CN106369996A - Novel heat accumulating type tunnel kiln for magnetizing roasting or direct reduction of iron ore - Google Patents
Novel heat accumulating type tunnel kiln for magnetizing roasting or direct reduction of iron ore Download PDFInfo
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- CN106369996A CN106369996A CN201610737522.9A CN201610737522A CN106369996A CN 106369996 A CN106369996 A CN 106369996A CN 201610737522 A CN201610737522 A CN 201610737522A CN 106369996 A CN106369996 A CN 106369996A
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- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/028—Multi-chamber type furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- 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
- C22B1/02—Roasting processes
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- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3044—Furnace regenerators
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- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a novel heat accumulating type tunnel kiln for magnetizing roasting or direct reduction of iron ore. The content of the invention is that (1) in the novel heat accumulating type tunnel kiln, original reverse air suction of the kiln head and kiln tail ends is changed into air suction at one end in the kiln tail direction, and an induced draft fan is not arranged in the kiln head direction; (2) the tunnel kiln from the kiln head to the kiln tail is divided into a roasting section I, a roasting section II and a cooling section, and a preheating section is not arranged; and (3) after flue gas exhausted from all the sections of the tunnel kiln enters a secondary combustion chamber to be burnt, the flue gas is sent into a heat accumulating type heat exchanger for waste heat recycling, and generated hot air is blown into the kiln as a heating heat source and high-temperature combustion-supporting air. According to the novel heat accumulating type tunnel kiln, the purposes that the waste heat of high-temperature flue gas in roasting of an iron ore tunnel kiln is recycled, the energy consumption is reduced, the yield is increased, and the length of a kiln body is shortened are achieved.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology field, it is related to one kind and is used for iron ore magnetizing roast or direct-reduction
New Regenerative tunnel cave.
Background technology
At present, the tunnel kiln direct reduced technique of iron ore be by iron ore concentrate, coal dust, agstone according to certain ratio and
Loading method is respectively charged in reductive jar, then tank is placed on tank car and pushes in bar shaped tunnel cave, or tank is placed directly on ring
In shape annular kiln, batch can, after 1150 DEG C about heating roastings and cooling, obtains DRI.Iron ore coal base tunnel cave is direct
Reducing process has the characteristics that technology maturation, simple to operate, but there is single machine production in iron ore is tunnel kiln direct reduced
The problems such as ability is little, high energy consumption, environmental pollution are serious.
In terms of tunnel kiln type selection, due to the multilamellar cloth of reductive jar on kiln car, the thermal-flame that burner sprays is worn
Thoroughly limited in one's ability, for improving the uniformity of roasting material, the width of tunnel cave is typically narrower.
In the current tunnel kiln direct reduced technique of iron ore, it is that in balance tunnel kiln, the furnace pressure along kiln length direction divides
Cloth, reduces malleation in kiln and burns with anger and negative-pressure air-suction phenomenon, all using the method discharged fume from tunnel cave two ends, because pit coal mixes
(300～500 DEG C) just have fugitive constituent precipitation to coal in compound at a lower temperature, cause tunnel cave to enter the cigarette of kiln end discharge
Certain coal fugitive constituent combustibles are contained, these coal fugitive constituent combustibles can not burn, directly at a lower temperature in gas
Enter air and both cause environmental pollution, energy waste.Additionally, tunnel cave is to reclaim the fume afterheat that feeding end is discharged, typically
It is provided with longer preheating section, cause tunnel cave effective high-temperature roasting time to shorten, production capacity reduces.
In current iron ore tunnel cave roasting process, material heating typically adopts gaseous fuel, for gaseous fuel
The area lacking, iron ore tunnel cave roasting receives certain restriction, generally to tunnel cave gaseous fuelled, needs to join
Gas generator built by set, so that the cost of iron ore tunnel cave roasting improves and brings series of environmental problems.
Content of the invention
The present invention is fully to reclaim more than the high-temperature flue gas discharged in iron ore tunnel cave magnetizing roast or Direct Reduction
Heat, reduction are discharged combustibles content in flue gas, equilibrium kiln length direction furnace pressure distribution, are shortened kiln body length, raising yield, invention
A kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction.
The technical scheme is that a kind of New Regenerative tunnel for iron ore magnetizing roast or direct-reduction
Kiln, original kiln hood, the reverse convulsion in kiln tail two ends are changed to, along kiln tail direction one end convulsion in the same direction, not set air exhauster in kiln hood,
One section, two sections or multistage convulsion be can be designed as according to tunnel cave length；It is divided into one section of roasting, roasting two from kiln hood to kiln tail
Section and cooling section, do not set preheating section, arrange kiln crown screw-down structure in the end of one section of tunnel cave roasting, roasting two-stage nitration, according to need
Multistage kiln crown screw-down structure can be set；The high-temperature flue gas that each furnace zone is discharged are introduced into secondary combustion chamber and are mixed with combustion air
After conjunction, imperfect combustion combustible in high-temperature flue gas is carried out second-time burning, secondary by adjusting coefficient of excess air control
The flue-gas temperature that combustor is discharged, the high-temperature flue gas discharged from secondary combustion chamber, enter back into heat regenerator, regenerative heat-exchange
High-temperature flue-gas can be down to 200 DEG C about by device, and removing dust extracts discharge out by smoke extractor, produce high-temperature hot-air, through storing simultaneously
The high-temperature hot-air that hot type heat exchanger produces, a point upper and lower two-layer blasts one section of tunnel cave roasting, roasting two-stage nitration, the high warm of a part
Wind is fed from kiln car bottom, flow to kiln car top again and carry out profit as combustion air after kiln car bottom is heated
With；Another part high-temperature hot-air is mixed with kiln gas and is utilized directly as combustion air after the infeed of kiln car top；After roasting
High-temperature material enter into cooling section from tunnel cave roasting two-stage nitration, material carries out heat in cooling section with the atomized water spraying into from kiln crown
Exchange, high-temperature material can be made to be cooled to less than 400 DEG C within 15～30min time, the water vapour after atomized water vaporization is from cooling
Section end is discharged, and the material cooling to less than 400 DEG C is discharged from tunnel cave cooling section.
Further, high-temperature hot-air, point upper and lower two-layer, for fashionable, in one section of tunnel cave roasting, feeds kiln car bottom
High-temperature hot-air is more than the high-temperature hot-air amount feeding kiln car top；In tunnel cave roasting two-stage nitration, feed the high warm of kiln car bottom
Wind is less than the high-temperature hot-air amount feeding kiln car top.
Further, in the heat regenerator of one section of tunnel cave roasting and roasting two-stage nitration, heat storage quantity is 3,2
Individual heat storage smoke evacuation, 1 heat storage heat air；Or 5,3 heat storage smoke evacuations, 2 heat storages heat air, heat accumulating type
In heat exchanger, each heat storage is switched over by intervals.
Further, the iron ore concentrate or iron ore reduction coal in proportion after pelletizing or grading, with same particle sizes
Mixed, mixed material is laid on kiln car successively from the bottom up according to the ascending order of granularity, finally exists
Material upper surface tiles one layer of carbon residue or semi-coke, and direct-reduction thickness of feed layer 120～160mm, magnetizing roast thickness of feed layer 60～
90mm.
Further, iron ore is during tunnel cave magnetizing roast, by controlling tunnel cave high-temperature roasting temperature 1000
～1100 DEG C, high-temperature roasting time 60min, can make the fe in iron ore2o3Magnetizing roast is fe3o4.
Further: iron ore during tunnel kiln direct reduced, by control tunnel cave high-temperature roasting temperature 1150
～1250 DEG C, high temperature reduction time 90～120min, can make iron ore be reduced.
The invention has the beneficial effects as follows: 1, in iron ore tunnel cave roasting process, by conventional tunnel kiln kiln hood (is entered
Material end), the reverse convulsion in kiln tail (discharge end) two ends be changed to along kiln tail direction one end convulsion in the same direction, segmented high-temperature smoke evacuation, flue gas two
Secondary combustion technology, solves the environmental issue of tunnel cave it is achieved that the qualified discharge of flue gas；
2nd, kiln car adopts thermophore accumulation of heat recovery waste heat, the technology such as strengthening heating, double-layer heating after entering kiln, shortens tunnel
The length of road kiln, improves the yield of tunnel cave, reduces the roasting cost of iron ore；
3rd, the fuel gas that the fugitive constituent released by the use of coal in pit coal mixture and charcoal gasification are produced is as fuel it is achieved that tunnel
Road kiln carries out iron ore roasting in the case of no outer giving gas.
Brief description
Fig. 1 is the schematic diagram of the present invention.
Specific embodiment
A kind of heat accumulating type tunnel cave, its content of the invention has: compared with (1) is reduced directly tunnel cave with tradition, this new accumulation of heat
Formula tunnel cave original kiln hood (feed end), the reverse convulsion in kiln tail (discharge end) two ends is changed to along kiln tail direction one end is taken out in the same direction
Wind, can be designed as one section, two sections, even multistage convulsion according to tunnel cave length, but is all along kiln tail direction one end convulsion,
Kiln hood (discharge end) does not set air exhauster；(2) New Regenerative tunnel cave be divided into from kiln hood to kiln tail one section of roasting, roasting two-stage nitration and
Cooling section, does not set preheating section, arranges kiln crown screw-down structure in the end of one section of tunnel cave roasting, roasting two-stage nitration, as needed may be used
To arrange multistage kiln crown screw-down structure；High-temperature flue gas that (3) each furnace zone of heat accumulating type tunnel cave is discharged (magnetizing roast 800～
1000 DEG C, 1000～1200 DEG C of direct-reduction), be introduced into after secondary combustion chamber mixed with combustion air, by high-temperature flue gas not
The combustible of burning completely carries out second-time burning, by adjusting the flue-gas temperature that coefficient of excess air controls secondary combustion chamber to discharge
(900～1100 DEG C of magnetizing roast flue-gas temperature, 1150～1250 DEG C of flue-gas temperature of direct-reduction)；Discharge from secondary combustion chamber
High-temperature flue gas, enter back into heat regenerator, and high-temperature flue-gas can be down to 200 DEG C about by heat regenerator, removing dust
Discharge is extracted out by smoke extractor, produce simultaneously high-temperature hot-air (magnetic roasting process high-temperature hot-air temperature up to 800～1000 DEG C, straight
Connect reducing process high-temperature hot-air temperature up to 1000～1100 DEG C).The high-temperature hot-air producing through heat regenerator, divides upper and lower
Two-layer blasts one section of tunnel cave roasting, roasting two-stage nitration as heat source and high temperature combustion supporting air；(4) iron ore concentrate or iron ore are through making
After ball or grading, mixed with the reduction coal in proportion of same particle sizes, mixed material is ascending according to granularity
Order is laid on kiln car successively from the bottom up, finally in material upper surface one layer of carbon residue of tiling or semi-coke, directly also
Raw material layer thickness 120～160mm, magnetizing roast thickness of feed layer 60～90mm；(5) kiln car is pushed into roasting from feed end
One section, during roasting two-stage nitration, the effect of the high temperature combustion supporting air due to blasting, pit coal mixture is gradually heated, waving in coal
Send out part to release, the h in coal fugitive constituent2The iron oxides in the bed of material will be reduced as reducing agent when through the bed of material；Coal fugitive constituent
In Hydrocarbon include the chemical industry product such as methane, benzene, naphthalene discharge the bed of material after, run into high temperature combustion supporting air, conduct in kiln
Fuel combustion.Gradually rising with kiln temperature, there is reduction reaction in pit coal mixture, produce co in the bed of material2、h2The gas such as o
Body, co2、h2The gases such as o occur gasification reaction to produce h with the carbon in the bed of material2, co gas, this gas part is as iron ore
Reducing agent, another part enters in kiln as fuel combustion inside material；(6) iron ore is in tunnel cave magnetizing roast process
In, by controlling 1000～1100 DEG C of tunnel cave high-temperature roasting temperature, high-temperature roasting time 60min, can make in iron ore
Fe2o3Magnetizing roast is fe3o4；Iron ore during tunnel kiln direct reduced, by control tunnel cave high-temperature roasting temperature
1150～1250 DEG C, high temperature reduction time 90～120min, can make iron ore be reduced；(7) in one section of tunnel cave roasting and
In roasting two-stage nitration, a high-temperature hot-air part for feeding is fed from kiln car bottom, flows after kiln car bottom is heated again
Utilized to kiln car top as combustion air；Another part high-temperature hot-air is mixed directly with kiln gas after the infeed of kiln car top
Utilized as combustion air；(8) high-temperature material after roasting enters into cooling section from tunnel cave roasting two-stage nitration, and material is cold
But the atomized water that Duan Yucong kiln crown sprays into carries out heat exchange, can make high-temperature material be cooled within 15～30min time 400 DEG C with
Under, the water vapour after atomized water vaporization is discharged from cooling section end, and the material cooling to less than 400 DEG C is arranged from tunnel cave cooling section
Go out.
Compared with tradition direct-reduction tunnel cave, this New Regenerative tunnel cave is by original kiln hood (feed end), kiln tail
The reverse convulsion in (discharge end) two ends is changed to along kiln tail direction one end convulsion in the same direction, according to tunnel cave length can be designed as one section,
Two sections, even multistage convulsion, but be all along kiln tail direction one end convulsion, do not set air exhauster along kiln hood direction.So design is excellent
Point, one is the fugitive constituent in the reducing agent coal of kiln hood side can be made to be extracted into high temperature section fully burn, and not only improves environmental protection, and permissible
Reduce fuel consumption；Two is can to blast high-temperature hot-air in kiln hood, realizes quick strengthening heating, thus it is pre- to substantially reduce material
The hot time, improve tunnel cave production efficiency.
Tradition direct-reduction tunnel cave setting kiln hood (feed end), the reverse convulsion in kiln tail (discharge end) two ends, kiln hood side
Fugitive constituent in reducing agent coal release after due to kiln temperature relatively low it is impossible to burning, with fume emission in air, be both unfavorable for
Environmental protection, wastes the energy again.Heat accumulating type tunnel cave is changed to along kiln tail one end convulsion, and is provided with secondary combustion chamber, will originally from
The flue gas that kiln hood side is extracted out is extracted into tunnel cave high temperature section, and because tunnel cave high temperature section temperature is higher, in the flue gas of extraction, it can
Combustion composition can burn, and imperfect combustion part combustible is sent to waste heat boiler again after also being burnt by secondary combustion chamber and enters
Row waste heat recovery, the flue gas after cooling is directly discharged into air after removing dust again.Not only improve environmental protection, fuel can be reduced again and disappear
Consumption.
The present invention is to improve tunnel cave yield, by high-temperature hot-air after the top of kiln car and bottom feed, can be
Kiln cross direction forms a stronger flow perturbation field, so that the temperature homogeneity of kiln cross direction is improved, tunnel cave can have relatively
Wide width selects.
Kiln car after feed end enters into one section of roasting, in the heating of one section of high-temperature hot-air of roasting and high-temperature flue gas
Under, achievable material enters more than 800 DEG C quick strengthening heating after kiln.Meanwhile, in one section of tunnel cave roasting, feed kiln car bottom
High-temperature hot-air be more than feed kiln car top high-temperature hot-air amount, can strengthen kiln car bottom heating while, make coal in kiln car
In charcoal, the quick volatilization of fugitive constituent and gasification reaction are quickly carried out, for providing gaseous fuel in kiln；In tunnel cave roasting two-stage nitration,
The high-temperature hot-air feeding kiln car bottom is less than the high-temperature hot-air amount feeding kiln car top, can be while strengthening kiln fuel combustion
Improve the kiln temperature of tunnel cave, thus improving the reduction rate of iron ore.
In one section of tunnel cave roasting, the heat regenerator of roasting two-stage nitration setting, heat storage quantity is 3 (2 accumulation of heats
Body smoke evacuation, 1 heat storage heat air) or 5 (3 heat storage smoke evacuations, 2 heat storages heat air), each regenerative heat-exchange
In device, heat storage is switched over by intervals, can reduce the fluctuation of furnace pressure in heat regenerator handoff procedure, simultaneously
Be conducive to the normal smoke evacuation of tunnel cave.
Indoor in tunnel cave second-time burning, after high-temperature flue gas are mixed with the normal temperature air that aerator blasts, empty by controlling
Gas coefficient of excess, controls flue-gas temperature (900～1100 DEG C of magnetizing roast flue-gas temperature, direct-reduction flue gas temperature after second-time burning
1150～1250 DEG C of degree), realize the burning completely of combustibles in high-temperature flue gas, protect heat regenerator simultaneously.
Embodiment 1
The present embodiment is the heat accumulating type tunnel cave of iron ore direct reducing.
Iron ore adopts 8～16mm pellet, and reducing agent adopts 5～15mm coal, and anti-oxidation coverture adopts glass phase
Material, bottom is enclosed coal and is adopted 0～5mm coal, and capping charcoal adopts the relatively low 5～15mm carbon residue of volatile matters or semi-coke, coke.
1st, mixed material preparation
After 8～16mm pellet is carried out dispensing and mixed in 100:12～16 ratio with 5～15mm reduction coal, make mixing
Material.
2nd, kiln car cloth
After on kiln car, laying depth 10～15mm encloses coal in bottom, mixed material is laid on the kiln car of tunnel cave, paving
If THICKNESS CONTROL is 120～160mm, tiling a layer thickness 10～20mm, the capping of granularity 5～15mm on mixed material
Charcoal, finally cover on kiln car capping charcoal one layer of granularity be 2～5mm, thickness be 10～25mm coverture.
3rd, tunnel cave material roasting
Kiln car equipped with material enters from tunnel cave feeding end, and in moving process in tunnel cave, material is gradually heated kiln car
And roasting, by controlling 1150～1250 DEG C of tunnel cave high-temperature roasting temperature, high temperature reduction time 90～120min, iron mine can be made
Stone is reduced.
Iron ore in reduction process in tunnel cave, in coal release fugitive constituent and charcoal gasification produce gas, one
Gas is divided to be utilized as reduction of iron ore gas, another part gas enters into kiln space as fuel inside material
Utilized.
In one section of tunnel cave roasting and roasting two-stage nitration, a high-temperature hot-air part for feeding feeds from kiln car bottom, to kiln
Car bottom flow to kiln car top again after being heated and is utilized as combustion air；Another part high-temperature hot-air is from kiln car
Portion feeds as combustion air, with kiln gas mixed combustion.
4th, the second-time burning of tunnel kiln smoke-gas and waste heat recovery
Enter after secondary combustion chamber is mixed with combustion air from the flue gas that one section of tunnel cave roasting, roasting two-stage nitration are discharged and fired
Burn, control flue gas to go out second-time burning room temperature for 1150～1250 DEG C by adjusting coefficient of excess air.The secondary combustion of high-temperature flue gas
Deliver to after burning and in heat regenerator, carry out waste heat recovery, arranged by smoke extractor after 200 DEG C about flue gas removing dust device dedustings of cooling
Enter air, be warmed up to 1000～1100 DEG C of high-temperature hot-airs and deliver to each section of tunnel cave and utilized.
5th, the cooling of tunnel cave roasting material
High-temperature material after tunnel cave roasting enters into cooling section from roasting two-stage nitration, and material is in cooling section and the mist spraying into from kiln crown
Change water and carry out heat exchange, material can be made to be cooled to less than 400 DEG C within 15～30min time, the water vapour after atomized water vaporization
Discharge from cooling section end, the material cooling to less than 400 DEG C is discharged from tunnel cave cooling section.
Embodiment 2
The present embodiment is the heat accumulating type tunnel cave of iron ore magnetizing roast.
Iron ore using granularity be 0～1mm, the oxide ore of 1～5mm, 5～15mm, reducing agent using and iron ore granularity
Scope identical coal, bottom is enclosed coal and is adopted 0～5mm coal, capping charcoal adopt the relatively low 5～15mm carbon residue of volatile matters or semi-coke,
Coke.
1st, mixed material preparation
By 0～1mm, 1～5mm, 5～15mm iron ore respectively with 0～1mm, 1～5mm, 5～15mm reduction coal press 100:1～
After 3 ratios carry out dispensing and mixing, make each grade mixed material.
2nd, kiln car cloth
After on kiln car, laying depth 10～15mm encloses coal in bottom, by each grade mixed material according to granularity by little arrival
Order is laid on kiln car from lower to upper successively, and laying gross thickness is controlled to 60～90mm, finally tiles on mixed material
A layer thickness 10～20mm, granularity 5～15mm capping charcoal.
3rd, tunnel cave material roasting
Kiln car equipped with material enters from tunnel cave feeding end, and in moving process in tunnel cave, material is gradually heated kiln car
And roasting, by controlling 1000～1100 DEG C of tunnel cave high-temperature roasting temperature, high-temperature roasting time 60min, iron mine can be made
Stone is magnetized.
Iron ore in roasting process in tunnel cave, in coal release fugitive constituent and charcoal gasification produce gas, one
Gas is divided to be utilized as reduction of iron ore gas, another part gas enters into kiln space from material and enters as fuel
Row utilizes.
In one section of tunnel cave roasting and roasting two-stage nitration, a high-temperature hot-air part for feeding is fed from kiln car bottom,
It flow to kiln car top after kiln car bottom is heated again to utilize as combustion air；Another part high-temperature hot-air is from kiln
Mix with kiln gas after the infeed of car top and utilized as combustion air.
4th, the second-time burning of tunnel kiln smoke-gas and waste heat recovery
Enter after secondary combustion chamber is mixed with combustion air from the flue gas that one section of tunnel cave roasting, roasting two-stage nitration are discharged and fired
Burn, control flue gas to go out second-time burning room temperature for 900～1100 DEG C by adjusting coefficient of excess air.High-temperature flue gas second-time burning
After deliver in heat regenerator and carry out waste heat recovery, arranged by smoke extractor after cooling to 200 DEG C about flue gas removing dust device dedustings
Enter air, be warmed up to 800～1000 DEG C about high-temperature hot-airs and deliver to each section of tunnel cave and utilized.
5th, the cooling of tunnel cave roasting material
Cooling section is entered into from tunnel cave roasting two-stage nitration, material is in cooling section and the atomization spraying into from kiln crown after high-temperature material roasting
Water carries out heat exchange, and high-temperature material can be made to be cooled to less than 400 DEG C within 15～30min time, and the water after atomized water vaporization steams
Vapour is discharged from cooling section end, and the material cooling to less than 400 DEG C is discharged from tunnel cave cooling section.
Claims (6)
1. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction, is characterized in that: by original kiln
Head, the reverse convulsion in kiln tail two ends are changed to, along kiln tail direction one end convulsion in the same direction, not set air exhauster in kiln hood, according to tunnel cave length
Can be designed as one section, two sections or multistage convulsion；It is divided into one section of roasting, roasting two-stage nitration and cooling section from kiln hood to kiln tail, do not set
Preheating section, arranges kiln crown screw-down structure in the end of one section of tunnel cave roasting, roasting two-stage nitration, can arrange multistage kiln as needed
Top screw-down structure；The high-temperature flue gas that each furnace zone is discharged are introduced into after secondary combustion chamber mixed with combustion air, by high-temperature flue gas
In imperfect combustion combustible carry out second-time burning, by adjust coefficient of excess air control secondary combustion chamber discharge flue gas
Temperature, the high-temperature flue gas discharged from secondary combustion chamber, enter back into heat regenerator, heat regenerator can be by high-temperature flue gas temperature
Degree is down to 200 DEG C about, and removing dust extracts discharge out by smoke extractor, produces high-temperature hot-air simultaneously, produces through heat regenerator
High-temperature hot-air, a point upper and lower two-layer blasts one section of tunnel cave roasting, roasting two-stage nitration, and a part of high-temperature hot-air is carried out from kiln car bottom
Feed, flow to kiln car top after kiln car bottom is heated again and utilize as combustion air；The high warm of another part
Wind is mixed with kiln gas and is utilized directly as combustion air after the infeed of kiln car top；High-temperature material after roasting is from tunnel cave
Roasting two-stage nitration enters into cooling section, and material carries out heat exchange in cooling section with the atomized water spraying into from kiln crown, can make high-temperature material
It is cooled to less than 400 DEG C within 15～30min time, the water vapour after atomized water vaporization is discharged from cooling section end, cools to
Less than 400 DEG C of material is discharged from tunnel cave cooling section.
2. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction according to claim 1,
It is characterized in that: it is fashionable that high-temperature hot-air divides upper and lower two-layer to supply, in one section of tunnel cave roasting, feed the high-temperature hot-air of kiln car bottom
More than the high-temperature hot-air amount feeding kiln car top；In tunnel cave roasting two-stage nitration, the high-temperature hot-air feeding kiln car bottom is less than confession
Enter the high-temperature hot-air amount on kiln car top.
3. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction according to claim 1,
It is characterized in that: in the heat regenerator of one section of tunnel cave roasting and roasting two-stage nitration, heat storage quantity is 3,2 heat storages
Smoke evacuation, 1 heat storage heat air；Or 5,3 heat storage smoke evacuations, 2 heat storages heat air, in heat regenerator
Each heat storage is switched over by intervals.
4. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction according to claim 1,
It is characterized in that: iron ore concentrate or iron ore, after pelletizing or grading, are mixed with the reduction coal in proportion of same particle sizes,
Mixed material is laid on kiln car successively from the bottom up according to the ascending order of granularity, finally in material upper surface
One layer of carbon residue of tiling or semi-coke, direct-reduction thickness of feed layer 120～160mm, magnetizing roast thickness of feed layer 60～90mm.
5. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction according to claim 1,
It is characterized in that: iron ore during tunnel cave magnetizing roast, by control 1000～1100 DEG C of tunnel cave high-temperature roasting temperature,
High-temperature roasting time 60min about, the fe in iron ore can be made2o3Magnetizing roast is fe3o4.
6. a kind of New Regenerative tunnel cave for iron ore magnetizing roast or direct-reduction according to claim 1,
It is characterized in that: iron ore during tunnel kiln direct reduced, by control 1150～1250 DEG C of tunnel cave high-temperature roasting temperature,
High temperature reduction time 90～120min, can make iron ore be reduced.
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| CN111238223A (en) * | 2020-04-01 | 2020-06-05 | 白承国 | Natural convection technology for hot gas in tunnel kiln |
| CN113624003A (en) * | 2021-07-19 | 2021-11-09 | 酒泉钢铁(集团)有限责任公司 | Heat accumulating type tunnel kiln for flue gas backflow and high-temperature section smoke exhaust and roasting process |
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| CN106369996B (en) | 2018-07-24 |
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