CN102066587A - Method for producing iron ore pellets - Google Patents
Method for producing iron ore pellets Download PDFInfo
- Publication number
- CN102066587A CN102066587A CN2009801221795A CN200980122179A CN102066587A CN 102066587 A CN102066587 A CN 102066587A CN 2009801221795 A CN2009801221795 A CN 2009801221795A CN 200980122179 A CN200980122179 A CN 200980122179A CN 102066587 A CN102066587 A CN 102066587A
- Authority
- CN
- China
- Prior art keywords
- pelletizing
- preheating chamber
- grate
- dewatering station
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
- C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
- F27B21/06—Endless-strand sintering machines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Provided is a method for producing pellets wherein bursting in the preheating chamber of a grate furnace can be prevented surely in a grate-kiln pelletizing system. The current operational conditions (e.g. at least one of the burning capacity of a water-separation-chamber burner (31), the burning capacity of a preheating-chamber burner (21), the moving speed of a grate, or the thickness of a pellet layer) are regulated such that the temperature difference DeltaT=T2-T1 between the atmospheric temperature (T2) in the upper space of a preheating chamber (5) measured by means of a thermometer (43) provided separately at the inlet of the preheating chamber (5) and the gas temperature (T1) at the outlet of a water separation chamber (4) measured by means of a water-separation-chamber-outlet grate thermometer (42) provided directly under a grate (2) becomes smaller than an allowable temperature difference DeltaTmax which is determined beforehand based on the actual operational performance in the past.
Description
Technical field
The present invention relates to make the manufacturing technology based on the iron ore pellet of grate kiln (grate kiln) mode of blast furnace with employed iron ore pellets (pellet) such as raw materials.
Background technology
Make the manufacturing process of iron ore pellet, comprise drying, dehydration, preheating, burn till and cool off each operation.Known have the employed grate kiln mode of the enforcement iron ore pellet manufacturing installation of this manufacturing process (to be designated hereinafter simply as " grate kiln mode burning apparatus ".)。In grate kiln mode iron ore pellet manufacturing installation, the technology (with reference to patent documentation 1,2) of the generation of the kiln wheel band in the known rotary kiln (rotary kiln) that the reason that prevents to constitute fluctuation of service arranged (kiln ring: pelletizing efflorescence thing with the rock shape attached to kiln inwall kiln brick surface).
, in order to tackle the increase of iron and steel demand in recent years, require pelletizing further to increase production.In addition, along with the poor qualityization of in recent years iron ore raw material, also require the increase of allotment ratio of the high crystal water ore of pelletizing.Yet, in order to tackle these requirements, if only increase the production rate of pelletizing, or when the production rate of keeping pelletizing only improves crystal water content among the green pellets GP, then can't fully crystal water be decomposed and remove through dehydration procedure, therefore under the inner residual state that crystal water arranged of pelletizing, it just is brought in the preheating procedure of higher temperature.The pelletizing that is brought into preheating procedure heats up rapidly, and the crystal water that remains in pelletizing inside decomposes rapidly, and the water vapor pressure of pelletizing inside sharply rises, thereby break (bursting, the explosion) of pelletizing takes place.The powder that takes place because of explosion causes the air permeability of pelletizing layer to worsen, and hinders heating equably, the crushing increase of pelletizing layer etc., and fluctuation of serviceization, and the intensity of preheating pelletizing reduces.Consequently, the powder of generation is brought in the kiln, and the low preheating pelletizing of intensity rotates and efflorescence in kiln, therefore forms rotary kiln tyre, and operation can not be proceeded.Therefore, for fear of above-mentioned such explosion, final result is to have to reduce pellet formation speed.
Patent documentation 1: the spy opens flat 11-325740 communique
Patent documentation 2: the spy opens the 2005-60762 communique
Summary of the invention
Therefore, the objective of the invention is to, a kind of manufacture method of pelletizing is provided, in the pelletizing manufacturing installation of grate kiln mode, can prevent in the preheating chamber of grate furnace, explosion to take place infalliblely.
The present invention is a kind of manufacture method of iron ore pellet, be with fire grate iron ore pellet to be moved on one side, it is heated according to this order by kiln, dewatering station and preheating chamber on one side, the manufacture method of the iron ore pellet of the grate kiln mode of burning till with rotary kiln more afterwards with rotary kiln burner, it is characterized in that, regulate current operational condition, make T
2And T
1Temperature difference T=T
2-T
1Than the permission temperature difference T that is scheduled to based on the actually operating in past
MaxLittle, T
2Be the measured atmosphere temperature of preheating chamber temperature in meter of being located at the pelletizing inlet portion of described preheating chamber at the upper space of described preheating chamber separately, T
1Be pelletizing export department in described dewatering station be located at described fire grate under the measured gas temperature of dewatering station's outlet grate thermometer.
In the manufacture method of iron ore pellet, being adjusted to of preferred described current operational condition, be located at described dewatering station top dewatering station's burner quantity combusted, be located at least one the adjusting in quantity combusted, fire grate translational speed and the pelletizing layer thickness of preheating chamber burner on top of described preheating chamber.
According to the present invention,, make preheating chamber temperature in T by regulating current operational condition
2With dewatering station's grate temperature T
1Temperature difference T=T
2-T
1Than the permission temperature difference T that is scheduled to based on the actually operating in past
MaxLittle, thus the heat-up rate of the pelletizing of inhibition preheating chamber inlet portion can prevent from this preheating chamber explosion to take place thus infalliblely.
Consequently, by using the present invention, can reach pelletizing volume increase and even high crystal water ore infalliblely and increase and join.
Description of drawings
Fig. 1 is the longitudinal diagram of an example of the related grate kiln mode iron ore pellet manufacturing installation of expression enforcement of the present invention.
Fig. 2 be expression preheating chamber bellows pressure through the time state that changes graphic representation.
Fig. 3 is the graphic representation of relation of the flour extraction rate of expression heat-up rate of pelletizing and preheating pelletizing.
Fig. 4 is the longitudinal diagram that the expression thermopair flows and concerns with thermopair and the dewatering station position of outlet grate thermometer on short transverse.
Fig. 5 is expression preheating chamber temperature in T
2With dewatering station's outlet grate temperature T
1Temperature difference T and preheating chamber bellows pressure P
PHWBThe graphic representation of relation.
Nomenclature
1 ... grate furnace (grate furnace)
2 ... move back and forth fire grate (fire grate)
3 ... kiln
4 ... dewatering station
4a ... dewatering station's roof
4b ... dewatering station's inlet
4c ... dewatering station's outlet
5 ... preheating chamber
6 ... preheating chamber bellows group
7 ... the preheating chamber vacuum fan
9 ... rotary kiln
10 ... rotary kiln burner
11 ... central cooler (annular cooler)
16 ... dewatering station's bellows group
17 ... dewatering station's vacuum fan
21 ... the preheating chamber burner
31 ... dewatering station's burner
41 ... preheating chamber bellows pressure warning unit
42 ... dewatering station's outlet grate thermometer
43 ... preheating chamber temperature in meter
44 ... the preheating chamber thermometer
A ... preheating chamber exhaust (heating gas)
GP ... green pellets
Embodiment
Fig. 1 represents to implement the grate kiln mode burning apparatus of the manufacture method of iron ore pellet of the present invention.As shown in the drawing, this grate kiln mode burning apparatus has grate furnace 1, rotary kiln (being designated hereinafter simply as " kiln ") 9 and central cooler 11.
Grate furnace 1 follows cyclic and moves back and forth fire grate (following only be called " fire grate " by being.) 2, the green pellets GP that is laid on this fire grate 2 is moved according to the order of kiln 3, dewatering station 4, preheating chamber 5 lengthwise direction along each chamber, on one side carry out drying, dehydration, preheating with the downward ventilation of gas by heating, to pelletizing (hereinafter referred to as " preheating pelletizing ".) give the intensity of the rotation that can tolerate kiln 9.
Green pellets GP is that allotment adds as the Wingdale of auxiliary material, rhombspar (dolomite) etc. that moisture and granulation form again in as the iron ore of main raw material.
At first in kiln 3, make green pellets GP drying about moisture content 8～9 quality % with about 250 ℃ atmosphere temperatures.Secondly in dewatering station 4, the green pellets of drying being warming up to about 450 ℃, mainly is the crystal water in the iron ore to be decomposed remove.In preheating chamber 5, pelletizing is warming up to about 1100 ℃, contained carbonate among decomposition Wingdale, the rhombspar etc. is removed CO again
2, and make magnetite oxidation in the iron ore.Through such operation, can make preheating pelletizing, thereby can improve the productivity of grate kiln mode burning apparatus with the intensity that can fully tolerate the rotation in the kiln 9.
In addition, be provided with preheating chamber burner 21, as the kiln burning and gas-exhausting intensification mechanism that is used to make from the kiln burning and gas-exhausting intensification of rotary kiln 9 on the top of preheating chamber 5.As the fuel of preheating chamber burner 21, use be that coke-oven gas (is designated hereinafter simply as " COG ".), the micro mist charcoal, in preheating chamber 5, make the burning of this COG, micro mist charcoal with the residual oxygen in the kiln burning and gas-exhausting, the kiln burning and gas-exhausting is heated up.So, can improve the intensity of preheating pelletizing, prevent to constitute the technology (with reference to patent documentation 1,2) of the generation of kilns wheel band in the rotary kiln 9 of reason of fluctuation of service (kiln ring: pelletizing efflorescence thing with the rock shape attached to kiln inwall kiln brick surface).
The 6th, preheating chamber bellows group.The following side space of fire grate 2 is partitioned into a plurality of chambers along the pelletizing travel direction, and these chambers are called as bellows.That is to say that preheating chamber is made of a plurality of bellows with bellows group 6, corresponding with preheating chamber 5, along its lengthwise direction (pelletizing travel direction) and be provided with row 9 bellows for example.The 7th, the preheating chamber vacuum fan, have exhausting amount (ventilation downwards) and regulate the air door of fan (fan damper) (diagram is omitted) of usefulness, use gas with the kiln exhaust as heating, should heat by the pelletizing layer on the fire grate 2, bellows group 6 and attract downwards, send to next dewatering station 4 with gas.
The 16th, dewatering station's bellows group.Corresponding with dewatering station 4, along its lengthwise direction (pelletizing travel direction) and be provided with row 5 bellows for example.The 17th, dewatering station's vacuum fan, have exhausting amount (ventilation downwards) and regulate the air door of fan (fan damper) (diagram is omitted) of usefulness, with preheating chamber exhaust A is heating gas channeling dewatering station 4, should heat by the pelletizing layer on the fire grate 2, bellows group 16 and to attract downwards, send to next kiln 3 with gas A.
Above-mentionedly control the technology of atmosphere temperature in the preheating chamber by preheating chamber burner 21 is set, fix in pellet formation speed, the crystal water content among the green pellets GP is also fixedly the time, is unusual effective means for the intensity that improves the preheating pelletizing.
In dewatering station 4, be provided with the burner 31 that makes from the exhaust-gas temperature rising of preheating chamber 5 (hereinafter referred to as " dewatering station's burner ".), even when volume increase, it also can remove crystal water (being willing to 2008-84178 number with reference to special) fully from pelletizing in dewatering station 4.But,, still can not prevent the explosion that in preheating chamber 5, takes place fully even after dewatering station's burner 31 is set.
At this, discoveries such as the inventor, the explosions that take place in the preheating chamber 5, the pressure in the interior case of the most close kiln 9 of pelletizing export department that can be by being in preheating chamber 5 is (hereinafter referred to as " preheating chamber bellows pressure ".) P
PHWBChange and detected.Fig. 2 is a preheating chamber bellows pressure P under certain operation condition
PHWBThrough the time state that changes an example, but preheating chamber bellows pressure P
PHWBUsually (gauge pressure is descended together at-340～380mmAq.Wherein, 1mmAq=9.80665Pa.) between the change, with respect to this, begin rapid reduction suddenly, can confirm the low situation of ratio-400mmAq.So, preheating chamber bellows pressure P
PHWBWhy can significantly reduce than normal conditions, be considered to owing in the pelletizing layer of preheating chamber 5 explosion takes place, the air permeability of pelletizing layer worsens, and crushing sharply increases.
Therefore as can be known, by real-time monitoring preheating chamber bellows pressure P
PHWBChange, the explosions that can detect in the preheating chamber 4 take place, but because this detection is to take place afterwards, can be in the method that prevents that in advance infalliblely explosion from taking place so also will develop.
Contrivers etc. think, in the explosion of preheating chamber 5 took place, the tool influence of the heat-up rate of the pelletizing when dewatering station 4 brings preheating chamber 5 at first, was investigated its influence by following laboratory test.
At first, the request for utilization people is arranged on the employed allotment raw material of pelletizing manufacturing installation that adds in the iron work of ancient river, manufactures the green pellets of particle diameter 10～12mm, the about 8.5 quality % of moisture content with stratotype tablets press (tier type pelletizer).Then, the temperature field of the pelletizing lower layer part that will obtain mobile by the thermopair in the above-mentioned pelletizing manufacturing installation (with reference to following) as a reference, with small-sized moisture eliminator with 105 ℃ to green pellets dry 20 minutes, become (being equivalent to kiln) behind the dry pelletizing that moisture content reaches about 0.2 quality %, with 300 ℃ this drying pelletizing was heated 5 minutes again with small-sized moisture eliminator, become dehydration pelletizing (being equivalent to dewatering station).Then, this dehydration pelletizing is encased in the small-sized process furnace of the atmosphere temperature that is adjusted to regulation, kept 2 minutes and become preheating pelletizing (being equivalent to preheating chamber), make the measured temperature transition of the thermopair be located at directly over the pelletizing approximate linear and try to achieve the heat-up rate of pelletizing, and the mass ratio of the screen underflow that the 5mm that measures the preheating pelletizing is following, with its flour extraction rate, judge whether to take place explosion according to the flour extraction rate of this preheating pelletizing as the preheating pelletizing.
The relation of the flour extraction rate of the heat-up rate of expression pelletizing and preheating pelletizing among Fig. 3.As can be known as shown in the drawing, the heat-up rate of pelletizing fixed value (6～7 ℃/when s) following, the flour extraction rate of preheating pelletizing is suppressed at all the time and is lower than 0.5 quality %, with respect to this, if the heat-up rate of pelletizing surpasses the said fixing value, then the flour extraction rate of preheating pelletizing sharply rises, and the life of starting bursts open.
Therefore, can confirm that the heat-up rate of the pelletizing by will be when dewatering station brings preheating chamber into is controlled at below the fixed value, can prevent that the explosion in the preheating chamber from taking place according to the result of above-mentioned laboratory test.
Yet, in the pelletizing manufacturing installation of real machine, be not easy directly to measure the heat-up rate of the pelletizing layer on the fire grate that is moving.Though also can carry out following measurement: for example with fixing a point; in the basket of wire cloth system, fill green pellets; in this green pellets packing layer, insert rectangular thermopair; then with its mounting on fire grate; the temperature transition of the pelletizing layer that measurement is moved along with fire grate (hereinafter referred to as " thermopair flows "); but this spends cost and time very much, is not the method that can implement often therefore.
Therefore, considerations such as the inventor, as with the heat-up rate corresponding parameter of pelletizing layer, whether can adopt can measure often and measure easily, preheating chamber temperature in T
2With dewatering station's outlet grate temperature T
1Temperature difference T=T
2-T
1Replace directly measuring the heat-up rate of pelletizing layer.At this, preheating chamber temperature in T
2Be meant, by the atmosphere temperature of the preheating chamber temperature in instrumentation amount of the pelletizing inlet portion of being located at preheating chamber 5.Dewatering station's outlet grate temperature T
1Be meant, by the pelletizing export department of dewatering station and be located at pelletizing under the gas temperature of dewatering station's outlet grate thermometer measure.
At first, the contriver waits and has investigated dewatering station's outlet grate temperature T
1(also have, be heated,, explosion takes place easily, with the flow relation of temperature of measured pelletizing lower layer part of thermopair therefore usually with the temperature of thermopair flow measurement pelletizing lower layer part so that the pelletizing lower layer part heats up is the slowest because the pelletizing layer ventilates through downwards.)。As shown in Figure 4, thermopair 42 as dewatering station's outlet grate temperature gauge, the position of its short transverse is as far as possible near the position of pelletizing lower layer part, be arranged at fire grate 2 and just descending the position of 200mm, thermopair flows and is arranged on the short transverse middle position of pelletizing lower layer part, the i.e. position of 35mm directly over the fire grate 2 with thermopair.Then, the comparative heat galvanic couple flow with thermopair come dewatering station's outlet grate temperature 42 directly over by both party thermopair (thermometer) is measured respectively during the position temperature, the result is shown in following table 1, dewatering station exports the grate temperature T
1Though a little lower slightly than the flow temperature of measured pelletizing lower layer part of thermopair, its temperature difference all the time almost fixed about 25 ℃.Therefore can confirm, according to dewatering station's outlet grate temperature T
1Can estimate the temperature of pelletizing lower layer part.
[table 1]
Therefore, be arranged in the pelletizing manufacturing installation that adds in the iron work of ancient river, investigate above-mentioned preheating chamber temperature in T the applicant
2With dewatering station's outlet grate temperature T
1Temperature difference T and preheating chamber bellows pressure P
PHWBRelation, its result can access relation shown in Figure 5.
As shown in the drawing, in temperature difference T and preheating chamber bellows pressure P
PHWBBetween, (straight line among the figure is a regression straight line though confirm very strong correlationship as can be known on the whole.), but along with temperature difference T uprises, preheating chamber bellows pressure P
PHWBThe situation (being equivalent to take place explosion) that reduces greatly from regression straight line increases.
Therefore, by temperature difference T being maintained below the specified temperature (for example 850 ℃), can fully reduce preheating chamber bellows pressure P
PHWBSignificantly the probability of Jiang Diing has prevention that the possibility of explosion takes place.
As shown in Figure 1, for the temperature that makes preheating chamber exhaust A rises, a plurality of dewatering station burner is set in dewatering station 4, it is used for being blown into for example such geseous fuel of COG in dewatering station 5.Fuel as dewatering station's burner 31, why do not adopt the micro mist charcoal and adopt geseous fuel, be because be blown into low the reaching about 400～450 ℃ of temperature of the preheating chamber exhaust A of dewatering station 4, therefore when adopting the micro mist charcoal, if there is not ignition source then can not burn away, with respect to this, when adopting geseous fuel, also can burn away automatically even without ignition source.In addition as shown in Figure 1, when dewatering station's burner 31 is arranged at roof 4a, if use micro mist charcoal burner, then burner flame is elongated, so the most surperficial pelletizing of pelletizing layer is overheated, and explosion takes place easily, therefore from this point, also to use the short geseous fuel of burner flame to be advisable.
In the following description, " inlet " and " outlet " of " dewatering station's inlet " and " dewatering station's outlet " is that the travel direction with pelletizing is a benchmark.Above-mentioned a plurality of burner 31, recommending with the inlet 4b of dewatering station is that basic point is equipped on (1/3) L
DH～0.98L
DH(L
DH: dewatering station's length overall).This be because, if be basic point and be lower than (1/3) L with dewatering station inlet 4b
DHThe position burner 31 is set, then the atmosphere temperature of dewatering station inlet 4b neighborhood rises, can't thorough drying in the kiln 3 and the residual pelletizing that the attached water state arranged when being brought into dewatering station 4, explosion takes place easily.On the other hand, if be basic point and surpassing 0.98L with dewatering station inlet 4b
DHThe position (that is be that basic point is lower than 0.02L, with dewatering station outlet 4c
DHThe position) burner 21 is set, then burner 21 is near excessively apart from the next door of the outlet 4c of dewatering station, causes the refractory body in this next door to sustain damage easily from the radiant heat of burner flame.Above-mentioned a plurality of burner 31 is that basic point is equipped on (1/2) L with the inlet 4b of dewatering station more preferably
DH～0.95L
DHBetween, especially preferably be equipped on (1/3) L
DH～0.92L
DHBetween.
Then, the position under the pelletizing export department (for example fire grate travel direction middle position of the bellows of dewatering station's 4 the most close kilns 9) of dewatering station 4 and fire grate 2 is provided as the thermopair 42 of dewatering station's outlet grate thermometer.In addition, distinguish mutually with preheating chamber thermometer 44, at the pelletizing inlet portion (for example fire grate travel direction middle position of the bellows of close inlet side of preheating chamber 5) of preheating chamber 5 and at the upper space of pelletizing layer, be provided as the thermopair 43 of preheating chamber temperature in meter.At this, why thermopair 42 is set in the pelletizing outlet and the position under fire grate 2 of dewatering station 4, be for will be as the closest corresponding temperature of the undermost temperature of pelletizing of described measurement like that as far as possible accurately in the past with the export department of dewatering station 4.In addition, why at the inlet portion of preheating chamber 5 and at the upper space of pelletizing thermopair 43 being set, is in order to measure the atmosphere gas temperature that heating just has been brought into the pelletizing layer behind the preheating chamber 5 more accurately.Here, in order fully to guarantee the said temperature measuring accuracy, so-called " the pelletizing export department of dewatering station 4 " meaning is to reach 0.2L apart from the 4 outlet 4c of dewatering station
DH(0.1L more preferably
DH) scope, described " the pelletizing inlet portion of preheating chamber 5 " meaning is to reach 0.2L apart from preheating chamber 5 inlet
DH(0.1L more preferably
DH, wherein, L
DH: the scope preheating chamber length overall).
Then, with these thermopairs 42 and 43, measure dewatering station's outlet grate temperature T in real time
1With preheating chamber temperature in T
2
On the other hand, such as has been elaborated, with the pressure warning unit (preheating chamber bellows pressure warning unit) 41 in the bellows of the most close kiln 9 that is arranged on preheating chamber 5, measure preheating chamber bellows pressure P often
PHWBAlso having, why measure the interior pressure of bellows of the most close kiln 9 of preheating chamber 5, is that owing to no matter in which position of preheating chamber 5 explosion takes place can both passing through here, detecting pressure changes.
Then, temperature difference T and the preheating chamber bellows pressure P of collecting in the operation that the past was implemented
PHWBRelation be depicted as for example such distribution plan of Fig. 5, use this figure to determine to allow temperature difference T
MaxFor example, when having the concerning of Fig. 5, as described above, 850 ℃ that the plotting position that breaks away from regression straight line far away is fewer as allowing temperature difference T
MaxGet final product.
Then, according to the T that in current operation, measures
1And T
2Calculate its temperature difference T (=T
2-T
1), regulate current operational condition, make this temperature difference T than predetermined by the way permission temperature difference T
MaxLittle getting final product.
As the concrete grammar that is used to regulate above-mentioned current operational condition, the method of the quantity combusted of use adjusting dewatering station burner 31, the quantity combusted of preheating chamber burner 21, fire grate translational speed, pelletizing layer thickness etc. gets final product, these methods can be distinguished use separately, also can several different methods and usefulness.Below these methods are described.
(quantity combusted of dewatering station's burner 31)
At Δ T than Δ T
MaxWhen big,, regulate thus towards the further direction operation that strengthens the quantity combusted of dewatering station's burner 31.If so, then will improve T
1, consequently can reduce Δ T.
The adjusting of quantity combusted is undertaken by the fuel feed of regulating to dewatering station's burner 31.
But, if the quantity combusted of dewatering station's burner 31 is excessive, then, cause the zone of the part in the pelletizing layer to arrive crystal water decomposition temperature in the ore because dewatering station's temperature rises, there is the possibility that explosion takes place.Therefore, there is limit in the quantity combusted of increasing dewatering station burner 31.
(quantity combusted of preheating chamber burner 21)
At Δ T than Δ T
MaxWhen big,, regulate thus towards the direction operation of the quantity combusted that further reduces preheating chamber burner 21.If so, then will reduce T
2, consequently can reduce Δ T.
The adjusting of quantity combusted is undertaken by the fuel feed of regulating to preheating chamber burner 21.
(fire grate translational speed)
At Δ T than Δ T
MaxWhen big,, regulate thus towards the direction operation of further increasing fire grate translational speed.If so, then the pelletizing layer from T
1Measure the place to T
2Measure the place and move the required time and further reduce, therefore the heat that is subjected to of pelletizing is littler therebetween, consequently can reduce Δ T.
(pelletizing layer thickness)
At Δ T than Δ T
MaxWhen big,, regulate thus towards the direction operation of the thickness of further increase pelletizing.If so, even then the heat of supplying with to the pelletizing layer is identical, the intensification of pelletizing layer also needs the time, so the pelletizing layer is from T
1Measure the place to T
2The ascending temperature of measuring during move in the place becomes littler, consequently can reduce Δ T.
The adjusting of pelletizing layer thickness, the green pellets stage before entering kiln 3 carries out.
The temperature distribution that has thickness direction in the pelletizing bed thickness, by further increasing pelletizing layer thickness, the temperature deviation of thickness direction enlarges in the layer.Because this temperature deviation enlarges, there is the possibility that explosion takes place in the zone of a part, it is also limited therefore to increase the pelletizing layer thickness.
As above-mentioned, regulate current operational condition, make temperature difference T than allowing temperature difference T
MaxLittle, preheating chamber bellows pressure P thus
PHWBSignificantly the probability of Jiang Diing diminishes, and can prevent the explosion in the preheating chamber 5 to take place more infalliblely.
Consequently, the excellent air permeability of pelletizing layer is maintained, and uniform heating is guaranteed that the intensity of preheating pelletizing improves.And, even being subjected to rotating, the high preheating pelletizing of this intensity also is difficult to efflorescence in kiln 9, can prevent the generation of kiln wheel band, can realize more stable, the more manufacturing of high productivity and more high-quality pelletizing.
Claims (2)
1. the manufacture method of an iron ore pellet, be with fire grate iron ore pellet to be moved on one side, it is heated according to this order by kiln, dewatering station and preheating chamber on one side, the manufacture method of the iron ore pellet of the grate kiln mode of burning till with rotary kiln more afterwards with rotary kiln burner, it is characterized in that
Regulate current operational condition, make T
2And T
1Temperature difference T=T
2-T
1Than the permission temperature difference T that is scheduled to based on the actually operating in past
MaxLittle, T
2Be the measured atmosphere temperature of preheating chamber temperature in meter of being located at the pelletizing inlet portion of described preheating chamber at the upper space of described preheating chamber separately, T
1Be pelletizing export department in described dewatering station be located at described fire grate under the measured gas temperature of dewatering station's outlet grate thermometer.
2. the manufacture method of iron ore pellet according to claim 1, wherein, the adjusting of described current operational condition is for the quantity combusted of dewatering station's burner on the top of being located at described dewatering station, be located at least one the adjusting in quantity combusted, fire grate translational speed and the pelletizing layer thickness of preheating chamber burner on top of described preheating chamber.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008185045A JP2010024477A (en) | 2008-07-16 | 2008-07-16 | Method for producing iron ore pellet |
| JP2008-185045 | 2008-07-16 | ||
| PCT/JP2009/060872 WO2010007849A1 (en) | 2008-07-16 | 2009-06-15 | Method for producing iron ore pellets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102066587A true CN102066587A (en) | 2011-05-18 |
| CN102066587B CN102066587B (en) | 2014-09-03 |
Family
ID=41550257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980122179.5A Active CN102066587B (en) | 2008-07-16 | 2009-06-15 | Method for producing iron ore pellets |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP2010024477A (en) |
| CN (1) | CN102066587B (en) |
| AU (1) | AU2009272126B2 (en) |
| BR (1) | BRPI0915703B1 (en) |
| TW (1) | TWI396750B (en) |
| UA (1) | UA101209C2 (en) |
| WO (1) | WO2010007849A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484026A (en) * | 2020-12-04 | 2021-03-12 | 鞍钢集团矿业有限公司 | Double-rotational-flow pulverized coal burner and chain grate with same |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127175A (en) * | 2009-12-17 | 2011-06-30 | Kobe Steel Ltd | Method for manufacturing iron ore pellet |
| CN102305805B (en) * | 2011-07-29 | 2012-12-19 | 中南大学 | Method for detecting moisture distribution at material layer in chain grate machine in pelletizing production process |
| CN105066588A (en) * | 2015-07-28 | 2015-11-18 | 无锡市宝宜耐火材料有限公司 | Castable drying device used for iron hook |
| JP6368693B2 (en) * | 2015-07-29 | 2018-08-01 | 株式会社神戸製鋼所 | Sintered pellet manufacturing equipment |
| JP6520632B2 (en) * | 2015-10-15 | 2019-05-29 | 日本製鉄株式会社 | Evaluation method for blasting properties of materials for rotary hearth furnace |
| JP2019526029A (en) * | 2016-07-29 | 2019-09-12 | ポスコＰｏｓｃｏ | Sintering apparatus and method for producing sintered ore using the same |
| CN110484718B (en) * | 2019-10-09 | 2024-04-23 | 中冶北方（大连）工程技术有限公司 | Chain grate machine heat supplementing system and method suitable for iron ore concentrate production |
| CN110876892A (en) * | 2019-12-19 | 2020-03-13 | 烟台龙源电力技术股份有限公司 | Grate rotary kiln middle section SCR deNOx systems and temperature compensating device thereof |
| CN111910071A (en) * | 2020-09-11 | 2020-11-10 | 黄湛明 | Grate-rotary kiln pellet low NOx production system |
| CN112066731B (en) * | 2020-09-25 | 2022-05-27 | 中冶北方（大连）工程技术有限公司 | Hot air system of chain grate machine |
| WO2022214862A1 (en) * | 2021-04-06 | 2022-10-13 | Paya Sanat Sama Co. | A pelletizing pilot plant |
| EP4400766A1 (en) | 2021-09-09 | 2024-07-17 | FCT Holdings Pty Ltd | Low nox emission burner and operating method for reducing nox formation applied to an iron ore pellet sintering and/or hardening method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104327A (en) * | 1984-05-18 | 1986-12-03 | 金属股份有限公司 | The sclerosis roasting method in the iron ore pellet ore deposit of portable grate |
| JPS6220832A (en) * | 1985-07-17 | 1987-01-29 | Kobe Steel Ltd | Production of iron ore pellet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123332A (en) * | 1980-03-01 | 1981-09-28 | Kobe Steel Ltd | Calcining method for iron ore pellet |
| JPH07116528B2 (en) * | 1989-01-25 | 1995-12-13 | 株式会社神戸製鋼所 | Combustion method of iron ore pellet process |
-
2008
- 2008-07-16 JP JP2008185045A patent/JP2010024477A/en active Pending
-
2009
- 2009-06-15 CN CN200980122179.5A patent/CN102066587B/en active Active
- 2009-06-15 AU AU2009272126A patent/AU2009272126B2/en active Active
- 2009-06-15 UA UAA201101795A patent/UA101209C2/en unknown
- 2009-06-15 BR BRPI0915703-4A patent/BRPI0915703B1/en active IP Right Grant
- 2009-06-15 WO PCT/JP2009/060872 patent/WO2010007849A1/en active Application Filing
- 2009-06-24 TW TW098121218A patent/TWI396750B/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104327A (en) * | 1984-05-18 | 1986-12-03 | 金属股份有限公司 | The sclerosis roasting method in the iron ore pellet ore deposit of portable grate |
| JPS6220832A (en) * | 1985-07-17 | 1987-01-29 | Kobe Steel Ltd | Production of iron ore pellet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484026A (en) * | 2020-12-04 | 2021-03-12 | 鞍钢集团矿业有限公司 | Double-rotational-flow pulverized coal burner and chain grate with same |
Also Published As
| Publication number | Publication date |
|---|---|
| UA101209C2 (en) | 2013-03-11 |
| BRPI0915703A2 (en) | 2015-10-27 |
| TW201005101A (en) | 2010-02-01 |
| BRPI0915703B1 (en) | 2021-05-04 |
| AU2009272126A1 (en) | 2010-01-21 |
| WO2010007849A1 (en) | 2010-01-21 |
| TWI396750B (en) | 2013-05-21 |
| CN102066587B (en) | 2014-09-03 |
| AU2009272126B2 (en) | 2012-08-30 |
| JP2010024477A (en) | 2010-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102066587B (en) | Method for producing iron ore pellets | |
| CN101932738B (en) | Method for producing iron ore pellet | |
| JP5843063B2 (en) | Sintering machine and gaseous fuel supply method | |
| JP2013129895A (en) | Sintering machine and method of supplying gas fuel | |
| JP5544791B2 (en) | Sintering machine | |
| CN104817084B (en) | calcium carbide smelting furnace | |
| CN102305803B (en) | Experiment device and method for studying blast furnace hearth and bottom carbon brick annular crack mechanism | |
| WO2014013775A1 (en) | Method for producing sinter | |
| JP2002081867A (en) | Introducing air control device for metallic oxide reducing furnace | |
| JP5855786B1 (en) | Operation method of waste gasification melting furnace | |
| KR100887153B1 (en) | Method for estimating burning rate based on temperature change of discharge gas in rotary kiln | |
| JP5855785B1 (en) | Operation method of waste gasification melting furnace | |
| KR101657364B1 (en) | Apparatus and method for producting sinter | |
| RU136804U1 (en) | FIRING UNIT WITH HEATED SUPPLY AIR | |
| CN114956611B (en) | Operation method for preventing hardening of materials in chamber of rotary kiln preheater | |
| KR100412225B1 (en) | Apparatus for manufacturing an iron mine sinter and method of it | |
| JP2002157023A (en) | Furnace pressure control system | |
| JP6160839B2 (en) | Oxygen enrichment method for sinter heat-retaining furnace and its heat-retaining furnace | |
| JP5909584B1 (en) | Operation method of waste gasification melting furnace | |
| JP5909583B1 (en) | Operation method of waste gasification melting furnace | |
| JP5410633B1 (en) | Drying apparatus and drying method using the drying apparatus | |
| JP5434340B2 (en) | Method for producing sintered ore | |
| SU960513A1 (en) | Apparatus for heat treatment of chemicometallurgical production industrial products | |
| JP2015075247A (en) | Waste gasification melting furnace and waste gasification melting furnace operation method | |
| JP5549143B2 (en) | Method for manufacturing raw materials for sintering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |