CN104180634A - Concentrate drying system and concentrate drying method of dryer of rotary kiln - Google Patents
Concentrate drying system and concentrate drying method of dryer of rotary kiln Download PDFInfo
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- CN104180634A CN104180634A CN201310190484.6A CN201310190484A CN104180634A CN 104180634 A CN104180634 A CN 104180634A CN 201310190484 A CN201310190484 A CN 201310190484A CN 104180634 A CN104180634 A CN 104180634A
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Abstract
The invention provides a concentrate drying system and a concentrate drying method of a dryer of a rotary kiln. The system comprises a hot blast stove, the dryer of the rotary kiln, lifting plates and a high temperature smoke circulating loop, wherein the dryer of the rotary kiln comprises a kiln casing, a kiln head box and a kiln tail box, the lifting plates are uniformly and fixedly arranged on the kiln casing, and are connected with the hot blast stove, the high temperature smoke circulating loop comprises a primary cyclone dust collector, a water absorber, a hot blast return pipeline and a circulating fan, one end of the primary cyclone dust collector is connected with the kiln tail box, the other end of the primary cyclone dust collector is connected with the water absorber, one end of the circulating fan is connected with the water absorber, the other end of the circulating fan is connected with the hot blast stove, and equipment on the high temperature smoke circulating loop is connected by the hot blast return pipeline. The concentrate drying system of the dryer of the rotary kiln has the advantages that the service lives of the lifting plates can be effectively prolonged, the lifting effect of the lifting plates is enhanced, the operation rate is improved, and the energy consumption value is reduced.
Description
Technical field
The present invention relates to rotary structure technical field, particularly a kind of rotary kiln drying machine concentrate drying system and concentrate drying method thereof.
Background technology
Acid pellet is one of important method of agglomeration of fine ore.First fine ore is dried in dry kiln, then roller is milled to after suitable dynamics, adds appropriate moisture and binding agent to make the green-ball that viscosity is even, have sufficient intensity in pelletizer.Green-ball is roasting in oxidizing atmosphere after preheating, thereby makes the concurrent biochemical reaction of green-ball conglomeration make pellet, and existing pelletizing process flow chart as shown in Figure 1.Acid pellet technique is particularly suitable for processing concentrate fine powder.The pellet of output has good cold strength, reproducibility and granularity.In steel and iron industry, pellet is important blast furnace burden, can arrange in pairs or groups together with sintering deposit and form good burden structure, and Ge big steel enterprise is widely used.
When producing oxide pellet, the first step is dried fine ore exactly, and the effect quality of this step can have influence on the particularly effect of roller mill and pelletizing of a few step process flow processs below.Too much moisture can cause fine ore to stick on roller mill causing and get stuck, and can affect the moisture of producing green-ball inside, when serious, can cause cannot balling-up or the green ball strength of producing too low, cracked before entering drying grate prerequisite, bring negative effect to output and the operating rate of whole production line.Current concentrate dryer on the market can be divided into band drier, tray drier and cylinder drying machine by its structure, wherein rotary drum-type (rotary kiln) drying machine (also referred to as dry kiln) because its treating capacity is large, material strong adaptability, operating cost the is low advantage light with environmental pollution, by everybody, extensively adopted, this patent is also set forth for this class formation drying machine.
In prior art, the technological layout of rotary kiln drying system as shown in Figure 2.Described system by hot-blast stove 1, rotary kiln drying machine 2(containing kiln head box 22, kiln boot 21), cyclone dust collectors 3, secondary electric cleaner 4 and a chimney 5 forms.When producing, fine ore is entered in rotary kiln drying machine 2 by kiln boot 21, with hot blast reverse movement, finally by kiln head box 22, is discharged.The hot blast that hot-blast stove 1 produces is entered in rotary kiln drying machine 2 by kiln head box 22, with material stream reverse movement, by kiln boot 21, enter cyclone dust collectors 3 No. one time, here by the big dust particle gravitational settling carrying out in rotary kiln drying machine 2 in distinguished and admirable, enter secondary electric cleaner 4, by after granule adsorbing powder dust, finally by chimney 5, enter atmosphere again.
In prior art, as shown in Figure 3, the A-A cutaway view of Fig. 3 as shown in Figure 4 for the circumferential cutaway view of rotary kiln drying machine.Along rotary kiln drying machine circumferentially on lifting blade 8(lifting blade 8 monomer structures be 7 cabinet frame shapes, ) by a circle uniform welding on dry kiln kiln shell 7, dry kiln kiln shell 7 inner surfaces are cast with dry kiln refractory lining 6, wet stock via kiln boot 21 from drop into rotary kiln drying machine 2 one end, under in kiln, uniform lifting blade 8 stirs, material is evenly distributed and breaks up in rotary kiln drying machine 2, and fully contact with the hot-air that also flows (adverse current), thereby be heated dry, material is under the effect of the flight with angle of inclination (approximately 3 degree) and thermal current, can regulate and control to move to rotary kiln drying machine 2 another sections and discharge via kiln head box 22.Velocity of rotation by regulation and control rotary kiln drying machine 2 is accelerated the pace of (slowing down) material in kiln, thus the time length that regulation and control material contacts with hot blast.
In dry run, there are following three defects in existing concentrate rotary kiln drying machine:
1, lifting blade result of use is poor: in dry run, concentrate enters from rotary kiln drying machine kiln tail, in kiln, by lifting blade, is broken up and kicks up, and the while, finally discharges from kiln hood to contacting with hot air reverse.Because the granularity of concentrate being dried is very little and humidity is very large, in dry run, very easily stick on lifting blade, if obtain for a long time cleaning, will not form dross, not only can increase the live load of whole kiln, and the poor effect that can cause concentrate to be broken up, and then causing dry not thoroughly, heat exchange efficiency is low.
2, lifting blade is short service life: the lifting blade in dry kiln is because of its working environment extremely severe (the many dirt of high temperature); therefore often there is wearing and tearing, fracture and broken situation; and the life cycle of every lifting blade is different; tens of lifting blades in a dry kiln; if thereby frequent shutdown is given the operating rate that reduces whole production line because change lifting blade, be obviously unacceptable.
3, energy consumption is higher: the higher problem of existing concentrate drying kiln ubiquity energy consumption, find afterwards by analysis to cause the reason of this problem to have two: the one, due to easy dross on lifting blade, thereby cause lifting weak effect, concentrate contacts abundant not with hot blast, the specific area of contact is little, most of hot blast does not play the effect of Concentrate Drying but has directly discharged kiln tail, and then has reduced heat exchange efficiency and improved power consumption values; The 2nd, discharge the hot blast of rotary kiln drying machine and do not take means to be recycled, but directly emptying, caused great energy waste.
4, cause environmental pollution: existing concentrate drying system is directly discharged atmosphere by the hot blast after dedusting by chimney, during it is distinguished and admirable, contain the harmful components such as unburnt CO, NO and C, environment is had to pollution.
Therefore, research and develop that a kind of drying effect is good, power consumption values is lower, make the energy-saving and cost-reducing rotary kiln drying machine concentrate drying system of whole production line, significant.
Summary of the invention
(1) technical problem that will solve
For addressing the above problem, the object of this invention is to provide a kind of energy-saving efficient rotary kiln drying machine concentrate drying system and concentrate drying method thereof.
(2) technical scheme
The object of this invention is to provide a kind of rotary kiln drying machine concentrate drying system, described system comprises hot-blast stove, rotary kiln drying machine, described rotary kiln drying machine comprises kiln shell, kiln head box and kiln boot, described system also comprises lifting blade and high-temperature flue gas closed circuit, described lifting blade is evenly fixed on described kiln shell, is connected with hot-blast stove; Described high-temperature flue gas closed circuit comprises cyclone dust collectors, moisture absorption device, backheat air pipe line, circulating fan, and described cyclone dust collectors one end is connected with kiln boot, and the other end is connected with moisture absorption device; Described circulating fan one end is connected with moisture absorption device, and the other end is connected with hot-blast stove, in described high-temperature flue gas closed circuit, between each equipment, by backheat air pipe line, is connected.
Prior art in actual condition, the hot blast entering from rotary kiln drying machine kiln hood in kiln with material-heat-exchanging, the wind-warm syndrome of discharging kiln tail still has 200-300 ℃, and this part hot blast is not recycled, but has directly entered atmosphere after dedusting.Rotary kiln drying machine concentrate drying system of the present invention is compared with prior art, secondary electric cleaner and exhaust chimney in prior art legacy system have been cancelled, moisture absorption device, backheat air pipe line and circulating fan have been set up, make the no longer outer row of high-temperature flue gas, but get back to after dedusting dehumidifying together with supplying new wind with blower fan in hot-blast stove, as combustion-supporting gas, continue to recycle.
Rotary kiln drying machine concentrate drying system of the present invention has been cancelled chimney and secondary electric cleaner, because the present invention recycles former discharged gas fume, therefore do not need chimney.And the final hot-blast stove arriving of circulated air is not exquisite too greatly to distinguished and admirable small particles dust content, therefore can cancel secondary electric cleaner.In addition, the concentrate fine powder of being taken away by flue gas in single cycle and coal dust are transported to and in circulation, are utilized next time, reached energy-conservation effect.
Through distinguished and admirable balance and heat Balance Calculation, can obtain, when entering the new wind air quantity of hot-blast stove: during circulated air air quantity=3:1, (the 1200000 tons/year of acid pellet lines of take are example, and hot-blast stove outlet total blast volume is 12000m
3, the new wind that enters hot-blast stove is 9000m
3, circulated air is 3000m
3).System total energy consumption value is minimum, best results.
Preferably, described lifting blade is high-pressure blast cushion lifting blade, described high-pressure blast cushion lifting blade is circumferentially evenly fixed on dry kiln kiln shell along rotary kiln drying machine (also referred to as dry kiln), dry kiln kiln shell inwall upper dry kiln refractory lining, described high-pressure blast cushion lifting blade is hollow-core construction, by lifting blade box hat and the hollow wind chamber that is arranged on lifting blade inside, formed, described hollow wind chamber next-door neighbour lifting blade box hat inner surface, described lifting blade box hat is provided with spray wind hole, and described spray wind hole is arranged in more than refractory lining buries height.
From dry kiln circumferential direction, described refractory lining is buried highly for lifting blade is buried in the most significant end in refractory lining.Lifting blade is welded on dry kiln kiln shell inner surface, refractory lining (being constructed by refractory material cast-in-site) is also to build by laying bricks or stones on kiln shell inner surface simultaneously, so inevitably will bury the part of lifting blade in dry kiln circumferential lengths, and the lifting blade that exposes refractory lining is partly only and is really applied to the part of producing.Therefore spraying wind hole described in the present invention must be arranged in refractory lining and bury the above guarantee of height it is normally worked.
Preferably, in the main apparent direction of lifting blade, more than the center of circle height in minimum row's spray wind hole is buried height 20mm higher than refractory lining.If do not affecting under the prerequisite of production, minimum row's spray wind hole circle heart height should be better higher.
Preferably, rotary kiln drying machine concentrate drying system of the present invention also comprises kiln wall air feed system, described high-pressure blast cushion lifting blade is connected with hot-blast stove by kiln wall air feed system, described kiln wall air feed system comprises air-supply pipeline, tube connector, circular air inlet house steward and air intake arm, described tube connector one end is connected with hot-blast stove by air-supply pipeline, the other end is connected with circular air inlet house steward, described air intake arm is that center of circle annular is uniform along kiln circumferential direction Yi Yao center, one end of described air intake arm is connected with circular air inlet house steward, the other end inserts in kiln, be connected with the high-pressure blast cushion lifting blade of correspondence position.
Wherein, along rotary kiln drying machine, circumferentially the above high-pressure blast cushion lifting blade is by a circle uniform welding on dry kiln kiln shell, dry kiln kiln shell inner surface is cast with dry kiln refractory lining, and described high-pressure blast cushion lifting blade is connected with the air intake arm of correspondence position.
Wherein, described tube connector one end is connected with air-supply pipeline by flange, then is connected with hot-blast stove by air-supply pipeline, and the other end is connected with circular air inlet house steward.
Wherein, the distribution angle of described air intake arm and quantity are determined according to lifting blade distribution situation in kiln.
According to the difference of present position on rotary kiln drying machine, described kiln wall air feed system can be divided into head kiln wall air feed system, middle part kiln wall air feed system and three parts of afterbody kiln wall air feed system along rotary kiln drying machine axial direction.When concentrate just enters in kiln from kiln tail, its humidity is maximum, the most easy dross on lifting blade, therefore the air quantity that this part is supplied with should be maximum, secondly, head air quantity is minimum for middle part air quantity, and concrete air quantity ratio can regulate according to on-site actual situations.
Wherein, from hot-blast stove hot blast out along air-supply pipeline, enter kiln wall air feed system.HTHP wind (hot blast) in air intake arm enters from the inner hollow wind chamber of high-pressure blast cushion lifting blade; and sprayed in kiln by the spray wind hole being arranged on lifting blade box hat; at lifting blade outer surface, form one deck wind pad; play the effect of protection lifting blade and strengthening material scattering effect, changed in prior art hot blast by the mode of kiln hood air intake.
If not otherwise specified, the connection of each structure of rotary kiln drying machine concentrate drying system of the present invention all connects by air-supply pipeline, establishes many places and diffuses a little, to guarantee the distinguished and admirable balance in air-supply pipeline on air-supply pipeline.
Further preferably, rotary kiln drying machine concentrate drying system of the present invention also comprises flow detection and control device, on air-supply pipeline, be provided with flow control valve and flow detector, can be according to the real-time traffic adjusting control valve aperture detecting when system is moved, thus guarantee that distinguished and admirable value is distributed rationally everywhere.
In the work progress of rotary kiln drying machine (also referred to as dry kiln) and lifting blade, dry kiln kiln shell is in the necessary perforate in the relevant position of installation high-voltage wind cushion lifting blade, so that air intake arm is communicated with the hollow wind chamber of lifting blade, make hot blast can enter smoothly lifting blade inside.Simultaneously; must use the on-the-spot formwork method construction of ramming mass dry kiln refractory lining; from certain, start construction; constructed after one section; turn an angle and continue next section of refractory lining of construction; repeat successively, until complete the construction of whole circle refractory lining, to protect the spray wind hole of lifting blade not enter the powder of resistance to material.
The present invention also provides a kind of concentrate drying method based on described rotary kiln drying machine concentrate drying system.
While using rotary kiln drying machine concentrate drying system of the present invention to produce, the hot blast producing in hot-blast stove enters kiln wall air feed system along air-supply pipeline, on air-supply pipeline, be provided with flow control valve and flow detector, according to the real-time traffic adjusting control valve aperture detecting, guarantee that distinguished and admirable value is distributed rationally everywhere.First hot blast enters tube connector, then enters circular air inlet house steward, then enters the hollow wind chamber of air intake arm and high-pressure blast cushion lifting blade inside, finally from the spray wind hole being arranged in lifting blade box hat, sprays in kiln.Affected by the negative pressure of circulating fan, hot blast in kiln will leave rotary kiln drying machine from kiln boot, subsequently along backheat air pipe line respectively through cyclone dust collectors, moisture absorption device and a circulating fan, finally get back in hot-blast stove, complete once distinguished and admirable cyclic process.In rotary kiln drying machine, material flows away to for to enter rotary kiln drying machine from kiln boot simultaneously, in kiln, with distinguished and admirable reverse contact, finally from kiln head box, discharges.
(3) beneficial effect
Rotary kiln drying machine concentrate drying system tool of the present invention has the following advantages:
(1) the high-pressure blast cushion lifting blade result of use of rotary kiln drying machine concentrate drying system of the present invention is good: due to the spray wind hole of the ejection high-pressure blast that gathered on lifting blade, therefore even fine ore sticks on lifting blade in dry run, thereby also can by high-pressure blast very first time of blowing off, be removed because of it, eliminated it because do not obtain the hidden danger that cleaning forms dross for a long time, and then guaranteed that lifting blade breaks up the effect of concentrate, make to be dried thoroughly, heat exchange efficiency is high.
(2) the high-pressure blast cushion lifting blade long service life of rotary kiln drying machine concentrate drying system of the present invention: the high-pressure blast spraying due to spray wind hole forms one deck wind pad on lifting blade surface; therefore effectively protected lifting blade; reduced its when actual production because directly contact the wearing and tearing that occur, fracture and broken situation with fine ore; thereby greatly extended the service life of lifting blade, and then improved the operating rate of whole dry kiln system.
(3) value capable of reducing energy consumption: rotary kiln drying machine concentrate drying system of the present invention is again circulated to the hot blast of discharging rotary kiln drying machine in hot-blast stove and is recycled after dedusting dehumidifying, the prior art of comparing directly emptying, save the energy, reduced power consumption values.The acid pellet production line of 1,200,000 tons/year of take is example, and the hot blast rate outside discharge dry kiln per hour is 12000m
3according to 200 ℃ of calculations of wind-warm syndrome, the heat enthalpy value of outer air draft per hour is 816000 kilocalories (not comprising the contained chemical heat of material such as unburnt CO, C in flue gas), according to utilization ratio 70%, calculate, new departure system that can be per hour is saved the energy of approximately 571200 kilocalories, amounts to approximately 85 kilograms, bituminous coal.
(4) can reduce environmental pollution: prior art is directly discharged atmosphere by the hot blast after dedusting by chimney, during it is distinguished and admirable, contain the harmful components such as unburnt CO, NO and C, environment is had to pollution.The present invention recycles distinguished and admirable in comparison, has avoided the pollution of efflux gas to environment, has effectively protected atmospheric environment.
(5) use rotary kiln drying machine concentrate drying system of the present invention, can effectively extend the service life of lifting blade, the lifting effect of strengthening lifting blade, value capable of reducing energy consumption also when improving operating rate.Compare with existing drying system, more energy-conservation, economic, reliable and environmental protection, can predict it has great potential in future market.
Accompanying drawing explanation
Fig. 1 is existing pelletizing process flow chart;
Fig. 2 is the technological layout of prior art rotary kiln drying system;
Fig. 3 is the circumferential cutaway view of prior art rotary kiln drying machine;
Fig. 4 is the A-A cutaway view of Fig. 3;
Fig. 5 is the technological layout of the rotary kiln drying machine concentrate drying system of the embodiment of the present invention;
Fig. 6 is the front view of rotary kiln drying machine in the embodiment of the present invention;
Fig. 7 is that the B of Fig. 6 is to view;
Fig. 8 is the C-C cutaway view of Fig. 6;
Fig. 9 is the D place enlarged drawing of Fig. 8;
Figure 10 is that in the embodiment of the present invention, refractory lining is buried high-level schematic;
Figure 11 is the circumferential cutaway view of the rotary kiln drying machine of the refractory lining of not constructing;
Figure 12 is the circumferential cutaway view of the rotary kiln drying machine of the first paragraph refractory lining of having constructed;
Figure 13 is the circumferential cutaway view of the rotary kiln drying machine of the second segment refractory lining of having constructed;
In figure: 1 is hot-blast stove; 2 is rotary kiln drying machine; 21 is kiln boot; 22 is kiln head box; 3 is cyclone dust collectors; 4 is secondary electric cleaner; 5 is chimney; 6 is dry kiln refractory lining; 7 is dry kiln kiln shell; 8 is lifting blade; 81 is lifting blade box hat; 82 is hollow wind chamber; 83 is spray wind hole; 9 is tube connector; 10 is air intake arm; 11 is circular air inlet house steward; 12 is moisture absorption device; 13 is backheat air pipe line; 14 is circulating fan; 15 is flow detector; 16 is flow control valve; 17 is air-supply pipeline; 18 for refractory lining bury height; 61 is first paragraph refractory lining; 62 is second segment refractory lining.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
In description of the invention, it should be noted that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. are only for describing object, and can not be interpreted as indication or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
In addition,, in description of the invention, except as otherwise noted, the implication of " a plurality of ", " many ", " many groups " is two or more.
As shown in Fig. 5-8, the rotary kiln drying machine concentrate drying system of the present embodiment comprises hot-blast stove 1, rotary kiln drying machine 2, described rotary kiln drying machine 2 comprises kiln shell 7, kiln head box 22 and kiln boot 21, described system also comprises high-pressure blast cushion lifting blade 8 and high-temperature flue gas closed circuit, described high-pressure blast cushion lifting blade 8 is evenly fixed on described kiln shell 7, is connected with hot-blast stove 1; Described high-temperature flue gas closed circuit comprises cyclone dust collectors 3, moisture absorption device 12, backheat air pipe line 13, circulating fan 14, and described cyclone dust collectors 3 one end are connected with kiln boot 21, and the other end is connected with moisture absorption device 12; Described circulating fan 14 one end are connected with moisture absorption device 12, and the other end is connected with hot-blast stove 1, in described high-temperature flue gas closed circuit, between each equipment, by backheat air pipe line 13, are connected.
Prior art in actual condition, the hot blast entering from rotary kiln drying machine kiln hood in kiln with material-heat-exchanging, the wind-warm syndrome of discharging kiln tail still has 200 ℃, and this part hot blast is not recycled, but has directly entered atmosphere after dedusting.The rotary kiln drying machine concentrate drying system of the present embodiment is compared with prior art, secondary electric cleaner and exhaust chimney in prior art legacy system have been cancelled, moisture absorption device 12, backheat air pipe line 13 and circulating fan 14 have been set up, make the no longer outer row of high-temperature flue gas, but get back to after dedusting dehumidifying together with supplying new wind with blower fan in hot-blast stove 1, as combustion-supporting gas, continue to recycle.
The rotary kiln drying machine concentrate drying system of the present embodiment has been cancelled chimney and secondary electric cleaner, because the embodiment of the present invention recycles former discharged gas fume, therefore do not need chimney.And the final hot-blast stove arriving of circulated air is not exquisite too greatly to distinguished and admirable small particles dust content, therefore can cancel secondary electric cleaner.In addition, the concentrate fine powder of being taken away by flue gas in single cycle and coal dust are transported to and in circulation, are utilized next time, reached energy-conservation effect.
Through distinguished and admirable balance and heat Balance Calculation, can obtain, when entering the new wind air quantity of hot-blast stove: during circulated air air quantity=3:1, (the 1200000 tons/year of acid pellet lines of take are example, and hot-blast stove outlet total blast volume is 12000m
3, the new wind that enters hot-blast stove is 9000m
3, circulated air is 3000m
3).System total energy consumption value is minimum, best results.
As Figure 8-9, described high-pressure blast cushion lifting blade 8 is circumferentially evenly fixed on dry kiln kiln shell 7 along rotary kiln drying machine, dry kiln kiln shell 7 inwall upper dry kiln refractory linings 6, described high-pressure blast cushion lifting blade 8 is hollow-core construction, by lifting blade box hat 81 and the hollow wind chamber 82 that is arranged on lifting blade 8 inside, formed, described hollow wind chamber 82 next-door neighbour's lifting blade box hat 81 inner surfaces, described lifting blade box hat 81 is provided with spray wind hole 83, and described spray wind hole 83 is arranged in refractory lining and buries height more than 18.
As shown in figure 10, from dry kiln circumferential direction, it is the most significant end that lifting blade 8 is buried in 6 li of refractory linings that described refractory lining is buried height 18.Lifting blade 8 is welded on dry kiln kiln shell 7 inner surfaces, refractory lining 6(is constructed by refractory material cast-in-site simultaneously) be also to build by laying bricks or stones on kiln shell 7 inner surfaces, so inevitably will bury the part of lifting blade 8 in dry kiln circumferential lengths, and lifting blade 8 parts of exposing refractory lining 6 are only and are really applied to the part of producing.Therefore described in the present invention, spray wind hole 83 must be arranged in refractory lining bury height 18 above guarantees its normally work.
Preferably, in the main apparent direction of lifting blade 8, the center of circle aspect ratio refractory lining in a minimum row spray wind hole 83 is buried more than height 18 exceeds 20mm.If do not affecting under the prerequisite of production, minimum row's spray wind hole 83 center of circle height should be better higher.
As shown in Fig. 5-8, the rotary kiln drying machine concentrate drying system of the embodiment of the present invention also comprises kiln wall air feed system, described high-pressure blast cushion lifting blade 8 is connected with hot-blast stove 1 by kiln wall air feed system, described kiln wall air feed system comprises air-supply pipeline 17, for airduct 9, circular air inlet house steward 11 and air intake arm 10, described tube connector 9 one end are connected with hot-blast stove 1 by air-supply pipeline 17, the other end is connected with circular air inlet house steward 11, described air intake arm 10 is that center of circle annular is uniform along kiln circumferential direction Yi Yao center, one end of described air intake arm 10 is connected with circular air inlet house steward 11, the other end inserts in kiln, be connected with the high-pressure blast cushion lifting blade 8 of correspondence position.
Wherein, along circumferential the above the high-pressure blast cushion lifting blade 8 of rotary kiln drying machine 2 by a circle uniform welding on dry kiln kiln shell 7, dry kiln kiln shell 7 inner surfaces are cast with dry kiln refractory lining 6, and described high-pressure blast cushion lifting blade 8 is connected with the air intake arm 10 of correspondence position.
Wherein, described tube connector 9 one end are connected with air-supply pipeline 17 by flange, then are connected with hot-blast stove 1 by air-supply pipeline 17, and the other end is connected with circular air inlet house steward 11.
Wherein, the distribution angle of described air intake arm 10 and quantity are determined according to 8 distribution situations of lifting blade in kiln.
According to the difference of present position on rotary kiln drying machine, described kiln wall air feed system can be divided into head kiln wall air feed system, middle part kiln wall air feed system and three parts of afterbody kiln wall air feed system along rotary kiln drying machine axial direction.When concentrate just enters in kiln from kiln tail, its humidity is maximum, the most easy dross on lifting blade, therefore the air quantity that this part is supplied with should be maximum, secondly, head air quantity is minimum for middle part air quantity, and concrete air quantity ratio can regulate according to on-site actual situations.
Wherein, as shown in Fig. 5-9, from hot-blast stove hot blast out along air-supply pipeline 17, enter kiln wall air feed system.HTHP wind (hot blast) in air intake arm 10 enters from the hollow wind chamber of high-pressure blast cushion lifting blade 8; and sprayed in kiln by 83 places, spray wind hole that are arranged on lifting blade box hat 81; at lifting blade 8 outer surfaces, form one deck wind pad; play the effect of protection lifting blade 8 and strengthening material scattering effect, changed in prior art hot blast by the mode of kiln hood air intake.
If not otherwise specified, the connection of each structure of the rotary kiln drying machine concentrate drying system of the embodiment of the present invention all connects by air-supply pipeline 17, establishes many places and diffuses a little, to guarantee the distinguished and admirable balance in air-supply pipeline 17 on air-supply pipeline 17.
Further preferably, as shown in Figure 5, the rotary kiln drying machine concentrate drying system of the embodiment of the present invention also comprises flow detection and control device, on air-supply pipeline 17, be provided with flow control valve 16 and flow detector 15, can be according to the real-time traffic adjusting control valve aperture detecting when system is moved, thus guarantee that distinguished and admirable value is distributed rationally everywhere.
At rotary kiln drying machine 2(also referred to as dry kiln) and the work progress of high-pressure blast cushion lifting blade 8 in, dry kiln kiln shell 7 is in the necessary perforate in the relevant position that lifting blade 8 is installed, so that air intake arm 10 is communicated with the hollow wind chamber 82 of lifting blade 8, make hot blast can enter smoothly lifting blade 8 inside.
As shown in Figure 11-13; arrow represents rotation direction; must use the on-the-spot formwork method construction of ramming mass dry kiln refractory lining 6; from certain, start construction; constructed after first paragraph refractory lining 61, turned an angle and continue construction second segment refractory lining 62, repeated successively; until complete the construction of whole circle refractory lining 6, to protect the spray wind hole 83 of lifting blade 8 not enter the powder of resistance to material.
When the rotary kiln drying machine concentrate drying system of the use embodiment of the present invention is produced, hot blast in hot-blast stove 1 interior generation enters kiln wall air feed system along air-supply pipeline 17, on air-supply pipeline 17, be provided with flow control valve 16 and flow detector 15, according to the real-time traffic adjusting control valve aperture detecting, guarantee that distinguished and admirable value is distributed rationally everywhere.First hot blast enters tube connector 9, then enters circular air inlet house steward 11, then enters the hollow wind chamber 82 of air intake arm 10 and lifting blade 8 inside, finally from the spray wind hole 83 being arranged in lifting blade box hat 81, sprays in kiln.Affected by the negative pressure of circulating fan 14, hot blast in kiln will leave rotary kiln drying machine 2 from kiln boot 21, subsequently along backheat air pipe line 13 respectively through cyclone dust collectors 3, moisture absorption device 12 and circulating fan 14, finally get back in hot-blast stove 1, complete once distinguished and admirable cyclic process.Rotary kiln drying machine 2 interior material flow away to for to enter rotary kiln drying machine 2 from kiln boot 21 simultaneously, in kiln, with distinguished and admirable reverse contact, finally from kiln head box 22, discharge.
Use rotary kiln drying machine concentrate drying system of the present invention, can effectively extend the service life of lifting blade, the lifting effect of strengthening lifting blade, value capable of reducing energy consumption also when improving operating rate.Compare with existing drying system, more energy-conservation, economic, reliable and environmental protection, can predict it has great potential in future market.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (8)
1. a rotary kiln drying machine concentrate drying system, described system comprises hot-blast stove, rotary kiln drying machine, described rotary kiln drying machine comprises kiln shell, kiln head box and kiln boot, it is characterized in that, described system also comprises lifting blade and high-temperature flue gas closed circuit, described lifting blade is evenly fixed on described kiln shell, is connected with hot-blast stove; Described high-temperature flue gas closed circuit comprises cyclone dust collectors, moisture absorption device, backheat air pipe line, circulating fan, and described cyclone dust collectors one end is connected with kiln boot, and the other end is connected with moisture absorption device; Described circulating fan one end is connected with moisture absorption device, and the other end is connected with hot-blast stove, in described high-temperature flue gas closed circuit, between each equipment, by backheat air pipe line, is connected.
2. system according to claim 1, it is characterized in that, described lifting blade is high-pressure blast cushion lifting blade, described high-pressure blast cushion lifting blade is circumferentially evenly fixed on kiln shell along rotary kiln drying machine, kiln shell inwall upper dry kiln refractory lining, described high-pressure blast cushion lifting blade is hollow-core construction, by lifting blade box hat and the hollow wind chamber that is arranged on lifting blade inside, formed, described hollow wind chamber next-door neighbour lifting blade box hat inner surface, described lifting blade box hat is provided with spray wind hole, and described spray wind hole is arranged in more than refractory lining buries height.
3. system according to claim 1 and 2, is characterized in that, enters the new wind air quantity of hot-blast stove and the ratio of circulated air air quantity is 3:1.
4. system according to claim 2, it is characterized in that, described rotary kiln drying machine concentrate drying system also comprises kiln wall air feed system, described high-pressure blast cushion lifting blade is connected with hot-blast stove by kiln wall air feed system, described kiln wall air feed system comprises air-supply pipeline, tube connector, circular air inlet house steward and air intake arm, described tube connector one end is connected with hot-blast stove by air-supply pipeline, the other end is connected with circular air inlet house steward, described air intake arm is that center of circle annular is uniform along kiln circumferential direction Yi Yao center, one end of described air intake arm is connected with circular air inlet house steward, the other end inserts in kiln, be connected with the high-pressure blast cushion lifting blade of correspondence position.
5. system according to claim 4, is characterized in that, described kiln wall air feed system along rotary kiln drying machine axial direction is being head kiln wall air feed system, middle part kiln wall air feed system or afterbody kiln wall air feed system.
6. system according to claim 4, is characterized in that, described rotary kiln drying machine concentrate drying system also comprises flow detection and control device, is provided with flow control valve and flow detector on air-supply pipeline.
7. the concentrate drying method based on rotary kiln drying machine concentrate drying system described in claim 1-6 any one.
8. the concentrate drying method based on rotary kiln drying machine concentrate drying system described in claim 6, it is characterized in that, described method is: the hot blast producing in hot-blast stove enters kiln wall air feed system along air-supply pipeline, regulate again and control flow control valve and the flow detector that air-supply pipeline is provided with, first hot blast enters tube connector, then enter circular air inlet house steward, then enter the inner hollow wind chamber of air intake arm and high-pressure blast cushion lifting blade, finally from the spray wind hole being arranged in lifting blade box hat, spray in kiln, hot blast leaves rotary kiln drying machine from kiln boot, again along backheat air pipe line respectively through cyclone dust collectors, moisture absorption device and circulating fan, finally get back in hot-blast stove, complete once distinguished and admirable cyclic process, in rotary kiln drying machine, material flows away to for to enter rotary kiln drying machine from kiln boot simultaneously, in kiln, with distinguished and admirable reverse contact, finally from kiln head box, discharges.
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| CN109751847A (en) * | 2017-11-07 | 2019-05-14 | 丹阳市宏光机械有限公司 | A kind of revolving drier |
| CN110849104A (en) * | 2019-11-20 | 2020-02-28 | 攀枝花钢城集团瑞通制冷设备有限公司 | Mineral powder drying device |
| CN113154396A (en) * | 2021-04-16 | 2021-07-23 | 中冶长天国际工程有限责任公司 | Solid waste, sintering and pellet cooperative treatment process based on reasonable water control |
| CN113932596A (en) * | 2021-10-22 | 2022-01-14 | 中冶长天国际工程有限责任公司 | Lump ore drying device and drying method |
| CN113970105A (en) * | 2020-07-22 | 2022-01-25 | 中冶长天国际工程有限责任公司 | Hazardous waste incineration system and hazardous waste incineration method based on air inlet of lifting plate |
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| CN104180634B (en) | 2016-08-10 |
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