CN106369996B - A kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction - Google Patents
A kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction Download PDFInfo
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- CN106369996B CN106369996B CN201610737522.9A CN201610737522A CN106369996B CN 106369996 B CN106369996 B CN 106369996B CN 201610737522 A CN201610737522 A CN 201610737522A CN 106369996 B CN106369996 B CN 106369996B
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Classifications
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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
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- 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
Abstract
The present invention relates to a kind of New Regenerative tunnel oven for iron ore magnetizing roast or direct-reduction, invention content has：（1）Original kiln hood, the reversed exhausting in kiln tail both ends are changed to, along kiln tail direction one end exhausting in the same direction, exhaust fan not set along kiln hood direction by the New Regenerative tunnel oven；（2）It is divided into one section of roasting, roasting two sections and cooling section from kiln hood to kiln tail, does not set preheating section；（3）It after the flue gas of each section of discharge of tunnel oven enters secondary combustion chamber burning, is sent in heat regenerator and carries out waste heat recovery, the hot wind of generation blasts again is used as heat source and high temperature combustion supporting air in kiln.The purpose that high-temperature flue gas waste heat recovery, energy consumption reduction, output increased and kiln body length in being roasted invention achieves iron ore tunnel oven are shortened.
Description
Technical field
The invention belongs to metallurgical and mineral engineering technology fields, are related to a kind of for iron ore magnetizing roast or direct-reduction
New Regenerative tunnel oven.
Background technology
Currently, the tunnel kiln direct reduced technique of iron ore be by iron ore concentrate, coal dust, agstone according to a certain percentage and
Loading method is respectively charged into reductive jar, and then tank is placed on tank car and is pushed into bar shaped tunnel oven, or tank is placed directly on ring
In shape annular kiln, batch can obtains direct reduced iron after 1150 DEG C or so heating roastings and cooling.Iron ore coal base tunnel oven is direct
Reducing process has the characteristics that technology maturation, easy to operate, but there is single machine productions in iron ore is tunnel kiln direct reduced
Ability is small, high energy consumption, serious environmental pollution the problems such as.
In terms of tunnel kiln type selection, due to the multilayer cloth of reductive jar on kiln car, the thermal-flame that burner sprays is worn
Saturating ability is limited, and to improve the uniformity of roasting material, the width of tunnel oven is generally relatively narrow.
It is the furnace pressure point in balance tunnel kiln along kiln length direction in the current tunnel kiln direct reduced technique of iron ore
Cloth reduces positive pressure in kiln and burns with anger and negative-pressure air-suction phenomenon, be all made of the method discharged fume from tunnel oven both ends, since pit coal is mixed
Coal in conjunction object is at a lower temperature（300~500 DEG C）Fugitive constituent precipitation is just had, tunnel oven is caused to enter the cigarette of kiln end discharge
Contain certain coal fugitive constituent combustibles in gas, these coal fugitive constituent combustibles cannot burn at a lower temperature, directly
It is discharged into air and had both caused environmental pollution, energy waste.In addition, tunnel oven is the fume afterheat for recycling feeding end discharge, generally
Equipped with longer preheating section, tunnel oven effective high-temperature roasting time is caused to shorten, production capacity reduction.
In current iron ore tunnel oven roasting process, material heating generally uses gaseous fuel, for gaseous fuel
The area of shortage, the roasting of iron ore tunnel oven receive certain limitation, generally to tunnel oven gaseous fuelled, need to match
Set builds gas generator, to make the cost that iron ore tunnel oven roasts improve and bring a series of environmental problems.
Invention content
The present invention is fully to recycle more than the high-temperature flue gas being discharged in the magnetizing roast of iron ore tunnel oven or Direct Reduction
Heat reduces combustibles content in discharge flue gas, balanced kiln length direction furnace pressure distribution, shortens kiln body length, improves yield, invention
A kind of New Regenerative tunnel oven for iron ore magnetizing roast or direct-reduction.
The technical scheme is that：A kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction, will
Kiln hood originally, the reversed exhausting in kiln tail both ends are changed to, along kiln tail direction one end exhausting in the same direction, exhaust fan not set in kiln hood, according to tunnel
Road kiln length can be designed as one section, two sections or multistage exhausting；It is divided into one section of roasting, roasting two sections and cold from kiln hood to kiln tail
But section does not set preheating section, roasts one section in tunnel oven, kiln top pressure lower structure is arranged in the end that roasts two sections, as needed can be with
The multistage kiln top pressure lower structure of setting；The high-temperature flue gas of each furnace zone discharge is introduced into after secondary combustion chamber mixes with combustion air,
Combustible imperfect combustion in high-temperature flue gas is subjected to second-time burning, secondary combustion chamber is controlled by adjusting coefficient of excess air
The flue-gas temperature of discharge, the high-temperature flue gas being discharged from secondary combustion chamber enter back into heat regenerator, and heat regenerator can incite somebody to action
High-temperature flue-gas is down to 200 DEG C or so, is extracted out and is discharged by smoke extractor through dedusting, while generating high-temperature hot-air, changed through heat accumulating type
The high-temperature hot-air that hot device generates blasts tunnel oven point upper and lower two layers and roasts one section, two sections of roasting, and a part of high-temperature hot-air is from kiln
Vehicle lower part is fed, and flowing to kiln car top again as combustion air after being heated to kiln car lower part utilizes；It is another
Part high-temperature hot-air is mixed with kiln gas after being fed from kiln car top and is utilized directly as combustion air；High temperature substrate after roasting
Material roasts two sections from tunnel oven and enters cooling section, and material carries out heat exchange in cooling section with the atomized water entered from kiln top spray, can
High-temperature material is set to be cooled to 400 DEG C within 15~30min times hereinafter, the water vapour after atomized water vaporization is arranged from cooling section end
Go out, cools to 400 DEG C of materials below and be discharged from tunnel oven cooling section.
Further, high-temperature hot-air divides upper and lower two layers for fashionable, is roasted in one section in tunnel oven, feed kiln car lower part
High-temperature hot-air is more than the high-temperature hot-air amount for feeding kiln car top；It is roasted in two sections in tunnel oven, feeds the high warm of kiln car lower part
Wind is less than the high-temperature hot-air amount for feeding kiln car top.
Further, in tunnel oven roasts one section and roasts two sections of heat regenerator, heat storage quantity is 3,2
A heat storage smoke evacuation, 1 heat storage heat air；Or 5,3 heat storage smoke evacuations, 2 heat storages heat air, and heat accumulating type changes
Each heat storage is switched over by intervals in hot device.
Further, iron ore concentrate or iron ore are after pelletizing or grading, the reduction coal in proportion with same particle sizes
It is mixed, mixed material is laid on kiln car from the bottom up successively according to the ascending sequence of granularity, is finally existed
Tile one layer of carbon residue or semi-coke for material upper surface, and 120~160mm of direct-reduction thickness of feed layer, magnetizing roast thickness of feed layer 60~
90mm。
Further, iron ore is during tunnel oven magnetizing roast, by controlling tunnel oven high-temperature roasting temperature 1000
~1100 DEG C, high-temperature roasting time 60min or so, can make the Fe in iron ore2O3Magnetizing roast is Fe3O4。
Further,：Iron ore is during tunnel kiln direct reduced, by controlling tunnel oven high-temperature roasting temperature 1150
~1250 DEG C, 90~120min of high temperature reduction time, can be such that iron ore is restored.
The beneficial effects of the invention are as follows：1, in iron ore tunnel oven roasting process, by by conventional tunnel kiln kiln hood（Into
Expect end）, kiln tail（Discharge end）The reversed exhausting in both ends is changed to along kiln tail direction one end exhausting in the same direction, segmented high-temperature smoke evacuation, flue gas two
Secondary combustion technology solves the environmental issue of tunnel oven, realizes the qualified discharge of flue gas；
2, kiln car uses storage heater accumulation of heat recovery waste heat after entering kiln, strengthens the technologies such as heating, double-layer heating, shortens
The length of tunnel oven, improves the yield of tunnel oven, reduces the roasting cost of iron ore；
3, the fuel gas that the fugitive constituent and charcoal gasification released using coal in pit coal mixture are generated is realized as fuel
Tunnel oven is carrying out iron ore roasting without giving gas outside.
Description of the drawings
Fig. 1 is the schematic diagram of the present invention.
Specific implementation mode
A kind of heat accumulating type tunnel oven, invention content have：（1）Compared with tradition is reduced directly tunnel oven, the novel accumulation of heat
Formula tunnel oven is by original kiln hood（Feed end）, kiln tail（Discharge end）The reversed exhausting in both ends is changed to take out along kiln tail direction one end in the same direction
Wind can be designed as one section, two sections, even multistage exhausting according to tunnel oven length, but be all along kiln tail direction one end exhausting,
Kiln hood（Discharge end）Do not set exhaust fan；（2）New Regenerative tunnel oven be divided into from kiln hood to kiln tail roasting one section, roasting two sections and
Cooling section does not set preheating section, in the end setting kiln top pressure lower structure that tunnel oven roasts one section, roasts two sections, as needed may be used
With the multistage kiln top pressure lower structure of setting；（3）The high-temperature flue gas of each furnace zone discharge of heat accumulating type tunnel oven（Magnetizing roast 800~
1000 DEG C, 1000~1200 DEG C of direct-reduction）, be introduced into after secondary combustion chamber mixes with combustion air, by high-temperature flue gas not
The combustible of completely burned carries out second-time burning, and the flue-gas temperature of secondary combustion chamber discharge is controlled by adjusting coefficient of excess air
（1150~1250 DEG C 900~1100 DEG C of magnetizing roast flue-gas temperature, direct-reduction of flue-gas temperature）；It is discharged from secondary combustion chamber
High-temperature flue gas enters back into heat regenerator, and high-temperature flue-gas can be down to 200 DEG C or so by heat regenerator, through dedusting
It is extracted out and is discharged by smoke extractor, while generating high-temperature hot-air（Magnetic roasting process high-temperature hot-air temperature up to 800~1000 DEG C, it is straight
Reducing process high-temperature hot-air temperature is connect up to 1000~1100 DEG C）.The high-temperature hot-air generated through heat regenerator divides upper and lower
Blast for two layers tunnel oven roast one section, two sections of roasting be used as heat source and high temperature combustion supporting airs；（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
Sequence is laid on kiln car from the bottom up successively, finally in material upper surface one layer of carbon residue of tiling or semi-coke, directly also
120~160mm of raw material layer thickness, 60~90mm of magnetizing roast thickness of feed layer；（5）Kiln car is pushed into roasting from feed end
One section, roasting two sections during, due to the effect of the high temperature combustion supporting air blasted, pit coal mixture is gradually heated, waving in coal
It sends out part to release, the H in coal fugitive constituent2It will be used as reducing agent when across the bed of material, restore the ferriferous oxide in the bed of material；Coal fugitive constituent
In hydrocarbon include the chemical industry such as methane, benzene, naphthalene product after the bed of material is discharged, encounter high temperature combustion supporting air, the conduct in kiln
Fuel combustion.With gradually rising for kiln temperature, pit coal mixture occurs reduction reaction, CO is generated in the bed of material2、H2The gas such as O
Body, CO2、H2The gases such as O occur gasification reaction with the carbon in the bed of material and generate H2, CO gases, the gas part is as iron ore
Reducing agent, another part enters inside material is used as fuel combustion in kiln；（6）Iron ore is in tunnel oven magnetizing roast process
In, by controlling 1000~1100 DEG C of tunnel oven high-temperature roasting temperature, high-temperature roasting time 60min or so, can make in iron ore
Fe2O3Magnetizing roast is Fe3O4；Iron ore is during tunnel kiln direct reduced, by controlling tunnel oven high-temperature roasting temperature
1150~1250 DEG C, 90~120min of high temperature reduction time, can be such that iron ore is restored；（7）Tunnel oven roast one section and
In two sections of roasting, a high-temperature hot-air part for feeding is fed from kiln car lower part, is flowed again after being heated to kiln car lower part
It is utilized to kiln car top as combustion air；Another part high-temperature hot-air mixes directly after being fed from kiln car top with kiln gas
It is utilized as combustion air；（8）High-temperature material after roasting roasts two sections from tunnel oven and enters cooling section, and material is cold
But Duan Yucong kilns top spray enters atomized water carries out heat exchange, can make high-temperature material be cooled within 15~30min times 400 DEG C with
Under, the water vapour after atomized water vaporization is discharged from cooling section end, cools to 400 DEG C of materials below and is arranged from tunnel oven cooling section
Go out.
Compared with tradition is reduced directly tunnel oven, the New Regenerative tunnel oven is by original kiln hood（Feed end）, kiln tail
（Discharge end）The reversed exhausting in both ends is changed to along kiln tail direction one end exhausting in the same direction, according to tunnel oven length can be designed as one section,
Two sections, even multistage exhausting, but be all not set exhaust fan along kiln hood direction along kiln tail direction one end exhausting.That designs in this way is excellent
Point fully burns first, the fugitive constituent in the reducing agent coal of kiln hood side can be made to be extracted into high temperature section, not only improves environmental protection, and can be with
Reduce fuel consumption；Second is that high-temperature hot-air can be blasted in kiln hood, realizes and quickly strengthen heating, it is pre- to substantially reduce material
The hot time improves tunnel oven production efficiency.
Kiln hood is arranged in tradition direct-reduction tunnel oven（Feed end）, kiln tail（Discharge end）The reversed exhausting in both ends, kiln hood side
Since kiln temperature is relatively low after fugitive constituent releasing in reducing agent coal, it can not burn, in flue gas emission to air, both be unfavorable for
Environmental protection, and waste the energy.Heat accumulating type tunnel oven is changed to along kiln tail one end exhausting, and be provided with secondary combustion chamber, will originally from
The flue gas of kiln hood side extraction is extracted into tunnel oven high temperature section, and since tunnel oven high temperature section temperature is higher, its in the flue gas of extraction can
Combustion composition can burn, imperfect combustion part combustible be sent to again after can also being burnt by secondary combustion chamber waste heat boiler into
Row waste heat recovery, the flue gas after cooling are directly discharged into air after dedusting again.Environmental protection is not only improved, and fuel can be reduced and disappeared
Consumption.
The present invention is to improve tunnel oven yield, can be after high-temperature hot-air is fed from the top of kiln car and lower part
Kiln wide direction formed a stronger flow perturbation field, so that the temperature uniformity of kiln wide direction is improved, tunnel oven can have compared with
Wide width selection.
Kiln car is after feed end enters one section of roasting, in the heating for roasting one section of high-temperature hot-air and high-temperature flue gas
Down, it can be achieved that material enters 800 DEG C or more quickly reinforcing heating after kiln.Meanwhile being roasted in one section in tunnel oven, feed kiln car lower part
High-temperature hot-air be more than the high-temperature hot-air amount for feeding kiln car top, coal in kiln car can be made while strengthening kiln car lower part and heating
Quickly volatilization and gasification reaction quickly carry out fugitive constituent in charcoal, to provide gaseous fuel in kiln；It is roasted in two sections in tunnel oven,
The high-temperature hot-air for feeding kiln car lower part is less than the high-temperature hot-air amount for feeding kiln car top, can be while strengthening kiln fuel combustion
The kiln temperature for improving tunnel oven, to improve the reduction rate of iron ore.
In tunnel oven roasts one section, roasts the heat regenerators of two sections of settings, 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
Heat storage is switched over by intervals in device, can reduce the fluctuation of furnace pressure in heat regenerator handoff procedure, simultaneously
Be conducive to the normal smoke evacuation of tunnel oven.
It is empty by controlling after high-temperature flue gas is mixed with the normal temperature air that air blower blasts in tunnel oven second-time burning room
Gas coefficient of excess controls flue-gas temperature after second-time burning（900~1100 DEG C of magnetizing roast flue-gas temperature, direct-reduction flue gas temperature
1150~1250 DEG C of degree）, realize the completely burned of combustibles in high-temperature flue gas, while protecting heat regenerator.
Embodiment 1
The present embodiment is the heat accumulating type tunnel oven of iron ore direct reducing.
Iron ore uses 8~16mm pellets, reducing agent that 5~15mm coals, anti-oxidation coverture is used to use glass phase
Material, bottom enclose coal and 0~5mm coals, capping charcoal are used to use the lower 5~15mm carbon residues of volatile matter or semi-coke, coke.
1, prepared by mixed material
8~16mm pellets and 5~15mm reduction coals are pressed 100:After 12~16 ratios carry out dispensing and mixing, it is made
Mixed material.
2, kiln car cloth
After 10~15mm of laying depth encloses coal in bottom on kiln car, mixed material is laid on to the kiln car of tunnel oven
On, laying depth control is 120~160mm, tile on mixed material a layer thickness 10~20mm, 5~15mm of granularity
Capping charcoal, finally on kiln car capping charcoal cover one layer of granularity be 2~5mm, the coverture that thickness is 10~25mm.
3, tunnel oven material roasts
Kiln car equipped with material enters from tunnel oven feeding end, and kiln car is in tunnel oven in moving process, the gradual quilt of material
Heating and roasting can be made by controlling 1150~1250 DEG C of tunnel oven high-temperature roasting temperature, 90~120min of high temperature reduction time
Iron ore is restored.
Iron ore is in tunnel oven in reduction process, the gas that fugitive constituent and the charcoal gasification released in coal generates, one
Gas is divided to be utilized as reduction of iron ore gas, another part gas enters kiln space as fuel inside material
It is utilized.
It is roasted in one section and two sections of roasting in tunnel oven, a high-temperature hot-air part for feeding is fed from kiln car lower part, to kiln
Vehicle lower part flow to kiln car top after being heated and is utilized as combustion air again；Another part high-temperature hot-air is from kiln car
Portion, which is fed, is used as combustion air, is mixed and burned with kiln gas.
4, the second-time burning and waste heat recovery of tunnel kiln smoke-gas
Enter after secondary combustion chamber is mixed with combustion air from the flue gases of two sections of one section of tunnel oven roasting, roasting discharges and carries out
Burning is 1150~1250 DEG C by adjusting coefficient of excess air and controlling flue gas to go out second-time burning room temperature.High-temperature flue gas is secondary
It is sent to after burning in heat regenerator and carries out waste heat recovery, 200 DEG C or so flue gases of cooling are after deduster dedusting by smoke extractor
It is discharged into air, 1000~1100 DEG C of high-temperature hot-airs is warming up to and is sent to each section of tunnel oven and utilized.
5, the cooling of tunnel oven roasting material
High-temperature material after tunnel oven roasting enters cooling section for two sections from roasting, and material enters in cooling section with from kiln top spray
Atomized water carry out heat exchange, can make material be cooled within 15~30min times 400 DEG C hereinafter, atomized water vaporization after water
Steam is discharged from cooling section end, cools to 400 DEG C of materials below and is discharged from tunnel oven cooling section.
Embodiment 2
The present embodiment is the heat accumulating type tunnel oven of iron ore magnetizing roast.
Iron ore uses granularity for the oxide ore of 0~1mm, 1~5mm, 5~15mm, and reducing agent uses and iron ore granularity
The identical coal of range, bottom enclose coal and use 0~5mm coals, capping charcoal using the lower 5~15mm carbon residues of volatile matter or semi-coke,
Coke.
1, prepared by mixed material
0~1mm, 1~5mm, 5~15mm iron ores are pressed with 0~1mm, 1~5mm, 5~15mm reduction coals respectively
100:After 1~3 ratio carries out dispensing and mixing, each grade mixed material is made.
2, kiln car cloth
After 10~15mm of laying depth encloses coal in bottom on kiln car, by each grade mixed material according to granularity by it is small to
The sequence reached is laid on kiln car successively from lower to upper, and it is 60~90mm to be laid with overall thickness control, finally on mixed material
10~20mm of a layer thickness that tiles, granularity 5~15mm capping charcoals.
3, tunnel oven material roasts
Kiln car equipped with material enters from tunnel oven feeding end, and kiln car is in tunnel oven in moving process, the gradual quilt of material
Heating and roasting can be made by controlling 1000~1100 DEG C of tunnel oven high-temperature roasting temperature, high-temperature roasting time 60min or so
Iron ore is magnetized.
Iron ore is in tunnel oven in roasting process, the gas that fugitive constituent and the charcoal gasification released in coal generates, one
Point gas is utilized as reduction of iron ore gas, another part gas entered from material kiln space as fuel into
Row utilizes.
It being roasted in one section and two sections of roasting in tunnel oven, a high-temperature hot-air part for feeding is fed from kiln car lower part,
Kiln car top is flow to again after heating kiln car lower part as combustion air to utilize；Another part high-temperature hot-air is from kiln
Vehicle top mixes with kiln gas after feeding and is utilized as combustion air.
4, the second-time burning and waste heat recovery of tunnel kiln smoke-gas
Enter after secondary combustion chamber is mixed with combustion air from the flue gases of two sections of one section of tunnel oven roasting, roasting discharges and carries out
Burning is 900~1100 DEG C by adjusting coefficient of excess air and controlling flue gas to go out second-time burning room temperature.The secondary combustion of high-temperature flue gas
It is sent to after burning in heat regenerator and carries out waste heat recovery, cool to 200 DEG C or so flue gases after deduster dedusting by smoke extractor
It is discharged into air, 800~1000 DEG C or so high-temperature hot-airs is warming up to and is sent to each section of tunnel oven and utilized.
5, the cooling of tunnel oven roasting material
Roast two sections from tunnel oven after high-temperature material roasting and enter cooling section, material cooling section with enter from kiln top spray
Atomized water carries out heat exchange, and high-temperature material can be made to be cooled to 400 DEG C within 15~30min times hereinafter, after atomized water vaporization
Water vapour is discharged from cooling section end, cools to 400 DEG C of materials below and is discharged from tunnel oven cooling section.
Claims (6)
1. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction, it is characterized in that：By original kiln hood, kiln
The reversed exhausting in tail both ends is changed to, along kiln tail direction one end exhausting in the same direction, exhaust fan not set in kiln hood, can be with according to tunnel oven length
It is designed as one section, two sections or multistage exhausting；It is divided into one section of roasting, roasting two sections and cooling section from kiln hood to kiln tail, does not set preheating
Section, in the end setting kiln top pressure lower structure that tunnel oven roasts one section, roasts two sections；The high-temperature flue gas of each furnace zone discharge is advanced
Enter after secondary combustion chamber mixes with combustion air, combustible imperfect combustion in high-temperature flue gas is subjected to second-time burning, is passed through
The flue-gas temperature for adjusting coefficient of excess air control secondary combustion chamber discharge, from the high-temperature flue gas of secondary combustion chamber discharge, then into
Enter heat regenerator, high-temperature flue-gas can be down to 200 DEG C or so by heat regenerator, extracted out and arranged by smoke extractor through dedusting
It puts, while generating high-temperature hot-air, the high-temperature hot-air generated through heat regenerator divides upper and lower two layers and blasts tunnel oven roasting one
Section, two sections of roasting, a part of high-temperature hot-air is fed from kiln car lower part, and kiln car is flow to again after being heated to kiln car lower part
Top is utilized as combustion air；Another part high-temperature hot-air is mixed with kiln gas after being fed from kiln car top directly as helping
Combustion air is utilized；High-temperature material after roasting roasts two sections from tunnel oven and enters cooling section, material cooling section with from
The atomized water that kiln top spray enters carries out heat exchange, and high-temperature material can be made to be cooled to 400 DEG C within 15~30min times hereinafter, atomization
Water vapour after water vapor is discharged from cooling section end, cools to 400 DEG C of materials below and is discharged from tunnel oven cooling section.
2. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction according to claim 1, special
Sign is：High-temperature hot-air divides upper and lower two layers for fashionable, is roasted in one section in tunnel oven, the high-temperature hot-air for feeding kiln car lower part is more than
Feed the high-temperature hot-air amount on kiln car top；It is roasted in two sections in tunnel oven, the high-temperature hot-air for feeding kiln car lower part is less than infeed kiln
The high-temperature hot-air amount on vehicle top.
3. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction according to claim 1, special
Sign is：In tunnel oven roasts one section and roasts two sections of heat regenerator, heat storage quantity is 3,2 heat storage rows
Cigarette, 1 heat storage heat air；Or 5,3 heat storage smoke evacuations, 2 heat storages heat air, are respectively stored in heat regenerator
Hot body is switched over by intervals.
4. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction according to claim 1, special
Sign is：Iron ore concentrate or iron ore are mixed after pelletizing or grading with the reduction coal in proportion of same particle sizes, mixing
Material is laid on kiln car from the bottom up successively according to the ascending sequence of granularity, is finally tiled in material upper surface
One layer of carbon residue or semi-coke, 120~160mm of direct-reduction thickness of feed layer, 60~90mm of magnetizing roast thickness of feed layer.
5. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction according to claim 1, special
Sign is：Iron ore is during tunnel oven magnetizing roast, by controlling 1000~1100 DEG C of tunnel oven high-temperature roasting temperature, high temperature
Roasting time 60min or so can make the Fe in iron ore2O3Magnetizing roast is Fe3O4。
6. a kind of heat accumulating type tunnel oven for iron ore magnetizing roast or direct-reduction according to claim 1, special
Sign is：Iron ore is during tunnel kiln direct reduced, by controlling 1150~1250 DEG C of tunnel oven high-temperature roasting temperature, high temperature
90~120min of recovery time can be such that iron ore is restored.
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| CN111238223A (en) * | 2020-04-01 | 2020-06-05 | 白承国 | Natural convection technology for hot gas in tunnel kiln |
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