CN104084035B - Cement rotary kiln Dry denitration technique and equipment thereof - Google Patents
Cement rotary kiln Dry denitration technique and equipment thereof Download PDFInfo
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Abstract
Cement rotary kiln Dry denitration technique and equipment thereof, belong to cement denitration technology field.It is characterized in that, processing step is: the parallel flue of cement kiln rotary kiln (20) kiln tail to one section of kiln upper shed of level V preheater (18) bottom of five-stage cyclone preheater and wind send and be blown into urea granules; The aperture position temperature of level V preheater at 850 DEG C ~ 950 DEG C, NO in the addition of urea and the flue gas of level V preheater
xmol ratio be 1 ~ 2.5:3.The apparatus characteristic of denitrating technique is: insert blower pipe (10) in level V preheater (18) lower openings, and blower pipe (10) connects urea blowing device.It is little that the technology of the present invention device changes investment, and a denitration completes, and this technology is Dry denitration, can not increase large quantity of moisture, do not affect kiln atmosphere in kiln, can not cause heat losses.Reaction thoroughly can not cause the escaping of ammonia.
Description
Technical field
Cement rotary kiln Dry denitration technique and equipment thereof, belong to cement denitration technology field.
Background technology
The production process of cement kiln supervenes a large amount of oxynitrides, and this kind of nitrogen oxide is one of main atmosphere pollution.Traditional gas denitrifying technology is SCR technology and SNCR technology, and SCR technology denitration efficiency is high, but system complex, and catalyst life is short, and operating cost is high.And SNCR technical operation cost is few, system is simple, but its denitration efficiency is low, can not reach the standard of discharge now.
Chinese patent CN102512925B " a kind of cement kiln flue-gas denitration process and denitrification apparatus " discloses after a kind of wet denitration again in conjunction with the cement kiln denitration technology of SCR technology secondary denitration.This technology sprays into reducing agent at 1/2nd places of the tail flue gas pipeline of cement decomposition kiln, the preferred 10m/s ~ 20m/s of the speed that sprays into of reducing agent.Reducing agent straying quatity is the NH in reducing agent
3be 1.1: 1 ~ 2.5: 1 with the mol ratio of the NOx in flue gas.Then flue gas enters SCR reactor again and utilizes catalyst to carry out secondary denitration.Reducing agent wherein used is one or more in liquefied ammonia, ammoniacal liquor or urea.This denitrating technique is applicable to cement kiln denitrating flue gas, and denitration efficiency is high.But change comparatively large to cement kiln, technique obviously imitates the denitration of coal-burning boiler, needs secondary denitration just can get a desired effect.And the mode that sprays into of its reducing agent does not break away from the restriction of wet denitration, need reducing agent to be prepared as solution or liquidly could realize spraying into by flow velocity.The reductant solution that this wet denitration uses exist inflammable, explosive, perishable, not easily transport, store the shortcoming of difficulty, operating cost is high.Moreover containing large quantity of moisture in injection denitrfying agent, affect cement burning quality and kiln atmosphere, main is cause cement kiln heat losses, increase coal consumption.During operation, operation requirements is strict, and its excessive ammonia added easily causes the escaping of ammonia, forms secondary pollution; Otherwise then need the exhaust treatment system increasing ammonia.Because its equipment energy characteristic also needs first to be prepared into urea liquid when using the carbamide reducing agent of unique convenient transportation, the large quantity of moisture in urea liquid causes the problem of cement kiln heat losses.Urea, in aqueous to thermally labile, is heated to 80 DEG C and just can be decomposed into ammonia and carbon dioxide.Actual effect and ammoniacal liquor almost do not have difference.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provides that a kind of technological process is short, operating cost supports, heat losses is little in cement kiln cement rotary kiln Dry denitration technique and equipment thereof.
The technical solution adopted for the present invention to solve the technical problems is: this cement rotary kiln Dry denitration technique, it is characterized in that, processing step is: the parallel flue of cement kiln rotary kiln to one section of kiln upper shed of the level V preheater bottom of five-stage cyclone preheater and wind send and be blown into urea granules; Described aperture position temperature is at 850 DEG C ~ 950 DEG C, and urea at these elevated temperatures thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, and reaches the effect of denitration; Wherein NO in the addition of urea and the flue gas of level V preheater
xmol ratio be 1 ~ 2.5:3.
The particle diameter of described urea granules is 0.5mm ~ 2mm.
Dry denitration technology is with the urea of high reaction activity for raw material, and urea is as a kind of solid ammonia base reductant (NR
3) be blown in temperature range at 850 DEG C ~ 950 DEG C, rapid and NO
xthere is reduction reaction and reach denitration object.It has transport, stores conveniently, the plurality of advantages such as power consumption is few.Utilizing urea to carry out Dry denitration technology is utilize amino reductive (NR
3) medium reaction temperature, without the need under catalysts conditions with NO
xreact and reach denitration object.Dry denitration technology does not introduce moisture in denitrification process, can not increase coal consumption, also can not destroy kiln atmosphere because of reduction temperature.
Urea under drying condition at high temperature decomposes and produces ammonia and cyanic acid, and the nitrogen element being in reduction-state exists with ammonia and cyanic acid two kinds of forms, can not produce water and carbon dioxide and affect kiln atmosphere and cement burning quality in pyrolysis process.Ammonia and cyanic acid are at high temperature to NO
xcarry out denitration reaction, realize the efficient removal of low mole prop0rtion.Cyanic acid is at high temperature as NO
xa kind of rapidly-decomposing, can 8HNCO+6NO be there is
2=7N
2+ 8CO
2+ 4H
2the reaction of O.Due to ammonia and cyanic acid and NO
xdemand temperature during reaction is different, so the temperature range that in the present invention, the nitrogen element of reduction-state adapts to is wider, and can to NO in five-stage cyclone preheater
xcarry out more thorough denitration.NO
xonce remove thoroughly, without the need to secondary denitration, simplification of flowsheet, simplifies cement equipment and changes.Eliminate wet denitration because of denitration efficiency low, excess ammonia drop into can not with NO
xabundant reflection causes the problem of the escaping of ammonia, or needs follow-up problem of carrying out ammonia vent gas treatment.
Simultaneously because urea of the present invention be blown into point selection on the one section kiln of the parallel flue of rotary kiln to the level V preheater bottom of five-stage cyclone preheater, the flue dust flow direction in this section of kiln is in whirlwind formation point and makes the thermal decomposition product of urea at five-stage cyclone preheater internal circulation flow, add time of contact, sufficient and NO
xreact.Add urea in other positions because be not be in whirlwind to form point, the nitrogen element of reduction-state all or can not can not all participate in five-stage cyclone preheater internal circulation flow, and denitration efficiency reduces.
A kind of equipment of above-mentioned cement rotary kiln Dry denitration technique, comprise five-stage cyclone preheater, the level V preheater of five-stage cyclone preheater is by parallel flue conjunctive decomposition kiln, rotary kiln is connected bottom level V preheater, it is characterized in that: insert blower pipe in the parallel flue of cement kiln rotary kiln to one section of kiln upper shed of the level V preheater bottom of five-stage cyclone preheater, blower pipe connects urea blowing device.
Described urea blowing device comprises urea lifting subassembly, urea storage weighs assembly, airflow blow assembly, urea lifting subassembly is the bucket elevator that bottom is provided with hopper, urea storage assembly of weighing comprises feed bin and conveying worm, bucket elevator top is connected to feed bin top by feed-line, feed bin runs through and is provided with loosening device, connect conveying worm under bin bottom opening, the discharging opening of conveying worm is connected airflow blow assembly and is blowed urea to level V preheater by blower pipe.This equipment Bian mechanical feed and strength feeding associated form, the raw material Bian elevator that puts in storage is carried, and enter raw material cabin, denitrfying agent enters kiln Bian Geldart-D particle, and Bian air compressor is wind-power, utilizes blast to be sent in air channel by denitrfying agent.
Described loosening device comprises variable frequency reducer motor, agitator arm, agitating vane, and agitator arm runs through and protrudes from feed bin, and agitator arm top is connected with variable frequency reducer motor, is connected to feed bin under shed bottom agitator arm, and agitating vane is spirally wound on agitator arm lower end.Can by the addition regulating agitating vane rotating speed tentatively to regulate urea.
Described conveying worm connects variable-frequency motor.Rotational speed regulation urea conveying capacity can be changed in real time by regulating variable-frequency motor rotating speed.
Described airflow blow assembly comprises air compressor and venturi-type eductors, the gas outlet of air compressor connects the air inlet of venturi-type eductors by compressor reducer pipeline, the charging aperture of venturi-type eductors connects the discharging opening of conveying worm, and the outlet that blows of venturi-type eductors connects blower pipe.
Described air compressor air inlet pipeline is connected with source of the gas tank.
Described feed bin side is provided with observation window.The surplus of urea in feed bin can be observed at any time.
NO is provided with in described level V preheater
xcontent real-time detection apparatus, the in real time corresponding adjustment urea amount of being blown into.The design of dry method flue gas denitration device adopts the mode regulated in real time, by the nitrogen content of the exhaust gas volumn of kiln, air quantity and coal dust, by the method for table ratio, adjusts the amount of being blown into of urea at any time, reach required denitration treatment effect.
This device can Bian plc automatic control system, connects environmental protection online detection instrument port, can set NO
xcontrolled concentration, autofeed, is controlled by Central Control Room.
Because dry method flue gas denitration device adopts the mixing of gas gas, as long as flue-gas temperature > 850 DEG C, the treatment effect of expection can be reached.Under the different load condition of cement kiln, the adaptability of gas gas mixing, stability, denitration efficiency are better in the interval internal ratio gas-liquid mixed of effective temperature, less on inner operating impact.
Dry method flue gas denitrfying agent (urea) all gasifies when flue-gas temperature > 850 DEG C, with the NO in flue gas
xreduction reaction occurs, and product is nitrogen, carbon dioxide and water, can not cause damage to kiln body.
Because dry method flue gas denitration raw material (urea) is packed, so use manual method to drop in hopper by urea, be transported in feed bin by bucket elevator; In feed bin, also blanking is until wind is delivered in flue in metering, and omnidistance enforcement fixing quantity, according to smoke dust discharge concentration and control discharge concentration adjustment feeding amount, and whether environmental protection on-line detector display denitration reaches discharging standards.
Urea is the temperature being blown into position as the topmost process choice of denitrfying agent.Namely select the optimum temperature point that cement kiln flue dust flows to, because urea can decompose by heat of gasification 200 DEG C ~ 250 DEG C (I look into be 160 DEG C) times, 850 DEG C ~ 950 DEG C time, reach reduction optimum efficiency, at this temperature, catabolite and NO
xproduce chemical reaction, add the special cyclone structure of cement kiln preheater, the nitrogen of reduction-state and NO in catabolite
xat preheater internal circulation flow, successively after five-stage cyclone preheater, the denitration effect of expection will be reached, escape and secondary pollution can not be produced.
The shower nozzle that blower pipe inserts level V preheater is heat resisting pipe.
Cement plant need not increase and reforming technology, equipment, only need at a set of urea blowing device of the other increase of kiln tail preheater.
Need not arrange professional production post, because the requirement of putting in storage of this raw materials technology is Manual material feeding, disposable the feeding intake of workman can be arranged to put in storage according to the denitrfying agent use amount of every day, work regular visit is patrolled and examined in device arrangement.
Feed bin Bian electronics weighing; Bin blanking Bian frequency conversion spiral blanking, according to conputer controlled determination blanking-quantity, solves feed opening easily stifled problem simultaneously; Carry Bian electronic scale under storehouse, automatically adjust denitrfying agent consumption according to NOx concentration at any time.
Compared with prior art, the beneficial effect that cement rotary kiln Dry denitration technique of the present invention and equipment thereof have is: the technology of the present invention Bian denitration raw material is granular urea, and the factor of nontoxic, tasteless, the safety in production that has no effect, shipping storage is convenient.
It is little that the technology of the present invention unit when practical application changes investment, and a denitration completes, and without the need to increasing secondary denitration device, technological process is short.Without the need to increasing urea melting equipment, equipment operating cost is low.This technology is Dry denitration, can not increase large quantity of moisture, do not affect kiln atmosphere in kiln, and can not cause heat losses, in cement kiln, heat losses is little.
The present invention reacts and thoroughly can not cause the escaping of ammonia.Because Bian urea is denitration raw material, and mode of movement is machinery and strength hybrid mode, and feed bin, pipeline, auxiliary equipment all need not use anti-corrosion material, have saved device fabrication cost and maintenance cost.
Accompanying drawing explanation
Fig. 1 is a kind of urea blowing device structural representation of cement rotary kiln Dry denitration technique of the present invention.
Fig. 2 is the urea mouth blown position view of cement rotary kiln Dry denitration technique of the present invention.
Wherein: 1, hopper 2, bucket elevator 3, loosening device 4, feed bin 5, conveying worm 6, venturi-type eductors 7, air compressor 8, source of the gas tank 9, compressor reducer pipeline 10, blower pipe 11, variable frequency reducer motor 12, agitator arm 13, agitating vane 14, first order preheater 15, second level preheater 16, third level preheater 17, fourth stage preheater 18, level V preheater 19, decomposition kiln 20, rotary kiln.
Detailed description of the invention
Fig. 1 ~ 2 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 2, the present invention will be further described.
With reference to accompanying drawing 1,2: the equipment of a kind of cement rotary kiln Dry denitration technique of the present invention, comprise five-stage cyclone preheater, the level V preheater 18 of five-stage cyclone preheater is by flue conjunctive decomposition kiln 19, connect rotary kiln 20 by parallel flue bottom level V preheater 18, in level V preheater 18, be provided with NO
xcontent real-time detection apparatus, the in real time corresponding adjustment urea amount of being blown into.Blower pipe 10 is inserted in the parallel flue of rotary kiln 20 kiln tail to one section of kiln upper shed of level V preheater 18 bottom, blower pipe 10 connects urea blowing device, urea is blown into level V preheater 18 thermal decomposition, and thermal decomposition product circulates and and NO with flue gas successively process, fourth stage preheater 17, third level preheater 16, second level preheater 15, first order preheater 14
xreaction; The bucket elevator 2 of hopper 1, feed bin 4, conveying worm 5 and airflow blow assembly is provided with bottom urea blowing device comprises, bucket elevator 2 top is connected to feed bin 4 top by feed-line, feed bin 4 runs through loosening device 3 is set, loosening device 3 comprises variable frequency reducer motor 11, agitator arm 12, agitating vane 13, agitator arm 12 runs through and protrudes from feed bin 4, agitator arm 12 top is connected with variable frequency reducer motor 11, be connected to feed bin 4 under shed bottom agitator arm 12, agitating vane 13 is spirally wound on agitator arm 12 lower end; Urea addition can be tentatively regulated by regulating variable frequency reducer motor 11 rotating speed; Connect conveying worm 5 under feed bin 4 bottom opening, conveying worm 5 is driven by variable-frequency motor, can change rotational speed regulation urea conveying capacity in real time.The discharging opening of conveying worm 5 is connected airflow blow assembly and is blowed urea to level V preheater 18 by blower pipe 10.Airflow blow assembly comprises air compressor 7 and venturi-type eductors 6, and air compressor 7 air inlet pipeline is connected with source of the gas tank 8.The gas outlet of air compressor 7 connects the air inlet of venturi-type eductors 6 by compressor reducer pipeline 9, the charging aperture of venturi-type eductors 6 connects the discharging opening of conveying worm 5, and the outlet that blows of venturi-type eductors 6 connects blower pipe 10.Wherein, denitrfying agent is sent into bucket elevator 2 by hopper 1; Denitrfying agent is risen to feed bin 4 by bucket elevator 2; Denitrfying agent is evenly sent into conveying worm 5 and is utilized variable frequency reducer motor 11 to realize primary metrology function by loosening device 3, has agitating device to increase denitrfying agent mobility bottom loosening device 3; Feed bin 4 is also provided with function of weighing mainly as denitrfying agent container, and conveying worm 5 is weighed and denitrfying agent is evenly sent into venturi-type eductors 6; Venturi-type eductors 6 utilizes Venturi effect to spray into level V preheater 18 by after the supercharging of denitrfying agent urea.
Embodiment 1
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 0.5mm ~ 1.5mm blows the level V preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2:3 is blown into urea.The aperture position urea of Real-Time Monitoring level V preheater is blown into front temperature at 900 DEG C, and urea is blown into rear temperature at 899 DEG C, does not occur the obvious temperature difference before and after urea is blown into; Under the high temperature of urea in level V preheater, thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 40mg/m
3, the concentration of ammonia is 1.1ppm.
Embodiment 2
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 1.0mm ~ 2mm blows the level V preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 1.8:3 is blown into urea.The aperture position urea of Real-Time Monitoring level V preheater is blown into front temperature at 890 DEG C, and urea is blown into rear temperature at 889 DEG C, does not occur the obvious temperature difference before and after urea is blown into; Under the high temperature of urea in level V preheater, thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 42mg/m
3, the concentration of ammonia is 1.2ppm.
Embodiment 3
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 0.5mm ~ 2mm blows the level V preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.5:3 is blown into urea.The aperture position urea of Real-Time Monitoring level V preheater is blown into front temperature at 850 DEG C, and urea is blown into rear temperature at 850 DEG C, does not occur the obvious temperature difference before and after urea is blown into; Under the high temperature of urea in level V preheater, thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 39mg/m
3, the concentration of ammonia is 1.0ppm.
Embodiment 4
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is that the urea of 0.5mm ~ 2mm blows to the mouth blown on the parallel flue of cement kiln rotary kiln through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 1:3 is blown into urea.The aperture position urea of Real-Time Monitoring level V preheater is blown into front temperature at 950 DEG C, and urea is blown into rear temperature at 949 DEG C, does not occur the obvious temperature difference before and after urea is blown into; Under the high temperature of urea in level V preheater, thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 47mg/m
3, the concentration of ammonia is 0.8ppm.
Comparative example 1 position
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is that the urea of 0.5mm ~ 1.5mm blows to level V preheater and the flue centre position of decomposing between kiln through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.0:3 is blown into urea.The aperture position urea of Real-Time Monitoring level V preheater is blown into front temperature at 900 DEG C, and urea is blown into rear temperature at 900 DEG C, does not occur the obvious temperature difference; Urea is decomposed into ammonia and cyanic acid in parallel flue, and the thermal decomposition product of part urea flows, with NO in flue gas with flue gas recirculation in five-stage cyclone preheater
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 91mg/m
3, the concentration of ammonia is 8ppm.
Comparative example 2 position
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 0.5mm ~ 1.5mm blows the fourth stage preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.0:3 is blown into urea.The aperture position urea of Real-Time Monitoring fourth stage preheater is blown into front temperature at 860 DEG C, and urea is blown into rear temperature at 860 DEG C, does not occur the obvious temperature difference; Under the high temperature of urea in fourth stage preheater, thermal decomposition is ammonia and cyanic acid, and the thermal decomposition product of urea flows, with NO in flue gas with flue gas recirculation in five-stage cyclone preheater
xgeneration non-catalytic reduction reacts, the NO of first order preheater outlet
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 163mg/m
3, the concentration of ammonia is 17ppm.
Comparative example 3 temperature
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 0.5mm ~ 1.5mm blows the level V preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.0:3 is blown into urea.The aperture position urea controlling level V preheater is blown into front temperature at 750 DEG C, and urea is blown into rear temperature at 749 DEG C, does not occur the obvious temperature difference; Owing to not having very first time thermal decomposition to be ammonia and cyanic acid under the high temperature of urea in level V preheater, the thermal decomposition product of part urea forms point at non-whirlwind and decomposes, and cannot all flow, with NO in flue gas with flue gas recirculation
xgeneration non-catalytic reduction reacts, the NO in first order preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 96mg/m
3, the concentration of ammonia is 9ppm.
Comparative example 4 temperature
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.The particle diameter of particle is the urea of 0.5mm ~ 1.5mm blows the level V preheater to cement kiln five-stage cyclone preheater bottom mouth blown through urea blowing device; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.0:3 is blown into urea.The aperture position urea controlling level V preheater is blown into front temperature at 1100 DEG C, and urea is blown into rear temperature at 1100 DEG C, does not occur the obvious temperature difference; Under the high temperature of urea in level V preheater, thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, the NO in first order preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 47mg/m
3, the concentration of ammonia is 1.2ppm.Temperature promotes further and does not obtain better denitration effect, increases energy consumption in vain, and even because temperature is too high, air-flow comparatively fast could not reach best denitration effect.
Comparative example 5 solution
NO in level V preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 800mg/m
3.Concentration be 10% urea liquid spray into the bottom mouth blown of the level V preheater of cement kiln five-stage cyclone preheater with the speed of 15m/s; With NO in the flue gas of the addition of urea and level V preheater
xmol ratio be that 2.0:3 sprays into urea.The aperture position urea of Real-Time Monitoring level V preheater sprays into front temperature at 900 DEG C, and urea sprays into rear temperature at 800 DEG C, produces the larger temperature difference, and produce a large amount of steam before and after urea sprays into; Increase the aperture position temperature return to 900 DEG C that Coal-fired capacity makes level V preheater.Under the high temperature of urea in level V preheater and steam reaction generate ammonia and carbon dioxide, NO in the ammonia of single reducing component and flue gas
xgeneration non-catalytic reduction reacts, the NO in first order preheater
xcontent real-time detection apparatus detects NO in flue gas
xconcentration is 189mg/m
3, the concentration of ammonia is 41ppm.Spray containing large quantity of moisture in denitrfying agent, affect cement burning quality and kiln atmosphere, main is cause cement kiln heat losses, increases coal consumption.The adaptive temperature narrow range of the best reducing activity of the ammonia of single reducing component, cannot in cyclic process fully and NO
xreaction.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a cement rotary kiln Dry denitration technique, it is characterized in that, processing step is: the parallel flue of cement kiln rotary kiln (20) kiln tail to one section of kiln upper shed of level V preheater (18) bottom of five-stage cyclone preheater and wind send and be blown into urea granules; Aperture position temperature is at 850 DEG C ~ 950 DEG C, and urea at these elevated temperatures thermal decomposition is ammonia and cyanic acid, the thermal decomposition product of urea in five-stage cyclone preheater with flue gas recirculation flowing, successively in the process of five-stage cyclone preheater with NO in flue gas
xgeneration non-catalytic reduction reacts, and reaches the effect of denitration; Wherein NO in the addition of urea and the flue gas of level V preheater (18)
xmol ratio be 1 ~ 2.5:3.
2. cement rotary kiln Dry denitration technique according to claim 1, is characterized in that: the particle diameter of described urea granules is 0.5mm ~ 2mm.
3. the equipment of cement rotary kiln Dry denitration technique described in a claim 1, comprise five-stage cyclone preheater, the level V preheater (18) of five-stage cyclone preheater is by parallel flue conjunctive decomposition kiln (19), level V preheater (18) bottom connects rotary kiln (20), it is characterized in that: insert blower pipe (10) in the parallel flue of cement kiln rotary kiln (20) kiln tail to one section of kiln upper shed of level V preheater (18) bottom of five-stage cyclone preheater, blower pipe (10) connects urea blowing device.
4. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 3, it is characterized in that: described urea blowing device comprises urea lifting subassembly, urea storage is weighed assembly, airflow blow assembly, urea lifting subassembly is the bucket elevator (2) that bottom is provided with hopper (1), urea storage assembly of weighing comprises feed bin (4) and conveying worm (5), bucket elevator (2) top is connected to feed bin (4) top by feed-line, feed bin (4) runs through and is provided with loosening device (3), conveying worm (5) is connect under feed bin (4) bottom opening, the discharging opening of conveying worm (5) is connected airflow blow assembly and is blowed urea to level V preheater (18) by blower pipe (10).
5. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 4, it is characterized in that: described loosening device (3) comprises variable frequency reducer motor (11), agitator arm (12), agitating vane (13), agitator arm (12) runs through and protrudes from feed bin (4), agitator arm (12) top is connected with variable frequency reducer motor (11), agitator arm (12) bottom is connected to feed bin (4) under shed, and agitating vane (13) is spirally wound on agitator arm (12) lower end.
6. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 4, is characterized in that: described conveying worm (5) connects variable-frequency motor.
7. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 4, it is characterized in that: described airflow blow assembly comprises air compressor (7) and venturi-type eductors (6), the gas outlet of air compressor (7) connects the air inlet of venturi-type eductors (6) by compressor reducer pipeline (9), the charging aperture of venturi-type eductors (6) connects the discharging opening of conveying worm (5), and the outlet that blows of venturi-type eductors (6) connects blower pipe (10).
8. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 7, is characterized in that: described air compressor (7) air inlet pipeline is connected with source of the gas tank.
9. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 4, is characterized in that: described feed bin (4) side is provided with observation window.
10. the equipment of a kind of cement rotary kiln Dry denitration technique according to claim 3, is characterized in that: be provided with NO in described level V preheater (18)
xcontent real-time detection apparatus, the in real time corresponding adjustment urea amount of being blown into.
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| CN111514739A (en) * | 2019-02-02 | 2020-08-11 | 广东万引科技发展有限公司 | Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system |
| CN112608049B (en) * | 2020-12-16 | 2022-08-23 | 天津水泥工业设计研究院有限公司 | Cyclic preheating low-energy-consumption carbon-enriched cement production system and method |
| CN113069909B (en) * | 2021-03-03 | 2023-03-21 | 内乡县泰隆建材有限公司 | Cement kiln denitrification facility |
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| CN102512925B (en) * | 2011-12-07 | 2014-03-12 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN103611411A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Dry denitration processing device in furnace |
| CN203971747U (en) * | 2014-07-30 | 2014-12-03 | 淄博联创环保科技有限公司 | Cement rotary kiln dry method denitration device |
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