CN86103119B - Blast furnace blowing process and its appts - Google Patents
Blast furnace blowing process and its appts Download PDFInfo
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- CN86103119B CN86103119B CN86103119A CN86103119A CN86103119B CN 86103119 B CN86103119 B CN 86103119B CN 86103119 A CN86103119 A CN 86103119A CN 86103119 A CN86103119 A CN 86103119A CN 86103119 B CN86103119 B CN 86103119B
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Abstract
The present invention relates to a blast furnace opening process for supplying air to a furnace bottom, which belongs to the technical field of blast furnace iron making. The process mainly comprises: a one-off furnace bottom air supply pipeline arranged at the inner part of a blast furnace hearth in front of a baking furnace is used for blast furnace baking and ignition by a method of supplying the air to the furnace bottom, and other corresponding technical operation measures are auxiliary. The process has the advantages of enhanced furnace baking quality and furnace baking speed, rapidly enhanced temperature of the lower part of the furnace hearth after the furnace is opened, safe guidance of coal gas to burn the hot-air furnace and assurance of rapid, smooth, convenient and economic furnace opening.
Description
The present invention relates to technical field of blast furnace ironmaking.
Behind the blast furnace opening, the coke of cupola well bottom is warmed up on the smooth and easy needed temperature that flows of slag iron equably, successfully gone out first and second stove molten iron, this is the key of blow-on success or not, also is the main standard of examination blast furnace opening state of the art.
Though at present the full coke open furnace method of promoting is had large improvement than the sleeper blow-on method of gradually eliminating, the temperature that also is difficult to guarantee the cupola well bottom bring up to equably rapidly slag iron Channel Group temperature required more than so that have following weak point;
1. can not thoroughly solve the problem of the superfluous and bottom shortage of heat of blow-on initial stage blast furnace top heat, thereby be difficult to guarantee the quality of first and second stove molten iron after the blow-on and reduce that the blow-on consumption is burnt to be measured.
2. the cinder notch below is a hot coal air-flow dead angle area with the furnace bottom edge annular zone of iron mouth, and before the second stove iron, a large amount of slag iron can solidify in this zone or viscosity increases, and influence blast furnace and more promptly carry out the transition to normal smelting after the blow-on.
3. blow-on initial stage, owing to exist the internal cause and the external cause of gas explosion, the time of drawing coal gas is " peaceful evening is not early " generally all.
4. full stove blow-on coke ratio height, empty Jiao of follow-up material is also more, in order to improve the flowability of slag, also will use fluorite more, causes waste economically.
The U.S.2468738 patent provides a kind of downdraft method of blast furnace when answering wind that is applicable to long-term or short-term banking.The essential characteristic of this method be between blast-furnace hot-air surrounding pipes and iron notch, be equipped with one have valve and with the pipeline of air port peep hole UNICOM.During furnace compound wind, utilize this pipeline that combustion air is introduced iron notch and assist blowing.Though this method has certain effect near the cupola well temperature of lower that improves the iron mouth, still: (1) this device can only make wind be blown near the iron mouth 0.5 meter with interior bag-like region, and after blow-on during winding-up iron mouth, iron mouth near zone heats up very fast.When stove blow-on newly, need not make an unnecessary move.(2) this device still can not solve and eliminate hot coal air-flow dead angle area, early draws coal gas, accelerate problem such as baker speed.
At above-mentioned these situations, the objective of the invention is:
1. by improving method to the furnace bottom balanced ventilation, the temperature of guaranteeing the cupola well bottom can evenly, promptly bring up to slag iron Channel Group temperature required on, thoroughly solve the principal contradiction of blow-on initial stage smelting process.
2. draw coal gas ahead of time than existing blow-on technology and burn hotblast stove, reclaim the high coal gas of calorific value more, reduce topsoil, accelerate to carry out the transition to the speed of ordinary production.
3. improve the quality of blast-furnace hot-air baker, accelerate the speed of hot-blast baker.
Design principle of the present invention and substance are: can break through partial layer gas film thermofin on the solid surface according to jet flow, reduce " thermal resistance " of transmission of heat by convection between hot blast and the cryogenic solid, thereby accelerate baker speed; Make the coke of cupola well bottom lean on the principles such as intensification equably of self burning rapidly, following two measures be provided at the blow-on initial stage:
1. before blast oven, earlier at one in the furnace bottom device of the cupola well inside pipeline of can at the bottom of the disposable State of Blast Furnace of the even jet flow of furnace bottom, blowing.
2. adopt a series of and the baker that adapts to the blast furnace downdraft, the blow-in method of lighting a fire, draw coal gas, furnace condition temper.
Figure one is the structural representation of air-supply pipeline at the bottom of the State of Blast Furnace.
Figure two passes through the big cover of cinder notch when the downdraft comb is supplied with cold wind with the outer airduct of stove, the scheme of installation of upright airduct top elbow.
Specific embodiments of the present invention is as follows:
One. the structure of air-supply pipeline is seen figure one and figure two at the bottom of the State of Blast Furnace.(1) blast furnace lining among the figure, (2) iron mouth medullary ray, (3) air port medullary ray, (4) go up the cinder notch medullary ray, (5) iron mouth, (6) air-supply comb, (7) pad brick, (8) comb spurt hole, (9) upright blast pipe, (10) the outer airduct of stove, (11) space in the big cover of cinder notch, (12) cupola well, (13) bell and spigot, (14) steel bar, the bolt that (15) cinder notch puts greatly.
Air-supply comb (6) among the figure is that an arc (or broken line) pipe and some straight tubes are formed.The specification φ of pipe (104～150) * (2～4) mm, the radical n=of straight tube (cupola well diameter (rice)-(0.3～0.4)) ÷ (0.25～0.4)-1.In the formula: (0.3～0.4) is arc (or broken line) the tube hub line at comb two ends and 2 times of cupola well wall spacing, rice; (0.25～0.4) is the centreline spacing of adjacent straight tube, rice; (1) is the individual difference of centreline spacing (n+1) that n root straight tube and two ends arc (or broken line) pipe form, promptly-1=n-(n+1).The permission fluctuation range of the centreline spacing of adjacent straight tube when make installing be ± 0.03 meter.
On curved pipe and every straight tube 2～3 row's spurt holes (8) are arranged, the aperture of spurt hole is φ 12～20mm, the adjacent spacing 50～180mm of every round; The available old refractory brick of pad brick (7), the height of pad brick is selected for use by different requirements, generally at 0～150mm; Specification φ (104～200) * (2～4) mm of upright blast pipe (9), form by 1～4, when using hot-blast baker, the material of downdraft pipeline preferably adopts the low-alloy seamless steel tube for boiler of permission working temperature 〉=550 ℃, the upper end of pipe has elbow, the curved pipe UNICOM of lower end and air-supply comb (6).
Figure one and figure two have represented respectively from the air port air-supply with from two schemes of cinder notch air-supply.
In the following cases, upright blast pipe (9) is communicated with 2～4 air ports: when＜1 〉, blast furnace usefulness hot-blast baker and hot wind ignition blow-on (hot blast temperature energy 〉=700 ℃ time).＜2 〉, at＞255m
3On the blast furnace, during without hot-blast baker and hot wind ignition blow-on.
≤ 255m
3～100m
3On the blast furnace, during without hot-blast baker and hot wind ignition blow-on, both can be from air port air inducing, also can be from cinder notch air inducing, selected by following principle: when hotblast stove can be supplied with＞200 ℃ hot blast blow-on igniting, in order to improve the cupola well temperature of lower as early as possible, should be from air port air inducing; When hotblast stove cold wind house steward far away apart from blast furnace, set up the induced exhaust workload when big, from air port air inducing save trouble (guide to cold-air duct and valve on the blast furnace table, the high pressure combustion air of accelerated bake major groove and skimmer can be provided when ordinary production, be long-term useful device); Earlier when the downdraft, each air port is all stifled little with mud from cinder notch, and when damping down cut off the furnace bottom wind regime, the possibility that cupola well coal gas flows back in hotblast stove or the cold-air duct was very little, and is when new factory goes into operation, when lacking the technician that knowhow is arranged, better from cinder notch air inducing.
Two. the assembling of air-supply pipeline at the bottom of the State of Blast Furnace: before blast oven, weld according to assembling on following difference requirement and the furnace bottom of program in cupola well:
1. adopt hot-blast baker and igniting blow-on person more than 700 ℃, air-supply comb (6) level of answering is installed, and the pad brick (7) that placement 60～80mm is high below comb (6), and the spurt hole (8) that makes comb is towards oblique positioned beneath.
2. can not be with hot-blast baker and firer more than 700 ℃, air-supply comb (6) the pad brick (7) that only placement 130～150mm is high below iron mouth one side, cinder notch one side is placed directly on the bottom brick, makes the square obliquely device of spurt hole of comb.
3. the elbow with upright airduct (9) upper end stretches into 20～50m/m in the tuyere small sleeve, (the elbow external diameter is littler by 2～3mm) than air port internal diameter, end with the steel bar of two φ 4～5m/m is welded on the two-end-point of elbow internal diameter again, and the other end of steel bar covered (not shown) from being fixed on peep hole after the air port peep hole is drawn tension, then again the lower end mouth of pipe of upright blast pipe (9) is connected with the blast inlet on the air-supply comb (6) and welded the location.The optimal number of upright blast pipe (9) is: 100～750m
3Blast furnace with 2～3,＞750m
3Blast furnace with 4, near roughly equidistant 90 °～180 ° the circumference that is distributed in the cinder notch in 2～4 air ports of upright blast pipe air inducing.
4. supply with cold wind if pass the big cover of cinder notch to downdraft comb (6) with the outer airduct of stove, then by shown in the figure two the outer airduct (10) of stove being stretched into cupola well (12) 20～160mm through the big cover of cinder notch (11), be inserted in bell and spigot (13) lining of the elbow of upright blast pipe (9), use steel bar (14) to be enclosed within on the bell and spigot (13) then and tighten, again steel bar is pulled out the stove external fixation on the bolt (15) of the big cover of cinder notch.
Three. to the downdraft baker: when adding heat drying furnace with the hot blast jet flow, hot blast is introduced from the air port through upright blast pipe (9), be sprayed on to declivity through the spurt hole (8) of air-supply comb (6) on the upright brick wall on covering of the fan arc limit of about 240 ° of furnace bottom and cupola well bottoms, make these be difficult to rapidly baking zone well prior to other regional bakings with existing furnace technology.
Four. light a fire to downdraft:
1. during with the hot wind ignition blow-on, block the half air port earlier, sending temperature again is 200～250 ℃ hot blast, the full blast blow-on material of packing into, and when being filled to the stockline of regulation, data such as the angle of rest (repose) of charge level and collision zone are measured in blowing-out.After the mensuration, send the coke before hot blast more than 700 ℃ is lighted furnace bottom and air port from the air port, (, when the blow-on material is filled to shaft top, can when continuing charging, send the hot blast more than 700 ℃) if do not need to measure the data of charge level and collision zone.When treating the bright flame of iron mouth ejection, the temperature drop to 500 of keeping watch～550 ℃ are looked the working of a furnace again and are improved wind-warm syndrome gradually after the air-supply of furnace bottom comb up to stopping, and are 100～120 minutes to the Best Times of downdraft.
2. as if the hot wind ignition blow-on that does not have more than 700 ℃, then with the stifled upward mud in each air port and after smashing tightly, disclose out an aperture again, the area of aperture is about about 50% of former air port area, then lights the coke of furnace bottom again with one of following method;
(1) attracts cold wind (valve being housed) from the cold wind house steward at induced exhaust, airduct outside stove (10) is to downdraft comb (6) air-supply (also can be directly being sent＜200 ℃ cold wind to the downdraft comb by the air port), in order near the bearth brick lining the cooling air-supply comb.Blow after 3～5 minutes, 20～100 kilograms kerosene or diesel oil are poured into air-supply comb (6) through the elbow of upright blast pipe (9) upper end, after shutting the oil port on the air-supply pipeline, again the butyraceous wood sawdust is added in the steel pipe of iron mouth, and burn the logical a spot of oxygen of red oxygen hose with front end, oil-containing wood chip in the iron mouth steel pipe is blown in the stove, and the oil-containing coke at the bottom of the ignition furnace send 0.49 * 10 to the downdraft comb subsequently
4The little wind of Pa, and put in the oxygen hose of red heat strengthens amount of oxygen gradually, continues igniting combustion supporting, when the furnace bottom coke is orange, extracts the air output that oxygen hose strengthens the furnace bottom comb gradually.
(2) borrow the injection of high pressure oxygen to suck geseous fuel such as acetylene gas with the oxygen hose that has injecting tube, after outside blast furnace, lighting, oxygen hose is stretched in the stove from iron mouth steel pipe, light the coke of furnace bottom.The igniting of this method rapidly, but only in cupola well the water content of coke＞12% o'clock just be necessary.
(3) in the cupola well bottom of distance iron mouth steel pipe internal orifice 1/2 cupola well radius to the cinder notch, load onto the long electric stove wire of 400～800mm of 2～16 parallel connections in advance, guide to outside the stove from iron mouth steel pipe and to be connected, switch on after the blow-on, utilize the high temperature dot burner bed coke charcoal of electric stove wire with the stove external power.
(4) if before dress blow-on material, bottom temperature is at 100～200 ℃, and do not need to survey the furnace throat charge level, then can be before dress blow-on material, earlier from the tuyere big sleeve 15～50 kilograms of oil-containing firewoods being added cupola well bottom centre to the air-supply comb (6) of cinder notch below, firewood is upwards conducted heat along with the heat of furnace bottom deep layer bricking and heat up, thereby in loading furnace process, ignite voluntarily.(as can not spontaneous combustion, the logical slightly oxygen of available red heat oxygen hose or with burning red drill rod) from the centerfire of iron mouth insertion cupola well.
3. increasing air quantity: the furnace bottom igniting is after 3～5 minutes, from the iron mouth, see when the furnace bottom coke has burnt glow, can strengthen the air output of furnace bottom gradually, treat the flame of iron mouth ejection bright when limpid (generally after igniting 15～20 minutes), through the air port with 50～60% of full blast amount, (i.e. 25～36% the blast air-supply of pressing with full blast) held concurrently to downdraft, or the valve of standard-sized sheet from the induced exhaust of cold wind house steward air inducing, to downdraft.
Five. cut off the processing of furnace bottom wind regime and iron mouth and cinder notch:
When the iron mouth and to spray white bright little coke button, iron mouth flame white bright dazzling, and when each air port is very bright, (greatly about back 100～120 minutes of furnace bottom igniting), elder generation's checking or damping down, the fastening steel bar that will connect the outer airduct of upright blast pipe (9) and stove again cuts off, with hammer drill the elbow of upright blast pipe is thrown into toward the stove center, till elbow breaks away from tuyere small sleeve or does not hinder by good little cinder notch, install then the air port spy on port lid or remove the outer airduct of stove after by good little cinder notch, continue winding-up iron mouth, see slag until the iron mouth, can pull out the stifled iron mouth of going up of iron notch steel pipe.Cinder notch blocks when then jetting to the white bright coke of continuous ejection.Behind the stifled iron notch 3～5 hours for the first time, beat tapping outlet and tap a blast furnace and slag tap, every about 2 hours, beat tapping outlet once later on.The back winding-up iron mouth that at every turn taps a blast furnace blocked the iron mouth in 1～2 minute again, opened cinder notch winding-up 2～5 minutes immediately.
Six. draw the method for coal gas:
After stockline continue to descend, in throat temperature＜400 ℃, furnace top pressure＞0.29 * 10
4During PPa, add the wet coke of 1～2 batch of water content＞18% toward the stove internal upper part.(if stockline full, also available truck adds half truck water toward stove in) draws coal gas by normal procedure immediately, (draw before the coal gas, keep preceding temperature＞700 of Combustion of Hot Air Furnace mouth ℃).At this moment want half-open gas gate valve control enter the coal gas amount of hotblast stove, and open the gas bleeding valve on fly-ash separator or the washing tower slightly, wait gas flame to stablize glow after, add full coal gas amount more gradually, the complete shut-down gas bleeding valve.
Seven. strengthen air quantity, increase the weight of coke load, the controlled chilling water yield and connect the qualified molten iron of two stoves after, similar to the adjustment of the working of a furnace to existing start-up of the furnace, but should note following some:
1. under the situation that furnace temperature allows, should add the full blast amount quickly, promptly after the first stove molten iron is qualified, take the circumstances into consideration to improve wind-warm syndrome and the corresponding air quantity that adds to about 70% of full blast amount than existing blow-on technology; After the second stove molten iron is qualified, looks " cold and hot " trend of the lifting trend and the bits of two stove pig iron sulphur content, or improve wind-warm syndrome or add air quantity, and disclose stifled mud, air quantity and wind-warm syndrome in the part air port add complete after, disclose the stifled mud in whole air ports.
2. owing to early draw coal gas, more existing blow-on technology has bigger wind-warm syndrome potentiality, so under the prerequisite that does not influence direct motion, should improve hot blast temperature comparatively fast, earlier.
3. after the first stove molten iron was qualified, apparent wind temperature potentiality size increased the weight of coke load more than 0.3, pressed the degree of iron, slag " thermotropism " later on, in time increased the weight of the coke load of follow-up material, prevented hot hanging or went out high silicon off-iron or casting iron.
4. before the blow-on, all hotblast stove will improve ball top temperature as far as possible, does not dry by the fire a hotblast stove less.
Major advantage of the present invention is as follows:
1. improve the stove quality of blast furnace, accelerate baker speed, make the sector region of about 240 ° of cupola well bottoms can be better than the baking earlier of other zones soon at short notice, obtain the unapproachable superior effect of existing baker.
2. guarantee that the cupola well bottom temp is even, promptly bring up on the needed temperature of slag iron Channel Group that compare with the full coke open furnace method, the blow-on coke ratio can reduce by 10～40%; And can not guarantee off-iron, and reached normal day output 90% or more by 10 days in (big blast furnace) without 5 days (small furnace) after oxygen burning iron mouth, the blow-on, guarantee that blow-on is rapid, smooth, easy, economical.
3. early draw coal gas in 3 hours at least in advance with existing blow-on technology and burn hotblast stove, reclaim the high coal gas of calorific value more, reduce topsoil, accelerate to carry out the transition to the speed of normal smelting.
4. simple and easy to do, the downdraft pipeline all can oneself be made in common ironworks and install, and operation is easily grasped in the stove, and close when stokehold workload and ordinary production, labour intensity alleviates greatly.
Embodiments of the invention: hentriaconta-day to November 2 in October, 1985, ironworks, Mouping, Yantai City, Shandong Province 15m
3Blast furnace has adopted blow-on novel process of the present invention, though current blow-on is an initial testing, (spraying hot-blast baker) to furnace bottom, after the blow-on in 13 hours wind-warm syndrome have only 330～500 ℃, and unplanned power failure also took place in the centre, but the effect of current new blow-on method is still very remarkable.Main condition are as follows:
The full oven coke of blow-on than by this factory in the past 8.0 drop to 4.64, reduced by 42%, in 13 hours after igniting, hot blast temperature has only 330～500 ℃.Wherein there were 7 hours 30 minutes to be lower than 400 ℃, when blow-on (normal wind-warm syndrome many) at 500～800 ℃, under the situation that the heat income significantly reduces, first stove and the second stove iron but all are qualified low silicon steel-refinings, L
sL with ordinary production
sBe worth similarly, see following table for details:
| S i% | S% | L s | Apart from beginning from the time of air port air-supply | |
| First slag after the blow-on | 1.75 | 6 hours 20 minutes | ||
| The first stove iron after the blow-on | 0.50 | 0.040 | 44 | 7 hours 25 minutes |
| The open circuit back second stove iron | 0.425 | 0.051 | 8 hours 28 minutes |
In addition, from blow-on to changing ordinary production over to, never burn the iron mouth with oxygen, and the iron mouth is easy in 2 minutes with manually opening, close when consuming manpower and ordinary production, the above-mentioned fact proves that fully this blow-on novel process can guarantee that the cupola well temperature of lower reaches on the required temperature of slag iron Channel Group rapidly, equably.
2. count during from the air port putting in blast, stop to add empty Jiao in 24 hours in the follow-up material fully, only add the regular burden(ing) that coke ratio is 867 kilograms of/ton iron; Rose in 32 hours, the coke load of follow-up material is exacerbated to about 80% of normal smelting, and smelts with the full blast amount.(this factory's combustion intensity more than 2.6, utilization coefficient about 5.0); When the coke load that played regular burden(ing) in 48 hours is added to ordinary production more than 90%.As mentioned above, if not power failure outside the plan, strengthening air quantity also can be faster with the transition speed that increases the weight of coke load, can shift to an earlier date about 6 hours more at least.
3. current blow-on is lacked than blow-on in the past and is used 18～28 coke charge charcoals, uses qualified coke 4-6 ton less, is worth 800～1200 yuan, uses fluorite less, and manganese ore useless does not go out the scrap iron and the trade mark and is higher than Z＜`; ; 14`〉casting iron; And the devices such as downdraft pipeline of test usefulness have only been spent less than 700 yuan entirely by this factory's self-control, and the saving of payment coke is worth also can save 100～500 yuan, adds to go out scrap iron less, uses fluorite less, approximately saves about 1000 yuan than former blow-on.Can expect that blast furnace is big more, the effect of saving when adopting blow-on technology of the present invention is just big more.
4. simple and feasible.Except that the manufacturing of the downdraft pipeline of new addition, install the simple and feasible, generally be worth the blast furnace section chief of 3～5 years classes, be easy to carry out start-up of the furnace according to technology point of the present invention in that once back on probation is independent.
5. at another 15m
3During blow-on, press preceding method and add two batches of drenched coke on the blast furnace, obtained safety, successfully the effect of early drawing coal gas.
| S i% | S% | L s | Apart from beginning from the time of air port air-supply | |
| First slag after the blow-on | 1.75 | 6 hours 20 minutes | ||
| The first stove iron after the blow-on | 0.50 | 0.040 | 44 | 7 hours 25 minutes |
| The second stove iron after the blow-on | 0.425 | 0.051 | 8 hours 28 minutes |
Claims (19)
1, a kind of blast furnace process to downdraft comprises baker, igniting, the adjustment working of a furnace, draws main programs such as coal gas, it is characterized in that:
When 1. using hot-blast baker, adopt the jet flow type of heating, baking blast furnace hearth bottom.
2. before the air-supply igniting of air port or simultaneously, utilize the downdraft device that is pre-installed in the stove to downdraft, igniting.
2, according to the described blast furnace process of claim 1, it is characterized in that it is that hot blast is introduced from the air port through upright blast pipe (9) that described jet flow adds heat drying furnace, be sprayed on the furnace bottom to declivity from air-supply comb (6) spurt hole (8), side is sprayed on the upright brick wall on covering of the fan arc limit, cupola well bottom.
3, according to the described blast furnace process of claim 1, it is characterized in that described to downdraft, igniting, if the schedule of operation when quoting hot blast is:
1. after having adorned the blow-on material when installing to shaft top (or blow-on material), send into the hot blast more than 700 ℃ from the air port.
2. the flame that sprays at the iron mouth becomes when becoming clear, and wind-warm syndrome is dropped to 500～550 ℃.
3. the Best Times to downdraft is 100～120 minutes.
4, according to the described blast furnace process of claim 1, it is characterized in that described to downdraft, igniting, if the schedule of operation when not quoting hot blast is:
1. send into cold wind from the cold wind house steward to downdraft comb (6), or send into＜200 ℃ cold wind to downdraft comb (6) by the air port, after 3～5 minutes, elbow through upright blast pipe (9) upper end is poured kerosene or diesel oil into, shut the oil port on the blast tube, again the oil-containing wood sawdust is added in the steel pipe of iron mouth, burn the logical oxygen of red oxygen hose with front end, the oil-containing wood chip is blown in the stove, send 0.49～0.98 * 10 to downdraft comb (6) subsequently
4The little wind of Pa, and light the furnace bottom coke with the oxygen hose of red heat, strengthen amount of oxygen again.When the furnace bottom coke is the tangerine look, extract oxygen hose, and strengthen the air output of downdraft comb (6) gradually.
2. when the water content of furnace bottom coke＞12%, a kind of in available following two kinds of methods:
A) inhale the telescopic oxygen hose with having to penetrate, spray geseous fuel such as sucking acetylene, after lighting oxygen hose is stretched into cupola well from iron mouth steel pipe and light the furnace bottom coke.
B) before the baker, after installing the downdraft comb, on the furnace bottom of cupola well center to the cinder notch, set up 2～16 electric stove wires in parallel, draw outside the stove, during blow-on electric stove wire connected electric point burner bed coke charcoal from iron mouth steel pipe.
3. before adorning the blow-on material, if bottom temperature is at 100～200 ℃, and do not need to survey the furnace throat charge level, during collision zone, can be from the furnace bottom sector region of cupola well bottom centre to the cinder notch below of in the tuyere big sleeve oil-containing firewood being packed into, if adorned the blow-on material, the furnace bottom coke is not spontaneous combustion as yet, the oxygen hose of available red heat leads to minor amounts of oxygen, stretches into furnace bottom ignite firewood and furnace bottom coke from iron mouth steel pipe.
5, according to the described blast furnace process of claim 1, it is characterized in that the described coal gas method of drawing, be after stockline continue to descend, furnace top gas temperature＜400 ℃, stock gas pressure＞0.29 * 10
4During temperature in Pa and the Combustion of Hot Air Furnace mouth＞700 ℃, add the wet coke of 1～2 batch of water content＞18% earlier to furnace throat, also available truck or batch can add half car (jar) water, then draw coal gas by the normal running program.
6, according to the described blast furnace process of claim 1, it is characterized in that the described adjustment working of a furnace is the degree according to slag iron " thermotropism ", the size of wind-warm syndrome potentiality, permeability of stock column exponential sum blanking situation, more existing blow-on technology adds the full blast amount quickly, in time increases the weight of coke load with the full blast gentleness.
7, a kind of when blast furnace opening to the device of downdraft, it is characterized in that downdraft comb (6) and upright blast pipe (9) that this device is processed into by steel pipe form, downdraft comb (6) is made up of pipe and the some roughly close straight tubes of adjacent spacing of an arc or broken line shape, on arc or folding linear tube and every straight tube, it is the spurt hole of 12～20mm of 50～180mm that 2～3 row's adjacent holes spacings are all arranged, the upper end of upright blast pipe (9) in the air port or cinder notch height place an elbow is arranged, the arc or the folding linear tube UNICOM of lower end and air-supply comb (6).
8,, it is characterized in that described straight tube radical=(cupola well diameter (m)-(0.3～0.4)) ÷ (0.25～0.4)-1 according to the described device of claim 7 to the blast furnace downdraft.
9,, it is characterized in that the optimal number of described upright blast pipe (9) is: 100～750m according to the described device of claim 7 to the blast furnace downdraft
3Blast furnace is with 2～3,＞750m
3Blast furnace with 4, these upright blast pipes should roughly be distributed near two cinder notch 90 °～180 ° the circumference range equidistantly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN86103119A CN86103119B (en) | 1986-04-28 | 1986-04-28 | Blast furnace blowing process and its appts |
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| CN86103119A CN86103119B (en) | 1986-04-28 | 1986-04-28 | Blast furnace blowing process and its appts |
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| CN86103119B true CN86103119B (en) | 1987-10-14 |
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| CN101671751B (en) * | 2009-10-14 | 2011-01-26 | 首钢总公司 | Quantification blow-in method for blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899430B (en) * | 2012-09-19 | 2014-12-17 | 攀钢集团攀枝花钢钒有限公司 | Multipoint stereoscopic ignition device and method for blast furnace blow-in and blast furnace containing the device |
| CN104894391B (en) * | 2015-06-10 | 2017-02-08 | 赤峰富邦铜业有限责任公司 | Cold metal blowing-in operation method of oxygen-enriched side-blown bath copper smelting process |
| CN104878142A (en) * | 2015-06-17 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Method for determining whether to increase blast volume or not during recovery of furnace conditions of blast furnace |
| CN104928427B (en) * | 2015-07-01 | 2023-07-04 | 新疆八一钢铁股份有限公司 | Blast furnace baking air guide pipe device |
| CN115261532B (en) * | 2022-07-26 | 2024-01-02 | 广西钢铁集团有限公司 | Method for constructing initial airflow of large blast furnace |
-
1986
- 1986-04-28 CN CN86103119A patent/CN86103119B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671751B (en) * | 2009-10-14 | 2011-01-26 | 首钢总公司 | Quantification blow-in method for blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN86103119A (en) | 1987-09-30 |
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