CN104773967B - Cement clinker calcining method - Google Patents
Cement clinker calcining method Download PDFInfo
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- CN104773967B CN104773967B CN201410162763.6A CN201410162763A CN104773967B CN 104773967 B CN104773967 B CN 104773967B CN 201410162763 A CN201410162763 A CN 201410162763A CN 104773967 B CN104773967 B CN 104773967B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The invention discloses a cement clinker calcining method. The method utilizes a predecomposition dry method cement kiln technology and comprises a raw material grinding process, a preheating system preheating process, a decomposing furnace decomposition process and a rotary kiln solid phase reaction process. A preheating system carries out N-stage preheating processes, wherein in raw material grinding, a calcareous raw material and an auxiliary raw material are respectively ground and respectively fed, the calcareous raw material is fed into the preheating system and is preheated, after N-1 stage preheating processes, the calcareous raw material is fed into a decomposition furnace and is decomposed, the decomposed calcareous raw material is fed into a Nth stage preheating process section of the preheating system, then is fed into a rotary kiln and undergoes a solid phase reaction, the auxiliary raw material is directly fed into the Nth stage preheating process section of the preheating system or into the tail part of the rotary kiln and then undergoes a solid phase reaction with the calcareous raw material. The method can reduce energy consumption, improve a yield and clinker quality, can flexibly adjust a decomposing furnace temperature suitable for different raw material characteristics, prevents preheater scaling and reduces head coal and total coal use amounts. The method is suitable for popularization and utilization in the field.
Description
Technical field
The present invention relates to a kind of cement clinker calcining method is and in particular to a kind of given birth to using predecomposition dry-process cement rotary kiln technique
The method producing clinker.
Background technology
Native shaft kiln occurs, (Britain orchid Pehanorm-f ransome) in rotary kiln within 1885, and nineteen twenty-eight occurs vertical for 1824
Bohr kiln, suspension preheater in nineteen fifty, nsp kiln within 1971, and that is, cement clinker calcining process experienced from vertical
The transformation of kiln → wet-process rotary kiln → preheater kiln → nsp kiln.Predecomposition dry-process cement rotary kiln technique refers to that coal is being divided with cement raw material
Through 850～900 DEG C of combustion decomposition in solution stove, enter rotary kiln and go out cement in 1400～1500 DEG C of participation solid state reaction final production
The production Technology of grog.
Cement raw material is divided into calcareous raw material and auxiliary material, described calcareous raw material refer to chemical composition mainly with
caco3Based on raw material, in terms of cao content generally 45～56%, such as limestone, marl, Chalk, shell etc., China's water
Mud corporate boss will use limestone.Described auxiliary material generally includes glutinous earthy raw materials and correction material；Glutinous earthy raw materials, chemistry
Composition is mainly with sio2Based on (50～70%), the such as natural resources such as clay, loess, shale, siltstone, river silt, also industry
Waste residue succedaneum, such as gangue, flyash, red mud, blast-furnace cinder etc..Correction material, mainly includes ferro-controlling raw material, siliceous
Correction material, aluminous correcting material.Ferro-controlling raw material, chemical composition is mainly with fe2o3Based on (being not less than 40%), such as sulfur ferrum
Slag, Copper Slag, iron ore, lead ore residue etc.；Silico-regulating material, chemical composition is mainly with sio2Based on (70～85%), such as
Sandstone, siltstone, fluvial sand, and kieselguhr, tripolit, opal etc.；Aluminous correcting material, chemical composition is mainly with al2o3
Based on (being not less than 30%), such as low-grade bauxite, cinder, bastard coal etc..
Nowadays, existing predecomposition dry-process cement rotary kiln technique is generally all as shown in Figure 1 or similar, and cement raw material is by regulation ratio
After example metering, grinding becomes raw material, is then fed into raw material homogenizing silo, raw material are sent to pre-heating system and enter by requirement according to production capacity again
Row is dried.Described pre-heating system has multistage preheating procedure, therefore also includes several preheaters, and preheater is all generally whirlwind
Cylinder, shown in accompanying drawing 1 for the c5 level V preheating procedure after c1-c4 level Four preheating procedure and dore furnace, preheater specifically includes
C11a, c12a, c11b, c12b, c2a, c2b etc..Raw material enter dore furnace after c1-c4 level Four preheating procedure and are decomposed, so
After enter back into afterbody c5 preheating after Zhongdao rotary kiln carry out solid state reaction, go out finished product grog after cooled device for discharging.
In predecomposition dry-process cement rotary kiln technique the flow process of hot blast and material move towards contrast, after conditioning Tower, finally enter kiln tail receive
Dirt device.The Main Function of preheater is substantially dehydration, the low-temperature decomposition of adjuvant, and dore furnace Main Function is substantially dividing of Calcium Carbonate
Solution, the effect of rotary kiln is substantially solid state reaction, but the effect of existing technique rotary kiln at present, in addition to carrying out solid state reaction, is gone back
Limestone for 10% about provides the effect decomposed.
Cement industry did not change since Japanese invention nsp kiln substantially from 1971, and cyclone cylinder is (i.e. above-mentioned
Preheater), the heat exchange area of dore furnace suspended state than piling up big by more than 2,000 times of state in rotary kiln, be that a kind of efficient heat exchange sets
Standby.Because existing process adopts compound to enter dore furnace, the low melting points such as alkali, sulfur are led to start that liquid phase occurs, material is sent out
Viscous, resolution ratio is hovered between 90-95%.And undecomposed complete raw material occupy more space in rotary kiln, make equipment body
Long-pending change is big, and efficiency reduces.
With scientific and technical development, and the needs of market and environment, at present energy-conservation, reduction of discharging, consumption reduction are proposed more
High requirement.A large amount of discharges also serious environment pollution of nox in predecomposition dry-process cement rotary kiln technique, in order to limit the discharge of nox
Concentration, also increases the cost producing clinker to a certain extent.
Content of the invention
The technical problem to be solved is to provide one kind ripe using predecomposition dry-process cement rotary kiln technique productions cement
The method of material, the method yield is high, energy consumption is low, and the cement clinker strength of production is high.
The technical solution adopted for the present invention to solve the technical problems is:
Cement clinker calcining method, using predecomposition dry-process cement rotary kiln technique, pre- including raw material grinding operation, pre-heating system
Thermal technology's sequence, dore furnace decomposition process, rotary kiln solid state reaction operation, described pre-heating system includes n level preheating procedure, raw material grinding
When calcareous raw material and auxiliary material separated grinding and separate feeding, calcareous raw material feeding pre-heating system is preheated,
Enter dore furnace after the preheating of n-1 level to decompose, subsequently into n-th grade of preheating procedure of pre-heating system, eventually enter into rotary kiln
Carry out solid state reaction；Auxiliary material is fed directly into n-th grade of preheating procedure or the rotary kiln of pre-heating system, final and calcium carbonate
Raw material carries out solid state reaction together.
Wherein, in said method, the scope of n is 3～8.
Wherein, in said method, when the siliceous raw material contents of free si in raw material is more than 65%, the grinding of siliceous raw material
Fineness was that the screen over-size of 0.08mm sieve is less than 12%.
Wherein, said method dore furnace decompose and the operation of rotary kiln solid state reaction in, head coal consumption and tail coal consumption
Ratio is 20～25 weight portion 75～80 weight portion.
The invention has the beneficial effects as follows:
The production technology of the present invention, calcareous raw material individually enters dore furnace, under the complete decomposition condition of carbonate, permissible
Flexible regulation decomposition furnace outlet temperature；And adjuvant raw material completes to preheat in n-th grade of preheating procedure, realize preheater and decomposition
Stove individually preheating and decomposition, and rotary kiln individually plays the effect of solid state reaction and sintering, has both decomposed complete with solid state reaction
Separate, reduce reaction activity, improve chemical reaction velocity, thus can expand the solid state reaction time, extend material in clinkering zone
The time of staying, make c3S physically well develops, and increases clinker strength and yield to a certain extent.
Limestone in raw material needs substantial amounts of heat when decomposing, and auxiliary material only needs to be preheating to corresponding temperature and back
Rotary kiln participates in reacting, so the present invention separates feeding and more fully can thermally decompose limestone in advance, improves limestone
Resolution ratio, improves yield, and reducing energy consumption.It will be appreciated by persons skilled in the art that auxiliary material is directly entered revolution
Kiln kiln tail also can play above-mentioned effect.
Brief description
Fig. 1 is existing predecomposition dry-process cement rotary kiln process chart；
Fig. 2 is the process chart of cement clinker calcining method one of which embodiment of the present invention.
In figure is labeled as: 1 is preheater, 2 is dore furnace, 3 is rotary kiln, 4 is conditioning Tower, 5 is adjuvant homogenizing storehouse.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
First, existing predecomposition dry-process cement rotary kiln technique is generally all as shown in Figure 1 or similar, and cement raw material is by regulation ratio
After example metering, grinding becomes raw material, is then fed into raw material homogenizing silo (powder-grinding process and homogenizing storehouse are omitted in FIG), according to production capacity
Raw material are sent to pre-heating system by requirement again is dried.Described pre-heating system has multistage preheating procedure, if therefore also including
A dry preheater 1, preheater 1 is generally all cyclone cylinder, shown in accompanying drawing 1 for c1-c4 level Four preheating procedure and dore furnace 2 after
C5 level V preheating procedure, preheater 1 specifically includes c11a, c12a, c11b, c12b, c2a, c2b etc. in fig. 1.Raw material warp
Enter dore furnace 2 after c1-c4 level Four preheating procedure to be decomposed, then enter back into Zhongdao rotary kiln after afterbody c5 preheating
3 carry out solid state reaction, go out finished product grog after cooled device for discharging.The flow process of hot blast and thing in predecomposition dry-process cement rotary kiln technique
That expects moves towards contrast, finally enters kiln tail dust-precipitator after conditioning Tower 4.The Main Function of preheater 1 be substantially dehydration, auxiliary
The low-temperature decomposition of material, dore furnace 2 Main Function is substantially the decomposition of Calcium Carbonate, and the effect of rotary kiln 3 is substantially solid state reaction, but
In addition to carrying out solid state reaction, the limestone also for 10% about provides the work decomposing for the effect of existing technique rotary kiln at present
With.
As shown in Fig. 2 the method for burning clinker of cement of the present invention, can significantly find out from the contrast of Fig. 1 and Fig. 2, this
To essentially consist in auxiliary material be not that same calcareous raw material together feeds to the difference of invention, and present invention process is by auxiliary material
Separate grinding, subsequently into adjuvant homogenizing storehouse 5, then enters back into c5 level V preheating procedure or kiln tail is mixed with calcareous raw material
(technique that auxiliary material is directly entered kiln tail does not identify in fig. 2).
Specifically, cement clinker calcining method, using predecomposition dry-process cement rotary kiln technique, including raw material grinding operation, pre-
Hot systems preheating procedure, dore furnace decomposition process, rotary kiln solid state reaction operation, described pre-heating system includes n level preheating procedure,
During raw material grinding, calcareous raw material and auxiliary material are separated grinding and separate feeding, calcareous raw material feeding pre-heating system enters
Row preheating, enters dore furnace 2 after the preheating of n-1 level and decomposes, subsequently into n-th grade of preheating procedure of pre-heating system, finally enter
Enter rotary kiln and carry out solid state reaction；Auxiliary material is fed directly into n-th grade of preheating procedure or rotary kiln 3 kiln tail of pre-heating system,
Carry out solid state reaction eventually together with calcareous raw material.
Using production technology of the present invention, calcareous raw material individually carries out multistage preheating, decreases auxiliary material and together preheats
Required energy consumption；Calcareous raw material individually enters dore furnace, can flexibly adjust decomposition furnace outlet temperature, therefore be suitable for
Dore furnace 1 outlet temperature (to high-alkali, high-sulfur raw material, can be controlled at 950 DEG C about, thus solving by different material characteristic
Coating clogging problem, and the raw materials and fuel low to harmful components such as sulfur, alkali, can control dore furnace 1 outlet temperature at 1100 DEG C
Left and right, increases substantially firing system yield, improves clinker quality), and realize preheater 1 and dore furnace 2 individually preheat and
Decomposition, and rotary kiln 3 individually plays the effect of solid state reaction and sintering, had both decomposed and has been kept completely separate with solid state reaction, reduces anti-
Answer activation energy, improve chemical reaction velocity, thus also can expand the solid state reaction time, extend material in the clinkering zone time of staying,
Increase clinker strength and yield to a certain extent.
Calcareous raw material in raw material needs substantial amounts of heat when decomposing, and auxiliary material only needs to be preheating to accordingly
Temperature enters rotary kiln and participates in reacting, so the present invention separates feeding and more fully can thermally decompose limestone in advance, improves
The resolution ratio of limestone, reduces kiln tail smoke-box noxConcentration, improves yield, and reducing energy consumption.Preheater 1 only preheating lime stone,
Preheater 1 not skinning completely, still can reach pre-heat effect without the need for so big volume, so also may be selected to reduce
Preheater size, carries out inside holding, reduces surface radiating, reduces heat consumption further.
Wherein, the scope of n preferably 3～8 in said method.
Because calcareous raw material of the present invention and auxiliary material separate grinding and separate feeding, therefore, the present invention can root
The fineness of grinding is selected flexibly to be adjusted according to the different characteristic of raw material, for siliceous raw material, the low grinding journey of crystallization degree
Degree can be partially thicker, and the high grinding degree of crystallization degree can be partially thin, reduces the power consumption of raw material grinding.Wherein, this
In bright method, when the siliceous raw material contents of free si in raw material is more than 65%, the grinding fineness of siliceous raw material was 0.08mm
The screen over-size of sieve is less than 12%.
In present invention process, limestone fully decomposes, and only has solid state reaction in kiln, and institute's calorific requirement reduces in a large number, so
Can reduce total consumption of coal, reducing energy consumption, simultaneously head coal amount reduce, in existing process head coal (rotary kiln end coal) consumption and
The ratio of tail coal (dore furnace coal) consumption is 35～40 weight portion 60～65 weight portion, and the inventive method dore furnace decomposes
In the operation of rotary kiln solid state reaction, the ratio of head coal consumption and tail coal consumption is 20～25 weight portion 75～80 weight portion.
In sum, those skilled in the art will envision that, the present invention adopt above-mentioned calcareous raw material and auxiliary
Raw material separates grinding and separates the mode of feeding, can improve yield and clinker quality with reducing energy consumption, calciner temperature also may be used
Being adjusted flexibly, thus adapting to different material feature, it is to avoid preheater skinning, reducing head coal and total coal consumption, reduce energy further
Consumption.The inventive method is suitable to promote the use in the art.
Claims (3)
1. cement clinker calcining method, using predecomposition dry-process cement rotary kiln technique, including raw material grinding operation, pre-heating system preheating
Operation, dore furnace decomposition process, rotary kiln solid state reaction operation, described pre-heating system includes n level preheating procedure, and its feature exists
In: during raw material grinding, calcareous raw material and auxiliary material are separated grinding and separate feeding, calcareous raw material feeding preheating system
System is preheated, and enters dore furnace and decomposes, subsequently into n-th grade of preheating procedure of pre-heating system, after the preheating of n-1 level
Enter rotary kiln eventually and carry out solid state reaction；Auxiliary material is fed directly into n-th grade of preheating procedure or the rotary kiln of pre-heating system,
Finally carry out solid state reaction together with calcareous raw material；Dore furnace decomposes in the operation with rotary kiln solid state reaction, head coal consumption
Ratio with tail coal consumption is 20～25 weight portion 75～80 weight portion.
2. cement clinker calcining method according to claim 1 it is characterised in that: the scope of n is 3～8.
3. cement clinker calcining method according to claim 1 it is characterised in that: when the siliceous raw material free silica in raw material
When content is more than 65%, the grinding fineness of siliceous raw material was the screen over-size of 0.08mm sieve less than 12%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410162763.6A CN104773967B (en) | 2014-04-22 | 2014-04-22 | Cement clinker calcining method |
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| CN201410162763.6A CN104773967B (en) | 2014-04-22 | 2014-04-22 | Cement clinker calcining method |
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| CN104773967B true CN104773967B (en) | 2017-02-01 |
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| CN105585263B (en) * | 2015-12-23 | 2018-01-16 | 中国建筑材料科学研究总院 | The preparation method of clinker |
| CN106277872B (en) * | 2016-08-12 | 2018-07-20 | 华润水泥技术研发有限公司 | Application of the iron cement containing calorific value in producing clinker |
| CN112654590B (en) * | 2019-08-12 | 2022-07-01 | 天津水泥工业设计研究院有限公司 | Cement kiln system capable of adjusting CO2 enrichment amount and improved by online decomposing furnace and using method thereof |
| CN117105547A (en) * | 2023-07-28 | 2023-11-24 | 天津中材工程研究中心有限公司 | A system and method for feeding coal gangue alone to calcine cement clinker |
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| CN1554609A (en) * | 2003-12-26 | 2004-12-15 | 昆明理工大学 | Cement clinker calcining cycle pre-calcination process and device |
| CN202511622U (en) * | 2012-02-16 | 2012-10-31 | 合肥水泥研究设计院 | Device using carbide slag to manufacture cement |
| CN103588399A (en) * | 2013-11-19 | 2014-02-19 | 南京工业大学 | Cement predecomposition kiln |
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