotary kiln is more than 2.5 revs/min or 2.5 revs/min.
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| CN201410058693.XA CN103880302B (en) | 2014-02-21 | 2014-02-21 | A kind of processing method of producing quickened lime |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066606A (en) * | 2015-09-05 | 2015-11-18 | 吉首大学 | Waste heat drying rotary kiln |
| CN107055535A (en) * | 2017-04-20 | 2017-08-18 | 杜金厂 | A kind of powder calcium oxide and carbon dust decompose calcium carbide device and its technique |
| CN107619203B (en) * | 2017-09-28 | 2020-06-16 | 广西华洋矿源材料有限公司 | Production method of active calcium oxide |
| CN108358471A (en) * | 2018-02-26 | 2018-08-03 | 山西太钢不锈钢股份有限公司 | A method of solving the ditch group lime stone explosion of horse man |
| CN108467211A (en) * | 2018-06-19 | 2018-08-31 | 郑小华 | A kind of active lime and its production technology |
| CN110639430A (en) * | 2019-10-15 | 2020-01-03 | 宁夏洪腾科技开发有限公司 | Recarburizer granulating system for comprehensively utilizing fine powder of calcined coal furnace |
| CN110976040B (en) * | 2019-12-04 | 2021-04-13 | 句容市星辰新型材料有限公司 | Environment-friendly limestone powder production process |
| CN113185152A (en) * | 2021-04-28 | 2021-07-30 | 浙江钙科机械设备有限公司 | High-quality calcium oxide grading suspension calcination production line and suspension calcination process thereof |
| CN114315179A (en) * | 2021-12-20 | 2022-04-12 | 米长山 | Process for producing active lime |
| CN114162822A (en) * | 2022-01-12 | 2022-03-11 | 米长山 | Process for producing calcium carbide |
| CN114804186A (en) * | 2022-05-16 | 2022-07-29 | 吴江市威士达铜业科技有限公司 | Production method and production device of copper oxide |
| CN115974430B (en) * | 2023-03-17 | 2023-06-20 | 山西富渊通科技有限公司 | Vertical active lime calciner and use method thereof |
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| CN101445333A (en) * | 2008-11-25 | 2009-06-03 | 中信重工机械股份有限公司 | Method for calcining active lime by taking tail gas from sealing type calcium carbide furnace as fuel for rotary kiln |
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