CN104457217A - Microwave kiln for assisting in cement clinker calcination and microwave calcination method thereof - Google Patents
Microwave kiln for assisting in cement clinker calcination and microwave calcination method thereof Download PDFInfo
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- CN104457217A CN104457217A CN201410634697.8A CN201410634697A CN104457217A CN 104457217 A CN104457217 A CN 104457217A CN 201410634697 A CN201410634697 A CN 201410634697A CN 104457217 A CN104457217 A CN 104457217A
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Abstract
The invention discloses a microwave kiln for assisting in cement clinker calcination. The microwave kiln for assisting in cement clinker calcination comprises a kiln body and further comprises a rotary kiln cover, a driving mechanism, a fixed kiln cover, a distributing device, a microwave generator and a waveguide tube, wherein a draught fan is installed on the bottom of the kiln body, and the rotary kiln cover is installed on the kiln mouth of the kiln body. According to the microwave kiln for assisting in cement clinker calcination, microwave field radiation is even; the rotary kiln cover is arranged, the waveguide tube and the microwave generator are installed on the rotary kiln cover and rotate along with the rotary kiln cover, and a microwave field which is large in coverage area and even in microwave radiation is formed gradually in the kiln body by microwaves emitted by the microwave generator during rotation; in addition, an annular power supply slide wire and the driving mechanism are arranged, the rotating speed of the rotary kiln cover can be adjusted through the driving mechanism, and thus the microwave field can be adjusted.
Description
Technical field
The present invention relates to a kind of burning clinker of cement Apparatus and method for, specifically a kind of microwave kiln of auxiliary calcination of cement clinker and microwave calcination method thereof.
Background technology
Since cement invention, the calcining of its grog uses coal or minority to use natural gas as thermal source always, the mode of heated material is based on conduction, convection current, radiation is auxiliary, material is heated the heat transfer process of an ecto-entad, form larger thermograde, cause chemical reaction velocity inconsistent, affect the raising of clinker quality; Programming rate additionally by the burning conduction material of medium is slow, and be generally 10-20 DEG C/min, the clinker burning time is long, and the thermal efficiency is low; Simultaneously because the wall effect etc. of material particles size, furnace equipment itself causes section ventilation uneven, also affect the raising of clinker quality.
Burning of coal process in addition is also that coefficient of excess air is high, and burning of coal speed is fast along with temperature raises from drying and preheating, fugitive constituent effusion burning, process to fixed carbon burning, but because the heat loss taken away of ventilating is large; Coefficient of excess air is low, improper ventilation, and chemically incomplete combustion phenomenon is given prominence to, thermal waste, can not reach the temperature requirement required for the calcining of each stage.
In actual production process, because the demand of grog firing system heat, the coal amount that contains in raw material is generally about 10%, the physical condition that coefficient of excess air is high is not easy to be possessed, and pellet internal oxygen amount is few, chemically incomplete combustion phenomenon necessarily exists, and the programming rate of material generally can only reach 10-20m/min, constrain chemical reaction velocity and the reaction mass of grog firing system, and then limit clinker quality.
Therefore people have set up microwave generator and have carried out auxiliary calcining cement on some microwave equipments, the patent being 00102065X as application number sets up microwave launcher tube by the high temperature band portion at rotary kiln, by microwave field, radiation is carried out to high temperature band, to improve the quality of calcining cement; But it is a lot of the same with above-mentioned patent with the equipment of microwave emitter, microwave field cannot realize being uniformly distributed for the radiation of kiln, microwave field is all changeless to the irradiation area of kiln, really cannot increase temperature and the quality of calcining, still can cause the generation of the situation such as burning and raw burn of clinker, and microwave field is single irradiates kiln high temperature band, and microwave irradiation is not all carried out for preheating decomposition zone and solid phase reaction band, the steady quality of clinker can not be ensured equally.
Summary of the invention
The object of the invention is the deficiency existed for prior art, a kind of microwave kiln and microwave calcination method thereof of auxiliary calcination of cement clinker are provided.
Technical scheme: the present invention's adopted technical scheme of dealing with problems is: a kind of microwave kiln of auxiliary calcination of cement clinker, comprise the kiln that bottom is provided with blower fan, also comprise and rotate 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, and described driving mechanism is connected with rotation kiln hood and rotates kiln hood rotate for driving; Described fixing kiln hood is arranged on and rotates on kiln hood; Described distributing device is arranged in fixing kiln hood, and described waveguide is arranged on microwave generator and connects as one formula structure, and described microwave generator is arranged on to rotate on kiln hood and rotates with rotation kiln hood, and described waveguide is then tilted to down to be inserted into and rotates in kiln hood.
As preferably, described driving mechanism comprises drive motors, sprocket wheel, loop chain, gear wheel and road wheel; Described drive motors is fixedly installed, sprocket wheel is arranged on the output shaft of drive motors, the bottom of described rotation kiln hood is provided with annular channel-section steel, described loop chain is arranged in cannelure, and described ring chain and sprocket is meshed, described gear wheel is arranged on inside annular channel-section steel, and described road wheel is arranged on the base plate of rotation kiln hood; By the cooperation of driving mechanism all parts, rotation kiln hood is rotated, and rotary speed can be regulated to make it within the scope of 0.5 ~ 3.0m/min.
As preferably, also comprise the power supply annular trolley for providing microwave generator power supply; The annular trolley of described power supply is arranged at the top rotating kiln hood ringwise, and is connected with microwave generator by cable; Because microwave generator rotates together with rotation kiln hood, therefore the power supply unit of microwave generator is set to annular trolley of powering, to meet the power reguirements of microwave generator.
As preferably, in order to make the radiation degree of depth of the radiation of microwave field evenly and in order to reach microwave field, the integral structure that described waveguide and microwave generator are formed by connecting is provided with three altogether, and circumferentially decile state is arranged on rotation kiln hood.
As preferably, the angle of inclination of described waveguide is 30-60 °; Coordinate the frequency of microwave source that the penetration depth of microwave field can be made to be more than or equal to 1.5m, therefore the angle of inclination of waveguide is set to 30-60 °, preheating decomposition zone, solid phase reaction band and clinkering zone can be acted on successively.
As preferably, cool fast to enable the cement after calcining and get rid of unnecessary waste gas, in described rotation kiln hood, being also provided with exhaust duct; Described exhaust duct reaches the outside of fixing kiln hood.
The chemical reaction that the calcination process of clinker in kiln is a calcium, iron, silicon, aluminium are main multielement, rising to 900 DEG C from normal temperature is decomposition reaction stage, it is the solid phase reaction stage from 900 ~ 1250 DEG C, and be 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 Al
2o
3, SiO
2, decomposition of limestone becomes CaO, and temperature reaches 900 DEG C and produces solid phase reactions, lime stone and clay matter decompose after component, by the phase counterdiffusion of particle, form C
3a,C
4aF, C
2the mineral such as S, first be intergranular some face contact, follow and carry out diffusive migration by reactant by product layer, owing to having very large active force between solid proton, thus the reactivity of solid phase reaction is very low, and speed is very slow, temperature continues to be elevated to lowest total of the melting point temperature, about have about 1250 DEG C, liquid phase occurs, C
2s and f-CaO is fused in liquid phase, C
2s continues to absorb the end product C that CaO forms grog
3s, finally completes clinkersintering process; And exhausting along with coal heat, grog enters cooling stage, and cold wind from bottom to top and grog exchange heat energy, cooling grog, and meanwhile, hot blast continues upwards to arrive clinkering zone, provides the oxygen needed for coal combustion; Also can produce phase transformation during the mineral cooling that clinkering zone is formed, affect clinker quality, therefore require during calcining that cooling crosses 1250 DEG C to stop phase transformation fast, ensure that clinker quality is stablized.
The present invention also provides a kind of microwave calcination method of microwave kiln of auxiliary calcination of cement clinker, comprises the following steps:
(1) preparing water content 4-8%, is the raw material ball of 5-8mm containing coal amount 5-7%, diameter, and the microcosmic fineness of adjustment material powder is at 40-100 μm; The frequency in adjustment microwave generator launched microwave source is 900-930Mhz, and 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) distributing device of the raw material ball prepared by kiln top is continuously added, the microwave field that microwave generator produces is to its laser heating, the temperature of this bed of material is made to rise to 190 DEG C-210 DEG C, first water now in raw material ball evaporate, heating-up time controls at 6.5-8.5min, and heating rate controls at 21 ~ 27 DEG C/min, and this section of thickness of feed layer controls at 0.15-0.2m, 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 heating pellet, in pellet, the volatile ingredient effusion burning of coal heats pellet jointly simultaneously, silicon now in pellet, aluminium pledge material molecular water dewater and resolve into amorphous alumina and silica, and make this material layer temperature rise to 540 DEG C-560 DEG C, its heating-up time controls at 9-13min, heating rate controls at 27 ~ 40 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, simultaneously in pellet, the fixed carbon of coal takes fire and jointly heats pellet, and the calcareous material part in pellet resolves into calcium oxide and and the amorphous silicon oxide produced in step 3 and aluminium oxide generation chemical reaction, make this material layer temperature rise to 890 DEG C-910 DEG C; Its heating-up time controls at 9-13min, and heating rate controls at 27 ~ 40 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, in pellet, the fixed carbon Thorough combustion of coal heats pellet jointly simultaneously, and the calcareous material in pellet all resolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this material layer temperature rise to 1100 DEG C-1300 DEG C; Heating-up time controls at 10-15min, and heating rate controls at 20 ~ 30 DEG C/min, and this section of thickness of feed layer controls 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 continues heating pellet, and now microwave field makes to produce dipole between material molecule and turns to polarization, produces phase mutual friction between material molecule, and material is liquefied as C
2s, the simultaneously fixed carbon Thorough combustion of coal and chemical heat release acting in conjunction in pellet, makes this material layer temperature rise to 1400-1450 DEG C; And the C generated
2s liquid absorption calcium oxide generates final products C
3s; The heating-up time of this section of bed of material controls at 25-30min, and heating rate controls at 6.5 ~ 8 DEG C/min, and 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, and the blower fan controlled bottom kiln carries out air blast cooling, 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 controls at 3-4h, and rate of temperature fall controls at 6 ~ 8 DEG C/min.
Beneficial effect: the present invention has the following advantages relative to the microwave calcination equipment of existing clinker and method for calcinating:
(1) 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 rotate on kiln hood and rotate together, the microwave field of the transmitting of microwave generator is in the process rotated, a uniform microwave field of the wide microwave of area coverage is formed gradually in kiln, and the present invention is provided with the annular trolley of power supply and driving mechanism, and the rotating speed rotating kiln hood can be regulated by driving mechanism, thus can microwave field be regulated;
(2) microwave field of the present invention acts on the whole process of burning clinker of cement, the present invention rotates on kiln hood by being arranged on the inclination angle of 30-60 ° by waveguide, and the microwave frequency adjusting microwave generator makes the penetration depth of microwave be more than or equal to 1.5m, and then act on the calcination process of whole clinker, and the present invention arranges the load that road wheel can alleviate microwave generator.
(3) clinker burning method of the present invention is relative to prior art, by arranging the uniform microwave field of radiation and acting on whole calcination process, the time making it calcine is short, calcining programming rate is fast, really can reach anxious requirement of burning rapid cooling, increase the chemical reaction velocity in grog and calcination efficiency, improve clinker quality.
Accompanying drawing explanation
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 the lithofacies photo of clinker after the present invention's calcining;
Fig. 4 is driving mechanism structure schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, the present embodiment is implemented under premised on technical solution of the present invention, should understand these embodiments and only be not used in for illustration of the present invention and limit the scope of the invention.
Embodiment 1
As shown in Figure 1, a kind of microwave kiln of auxiliary calcination of cement clinker, comprises the kiln 1 that bottom is provided with blower fan to microwave kiln of the present invention, also comprises and rotates 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, and described driving mechanism 3 is connected with rotation kiln hood 2 and rotates kiln hood 3 rotate for driving; Described fixing kiln hood 4 is arranged on and rotates on kiln hood 2; Described distributing device 5 is arranged in fixing kiln hood 4, described waveguide 7 is arranged on microwave generator 6 and connects as one formula structure, described microwave generator 6 is arranged on to rotate on kiln hood 3 and rotates with rotation kiln hood 3, and 3, described waveguide is tilted to down to be inserted into and rotates in kiln hood 2; Described driving mechanism 3 comprises drive motors 31, sprocket wheel 32, loop chain 33, gear wheel 34 and road wheel 35; Described drive motors 31 is fixedly installed, sprocket wheel 32 is arranged on the output shaft of drive motors, the bottom of described rotation kiln hood 2 is provided with annular channel-section steel, described loop chain 33 is arranged in cannelure, and described loop chain 33 is meshed with sprocket wheel 32, described gear wheel 34 is arranged on inside annular channel-section steel, and described road wheel 35 is arranged on the base plate of rotation kiln hood 2; Also comprise the power supply annular trolley 8 for providing microwave generator 6 power supply; The annular trolley 8 of described power supply is arranged at the top rotating kiln hood 2 ringwise, and is connected with microwave generator 6 by cable; The integral structure that described waveguide 7 and microwave generator 6 are formed by connecting is provided with three altogether, and circumferentially decile state is arranged on rotation kiln hood 3; The angle of inclination of described waveguide 7 is 30-60 °; Optimized angle 45 °; Exhaust duct 9 is also provided with in described rotation kiln hood 3; 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) preparing water content 4%, is the raw material ball of 5mm containing coal amount 5%, diameter, and the microcosmic fineness of adjustment material powder is at 40 μm; The frequency in adjustment microwave generator launched microwave source is 900Mhz, and 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) distributing device of the raw material ball prepared by kiln top is continuously added, the microwave field that microwave generator produces is to its laser heating, the temperature of this bed of material is made to rise to 190 DEG C, first water now in raw material ball evaporate, heating-up time controls at 6.5min, and heating rate controls at 21 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, in pellet, the volatile ingredient effusion burning of coal heats pellet jointly simultaneously, silicon now in pellet, aluminium pledge material molecular water dewater and resolve into amorphous alumina and silica, and make this material layer temperature rise to 540 DEG C, its heating-up time controls at 9min, heating rate controls at 27 DEG C/min, and this section of thickness of feed layer controls at 0.2m;
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heating pellet, simultaneously in pellet, the fixed carbon of coal takes fire and jointly heats pellet, and the calcareous material part in pellet resolves into calcium oxide and and the amorphous silicon oxide produced in step 3 and aluminium oxide generation chemical reaction, make this material layer temperature rise to 890 DEG C; Its heating-up time controls at 9min, and heating rate controls at 27 DEG C/min, and this section of thickness of feed layer controls at 0.2m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heating pellet, in pellet, the fixed carbon Thorough combustion of coal heats pellet jointly simultaneously, and the calcareous material in pellet all resolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this material layer temperature rise to 1100 DEG C DEG C; Heating-up time controls at 10min, and heating rate controls at 20 DEG C/min, and this section of thickness of feed layer controls at 0.3m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continues heating pellet, and now microwave field makes to produce dipole between material molecule and turns to polarization, produces phase mutual friction between material molecule, and material is liquefied as C
2s, the simultaneously fixed carbon Thorough combustion of coal and chemical heat release acting in conjunction in pellet, makes this material layer temperature rise to 1400 DEG C; And the C generated
2s liquid absorption calcium oxide generates final products C
3s; The heating-up time of this section of bed of material controls at 25min, and heating rate controls at 6.5 DEG C/min, and THICKNESS CONTROL is 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, and the blower fan controlled bottom kiln carries out air blast cooling, obtains final finished; Obtain final material thickness 8m, temperature is down to 100 DEG C from 1400 DEG C, and temperature fall time controls at 3h, and rate of temperature fall controls at 6 DEG C/min.
Embodiment 2
(1) preparing water content 8%, is the raw material ball of 8mm containing coal amount 7%, diameter, and the microcosmic fineness of adjustment material powder is at 100 μm; The frequency in adjustment microwave generator launched microwave source is 930Mhz, and 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) distributing device of the raw material ball prepared by kiln top is continuously added, the microwave field that microwave generator produces is to its laser heating, the temperature of this bed of material is made to rise to 210 DEG C, first water now in raw material ball evaporate, heating-up time controls at 8.5min, and heating rate controls at 27 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, in pellet, the volatile ingredient effusion burning of coal heats pellet jointly simultaneously, silicon now in pellet, aluminium pledge material molecular water dewater and resolve into amorphous alumina and silica, and make this material layer temperature rise to 560 DEG C, its heating-up time controls at 9-13min, heating rate controls at 40 DEG C/min, and this section of thickness of feed layer controls at 0.3m;
(4) completing steps 3, after material continues to move down, the bed of material in microwave field penetration step 3 continues heating pellet, simultaneously in pellet, the fixed carbon of coal takes fire and jointly heats pellet, and the calcareous material part in pellet resolves into calcium oxide and and the amorphous silicon oxide produced in step 3 and aluminium oxide generation chemical reaction, make this material layer temperature rise to 910 DEG C; Its heating-up time controls at 13min, and heating rate controls at 40 DEG C/min, and this section of thickness of feed layer controls at 0.3m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heating pellet, in pellet, the fixed carbon Thorough combustion of coal heats pellet jointly simultaneously, and the calcareous material in pellet all resolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this material layer temperature rise to 1300 DEG C; Heating-up time controls at 10-15min, and heating rate controls at 30 DEG C/min, and this section of thickness of feed layer controls at 0.4m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continues heating pellet, and now microwave field makes to produce dipole between material molecule and turns to polarization, produces phase mutual friction between material molecule, and material is liquefied as C
2s, the simultaneously fixed carbon Thorough combustion of coal and chemical heat release acting in conjunction in pellet, makes this material layer temperature rise to 1450 DEG C; And the C generated
2s liquid absorption calcium oxide generates final products C
3s; The heating-up time of this section of bed of material controls at 30min, and heating rate controls at 8 DEG C/min, and THICKNESS CONTROL is 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, and the blower fan controlled bottom kiln carries out air blast cooling, obtains final finished; Obtain final material thickness 8.5m, temperature is down to 60 DEG C from 1450 DEG C, and temperature fall time controls at 4h, and rate of temperature fall controls at 8 DEG C/min.
Embodiment 3
(1) preparing water content 6%, is the raw material ball of 6mm containing coal amount 6%, diameter, and the microcosmic fineness of adjustment material powder is at 40-100 μm; The frequency in adjustment microwave generator launched microwave source is 915Mhz, and 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) distributing device of the raw material ball prepared by kiln top is continuously added, the microwave field that microwave generator produces is to its laser heating, the temperature of this bed of material is made to rise to 200 DEG C, first water now in raw material ball evaporate, heating-up time controls at 7.5min, and heating rate controls at 24 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, in pellet, the volatile ingredient effusion burning of coal heats pellet jointly simultaneously, silicon now in pellet, aluminium pledge material molecular water dewater and resolve into amorphous alumina and silica, and make this material layer temperature rise to 550 DEG C, its heating-up time controls at 11min, heating rate controls at 33 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, simultaneously in pellet, the fixed carbon of coal takes fire and jointly heats pellet, and the calcareous material part in pellet resolves into calcium oxide and and the amorphous silicon oxide produced in step 3 and aluminium oxide generation chemical reaction, make this material layer temperature rise to 900 DEG C; Its heating-up time controls at 11min, and heating rate controls at 33 DEG C/min, and this section of thickness of feed layer controls at 0.15m;
(5) completing steps 4, after material continues to move down, the bed of material in microwave field penetration step 4 continues heating pellet, in pellet, the fixed carbon Thorough combustion of coal heats pellet jointly simultaneously, and the calcareous material in pellet all resolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this material layer temperature rise to 1200 DEG C; Heating-up time controls at 13min, and heating rate controls at 25 DEG C/min, and this section of thickness of feed layer controls at 0.35m;
(6) completing steps 5, after material continues to move down, the bed of material in microwave field part penetration step 5 continues heating pellet, and now microwave field makes to produce dipole between material molecule and turns to polarization, produces phase mutual friction between material molecule, and material is liquefied as C
2s, the simultaneously fixed carbon Thorough combustion of coal and chemical heat release acting in conjunction in pellet, makes this material layer temperature rise to 1425 DEG C; And the C generated
2s liquid absorption calcium oxide generates final products C
3s; The heating-up time of this section of bed of material controls at 28min, and heating rate controls at 7 DEG C/min, and THICKNESS CONTROL is 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, and the blower fan controlled bottom kiln carries out air blast cooling, obtains final finished; Obtain final material thickness 8m, temperature is down to 80 DEG C from 1425 DEG C, and temperature fall time controls at 3.5h, and rate of temperature fall controls 7 DEG C/min.
Clinker in the present embodiment after microwave calcination contrasts as follows with the test data of the clinker of full coal combustion in same kiln:
Table 1 clinker strength and f-CaO data
| 3d compression strength (Mpa) | 28d compression strength (Mpa) | f-CaO | |
| Microwave radiation technology 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 microwave radiation technology calcination of chamotte
3s content obviously increases, and its characteristic peaks reaches 266CPS, and the grog of common full coal calcination, C
3s levies peak value and reaches 185CPS; And microwave radiation technology calcination of chamotte C
3s crystal grain is obviously less, and its performance is that the width of diffraction peak shape is narrower in the drawings.
And pattern and the content of the ore deposit phase of microwave calcination grog and full coal calcination grog is tested by reflection macroscope macroscope, as shown in Figure 3, microwave radiation technology calcination of chamotte alite crystalline size major part is between 10-25 μm, and there is B ore deposit wrappage in the larger-size A ore deposit of part, belite ore deposit size is between 30-35 μm, in round shaped grain shape, mesophase spherule is evenly distributed, and aluminium mineral material size is less than 15 μm, in column, ferrous aluminate is long column shape crystal, and silicate mineral accounts for 75%, mesophase spherule mineral content 10-25%.
And full coal calcination grog alite crystalline size major part is between 20-25 μm, few part size 40-50 μm, shape is column or irregular tabular, and belite ore deposit size is between 20-35 μm, granular in great circle, black mesophase spherule (C
4aF) white mesophase spherule (C is distributed in crystallite
3a) inner, white mesophase spherule is long column shape crystal, and silicate mineral accounts for 65%, mesophase spherule mineral content 20-30%.
Shown by above-mentioned industrial calcine tests result, microwave radiation technology calcination of cement clinker intensity improves 20-30%, and has more reasonably crystal structure and crystalline size, and institute has practical popularization significance in this way in the industrial production.
Claims (7)
1. the microwave kiln of an auxiliary calcination of cement clinker, comprise the kiln (1) that bottom is provided with blower fan, it is characterized in that: also comprise and rotate 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), and described driving mechanism (3) is connected with rotation kiln hood (2) and rotates kiln hood (3) rotate for driving; Described fixing kiln hood (4) is arranged on and rotates on kiln hood (2); Described distributing device (5) is arranged in fixing kiln hood (4), described waveguide (7) is arranged on microwave generator (6) and connects as one formula structure, described microwave generator (6) is arranged on to rotate on kiln hood (3) and rotates with rotation kiln hood (3), and described waveguide (3) is then tilted to down to be inserted into and rotates in 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) comprises drive motors (31), sprocket wheel (32), loop chain (33), gear wheel (34) and road wheel (35); Described drive motors (31) is fixedly installed, sprocket wheel (32) is arranged on the output shaft of drive motors, the bottom of described rotation kiln hood (2) is provided with annular channel-section steel, described loop chain (33) is arranged in cannelure, and described loop chain (33) is meshed with sprocket wheel (32), described gear wheel (34) is arranged on inside annular channel-section steel, and 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 power supply annular trolley (8) for providing microwave generator (6) power supply; The annular trolley of described power supply (8) is arranged at the top rotating kiln hood (2) ringwise, and is connected with microwave generator (6) by cable.
4. the microwave kiln of a kind of auxiliary calcination of cement clinker according to claim 1, it is characterized in that: the integral structure that described waveguide (7) and microwave generator (6) are formed by connecting is provided with three altogether, and circumferentially decile state is arranged in rotation kiln hood (3).
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: be also provided with exhaust duct (9) in described rotation kiln hood (3); Described exhaust duct (9) reaches the outside of fixing kiln hood (4).
7. the microwave calcination method of a kind of microwave kiln of auxiliary calcination of cement clinker according to claim 1, is characterized in that: comprise the following steps:
(1) preparing water content 4-8%, is the raw material ball of 5-8mm containing coal amount 5-7%, diameter, and the microcosmic fineness of adjustment material powder is at 40-100 μm; The frequency in adjustment microwave generator launched microwave source is 900-930Mhz, and 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) distributing device of the raw material ball prepared by kiln top is continuously added, the microwave field that microwave generator produces is to its laser heating, the temperature of this bed of material is made to rise to 190 DEG C-210 DEG C, first water now in raw material ball evaporate, heating-up time controls at 6.5-8.5min, and heating rate controls at 21 ~ 27 DEG C/min, and this section of thickness of feed layer controls at 0.15-0.2m, 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 heating pellet, in pellet, the volatile ingredient effusion burning of coal heats pellet jointly simultaneously, silicon now in pellet, aluminium pledge material molecular water dewater and resolve into amorphous alumina and silica, and make this material layer temperature rise to 540 DEG C-560 DEG C, its heating-up time controls at 9-13min, heating rate controls at 27 ~ 40 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, simultaneously in pellet, the fixed carbon of coal takes fire and jointly heats pellet, and the calcareous material part in pellet resolves into calcium oxide and and the amorphous silicon oxide produced in step 3 and aluminium oxide generation chemical reaction, make this material layer temperature rise to 890 DEG C-910 DEG C; Its heating-up time controls at 9-13min, and heating rate controls at 27 ~ 40 DEG C/min, and this section of thickness of feed layer controls 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 heating pellet, in pellet, the fixed carbon Thorough combustion of coal heats pellet jointly simultaneously, and the calcareous material in pellet all resolve into calcium oxide and and step 4 in generation amorphous silicon oxide and aluminium oxide generation chemical reaction, make this material layer temperature rise to 1100 DEG C-1300 DEG C; Heating-up time controls at 10-15min, and heating rate controls at 20 ~ 30 DEG C/min, and this section of thickness of feed layer controls 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 continues heating pellet, and now microwave field makes to produce dipole between material molecule and turns to polarization, produces phase mutual friction between material molecule, and material is liquefied as C
2s, the simultaneously fixed carbon Thorough combustion of coal and chemical heat release acting in conjunction in pellet, makes this material layer temperature rise to 1400-1450 DEG C; And the C generated
2s liquid absorption calcium oxide generates final products C
3s; The heating-up time of this section of bed of material controls at 25-30min, and heating rate controls at 6.5 ~ 8 DEG C/min, and 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, and the blower fan controlled bottom kiln carries out air blast cooling, 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 controls at 3-4h, and rate of temperature fall controls at 6 ~ 8 DEG C/min.
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| 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 |
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