CN1279191C - Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same - Google Patents
Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same Download PDFInfo
- Publication number
- CN1279191C CN1279191C CN 200510038907 CN200510038907A CN1279191C CN 1279191 C CN1279191 C CN 1279191C CN 200510038907 CN200510038907 CN 200510038907 CN 200510038907 A CN200510038907 A CN 200510038907A CN 1279191 C CN1279191 C CN 1279191C
- Authority
- CN
- China
- Prior art keywords
- shaft furnace
- air
- combustion chamber
- temperature
- oven dry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention discloses a control method for heat energy in a shaft furnace and an internal-combustion pelletizing shaft furnace for realizing the method. By thoroughly discarding the technological layout idea of adopting an external combustion chamber in a traditional shaft furnace, a combustion chamber is slickly arranged in a centre position in the horizontal direction of the internal part of the shaft furnace, and directly positioned on a steel structure furnace body supporting frame at the lower part of a furnace body; an air guiding passage is arranged between the walls of the combustion chamber and the shaft furnace, a guided air volume regulating valve is arranged in the air guiding passage, and a cold air mixing device is also arranged on the top of the combustion chamber. The present invention effectively solves the critical problems encountered in the large-scale development of traditional shaft furnaces (such as limitation to the structure size of water cooling beams of air guide walls, structural design problems of a toothed roll discharge machine which are caused by the thermal deformation of furnace bodies, etc.), which takes a critical step on the road of the large-scale development of shaft furnaces; in addition, the internal-combustion pelletizing shaft furnace of the present invention can annually produce more than 100 million tons of acidic oxide pellets.
Description
Technical field the present invention relates to heat energy control method in the vertical furnace of producing the acidic oxidation pellet in a kind of field of smelting, the heat balance principle of this method utilization science, with cooling air, combustion air, roasting wind and dry wind " unification of four wind ", all gases is communicated with each other, balance coordination.The invention still further relates to this method of application and produce the improvement of acidic oxidation pellet shaft furnace producing the equipment of blast furnace ironmaking raw material, particularly shaft furnace process.
The background technology pellet is a kind of raw material that is used for blast furnace ironmaking, its basic production technology is after the smart powder of iron is added an amount of tamanori, manufacture the spherical particle of 6～16 millimeters of diameters by pelletizer, dry then, roasting, become the iron-bearing material that physical and chemical indexes meets the iron-smelting blast furnace production requirement.The mode of production of acidic oxidation pellet has multiple, and the shaft furnace process production technique is the common methods that is widely used in medium and small iron and steel enterprise or mine.Its production is from preparing burden, dry, make ball, to adding shaft roasting, arriving discharge, refrigerative process again, wherein critical process roasting process in stove.The maximum characteristics that shaft furnace process is produced the acidic oxidation pellet are that its one-time investment is low, and energy utilization rate is high and can make full use of low-calorie secondary energy etc. again.Its output and quality can both satisfy the requirement that medium-sized iron and steel enterprise blast furnace is produced usually again, facts have proved shaft furnace process due status and effect in pellet is produced.
Yet shaft furnace process is produced the defective that the acidic oxidation pellet also exists many its development of restriction.The reasonableness of shaft furnace body part production technique, the advance of production unit influences and has restricted quality and the scale that pellet is produced.The process structure present situation and the equipment deficiency that at first are the shaft furnace body have limited its possibility that maximizes and produce to a great extent.The size of shaft furnace is calculated with the sectional area of firing section, has 8 square metres, 12 square metres etc. usually, and its yearly capacity is generally ten thousand tons of 40-50, and the single seat shaft furnace of present domestic maximum is 16 square metres, and year producing a pellet ability only is about 700,000 tons.The 2nd, shaft furnace is comparatively harsh to relative other pellet production method of the requirement of raw material.Except that domestic indivedual enterprises in test with addition of (greater than 30%) rhombohedral iron ore is at high proportion produced oxide pellet, all at present shaft furnaces all require the smart powder of the magnet of higher proportion could steady quality ground production pellet.
The top of Classical Shaft Furnace is cloth mouth and green-ball drying bed, is added in the stove by the cloth mouth through the green-ball that pelletizer is made, and finishes oven dry, heats up at drying bed; The middle part is a firing section, and fuel and combustion air produce high-temperature gas two external combustion chambers burn, through bocca, make high-temperature gas enter shaft furnace, and pellet in the stove is carried out roasting, oxidation, and high-temp waste gas enters dryer section; The bottom is the discharge position of finished ball nodulizing, and the finished ball nodulizing of discharge is sent to the blast furnace stock ground after the cooling apparatus cooling.The traditional shaft furnace structure of this kind exists many defectives, the main performance in the following areas:
1. because external combustion chamber is in the shaft furnace middle part, its heavy and huge volume must rely on firm factory building platform to support;
2. external combustion chamber and shaft furnace body are owing to the difference of temperature, and its interface easy deformation, cracking cause gas leakage and burn with anger;
3. air-guiding wall is in mid-way in the stove, and heavy body of wall relies on the hollow girder steel (being commonly called as water beams) that constantly passes to water coolant to support, and water beams is easy deformation, wearing and tearing in long hot environment, cause the damage of air-guiding wall;
4. the processing set-up of air-guiding wall and water beams in the stove, becoming influence the biggest obstacle that shaft furnace maximizes, and makes it and not continue to enlarge furnace space above the ability to bear of water beams;
5. the discaling roll discharge apparatus length that is in discharge position, body of heater bottom is bigger, is in for a long time under the hot environment, bears bigger bending load, also easy deformation, cracking, and change very difficulty, equally also be the major obstacle that influence the shaft furnace maximization.
6. oven-fresh finished pellet temperature is very high, reaches 500～600 degrees centigrade (even higher), needs just can be sent to blast furnace system after the apparatus cools through the specialized designs manufacturing;
7. make a general survey of the process structure of whole Classical Shaft Furnace, wherein cooling air, combustion air, roasting wind and dry-heat air relation influence each other, and make the heat energy of discharge finished ball can not get well reclaiming and utilizing, and cause energy dissipation, aggravating working environment.
In the process layout of Classical Shaft Furnace, all kinds of air channels are separate, and complex structure owing to shaft furnace thermally equilibrated requirement up and down, can not strengthen the flow of cooling air quantity in theory, and causing the discharging finished product is hot-bulb, causes the wasting phenomenon of heat resource.Because the temperature of the finished ball nodulizing that shaft furnace is discharged is higher, reach 500 ℃～600 ℃ (even higher), not only taken away the heat energy of a large amount of preciousnesses, can't in the refrigerative process, effectively be utilized, and the equipment that will dispose the specialized designs manufacturing is forced the finished ball nodulizing just can be sent to blast furnace system after the cooling, proposed very high requirement for the cooling and the transportation equipment of finished ball nodulizing, also give to keep on-the-spot good working environment to bring very big difficulty.
In view of this, domestic a lot of enterprise and technical study exploitation unit all carry out many-sided improvement and test in this two big defective at shaft furnace, produce the equipment and the defective workmanship of pellet in the hope of solving shaft furnace process to a certain extent, in shaft furnace is produced, increase the test of red ore deposit ratio etc. as TCS shaft furnace, certain company, shaft furnace process is produced promoting the use of of pellet played certain promoter action.
But, shaft furnace process pellet production technique is improved completely, also must fundamentally solve and improve the inherent defect of shaft furnace, make full use of original advantage of shaft furnace, achievement in conjunction with modern industrial technology, restudy a kind of brand-new palletizing shaft furnace of exploitation, can produce the new technology life of acidic oxidation pelletizing process from giving shaft furnace process in fact.
Summary of the invention the present inventor is absorbed in the comprehensive utilization that shaft furnace is produced pellet technological development and energy technology, be engaged in shaft furnace for many years and produce the engineering design and the specific equipment research and development of acidic oxidation pelletizing, find that according to investigation existing shaft furnace pellet formation technology remains at bigger room for promotion in the utilization of energy medium to present all kinds of shaft furnaces.For this reason, physical reaction and thermal process that the present inventor produces pelletizing to shaft furnace process have carried out detailed, deep research, developed can the vertical furnace of good recovery pelletizing sensible heat in the heat energy master mode, and use this method and research and develop out a kind of efficient full self-support internal combustion type palletizing shaft furnace, the utilization ratio of fuel is greatly enhanced, and outer cooling of the stove of having cancelled pelletizing or perpendicular cooler technology, have good environment protecting.
Produce the problem that exists in the pellet for solving above-mentioned Classical Shaft Furnace, the objective of the invention is to be cooled to below 150 ℃ in the inner direct finished pellet temperature of shaft furnace with discharge, and the high-temperature gas that obtains introduced the shaft furnace internal combustion chamber fully, under the condition of replenishing less heat, can finish oxidation, the roasting process of pelletizing effectively.
The technical scheme that realizes purpose of the present invention is such:
Heat energy control method in a kind of vertical furnace, described shaft furnace comprises petticoat pipe, apparatus for distributing, oven dry bed, combustion chamber, cold air duct, discaling roll discharge apparatus, discharge system, wherein said combustion chamber is set at shaft furnace inside center position, between combustion chamber and shaft furnace body of wall, be provided with air-guiding aisle, be provided with the wind-guiding adjustable valve in the air-guiding aisle, oven dry bed side space down also is provided with cold air mixing device, it is characterized in that this method may further comprise the steps:
(1) according to the requirement of the pellet output and the heat exchange equilibrium conditions of shaft furnace, the flow that control enters the cooling air Q1 of shaft furnace bottom blast inlet cools off the high temperature hot-bulb in the stove, makes the temperature of the finished ball that shaft furnace discharges be lower than the cooling target value;
(2) compile the high-temperature gas that furnace high-temperature hot-bulb cooling heat transferring is obtained, to wherein a part ofly introduce in the shaft furnace combustion chamber, add fuel Qb burning heating, the Q2 temperature is risen to 1150 ℃～1350 ℃ as combustion air Q2, become pelletizing preheating, roasting wind, use Q2 ' expression; Another partly superfluous high-temperature gas Q3 then enters shaft furnace oven dry bed via the air-guiding aisle between two relative sides, combustion chamber and shaft furnace body of wall, and the flow of Q3 is regulated by the wind-guiding adjustable valve in the air-guiding aisle;
(3) the up back of waste gas Q4 after the green-ball roasting of the roasting wind Q2 ' in the above-mentioned steps after to oven dry imports in the shaft furnace oven dry bed, and the pelletizing on the oven dry bed is dried;
(4) replenish an amount of freezing air Qc by cold air mixing device below the oven dry bed, balance oven dry bed is the temperature of mixed gas 2Q3+2Q4 down, makes it to be controlled in 400 ℃～550 ℃ scopes;
(5) above-mentioned all gas compiles a dust-laden exhaust gas Q5 who forms by oven dry bed back and enters in the atmosphere after udst separation is handled.
The requirement of above-mentioned heat exchange equilibrium conditions is meant: the finished product hot-bulb reaches when cooling off target value and the heat exchange balance of air in (1) stove; The heat exchange balance of (2) green-ball preheating, roasting; (3) green-ball exsiccant heat exchange balance.
The above-mentioned temperature that makes the finished ball that shaft furnace discharges is lower than the cooling target value and is meant that the finished product hot-bulb temperature of coming out of the stove is lower than 150 ℃.
The temperature of the dust-laden exhaust gas Q5 that shaft furnace is discharged is controlled in 120 ℃～150 ℃ scopes.
Heat calculation and physical reaction theory according to the hot stove of shaft furnace, must detect the air-flow in each passage of shaft furnace inside and effectively control, to satisfy the requirement of shaft furnace acid pellet production technique, the flow of the high-temperature gas Q3 in the above-mentioned air-guiding aisle can be calculated by following formula:
Q3＝α(ΔP/K)
1/2
α-coefficient relevant wherein with area, the gas temperature of air-guiding aisle
K-air-guiding aisle total drag coefficients
The pressure difference of gas before and after the Δ P-air-guiding aisle, Δ P=P2-P3,
Bottom, P2-combustion chamber collection chamber furnace gas pressure
P3-oven dry bed is gaseous tension down
P2, P3 can be regulated by the wind-guiding adjustable valve in the air-guiding aisle.
The flow of combustion air Q2 then should conform to the gas volume of production technique requirement by firing section, and its calculation formula is:
Q2＝Q1-2×Q3
The addition of fuel Qb is that the requirement of the temperature T 2 ' of preheating, roasting gas Q2 ' according to top, combustion chamber firing section is determined in the described shaft furnace combustion chamber.
The magnitude of recruitment of the cold wind Qc of described oven dry bed below is to determine according to temperature and the flow thereof of the mixed gas 2Q3+2Q4 under the oven dry bed.
According to heat energy control method theory in the above-mentioned vertical furnace, the present inventor has has further designed and developed the internal combustion type palletizing shaft furnace of realizing this method, it comprises petticoat pipe, apparatus for distributing, the oven dry bed, the combustion chamber, cold air duct, the discaling roll discharge apparatus, discharge system etc., it is characterized in that: described combustion chamber is set at the central position of shaft furnace inner horizontal direction and directly is located on the shaft furnace bracing frame of shaft furnace body of heater bottom, between combustion chamber and shaft furnace body of wall, be provided with air-guiding aisle, be provided with the wind-guiding adjustable valve in the air-guiding aisle, oven dry bed side space down also is provided with cold air mixing device.
Described air-guiding aisle is between two relative sides, combustion chamber and shaft furnace body of wall.
Described cold air mixing device is to mend cold pipeline, and this is mended cold pipeline and is set between top of combustion chamber and the oven dry bed in the formed space.
Described wind-guiding adjustable valve is high temperature resistant variable valve.
Heat energy control method and palletizing shaft furnace are based upon on the unified understanding basis to cooling air, combustion air, roasting wind and dry wind in the vertical furnace of the present invention, the heat balance principle of utilization science, design the heat energy control method of " unification of four wind ", all gases is communicated with each other, balance coordination, by correct processing and control variable relation wherein, use special adjusting valve plate that the air output in the passage, combustion gases and discharge amount of exhaust gas are adjusted to optimum regime, production is steadily carried out, made shaft furnace realize energy-efficient pattern truly.The Design Mode of this multifactor heat energy control method is not only applicable to shaft furnace production, may extend to all types of industries stove simultaneously, is expected to become an example of China's industrial furnace energy utilization.
The energy recovery control method of " unification of four wind " and the palletizing shaft furnace of implementing this method are from shaft furnace bottom cooling air air intake in the vertical furnace of the present invention, through cooling to high temperature finished pellet (temperature reaches 1150 degrees centigrade), carry out heat exchange with the high temperature finished pellet, the outflow temperature of finished pellet is dropped to below 150 degrees centigrade, and cooling air temperature in uphill process progressively raises, become the high-temperature hot-air about 1000 degrees centigrade, a high-temperature hot-air part is sent to the top drying bed through air-guiding aisle, carries out drying, intensification to going into the stove green-ball; Another part directly enters the combustion chamber as combustion air, further is heated as roasting wind after fuel combustion.Roasting wind carries out preheating and baking to pellet in the stove, and up waste gas leads to the oven dry bed of upper of furnace body, becomes dry-heat air.Higher because of the gas temperature that collects in oven dry bed below, should allocate an amount of cold wind into, the dry gas temperature is controlled in 400 ℃～550 ℃ scopes.This heat balance system makes the energy obtain the utilization of fullest, and under normal operation, the shaft furnace combustion chamber only need replenish small amount of fuel just can satisfy the production needs, even if also mean the roasting gas that adopts low-calorie fuel also can obtain comparatively high temps simultaneously.
In shaft furnace was produced, as raw material, because of needing that higher maturing temperature and oxygen partial pressure value are arranged in the stove, maturing temperature needed 1200 degrees centigrade to 1350 degrees centigrade approximately as if the rhombohedral iron ore that adopts higher proportion, and Classical Shaft Furnace is difficult to reach.The heat energy control method can make shaft furnace easily realize this temperature requirement in the vertical furnace of the present invention and use, and the oxygen level of roasting gas also can be met, and this advantage is that shaft furnace is used at high proportion rhombohedral iron ore and produced pelletizing and established basic processing condition.
Equally, in the high altitude localities, be stymied by because of high altitude anoxia and the smart powder of iron ice period freeze to make to produce, the heat energy control method makes the high altitude localities utilize shaft furnace process production pellet to become possibility equally vertical furnace of the present invention in and use.This iron ore enterprise for the high altitude localities of lot of domestic and foreign produces the acidic oxidation pellet voluntarily and has brought Gospel.
To be method of the present invention and traditional method handle and there is in essence difference in control for this understanding of cooling air, combustion air, roasting wind, dry wind for the control method of heat energy control method and Classical Shaft Furnace different on the recovery of heat effect in the vertical furnace of the present invention, its basic reason.Traditional method is treated it isolatedly, is handled and control, but is difficult to avoid four influence each other and can not get the ideal effect in actual use again, and this is that process structure form by Classical Shaft Furnace causes and unavoidable.
Unified understanding and handle this relation of cooling air, combustion air, roasting wind and dry wind, be the most key characteristics of the present invention, the present invention organically combines this relation together, the various characteristics of gas stream in the stove properly and have neatly been considered, correctly handle, control well wherein variable relation, make shaft furnace both satisfy the interior cooling requirement of stove at work, make the air after heat exchange is reclaimed reasonably to be used for combustion air and roasting wind and dry wind respectively again finished pellet.
Based on rational process structure design, the present invention can reduce to outflow temperature in the finished pellet stove≤and 150 ℃ (in theory even can be lower), combustion air rises to 900～1000 ℃ (in theory even can be higher), near general required 1050～1150 ℃ technological temperature requirement of acid pellet roasting wind, it is combustion-supporting only need to replenish small amount of fuel in the combustion chamber.Under very high combustion air temperature and a spot of reasonable fuel feed situation, the combustion space of shaft furnace actual needs than before under the traditional method space of shaft furnace combustion chamber dwindle greatly, therefore the bulk of shaft furnace of the present invention combustion chamber increases few than the air-guiding wall bulk of Classical Shaft Furnace.
The shaft furnace overwhelming majority of iron and steel enterprise is all used the fuel of blast furnace gas as shaft furnace at present, but this reason affects the performance performance of shaft furnace always.Because shaft furnace is at roasting higher proportion rhombohedral iron ore (Fe
2O
3) time calcination atmosphere that requires that higher maturing temperature is arranged in the stove and higher oxygen partial pressure is arranged.Adopt shaft furnace of the present invention now, even use blast furnace gas to act as a fuel, higher maturing temperature (1200～1350 ℃) and higher roasting oxygen content gas can both reach easily.
Combustion air in the vertical furnace of the present invention inner combustion chamber is exactly to rise to the pyritous cooling air after reclaiming furnace high-temperature finished ball nodulizing heat fully, so shaft furnace there is no need to be provided with independent high pressure burner blower, only needs a high pressure cooling blower to get final product.
Adopt the present invention, if the discaling roll discharge apparatus is arranged in the top slightly of shaft furnace lower end cooling air blast inlet, finished pellet adds the up cooling effect of cooling air in the temperature at this position≤150 ℃, and the discaling roll actual work temperature is very low.Therefore, both can suitably reduce material requirement, the also corresponding work-ing life that prolongs the discaling roll working zone to the discaling roll working zone.
The internal combustion type palletizing shaft furnace of the present invention that manufactures and designs based on heat energy control method in the vertical furnace of the invention described above, cast off Classical Shaft Furnace once and for all and adopted the processing set-up thinking of external placed type combustion chamber, the combustion chamber is arranged in the central position of shaft furnace inner horizontal direction dexterously and directly is located on the steel construction body of heater bracing frame of body of heater body bottom, this critical change has brought revolutionary effect to shaft furnace, is embodied in the following aspects:
(1) external structural characteristics of full free-standing
The cancellation of external combustion chamber is had ready conditions shaft furnace and is broken away from complexity and towering reinforced concrete frame structure factory building supporting way, and rely on homeostatic body of heater external structure directly to be located on the ground, form independent succinct space image, make shaft furnace of the present invention have the external structural characteristics of full free-standing.Necessary maintenance, service platform all are arranged on each corresponding absolute altitude position of body of heater outer steel structure, and connect as one with furnace binding.Be provided with the connection steel ladder between each platform, all work is all externally finished on the platform.The structure formation of this full self-support not only can reduce the construction investment of shaft furnace project significantly, has also made things convenient for the installation and the maintenance of shaft furnace, has shortened the construction period that shaft furnace is built greatly.According to the difference of shaft furnace built-in combustion chamber section process structure shape, shaft furnace profile of the present invention can have rectangle and circular or other multiple structure formation again.
(2) built-in central burner cell structure
1. the combustion chamber is directly built the mid-way of lower body structure in stove by laying bricks or stones, its scantlings of the structure is wide than the air-guiding wall of Classical Shaft Furnace, be furnished with combustion air and dry wind passage on the body of wall of combustion chamber simultaneously, make central combustion chamber not only have both the function of original air-guiding wall, and the water beams frame mode in the Classical Shaft Furnace is cancelled.The wall body structure of the combustion chamber air-guiding wall body of wall that do not existed shaft furnace in the past to cause the problem of collapsing like this owing to the water beams temperature distortion, the heating wall body structure is highly stable, and the obstacle that shaft furnace maximizes is got rid of substantially.
2. the special and succinct high temperature combustion air air intake mode of built-in central combustion chamber has structurally also overcome Classical Shaft Furnace owing to the complicacy that process structure that high temperature combustion air (800～1000 ℃) pipeline brings is arranged need be set.Though the air-guiding wall of built-in central combustion chamber of shaft furnace of the present invention and Classical Shaft Furnace has the difference of essence, the similar dual function that makes it in fact still can play wind-guiding and eliminate center in the stove " dead stock column " of internal process locations of structures.
3. in the pellet formation process, the dry oven dry bed of green-ball needs dry-heat air, shaft furnace of the present invention is by being provided with the wind-guiding path separately between central combustion chamber and shaft furnace body of wall, itself and the outside body of wall of body of heater are combined together, and set up resistant to elevated temperatures adjusting valve plate in the wind-guiding path, thereby the high temperature wind-guiding amount that makes shaft furnace in the past be difficult to realize is regulated a difficult problem and is solved.
4. shaft furnace of the present invention has increased cold wind blending process system simultaneously again, promptly between central combustion chamber top and oven dry bed, form to be provided with in the space and mend cold pipeline, both controlled the oven dry gas flow temperature of green-ball oven dry bed surface, prevent the too much explosion of green-ball, owing to the increasing of drying airshed has generally improved drying effect, therefore the green-ball drying effect on the green-ball of the shaft furnace of the present invention oven dry bed will obviously be better than the shaft furnace of traditional form again.In addition, the oven dry bed real area on shaft furnace top is obviously increased than Classical Shaft Furnace oven dry bed surface is long-pending, further improved the green-ball drying effect, for Classical Shaft Furnace, the green-ball drying bed bottleneck problem that influences shaft furnace output and utilization coefficient will obtain very big improvement.
5. shaft furnace of the present invention has been owing to cancelled two this Classical Shaft Furnace structures in external combustion chamber, overcome external combustion chamber of former Classical Shaft Furnace and the easy thermal distortion in shaft furnace body junction and damages, and burns with anger, burns red or burnout phenomenon thereby cause.
(3) energy recovery and splendid combustion efficacy efficiently
Because the built-in central burner cell structure of shaft furnace of the present invention, bring ideal energy recovery and combustion efficacy to shaft furnace, to the use of low calorie fuels, reduce fuel consumption and use rhombohedral iron ore production at high proportion and created very advantageous conditions, direct effect may be embodied in following several aspect:
1. the structure formation of built-in central combustion chamber, the heat of fully directly recycling finished pellet in the stove that any shaft furnace can't be accomplished before making becomes possibility, the heat of high temperature that reclaims can be used for the warm-up combustion-supporting air that circulates, save simultaneously the outer complicated finished pellet cooling system of stove again, simplified the cooling air and the combustion air of palletizing shaft furnace and supplied with regulation system.
High temperature finished pellet after shaft furnace of the present invention will be finished through roasting oxidation is as carrier regenerator, high temperature finished pellet (1150～1250 ℃) is sent into the shaft furnace bottom in descending process and up cooling air is reduced to through the heat exchange of enough time≤and 150 ℃, up cooling air can be heated to 900～1000 ℃ by the high temperature finished pellet, and this effect is accomplished in shaft furnace of the present invention.By simple heat calculation, as long as enough cooling air quantities and suitable heat exchange bed depth are arranged, new shaft type furnace can be accomplished this point fully.
2. under very high combustion air temperature and a spot of reasonable fuel feed situation, the combustion space of the shaft furnace actual needs space of Classical Shaft Furnace external placed type combustion chamber than before dwindles greatly.Therefore the bulk of the built-in central combustion chamber of shaft furnace of the present invention increases few than the air-guiding wall bulk of Classical Shaft Furnace.Classical Shaft Furnace enters at external placed type combustion chamber quirk between the roasting wind bocca of shaft furnace both sides need be provided with the airflow uniform distribution passage respectively, and shaft furnace of the present invention is under same effectively roasting area situation, its body of heater profile lateral dimension is little, this tangible advantage is transform shaft furnace of the present invention as for later Classical Shaft Furnace and has created fabulous locus condition, and retrofit work can be finished on the basis that does not influence original mill construction.
3. the rational firing system technological design because shaft furnace of the present invention is superior, the roasting wind-warm syndrome degree that obtains after the in addition a spot of postcombustion burning of high temperature combustion air has been enough to satisfy the needs of acid pellet maturing temperature, and the combustion exhaust that produces in the Classical Shaft Furnace combustion chamber before will being much higher than of the oxygen level of roasting wind, this will significantly help the sinter process condition of acid pellet.Adopt low calorie fuels also can obtain the roasting general mood body of comparatively high temps even if this means shaft furnace of the present invention, can guarantee that also roasting general mood body has higher oxygen level, this point is difficult accomplishing when Classical Shaft Furnace adopts low combustion value furnace gas to act as a fuel.
Because built-in central combustion chamber is an essentially independent refractory masonry, worst hot case and the constructional feature under comparatively high temps have been considered in design, built-in central combustion chamber can be operated under 1400 ℃ the high temperature, and this advantage is that shaft furnace of the present invention will be used at high proportion rhombohedral iron ore from now on and be produced pellet and established basic processing condition.
4. because shaft furnace of the present invention has been cancelled the requisite air-guiding wall water beams of shaft furnace frame mode in the past in the internal process structure, not only obviously reduced the main consumption of shaft furnace body water coolant, also obviously reduce the calorific loss in the stove, improved the utilization efficiency of heat energy of shaft furnace.
5. shaft furnace of the present invention, because it is the energy recovery mode efficiently, the finished pellet temperature of discharging is very low, can fully phase out the higher finished ball nodulizing cooling system of exogenous investment (as straight-line cooler etc.), further obviously reduces the construction investment of shaft furnace pellet formation system.
(4) obvious superior technological operation performance
Shaft furnace of the present invention is because the design of its unique process structure, to the convenient performance of its technological operation aborning and technology controlling and process effect than before Classical Shaft Furnace want much superior, mainly be reflected in:
1. the dry gas under the green-ball oven dry bed surface is because the Comprehensive Control after shaft furnace of the present invention distinctive high temperature wind-guiding adjustable valve and blending cold blast rate have been arranged, all Classical Shaft Furnace is much better than before for green-ball drying effect and speed, main favorable factor is provided for the direct motion operation of shaft furnace.
2. the air quantity ratio inside and outside the big-wall of combustion chamber is selected stock column height outside the suitable wall of combustion chamber blast inlet between air outlet owing to the short circuit effect to blast in stove of built-in central combustion chamber as long as calculate in structure design.And because interior good roasting oxidation atmosphere and the temperature control device of vertical furnace of the present invention, technology soaking zone height can only mainly work to regulate air quantity ratio outside the wall in shaft furnace of the present invention.
3. because bags volume dwindles greatly, replenish the intensification quantity combusted again seldom, so the control of maturing temperature and response speed are all rapid and sensitive than Classical Shaft Furnace, fine condition are provided for maturing temperature and atmospheric condition in the accurate control shaft furnace.
4. the exterior cooling air quantity of shaft furnace is regulated and is depended primarily on the temperature and the real-time output of shaft furnace of discharging the finished ball nodulizing, and roasting wind-warm syndrome degree is mainly by the decision of control aftercombustion intensity.Oven dry bed dry wind temperature and flow velocity are by control high temperature wind-guiding amount and the decision of cold wind blending amount, and each technology controlling and process target and means are all simple and clear, almost are monofactorial independent regulation, make the operation of shaft furnace become very easily convenient.
(5) other shaft furnace class sinter process had adaptability widely
The distinctive built-in central burner cell structure of shaft furnace of the present invention, it is little to have investment, energy recovery efficient height, the characteristics that control device is flexible and efficient, provide good reference with reference to example for other shaft furnace process sinter process that is similar to production acidic oxidation pelletizing iron ore, the extensive adaptability of its technical scheme is that it can be implemented in other most kind industry shaft furnaces at an easy rate, therefore can think that shaft furnace of the present invention has not been an acidic oxidation pellet production unit notion, and can be broadly the technical scheme of its approval for being fit to use on all types of industries shaft furnace.
Often are stymied by owing to the smart powder frozen problem of iron ice period makes to produce in the mine of high altitude localities or dressing-works, the efficient heat energy way of recycling of shaft furnace of the present invention and succinct reasonably firing system characteristics, making becomes possibility equally utilizing shaft furnace process to produce the acidic oxidation pelletizing and obtain higher output than the high altitude localities, this mainly is to have benefited from shaft furnace of the present invention still can obtain the calcination atmosphere and the higher roasting gas temperature of high oxygen content in the high altitude localities factor, and these characteristics will be produced the acidic oxidation pellet voluntarily and be brought glad tidings for the iron mine of domestic and international many high altitude localitiess.
In addition, consider the environmental protection factor during burner design of shaft furnace employing of the present invention, adopted sophisticated high-temperature and low-oxygen combustion technology (HTAC) to burn and chewed design, so combustion processes has effectively suppressed NO
XGeneration, add that the fuel consumption of shaft furnace of the present invention own is a lot of less than Classical Shaft Furnace, so environment protecting also obviously is better than Classical Shaft Furnace and other class shaft furnace.
In sum, full self-support internal combustion type palletizing shaft furnace of the present invention has solved the key obstacle that Classical Shaft Furnace is run into (as the restriction of air-guiding wall water beams scantlings of the structure, the Structure Designing Problem that discaling roll discharge machine causes owing to the body of heater thermal distortion etc.) substantially in large scale development, stepped a crucial step on shaft furnace large scale development road, annual production will can be changed into reality greater than 1,000,000 tons acidic oxidation palletizing shaft furnace by the present invention.
Description of drawings Fig. 1 is a gas schematic flow sheet in the vertical furnace of the present invention;
Fig. 2 is the side schematic view of internal combustion type palletizing shaft furnace internal structure of the present invention;
Fig. 3 is the front schematic view of internal combustion type palletizing shaft furnace internal structure of the present invention;
Fig. 4 is the inner air channel of an internal combustion type palletizing shaft furnace of the present invention synoptic diagram.
Embodiment is for ease of understanding the present invention, and the present invention is described in further detail below in conjunction with accompanying drawing and case study on implementation:
See also Fig. 1, shown in be gas schematic flow sheet in the vertical furnace of the present invention.Shaft furnace of the present invention has been realized cooling air, dry wind, combustion air, the heat reclaiming system of roasting wind " unification of four wind ", from shaft furnace bottom blast inlet cooling air Q1 air intake, through cooling to high temperature finished pellet (temperature reaches 1150 ℃), carry out heat exchange with the high temperature finished pellet, the outflow temperature of finished pellet is dropped to below 150 ℃, and cooling air Q1 temperature in uphill process progressively raises, become the high-temperature hot-air about 1000 ℃, to wherein a part ofly introduce in the shaft furnace combustion chamber as combustion air Q2, add fuel Qb burning heating, the Q2 temperature is risen to 1150 ℃～1350 ℃, become the pelletizing preheating, roasting wind Q2 ', another partly superfluous high-temperature gas Q3 then enters shaft furnace oven dry bed via the air-guiding aisle between combustion chamber and shaft furnace body of wall, the flow of Q3 is regulated by the wind-guiding adjustable valve in the air-guiding aisle, the waste gas Q4 that roasting wind Q2 ' produces the green-ball roasting after drying imports in the shaft furnace oven dry bed, and the pelletizing of drying on the bed is dried.Replenish an amount of freezing air Qc by the cold pipeline of benefit below the oven dry bed, dry the bed temperature of mixed gas 2Q3+2Q4 down, and it is controlled at 400 ℃～550 ℃ scopes with balance.All gas compiles the dust-laden exhaust gas Q5 that forms by oven dry bed back and enters in the atmosphere after the dust removal installation purifying treatment.
Fig. 2 to Fig. 4 is according to the internal combustion type palletizing shaft furnace example structure of heat energy control method Design Theory in the vertical furnace of the present invention and inner air channel synoptic diagram.
See also Fig. 2, Fig. 3, shown in be respectively side and the Facad structure signal of shaft furnace of the present invention when being shaped as rectangle, the combustion chamber 6 of shaft furnace is positioned at the central position of shaft furnace inner horizontal direction, and directly builds by laying bricks or stones on the steel construction bracing frame 17 of shaft furnace, becomes built-in central combustion chamber.Gas pipeline 9 is introduced combustion chamber 6 with geseous fuel, 6 two relative sides 15 and 16 of shaft furnace bodies of wall respectively have an air-guiding aisle 7 in the combustion chamber, be used for the importing of dry wind, be provided with a resistant to elevated temperatures wind-guiding adjustable valve 8 in every air-guiding aisle 7, mend cold pipeline 4 and be positioned at the top of combustion chamber 6 and dry bed formed space, 3 belows, extraneous cold wind is mended cold pipeline 4 by this and is fed in the space of 6 tops, combustion chamber and oven dry 3 below.The top of mending cold pipeline 4 is oven dry beds 3, add in the stove by apparatus for distributing 2 through the green-ball that pelletizer is made, on oven dry bed 3, finish oven dry, heat up and enter shaft furnace preheating and baking section 14 along guide bed 5, the high-temperature gas that is produced by combustion chamber 6 burning enters shaft furnace pellet in the stove is carried out preheating, roasting, oxidation, through after the roasting, oxidation and descending finished ball nodulizing by after being arranged in cold air duct 10 blast inlets the discaling roll discharge apparatus 11 of top carrying out discharge, loose metal slightly, discharge shaft furnaces via discharge system 12.The topmost of shaft furnace is provided with petticoat pipe 1, and the outlet of petticoat pipe 1 is connected to dust separation device.
See also Fig. 4 again, shown in be shaft furnace schematic internal view of the present invention.From shaft furnace bottom blast inlet 18 cooling air Q1 air intakes, through cooling to high temperature finished pellet (temperature reach～1150 ℃), carry out heat exchange with the high temperature finished pellet, the outflow temperature of finished pellet is dropped to below 150 ℃, and cooling air Q1 temperature in uphill process progressively raises, become the high-temperature hot-air about 1000 ℃, to wherein a part ofly introduce in the shaft furnace combustion chamber 6 as combustion air Q2, add fuel Qb burning heating, the Q2 temperature is risen to 1150 ℃～1350 ℃, become the pelletizing preheating, roasting wind Q2 ', another partly superfluous high-temperature gas Q3 then enters shaft furnace oven dry beds 3 via the air-guiding aisle 7 of 16 of 6 two relative sides, combustion chamber and shaft furnace bodies of wall, the flow of Q3 is regulated by the wind-guiding adjustable valve 8 in the air-guiding aisle 7, up waste gas Q4 imports in the shaft furnace oven dry bed 3 after the green-ball roasting of roasting wind Q2 ' after to oven dry, and the pelletizing on the oven dry bed 3 is dried.Replenish an amount of freezing air Qc by the cold pipeline 4 of the benefit below oven dry bed 3,, and it is controlled at 400 ℃～550 ℃ scopes with the temperature of 3 times mixed gas 2Q3+2Q4 of balance oven dry bed.All gas compiles the dust-laden exhaust gas Q5 that forms by oven dry bed 3 backs and enters in the atmosphere after the dust removal installation purifying treatment.
According to the heat calculation and the physical reaction theory of the hot stove of shaft furnace, must detect the air-flow in each passage of shaft furnace inside and effectively control, to satisfy the requirement of shaft furnace acid pellet production technique.For making computation process distinct, ignore some secondary causes, its main calculation procedure can be expressed as follows:
(1) go into the flow Qp (kg/h) of stove butt green-ball and the temperature requirement that finished ball goes out ball according to shaft furnace, can calculate the flow of required cooling air Q1 by following formula:
Q1×ΔTair×Cair＝Qp×ΔTp
c×Cp
Wherein: the temperature head [K] before and after the heat exchange of Δ Tair-air
Δ Tp
cTemperature head [K] before and after the cooling of-pelletizing
Cair-air mean heat capacity [kJ/ (kg.K)]
Cp-pelletizing mean heat capacity [kJ/ (kg.K)]
Therefore:
Q1＝Qb×ΔTp
c×Cp/(ΔTair×Cair)(kg/h)
(2) after Q1 enters 6 bottoms, shaft furnace combustion chamber, to be divided into two portions, a part 2 * Q3 directly enters oven dry bed 3 bottoms by bypass air-guiding aisle 7, and another part enters 6 middle and upper parts, combustion chamber as combustion air Q2, generates pyritous roasting, preheating gas Q2 ' after fuel Qb burning heating.
In said process, the value of Q2 ' be according to pelletizing during by firing section 14 required physics equivalent heat Gb and magnetite oxidation reaction heat G0 calculate.Specifically be calculated as follows:
Gb＝ΔT′p×Cp×Qp
Wherein: the Gb-pelletizing is by the physics equivalent heat [kg/h] of the required absorption of firing section
Δ T ' p-pelletizing is by firing section temperature head [K]
Cp-pelletizing mean heat capacity [kJ/ (kg.K)]
Qp-is by the pelletizing flow [kg/h] of firing section
The oxidizing reaction thermal discharge of pelletizing when roasting oxidation:
G0=Q
Oxidation(n
Feo/ 0.31) (TFe/0.724)
Iron protoxide oxidizing reaction heat release [kJ/h] in the G0-pelletizing
Q
Oxidation-magnetite (Fe
3O
4) oxidation heat liberation [0.644 * 10
3KJ/kg]
n
FeoThe percentage composition of Feo in the-iron ore concentrate
The percentage composition of full iron in the TFe-iron ore concentrate
The heat Gg of insufficient section should be replenished (the gas weightlessness that the oxygen-consumption of Feo causes in because of pelletizing is very little, can not calculate so gas weight reduces) by Q2 ' in preheating and baking section 14
Gg＝Gb-G0
Because of Gg=Q2 ' * Δ Tg * Cg
Q2’＝Gg/(ΔTg×Cg)(kg/h)
Wherein: the cooling [K] of Δ Tg-roasting gas
The mean heat capacity of Cg-roasting gas [kJ/ (kg.K)]
Therefore, the target temperature T2 ' of the calorific value Hb of based on fuel, roasting gas can obtain demand for fuel amount Qb and combustion-supporting gas demand Q2
Q2’＝Q2+Qb
Qb×Hb＝Q2’×ΔT2’×C2’-Q2×ΔT2×C2
Wherein: the temperature difference of Δ T2 '-products of combustion (T2 '-20) [K] (Q2 ' temperature)
The mean heat capacity of C2 '-products of combustion [kJ/ (kg.K)]
The temperature difference (T2-20) [K] of Δ T2-high temperature combustion air
The mean heat capacity of C2-high temperature combustion air [kJ/ (kg.K)]
Therefore for different fuel, the demand Q2 of combustion air has nothing in common with each other.On the basis that has obtained the Q2 target call, we just can come indirect control combustion air Q2 by the adjusting to bypass wind Q3 in the air-guiding aisle 7:
Q2＝Q1-2×Q3
Q3＝α(ΔP/K)
1/2
Wherein: the α-coefficient relevant with area, the gas temperature of air-guiding aisle 7
K-air-guiding aisle 7 total drag coefficients
The front and back pressure difference of Δ P-air-guiding aisle 7
(3) all gas that is entered from the shaft furnace bottom by shaft furnace finally all collects in oven dry bed 3 bottoms, should it is also noted that Q3 directly enters oven dry bed 3 from 6 bottoms, shaft furnace combustion chamber, its temperature very high (being about 900 ℃～1000 ℃), oven dry has very big influence to green-ball.In order to reduce the explosion of green-ball in high-temperature gas, cool off so should below oven dry bed 3, sneak into cooling air Qc, the state (temperature of Q4 and its target temperature are approaching, do not participate in calculating) of 400 ℃～550 ℃ of temperature controls.
Qc＝2×Q3×ΔT3×C3/(ΔTc×Cc)(kg/h)
Wherein: bypass gases enters the cooling [K] behind the oven dry bed 3 in the Δ T3-air-guiding aisle 7
The thermal capacitance of bypass gases in the C3-air-guiding aisle 7 [kJ/ (kg.K)]
Δ Tc-blending cold wind temperature rise [K]
The thermal capacitance of Cc-blending cold wind [kJ/ (kg.K)]
Claims (11)
1. heat energy control method in the vertical furnace, described shaft furnace comprises petticoat pipe (1), apparatus for distributing (2), oven dry bed (3), combustion chamber (6), cold air duct (10), discaling roll discharge apparatus (11), discharge system (12), wherein said combustion chamber (6) is set at shaft furnace inside center position, between combustion chamber (6) and shaft furnace body of wall (16), be provided with air-guiding aisle (7), be provided with wind-guiding adjustable valve (8) in the air-guiding aisle (7), oven dry bed (3) side space down also is provided with cold air mixing device, it is characterized in that this method may further comprise the steps:
(1) according to the requirement of the pellet output and the heat exchange equilibrium conditions of shaft furnace, the flow that control enters the cooling air Q1 of shaft furnace bottom blast inlet (18) cools off the high temperature hot-bulb in the stove, makes the temperature of the finished ball that shaft furnace discharges be lower than the cooling target value;
(2) compile the high-temperature gas that furnace high-temperature hot-bulb cooling heat transferring is obtained, to wherein a part ofly introduce in the shaft furnace combustion chamber (6), add fuel Qb burning heating, the Q2 temperature is risen to 1150 ℃～1350 ℃ as combustion air Q2, become pelletizing preheating, roasting wind, use Q2 ' expression; Another partly superfluous high-temperature gas Q3 then enters shaft furnace oven dry bed (3) via the air-guiding aisle (7) between (6) two relative sides, combustion chamber and shaft furnace body of wall (16), and the flow of Q3 is regulated by the wind-guiding adjustable valve (8) in the air-guiding aisle (7);
(3) in the up remittance shaft furnace of the waste gas Q4 oven dry bed (3) after the green-ball roasting of the roasting wind Q2 ' in the above-mentioned steps (2) after, the pelletizing on the oven dry bed (3) is dried oven dry;
(4) replenish an amount of freezing air Qc in oven dry bed (3) below by cold air mixing device, balance oven dry bed (3) is the temperature of mixed gas 2Q3+2Q4 down, makes it to be controlled in 400 ℃～550 ℃ scopes;
(5) above-mentioned all gas compiles a dust-laden exhaust gas Q5 who forms by oven dry bed (3) back and enters in the atmosphere after udst separation is handled.
2. heat energy control method in the vertical furnace according to claim 1, it is characterized in that: the requirement of described heat exchange equilibrium conditions is meant: the finished product hot-bulb reaches when cooling off target value and the heat exchange balance of air in (1) stove; The heat exchange balance of (2) green-ball preheating, roasting; (3) green-ball exsiccant heat exchange balance.
3. heat energy control method in the vertical furnace according to claim 1, it is characterized in that: described cooling target value is meant that the finished product hot-bulb temperature of coming out of the stove is lower than 150 ℃.
4. heat energy control method in the vertical furnace according to claim 1, it is characterized in that: the temperature of described dust-laden exhaust gas Q5 is controlled in 120 ℃～150 ℃ scopes.
5. heat energy control method in the vertical furnace according to claim 1, it is characterized in that: the flow of described combustion air Q2 should conform to the gas volume of production technique requirement by firing section (14), that is:
Q2＝Q1-2×Q3。
6. heat energy control method in the vertical furnace according to claim 1 is characterized in that: the addition of interior the fuel Qb in described shaft furnace combustion chamber (6) is that the requirement of temperature T 2 ' of preheating, roasting gas Q2 ' according to combustion chamber (6) top firing section (14) is definite.
7. heat energy control method in the vertical furnace according to claim 1 is characterized in that: the magnitude of recruitment of the cold wind Qc of described oven dry bed (3) below is to determine according to mixed gas 2Q3+2Q4 temperature under the oven dry bed (3) and flow thereof.
8. internal combustion type palletizing shaft furnace of realizing heat energy control method in the described vertical furnace of claim 1, comprise petticoat pipe (1), apparatus for distributing (2), oven dry bed (3), combustion chamber (6), cold air duct (10), discaling roll discharge apparatus (11), discharge system (12), it is characterized in that: described combustion chamber (6) are set at the central position of shaft furnace inner horizontal direction and directly are located on the shaft furnace bracing frame (17) of shaft furnace body of heater bottom, between combustion chamber (6) and shaft furnace body of wall (16), be provided with air-guiding aisle (7), be provided with wind-guiding adjustable valve (8) in the air-guiding aisle (7), oven dry bed (3) side space down also is provided with cold air mixing device.
9. internal combustion type palletizing shaft furnace according to claim 8 is characterized in that: described air-guiding aisle (7) is positioned between (6) two relative sides, combustion chamber (15) and the shaft furnace body of wall (16).
10. internal combustion type palletizing shaft furnace according to claim 8 is characterized in that: described cold air mixing device is to mend cold pipeline (4), and this is mended cold pipeline (4) and is set between (6) top, combustion chamber and the oven dry bed (3) in the formed space.
11. internal combustion type palletizing shaft furnace according to claim 8 is characterized in that: described wind-guiding adjustable valve (8) is high temperature resistant variable valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510038907 CN1279191C (en) | 2005-04-14 | 2005-04-14 | Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510038907 CN1279191C (en) | 2005-04-14 | 2005-04-14 | Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1676631A CN1676631A (en) | 2005-10-05 |
| CN1279191C true CN1279191C (en) | 2006-10-11 |
Family
ID=35049380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510038907 Expired - Fee Related CN1279191C (en) | 2005-04-14 | 2005-04-14 | Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1279191C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589515U (en) * | 2009-11-25 | 2010-09-22 | 杨光 | Roasting reduction shaft furnace |
| CN102586588B (en) * | 2012-03-30 | 2014-05-14 | 彭武星 | Roasting method for refining vanadium pentoxide |
| CN103673582B (en) * | 2013-12-31 | 2016-03-02 | 北京七星华创电子股份有限公司 | The method controlling loading area temperature in boat process falls in vertical furnace equipment |
| CN110484713B (en) * | 2019-09-05 | 2021-02-19 | 首钢集团有限公司 | Method and device for producing pellet ore |
| CN110846456A (en) * | 2019-11-22 | 2020-02-28 | 刘建华 | Iron oxide reduction device and process |
| CN111707698B (en) * | 2020-07-16 | 2021-04-13 | 西安交通大学 | Experimental device and test method for high-temperature calcination reaction characteristics in flow and temperature cooperative alternating heating mode |
| CN113652542B (en) * | 2021-08-16 | 2022-12-06 | 中冶长天国际工程有限责任公司 | Physical simulation test system and test method for roasting of oxidized pellets |
-
2005
- 2005-04-14 CN CN 200510038907 patent/CN1279191C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1676631A (en) | 2005-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1279191C (en) | Shaft furnace internal heat control method and internal-combustion pelletizing shaft furnace realizing same | |
| CN100338236C (en) | Heating furnace with regenerative burners and method of operating heating furnace | |
| CN101857383B (en) | Beam limekiln | |
| CN1777776A (en) | Grate type waste incinerator and method of controlling combustion of same | |
| CN101863627B (en) | Double-beam lime kiln | |
| CN101755903B (en) | Energy-efficient grain dryer | |
| CN203080030U (en) | Ring type roaster | |
| CN102875036A (en) | Heat storage type lime rotary kiln | |
| CN101755904B (en) | Energy-saving grain drying equipment | |
| CN101139093A (en) | Method and device of fluidized carbonization moving bed activating of chemical legal wood activated charcoal | |
| CN1290846A (en) | Method for calcining mine material | |
| CN102010974A (en) | Matching structure of heating furnace and annealing furnace for producing steel balls | |
| CN102241997B (en) | Integrated device for producing carbon continuously and utilizing hot blast by utilizing biomass fuels | |
| CN2802400Y (en) | Vertical internal combustion pelletizing shaft furnace | |
| CN2854475Y (en) | Energy-saving large envenronoment protection type oxidation pelletizing roasting shaft furnace | |
| CN1198779A (en) | Method of manufacturing sintered ore and sintering machine therefor | |
| CN201901689U (en) | Matched structure of heating furnace and tempering furnace for producing steel ball | |
| CN201402036Y (en) | Zhong shi lime shaft kiln | |
| CN102079982A (en) | Production method of formed coke | |
| CN2666909Y (en) | Energy-saving environment protection active lime burning-in shaft kiln | |
| CN203999383U (en) | Low-temperature decomposition and high temperature sintering all-in-one oven | |
| CN1693755A (en) | Heating furnace with regenerative burners and method of operating heating furnace | |
| CN2828694Y (en) | Energy-saving avid oxide pelletizing roasting shaft furnace | |
| CN111777343A (en) | Efficient and environment-friendly tower type mixed combustion light-burning magnesium shaft kiln and production process thereof | |
| CN2652943Y (en) | Energy saving type iron-making pellet roasting vertical furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061011 Termination date: 20120414 |