CN104215064B - Straight tunnel cave for Iron Ore Powder direct-reduction - Google Patents
Straight tunnel cave for Iron Ore Powder direct-reduction Download PDFInfo
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Abstract
The invention discloses a kind of metallurgical equipment, a kind of straight tunnel cave for Iron Ore Powder direct-reduction.The invention provides one and avoid the straight tunnel cave for Iron Ore Powder direct-reduction of " eggshell " effect, including rectilinear kiln body, through kiln body track, chassis in orbit and the combustion system being laid in kiln body are set, also include thermoconductive material board, described thermoconductive material board is arranged in kiln body, and the burner hearth between chassis table top and kiln body kiln crown is separated into upper and lower two-layer, it is at the middle and upper levels for laying the combustor of combustion system, and lower floor is reative cell.Owing to burner hearth to be separated into combustor and reative cell, this makes material block with holes to be directly heated, but by thermoconductive material board, the heat in combustor is transmitted in reative cell, in laser heating runs, the heat energy of combustor can be with the heat energy of reative cell close to balance, namely the internal-external temperature difference of material block is the least, and the mode of this indirect heating has just cracked " eggshell " effect.
Description
Technical field
The present invention relates to a kind of metallurgical equipment, a kind of straight tunnel cave for Iron Ore Powder direct-reduction.
Background technology
Steel and iron industry is through oversintering, Iron Ore Powder to be delivered to blast furnace smelting again become molten iron, and then become next procedure has high heat energy
Main material, long-term industrial practice defines the traditional handicraft that scale is ripe.Along with technical research and progress, this
Traditional handicraft is due to its high energy consumption, with high investment, high pollution and high operating cost, and is challenged by Direct Reducing Iron Process technology.
DRI research at present and production are mainly based on gas-based reduction and coal base reduction, relative to traditional handicraft, by Iron Ore Powder
In ferrum oxide be reduced into metallic iron product, a set of DRI functions of the equipments may replace the sintering of traditional handicraft, coking, height
The function of stove.But, with regard to DRI research and produce present situation for: 1. Iron Ore Powder as main material because of test, produce
Technique or to go back the purposes of original product different, exist for difference in various degree in the material preparatory stage, not only include coal base, grain
The component compatibilities such as degree, desulfurizing agent, catalyst are different, and then extruding Iron Ore Powder being directly loadable into container, having having or compacting
Become pelletizing and other shape.The difference of component compatibility, directly determines the temperature required for reduction reaction and reaction at such a temperature
Speed；Iron Ore Powder is directly loadable into container and reduces, although eliminate Iron Ore Powder forming process, although but in test by component
Compatibility carries out some adjustment, found that the condition that conduction of heat is ferrum reduction reaction to be realized and the restrictive factor of response speed；Ball
Group or other shapes of ferrum reduction reaction, often do not mate because of component compatibility, compaction rate and heat-supplying mode in test and practice
Or because one factor is improper, forming " eggshell " effect on the surface of shape, its mechanism is that material is themselves directly heated, its surface
By thermal velocity much larger than the internal heat conduction velocity of material, in molten, inside is also not reaching to react required result surface material
Temperature, " eggshell " just creates, not only affects response speed but also affect percent reduction；2. in the research of Iron Ore Powder direct-reduction technique
With application aspect, it is summed up two big main flows: one is the electric furnace short route formed with electric furnace smelting special steel；Two are as
The achievement in research of powder metallurgy correlation technique continues to bring out, and promotes greatly developing of Powder Metallurgy Industry, and Iron Ore Powder is reduced directly
Iron sponge powder is as the main material of powder metallurgy.For reduction apparatus, the stove of coal base reduction has tunnel cave, rotary kiln, turns
End stoves etc., these stove single machine production abilities are the highest, are only suitable for the production of middle and small scale；For the shaft furnace of gas base directly reducing,
Although large-scale production can be carried out, but relatively strong, in the case of there is no natural gas, it is necessary to use coal to the dependency of natural gas
Powder produces coal gas by " coal-made gas furnace ", requires that the material being reduced must be acid pellet simultaneously, and drawback as above is also
There will be.3. research and the application of Iron Ore Powder direct-reduction needs to expand further, and its key link is: more reasonably carry out
It is suitable for the material compatibility of technological equipment, increases reaction interface, improve heat conduction velocity, and then overall raising reduction reaction speed；
Optimize and the most creatively design stove equipment, have both as far as possible other stove equip special advantage, for thermal conditions, process temperature,
The loading of the reducing atmosphere of stove, UTILIZATION OF VESIDUAL HEAT IN, material, product output and cooling etc. realize automatic monitoring and control；Final real
The existing integrated artistic equipment size of capacity, product high-quality, operation low cost low energy consumption, process control specification.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and avoids the straight tunnel for Iron Ore Powder direct-reduction of " eggshell " effect
Road kiln.
Present invention also offers a kind of straight tunnel cave for Iron Ore Powder direct-reduction, including rectilinear kiln body, through kiln body
Track, chassis in orbit and the combustion system being laid in kiln body are set, also include thermoconductive material board, described heat conduction material
Flitch is arranged in kiln body, and the burner hearth between chassis table top and kiln body kiln crown is separated into upper and lower two-layer, and it is at the middle and upper levels for laying
The combustor of combustion system, lower floor is reative cell.Kiln body be shaped as linear, corresponding track is also linear.Heat conduction material
Flitch seals along burner hearth axis and lays, and Heat Conduction Material uses resistant to elevated temperatures Heat Conduction Material, and concrete material should be according to actual situation
Depending on, to reach the balance between energy-conservation and cost.
Further, described thermoconductive material board is carborundum plate, and described carborundum plate is the vault domes towards kiln crown.
The thermal conductivity of carborundum is 3 times of ferrous materials, and has strong thermal shock drag, and so material at reative cell can obtain foot
Enough heat energy；The carborundum plate of domes both can increase the space of reative cell, can increase again the heat-conducting area of carborundum version.
Further, one end of kiln body is provided with fire door, and the other end is closed, and described chassis can move back and forth.Band
Hole material block enters into the reative cell of tunnel cave with chassis, moves to the other end of tunnel cave, the most again backtracking, tunnel always
Different temperature and pressure subregions is set in road kiln, controls material block stopping at each subregion with holes by the speed controlling chassis
Stay the time.This mode enters an one-way movement mode brought out relative to one end, almost can save the kiln body length of half, but
It is that its efficiency enters an one-way movement mode brought out less than one end, is suitable for small-scale production and uses.
Further, described combustion system includes being arranged on the tipburn mouth of top of combustion chamber and being arranged on the side of combustor lateral wall
Burner.Tipburn mouth is a kind of flat-flame burner, heat insulation in this burner watertight aircase band, can fit, tubaeform diffusing opening and airflow centrifugal
Make air-flow be close to inner edge, furnace wall under the effect of power uniformly to spread to surrounding, and form recirculating zone in burner axial centre, when backflow
Medium back flow, to time soon close to swirling eddy exit, is involved in main rotating flow stock by air-flow, becomes its part, reflux medium
Can play, with stove internal flame gas, the effect that stable flame catches fire, also can promote to flow stock jet attached flow, thus define open and flat shape disk
Flame.Side burner is a kind of burner with inferior speed, and burner shell is adiabatic in using, and simple in construction can form sub-high-speed flame, fill
Combustion atmosphere in sub-control stove, is particularly well-suited to preheat the occasion that high temperature is high, and flameholding is safe and reliable.
Further, the working surface layers of described chassis uses the high-strength castable of pink fused alumina alkali resistant.
Further, the working surface layers of described chassis being provided with burner port, described burner port is positioned at the sidewall of working surface layers.
Further, described tunnel cave also includes that sealing structure for water, described sealing structure for water include water sealed tank, fixing cutter and movable blade,
Described water sealed tank is positioned at bottom kiln body, and described fixing cutter is fixedly mounted on bottom kiln body to be located, and described movable blade is arranged on pallet bottom,
Described fixing cutter and movable blade are by coordinating with liquid in water sealed tank with the gap between sealing bottom chassis and kiln body.
Further, described sealing structure for water also includes that scum board, described scum board are arranged on bottom movable blade and are positioned at water sealed tank
In.
Further, described kiln body is compound masonry, and its liner uses that castable refractory is integrated poured to be formed, and outer layer uses double
Layer light heat-insulating material carries out thermal insulation.
Further, described tunnel cave is then designed as staged passage according to gas, pressure, temperature relation on vertical section.
The invention has the beneficial effects as follows: owing to burner hearth being separated into combustor and reative cell, this makes material block with holes to be subject to
To directly heating, but by thermoconductive material board, the heat in combustor is transmitted in reative cell, in laser heating runs,
The heat energy of combustor with the heat energy of reative cell close to balance, thus can heat material block with holes, simultaneously because material block with holes is originally
Body has honeycomb hole, so that material block is close in the degree of heat that each position is subject to, namely material block is inside and outside
The temperature difference is the least, and the mode of this indirect heating has just cracked " eggshell " effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of annular tunnel kiln；
Fig. 2 is the structural representation of straight tunnel cave；
Fig. 3 is the schematic diagram of cross section of the present invention；
Fig. 4 is the schematic diagram of chassis work surface；
Fig. 5 is that the A-A of Fig. 4 is to schematic diagram；
Parts, position and numbering in figure: material Special purpose pressing machine 1, kiln body 2, track 3, chassis 4, thermoconductive material board 5,
Combustor 6, reative cell 7, tipburn mouth 8, side burner 9, ribbon conveyer 10, charging pusher 11, discharging pusher 12,
Discharging machine 13, anti-oxidation pond 14, discharge flue 15, working surface layers 16, thermocouple 17, burning observation port 18, cooling pond
19, material block 20 with holes, sealing structure for water 21.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
The straight tunnel cave for Iron Ore Powder direct-reduction that the present invention provides is belonging to the group of the device for Iron Ore Powder direct-reduction
Become part, the device being reduced directly for Iron Ore Powder below by entirety introduction, thus illustrate that this is for Iron Ore Powder direct-reduction
The feature of straight tunnel cave:
The following method used for the device of Iron Ore Powder direct-reduction is reduced:
A, the v-ti magnetite concentrate powder using Panzhihua Region granularity to be-320～100 mesh, its chemical composition is TFe 58.62%,
TiO28.49%, V2O50.721%, SiO23.19%, S 0.42%, P 0.015%, with granularity-20～the coal dust of 30 mesh and sodium salt
The ratio mixing of catalyst in mass ratio 3～4:0.8～1.2:0.3～0.4；Should be the most suitable when using other raw material
More rescale.
B, will mixing after material be pressed into material block 20 with holes, material block 20 with holes is formed with honeycomb hole；Compatibility is mixed
Good material loads in the mould designed and produced, and is pressed into, with the press of 680 tons, the lump material block that similar honeycomb briquette is spherical,
Density reaches 2.7g/cm3, the aperture of material block with holesSpan 10-12mm, the lumpiness of material block 20 with holes with
The special material distributing machine to trolley surface cloth matches, such as the shape of the material block 20 with holes in Fig. 1 and the cloth on chassis face
Put.So, on the one hand increasing the surface area that material block 20 with holes is heated, its hole makes material be heated evenly；Chassis 4 resistance to
Fire material working surface layers also reaches at long-term continuous operation and keeps uniform temperature, it is also possible to band bottom material block 20 with holes
Hole material block 20 conducts heat, on the other hand press material block 20 with holes is suppressed more densely cross-linked so that powder density is by 1.7g/cm3
After compacting, density reaches 2.7g/cm3, the coal in material block 20 with holes reaches the CO effusion resistance that uniform temperature after-combustion generates
Power increases, and beneficially reduction reaction carries out ground thoroughly.Meanwhile, even if powder and material briquetting are close by thermal conduction rate, then
Chassis face is deposited in the space of a cubic metre one ton of material more so that production efficiency is high and low cost.
C, material block 20 with holes is sent in tunnel cave be reduced directly, wherein the burner hearth thermoconductive material board 5 of tunnel cave separates into
Two-layer up and down, forms combustor 6 and reative cell 7；Material block 20 with holes is admitted in reative cell 7, utilizes in combustor 6 and produces
Raw heat heats material block 20 with holes indirectly.
Variable frequency adjustment is used to regulate valve double control, the pressure control of reative cell 7 with furnace pressure according to technological requirement atmosphere in reative cell
System is between+20～-+50Pa.Before CO on-line gas analysis instrument is loaded on air-introduced machine, when flue gas CO exceedes setting, by electricity
The dynamic valve that performs controls to mix the air quantity of high-temperature flue gas section so that CO burns with oxygen again, and the CO of this part is because the appropriate value of guarantee
Guarantee reduction effect.
This method recommends to use three grades of Distributed Control Systems of computer: upper management level, by high performance technical grade computer and beating
Printing apparatus forms.It is furnished with the special-purpose software of Industry Control, mainly completes the supervision to process equipment running status and report printing
Function, including: total looks run display, the display of thermal parameter, the curve of important parameter show, alarm indicator etc., be correlated with
Amendment, the integrating of flow, the storage of system data；Process control level, by PLC, power supply, communication unit, various input and
Output modules etc. form.Mainly complete the collection of signal, the control of system and communication；Execute-in-place level, at instrumental panel and automatically controlled
Automatically (being switched to computer control) and manually (switching to control on the spot) mode are set on dish, and it is normal to be provided with maintenance process equipment
The indispensable instrument run.Manual mode can be separated from computer control system, directly joins thermal technology on instrument cabinet and electrical control cubicles
The control of number operates.
The Control for Kiln Temperature of tunnel cave uses continuously proportional control mode, the temperature that thermocouple accesses through temperature controller relatively after export (following
Signal system all uses 4～20mA) control high low signal and carry out the size of control valve position to the air on each section of house steward, gas regulator,
Thus regulate air, the quantity delivered of coal gas realize temperature regulation control.Air, gas regulator synchronize perform, but they
There is an allocation proportion setting value (K value 0.8～1.2) on computer, complete automatically joining of air and coal gas by setting this value
Ratio, this value can select according to virtual condition in the flow value of flow-through orifice detection and stove.
The inner flue gas of the stove of tunnel cave is made up of two parts, and gas-fired produces exhaust gas volumn and supplemental combustion air enters and produces cigarette with CO burning
Tolerance, is flowed out by exhaust opening.Inner flue gas of the stove flows to be inverse furnace bottom rotation direction, and flue gas passes through expansion chamber after exhaust opening is discharged
Dust is suitably settled by A, and flue gas divides two plumes to cross two groups of air heat exchangers, two groups of difference combustion airs and supplemental combustion air.Pass through
Flue-gas temperature after two groups of air heat exchangers is about down to about 620 DEG C, and these two strands of flue gases enter expansion chamber B after confluxing again and enter back into
Gas change heater.Inlet air temp 20 DEG C, through its outlet temperature of heat exchange about 550 DEG C；Gas entry temperature 20 DEG C, warp
Its outlet temperature of heat exchange can reach about 300 DEG C, reaches energy-saving and cost-reducing effect.
The inventive method is introduced below by embodiment:
Embodiment 1: use this method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200 mesh), 20～30g coal dust (grain
Degree-10 mesh～20 mesh), 1.1～1.5g sodium salt mixing (mouldable), at a temperature of 1150 DEG C preheat 10～20min, 1300 DEG C
At a temperature of reductase 12 5～35min, obtaining grade after discharging water-cooled is 70～80% metallization agglomerate, and metallization agglomerate is through broken
Broken, ore dressing obtains a reduced iron powder, and Iron grade is 98%, and ferrum yield reaches 95%, remains Iron Grade of Tailings 10～15%,
Ferrum yield 3～4%, titanium grade 39～40%, mine tailing titanium yield 80%, a reduced iron powder is in 600～800 DEG C through hydrogen also
The secondary reduction iron powder more than 99.5% sampled by the former ferrum that obtains.
Embodiment 2: use this method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici sefstromite concentrate (iron content: 55%, titaniferous: 10%, granularity-200 mesh), 20～30g coal dust (grain
Degree-10 mesh～20 mesh), 1.1～1.5g sodium salt mixing (mouldable), at a temperature of 1150 DEG C preheat 10～20min, 1300 DEG C
At a temperature of reductase 12 5～35min, obtaining grade after discharging water-cooled is 70～80% metallization agglomerate, and metallization agglomerate is through broken
Broken, ore dressing obtains a reduced iron powder, and Iron grade is 97.3%, and ferrum yield reaches 95%, remains Iron Grade of Tailings 10～15%,
Ferrum yield 3～4%, titanium grade 39～40%, mine tailing titanium yield 80%, a reduced iron powder is in 600～800 DEG C through hydrogen also
The secondary also reduced iron powder more than 99.5% sampled by the former ferrum that obtains.
Embodiment 3: use this method to prepare reduced iron powder
By common for 100g Flos Bombacis Malabarici iron ore concentrate (iron content: 60%, granularity-200 mesh), 20～30g coal dust (granularity-10 mesh～
20 mesh), 1.1～1.5g sodium salt mixing (mouldable), at a temperature of 1150 DEG C preheat 10～20min, the temperature of 1300 DEG C
Lower reductase 12 5～35min, obtaining grade after discharging water-cooled is 70% metallization agglomerate, and metallization agglomerate obtains through broken, ore dressing
To a reduced iron powder, Iron grade is 97.5%, and ferrum yield reaches 95%, remains Iron Grade of Tailings 10～15%, ferrum yield 3～
4%, one time reduced iron powder obtains the ferrum taste secondary reduction iron powder more than 99.5% in 600～800 DEG C through hydrogen reducing.
Embodiment 4: use this method to prepare reduced iron powder
By common for 100g Flos Bombacis Malabarici iron ore concentrate (iron content: 63%, granularity-200 mesh), 20～30g coal dust (granularity-10 mesh～
20 mesh), 1.1～1.5g sodium salt mixing (mouldable), at a temperature of 1150 DEG C preheat 10～20min, the temperature of 1300 DEG C
Lower reductase 12 5～35min, obtaining grade after discharging water-cooled is 70% metallization agglomerate, and metallization agglomerate obtains through broken, ore dressing
To a reduced iron powder, Iron grade is 98.3%, and ferrum yield reaches 95%, remains Iron Grade of Tailings 10～15%, ferrum yield 3～
4%, one time reduced iron powder obtains the ferrum taste secondary also reduced iron powder more than 99.5% in 600～800 DEG C through hydrogen reducing.
Embodiment 5: use this method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 47%, granularity-200 mesh), 39～43g coal dust (grain
Degree-10 mesh～20 mesh), 6.5～8g sodium salt mixing (mouldable), at a temperature of 1300 DEG C reduce 35～45min, discharging
Obtaining grade after water-cooled is 35% metallization agglomerate, and metallization agglomerate obtains a reduced iron powder, ferrum product through broken, ore dressing
Position is 95%, and ferrum yield reaches 88%, remains Iron Grade of Tailings 5%, ferrum yield 10%, titanium grade 80%, mine tailing titanium yield 87%
Embodiment 6: use this method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200 mesh), 39～43g coal dust (grain
Degree-10 mesh～20 mesh), 6.5～8g sodium salt mixing (mouldable), at a temperature of 1300 DEG C reduce 35～45min, discharging
Obtaining grade after water-cooled is 35% metallization agglomerate, and metallization agglomerate obtains a reduced iron powder, ferrum product through broken, ore dressing
Position is 94%, and ferrum yield reaches 85%, remains Iron Grade of Tailings 5%, ferrum yield 10%, titanium grade 80%, mine tailing titanium yield 85%.
Embodiment 7: use this method to prepare reduced iron powder
By 77g Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200 mesh), 21～24g Flos Bombacis Malabarici vanadium titanium
Ilmenite concentrate (iron content: 33%, titaniferous: 47%, granularity-200 mesh), 35～39g coal dust (granularity-10 mesh～20 mesh), 2.1～
3g sodium salt mixing (mouldable), reduction 35～45min at a temperature of 1300 DEG C, obtaining grade after discharging water-cooled is 60% metal
Changing agglomerate, metallization agglomerate obtains a reduced iron powder through broken, ore dressing, and Iron grade is 97%, and ferrum yield reaches 95%,
Residue Iron Grade of Tailings 10%, ferrum yield 5%, titanium grade 52%, mine tailing titanium yield 85%, a reduced iron powder is in 600～800 DEG C
The ferrum taste secondary also reduced iron powder more than 99.5% is obtained through hydrogen reducing.
Embodiment 8: use this method to prepare reduced iron powder
By 77g Flos Bombacis Malabarici sefstromite concentrate (iron content: 55%, titaniferous: 9%, granularity-200 mesh), 21～24g Flos Bombacis Malabarici vanadium titanium
Ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200 mesh), 35～39g coal dust (granularity-10 mesh～20 mesh), 2.1～
3g sodium salt mixing (mouldable), reduction 35～45min at a temperature of 1300 DEG C, obtaining grade after discharging water-cooled is 56% metal
Changing agglomerate, metallization agglomerate obtains a reduced iron powder through broken, ore dressing, and Iron grade is 98%, and ferrum yield reaches 95%,
Residue Iron Grade of Tailings 10%, ferrum yield 5%, titanium grade 52%, mine tailing titanium yield 83%, a reduced iron powder is in 600～800 DEG C
The ferrum taste secondary also reduced iron powder more than 99.5% is obtained through hydrogen reducing.
Device for Iron Ore Powder direct-reduction includes the tunnel cave of material Special purpose pressing machine 1, feed mechanism and the present invention, described
Material Special purpose pressing machine 1 is described tunnel cave feed by feed mechanism, and described tunnel cave includes kiln body 2, rail through kiln body 2
Road 3, chassis 4 on the track 3 and the combustion system being laid in kiln body 2, the mould of described material Special purpose pressing machine 1 are set
On be provided with honeycomb hole molding structure；Described tunnel cave also includes that thermoconductive material board 5, described thermoconductive material board 5 are arranged on kiln body 2
In, and the burner hearth between chassis 4 table top and kiln body 2 kiln crown is separated into upper and lower two-layer, it is at the middle and upper levels for laying combustion system
Combustor 6, lower floor is reative cell 7.This equipment is in actual production, and material block 20 with holes only passes through from reative cell 7, because of
This material block 20 with holes can't be the most heated, and burner hearth is separated by thermoconductive material board 5, in laser heating runs, and burning
The heat energy of room 6 can just crack " eggshell " effect with the heat energy of reative cell 7 close to balance by the mode of this indirect heating.
In order to obtain preferable heat conductivility, described thermoconductive material board 5 is carborundum plate, and described carborundum plate is that vault is towards kiln
The domes on top.The thermal conductivity of carborundum is 3 times of ferrous materials, and has strong thermal shock drag, so at reative cell
Material can obtain enough heat energy；The carborundum plate of domes both can increase the space of reative cell, can increase again carborundum
The heat-conducting area of version.
Fig. 1 is one embodiment of the present invention, can be described as annular tunnel kiln, and described kiln body 2 is arranged to circular arc along axis,
Described track 3 is annular, and the two ends on described kiln body 2 circumferencial direction are respectively feed end and discharge end.
Fig. 2 is another embodiment of the invention, can be described as straight tunnel cave, and kiln body 2 is arranged to linear along axis, institute
Stating track 3 is also linear, and the feed end of kiln body 2 and discharge end share a port or lay respectively at the two ends of kiln body 2.
Above two embodiment all uses more piece chassis, such as, existAssembled 22 chassis in loop tunnel, in annular
Carry out in tunnel cave feeling relieved steadily operating, and 3 driving means become 360 ° of layouts and frequency conversion adjustable, make the chassis speed of service 2～6
Week/hour scope, the most just can be easy to laying of cloth and drawing mechanism.The more important thing is the selected of trolley surface refractory material,
Because the material being reduced directly is carried out on trolley surface refractory material, it is desirable to have intensity, do not ftracture, indeformable, not sizing,
Test uses the high-strength castable of pink fused alumina alkali resistant do trolley surface, reached Expected Results.
The combustion system of the present invention includes the tipburn mouth 8 being arranged on combustor 6 top and is arranged on the side burning of combustor 6 lateral wall
Mouth 9.The layout of burner, as it is shown in figure 1, mainly arrange tipburn mouth for annular tunnel kiln, proves to select properly by test
Carborundum sheet material, its thermal conductivity is 3 times of ferrous materials, and has strong thermal shock drag, so at the material energy of reative cell
Access enough heat energy.Tipburn mouth and side burner bidirectional arrangements are then used for straight tunnel cave, as in figure 2 it is shown, simultaneously,
Chassis working surface layers 16 band burner port, states burner port and is positioned at the sidewall of working surface layers 16, shown in Figure 5, iron powder or iron powder
Pressing block is on chassis face during heated reduction, and chassis is in static, and tipburn mouth and side burner make material be heated up and down, favorably
Quickly carrying out in reduction reaction.
Concrete, as shown in Figure 1 and Figure 4, described feed mechanism includes that ribbon conveyer 10, charging pusher 11 and discharging push away
Material machine 12, described ribbon conveyer 10 extends to be positioned at the track 3 of kiln body 2 feed end from material Special purpose pressing machine 1, described
Charging pusher 11 is corresponding with material Special purpose pressing machine 1 position and chassis 4 position respectively with discharging pusher 12.Ribbon conveyer
10 to 4 cloth material with holes blocks 20 of chassis, and ribbon conveyer 10 can use steel crawler type material distributing machine, its traffic direction and chassis
The direction of travel of 4 is vertical, and in terms of the cross-sectional direction of chassis 4, ribbon conveyer 10 is along chassis 4 surface, left side, trolley rail
Circular flow is made on road down channel and right side, referring specifically to shown in Fig. 4, has one and chassis operation side above ribbon conveyer 10
To consistent discharging pusher 12, when material block 20 with holes runs to close to chassis 4 outer rim set point on discharging pusher 12
Time, material block 20 with holes on ribbon conveyer 10 is shifted onto on 4, chassis, determine the material recovery time by discharging pusher 12
The speed of service of chassis 4, ensures the compacting of material block 20 with holes with two or more material Special purpose pressing machines 1.It practice,
Whole feed mechanism is material Special purpose pressing machine 1, ribbon conveyer 10, discharging pusher 12 and the combination of charging pusher 11,
And it is chain to realize series.Chain retrodict, i.e. chassis 4 speed of service determines ribbon conveyer 10 speed of service, as front-seat (row
Refer to chassis width) material block 20 with holes move ahead distance just have after row material with holes block 20 position time, ribbon conveyer 10
On must just have row's material block, now discharging pusher 12 is according to the timely pusher of infrared signal or the time relay, equally
Discharging pusher 12 coordinates with material Special purpose pressing machine 1, and material powder is injected mould, material Special purpose pressing machine by quantitative timing batcher
From the demoulding after 1 compacting, material Special purpose pressing machine 1 also configure charging pusher 11, when material Special purpose pressing machine 1 hammer (or referred to as
Upper mold) after the demoulding on lift, on charging pusher 11 pushing belt hole material block 20 to ribbon conveyer 10, for ensureing feeding speed extremely
The material Special purpose pressing machine 1 needing 2 or more than 2 less coordinates.
In order to avoid go back original product after coming out of the stove oxidized, as it is shown in figure 1, also include discharging machine 13 and anti-oxidation pond 14, institute
State discharging machine 13 and be positioned at kiln body 2 discharge end corresponding with chassis 4 table top, the outlet of described discharging machine 13 and anti-oxidation pond 14 phase
Even.The chassis 4 of annular tunnel kiln is constantly in running status in process of production, uses spiral discharging machine will be gone back by skewed slot again
Material after former is sent directly into anti-oxidation pond；The chassis of straight tunnel cave is location in discharging and cloth position, and pusher directly will
Material after reduction pushes anti-oxidation pond, more mobile to cloth position cloth, enters back into the also original production of next round.
For the ease of discharging, described discharging machine 13 includes spiral discharging machine and gear shovel；Described gear shovel towards the one side in supplied materials direction is
Arc surface, the axis of described arc surface is vertical with supplied materials direction and parallel with chassis 4 table top；Described gear shovel and spiral discharging machine
Entrance is corresponding.What gear shoveled is shaped as " " ", the baffle plate of similar bulldozer shovel.The lower edge of gear shovel presses close to chassis 4 work surface,
When chassis 4 runs the material on its face kept off shovel arcwall face roll, gear shovel before screw blade by material discharge.
In order to lower the temperature in time, the helical axis of described spiral discharging machine is hollow form, and helical axis is provided with water inlet end and water side；
What described gear shoveled is internally provided with cooling water cavity, and cooling water cavity is respectively arranged with water inlet and outlet.Material after coming out of the stove still
So being in the condition of high temperature, use cooling water cooling can protect screw blade and gear shovel.
In order to obtain good sealing effectiveness, described tunnel cave also includes that sealing structure for water 21, described sealing structure for water 21 include water seal
Groove, fixing cutter and movable blade, described water sealed tank is positioned at bottom kiln body 2, and described fixing cutter is fixedly mounted on bottom kiln body 2 to be located,
Described movable blade is arranged on bottom chassis 4, described fixing cutter with movable blade by coordinating with liquid in water sealed tank to seal chassis 4
And the gap between bottom kiln body 2.Described sealing structure for water 21 also includes that scum board, described scum board are arranged on bottom movable blade also
It is positioned at water sealed tank.So when chassis 4 rotates, circumferential weld falls into the material in water sealed tank and some other impurity, along with rotate
Relative motion between movable blade and fixing water sealed tank, at the funnel progressively scraped on water sealed tank, the most clear finally by funnel
Slag, transports with dolly.
Introduce the specific works details of present device in detail below:
As shown in Figure 1, Figure 3, the mould of material Special purpose pressing machine 1 accepts from batch mixer again through the compatibility material of constant feeder,
Material Special purpose pressing machine 1 suppresses, from the demoulding, material block 20 with holes is pushed to the carrier bar of ribbon conveyer 10 by charging pusher 11,
Under the conveying of grouser shoe, material block 20 with holes reaches the working surface layers 16 of chassis 4, and interlock makes discharging pusher 12
Action, the scraping wings of discharging pusher 12 matches with the width of working surface layers 16, and material block 20 with holes is just disposed in chassis
On the work surface 16 of 4.
Chassis 4, under three driving means becoming 120 ° of distributions drive, is made to run by pre-set velocity clockwise, discharge flue 15
Being arranged on the initiating terminal of kiln body 2 charging, discharge flue 15 is connected with mud chamber A, B and two groups of heat exchangers, and flue gas passes through again
Sack cleaner, desulfurizing tower realize the inside and outside row of mark.
Ribbon conveyer 10, under the driving of driving means, starts to run, at the work surface of chassis 4 around the transverse section of chassis 4
Carry material block 20 with holes time on layer 16, run and obtained by concrete cooling pond 19 grouser shoe to chassis 4 track
Cooling.
Sealing structure for water 21 is arranged on the column of inner and outer ring, and movable blade is arranged on chassis 4, rotates with chassis 4, it is to avoid
In reative cell 7, gas overflowing is outdoor and cool exterior air enters in reative cell 7.The burner hearth of tunnel kiln is separated by carborundum plate 5
For combustor 6 and reative cell 7.
Carborundum plate passes through thermal transmittance test, and its pyroconductivity reaches 96%, i.e. carborundum plate upper surface point temperature is 1355 DEG C,
Conducted heat downwards by carborundum plate, then the temperature of the lower surface point of this plate is about 1300 DEG C, with the thickness of plate almost without pass
System.Carborundum plate makes arc, and for making combustor conduct heat to reative cell equably, the direct direction of tipburn mouth 8 heat supply is carbon
The arc top of SiClx plate, the side burner 9 that the interior outside of annular kiln body is arranged on combustor 6 height, the direct direction of its heat supply is
The both sides extrados of carborundum plate 12.
The furnace temperature of continuous tunnel furnace kiln major control combustor 6, uses continuously proportional control mode, and the thermocouple of combustor 6 accesses
Temperature through temperature controller relatively after export (signals below system all uses 4～20mA) control high low signal to the air on each section of house steward,
Gas regulator carrys out the size of control valve position, thus regulate air, the quantity delivered of coal gas realizes the regulation of temperature and controls.Reative cell
The thermocouple of 7 is only made with reference to being not involved in control.
Atmosphere in the reative cell 7 of tunnel stove uses variable frequency adjustment to regulate valve double control with furnace pressure so that it is room pressure controls
About+20～+50Pa.Before CO on-line gas analysis instrument is loaded on air-introduced machine, when flue gas CO exceedes setting, held by electronic
Row valve controls to mix the air quantity of high-temperature flue gas section so that CO burns with oxygen again, and the CO of this part guarantees because ensureing appropriate value
Reduction effect.
The operation of tunnel stove uses three grades of Distributed Control Systems of computer, the most upper management level, Engineering Control level and execute-in-place
Level.Concentrate on the central control room at scene.
The pink fused alumina alkali resistant high-strength castable cast of the working surface layers 16 of chassis 4 forms, and chassis 4 runs clockwise, by with holes
Material block 20 is brought tunnel cave into from feeding mouth and is walked reative cell 7, and is heated under reducing atmosphere in material reaction room 7, band
Carbon in material block 20 coal dust of hole carries out reduction reaction at a certain temperature with the ferrum oxide in Iron Ore Powder, by the operation speed of chassis 4
Degree is set by frequency conversion, and material block 20 limit in stove with holes is heated, limit is reacted, limit is run with chassis 4,
About through 45 minutes from feeding mouth to discharging opening, complete Iron Ore Powder DRI process.
The equipment of the first embodiment of the application is introduced below by specific embodiment:
Such as Fig. 1,3 and 4, annular tunnel kiln reaction chamber temperature is scattered in three sections, i.e. omnidistance 45 minutes, wherein temperature 1150 DEG C
Accounting for 15 minutes, temperature 1300 DEG C accounts for 25 minutes, and in stove, natural slow cooling accounts for 5 minutes.Remove accounting for of cloth station and discharging station
Parallactic angle 50 °, the occupy-place angle of loop tunnel kiln body 8 is 310 °, meets the temperature section of reative cell, accounting for of 1200 DEG C, relative combustion room
Parallactic angle is 90 °, and the occupy-place angle of combustor 1355 DEG C is 185 °, 35 ° of the occupy-place angle of natural slow cooling in stove.Tipburn mouth 8 and inside and outside
Side burner 9 lays according to this position and temperature requirement.
Completing the material block 20 with holes of reduction reaction under the delivery of chassis 4 from discharging opening out, the baffle plate of spiral discharging machine is by it
Rolling, screw blade pushes material block 20 with holes to discharging skewed slot, and action of gravity material with holes block 20 falls into anti-oxidation pond 14.
The material being reduced is taken out entering broken, mill and selects system, through the reduction of said process again through broken, mill choosing, obtains
Reduced iron powder, its result: 1) Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200～100 mesh),
Coal dust (granularity-20 mesh～30 mesh), catalyst mix, and briquetting, through above-mentioned reduction process, obtains a reduced iron powder, ferrum product
Position is 98%, and ferrum yield reaches 95%, remains Iron Grade of Tailings 10～15%, ferrum yield 3～4%, titanium grade 39～40%, tail
Ore deposit titanium yield 80%, one time reduced iron powder obtains the Iron grade secondary reduction more than 99.5% in 600～800 DEG C through hydrogen reducing
Iron powder.2) Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200～100 mesh), coal dust (granularity-
20 mesh～30 mesh), catalyst mixing, briquetting is through above-mentioned reduction process, and obtaining grade is 35% metallization agglomerate, metallization
Agglomerate obtains a reduced iron powder through broken, ore dressing, and Iron grade is 94%, and ferrum yield reaches 85%, remains Iron Grade of Tailings
5%, ferrum yield 10%, titanium grade 80%, mine tailing titanium yield 85%.See following table:
The working method of of the present invention the second embodiment equipment be described below:
The method and apparatus of the second Iron Ore Powder direct-reduction, as shown in Figure 2, Figure 3, Figure 4.Material Special purpose pressing machine 1 is also furnished with
Pusher is at cloth station, and by material block 20 with holes feeding in the working surface layers 16 of chassis 4, the driving means of chassis 4 will
It sends into the reduction station of straight type tunnel cave, and closure of a tunnel furnace door carries out location reduction to material block 20 with holes.
The refractory material working lining of straight type tunnel cave chassis 4 has laid the burner port crossing chassis 4 width, the flame of side burner 9
This burner port of positive alignment, the furnace roof burner 8 of combustor 6 heats facing to the upper cambered surface of carborundum plate, and material block 20 with holes exists
Reative cell 7 is heated up and down.
The flue gas of combustor 6 and reative cell 7 divides two-way to fume emission passage 15, implements dedusting and heat exchange.Temperature, atmosphere
The same annular tunnel kiln of control device.
Handled by the computer of Central Control Room, such as each burner air inlet, air intake control of valve position, make reative cell 7 temperature 1050～
1150 DEG C and 1280～1300 DEG C of two scopes, the overall process time is 35 minutes, first temperature section 15 minutes, second temperature
Degree section is 20 minutes.
One reduction process terminates, and opens tunnel cave fire door, and chassis 4 is driven to discharging position, and pusher discharging machine 13 directly will also
Original product pushes anti-oxidation pond 14.Enter next station cloth position afterwards, repeat a upper engineering.
Claims (7)
1. for the straight tunnel cave of Iron Ore Powder direct-reduction, including rectilinear kiln body (2), track through kiln body (2)
(3) chassis (4), being arranged on track (3) and the combustion system being laid in kiln body (2), it is characterised in that: also wrap
Including thermoconductive material board (5), described thermoconductive material board (5) is arranged in kiln body (2), and by chassis (4) table top and kiln body (2)
Burner hearth between kiln crown is separated into upper and lower two-layer, and it is at the middle and upper levels for laying the combustor (6) of combustion system, and lower floor is reative cell (7)；
The working surface layers (16) of described chassis (4) uses the high-strength castable of pink fused alumina alkali resistant, the working surface layers (16) of described chassis (4)
On be provided with burner port, described burner port is positioned at the sidewall of working surface layers (16)；Also include sealing structure for water (21), described water seal
Structure (21) includes water sealed tank, fixing cutter and movable blade, and described water sealed tank is positioned at kiln body (2) bottom, and described fixing cutter is fixed
Being arranged on kiln body (2) bottom place, described movable blade is arranged on chassis (4) bottom, described fixing cutter and movable blade by with water
In sealing groove, liquid coordinates to seal the gap between chassis (4) and kiln body (2) bottom.
2. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: described Heat Conduction Material
Plate (5) is carborundum plate, and described carborundum plate is the vault domes towards kiln crown.
3. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: one end of kiln body sets
Being equipped with fire door, the other end is closed, and described chassis can move back and forth.
4. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: described combustion system
Including being arranged on the tipburn mouth (8) at combustor (6) top and being arranged on the side burner (9) of combustor (6) lateral wall.
5. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: described sealing structure for water
(21) also including scum board, described scum board is arranged on bottom movable blade and is positioned at water sealed tank.
6. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: described kiln body (2)
For compound masonry, its liner uses that castable refractory is integrated poured to be formed, and outer layer uses double-deck light heat-barrier material to carry out thermal insulation.
7. the straight tunnel cave for Iron Ore Powder direct-reduction as claimed in claim 1, it is characterised in that: described tunnel cave exists
Then it is designed as ladder parameter type passage according to gas, pressure, temperature relation on vertical section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410431203.6A CN104215064B (en) | 2014-08-28 | 2014-08-28 | Straight tunnel cave for Iron Ore Powder direct-reduction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410431203.6A CN104215064B (en) | 2014-08-28 | 2014-08-28 | Straight tunnel cave for Iron Ore Powder direct-reduction |
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| CN104215064B true CN104215064B (en) | 2016-09-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105043095A (en) * | 2015-06-25 | 2015-11-11 | 石家庄新华能源环保科技股份有限公司 | Double-heating rotary hearth ring furnace |
| CN108007157B (en) * | 2017-12-01 | 2019-10-11 | 合江县华艺陶瓷制品有限公司 | Dry kiln |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1248542B (en) * | 1990-06-27 | 1995-01-19 | Riedhammer Gmbh Co Kg | ROLLER OVEN |
| RU2091688C1 (en) * | 1993-06-08 | 1997-09-27 | Санкт-Петербургский государственный институт научно-исследовательских и проектных работ огнеупорной промышленности | Tunnel furnace |
| CN2438926Y (en) * | 2000-09-08 | 2001-07-11 | 张立涛 | Channel type continuous fritting furnace |
| CN2490530Y (en) * | 2001-07-02 | 2002-05-08 | 张立涛 | Tunnel continuous sintering furnace |
| CN2704010Y (en) * | 2004-04-16 | 2005-06-08 | 四川省九达水煤浆技术产业有限公司 | Roller-bed kiln using water-coal as fuel |
| CN201368666Y (en) * | 2009-02-17 | 2009-12-23 | 顾玲 | Ring-shaped reduction furnace being capable of quickly eliminating leaking material of water seal groove |
| CN201583129U (en) * | 2010-03-19 | 2010-09-15 | 何德武 | Tunnel furnace |
| CN202786299U (en) * | 2012-05-09 | 2013-03-13 | 沈阳博联特熔融还原科技有限公司 | Reduced iron kiln |
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Denomination of invention: Straight tunnel kiln for direct reduction of iron ore powder Effective date of registration: 20190307 Granted publication date: 20160921 Pledgee: Contractor Bank Co., Ltd. Chengdu Branch Pledgor: Panzhihua Liyu Mining Co., Ltd. Registration number: 2019510000024 |
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