CN103542716B - Cement clinker burning system control method - Google Patents
Cement clinker burning system control method Download PDFInfo
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- CN103542716B CN103542716B CN201310526807.4A CN201310526807A CN103542716B CN 103542716 B CN103542716 B CN 103542716B CN 201310526807 A CN201310526807 A CN 201310526807A CN 103542716 B CN103542716 B CN 103542716B
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Abstract
The present invention relates to a kind of cement clinker burning system control method, particularly relate to the control method of novel dry-method cement clinker production system, comprise air feed system, coal dust supply system, control the valve of tertiary-air pipe, make its aperture 70% ~ 100%; Control coal injection pipe and be positioned at more than kilneye center line.Instant invention overcomes prior art deficiency, by reasonable operation, reduce SR, improve dore furnace ability, improve tertiary air temperature, eliminate tertiary-air pipe dust stratification, improve the triple air pipe valve life-span, systems stabilisation operating condition, improve output, improve and stable clinker quality, reduce hear rate, emissions reduction.
Description
Technical field
The present invention relates to a kind of cement clinker burning system control method, particularly relate to the control method of novel dry-method cement clinker production system.
Background technology
Manufacture of cement successively experienced by the developing stage such as storehouse kiln, shaft kiln, dry-process rotory kiln, wet process rotary kiln and NSP rotary kiln, the final predecomposition new type nonaqueous cement calcining technology forming the modern times.
The operation of cement clinker burning system is the important process being directly connected to cement quality and cost.The core of new dry cement production technology is suspension preheating and precal cination technique.Therefore, adopt the firing system of precal cination technique, first need to ensure kiln tail preheater system particularly dore furnace normal, stable, work efficiently.And make it play preheating predecomposition effect to greatest extent.And the new dry process sinter leaching production line run at present, always for many years be that continuity one is substantially identical that Principles and ways operates.The characteristicness that this method is in operation is:
The valve opening of tertiary-air pipe controls 30% ~ 50%, to strengthen kiln ventilation; The flame adjusting of coal injection pipe is active strong, coal injection pipe is positioned at fourth quadrant, strengthens flame to the direct heat exchange action of grog.
Along with progress and social environment the improving constantly noxious gas emission requirements such as energy-saving and emission-reduction and minimizing nitrogen oxide of NSP technology.This old control method has been felt to be difficult to adapt to these requirements gradually.
Summary of the invention
According to above deficiency of the prior art, the technical problem to be solved in the present invention is: provide a kind of cement clinker burning system control method, realizes high-quality, the high yield of Cement clinker buring, low consumption, low emission.
Cement clinker burning system control method of the present invention, comprises air feed system, coal dust supply system, controls the valve of tertiary-air pipe, makes its aperture 70% ~ 100%; Control coal injection pipe and be positioned at more than kilneye center line.
Opened greatly by triple air pipe valve, the obvious benefit brought is: the on-way resistance of tertiary-air pipe reduces, and reduces from kiln head cover to decomposition furnace outlet kiln, equalizing pressure that two, stove is serial; The temperature reduced in the course of conveying of tertiary air from kiln head cover to dore furnace is fallen, and improves temperature when tertiary air enters dore furnace; The wearing and tearing of triple air pipe valve reduce; Dust stratification in tertiary-air pipe reduces even does not have dust stratification.These effects are all that production manager is wished and cannot accomplish in the past.Control coal injection pipe and be positioned at more than kilneye center line, improve heat exchanger effectiveness, avoid the formation of the operating mode of reducing atmosphere, improve material simultaneously and move forward speed, improve output.
Keep valve opening 70% ~ 100%, control the blower fan of grate-cooler one section, to provide sufficient combustion air in rotary kiln, make coal dust Thorough combustion, reduce energy consumption, make constant product quality.
Controlling coal injection pipe is positioned at kilneye center line for initial point, and with kilneye cross section horizontal direction for X-axis, in the rectangular coordinate system being Y-axis with kilneye cross section vertical direction, X-axis is 0, and Y-axis is 5mm ~ 100mm.
Comprise further: control coal injection pipe, adjustment flame profile is normal flame, and flame temperature difference is in the longitudinal direction diminished, can close to the operating mode of constant temperature, and normal flame profile is long and evenly, finally form the state of arts close to calcining at constant temperature.Adopt the grog that normal flame calcining system burns out, steady quality, be not easy the great fluctuation process occurring that free calcium is fluctuated, simultaneously because burning zone temperature is stablized, the grog generated under grog knot grain is better than other several calcining systems.
Control kiln head cover Wen Du≤1100 DEG C, preferable temperature, at 1100 DEG C ~ 1200 DEG C, reduces system coal consumption.
Control the valve of tertiary-air pipe, make its aperture at 70%-100%; Controlling coal injection pipe is positioned at kilneye center line for initial point, and with kilneye cross section horizontal direction for X-axis, in the rectangular coordinate system being Y-axis with kilneye cross section vertical direction, X-axis is 0, and Y-axis is 5mm ~ 100mm; Control kiln head cover Wen Du≤1100 DEG C.
Operation principle:
Adopt the firing system of precal cination technique, first need to ensure the normal table work of kiln tail preheater system particularly dore furnace, and make it play a role to greatest extent.What first will ensure dore furnace uses wind, and like this, the valve of tertiary-air pipe just should be opened as much as possible, makes its aperture reach 70%-100%, increases dore furnace air quantity, ensures that in dore furnace, practical flow field is more close to the flow field of design.Existing experiment proves, after the increasing by air quantity and temperature of dore furnace, can accelerate the burning of coal dust.When decrease in kiln with air quantity after; can adopt and widen kiln ventilation to elongate the way of coal injection pipe flame; the shape of flame is reduced by the impact of extraneous (kiln ventilation); can be easy to adjust flame profile; form the calcination operation system of normal flame calcining; thus the clinker quality burnt out is stablized, be not easy the great fluctuation process occurring that free calcium is fluctuated.
More than 60% ~ 70%, often there is the phenomenon of kiln ventilation deficiency, in this case in the valve open amplitude of tertiary-air pipe, if continue to improve output, the phenomenon that coal consumption will be caused significantly to increase, makes the hear rate of grog sharply increase again, form output higher, the phenomenon that hear rate is higher.But also because coal dust can not Thorough combustion, can easily cause the situation of quality instability.Therefore, need during operation to provide air quantity with the blower fan of grate-cooler one section, or improve the wind supply quantity of coal injection pipe, make coal dust Thorough combustion, reduce energy consumption, make constant product quality.
When Wen Du≤1100 DEG C of kiln head cover are also stablized, the coal consumption of system just can reduce, and the quenching effect of grog is good simultaneously.
Coal injection pipe is positioned at more than kilneye center line, be according in rotary kiln heat transfer have three kinds of heat exchange methods: the principle of conduction, convection current, radiation and the length diameter ratio reasonable value of rotary kiln are at 10-12(rotary furnace) principle determine.Be positioned at by coal injection pipe after more than kilneye center line, one is the thermal current that can utilize flame combustion to greatest extent, heats kliner coating.Forward below at high temperature kliner coating, when contacting with kliner coating in the process not having relative movement above grog is deposited in, fully carry out heat exchange, improve heat exchanger effectiveness.Two be that of avoiding flame from grog too close to, coal ash easily falls into the operating mode that grog forms reducing atmosphere.Three is that the anterior thermal current of flame has blowed to the top entering kiln raw material, instead of faces the material moved forward, and the speed making material move forward like this improves.The raw material of 85% ~ 95% have been decomposed, at essential mineral C for calcium carbonate
3before the stable formation of S, fast to the speed of clinkering zone from kiln tail, programming rate is also just fast.The infiltration rate of CaO is also faster, is more conducive to the formation of C3S.The activation energy of the new-ecology oxides such as CaO and reactivity obtain fully and timely utilizing, and clinker mineral knot grain formed in this case is good, many one-tenth crystallites and microcellular structure.Not only can stablize and improve clinker quality and 28d intensity, and grindability is improved.This localization method, accelerates the translational speed of raw material in intermediate zone, and therefore technologically, part serves the effect shortening kiln cylinder body length.
The beneficial effect that the present invention is compared with prior art had is:
Instant invention overcomes prior art deficiency, by reasonable operation, reduce SR, improve dore furnace ability, improve tertiary air temperature, eliminate tertiary-air pipe dust stratification, improve the triple air pipe valve life-span, systems stabilisation operating condition, improve output, improve and stable clinker quality, reduce hear rate, emissions reduction.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention will be further described:
Embodiment 1:
This cement clinker burning system control method, comprises air feed system, coal dust supply system, controls the valve of tertiary-air pipe, makes its aperture 95%; Control the blower fan of two sections, in rotary kiln, provide air quantity; Control coal injection pipe, adjustment flame profile is normal flame, adopts normal flame calcinating system.With kilneye center line for initial point, with kilneye cross section horizontal direction for X-axis, with kilneye cross section vertical direction for Y-axis sets up rectangular coordinate system, it is (0,5mm) that control coal injection pipe is positioned at (X, Y) in this rectangular coordinate system; Control kiln head cover Wen Du≤1100 DEG C.
Embodiment 2:
This cement clinker burning system control method, comprises air feed system, coal dust supply system, controls the valve of tertiary-air pipe, makes its aperture 70%; Control coal injection pipe, adjustment flame profile is normal flame, adopts normal flame calcinating system.With kilneye center line for initial point, with kilneye cross section horizontal direction for X-axis, with kilneye cross section vertical direction for Y-axis sets up rectangular coordinate system, it is (0,30mm) that control coal injection pipe is positioned at (X, Y) in this rectangular coordinate system; Control kiln head cover Wen Du≤1100 DEG C.
Embodiment 3:
This cement clinker burning system control method, comprises air feed system, coal dust supply system, controls the valve of tertiary-air pipe, makes its aperture 100%; Control coal injection pipe, adjustment flame profile is normal flame, adopts normal flame calcinating system.With kilneye center line for initial point, with kilneye cross section horizontal direction for X-axis, with kilneye cross section vertical direction for Y-axis sets up rectangular coordinate system, it is (0,100mm) that control coal injection pipe is positioned at (X, Y) in this rectangular coordinate system; Control kiln head cover Wen Du≤1100 DEG C.
Comparative example 1:
Working condition is: rotary kiln, bi serie preheater, the two air intake of dore furnace, and third generation grate-cooler, adopts the low NO of primary air flow <6%, band cogeneration.Triple air pipe valve aperture is 45%, and coal injection pipe position location (X, Y) is (20mm ,-20mm).
Comparative example 2:
Working condition is: rotary kiln, bi serie preheater, the two air intake of dore furnace, third generation grate-cooler.Triple air pipe valve aperture is 25%, and coal injection pipe position location (X, Y) is (20mm ,-20mm).
Comparative example 3:
Working condition is: rotary kiln, bi serie preheater, the two air intake of dore furnace, third generation grate-cooler.Triple air pipe valve aperture is 40%, and coal injection pipe position location (X, Y) is (20mm ,-20mm).
Table 1: effectiveness comparison table
Known by table 1, embodiment 1 is compared with comparative example 1, and output adds 200t/d, and free calcium levels reduces 0.2%, and grog 3d intensity and 28d intensity all have a distinct increment, and coal dust use amount reduces 15% simultaneously.
Embodiment 2 is compared with comparative example 2, and output adds 200t/d, and free calcium levels reduces 0.25%, and grog 3d intensity and 28d intensity all have a distinct increment, and coal dust use amount reduces 30% simultaneously.
Embodiment 3 is compared with comparative example 3, and output adds 250t/d, and free calcium levels reduces 0.3%, and grog 3d intensity and 28d intensity all have a distinct increment, and the amount of coal dust practicality simultaneously reduces 30%.
The embodiment of the present invention 1 ~ 3 also reaches following effect: nitrogen oxide reduces 80-100mg/m
3; Decomposition furnace outlet pressure reduces 400Pa; Tertiary air temperature improves 80-100 DEG C; Triple air pipe valve is substantially without wearing and tearing; Substantially without dust stratification in tertiary-air pipe; System run all right, can need not carry out large operation in several days
Known by contrasting, instant invention overcomes prior art deficiency, by reasonable operation, improve the seed output and quality of grog, greatly save energy consumption simultaneously, reduce discharge.
Claims (6)
1. a cement clinker burning system control method, comprises air feed system, coal dust supply system, it is characterized in that:
Control the valve of tertiary-air pipe, make its aperture 70% ~ 100%;
Control coal injection pipe and be positioned at more than kilneye center line.
2. cement clinker burning system control method according to claim 1, is characterized in that: keep triple air pipe valve aperture 70% ~ 100%, control the blower fan of grate-cooler one section, to provide sufficient combustion air in rotary kiln.
3. cement clinker burning system control method according to claim 1, it is characterized in that: control coal injection pipe and be positioned at kilneye center line for initial point, with kilneye cross section horizontal direction for X-axis, in the rectangular coordinate system being Y-axis with kilneye cross section vertical direction, X-axis is 0, and Y-axis is 5mm ~ 100mm.
4. cement clinker burning system control method according to claim 3, is characterized in that: comprise further: control coal injection pipe, and adjustment flame profile is normal flame.
5. cement clinker burning system control method according to claim 1, is characterized in that: control kiln head cover Wen Du≤1100 DEG C.
6. cement clinker burning system control method according to claim 1, is characterized in that: comprising:
Control the valve of tertiary-air pipe, make its aperture at 70%-100%;
Controlling coal injection pipe is positioned at kilneye center line for initial point, and with kilneye cross section horizontal direction for X-axis, in the rectangular coordinate system being Y-axis with kilneye cross section vertical direction, X-axis is 0, and Y-axis is 5mm ~ 100mm;
Control kiln head cover Wen Du≤1100 DEG C.
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| CN109631572A (en) * | 2018-11-23 | 2019-04-16 | 中国葛洲坝集团水泥有限公司 | A kind of new type nonaqueous cement production line kiln hood burner localization method |
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