CN101109024A - Method of on-line thread feeding and furnace protecting of ironmaking blast furnace and thread feeding device thereof - Google Patents
Method of on-line thread feeding and furnace protecting of ironmaking blast furnace and thread feeding device thereof Download PDFInfo
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- CN101109024A CN101109024A CNA2007100125613A CN200710012561A CN101109024A CN 101109024 A CN101109024 A CN 101109024A CN A2007100125613 A CNA2007100125613 A CN A2007100125613A CN 200710012561 A CN200710012561 A CN 200710012561A CN 101109024 A CN101109024 A CN 101109024A
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Abstract
The invention provides a wire-feeding and furnace protection method of blast furnaces and the wire-feeding device. The purpose is to solve the following problems: conventionally, the Ti-containing furnace protection materials are added into the furnace together with the furnace materials through the top of the furnace. The application of Ti-containing powders will have significant impact on the production system of the furnace. At the same time, the Ti-containing materials will decrease the output of the furnace. In addition, the titanium oxide of the Ti-containing materials is uniformly mixed in the entire slag so that the titanium oxide density in the slag is lowered significantly. The key points of the invention are described in the followings: a wire-feeding device is connected with the coal-spraying mouth of the furnace blast blowpipe. The furnace protection material cored wires are sent to the furnace along the cored wire access of the wire-feeding device. The port through which the furnace protection material cored wires flow into the furnace is just the coal-spraying mouth of the furnace blast blowpipe.
Description
Technical field
The present invention relates to a kind of iron-smelting blast furnace carries out on-line maintenance, repairing to the following furnace lining in air port method and device.
Background technology
The life of modern blast furnace, blast furnace hearth and furnace bottom furnace lining damaged, and are the important factors that influences blast furnace campaign up to 15～20 years.Especially, the localized attack or the damage of recurrent aborning blast furnace hearth and furnace bottom furnace lining seriously influence work-ing life of blast furnace.On-line maintenance and repairing cupola well and furnace bottom furnace lining, particularly on-line maintenance and repairing are carried out in the localized attack or the damage of blast furnace hearth and furnace bottom furnace lining, to tangible economic benefit be arranged for the life-span that prolongs blast furnace, the generation great effect of saving energy and reduce the cost, reduce production costs that realizes blast furnace.But still lack effective technological method and utility unit so far.
Conventional furnace retaining method is that titaniferous material is sent into blast furnace in the modern metallurgy, utilizes the carbonitride of crossing reduction generation titanium of titaniferous material in blast furnace to carry out furnace retaining.But titaniferous material is from where, send into blast furnace with which kind of method, is diverse to the effect of furnace retaining and to the influence of blast furnace production.
Conventional titaniferous material furnace retaining is that block titaniferous material is added the blast furnace with blast furnace burden from the blast furnace furnace roof.When using the powdery titaniferous material, need carry out that agglomeration is handled or the agglomeration system that adds the normal raw material of blast furnace carries out agglomeration to the powdery titaniferous material separately, cause great effect for the operation of blast furnace production system.Simultaneously, owing to add titaniferous material, make the smelting process of blast furnace produce significant change, need to adjust the blast furnace operating system, can cause the decline of furnace processor, the difficulty of tapping a blast furnace, slag tap strengthens, and it is improper that operation has slightly, can influence even destroy smooth operation of furnace, to the production smooth running generation great effect of iron and steel enterprise.
Titaniferous material is produced the furnace retaining method that furnace charge adds blast furnace from the blast furnace furnace roof with blast furnace in addition, because producing furnace charge from the blast furnace furnace roof with blast furnace, titaniferous material adds blast furnace, titanyl compound is evenly sneaked in the slag of whole furnace charges in the titaniferous material, titanyl compound concentration in the slag is reduced significantly, cause the add-on of titaniferous material big, utilization ratio is low, the maintenance cost height, thereby be only applicable to the whole maintenance repairing of bottom house furnace lining.
Summary of the invention
At the deficiencies in the prior art, the purpose of this invention is to provide method of on-line thread feeding and furnace protecting of ironmaking blast furnace and the employed Yarn feeding device of this method, specifically be under the condition of blast furnace normal operation, use Yarn feeding device, by blast furnace wait to safeguard, the blast-furnace coal powder injection mouth on repairing area top, the cored-wire that will contain titaniferous material is sent in the stove, and realization is carried out on-line maintenance and repairing for the furnace lining at blast furnace hearth, furnace bottom position safely and effectively.
Method of on-line thread feeding and furnace protecting of ironmaking blast furnace is: use the cored-wire passage of Yarn feeding device that the pci port that the titaniferous cored-wire passes through is sent into blast furnace, (high-pressure air, coal injection system purges N to the line feeding rifle utilization protection gas in the Yarn feeding device
2Gas) at a high speed form velocity pressure at the cored-wire passage front end of line feeding rifle greater than pressure of blast by the winding-up circumferential weld; stop high pressure, the high temperature blast of blast furnace to leak by the cored-wire passage; the radial slider sealing stops leaking of shielding gas, guarantees the safety of line feeding operation.Cored-wire enters in the blast furnace behind the raceway by pci port, titaniferous furnace retaining material sintering, fusing when cored-wire shell iron sheet dissolves under high temperature action, and incorporate immediately in the furnace charge of decline, furnace retaining material in the cored-wire does not produce dispersion, drift after entering blast furnace, be enriched in line feeding point bottom fully, effectively improve TiO in this zone slag
2Concentration and the formation speed of the carbonitride of titanium, realize online, the fixed point of the following cupola well in air port, furnace bottom furnace lining are safeguarded, repaired.
Implementing the employed Yarn feeding device of aforesaid method, is a cored-wire passage that be made from multiple components, dismountable, that be connected with the pci port security seal, and feeding wire machine is sent into titaniferous furnace retaining cored-wire in the State of Blast Furnace along the cored-wire passage of Yarn feeding device.
Yarn feeding device by line feeding conduit, line feeding rifle, connect intercepting valve, radially slide sealing, sound damper, cored-wire receiver connect successively;
The line feeding rifle is made up of shell and interior pipe, and interior pipe is the cored-wire passage, is protection gas air chamber between inner and outer pipe, and the shielding gas conduit is communicated with air chamber by the shielding gas intercepting valve.
When implementing the line feeding operation; coupling device feeds protection gas in advance; adjusting protection atmospheric pressure reaches 1.5～2.0 times of blast furnace blast; again coal spouting gun is extracted from pci port; insert pci port with the line feeding conduit 2 that is about to coupling device; and line feeding rifle sealed interface 3 is connected with pci port, check connect sealing reliable after, can carry out the line feeding operation.The conversion of coal spouting gun and Yarn feeding device is according to the sealed structure form of former coal spouting gun, and factory operates, the difference of safety regulations, can do to carry out under the condition at full blast, also can carry out under checking or damping down condition.Even doing to carry out under the condition conversion of coal spouting gun and coupling device at full blast also is safe.
After finishing the conversion of coal spouting gun and coupling device, starting feeding wire machine sends into the furnace retaining cored-wire in the stove by the cored-wire passage of coupling device, observe the motion morphology of cored-wire before the air port by the air port peep hole, and the temperature of blast furnace blast, degree of enrichment and air port working order adjustment wire-feeding velocity, enter continuous line feeding operation.
Advantage of the present invention:
1). can realize accurately that fixed point is safeguarded, repairing
Need safeguard the coal powder injection hole of the air feed belly pipe of repairing area top from blast furnace hearth, furnace bottom, by custom-designed Yarn feeding device, in titaniferous furnace retaining material package heart yearn feeding stove, cause the titaniferous concentration of material in this zone furnace sharply to increase, along with the reduction of material in the stove, titaniferous material produces reduction and crosses carbon, the nitride that reduction generates titanium.The carbon of titanium, nitride form high-melting-point, invade the furnace retaining material of profit mutually with furnace lining with relevant composition in the slag, and then form new protective layer reach the purpose of safeguarding and repairing on the surface of this former furnace lining in zone.
Since in the stove only the part below the air port in line feeding zone have the titaniferous material of high density, thereby, the above zone of blast-furnace tuyere is not produced any influence, can not change blast furnace production operation condition fully and carry out the furnace retaining operation.Simultaneously and since in the stove only the part below the air port in line feeding zone have the titaniferous material of high density, can implement accurately cupola well, furnace bottom fixed point are safeguarded and repaired.
2). the pci port with the blast furnace belly pipe is an access point
It is the interior access point of titaniferous furnace retaining material package heart yearn feeding stove that the present invention selects the pci port of blast furnace air feed belly pipe, can reduce the hot blast static pressure of titaniferous furnace retaining material package heart yearn feeding mouth; Can shorten the range ability of titaniferous furnace retaining material package heart yearn at the line feeding conduit; Can reduce the line feeding resistance of titaniferous furnace retaining material package heart yearn, improve the operating condition of thread feeding and furnace protecting.
3). reduce the interference of thread feeding and furnace protecting, improved the operability of thread feeding and furnace protecting operation the blast furnace normal operation
Blast-furnace tuyere is most important position in the operation of blast furnace, is that the blast furnace operating personnel must often observe the position of carrying out normal running.If the furnace retaining cored-wire in air port peep hole feeding stove, will make the air port forfeiture of line feeding operation spy on the function of air port situation in the blast furnace, changed blast furnace operation personnel's operating condition, the normal operation of blast furnace there is tangible interference.Simultaneously also make the line feeding operation become total blindness's operation, operator can't observe motion and the melted state after the furnace retaining cored-wire enters in the stove, can't accurately adjust wire-feeding velocity according to the stove internal state.And this invents " the coal powder injection hole by blast furnace air feed belly pipe feeds titaniferous furnace retaining material package heart yearn in the stove ", has kept the function of air port peep hole and peep hole fully, can reduce the interference of thread feeding and furnace protecting to the blast furnace normal operation.
Thread feeding and furnace protecting is a new technology, and the kinestate after operator enter in the stove to the furnace retaining cored-wire, cored-wire very are concerned about with the situation that contacts in air port and the melting conditions of cored-wire." the coal powder injection hole by blast furnace air feed belly pipe feeds titaniferous furnace retaining material package heart yearn in the stove " kept the function of line feeding air port peep hole, for foundation stove internal state is accurately adjusted wire-feeding velocity; Condition has been created in the loading and unloading of Yarn feeding device during for minimizing line feeding operation, has improved the operability of thread feeding and furnace protecting operation.
Be connected and being connected of pulverized coal injection device and pci port of the Yarn feeding device of this invention design and pci port are adopted identical structure, may be implemented in the line mutual alternative, have improved the operability of online thread feeding and furnace protecting operation.
4). Yarn feeding device is safe and reliable
The Yarn feeding device of the present invention's design utilizes ejector principle; offset blast furnace blast pressure with the pressure field that the injection of shielding gas produces; guarantee no matter whether Yarn feeding device carry out the line feeding operation; the high pressure of blast furnace, high-temperature hot-air can not leak from the cored-wire passage of Yarn feeding device, guarantee the personnel of line feeding operation and the safety of equipment.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 is the synoptic diagram of this Yarn feeding device.
Fig. 2 is the structural representation of line feeding rifle in the Yarn feeding device.
Embodiment
As shown in Figure 1; Yarn feeding device by cored-wire conduit 2, sealed interface 3, line feeding rifle 4, connect intercepting valve 6, radially slide sealing 7, sound damper 8, cored-wire receiver 9; and the protection gas system composition of protecting atmospheric pressure table 5, shielding gas stopping valve 10, shielding gas pipeline 11 to constitute, 1 among Fig. 1 is the blast furnace belly pipe.
Sealed interface 3 is to implement the device that line feeding rifle and pci port on the belly pipe are connected and seal;
The structure of line feeding rifle 4 is seen Fig. 2, the line feeding rifle is made up of shell 12 and interior pipe 13, interior pipe is the cored-wire passage, in, be protection gas air chamber between outer tube, high voltage protective gas is through shielding gas conduit 11 when implementing the line feeding operation, shielding gas intercepting valve 10 enters into air chamber, high voltage protective gas is injected in the cored-wire passage of rifle front end with high speed by the ring nozzle between pipe and line feeding rifle shell in the line feeding rifle, form the velocity pressure greater than blast-furnace hot-air pressure in the cored-wire passage before shielding gas sprays into intersection point, this velocity pressure stops blast furnace blast or blast furnace gas to leak by the cored-wire passage;
Connecting intercepting valve 6 is shifters that coupling device carries out operation or stops operation, connect intercepting valve two valve plates are arranged, valve plate and parts 4,7,8,9 are assembled into one, use during for the line feeding operation, another valve plate is a blind plate, when stopping line feeding, takes off the valve plate that is assembled into one with parts 4,7,8,9, be replaced with the blind plate valve plate, be used for cutting off line feeding rifle and extraneous passage;
Radially sliding sealing 7 is to deform behind the feeding wire machine Wire Wheel at cored-wire specially, and deformation extent and shape are the characteristics of dynamic change and design radially slide tightness system.Radially slide the cored-wire passage that sealing slide block that tightness system radially is free to slide by several piece is formed, the sealing slide block is fastened on the shell with spring, the sealing slide block is remained with the tight of cored-wire by the effect of spring pressure to contact, when cored-wire deforms or implements sealing during axial displacement, reduce leaking of protection gas;
Cored-wire receiver 9 is facilities of direct packets heart yearn admission passage;
When implementing the line feeding operation; coupling device feeds protection gas in advance; adjusting protection atmospheric pressure reaches 1.5～2.0 times of blast furnace blast; again coal spouting gun is extracted from pci port; insert pci port with the line feeding conduit 2 that is about to coupling device; and line feeding rifle sealed interface 3 is connected with pci port, check connect sealing reliable after, can carry out the line feeding operation.The conversion of coal spouting gun and Yarn feeding device is according to the sealed structure form of former coal spouting gun, and factory operates, the difference of safety regulations, can carry out under the full blast operating condition, also can carry out under checking or damping down condition.Even it also is safe carrying out the conversion of coal spouting gun and coupling device under the full blast operating condition.
After finishing the conversion of coal spouting gun and coupling device, starting feeding wire machine sends into the furnace retaining cored-wire in the stove by the cored-wire passage of coupling device, observe the motion morphology of cored-wire before the air port by the air port peep hole, and the temperature of blast furnace blast, degree of enrichment and air port working order adjustment wire-feeding velocity, enter continuous line feeding operation.
The invention main points of online thread feeding and furnace protecting technology of this blast furnace and device are: selecting the coal powder injection hole of blast furnace air feed belly pipe is access point, with custom-designed Yarn feeding device safety, successive titaniferous furnace retaining material package heart yearn is fed in the stove, do not influencing the blast furnace ordinary production, do not change under the condition of blast furnace normal running system and operating environment, implement the cupola well below the blast-furnace tuyere, furnace bottom furnace lining are safeguarded, repaired.
The present invention has been a 2500m
3The blast furnace specialized designs has also been produced corresponding Yarn feeding device, adopts this kind method to implement furnace retaining.The cored-wire diameter that uses is 13mm, and blast furnace blast pressure is 0.45MPa,, line feeding rifle 4 shielding gas are N
2Gas, pressure are 0.90MPa.The line feeding amount is 15～40kg/min.Result of implementation shows that this invention is that a kind of effective blast furnace hearth, furnace bottom are safeguarded, repairing technique, and designed Yarn feeding device is safe and reliable, and easy to operate practicality.
Claims (3)
1. method of on-line thread feeding and furnace protecting of ironmaking blast furnace, it is characterized in that: use a Yarn feeding device to be connected with the pci port of blast furnace blast belly pipe, rely on feeding wire machine that furnace retaining material cored-wire is sent in the State of Blast Furnace along the cored-wire passage of Yarn feeding device, the interface of furnace retaining material cored-wire feeding blast furnace is the pci port of blast furnace blast belly pipe.
2. implement the Yarn feeding device of the described method of on-line thread feeding and furnace protecting of ironmaking blast furnace of claim 1, it is characterized in that: by line feeding conduit, line feeding rifle, connect intercepting valve, radially slide sealing, sound damper, cored-wire receiver connect successively; The line feeding rifle is made up of shell and interior pipe, and interior pipe is the cored-wire passage, is protection gas air chamber between inner and outer pipe, and the shielding gas conduit is communicated with air chamber by the shielding gas intercepting valve.
3. according to the Yarn feeding device of the described method of on-line thread feeding and furnace protecting of ironmaking blast furnace of claim 2, it is characterized in that: the sealed interface that it makes line feeding rifle and pci port on the belly pipe be connected and seal in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100125613A CN101109024A (en) | 2007-08-24 | 2007-08-24 | Method of on-line thread feeding and furnace protecting of ironmaking blast furnace and thread feeding device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100125613A CN101109024A (en) | 2007-08-24 | 2007-08-24 | Method of on-line thread feeding and furnace protecting of ironmaking blast furnace and thread feeding device thereof |
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| CN101109024A true CN101109024A (en) | 2008-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100125613A Pending CN101109024A (en) | 2007-08-24 | 2007-08-24 | Method of on-line thread feeding and furnace protecting of ironmaking blast furnace and thread feeding device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115798A (en) * | 2009-12-31 | 2011-07-06 | 宝钢集团新疆八一钢铁有限公司 | Method for protecting blast furnace by injecting coal and spraying schreyerite powder |
| CN103045799A (en) * | 2012-08-08 | 2013-04-17 | 湖北亚克新材料有限公司 | Wire stock conveying device and method |
| CN103045800A (en) * | 2012-08-08 | 2013-04-17 | 湖北亚克新材料有限公司 | Wire stock conveyor and method |
| TWI402349B (en) * | 2009-08-17 | 2013-07-21 | China Steel Corp | Quick protection system and method |
| CN106350629A (en) * | 2016-08-29 | 2017-01-25 | 北京首钢国际工程技术有限公司 | Protection method of the lining of HIsmelt process smelting reduction furnace |
| CN112176134A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Furnace protection material core wire and using method thereof |
-
2007
- 2007-08-24 CN CNA2007100125613A patent/CN101109024A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI402349B (en) * | 2009-08-17 | 2013-07-21 | China Steel Corp | Quick protection system and method |
| CN102115798A (en) * | 2009-12-31 | 2011-07-06 | 宝钢集团新疆八一钢铁有限公司 | Method for protecting blast furnace by injecting coal and spraying schreyerite powder |
| CN103045799A (en) * | 2012-08-08 | 2013-04-17 | 湖北亚克新材料有限公司 | Wire stock conveying device and method |
| CN103045800A (en) * | 2012-08-08 | 2013-04-17 | 湖北亚克新材料有限公司 | Wire stock conveyor and method |
| CN106350629A (en) * | 2016-08-29 | 2017-01-25 | 北京首钢国际工程技术有限公司 | Protection method of the lining of HIsmelt process smelting reduction furnace |
| CN112176134A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Furnace protection material core wire and using method thereof |
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