CN106986561A - Annular lime shaft kiln - Google Patents
Annular lime shaft kiln Download PDFInfo
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- CN106986561A CN106986561A CN201710346004.9A CN201710346004A CN106986561A CN 106986561 A CN106986561 A CN 106986561A CN 201710346004 A CN201710346004 A CN 201710346004A CN 106986561 A CN106986561 A CN 106986561A
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- inner cylinder
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- combustion chamber
- cooling air
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The present invention provides a kind of annular lime shaft kiln, including kiln body, distributing device, multiple upper lower combustion chamber, multiple burners up and down, multiple arch bridge, cooling air systems etc. up and down, wherein kiln body has arranged concentric and interval is formed with the inner cylinder and outer barrel of circular passage, and distributing device is located at the upper end of circular passage；Cooling air system includes inner cylinder cooling air system and bed of material cooling air system, inner cylinder cooling air system is arranged so that cooling wind is flowed into from the bottom of inner cylinder, top is flowed out for cooling down inner cylinder and being passed through upper burner as its combustion air, and the bed of material after bed of material cooling air system is arranged so as to cool down wind to being calcined in circular passage is cooled down and provides combustion air for lower burner；Its annular passage is configured to preheating zone, top adverse current burning zone, middle part adverse current burning zone, bottom without the quenched band of stream and cooling zone from top to bottom.It is small that the present invention can stably produce high-quality active lime, combustion gas strong adaptability, environmental pollution.
Description
Technical field：
The present invention relates to a kind of Industrial Stoves of calcined limestone, more particularly to a kind of annular lime shaft kiln.
Background technology：
Currently used for the shaft furnace of lime burning, mainly including annular lime kiln, double thorax kilns, twin beams kiln and mechanized cement shaft kiln etc..
The common feature of double thorax kilns, twin beams kiln and mechanized cement shaft kiln is：There is no independent combustion space, the burning of fuel exists
Carried out in the bed of material.This combustion system further has influence on：First, in order to cause fuel to be burnt in the bed of material fully as far as possible,
Larger coefficient of excess air must be used, causes the increase of meaningless combustion product, correspondingly increases the meaningless heat consumption of system；
Second, the combination order of primary air, auxiliary air and fuel in the bed of material is poor, in order to reach the lime stone point of burning zone
Necessary temp needed for solution, it is desirable to which the calorific value of fuel is higher；3rd, or when fuel is relatively low, due to primary air, secondary sky
The combination order of gas and fuel in the bed of material is poor, and burning zone ignition temperature is relatively low, must in order to reach the degree of calcination of requirement
Material must be increased in the residence time of burning zone, that is, mean the calcination space usage factor reduction of kiln, it is impossible to reach design production
Amount.
Maximum of the annular lime kiln in burning be characterized in：It is provided with upper and lower two layers independent combustion space；In lower burning
Room, at least two kinds combustion airs participate in burning：Lime cooling air and driving air, supplement burner combustion air if necessary,
The angle of collateral security basic technology, even if only lime cooling air and driving air participates in burning, lower combustion chamber has reached very
High coefficient of excess air；In upper combustion chamber, normally only burner combustion air participation is burnt, from the angle of control ignition temperature,
Oxygen debt burning is generally in upper combustion chamber, remaining unburned fuel rises oxygen unnecessary in flue gas with lower combustion chamber and combined, and
Continue the bed of material burning near upper combustion chamber.So：For exotic fuels, fuel burns degree pole in upper combustion chamber
Low, calorific value is higher, and the degree that burns is lower, and certainly will so having substantial amounts of fuel to enter upper combustion chamber, nearby the bed of material burns away, as before
Described, the mode of burning can not ensure fully burning for fuel in the bed of material.For low calorie fuels, on the one hand, due to lower burning
Room very high coefficient of excess air in itself, the flue-gas temperature after burning be difficult to reach material decompose needed for temperature；On the other hand,
The preferable ignition temperature of upper combustion chamber certainly will be realized by improving air coefficient in upper combustion chamber, although now in upper combustion chamber
The degree that burns of fuel is improved, but the air coefficient of whole sleeve kiln will become high.
In a word, for the shaft furnace currently used for lime burning, there is problem includes：
First, fuel value requires higher, and double thorax kilns, twin beams kiln and mechanized cement shaft kiln are typically required in more than 6690kJ/Nm3,
Annular lime kiln is typically required in 5020kJ/Nm3More than.
Second, or when fuel value is relatively low, production operation must drop in kiln, while the raw burn rate of material will substantially increase.
3rd, the air coefficient of double thorax kilns, twin beams kiln and mechanized cement shaft kiln is higher, and double thorax kilns, twin beams kiln and mechanization are vertical
Kiln is general more than 1.4, it is meant that meaningless heat consumption is higher.
4th, for sleeve kiln：When taking exotic fuels, air coefficient is relatively low, but the burnout rate drop of fuel simultaneously
It is low；When taking low calorie fuels, air coefficient is higher.There is the problem of meaningless heat consumption is high in a word.
The content of the invention：
To overcome above mentioned problem, the present invention, which provides one kind, can stably produce high-quality active lime and combustion gas adaptability
By force, the small annular lime shaft kiln of environmental pollution will be favourable.
Therefore, the present invention provides a kind of annular lime shaft kiln, it includes：
Kiln body, it has the inner cylinder and outer barrel of arranged concentric, circular passage is formed between inner cylinder and outer barrel；
Distributing device, it is installed in circular passage upper end；
Multiple upper combustion chamber and multiple lower combustion chamber, it is spaced apart above and below excircle along outer barrel；
Multiple upper burners and multiple lower burners, it is installed in multiple upper combustion chamber and multiple lower combustion chamber respectively correspondingly
On；
Multiple upper arch bridges and multiple lower arch bridges, its be located between outer barrel and inner cylinder be used for correspondingly by multiple upper combustion chamber and
Multiple lower combustion chamber are connected with inner cylinder respectively；
Inner cylinder cooling air system, it include inner cylinder cooling wind inlet pipe and on inner cylinder it is many correspondingly with multiple upper burners
Individual inner cylinder cooling air outlet, and be arranged so as to cool down bottom inflow, top outflow of the wind from inner cylinder；
Bed of material cooling air system, it include the bed of material cooling wind inlet pipe and on outer barrel it is many correspondingly with multiple lower burners
Individual bed of material cooling air outlet, and it is arranged so that cool down wind cools down to the bed of material after being calcined in circular passage；
Wherein, above-mentioned circular passage is configured to preheating zone between being located at the top of distributing device and inner cylinder, positioned at inner cylinder from top to bottom
Top adverse current burning zone between top and multiple upper combustion chamber, between multiple upper combustion chamber and multiple lower combustion chamber in
Portion's adverse current burning zone, the bottom between multiple lower combustion chamber and multiple bed of material cooling air outlets are without the quenched band of stream, Yi Jiwei
Cooling zone below multiple bed of material cooling air outlets.
In the present invention, calcined and quenched without flowing due to adverse current can be completed simultaneously in the space of circular passage, therefore energy
Stably produce high-quality active lime；
Due to eliminating the labyrinths such as heat exchanger of the prior art, injector, and add without the quenched band of stream, so that
Burning of the fuel in combustion chamber is more easy to control, therefore stronger to the adaptability of combustion gas, and reduces investment cost and reduce
Equipment failure rate；Due to the setting of inner cylinder cooling air system and bed of material cooling air system so that exhaust gas temperature is relatively low, thus in cigarette
Gas need not be blended into cold wind when being discharged into air advance deduster, this aspect reduces power consumption, on the other hand can reduce deduster
Interior filtration velocity, further extends the service life of cloth bag and ensures efficiency of dust collection.
Further, above-mentioned inner cylinder cooling air system also includes at least one inner cylinder cooling blower, multiple inner cylinders cooling wind branch
Pipe and an inner cylinder cooling vane pipe, wherein, inner cylinder cooling blower and above-mentioned inner cylinder cooling wind inlet pipe are connected, and be used for will be cold
But wind is sent into above-mentioned inner cylinder, and one end of multiple inner cylinder cooling wind branch pipes is connected to above-mentioned multiple inner cylinder cooling wind correspondingly
Outlet, the other end is all communicated on inner cylinder cooling vane pipe, and the inner cylinder cooling vane pipe is connected with above-mentioned multiple upper burners to be thought
It provides combustion air.
Due to said structure so that own temperature is preheated into 200 DEG C or so of cooling wind again while inner cylinder is cooled down
Go to participate in the combustion-supporting of burner, so take full advantage of waste heat, reduce energy consumption.
Further, above-mentioned multiple bed of material cooling air outlets are connected to multiple bed of material cooling air outlet branch correspondingly
Pipe, above-mentioned bed of material cooling air system also includes multiple bed of material cooling blowers, and the plurality of bed of material cooling blower and the plurality of bed of material are cold
But wind outlet stool corresponds and is used to the cooling wind after heat exchange in above-mentioned cooling zone being drawn into multiple bed of material cooling wind
In outlet stool, the plurality of bed of material cooling air outlet branch pipe connects with above-mentioned multiple lower burners helped with being provided for it correspondingly
Fire air.
Set by said structure, cooling wind can carry out temperature after heat exchange with calcine and improve to 400 DEG C or so, so
Afterwards combustion air of the wind extraction as lower burner will be cooled down by bed of material cooling blower after preheating, and calcine is passed through
Can be reduced to by cooling down temperature after the cooling of wind by 100 DEG C or so, so taken full advantage of waste heat, reduced energy consumption.
Further, in addition to for the main smoke discharging blower fan system from the outside drawing smoke in above-mentioned preheating zone, the main smoke evacuation
Blower fan system include being located at flue gas pump orifice at the top of above-mentioned outer barrel, the smoke settlement pipe that is connected with flue gas pump orifice and with
The main smoke discharging blower fan of smoke settlement pipe connection, wherein, on main smoke discharging blower fan and above-mentioned multiple bed of material cooling blowers are arranged so that
The negative pressure stated in multiple lower combustion chamber is consistent with the negative pressure at above-mentioned multiple bed of material cooling air outlets, so that in above-mentioned bottom without stream
Airless flows in quenched band.
Due to said structure, higher lime stone continues downwards to bottom degree of calcination after the adverse current burning zone of middle part
During without flowing quenched band, although no flue gas continues heat supply to it, but material contained heat in itself is relied on, continuing as material and entering
Row, which relaxes, to be decomposed and quenched creation time and steric requirements, so as to stably produce high-quality active lime.
Again further, above-mentioned multiple upper combustion chamber and above-mentioned multiple lower combustion chamber are arranged to combustion gas and above-mentioned combustion air
Fully burning in it.
By above-mentioned setting, it may be such that fuel realizes burning completely in combustion chamber, the burnout rate of fuel is greatly improved,
The waste of fuel is not resulted in；Further, since cold air is participated in after the cooling to inner cylinder and the bed of material is completed by burner
The burning of combustion chamber, thus do not have to concern combustion chamber can because clean-burning high temperature and caused by combustion chamber and the resistance to material of arch bridge
Influence.
Again further, when above-mentioned combustion gas is blast furnace gas, excess air coefficient is controlled in 1.05-1.2.
By above-mentioned setting, it may be such that blast furnace gas and air fully burn in combustion chamber, certainly, excess air coefficient
It is slightly different according to the calorific value of combustion gas, i.e. the control of excess air coefficient can be carried out slightly according to the species for the combustion gas for participating in burning
Change, to ensure clean-burning effect.
Further, above-mentioned multiple upper combustion chamber and above-mentioned multiple lower combustion chamber use fuel/air mixture fractional combustion mode,
And/or above-mentioned multiple upper burners and above-mentioned multiple lower burners all use low NOx burner.
Said structure can greatly reduce NOx emission index.For example, when using low NOx burner, in combustion chamber
Local smoke backflow area can be formed, the oxygen concentration of combustion space is reduced, and creates NOx reducing condition, so as to inhibit
Thermal NO x generation, therefore, the discharge that the present invention is capable of strict guarantee NOx are far below 100mg/Nm3（With NO2Meter）.
Further, in addition to ash discharge platform and multiple ash hoists on ash discharge platform, the above-mentioned bed of material cools down wind inlet
Pipe is arranged at ash discharge mesa base and is sucked outside air in above-mentioned kiln body using the negative pressure in above-mentioned kiln body.
Further, multiple cutting plates in addition to above above-mentioned ash hoist, wherein, above-mentioned multiple upper arch bridges with it is above-mentioned
It is dislocation arrangement between multiple lower arch bridges, between above-mentioned multiple lower arch bridges and above-mentioned multiple cutting plates.
Pass through the arrangement that misplaces so that during material is moved from top to down in circular passage, repeatedly at a certain angle
Lateral reallocation, that is, carry out secondary material distributing, material is more evenly distributed, improve material degree of being heated evenly.
Further, for same seat ring shape lime shaft kiln, above-mentioned multiple quantity is the same numeral more than or equal to 4,
And it is all evenly distributed in the circumferential direction.
By multiple upper combustion chamber on the annular lime shaft kiln of the present invention, multiple lower combustion chamber, multiple upper burners, multiple
Lower burner, multiple upper arch bridges, multiple lower arch bridges, multiple inner cylinder cooling air outlets, multiple bed of material cooling air outlets, multiple ash discharges
Machine, multiple cutting plates, etc. so that either cloth, flue gas or cooling wind can be evenly distributed in a circumferential direction.
By reference to the embodiments described below, above-mentioned these and other aspects of the invention will obtain more clear
Illustrate clearly.
Brief description of the drawings：
The structure of invention and further objects and advantages will be better understood by description below in conjunction with the accompanying drawings, its
In, identical reference marker mark identical element：
Fig. 1 is the structural representation of the annular lime shaft kiln according to the specific embodiment of the present invention.
Description of reference numerals：
The inner cylinder of 1 kiln body 10
The circular passage of 12 outer barrel 2
The top adverse current burning zone of 21 preheating zone 23
The bottom of 25 middle part adverse current burning zone 27 is without the quenched band of stream
The distributing device of 28 cooling zone 3
Burner in 40 upper combustion chamber 41
42 burners of lower combustion chamber 43 times
52 times arch bridges of arch bridge on 50
The inner cylinder cooling air outlet of 60 inner cylinders cooling wind inlet pipe 62
The inner cylinder cooling vane pipe of 64 inner cylinders cooling wind branch pipe 66
The bed of material cooling air outlet of 70 bed of materials cooling wind inlet pipe 72
The bed of material cooling blower of 74 bed of material cooling air outlet branch pipe 76
The ash hoist of 8 ash discharge platform 81
Embodiment：
The embodiment of the present invention is described below in conjunction with accompanying drawing.
Fig. 1 shows the annular lime shaft kiln according to the specific embodiment of the present invention.In the present embodiment, ring
Shape lime shaft kiln includes kiln body, distributing device, combustion chamber, burner, arch bridge, cooling air system etc., wherein, kiln body 1 has concentric cloth
The inner cylinder 10 and outer barrel 12 put, are formed with circular passage 2 between inner cylinder 10 and outer barrel 12；Distributing device 3 is installed in circular passage 2
Upper end；Combustion chamber includes 9 upper combustion chamber 40 and 9 lower combustion chamber 42, and upper combustion chamber 40 and lower combustion chamber 42 are along outer barrel 2
It is spaced apart above and below excircle, and 9 upper combustion chamber 40 are uniformly distributed in a circumferential direction, and 9 lower combustion chamber 42 are also in circle
It is uniformly distributed in circumferential direction；Burner includes 9 upper burners 41 and 9 lower burners 43, and they are installed in 9 correspondingly respectively
In upper combustion chamber 40 and 9 lower combustion chamber 42；Arch bridge includes 9 upper arch bridges 50 and 9 lower arch bridges 52, and they are located at the He of outer barrel 12
Between inner cylinder 10, for 9 upper combustion chamber 40 and 9 lower combustion chamber 42 to be connected with inner cylinder 10 respectively correspondingly.
Although it should be noted that the structure such as upper combustion chamber, lower combustion chamber is all 9 in the present embodiment, and unexpectedly
Taste that the numeral is immutable, in fact, the quantity of these structures is come fixed according to the yield of annular lime shaft kiln, for example,
When yield is of a relatively high, the quantity of these structures can be designed as 9, and yield is slightly lower, it can also be provided that 7,5
Deng.
Again as shown in figure 1, in the present embodiment, annular lime shaft kiln also includes inner cylinder cooling air system, wherein, this is interior
Cylinder cooling air system includes inner cylinder cooling blower（It is not shown）, be connected with inner cylinder cooling blower inner cylinder cooling wind inlet pipe 60,
9 inner cylinder cooling air outlets 62 positioned at the top of inner cylinder 10, it is connected to correspondingly on 9 inner cylinder cooling air outlets 62
9 inner cylinder cooling wind branch pipes 64 and side connect the upper burner of above-mentioned 9 of opposite side connection of 9 inner cylinder cooling wind branch pipes 64
41 inner cylinder cooling vane pipe 66, inner cylinder cooling wind inlet pipe 60 and 9 inner cylinder cooling air outlets 62 are arranged so as to cool down wind
Flowed into from the bottom of inner cylinder 10, top is flowed out, inner cylinder cooling vane pipe 66 is communicated to 9 upper burners 41 and helped to be provided for upper burner
Fire air.
In the present embodiment shown in Fig. 1, annular lime shaft kiln also includes being arranged so that cooling wind to circular passage 2
The bed of material cooling air system that the bed of material after interior calcining is cooled down, it includes bed of material cooling wind inlet pipe 70, on outer barrel 12
9 bed of material cooling air outlets 72,9 bed of materials cooling wind for being connected correspondingly with 9 bed of material cooling air outlets 72 goes out
Mouth branch pipe 74,9 bed of material cooling blowers 76 set with 9 one-to-one corresponding of bed of material cooling air outlet branch pipes 74, wherein, this 9
Individual bed of material cooling blower is used to the cooling wind for completing heat exchange in circular passage 3 being drawn into 9 bed of material cooling air outlets
In branch pipe 74,9 bed of material cooling air outlet branch pipes 74 connect to provide for it correspondingly with above-mentioned 9 lower burners 43
Combustion air.
Again as shown in figure 1, in the present embodiment, circular passage 2 includes preheating zone 21, top adverse current and calcined from top to bottom
Band 23, middle part adverse current burning zone 25, bottom without flowing quenched band 27 and cooling zone 28, wherein, preheating zone 21 is formed at cloth
Between glassware 3 and the top of inner cylinder 10, top adverse current burning zone 23 is located between the top of inner cylinder 10 and upper combustion chamber 40, middle part adverse current
Burning zone 25 is located between upper combustion chamber 40 and lower combustion chamber 42, and without flowing, quenched band 27 is located at lower combustion chamber 42 and the bed of material is cold for bottom
But between wind outlet 72, cooling zone 28 is located at the lower section of bed of material cooling air outlet 72.
Although not shown in Fig. 1, it should be noted that in the present embodiment, annular lime shaft kiln also includes being used for
From the main smoke discharging blower fan system of the outside drawing smoke in above-mentioned preheating zone 21, the main smoke discharging blower fan system includes being located at above-mentioned outer barrel top
Flue gas pump orifice, the smoke settlement pipe connected with flue gas pump orifice and the main Smoke connected with smoke settlement pipe in portion
Machine.It should be appreciated that in the present embodiment, main smoke discharging blower fan and above-mentioned 9 bed of material cooling blowers 76 are arranged so that 9
Negative pressure in lower combustion chamber 42 is consistent with the negative pressure at above-mentioned 9 bed of material cooling air outlets 72, so that in bottom without the quenched band of stream
Airless flows in 27.
It is further to note that in the present embodiment, inner cylinder 10 includes steel inner casing and the outer wall around inner cylinder 1 is built into
Refractory lining, outer barrel 12 also includes the refractory lining that is built into of outer steel shell and the inwall around outer barrel 12；Set in combustion chamber resistance to
Fiery liner, arch bridge is by refractory material laying.Annular lime shaft kiln calcining heat used is provided by burner, and fuel sprays through burner
Into combustion chamber, the space communicated with combustion chamber that the high-temperature gas that burning is produced is formed by arch bridge bottom enters the bed of material, is
Calcining in kiln body 1 provides heat.
Material is particularly in preheating zone 21, top adverse current burning zone 23, middle part adverse current burning zone in kiln body 1 below
25th, bottom is briefly described without the flow flowed in quenched band 27 and cooling zone 28：
Qualified lime stone loads in truck after being weighed through scale hooper, and truck is promoted to the kiln of annular lime shaft kiln by hoist engine
Top, the distributing device 3 that the lime stone in truck is added on kiln top is entered in kiln body 1 by distributing device 3.Then, material, at this
In embodiment be lime stone, by the preheating zone 21 in kiln body 1, top adverse current burning zone 23, middle part adverse current burning zone 25, under
Portion subsequently into kiln bottom feed bin, finally expels from kiln without quenched band 27 and cooling zone 28 is flowed, finished product warehousing is delivered to by conveyer
Deposit.
The combustion product gases of lower combustion chamber 42 flow up into middle part adverse current burning zone due to the suction of main smoke discharging blower fan
25, and after being mixed with the combustion product gases of upper combustion chamber 40 near upper arch bridge 50 together with enter top adverse current burning zone 23.Due to
In the two burning zones, the traffic direction of combustion-gas flow direction and material is on the contrary, so referred to as adverse current burning zone.
When material flows downward to middle part adverse current 25 bottom of burning zone, degree of calcination is higher（For 70%-90% or so）.
Continue downwards to bottom without quenched band 27 is flowed when, although no flue gas continues heat supply to it, but relies on material contained in itself
Heat, continues as material and carries out relaxing decomposition and quenched creation time and steric requirements, so as to produce active lime.
The high-temperature flue gas that upper combustion chamber 40, lower combustion chamber 42 burn flows through the bed of material and provides heat for the decomposition of lime stone
Afterwards, flowed up in the presence of main smoke discharging blower fan, fully enter preheating zone 21, and heat is carried out with the lime stone in preheating zone 21
Exchange, the flue-gas temperature for reaching the top of kiln body 1 is 90-120 DEG C.The flue gas at the top of preheating zone 21 is uniform via flue gas pump orifice
It is drawn into the stepping of going forward side by side of smoke settlement pipe and enters main smoke discharging blower fan.
Bed of material cooling air outlet is cooling zone 28 below 72 in circular passage 2.The annular lime shaft kiln of present embodiment
Also include ash discharge platform 8 and the ash hoist 81 on ash discharge platform, in the bottom of ash discharge platform 8, set 1 it is self-priming above-mentioned
Bed of material cooling wind inlet pipe 70, using the negative pressure of kiln body 1 by outside air（Referred to as cool down wind）It is drawn into kiln bottom feed bin（Figure is not
Show）It is interior, and ash hoist 8 is flowed through into cooling zone 28.Cooling wind carries out temperature after heat exchange with calcine and improved to 400 DEG C of left sides
It is right.
In bottom without flowing in quenched band 27, each bed of material cooling air outlet 72 by 1 VFC bed of material cooling blower
76 suctions, the cooling wind after preheating is extracted out, the combustion air of lower burner 43 is used as.The lime that calcining is completed passes through cooling zone 28
Temperature afterwards is reduced to 100 DEG C or so, and entering kiln bottom feed bin by ash hoist 81 stores.
The combustion gas in a lower kiln 1 and combustion air situation is described below:
Come from coal gas platform（It is not shown）Coal gas enter upper and lower totally 18 burners.The combustion that upper burner 41, lower burner 43 are supplied
Doses is different, and allotment ratio is about：Up/down=1/1.8.The combustion air of upper burner 41 comes from the cooling of inner cylinder 10
The surrounding air of wind, specifically inner cylinder cooling blower bulging enters inner cylinder 10, while cooling to inner cylinder steel sheel, itself
Then preheating temperature discharges to 200 DEG C or so from 9 inner cylinder cooling air outlets 62 at the top of inner cylinder, and cools down wind branch through inner cylinder
After pipe 64, inner cylinder cooling vane pipe 66 are collected, most of combustion air branch pipe for entering 9 upper burners 41（It is not shown）, as
The combustion air of upper combustion chamber 40.The unnecessary cooling wind of fraction then passes through the exhaust stack on inner cylinder cooling vane pipe 66（Figure is not
Show）It is discharged into atmospheric environment.
In upper combustion chamber 40, combustion gas is clean-burning with air, and excess air coefficient slightly has according to the calorific value of combustion gas
Difference, when using blast furnace gas, the excess air coefficient of present embodiment is controlled 1.2.
The combustion air of lower burner 42 comes from the cooling wind after cool lime.As it was previously stated, what 9 independences were controlled to adjust
Bed of material cooling blower 76 extracts the cooling wind after the preheating of cooling zone 28 out, is used as the combustion air of lower burner 42.In lower burning
In room 42, combustion gas is also clean-burning with air, and excess air coefficient is slightly different according to the calorific value of combustion gas, when using blast furnace
During coal gas, the coefficient of excess air of present embodiment is also controlled 1.2.
Compared to prior art, the present invention has the following technical effect that：
1）Annular lime shaft kiln can complete adverse current calcining and quenched without flowing in same annular space, therefore can stably give birth to
The high-quality active lime of output；
2）Combustion gas strong adaptability, can use minimum calorific value for 3000 kJ/Nm3Blast furnace gas, also can use high heating value height
Turn the solid fuels such as the gaseous fuels such as mixed gas, coal gas of converter, coke-stove gas, natural gas and coal, gas can be also used if necessary
Coal double fuel multifuel combustion；
3）Energy consumption is relatively low：Combustion gas and air carry out independent tune by respective temperature control needs in upper combustion chamber and lower combustion chamber
Save and burn completely, combustion gas burnout rate is high；Also, the waste heats such as inner cylinder cooling wind, bed of material cooling wind are fully used；
4）Kiln exhaust gas is after bag-type dust, and the discharge of exhaust gas particle thing can reach≤10mg/Nm3, with good environmental-protecting performance；It is special
Not, annular lime shaft kiln due to exhaust gas temperature it is low, its flue gas, which enters, need not be blended into cold wind before deduster, on the one hand reduce electricity
Consumption, on the other hand, can reduce the filtration velocity in deduster, further the service life of extension cloth bag and guarantee dedusting effect
Rate；
6）Extremely low NOx emission index：First, upper combustion chamber and lower combustion chamber use fuel/air mixture fractional combustion mode；Its
It is secondary, using low NOx burner, local smoke backflow area is formed in combustion chamber, the oxygen concentration of combustion space is reduced, and created
NOx reducing condition；Furthermore, because of the presence in smoke backflow area, the Temperature Distribution in combustion chamber is relatively uniform, reduces flame peak value
Temperature, it is suppressed that thermal NO x generation.Therefore, kiln strict guarantee NOx discharge is far below 100mg/Nm3（With NO2Meter）；
7）Kiln body equipment is simple, and equipment failure rate is low；
8）Annular lime shaft kiln is in the production process under negative-pressure operation, reduces well because firer makees to bring to surrounding enviroment
Pollution, improve the working environment of operating personnel, be also convenient for operating personnel to the equipment working condition of bed rearrangement kiln system
Grasp, inspection, the maintenance, repair work of equipment are also facilitated, operating personnel can have found, to normally producing potential failure, to protect in time
The quality of active lime is demonstrate,proved；
9）It is dislocation between cutting plate on annular lime shaft kiln between arch bridge and lower arch bridge, above lower arch bridge and ash hoist
Arrangement so that the material entered in kiln is repeatedly lateral at a certain angle to reallocate during moving downward --- secondary cloth
Material, makes material be more evenly distributed, improves material degree of being heated evenly.
The technology contents and technical characterstic of the present invention have revealed that as above, it being understood, however, that in the creative ideas of the present invention
Under, those skilled in the art can make various changes and improve to said structure, including individually disclose here or require protect
The combination of the technical characteristic of shield, and significantly include other combinations of these features.These deformations and/or combination each fall within this
In the involved technical field of invention, and fall into the protection domain of the claims in the present invention.
Claims (8)
1. a kind of annular lime shaft kiln, it is characterised in that including：
Kiln body, it has the inner cylinder and outer barrel of arranged concentric, circular passage is formed between inner cylinder and outer barrel；
Distributing device, it is installed in circular passage upper end；
Multiple upper combustion chamber and multiple lower combustion chamber, it is spaced apart above and below excircle along outer barrel；
Multigroup upper burner and multigroup lower burner, it is installed in multiple upper combustion chamber and multiple lower combustion chamber respectively correspondingly
On；
Multiple upper arch bridges and multiple lower arch bridges, it is located between outer barrel and inner cylinder, for correspondingly by multiple upper combustion chamber
It is connected respectively with inner cylinder with multiple lower combustion chamber；
Inner cylinder cooling air system, it include inner cylinder cooling wind inlet pipe and on inner cylinder it is many correspondingly with multiple upper burners
Individual inner cylinder cooling air outlet, and be arranged so as to cool down bottom inflow, top outflow of the wind from inner cylinder；
Bed of material cooling air system, it include the bed of material cooling wind inlet pipe and on outer barrel it is many correspondingly with multiple lower burners
Individual bed of material cooling air outlet, and it is arranged so that cool down wind cools down to the bed of material after being calcined in circular passage；
Wherein, the circular passage is configured to preheating zone between being located at the top of distributing device and inner cylinder, positioned at inner cylinder from top to bottom
Top adverse current burning zone between top and multiple upper combustion chamber, between multiple upper combustion chamber and multiple lower combustion chamber in
Portion's adverse current burning zone, the bottom between multiple lower combustion chamber and multiple bed of material cooling air outlets are without the quenched band of stream, Yi Jiwei
Cooling zone below multiple bed of material cooling air outlets.
2. annular lime shaft kiln according to claim 1, it is characterised in that the inner cylinder cooling air system is also included at least
One inner cylinder cooling blower, multiple inner cylinders cooling wind branch pipe and an inner cylinder cooling vane pipe, wherein, inner cylinder cooling blower with
The inner cylinder cooling wind inlet pipe is connected for cooling wind to be sent into the inner cylinder, and multiple inner cylinders cool down one end one of wind branch pipe
One is accordingly connected to the multiple inner cylinder cooling air outlet, and the other end is all communicated on inner cylinder cooling vane pipe, and the inner cylinder is cold
But vane pipe is connected to provide combustion air for it with the multiple upper burner.
3. annular lime shaft kiln according to claim 1 or 2, it is characterised in that the multiple bed of material cooling air outlet one
One is accordingly connected to multiple bed of material cooling air outlet branch pipes, and the bed of material cooling air system also includes multiple bed of materials and cools down wind
Machine, the plurality of bed of material cooling blower and the plurality of bed of material cooling air outlet branch pipe are corresponded and be used for will heat in the cooling zone
Cooling wind after exchange is drawn into multiple bed of material cooling air outlet branch pipes, and the plurality of bed of material cooling air outlet branch pipe is corresponded
Ground is connected to provide combustion air for it with the multiple lower burner.
4. annular lime shaft kiln according to claim 3, it is characterised in that also including for outwards being taken out from the preheating zone
The main smoke discharging blower fan system of smoking gas, the main smoke discharging blower fan system include be located at the outer barrel at the top of on flue gas pump orifice, with
The smoke settlement pipe and the main smoke discharging blower fan that connect with smoke settlement pipe of flue gas pump orifice connection, wherein, main smoke discharging blower fan with
The negative pressure and the multiple bed of material cooling wind that the multiple bed of material cooling blower is arranged so that in the multiple lower combustion chamber go out
Negative pressure at mouthful is consistent, so as to be flowed in the bottom without airless in quenched band is flowed.
5. annular lime shaft kiln according to claim 4, it is characterised in that the multiple upper combustion chamber and it is the multiple under
Combustion chamber is arranged to combustion gas fully burning in it with the combustion air.
6. annular lime shaft kiln according to claim 1, it is characterised in that the multiple upper combustion chamber and it is the multiple under
Combustion chamber uses fuel/air mixture fractional combustion mode, and/or the multiple upper burner and the multiple lower burner all using low
NOx burners.
7. annular lime shaft kiln according to claim 1, it is characterised in that also including ash discharge platform and positioned at ash discharge platform
On ash hoist, bed of material cooling wind inlet pipe is arranged at ash discharge mesa base and using the negative pressure in the kiln body by the external world
Air is sucked in the kiln body.
8. annular lime shaft kiln according to claim 7, it is characterised in that also including many above the ash hoist
Individual cutting plate, wherein, between the multiple upper arch bridge and the multiple lower arch bridge, the multiple lower arch bridge and the multiple sub-material
It is dislocation arrangement between plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710346004.9A CN106986561B (en) | 2017-05-17 | 2017-05-17 | Annular lime shaft kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346004.9A CN106986561B (en) | 2017-05-17 | 2017-05-17 | Annular lime shaft kiln |
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| CN106986561B CN106986561B (en) | 2023-05-02 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109160749A (en) * | 2018-11-09 | 2019-01-08 | 余松涛 | Circulation fine grained lime shaft kiln and its method for calcinating in a kind of |
| CN109437605A (en) * | 2018-12-11 | 2019-03-08 | 南京钢铁股份有限公司 | A kind of building method of LIME DOUBLE D kiln interface channel |
| CN109574522A (en) * | 2018-12-25 | 2019-04-05 | 石家庄新华能源环保科技股份有限公司 | A kind of sleeve kiln combustion system |
| CN110981229A (en) * | 2019-12-26 | 2020-04-10 | 余松涛 | Annular sleeve type shaft kiln and method for calcining co-fired lime |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
| CN115175883A (en) * | 2020-02-26 | 2022-10-11 | 麦尔兹欧芬堡股份公司 | Method for burning carbonaceous material in a GGR shaft furnace |
| CN115190959A (en) * | 2020-02-25 | 2022-10-14 | 麦尔兹欧芬堡股份公司 | Apparatus and method for burning and/or calcining bulk material |
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| CN109160749A (en) * | 2018-11-09 | 2019-01-08 | 余松涛 | Circulation fine grained lime shaft kiln and its method for calcinating in a kind of |
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| CN109437605A (en) * | 2018-12-11 | 2019-03-08 | 南京钢铁股份有限公司 | A kind of building method of LIME DOUBLE D kiln interface channel |
| CN109574522A (en) * | 2018-12-25 | 2019-04-05 | 石家庄新华能源环保科技股份有限公司 | A kind of sleeve kiln combustion system |
| CN110981229A (en) * | 2019-12-26 | 2020-04-10 | 余松涛 | Annular sleeve type shaft kiln and method for calcining co-fired lime |
| CN115190959A (en) * | 2020-02-25 | 2022-10-14 | 麦尔兹欧芬堡股份公司 | Apparatus and method for burning and/or calcining bulk material |
| CN115175883A (en) * | 2020-02-26 | 2022-10-11 | 麦尔兹欧芬堡股份公司 | Method for burning carbonaceous material in a GGR shaft furnace |
| CN115175883B (en) * | 2020-02-26 | 2024-03-15 | 麦尔兹欧芬堡股份公司 | Method for burning carbonaceous material in GGR shaft furnace |
| CN112146447A (en) * | 2020-09-15 | 2020-12-29 | 广西柳州钢铁集团有限公司 | Method for preventing ash spraying of air release valve of double-chamber kiln |
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| CN106986561B (en) | 2023-05-02 |
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