CN104457217B - A kind of microwave kiln of auxiliary calcination of cement clinker - Google Patents
A kind of microwave kiln of auxiliary calcination of cement clinker Download PDFInfo
- Publication number
- CN104457217B CN104457217B CN201410634697.8A CN201410634697A CN104457217B CN 104457217 B CN104457217 B CN 104457217B CN 201410634697 A CN201410634697 A CN 201410634697A CN 104457217 B CN104457217 B CN 104457217B
- Authority
- CN
- China
- Prior art keywords
- microwave
- kiln
- controlled
- kiln hood
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Furnace Details (AREA)
Abstract
The present invention discloses a kind of microwave kiln of auxiliary calcination of cement clinker, comprises that bottom is provided with the kiln of blower fan, also comprises rotation kiln hood, driving mechanism, fixing kiln hood, distributing device, microwave generator and waveguide; Described rotation kiln hood is arranged on the fire door of kiln. Microwave field radiation of the present invention is even, the present invention is by arranging rotation kiln hood, waveguide and microwave generator are arranged on to rotation together on rotation kiln hood, the microwave field of the transmitting of microwave generator is in the process of rotation, in kiln, form gradually a uniform microwave field of the wide microwave of area coverage, and the present invention is provided with the annular trolley of power supply and driving mechanism, and the rotating speed of rotation kiln hood can be regulated by driving mechanism, thereby microwave field can be regulated.
Description
Technical field
The present invention relates to a kind of burning clinker of cement Apparatus and method for, a kind of auxiliary calcining cement is ripe specificallyMicrowave kiln and the microwave calcination method thereof of material.
Background technology
Since cement invention, the calcining of its grog is used coal or minority to use natural gas as thermal source always,The mode that adds thermal material is taking conduction, convection current as main, and radiation is auxiliary, the be heated heat of an ecto-entad of materialTransmittance process, forms larger thermograde, causes chemical reaction velocity inconsistent, affects carrying of clinker qualityHigh; The programming rate of the conduction of the burning by medium material is slow in addition, is generally 10-20 DEG C/min, and grog is forgedThe burning time is long, and the thermal efficiency is low; Simultaneously because the wall effect of material particles size, furnace equipment itself etc. causes disconnectedFace ventilates inhomogeneous, also affects the raising of clinker quality.
Burning of coal process be in addition also along with temperature raise from drying and preheating, fugitive constituent overflow burning, to fixingThe process of carbon burning, coefficient of excess air is high, and burning of coal speed is fast, but because the heat loss that ventilation is taken away is large;Coefficient of excess air is low, improper ventilation, and chemically incomplete combustion phenomenon is outstanding, and thermal waste, can not reachEach stage is calcined needed temperature requirement.
In actual production process, because the demand of forming heat of clinker amount, the coal amount that contains in raw material is generally 10%Left and right, the physical condition that coefficient of excess air is high is not easy to possess, and the inner amount of oxygen of pellet is few, and chemistry is notCompleting combustion phenomenon necessarily exists, and the programming rate of material generally can only reach 10-20m/min, has restricted ripeChemical reaction velocity and reaction mass that material forms, and then limited clinker quality.
Therefore people have set up microwave generator and have assisted calcining cement on some microwave equipments, as application number isThe patent of 00102065X is set up microwave launcher tube by the high temperature band portion at rotary kiln, by microwave field to heightRadiation is carried out in temperate zone, to improve the quality of calcining cement; But a lot of equipment with microwave emitter is with above-mentionedPatent is the same, and microwave field cannot be realized and being uniformly distributed for the radiation of kiln, the irradiation area of microwave field to kilnBe all changeless, cannot really increase temperature and the quality of calcining, still can cause the burning of clinkerWith the generation of the situations such as raw burn, and microwave field is single that kiln high temperature band is irradiated, and for preheating decomposition zoneAll do not carry out microwave irradiation with solid phase reaction band, can not ensure equally the steady quality of clinker.
Summary of the invention
The object of the invention is the deficiency existing for prior art, the micro-of a kind of auxiliary calcination of cement clinker is providedRipple kiln and microwave calcination method thereof.
Technical scheme: the present invention's adopted technical scheme of dealing with problems is: a kind of auxiliary calcination of cement clinkerMicrowave kiln, comprises that bottom is provided with the kiln of blower fan, also comprise rotation kiln hood, driving mechanism, fixing kiln hood,Distributing device, microwave generator and waveguide; Described rotation kiln hood is arranged on the fire door of kiln, described driving mechanismBe connected with rotation kiln hood and rotate kiln hood rotation for driving; Described fixing kiln hood is arranged on rotation kiln hood; InstituteState distributing device and be arranged in fixing kiln hood, described waveguide is arranged on and on microwave generator, connects as one formula knotStructure, described microwave generator is arranged on rotation kiln hood and rotates with rotation kiln hood, and described waveguide is tilted to downBe inserted in rotation kiln hood.
As preferably, described driving mechanism comprises drive motors, sprocket wheel, loop chain, gear wheel and road wheel; DescribedDrive motors is fixedly installed, and sprocket wheel is arranged on the output shaft of drive motors, and the bottom of described rotation kiln hood arrangesHave annular channel-section steel, described loop chain is arranged in cannelure, and described ring chain and sprocket is meshed, described gear wheel peaceBe contained in annular channel-section steel inner side, described road wheel is arranged on the base plate of rotation kiln hood; By each portion of driving mechanismThe cooperation of part makes to rotate kiln hood and is rotated, and can regulate rotary speed to make it at 0.5～3.0m/minIn scope.
As preferably, also comprise the power supply annular trolley for microwave generator power supply is provided; Described supply ringsShape trolley is arranged at the top of rotation kiln hood ringwise, and is connected with microwave generator by cable; Due to micro-Wave producer rotates together with rotation kiln hood, and therefore the power supply unit of microwave generator is set to power annular slidingTouch line, to meet the power reguirements of microwave generator.
As preferably, for the radiation that makes microwave field is evenly and in order to reach the radiation degree of depth of microwave field, described rippleThe integral structure that conduit and microwave generator are formed by connecting is provided with three altogether, and is circumference equal dividing state and is arranged onOn rotation kiln hood.
As preferably, the angle of inclination of described waveguide is 30-60 °; Coordinate the frequency of microwave source can make micro-The penetration depth of wave field is more than or equal to 1.5m, and therefore the angle of inclination of waveguide is set to 30-60 °, makes itCan act on successively preheating decomposition zone, solid phase reaction band and clinkering zone.
As preferably, in order to make cement after calcining can be fast cooling and get rid of unnecessary waste gas, described rotationIn kiln hood, be also provided with exhaust duct; Described exhaust duct reaches the outside of fixing kiln hood.
The calcination process of clinker in kiln is that a calcium, iron, silicon, aluminium are the chemistry of main multielementReaction, rising to 900 DEG C from normal temperature is decomposition reaction stage, from 900～1250 DEG C be the solid phase reaction stage, andBe liquid reaction phase at 1250～1450～1250 DEG C, being down to normal temperature from 1250 DEG C is the cooling stage of reaction.
In decomposition reaction stage, clay pledge material decomposes becomes Al2O3、SiO2, decomposition of limestone becomes CaO,Temperature reaches 900 DEG C and produces solid phase reactions, the component after lime stone and clay matter are decomposed, by particle mutuallyDiffusion, forms C3A,C4AF,C2The mineral such as S, are first intergranular some face contacts, follow and pass through by reactantProduct layer is carried out diffusive migration, owing to thering is very large active force between solid proton, thereby the reaction of solid phase reactionActivity is very low, and speed is very slow, and temperature continues to be elevated to lowest total of the melting point temperature, approximately has 1250 DEG C of left and right, liquidThere is mutually C2S and f-CaO are fused in liquid phase, C2S continues to absorb the end product C of CaO formation grog3S，Finally complete clinkersintering process; And along with the exhausting of coal heat, grog enters cooling stage, from bottom to topCold wind and grog exchange heat energy, cooling grog, meanwhile, hot blast continues upwards to arrive clinkering zone, and coal combustion is providedRequired oxygen; The mineral that clinkering zone forms also can produce phase transformation when cooling, affects clinker quality, therefore calcineShi Yaoqiu is cooling fast crosses 1250 DEG C to stop phase transformation, ensures that clinker quality is stable.
The present invention also provides a kind of microwave calcination method of microwave kiln of auxiliary calcination of cement clinker, comprises following stepRapid:
(1) prepare water content 4-8%, the raw material ball that is 5-8mm containing coal amount 5-7%, diameter, and adjust materialThe microcosmic fineness of powder is at 40-100 μ m; The frequency of adjusting microwave generator launched microwave source is 900-930Mhz,Make microwave source under raw material ball natural packing state, the penetration depth of microwave field effective power is more than or equal to 1.5m;
(2) raw material ball preparing is continuously added to microwave generator by the distributing device of kiln topThe microwave field producing is to its laser heating, makes the temperature rise to 190 DEG C-210 DEG C of this bed of material, now raw material ballIn water first evaporate, the heating-up time is controlled at 6.5-8.5min, heating rate is controlled at 21～27 DEG C/min,This section of thickness of feed layer is controlled at 0.15-0.2m, and in temperature-rise period, the water in raw material ball evaporates;
(3) completing steps 2, after material continues to move down, the bed of material in microwave field penetration step 2 continues heatingPellet, the simultaneously common heating of volatile ingredient effusion burning pellet, the now silicon in pellet, the aluminium matter of coal in pelletMaterial molecular water dewaters and resolves into amorphous alumina and silica, makes this material layer temperature rise to 540 DEG C-560 DEG C, its heating-up time is controlled at 9-13min, and heating rate is controlled at 27～40 DEG C/min, this section of bed of materialTHICKNESS CONTROL is at 0.2-0.3m;
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that takes fire in pellet, and calcareous material part in pelletResolve into calcium oxide and and step 3 in the amorphous silicon oxide and the aluminium oxide generation chemical reaction that produce, make thisMaterial layer temperature rises to 890 DEG C-910 DEG C; Its heating-up time is controlled at 9-13min, and heating rate is controlled at 27～40 DEG C/min, this section of thickness of feed layer is controlled at 0.2-0.3m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that fully burns in pellet, and calcareous material in pellet is wholeResolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this materialLayer temperature rise to 1100 DEG C-1300 DEG C; Heating-up time is controlled at 10-15min, and heating rate is controlled at 20～30 DEG C/min, this section of thickness of feed layer is controlled at 0.3-0.4m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continuesContinuous heating pellet, now microwave field makes to produce dipole between material molecule and turns to polarization, between material molecule, producesPhase mutual friction, makes material liquefaction for C2S, in pellet, the fixed carbon of coal fully burns and chemical heat release simultaneouslyActing in conjunction, makes this material layer temperature rise to 1400-1450 DEG C; And the C generating2S liquid absorption calcium oxideGenerate final products C3S; The heating-up time of this section of bed of material is controlled at 25-30min, and heating rate is controlled at 6.5～8 DEG C/min, THICKNESS CONTROL is at 0.4-0.5m;
(7) after completing steps 6, material continues to move down, and departs from microwave field active region, the coal after-flame in pellet,It is cooling that the blower fan of control kiln bottom carries out air blast, obtains final finished; Obtain final material thickness 8-8.5m,Temperature is down to 100-60 DEG C from 1400-1450 DEG C, and temperature fall time is controlled at 3-4h, and rate of temperature fall is controlled at 6～8℃/min。
Beneficial effect: the present invention with respect to the microwave calcination equipment of existing clinker and method for calcinating have withLower advantage:
(1) microwave field radiation of the present invention is even, and the present invention is by rotation kiln hood is set, by waveguide and micro-Wave producer is arranged on rotation together on rotation kiln hood, and the microwave field of the transmitting of microwave generator is in the process of rotationIn, in kiln, form gradually a uniform microwave field of the wide microwave of area coverage, and setting of the present inventionPower supply annular trolley and driving mechanism, and can regulate the rotating speed of rotation kiln hood by driving mechanism, therebyCan regulate microwave field;
(2) microwave field of the present invention acts on the whole process of burning clinker of cement, and the present invention passes through waveguidePipe is arranged on rotation kiln hood with the inclination angle of 30-60 °, and the microwave frequency of adjusting microwave generator makes microwavePenetration depth is more than or equal to 1.5m, and then acts on the calcination process of whole clinker, and the present invention establishesPut the load that road wheel can alleviate microwave generator.
(3) clinker burning method of the present invention is with respect to prior art, by the uniform microwave field of radiation is setAnd act on whole calcination process, and make the time of its calcining short, calcining programming rate is fast, can really reach anxiousBurn the requirement of rapid cooling, increase chemical reaction velocity and calcination efficiency in grog, improve clinker quality.
Brief description of the drawings
Fig. 1 structural representation of the present invention;
Fig. 2 is the X-ray diffractogram of the clinker after the present invention's calcining;
Fig. 3 is full coal calcination clinker petrographic map;
Fig. 4 is the auxiliary calcination of cement clinker petrographic map of microwave;
Fig. 5 is driving mechanism structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, the present embodiment is with the technology of the present inventionScheme is to implement under prerequisite, should understand these embodiment and only be not used in and limit this for the present invention is describedBright scope.
Embodiment 1
As shown in Figure 1, a kind of microwave kiln of auxiliary calcination of cement clinker, comprises bottom peace to microwave kiln of the present inventionThe kiln 1 of blower fan is housed, also comprises rotation kiln hood 2, driving mechanism 3, fixing kiln hood 4, distributing device 5, micro-Wave producer 6 and waveguide 7; Described rotation kiln hood 2 is arranged on the fire door of kiln 1, described driving mechanism 3With rotation kiln hood 2 be connected and for drive rotate kiln hood 2 rotate; Described fixing kiln hood 4 is arranged on rotation kiln hoodOn 2; Described distributing device 5 is arranged in fixing kiln hood 4, and described waveguide 7 is arranged on microwave generator 6Connect as one formula structure, described microwave generator 6 is arranged on rotation kiln hood 2 and rotates with rotation kiln hood 2,7, described waveguide is tilted to down and is inserted in rotation kiln hood 2; Described driving mechanism 3 comprises drive motors31, sprocket wheel 32, loop chain 33, gear wheel 34 and road wheel 35; Described drive motors 31 is fixedly installed, sprocket wheel32 are arranged on the output shaft of drive motors, and the bottom of described rotation kiln hood 2 is provided with annular channel-section steel, described inLoop chain 33 is arranged in cannelure, and described loop chain 33 is meshed with sprocket wheel 32, and described gear wheel 34 is arranged onAnnular channel-section steel inner side, described road wheel 35 is arranged on the base plate of rotation kiln hood 2; Also comprise for providing micro-The power supply annular trolley 8 of wave producer 6 power supplys; The annular trolley 8 of described power supply is arranged at rotation ringwiseThe top of kiln hood 2, and be connected with microwave generator 6 by cable; Described waveguide 7 and microwave generator 6The integral structure being formed by connecting is provided with three altogether, and be circumference equal dividing state be arranged on rotation kiln hood 2 on; InstituteThe angle of inclination of stating waveguide 7 is 30-60 °; 45 ° of optimized angles; The row of being provided with also in described rotation kiln hood 2Airduct 9; Described exhaust duct 9 reaches the outside of fixing kiln hood 4.
By utilizing the microwave calcination method of microwave kiln of the present invention as follows:
(1) prepare water content 4%, the raw material ball that is 5mm containing coal amount 5%, diameter, and adjust the micro-of material powderSee fineness at 40 μ m; The frequency of adjusting microwave generator launched microwave source is 900Mhz, makes microwave source at raw materialUnder ball natural packing state, the penetration depth of microwave field effective power is more than or equal to 1.5m;
(2) raw material ball preparing is continuously added to microwave generator by the distributing device of kiln topThe microwave field producing, to its laser heating, makes the temperature rise to 190 DEG C of this bed of material, now the water in raw material ballFirst evaporation, the heating-up time is controlled at 6.5min, and heating rate is controlled at 21 DEG C/min, this section of thickness of feed layerBe controlled at 0.15m, in temperature-rise period, the water in raw material ball evaporates;
(3) completing steps 2, after material continues to move down, the bed of material in microwave field penetration step 2 continues heatingPellet, the simultaneously common heating of volatile ingredient effusion burning pellet, the now silicon in pellet, the aluminium matter of coal in pelletMaterial molecular water dewaters and resolves into amorphous alumina and silica, makes this material layer temperature rise to 540 DEG C,Its heating-up time is controlled at 9min, and heating rate is controlled at 27 DEG C/min, and this section of thickness of feed layer is controlled at 0.2m;
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that takes fire in pellet, and calcareous material part in pelletResolve into calcium oxide and and step 3 in the amorphous silicon oxide and the aluminium oxide generation chemical reaction that produce, make thisMaterial layer temperature rises to 890 DEG C; Its heating-up time is controlled at 9min, and heating rate is controlled at 27 DEG C/min,This section of thickness of feed layer is controlled at 0.2m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that fully burns in pellet, and calcareous material in pellet is wholeResolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this materialLayer temperature rise to 1100 DEG C DEG C; Heating-up time is controlled at 10min, and heating rate is controlled at 20 DEG C/min, thisSection thickness of feed layer is controlled at 0.3m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continuesContinuous heating pellet, now microwave field makes to produce dipole between material molecule and turns to polarization, between material molecule, producesPhase mutual friction, makes material liquefaction for C2S, in pellet, the fixed carbon of coal fully burns and chemical heat release simultaneouslyActing in conjunction, makes this material layer temperature rise to 1400 DEG C; And the C generating2S liquid absorption calcium oxide generatesFinished product C3S; The heating-up time of this section of bed of material is controlled at 25min, and heating rate is controlled at 6.5 DEG C/min, thickDegree is controlled at 0.4m;
(7) after completing steps 6, material continues to move down, and departs from microwave field active region, the coal after-flame in pellet,It is cooling that the blower fan of control kiln bottom carries out air blast, obtains final finished; Obtain final material thickness 8m, temperatureDegree is down to 100 DEG C from 1400 DEG C, and temperature fall time is controlled at 3h, and rate of temperature fall is controlled at 6 DEG C/min.
Embodiment 2
(1) prepare water content 8%, the raw material ball that is 8mm containing coal amount 7%, diameter, and adjust the micro-of material powderSee fineness at 100 μ m; The frequency of adjusting microwave generator launched microwave source is 930Mhz, and microwave source is being given birth toUnder pellet natural packing state, the penetration depth of microwave field effective power is more than or equal to 1.5m;
(2) raw material ball preparing is continuously added to microwave generator by the distributing device of kiln topThe microwave field producing, to its laser heating, makes the temperature rise to 210 DEG C of this bed of material, now the water in raw material ballFirst evaporation, the heating-up time is controlled at 8.5min, and heating rate is controlled at 27 DEG C/min, this section of thickness of feed layerBe controlled at 0.2m, in temperature-rise period, the water in raw material ball evaporates;
(3) completing steps 2, after material continues to move down, the bed of material in microwave field penetration step 2 continues heatingPellet, the simultaneously common heating of volatile ingredient effusion burning pellet, the now silicon in pellet, the aluminium matter of coal in pelletMaterial molecular water dewaters and resolves into amorphous alumina and silica, makes this material layer temperature rise to 560 DEG C,Its heating-up time is controlled at 9-13min, and heating rate is controlled at 40 DEG C/min, and this section of thickness of feed layer is controlled at0.3m；
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that takes fire in pellet, and calcareous material part in pelletResolve into calcium oxide and and step 3 in the amorphous silicon oxide and the aluminium oxide generation chemical reaction that produce, make thisMaterial layer temperature rises to 910 DEG C; Its heating-up time is controlled at 13min, and heating rate is controlled at 40 DEG C/min,This section of thickness of feed layer is controlled at 0.3m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that fully burns in pellet, and calcareous material in pellet is wholeResolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this materialLayer temperature rise to 1300 DEG C; Heating-up time is controlled at 10-15min, and heating rate is controlled at 30 DEG C/min,This section of thickness of feed layer is controlled at 0.4m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continuesContinuous heating pellet, now microwave field makes to produce dipole between material molecule and turns to polarization, between material molecule, producesPhase mutual friction, makes material liquefaction for C2S, in pellet, the fixed carbon of coal fully burns and chemical heat release simultaneouslyActing in conjunction, makes this material layer temperature rise to 1450 DEG C; And the C generating2S liquid absorption calcium oxide generatesFinished product C3S; The heating-up time of this section of bed of material is controlled at 30min, and heating rate is controlled at 8 DEG C/min, thicknessBe controlled at 0.5m;
(7) after completing steps 6, material continues to move down, and departs from microwave field active region, the coal after-flame in pellet,It is cooling that the blower fan of control kiln bottom carries out air blast, obtains final finished; Obtain final material thickness 8.5m,Temperature is down to 60 DEG C from 1450 DEG C, and temperature fall time is controlled at 4h, and rate of temperature fall is controlled at 8 DEG C/min.
Embodiment 3
(1) prepare water content 6%, the raw material ball that is 6mm containing coal amount 6%, diameter, and adjust the micro-of material powderSee fineness at 40-100 μ m; The frequency of adjusting microwave generator launched microwave source is 915Mhz, and microwave source is existedUnder raw material ball natural packing state, the penetration depth of microwave field effective power is more than or equal to 1.5m;
(2) raw material ball preparing is continuously added to microwave generator by the distributing device of kiln topThe microwave field producing, to its laser heating, makes the temperature rise to 200 DEG C of this bed of material, now the water in raw material ballFirst evaporation, the heating-up time is controlled at 7.5min, and heating rate is controlled at 24 DEG C/min, this section of thickness of feed layerBe controlled at 0.2m, in temperature-rise period, the water in raw material ball evaporates;
(3) completing steps 2, after material continues to move down, the bed of material in microwave field penetration step 2 continues heatingPellet, the simultaneously common heating of volatile ingredient effusion burning pellet, the now silicon in pellet, the aluminium matter of coal in pelletMaterial molecular water dewaters and resolves into amorphous alumina and silica, makes this material layer temperature rise to 550 DEG C,Its heating-up time is controlled at 11min, and heating rate is controlled at 33 DEG C/min, and this section of thickness of feed layer is controlled at0.2-0.3m；
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that takes fire in pellet, and calcareous material part in pelletResolve into calcium oxide and and step 3 in the amorphous silicon oxide and the aluminium oxide generation chemical reaction that produce, make thisMaterial layer temperature rises to 900 DEG C; Its heating-up time is controlled at 11min, and heating rate is controlled at 33 DEG C/min,This section of thickness of feed layer is controlled at 0.15m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that fully burns in pellet, and calcareous material in pellet is wholeResolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this materialLayer temperature rise to 1200 DEG C; Heating-up time is controlled at 13min, and heating rate is controlled at 25 DEG C/min, this sectionThickness of feed layer is controlled at 0.35m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continuesContinuous heating pellet, now microwave field makes to produce dipole between material molecule and turns to polarization, between material molecule, producesPhase mutual friction, makes material liquefaction for C2S, in pellet, the fixed carbon of coal fully burns and chemical heat release simultaneouslyActing in conjunction, makes this material layer temperature rise to 1425 DEG C; And the C generating2S liquid absorption calcium oxide generatesFinished product C3S; The heating-up time of this section of bed of material is controlled at 28min, and heating rate is controlled at 7 DEG C/min, thicknessBe controlled at 0.45m;
(7) after completing steps 6, material continues to move down, and departs from microwave field active region, the coal after-flame in pellet,It is cooling that the blower fan of control kiln bottom carries out air blast, obtains final finished; Obtain final material thickness 8m, temperatureDegree is down to 80 DEG C from 1425 DEG C, and temperature fall time is controlled at 3.5h, 7 DEG C/min of rate of temperature fall control.
The cement of the clinker in the present embodiment after microwave calcination and full coal combustion in same kilnThe test data contrast of grog is as follows:
Table 1 clinker strength and f-CaO data
| 3d compression strength (Mpa) | 28d compression strength (Mpa) | f-CaO | |
| Microwave is assisted calcination of chamotte | 43.8 | 71.4 | 1.38 |
| Full coal calcination grog | 29.4 | 53.5 | 2.40 |
As shown in Figure 2, and by X-ray diffraction analysis, C in the auxiliary calcination of chamotte of microwave3S content obviously increasesAdd, its characteristic peaks reaches 266CPS, and the grog of common full coal calcination, C3S levies peak value and reaches 185CPS;And microwave is assisted calcination of chamotte C3S crystal grain is obviously less, and the width that its performance is diffraction peak shape is in the drawings narrower.
And test the pattern of microwave calcination grog and the ore deposit phase of full coal calcination grog and contain by reflection macroscope macroscopeAmount, is shown in shown in Fig. 3 and Fig. 4, and the auxiliary calcination of chamotte alite crystalline size major part of microwave is at 10-25 μ mBetween, there is B ore deposit wrappage in part larger-size A ore deposit, and belite ore deposit size, between 30-35 μ m, isRound shaped grain shape, centre is evenly distributed mutually, and aluminium mineral material size is less than 15 μ m, is column, and it is long that ferrous aluminate isColumn crystal, silicate mineral accounts for 75%, middle phase mineral content 10-25%.
And full coal calcination grog alite crystalline size major part is between 20-25 μ m, lack part size40-50 μ m, is shaped as column or irregular tabular, and belite ore deposit size, between 20-35 μ m, is great circleGranular, phase (C in the middle of black4AF) be distributed in the middle phase (C of white with crystallite3A) inner, in the middle of white, be mutually long column shapeCrystal, silicate mineral accounts for 65%, middle phase mineral content 20-30%.
Show by above-mentioned industry calcining result of the test, the auxiliary calcination of cement clinker intensity of microwave improves 20-30%,And have more rational crystal structure and crystalline size, so the method has actual popularization meaning in industrial productionJustice.
Claims (7)
1. a microwave kiln for auxiliary calcination of cement clinker, comprises that bottom is provided with the kiln (1) of blower fan, itsBe characterised in that: also comprise rotation kiln hood (2), driving mechanism (3), fixing kiln hood (4), distributing device (5),Microwave generator (6) and waveguide (7); Described rotation kiln hood (2) is arranged on the fire door of kiln (1),Described driving mechanism (3) is connected with rotation kiln hood (2) and rotates kiln hood (2) rotation for driving; DescribedFixing kiln hood (4) is arranged on rotation kiln hood (2); Described distributing device (5) is arranged on fixing kiln hood (4)In, described waveguide (7) is arranged on microwave generator (6) and connects as one formula structure, and described microwave is sent outIt is upper with rotation kiln hood (2) rotation that raw device (6) is arranged on rotation kiln hood (2), and described waveguide (7) inclinesUnder oblique, be inserted in rotation kiln hood (2).
2. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, is characterized in that:Described driving mechanism (3) comprise drive motors (31), sprocket wheel (32), loop chain (33), gear wheel (34) andRoad wheel (35); Described drive motors (31) is fixedly installed, and sprocket wheel (32) is arranged on the defeated of drive motorsOn shaft, the bottom of described rotation kiln hood (2) is provided with annular channel-section steel, and described loop chain (33) is arranged on ringIn shape groove, and described loop chain (33) is meshed with sprocket wheel (32), and described gear wheel (34) is arranged on cannelureSteel inner side, described road wheel (35) is arranged on the base plate of rotation kiln hood (2).
3. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, is characterized in that:Also comprise the power supply annular trolley (8) for microwave generator (6) power supply is provided; Described power supply annular is slidingTouch line (8) and be arranged at ringwise the top that rotates kiln hood (2), and by cable and microwave generator (6)Be connected.
4. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, is characterized in that:Described waveguide (7) is provided with three altogether with the integral structure that microwave generator (6) is formed by connecting, and is roundDivide a state to be arranged on rotation kiln hood (2) in week etc.
5. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, is characterized in that:The angle of inclination of described waveguide (7) is 30-60 °.
6. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, is characterized in that:In described rotation kiln hood (2), be also provided with exhaust duct (9); Described exhaust duct (9) reaches fixing kiln hood (4)Outside.
7. a kind of microwave calcination method of microwave kiln of auxiliary calcination of cement clinker according to claim 1,It is characterized in that: comprise the following steps:
(1) prepare water content 4-8%, the raw material ball that is 5-8mm containing coal amount 5-7%, diameter, and adjust materialThe microcosmic fineness of powder is at 40-100 μ m; The frequency of adjusting microwave generator launched microwave source is 900-930Mhz,Make microwave source under raw material ball natural packing state, the penetration depth of microwave field effective power is more than or equal to 1.5m;
(2) raw material ball preparing is continuously added to microwave generator by the distributing device of kiln topThe microwave field producing is to its laser heating, makes the temperature rise to 190 DEG C-210 DEG C of this bed of material, now raw material ballIn water first evaporate, the heating-up time is controlled at 6.5-8.5min, heating rate is controlled at 21～27 DEG C/min,This section of thickness of feed layer is controlled at 0.15-0.2m, and in temperature-rise period, the water in raw material ball evaporates;
(3) completing steps 2, after material continues to move down, the bed of material in microwave field penetration step 2 continues heatingPellet, the simultaneously common heating of volatile ingredient effusion burning pellet, the now silicon in pellet, the aluminium matter of coal in pelletMaterial molecular water dewaters and resolves into amorphous alumina and silica, makes this material layer temperature rise to 540 DEG C-560 DEG C, its heating-up time is controlled at 9-13min, and heating rate is controlled at 27～40 DEG C/min, this section of bed of materialTHICKNESS CONTROL is at 0.2-0.3m;
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that takes fire in pellet, and calcareous material part in pelletResolve into calcium oxide and and step 3 in the amorphous silicon oxide and the aluminium oxide generation chemical reaction that produce, make thisMaterial layer temperature rises to 890 DEG C-910 DEG C; Its heating-up time is controlled at 9-13min, and heating rate is controlled at 27～40 DEG C/min, this section of thickness of feed layer is controlled at 0.2-0.3m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heatingPellet, the simultaneously fixed carbon of the coal common heating pellet that fully burns in pellet, and calcareous material in pellet is wholeResolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this materialLayer temperature rise to 1100 DEG C-1300 DEG C; Heating-up time is controlled at 10-15min, and heating rate is controlled at 20～30 DEG C/min, this section of thickness of feed layer is controlled at 0.3-0.4m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continuesContinuous heating pellet, now microwave field makes to produce dipole between material molecule and turns to polarization, between material molecule, producesPhase mutual friction, makes material liquefaction for C2S, in pellet, the fixed carbon of coal fully burns and chemical heat release simultaneouslyActing in conjunction, makes this material layer temperature rise to 1400-1450 DEG C; And the C generating2S liquid absorption calcium oxideGenerate final products C3S; The heating-up time of this section of bed of material is controlled at 25-30min, and heating rate is controlled at 6.5～8 DEG C/min, THICKNESS CONTROL is at 0.4-0.5m;
(7) after completing steps 6, material continues to move down, and departs from microwave field active region, the coal after-flame in pellet,It is cooling that the blower fan of control kiln bottom carries out air blast, obtains final finished; Obtain final material thickness 8-8.5m,Temperature is down to 100-60 DEG C from 1400-1450 DEG C, and temperature fall time is controlled at 3-4h, and rate of temperature fall is controlled at 6～8℃/min。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634697.8A CN104457217B (en) | 2014-11-12 | 2014-11-12 | A kind of microwave kiln of auxiliary calcination of cement clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634697.8A CN104457217B (en) | 2014-11-12 | 2014-11-12 | A kind of microwave kiln of auxiliary calcination of cement clinker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104457217A CN104457217A (en) | 2015-03-25 |
| CN104457217B true CN104457217B (en) | 2016-05-18 |
Family
ID=52903668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410634697.8A Active CN104457217B (en) | 2014-11-12 | 2014-11-12 | A kind of microwave kiln of auxiliary calcination of cement clinker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104457217B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944812B (en) * | 2015-07-01 | 2018-07-10 | 嘉华特种水泥股份有限公司 | A kind of cement clinker mineral crystal and preparation method thereof |
| CN104944811B (en) * | 2015-07-01 | 2017-12-26 | 嘉华特种水泥股份有限公司 | A kind of preparation method of cement clinker mineral structure |
| CN106277873B (en) * | 2016-08-17 | 2018-11-13 | 南京戈德水泥技术工程有限责任公司 | A kind of microwave production cement method with exhaust gas generating function |
| CN114111325A (en) * | 2021-11-18 | 2022-03-01 | 株洲聚润合微波工业炉有限公司 | Method for arranging microwave emitters on outer peripheral surface of rotary kiln body |
| CN114249551A (en) * | 2021-11-23 | 2022-03-29 | 天津水泥工业设计研究院有限公司 | Method and system for calcining cement clinker by microwave and electric energy |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01167580A (en) * | 1987-12-22 | 1989-07-03 | Toshiba Corp | Microwave heating treating device |
| CN2044924U (en) * | 1989-03-11 | 1989-09-27 | 宜兴市冷作机械厂 | Magic-hand for operation on kiln crown of cement shaft kiln |
| CN1310146A (en) * | 2000-02-25 | 2001-08-29 | 谢艾民 | Microwave assistant cement sintering technology |
| CN201392089Y (en) * | 2009-01-15 | 2010-01-27 | 周苏明 | Mechanical upright kiln for refining vanadium by sodium roasting |
| CN102427630B (en) * | 2011-12-02 | 2013-08-14 | 湖南阳东微波科技有限公司 | High-temperature industrial furnace |
| CN103851899A (en) * | 2012-12-06 | 2014-06-11 | 李行雷 | Novel microwave rotary kiln |
| CN203810900U (en) * | 2014-04-08 | 2014-09-03 | 王彦龙 | Rotary-type industrial microwave oven |
| CN204478800U (en) * | 2014-11-12 | 2015-07-15 | 张雪华 | A kind of microwave kiln of auxiliary calcination of cement clinker |
-
2014
- 2014-11-12 CN CN201410634697.8A patent/CN104457217B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104457217A (en) | 2015-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104457217B (en) | A kind of microwave kiln of auxiliary calcination of cement clinker | |
| US20210078869A1 (en) | Method for preparing calcium oxide using a multistage suspension preheater kiln | |
| CN103387347B (en) | Method and device for producing active lime powder from calcined limestone | |
| CN101195520A (en) | Vertical continuous calcination lime burner | |
| CN101987783A (en) | Method for producing active pulverized lime by utilizing coal gas to calcine limestone through suspended state pre-heating decomposing furnace | |
| CN103822464A (en) | Industrial continuous high-temperature microwave calcining furnace for mineral granules and powder | |
| CN109336432B (en) | Cement clinker preparation method and device | |
| CN102603216A (en) | Active lime calcining system with precalciner and active lime calcining method | |
| CN103708515A (en) | Method for producing alpha-Al2O3 by employing predecomposition technology and taking aluminium hydrogen as raw material | |
| CN103496702A (en) | Production device for coproduction of calcium carbide by electrothermal method and oxygen thermal method | |
| CN102020250A (en) | New method for producing sulphuric acid and generation joint product cement by decomposing phosphogypsum through microwave reduction | |
| WO2012131821A1 (en) | Manufacturing facility for quicklime, and manufacturing facility and manufacturing process for slaked lime | |
| CN204478800U (en) | A kind of microwave kiln of auxiliary calcination of cement clinker | |
| CN201686500U (en) | Microwave rotary kiln used for calcining chemical uranium concentrate | |
| CN107311476A (en) | A kind of method of pure coke-stove gas active lime calcination | |
| CN203478938U (en) | Rotary kiln apparatus with energy recovery equipment | |
| CN207006824U (en) | A kind of dynamic calcining equipment of powder body material | |
| CN101607791B (en) | Process approach for preparing quick lime by heating carbon source and calcining limestone with microwave | |
| CN104446494A (en) | Method for producing beta-silicon carbide by adopting internal-combustion rotary furnace | |
| CN100368297C (en) | Device for preparing aluminum oxide self-efflorescence grog by fusion method and preparation method thereof | |
| CN202347064U (en) | Shaft furnace type oxidization and sodium treatment roasting device | |
| CN102351442A (en) | Method for material calcination and limekiln device | |
| CN101830709A (en) | Process method for roasting vanadium pentoxide | |
| CN217202540U (en) | Equipment for producing lime by using alternative fuel | |
| CN106277873A (en) | A kind of microwave with waste gas generating function produces cement new method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |