CN103542725A - Method for prolonging service life of guide chute of sintering machine - Google Patents
Method for prolonging service life of guide chute of sintering machine Download PDFInfo
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- CN103542725A CN103542725A CN201310476382.0A CN201310476382A CN103542725A CN 103542725 A CN103542725 A CN 103542725A CN 201310476382 A CN201310476382 A CN 201310476382A CN 103542725 A CN103542725 A CN 103542725A
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Abstract
The invention discloses a method for prolonging the service life of a guide chute of a sintering machine, and belongs to the field of technologies for sintering metallurgical iron ore powder. The method includes welding an anchoring part on a chute bottom plate of the guide chute of the sintering machine; laying prefabricated bricks on an extending end surface of a discharge end of the chute bottom plate of the guide chute of the sintering machine; performing dry mixing on castables in a stirrer, adding water into the castables, stirring the water and the castables, conveying the castables to an area, which is located within the range of the prefabricated bricks, of the chute bottom plate, casting the castables and fastening the castables by the anchoring part. The method has the advantages that a body, which bears impact of sinter cakes, of the guide chute is made of the high-strength refractory castables instead of metal, and accordingly the impact resistance, the abrasion resistance and the corrosion resistance of the guide chute at a high temperature can be greatly improved.
Description
Technical field
The invention belongs to metallurgy iron sintering mineral powder technical field, particularly a kind of method that improves the gathering sill of sintering device life-span.
Background technology
The operation principle of sintering machine is that iron-bearing material is equipped with flux, fuel etc. through mixing granulation formation compound, by distribution device on sintering machine compound cloth on the chassis of sintering machine, through ignition furnace, light a fire, under exhausting condition, compound carries out sintering from top to bottom, and when sintering pallet runs to the afterbody of sintering machine, compound has become thermal sintering cake, the temperature of material layer lower part sintering deposit cake is mostly between 700-900 ℃, and part red beds temperature even can reach 1100 ℃.
Gathering sill of sintering device is between the afterbody of sintering machine and the feeder of single roll crusher, it is the visual plant on whole sintering process production line, with the sintering deposit cake of red, from eminence, fall and pound deflector chute and cushion, then thermal sintering cake is fed between roller tooth that single roll crusher rotating and grate plate and carries out fragmentation, finally offers central cooler and carries out the cooling of sintering deposit.The effect of tail gathering sill of sintering machine is the powerful impact producing when absorbing sinter cake on chassis and fall.For preventing that sinter cake from directly impacting single roller and producing the destruction to single roller, deflector chute is generally designed to inclined-plane, and requires there is certain length, after the material on sintering pallet gets off, by expecting that the mode of material extrusion feeds single roll crusher material.
Yet because deflector chute is subject to for a long time the impact of thermal sintering cake and washes away under hot conditions, traditional structure of material guiding chute easily produces high temperature corrosion and wear out failure, causes faults frequent in production process.And the integral replacing of deflector chute is more difficult, thus maintenance load and consume material spare part amount very big, had a strong impact on the operating rate of sintering plant.
At present, the project organization of domestic tail gathering sill of sintering machine is almost identical, and whole deflector chute comprises base, cell body, scraper piece, material blocking block and side plate.The impact of sinter cake when deflector chute cell body is mainly subject to sintering pallet blanking, cell body is at long-term high temperature with under impacting, and the steel plate of cell body can produce distortion and wearing and tearing, until damage to be repaired.Typical damageable zone has: the charging and discharging end of deflector chute and cell body connecting bolt.The middle part of tradition deflector chute is provided with material lining, the general steel plate that adopts of material lining is welded into the version that grid adds little square steel, and in use, material lining is constantly subject to the impact of thermal sintering cake to deflector chute, the material lining in service life that does not reach expection toward contact is just smashed, and needs stop production to overhaul.Because material lining cannot be dismantled, be in most cases the cell body of integral replacing deflector chute, both the manufacturing schedule that affects consuming time, had also increased substantially production cost.
The life cycle of existing deflector chute is generally three months, and the time between overhauls(TBO) is about 3 days.Although prior art discloses by using wear-resistant block to adopt rectangular block, between its medial surface and last step, form depression hole, can utilize hole inner filling material to form anti-wear-resisting and shock proof protection piles up, also have by elastic device being installed to deflector chute pedestal, cushioning effect has been played in impact when sinter cake is fallen.But the main body of bearing the impact of sinter cake still be take metal as main, in design, often select potassium steel or high-chromium alloy.The potassium steel antiwear property of being on active service under hot conditions is low, and easily embrittlement; Although high-chromium alloy has good wear resistance, casting technique requires strict, and yield rate is low, and Technology for Heating Processing is complicated, thereby manufacturing cost is high.Moreover, the thermal conductivity factor of metal at 800 ℃ be generally all at 30-40w/mk, so metal base plate is in the process contacting with sinter cake, and heat can conduct to the key members such as cell body connecting bolt very soon, makes it because of metal fever fatigue failure.So the deflector chute in prior art after various improvement is still undesirable service life.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that improves the gathering sill of sintering device life-span, solved the technical problem that sinter cake impacts rapid wear of being heated of deflector chute in prior art.
For solving the problems of the technologies described above, the invention provides a kind of method that improves the gathering sill of sintering device life-span, comprise the steps:
Chute base plate weld anchor firmware at gathering sill of sintering device;
Then at the discharging end of the chute base plate of described gathering sill of sintering device, prolong end face and build preformed bricks by laying bricks or stones;
Castable is dry mixed in agitator, and adds water stirring, then described castable is delivered on the chute base plate within the scope of described preformed bricks and is poured into a mould, described anchoring piece is fastening to described castable.
Further, all weldering is full for the weld seam of the root of described anchoring piece and described chute base plate.
Further, the brickwork joint of described preformed bricks is not more than 2mm.
Further, the anti-folding of described castable and withstand voltage properties are as follows:
When temperature is 110 ℃, the time, its fracture resistance was 19.20MPa after 24h, and its withstand voltage properties is 110.76MPa;
When temperature is 600 ℃, the time, its fracture resistance was 23.15MPa after 3h, and its withstand voltage properties is 119.77MPa;
When temperature is 1000 ℃, the time, its fracture resistance was 25.83MPa after 3h, and its withstand voltage properties is 192.70MPa.
Further, the thermal conductivity factor of described castable at 800 ℃ is 0.9-1w/mk.
Further, the ratio that adds water described in is the 6-7% of total castable weight.
Further, the instrument of described conveying castable is any one in dolly, hopper or pump.
Further, the construction method of described cast is sliding formwork mode or injection method.
Further, during described cast simultaneously to described castable vibration tamping.
Further, during described vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of described castable, and after air pocket glows, described vibrating head is slowly extracted out.
The method in raising gathering sill of sintering device life-span provided by the invention, the main body of deflector chute being born to the impact of sinter cake has become high-intensity castable refractory from metal, greatly strengthened deflector chute shock-resistant, wear-resistant, corrosion resistance at high temperature, castable is not less than the compressive resistance of 110MPa, also can further improve the toughness of castable, strengthen wearability, the inventive method can make deflector chute at high temperature shock-resistant, wear-resistant, corrosion-resistant, and simple in structure, cost is not high, construction, easy to maintenance.
Accompanying drawing explanation
A kind of method step figure that improves the gathering sill of sintering device life-span that Fig. 1 provides for the embodiment of the present invention;
The gathering sill of sintering device structural representation that Fig. 2 provides for the embodiment of the present invention;
Reference numeral:
1, deflector chute, 2, chute base plate, 3, preformed bricks, 4, anchoring hook, 5, castable.
The specific embodiment
Referring to Fig. 1 and Fig. 2, a kind of method that improves the gathering sill of sintering device life-span that the embodiment of the present invention provides, comprises the steps:
Step 101: at the chute base plate 2 weld anchor firmwares 4 of gathering sill of sintering device 1;
Step 102: then prolong end face at the discharging end of the chute base plate of gathering sill of sintering device and build preformed bricks 3 by laying bricks or stones;
Step 103: castable 5 is dry mixed in agitator, and adds water stirring, then castable 5 is delivered on the chute base plate within the scope of preformed bricks and is poured into a mould, 4 pairs of castables 5 of anchoring piece are fastening.
A kind of method that improves the gathering sill of sintering device life-span that the embodiment of the present invention provides, specifically comprises the steps:
Step: 201: draw grid line (according to the requirement of drawing) on the chute base plate of gathering sill of sintering device, at the contact place of grid lines weld anchor firmware, the weld seam of the root of anchoring piece and chute base plate all weldering is full, the effect of anchoring piece is to grasp of castable, be fixed on deflector chute base plate, so in use, can there is not easily the danger of slippage in the resistance to material of castable;
Step 202: for guaranteeing that castable is subject to, under the impact of sintering nugget, slump and convenient construction do not occur, then at the discharging end of the bottom land of gathering sill of sintering device, prolong end face and build preformed bricks by laying bricks or stones, the brickwork joint of preformed bricks is not more than 2mm, in brickwork joint, mud all should be full, jointing is answered on its surface, and the effect of preformed bricks mainly comprises two aspects; The first, because deflector chute base plate is an inclined-plane, and castable is the material with certain fluidity, therefore first in the bottom on inclined-plane, builds row's brick by laying bricks or stones, starts to carry out the construction of castable from brick, and brick is accepted power to castable like this, convenient construction.The second, in use, end face discharging position is damageable zone to deflector chute, if end face well damage, the danger of slump may occur castable above, therefore at end face, lays bricks the overall structure of deflector chute has been played to protective effect.
Step 203: castable is dry mixed to 2-3 minutes in agitator, and add water stirring, and the ratio that adds water is the 6-7% of total castable weight, mixing time is 3-5 minute, then castable is poured into a mould to the chute base plate within the scope of preformed bricks by cart transport, anchoring piece is fastening to castable.In embodiments of the present invention, also can be by carrying in hopper or pump, in embodiments of the present invention, the anti-folding of castable and withstand voltage properties are as follows:
When temperature is 110 ℃, the time, its fracture resistance was 19.20MPa after 24h, and its withstand voltage properties is 110.76MPa;
When temperature is 600 ℃, the time, its fracture resistance was 23.15MPa after 3h, and its withstand voltage properties is 119.77MPa;
When temperature is 1000 ℃, the time, its fracture resistance was 25.83MPa after 3h, and its withstand voltage properties is 192.70MPa;
In embodiments of the present invention, high-intensity castable refractory, greatly strengthened at high temperature shock-resistant of deflector chute, wear-resistant, corrosion resistance, thereby significantly improved the service life of gathering sill of sintering device, saved frequent maintain and replace cost, improved the operating rate of sintering plant, in addition, high-strength castable has the lasting compressive resistance that is not less than 110MPa at 110-1100 ℃, also can further improve the toughness of castable, strengthen wearability, can meet the service condition of the large-type sinterer deflector chutes such as 550m2, and adopt slding form operation method can guarantee speed of application and casting quality.
Wherein, the thermal conductivity factor of castable at 800 ℃ is 0.9-1w/m 〃 k; owing to only having the 2-3% of Thermal Conductivity by Using 30～40w/m 〃 k; greatly slowed down the heat conduction of sintering deposit heat to hardwares such as deflector chute connecting bolts; reduce key position thermal fatigue failure probability, thereby effectively protected the overall structure of deflector chute.
Concrete pouring procedure is:
The time of cast is 30-40 minute, that is to say, the material being stirred must be poured in 30-40 minute;
Wherein, the construction method of cast is sliding formwork mode or injection method, and concrete using method is:
Construction first adopts synovial membrane method, during cast simultaneously to castable vibration tamping, on one side sleiding form rise, until castable reaches the height of design.During vibration, must not on same position, shake for a long time or regenerate, avoid pouring into a mould the bed of material and produce segregation phenomenon.Must not vibrate disorderly in a jumble, during vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of castable, and after air pocket glows, vibrating head is slowly extracted out, avoids causing the cast bed of material and occurring cavity because extracting excessive velocities.Pour mass after casting and constructing completes must not stand outer force-disturbance before solidifying again.
Finally, the deflector chute of having poured into a mould is placed in to maintenance under normal temperature, curing time generally needs 48-72 hour.Before using, according to baking curve, toast and can come into operation.
After deflector chute is used a period of time, if the castable generation local damage on cell body, fall the phenomenons such as material, just need safeguard, can adopt described high-strength castable, in the mode of spraying, spray repair construction is carried out in damage position, need not, deflector chute overall pulling down, greatly save maintenance cost.
The method in the raising gathering sill of sintering device life-span that the embodiment of the present invention provides, the main body of deflector chute being born to the impact of sinter cake has become high-intensity castable refractory from metal, greatly strengthened deflector chute shock-resistant, wear-resistant, corrosion resistance at high temperature, castable is not less than the compressive resistance of 110MPa, also can further improve the toughness of castable, strengthen wearability, the inventive method can make deflector chute at high temperature shock-resistant, wear-resistant, corrosion-resistant, and simple in structure, cost is not high, construction, easy to maintenance.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a method that improves the gathering sill of sintering device life-span, is characterized in that, comprises the steps:
Chute base plate weld anchor firmware at gathering sill of sintering device;
Then at the discharging end of the chute base plate of described gathering sill of sintering device, prolong end face and build preformed bricks by laying bricks or stones;
Castable is dry mixed in agitator, and adds water stirring, then described castable is delivered on the chute base plate within the scope of described preformed bricks and is poured into a mould, described anchoring piece is fastening to described castable.
2. method according to claim 1, is characterized in that, the weld seam of the root of described anchoring piece and described chute base plate all weldering is full.
3. method according to claim 1, is characterized in that, the brickwork joint of described preformed bricks is not more than 2mm.
4. method according to claim 1, is characterized in that, the anti-folding of described castable and withstand voltage properties are as follows:
When temperature is 110 ℃, the time, its fracture resistance was 19.20MPa after 24h, and its withstand voltage properties is 110.76MPa;
When temperature is 600 ℃, the time, its fracture resistance was 23.15MPa after 3h, and its withstand voltage properties is 119.77MPa;
When temperature is 1000 ℃, the time, its fracture resistance was 25.83MPa after 3h, and its withstand voltage properties is 192.70MPa.
5. method according to claim 4, is characterized in that, the thermal conductivity factor of described castable at 800 ℃ is 0.9-1w/mk.
6. method according to claim 1, is characterized in that, described in add water ratio be the 6-7% of total castable weight.
7. method according to claim 1, is characterized in that, the instrument of described conveying castable is any one in dolly, hopper or pump.
8. method according to claim 1, is characterized in that, the construction method of described cast is sliding formwork mode or injection method.
9. method according to claim 8, is characterized in that, during described cast simultaneously to described castable vibration tamping.
10. method according to claim 9, is characterized in that, during described vibration tamping, vibrating head moves evenly by same direction, when slurry is returned on the surface of described castable, and after air pocket glows, described vibrating head is slowly extracted out.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109957650A (en) * | 2019-04-02 | 2019-07-02 | 中天钢铁集团有限公司 | A kind of method and apparatus of segmentation surface layer sintering |
| CN115057694A (en) * | 2022-07-08 | 2022-09-16 | 河南正杰新材料科技有限公司 | Corundum-mullite castable for sintering machine air box and precast block prepared from corundum-mullite castable |
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| CN103542725B (en) | 2015-05-27 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee after: Shougang Jingtang Steel & Iron United Co., Ltd. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Co-patentee before: Shougang Jingtang Steel & Iron United Co., Ltd. Patentee before: Capital Iron & Steel General Company |
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