CN103820591A - Bell type blast furnace smelting method by using small-size sinters - Google Patents
Bell type blast furnace smelting method by using small-size sinters Download PDFInfo
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- CN103820591A CN103820591A CN201410075519.6A CN201410075519A CN103820591A CN 103820591 A CN103820591 A CN 103820591A CN 201410075519 A CN201410075519 A CN 201410075519A CN 103820591 A CN103820591 A CN 103820591A
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Abstract
The invention discloses a bell type blast furnace smelting method by using small-size sinters. The method comprises the steps as follows: loading, that is, ore and coke both containing the small-size sinters are added into a bell type blast furnace; blowing, specifically, air blast kinetic energy is controlled to be 150-230kJ/s, the air blast temperature is not lower than 1,180 DEG C, and the air blast oxygen enrichment percentage is not lower than 1 percent; wherein, the small-size sinter comprises the following components by weight percentage: 45-55 percent of sinter which is 3-5 mm in particle size, 35-45 percent of sinter with particle size greater than 5 mm and 0-20 percent of sinter with particle size smaller than 3 mm. According to the bell type blast furnace smelting method by using small-sized sinter, disclosed by the invention, the defect that the small-size sinter cannot be used by a bell type blast furnace for smelting is overcome, and by regulating process parameters, the normal production is ensured and the economic benefit is improved. Moreover, the processing cost of sorting the grades of the singers is reduced by recovering the small-sized sinters in returned ore into the blast furnace for smelting. Furthermore, by adopting the small-size sinters, the state of the material shortage of blast furnace is eliminated, and the cost of raw materials is lowered.
Description
Technical field
The invention belongs to ore smelting technical field, specifically, relate to a kind of method that clock-type blast furnace utilizes granule level agglomerate to smelt.
Background technology
Granule level agglomerate refers to that in the screen underflow of blast furnace sinter ore deposit, granularity is greater than the agglomerate of 3mm, and in BF return fines, occupies significant proportion.Conventionally, the agglomerate of grade >5mm can directly be smelted as finished product.But, owing to sieving the problem such as specification and sieve powder efficiency under finished product screen, ditch, making in returning mine to be the agglomerate of grade <5mm completely, that is to say, includes more grade >5mm and the grade granule level agglomerate at 3～5mm in returning mine.
The recycling of granule level agglomerate not only can be alleviated agglomerate supply " bottleneck ", but also can avoid the waste of the energy, then for enterprise has saved a large amount of running cost.By BF return fines granularity trace analysis is found, the content that in BF return fines, grade is greater than the agglomerate of 3mm reaches 37.2%, is very abundant " mineral reserve ".
In the prior art, not affecting under the prerequisite of smooth operation of furnace guaranteeing blast furnace to utilize granule level agglomerate, must be without clock-type blast furnace, and adopts polycyclic distributing, could recycle granule level agglomerate.In addition, also need to change former weigh-feeder into choke-preventing screen type sieve that efficiency is higher and sieve again, to guarantee that the ratio control of agglomerate that granularity in granule level agglomerate is less than 3mm is in 7% left and right, to meet blast-furnace smelting requirement.Meanwhile, also need in whole system as the go forward side by side Mobile state management of material inlet, vibratory screening apparatus etc. transformations, unobstructed to realize system logistics.In addition, in the selection of charging method and distributing mode, need to meet the production requirement of blast furnace in the mode of concentrated charging separately, and need to adjust bottom incoming air area, raising actual wind speed blows through center and enlivens the measure assurance furnace condition anterogrades such as cupola well.For example, in the time of the granule level agglomerate that utilizes grade at 3～5mm, granule level agglomerate need to be distributed on furnace throat endless belt at any angle radially, promote high furnace temperature direct motion to improve the reasonable layout of coal gas.Therefore, in the time utilizing granule level agglomerate, make charging, cloth and pushing wind manipulation complexity without clock-type blast furnace.
In addition, using document, the patent of granule level sinter grading charging a lot of both at home and abroad about bell-free blast furnaces, is clock-type blast furnace but there is no an example.Be limited to various condition restriction, domestic existing clock-type blast furnace is not within minority at present.
Therefore, to reduce costs in order economizing on resources, can to utilize better granule level agglomerate, be necessary to provide a kind of clock-type blast furnace to utilize the method for granule level agglomerate.
Summary of the invention
For the problems referred to above that exist in present technology, a kind of method that the object of the present invention is to provide clock-type blast furnace to utilize granule level agglomerate to smelt.
According to an aspect of the present invention, a kind of method that provides clock-type blast furnace to utilize granule level agglomerate to smelt, described method comprises charging: the ore that contains granule level agglomerate and coke are joined in clock-type blast furnace; Air-supply: control blast energy is 150～230kJ/s, and blast temperature is not less than 1180 ℃, and air blast oxygen enrichment percentage is not less than 1%; Wherein, granule level agglomerate comprises the agglomerate of agglomerate that 45～55% grade is 3～5mm, 35～45% grade >5mm and the agglomerate of 0～20% grade <3mm by weight percentage.
According to one embodiment of present invention, based on the gross weight of ore, the weight of described granule level agglomerate is 0.5～10.0%.
According to one embodiment of present invention, described ore also comprises large grade agglomerate, lump ore and pellet, and in the time joining in clock-type blast furnace, ore bed is followed successively by large grade sintering ore bed, lump ore layer, pelletizing ore bed and granule level sintering ore bed from top to bottom.
According to one embodiment of present invention, the batch weight of every batch of ore is 20t～25t, and control coke load is 4.2t/t～5.0t/t.
According to one embodiment of present invention, in the time that ore and coke are carried out to cloth, be distributed into OCOC, open great bell for the second time and be distributed into OO, open the order that great bell is distributed into OCCC for the third time and carry out circulating burden distribution according to opening for the first time great bell; O represents ore, and C represents coke.
According to one embodiment of present invention, in the step of charging, utilize distributor that ore and coke are poured in little clock, open pressure-equalizing and discharging pipe; In the time of the air pressure in great bell and ambient atmosphere pressure balanced, open little clock, so that ore and coke enter in great bell; Close pressure-equalizing and discharging pipe, open and all press gas pipe; When air pressure within the air pressure in great bell is less than or equal to clock-type blast furnace, open great bell, so that ore and coke enter in clock-type blast furnace.
According to one embodiment of present invention, utilize Ma Jishi distributor to carry out cloth to ore and coke.
According to one embodiment of present invention, described method also comprises: the furnace top pressure of controlling clock-type blast furnace is 0.10～0.15MPa, and high top pressure operation rate is not less than 95%.
According to one embodiment of present invention, coke combustion intensity is 1.0～1.2t/m
3d, integrated smelting intensity is 1.4～1.5t/m
3d.
The method that clock-type blast furnace according to the present invention utilizes granule level agglomerate to smelt, has overcome the defect that clock-type blast furnace can not utilize granule level agglomerate to smelt, and by adjusting process parameter, has guaranteed normal production, has improved economic benefit.In addition, the granule level agglomerate in returning mine by recovery enters blast-furnace smelting, has reduced the process cost of screening agglomerate grade.In addition, by utilizing granule level agglomerate to solve blast furnace materials situation in short supply, reduced raw materials cost.
Accompanying drawing explanation
By the description to embodiment of carrying out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 is according to the schematic diagram of the clock-type blast furnace burden distribution system of exemplary embodiment of the present invention;
Fig. 2 is according to preparation and the material loading schematic flow sheet of the granule level agglomerate in the clock-type blast furnace of exemplary embodiment of the present invention.
Embodiment
The method of utilizing granule level agglomerate to smelt to clock-type blast furnace of the present invention is below described in detail.
For current granule level agglomerate utilisation technology or method mainly for bell-free blast furnaces, and the control of clock-type blast furnace material distribution and smelting parameter and bell-free blast furnaces make a big difference, therefore, the invention provides a kind of method that clock-type blast furnace utilizes granule level agglomerate to smelt.
The invention provides a kind of method that clock-type blast furnace utilizes granule level agglomerate to smelt, described method comprise the steps: to feed technique and air feeding technique.
The granule level agglomerate using in method of the present invention can be by sieving and obtain returning mine.In a non-limiting example, as shown in Figure 2, agglomerate sintering vibratory screening apparatus 11 under ditch of storing in ore deposit groove 16.1 storage under trestle sieves, and the agglomerate of grade >5mm is directly fallen under ditch on the main belt 18 of material loading, is transported in feeding cart 4, the agglomerate (returning mine) of grade <5mm is returned mine on transhipment belt 17 under ditch, in the way of returning to sintering, appropriate location (for example, can under ditch, return mine after transhipment belt 17) sieving circuit is set, , the suitable granule level agglomerate that adopts vibratory screening apparatus 13 to reclaim in returning mine, wherein, the classification point of vibratory screening apparatus 13 is 3.0mm, the agglomerate of the middle grade >3mm that returns mine is sifted out, entering ore deposit groove 14 stores, newly-built conveyor 15.1 again, 15.2, 15.3 grades or an independent ore deposit groove 16.4 that utilizes blast furnace trestle belt that the granule level agglomerate of grade >3mm in ore deposit groove 14 is transported under ditch are stored, for blast furnace.Especially, can also under ditch, return mine transhipment belt 17 below be provided with suitable funnel panel turnover device 12.Need to sieve when returning mine while recovery, returning mine enters vibratory screening apparatus 13 by funnel panel turnover device 12 and carries out screening operation, and screen overflow enters ore deposit groove 14, and screen underflow enters transhipment belt 19 by belt or funnel (not shown) and returns to sintering and use; Do not need when returning mine to reclaim while sieving, directly enter transhipment belt 19 by funnel panel turnover device 12 and return to sintering use.So return mine and reclaim operation and be interrupted and carry out, if returning mine of certainly reclaiming and clock-type blast furnace uses while reaching balance, vibratory screening apparatus 13 also can be worked continuously.But the present invention is not limited to this, as long as sieving out the granule level agglomerate of following component and content,, granule level agglomerate comprises the agglomerate of agglomerate that 45～55% grade is 3～5mm, 35～45% grade >5mm and the agglomerate of 0～20% grade <3mm by weight percentage.In addition, preferably, granule level agglomerate comprises the agglomerate of agglomerate that 50% grade is 3～5mm, 40% grade >5mm and the agglomerate of 10% grade <3mm by weight percentage.
In the technique of charging, the ore that contains granule level agglomerate and coke are joined in clock-type blast furnace.
One of clock-type blast-furnace smelting feature is " little batch weight, load greatly, high strength ", bell-type burden difficulty after batch weight strengthens, opens great bell packing frequency and strengthens, and affects blanking direct motion simultaneously, use after granule level agglomerate, due to overall permeability index variation, batch weight can not strengthen, therefore, in one embodiment of the invention, preferably, the batch weight of every batch of ore can be controlled to 20t-25t(more preferably, the batch weight of every batch of ore can be controlled to 20t-21t).In order to promote clock-type smooth operation of furnace, adopt large load reduction pressure reduction, when cloth, coke load can be controlled in 4.2t/t～5.0t/t(more preferably, when material, coke load can be controlled in 4.2t/t～4.8t/t).Preferably, the synthetic load 3.2-4.0t/t of clock-type blast furnace, coke combustion intensity maintains 1.0-1.2t/m
3d, integrated smelting intensity 1.4-1.5t/m
3d.
In one embodiment of the invention, owing to using after granule level agglomerate, overall ventilation property is poor, preferably, 0.5～10.0%(that the weight of granule level agglomerate accounts for ore gross weight more preferably, the weight of granule level agglomerate account for ore gross weight 0.5～5.0%).For exemplarily explanation, the returning mine of middle grade >5mm of returning mine under certain factory's ditch accounts for 20% left and right, because of sieve classification point and screening efficiency problem, that under ditch, returns mine middle grade >5mm can only reclaim 10% left and right, in the granule level agglomerate reclaiming, it can not be all the agglomerate of grade >5mm, wherein, also comprise the agglomerate of grade <3mm, but ratio is little.For example, the granule level agglomerate of recovery comprises by weight percentage: the agglomerate of the grade >5mm of 35-45%, the agglomerate of the agglomerate that the grade of 45-55% is 5-3mm and the grade <3mm of 0-20%.Can clock-type blast furnace all be accepted to reclaim granule level agglomerate and smelt, and can determine according to the smelting condition of clock-type blast furnace.Therefore, preferably, the weight of granule level agglomerate accounts for 0.5～10.0% of ore gross weight, suitable.
According to one embodiment of present invention, can utilize distributor that ore and coke are poured in little clock 2, open pressure-equalizing and discharging pipe 6; In the time of the air pressure in great bell 1 and ambient atmosphere pressure balanced, open little clock 2, so that ore and coke enter in great bell 1; Close pressure-equalizing and discharging pipe 6, open and all press gas pipe 5; When air pressure within the air pressure in great bell 1 is less than or equal to clock-type blast furnace, open great bell 1, so that ore and coke enter in clock-type blast furnace.
Can utilize any suitable distributor to carry out cloth to ore and coke.In one embodiment of the invention, preferably, utilize Ma Jishi distributor 3 to carry out cloth to ore and coke.In the time utilizing Ma Jishi distributor 3 to carry out cloth, can regulation Ma Jishi distributor 3 be 0 ° at elevator side one station, the sharp position of its heap is located corresponding thereto 180 °; Should adopt under normal circumstances the six station work of 60 °, when actual angle and preselected angle are not inconsistent, should proofread and correct in time; In addition, be to adjust Gas Flow to distribute, can Iterim Change Ma Jishi distributor angle and station not.
According to one embodiment of present invention, ore also can comprise large grade agglomerate, lump ore and pellet.In charging process, if coke layer and granule level sintering ore bed contact area are large, granule level agglomerate can bleed in coke layer, cause that ventilation property is poor, therefore, in the time of cloth, allow large grade agglomerate contact with coke, granule level agglomerate is distributed in above large grade agglomerate as far as possible, relevant with the loading sequence of ore.Therefore, preferably, the ore bed in clock-type blast furnace is followed successively by large grade sintering ore bed A, lump ore layer B, pelletizing ore bed C and granule level sintering ore bed D from top to bottom.That is to say, as depicted in figs. 1 and 2, obtaining after granule level agglomerate, this granule level agglomerate is passed through to transhipment belt 15.1, 15.2, 15.3 are transported to and under trestle, store storage in ore deposit groove 16.4, under ditch, no longer sieve, at storage ore deposit groove 16.4, a suitable chute (not shown) is set, granule level agglomerate is entered to weighing bucket and carry out accurate batch weighing, then to the main belt 18 of material loading of clock-type blast furnace, under trestle, store the pellet of storage in ore deposit groove 16.3 simultaneously, under trestle, storing in ore deposit groove 16.2 the large grade agglomerate of storing storage in ore deposit groove 16.1 under the lump ore of storage and trestle falls on the main belt 18 of material loading successively, turn round above-mentioned material is transported in feeding cart 4 successively with the main belt 18 of material loading.According to the cloth regular of clock-type blast furnace roof, granule level agglomerate D should enter in feeding cart 4 at first, is positioned at the bottom of feeding cart 4, is secondly pellet C, lump ore B and large grade agglomerate A.
The feeding cart 4 that ore is housed arrives after the furnace roof of clock-type blast furnace, ore is poured in hopper, according to feeding cart 4 loading sequences, the order of pouring hopper into is just in time contrary, enter in clock-type blast furnace according to the order of large grade agglomerate A, lump ore B, pellet C and granule level agglomerate D successively, like this, effectively avoid granule level sintering ore bed to contact with the direct of coke layer, reduced the probability of the coke layer that bleeds and affected ventilation property.
It should be noted that, large grade agglomerate of the present invention refers to the agglomerate of grade at 5～80mm.
Loading sequence is larger on the smelting impact of clock-type blast furnace, for example, can adopt with dress, along dress, upside-down mounting or their combination.But the principle of burden distribution system is to increase the weight of edge, dredging central gas stream is main.
Impact according to charging system on clock-type blast-furnace smelting, burden distribution system can be divided into three kinds of methods:
First method: complete in dress combination: MA program+NB program+LC program.
Second method: same, packing combination: MA program+NB program+L(W ↓ G ↓) program.
The third method: full packing combination: W ↓ G ↓ program.
In first method, A program is in one-period, to increase the weight of the system at edge, and B program is the system that alleviates edge, and c program is to use as required the system that slightly increases the weight of edge or slightly increase the weight of center.Wherein, M, N, L can adopt suitable ratio according to the variation of smelting condition.
In the second approach, due to with when dress batch weight be restricted, in order further to expand batch weight and to improve gas utilization rate, generally a batch of material is left to great bell at twice and is distributed in clock-type blast furnace.In addition, A program is in one-period, to increase the weight of the system of edge coal gas, and the W in packing and G are also the formal dress that increases the weight of edge, and as W can be OO, G can be OCCC.B program can as required, be used and slightly increase the weight of edge or slightly increase the weight of the system at center.Wherein, M, N, L can be according to the variations of smelting condition, the suitable ratio that employing can be combined.
The third method is full packing, can strengthen batch weight according to the variation of smelting condition, to reach the object of improving coal gas utilization reduction coke ratio.
No matter adopt above-mentioned which kind of method, its final purpose is all will reach Gas Flow reasonably to distribute.In order to improve the metallurgical effect of clock-type blast furnace, comparatively reasonably gas flow distribution is edge coal gas CO
2than height of center 3～5%, that is, reach and increase the weight of edge, the object at dredging center, is beneficial to enliven cupola well reinforcing blast furnace and smelts.For example, can adopt 1A+1B+2C(1OCOC+1COCO+2OO ↓ OCCC ↓), 1A+1C(1OCOC+1OO ↓ OCCC ↓), 2A+1B+2C(2OCOC+1COCO+2OO ↓ OCCC ↓) and 3A+2C(3OCOC+2OO ↓ OCCC ↓) etc. burden distribution system.But, in one embodiment of the invention, preferably, according to open for the first time great bell be distributed into OCOC, for the second time open great bell be distributed into OO, for the third time open order that great bell is distributed into OCCC carry out circulating burden distribution (1OCOC+1OO ↓ OCCC ↓, that is to say that burden distribution system is 1A+1C), that is, material loading is the system that increases the weight of edge in one-period, re-uses the system that slightly increases the weight of edge or slightly increase the weight of center.In the present invention, it should be noted that, O represents ore, and C represents coke.
The variation of stockline is remarkable to Gas Flow distribution influence, should be by the working of a furnace need to select suitable stockline.In non-limiting example, the stockline of clock-type blast furnace roof is no more than 3.0m the most deeply.When occurring furnace throat temperature high (particularly oxygen enrichment deficiency, when intensity difference), 100mm stockline can fall temporarily.
In addition, in non-limiting example of the present invention, can be according to the variation of the needs of the working of a furnace and smelting condition, select suitable batch weight, under normal circumstances, should fix ore deposit and criticize constant, provisional weight is adjusted variable coke (per) charge, and preferably, provisional weight must not adjust and exceeded 30 batches.
In addition, in non-limiting example of the present invention, owing to being generally contained in the raw material Yi Gunxiang center on great bell 1 upper strata, therefore, add the flux such as antiscales or Wingdale in clock-type blast furnace time, can first fill ore and refill antiscales or Wingdale, forbid antiscales and Wingdale cloth at clock-type blast furnace edge.
In the technique of air-supply, control blast energy is 150～230kJ/s, and blast temperature is not less than 1200 ℃, and air blast oxygen enrichment percentage is not less than 1%.
Because coke nature angle of rest (repose) is lower than the angle of rest (repose) of large grade agglomerate and lump ore, particle segregation.In the process of the roof material distributing of clock-type blast furnace, large grade agglomerate is easily distributed in edge with lump ore, and pellet is easy to Gun Xiang center, and edge is loaded heavier.Coke nature angle of rest (repose) is little, is easily distributed in the Intermediate Gray at deflection center, piles sharp deflection center, ore storage point Fine fraction of ore is many, and ventilation property is poor, after large grade agglomerate and granule level agglomerate load in mixture, when cloth, be easy to, in the sharp position of heap, be partial to center, make central permeable sexual deviation.Therefore, need add and dwindle air port area, strengthen blast energy and blow through center, that is, blast energy is controlled to 150～230kJ/s.For exemplarily explanation, with 1200m
3blast furnace is example, and 18 air ports arrange that Ф 130mm × 1+140mm × 17 change Ф 130mm × 2+140mm × 16 or Ф 130mm × 3+140mm*15 etc. into.Air port area is by 0.275m
2be reduced into 0.273m
2or 0.271m
2, blast energy is brought up to 182kJ/s or 232kJ/s by 145kJ/s.Improve blast energy and be conducive to strengthening smelting, blow through center, enliven cupola well.Can find out from blast energy formula, improve wind-warm syndrome, reduce blast, dwindle air port area and all can improve blast energy, more than calculate is in the situation that keeping wind-warm syndrome and blast constant, to dwindle air port area and the kinetic energy lifting that obtains, as calculated, wind-warm syndrome rises 10 ℃, the blast energy 2kJ/s that only rises, and blast reduces 0.01MPa, the blast energy 8kJ/s that only rises, dwindles air port area as seen to improving blast energy especially obviously with responsive.
In the present invention, for strengthening smelting, take to improve the measure of blast temperature and oxygen enrichment percentage, blast temperature is not less than 1180 ℃ (preferably, blast temperature can be controlled in 1180 ℃～1220 ℃), air blast oxygen enrichment percentage is not less than 1%(preferably, air blast oxygen enrichment percentage can be controlled in 1%～3%), thereby make to utilize the better effects if of granule level agglomerate, can improve combustion intensity.
Under the high strength of clock-type blast furnace is smelted, can improve the top pressure drop low voltage difference of clock-type blast furnace, promote burden direct motion, reduce hanging probability, in one embodiment of the invention, preferably, clock-type blast furnace top pressure can be controlled in 0.1-0.12MPa, and high top pressure operation rate reaches 95-100%.Press by the top of controlling clock-type blast furnace, improved gas utilization rate, arrive furnace roof after gas temperature must reduce, top temperature drop is low is conducive to protect furnace top equipment.Furnace throat ring week (as 6 thermometrics, 8 thermometrics) uniformity of temperature profile, extreme difference is distributed as 300 ℃-600 ℃, 450 ℃ of left and right of average out to, and throat temperature extreme difference is 100 ℃-300 ℃, 220 ℃ of left and right of average out to, this furnace roof ring Zhou Wendu can not cause damage to clock-type blast furnace.In non-limiting example of the present invention, can adopt at little clock and open the little clock equalizing valve of front opening, after opening approximately 1/3, little clock closes; Open front opening great bell equalizing valve at great bell, open the mode of closing after approximately 1/3 at great bell and control the top of clock-type blast furnace and press.
Therefore, the method that clock-type blast furnace according to the present invention utilizes granule level agglomerate to smelt, has overcome the defect that clock-type blast furnace can not utilize granule level agglomerate to smelt, and by adjusting process parameter, has guaranteed normal production, has improved economic benefit.
In addition, the granule level agglomerate in returning mine by recovery enters blast-furnace smelting, has reduced the process cost of screening agglomerate grade.
In addition, by utilizing granule level agglomerate to solve blast furnace materials situation in short supply, reduced raw materials cost.
The method of utilizing granule level agglomerate to smelt to clock-type blast furnace of the present invention below by specific embodiment describes.
Embodiment 1:
With 1200m
3clock-type smelting vanadium-titanium magnetite by blast furnace is the method that example explanation clock-type blast furnace utilizes granule level agglomerate to smelt.
The preparation of granule level agglomerate: agglomerate sintering vibratory screening apparatus 11 under ditch of storing in ore deposit groove 16.1 storage under trestle sieves, the agglomerate of >5mm grade is fallen under ditch on the main belt 18 of material loading, enters into feeding cart 4; The agglomerate (returning mine) of <5mm grade drops into after transhipment belt 17, enter into vibratory screening apparatus 13 through funnel panel turnover device 12 and carry out screening operation, the classification point of vibratory screening apparatus 13 is 3.0mm, the agglomerate of the middle >3mm grade of returning mine is sifted out, entering ore deposit groove 14 stores, newly-built conveyor 15.1,15.2,15.3 etc. or an independent ore deposit groove 16.4 utilizing blast furnace trestle belt that the granule level agglomerate of >3mm is transported under ditch are stored again, for blast furnace; Screen underflow <3mm grade return mine by belt lace or flaw (not shown) enter into transhipment belt 19 return sintering use.
Sieve out granule level agglomerate through aforesaid method, wherein, granule level agglomerate comprises that weight is the agglomerate that 45～55% grade of granule level agglomerate gross weight is 3～5mm, and weight is that the agglomerate of 35～45% grade >5mm of granule level agglomerate gross weight and weight are the agglomerate of 0～20% grade <3mm of granule level agglomerate gross weight.
Clock-type blast furnace is feeded: by after suitable granule level agglomerate obtained above, by transhipment belt 15.1, 15.2, 15.3 are transported under trestle, to store in ore deposit groove 16.4 and store, no longer carry out sieving under ditch, after weighing, enter under ditch on the main belt 18 of material loading, then store ore deposit groove 16.3, pellet in 16.2, lump ore also enters successively on main belt 18 after weighing, finally that under the large grade agglomerate process ditch in storage ore deposit groove 16.1, vibratory screening apparatus 11 sieves, under ditch, vibratory screening apparatus 11 classification points are 5mm, the agglomerate (large grade agglomerate) of screen overflow 5-80mm grade enters on the main belt 18 of material loading after weighing, under ditch, the agglomerate (returning mine) of vibratory screening apparatus 11 screen underflow <5mm grades obtains above-mentioned suitable granule level agglomerate through screening.Granule level agglomerate under ditch on the main belt 18 of material loading, pellet, lump ore, large grade agglomerate enter in feeding cart 4 successively along with belt turns round, in feeding cart 4, from bottom to upper strata, form successively granule level sintering ore bed D, pelletizing ore bed C, lump ore layer B, large grade sintering ore bed A(is shown in Fig. 2), after charged, pass through the furnace roof to clock-type blast furnace on track 7 with hawser, start cloth, and be distributed into heap layer in stove order antithesis.
Be equipped with on the feeding cart 4 of furnace charge after furnace roof, utilize distributor that furnace charge (ore and coke) is poured in little clock 2, open pressure-equalizing and discharging pipe 6; In the time of the air pressure in great bell 1 and ambient atmosphere pressure balanced, open little clock 2, so that ore and coke enter in great bell 1; Close pressure-equalizing and discharging pipe 6, open and all press gas pipe 5; When air pressure within the air pressure in great bell 1 is less than or equal to clock-type blast furnace, open great bell 1, burden distribution, on the correct position of furnace throat, is formed to charge level and heap point 7.
Open after great bell 1, agglomerate, lump ore, pellet, granule level agglomerate enter into respectively in the stove of clock-type blast furnace, the first layer is large grade sintering ore bed and contacts with coke layer, and the second layer, the 3rd layer, the 4th layer are respectively lump ore layer, pelletizing ore bed, granule level sintering ore bed.Granule level agglomerate is positioned at the superiors, prevents from directly contacting with coke layer and bleeding therebetween, makes ventilation property variation; When next round material loading coke layer be distributed in granule level sintering ore bed above, can better improve ventilation property.
Between ore and coke according to open for the first time great bell be distributed into OCOC, for the second time open great bell be distributed into OO, for the third time open order that great bell is distributed into OCCC carry out circulating burden distribution (1OCOC ↓+1OO ↓ OCCC ↓, wherein, O represents ore, C represents coke),, adopt positive layer charging system, successively by ore and coke totally 4 cars pack in great bell, open a great bell and be distributed in stove; Two car ores are opened to great bell to be distributed in stove; Packing one car ore and three car coke pack in great bell again, open great bell and are distributed in stove, adopt aforesaid way to circulate successively.Take this burden distribution system, can reach in one-period and increase the weight of edge, re-use the object that slightly increases the weight of edge or slightly increase the weight of center, the center coal gas of making suitably develops, and suppresses edge coal gas overdevelopment.
Clock-type blast furnace after charging is blown.
Processing parameter and the metallurgical effect of this process are as shown in table 1.
Embodiment 2:
This technical process is with embodiment 1, and processing parameter and metallurgical effect are as shown in table 1.
Comparative example (base period):
This technical process is with embodiment 1, and processing parameter and metallurgical effect are as shown in table 1.
Table 1 clock-type blast furnace uses granule level agglomerate front and back effect comparison
As can be seen from Table 1,1200m
3in the process of clock-type smelting vanadium-titanium magnetite by blast furnace, after use 1.43% and 2.68% granule level agglomerate (accounting for burden structure ratio), main economic and technical indices does not only have variation, smelt but also maintained high loading high strength, working of a furnace stable smooth operation, obtain utilization coefficient raising, the net effect that fuel ratio declines.
In addition, and more than granule level agglomerate usage quantity every day reaches 150t, by using 1t granule level agglomerate to save 100 yuan of calculating of process cost, a 1200m
3clock-type blast furnace can reduce resource expense more than 5,000,000 yuan every year; Therefore, solved the problem of clock-type blast furnace part materials resource scarcitys, reduced the cost that enters to purchase other high price ore, overall economic efficiency is remarkable.
In addition, by utilizing granule level agglomerate to solve blast furnace materials situation in short supply, reduced raw materials cost.
More than describe the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant and combination to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Claims (9)
1. clock-type blast furnace utilizes the method that granule level agglomerate is smelted, and described method comprises the steps:
Charging: the ore that contains granule level agglomerate and coke are joined in clock-type blast furnace;
Air-supply: control blast energy is 150～230kJ/s, and blast temperature is not less than 1180 ℃, and air blast oxygen enrichment percentage is not less than 1%;
Wherein, granule level agglomerate comprises the agglomerate of agglomerate that 45～55% grade is 3～5mm, 35～45% grade >5mm and the agglomerate of 0～20% grade <3mm by weight percentage.
2. method according to claim 1, wherein, based on the gross weight of ore, the weight of described granule level agglomerate is 0.5～10.0%.
3. method according to claim 1, wherein, described ore also comprises large grade agglomerate, lump ore and pellet, and in the time joining in clock-type blast furnace, ore bed is followed successively by large grade sintering ore bed, lump ore layer, pelletizing ore bed and granule level sintering ore bed from top to bottom.
4. method according to claim 1, wherein, the batch weight of every batch of ore is 20t～25t, and control coke load is 4.2t/t～5.0t/t.
5. method according to claim 1, wherein, in the time that ore and coke are carried out to cloth, is distributed into OCOC, opens great bell for the second time and be distributed into OO, open the order that great bell is distributed into OCCC for the third time and carry out circulating burden distribution according to opening for the first time great bell; O represents ore, and C represents coke.
6. method according to claim 1, wherein, in the step of charging, utilizes distributor that ore and coke are poured in little clock, opens pressure-equalizing and discharging pipe; In the time of the air pressure in great bell and ambient atmosphere pressure balanced, open little clock, so that ore and coke enter in great bell; Close pressure-equalizing and discharging pipe, open and all press gas pipe; When air pressure within the air pressure in great bell is less than or equal to clock-type blast furnace, open great bell, so that ore and coke enter in clock-type blast furnace.
7. method according to claim 1, wherein, utilizes Ma Jishi distributor to carry out cloth to ore and coke.
8. method according to claim 1, wherein, described method also comprises: the furnace top pressure of controlling clock-type blast furnace is 0.10～0.15MPa, and high top pressure operation rate is not less than 95%.
9. method according to claim 1, wherein, coke combustion intensity is 1.0～1.2t/m
3d, integrated smelting intensity is 1.4～1.5t/m
3d.
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| CN104152614A (en) * | 2014-08-26 | 2014-11-19 | 攀钢集团西昌钢钒有限公司 | Distribution method of blast furnace burdens |
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