CN104073579A - Schreyerite furnace protection method and device - Google Patents
Schreyerite furnace protection method and device Download PDFInfo
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- CN104073579A CN104073579A CN201310103089.XA CN201310103089A CN104073579A CN 104073579 A CN104073579 A CN 104073579A CN 201310103089 A CN201310103089 A CN 201310103089A CN 104073579 A CN104073579 A CN 104073579A
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- schreyerite
- nitrogen
- store holder
- pressure
- blast furnace
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Abstract
The invention discloses a schreyerite furnace protection method and a device. According to the method and the device, a stocker containing schreyerite powder, which is disposed in a mobile vehicle, is pressurized by utilization of nitrogen so as to guarantee that the stocker is slightly pressurized, a feeder is opened, the concrete schreyerite powder is injected into a blast furnace by utilization of nitrogen through a tuyere, and the stocker is subjected to on-line real-time weighing control during injection. The stocker, a nitrogen bottle, the feeder and other auxiliary devices are installed on the mobile vehicle, the injection tuyere position is adjusted by moving the mobile vehicle, a discharging valve at the bottom of the stocker is connected to the feeder, and the lower part of the stocker is provided with a nozzle. The method and the device can inject the schreyerite to a specific area, movement is convenient and operation is simple. The method and the device achieve an effect of on-line furnace protection and prolong the service lifetime of the blast furnace. By setting the pressure of the schreyerite in the stocker and the pressure in the nitrogen bottle, the schreyerite injection amount is controlled quantitatively, and accurate control of blast furnace schreyerite-injection furnace protection can be achieved.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, method and device that particularly a kind of iron-smelting blast furnace is repaired online and safeguarded the following cupola well in air port, bottom lining.
Background technology
High utilization factor is one of Main Economic technical indicator of blast furnace pursuit, but the raising along with smelting strength of blast furnace, the thermal load that blast furnace bears also increases thereupon, the liner of the following cupola well of cohesive zone, furnace bottom comes off for a long time under the effect of chemical erosion, mechanical erosion, thermal stresses, and cause cooling stave Working environment the thermal stresses extremely and abnormal erosion of furnace bottom and cupola well intersection etc. become the principal element that affects blast furnace campaign.In order to extend blast furnace campaign, most of blast furnaces adopt titaniferous material furnace retaining.In adding of titaniferous material, on opportunity, mainly comprise 1. after blast furnace opening (half a year or 1 year) soon, just with a small amount of titaniferous material, use and carry out furnace retaining continuously; While 2. occurring deteriorating in cupola well part, appropriateness increases titaniferous material again, simultaneously a part for conventional smelting system using titaniferous material furnace retaining as blast furnace.At present, schreyerite adds method to mainly contain 1. top addition method.The method is that SUMITOMO CHEMICAL metal company was developed the 1950's, but the method can not effectively be processed cupola well local damage.When add-on is few, can not repair efficient hardening part, furnace retaining DeGrain, when add-on is large, is prone to hearth accumulation phenomenon, and smelting strength of blast furnace is controlled, utilization coefficient is lower; 2. stemming addition method.This method can not effectively be processed cinder notch position and corrode, and the cycle that simultaneously takes effect is longer; 3. air port feeds cored collimation method.The method is suitable for processing cupola well localized attack, but larger to the wearing and tearing in air port, and the shared limited space of feeding wire machine, the vanadium titanium furnace retaining material upper limit amount of jetting are limited by wire-feeding velocity.
Patent " pulverized coal injection is with addition of the method for schreyerite powder winding-up furnace retaining " (application number: 201010577759.8) disclose a kind of pulverized coal injection with addition of the method for schreyerite powder winding-up furnace retaining.The method use the existing coal powder injection equipment of iron work by powdery vanadium titanium material continuous uniform with addition of in raw coal, utilize the powder process of coal powder injection facility and injection system, pass through power transportation pipe, after pulverized coal distributor distributes, the coal spouting gun that powdery vanadium titanium material is inserted from blast-furnace tuyere belly pipe sprays into blast furnace hearth.Though the method can be repaired and safeguard cupola well, furnace bottom online, but the method for privileged site, do not safeguard, without specific aim and measure wayward.
Patent " furnace protecting method of iron-smelting blast furnace " (application number: 201210003044.0) disclose a kind of furnace protecting method of iron-smelting blast furnace.The method technical scheme is: titaniferous material is sprayed in blast furnace from air port, utilize and wherein contain Ti element, generate high-melting-point substances TiCN protect furnace bottom not weather at furnace bottom.The method has solved the weak point of top addition method, but to whether jetting together with coal dust actually, (use what equipment) in which way and jet, how targetedly damage location jetted and repaired and the control mode of furnace retaining material winding-up amount etc. is not all handed over.
Patent " a kind of maintaining method for blast furnace " (application number: 200810069461.9) disclose a kind of maintaining method for blast furnace, the method is by taking that body of heater grouting is carried out in the high position of casing temperature, copper-bar cooler is installed in cooling wall breakage position, the lining of shaft is sprayed and makes the way that lining combines; Wherein, the mode of pressing-in grouting is taked in grouting, and High-Alumina refractory matter is pressed in furnace shell by grout machine; After the empty stockline of lining is made in spraying, damping down sprays shaft damaged part.Adopt the inventive method, to body of heater, destroy heavier; More seriously " high-pressure grouting " is serious to the body of heater device squeeze and destroy of part that slurry is filled with.
The method can not be repaired the liner of cupola well and furnace bottom, cannot the impact on cooling stave from effective solution cupola well built-in thermal stress.
These methods are all in stove, to add vanadium titanium furnace retaining material, difference is that reinforced mode is different with method, and these methods equal Shortcomings to a certain extent, therefore need a kind of novel method of exploitation badly and solve this problem, under the prerequisite that does not affect the normal production of blast furnace, online it is safeguarded, to extend the work-ing life of blast furnace.
Summary of the invention
The object of the present invention is to provide a kind of targetedly, portable and schreyerite maintenance method and the device that can quantitatively control, realize the online reparation to blast furnace, to extend the work-ing life of blast furnace.
Feature of the present invention is, with nitrogen, give and be placed in the store holder pressurising that fills schreyerite powder on travelling car, it is guaranteed as pressure-fired, unlatching is fixed on the material feeder of store holder lower end, with nitrogen by vanadium ilmenite concentrate powder in air port sprays into blast furnace, realize quantitative control and the online repairing effect to blast furnace of winding-up schreyerite; During winding-up, store holder is carried out to online Weighing control in real time, mobile travelling car is adjusted injection tuyere position;
Concrete technology is as follows:
1) pressure-fired is to guarantee that the schreyerite winding-up in store holder is smooth and easy, and regulates pressure by dynamic valve, changes the nebulizer gas pressure in nitrogen pot, and requiring its pressure is pressure-fired, and the pressure in store holder keeps the pressure-fired of 20～50Pa; At the same time schreyerite is carried out to fluidisation, to eliminate store holder wall to the mutual cohesive action between the flow boundary layer of schreyerite and schreyerite, requirement can make frictional belt distribute and produce disturbance;
2) by variable valve, regulate the nitrogen pressure of nitrogen pot to be stabilized between 0.8～1.2MPa;
3) material feeder utilizes nitrogen that schreyerite powder is sprayed in blast furnace, and injection rate is 26.04～104.17kg/min, schreyerite add-on 5～20kg/t pig iron.
4) weigh in real time the schreyerite weight in store holder, by the reduction of schreyerite in the instantaneous reflection store holder of manometric balance is set on store holder, to determine amount and the store holder charge time next time that is sprayed on certain breakage Gunning refractory;
According to the concrete situation of blast furnace hearth, bearth damage, mobile travelling car, to adjust injection tuyere position.
The device of a kind of schreyerite maintenance method that the present invention is used, by store holder, manometric balance, nozzle, baiting valve, material feeder, travelling car, nitrogen pot, formed, store holder, nitrogen pot, material feeder are placed on travelling car, the baiting valve of store holder bottom connects material feeder, nitrogen pot one end is connected by flange with material feeder, store holder bottom is furnished with nozzle, nitrogen pot supervisor connects nitrogen pipeline by valve, arm on nitrogen pot is connected with nozzle and store holder top on store holder respectively, and store holder middle part is furnished with manometric balance.
Concrete structure of the present invention has, and material feeder is fixed on travelling car by bracing or strutting arrangement, and described travelling car is provided with locking device.
Adopt the present invention to have and can realize following positive effect:
1, the present invention is by store holder, nitrogen pot and material feeder and other auxiliary equipment are arranged on travelling car, for the specific region schreyerite of jetting, and conveniently moving, simple to operate, reached the effect of online furnace retaining, extended the work-ing life of blast furnace;
2, by the schreyerite in store holder and the pressure in nitrogen pot, set, schreyerite winding-up amount is quantitatively controlled, can realize the accurate control of blast furnace blowing schreyerite maintenance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1 store holder, 2 schreyerite, 3 manometric balances, 4 nozzles, 5 baiting valves, 6 material feeders, 7 bracing or strutting arrangements, 8 tensimeters, 9 diffusion valves, 10 nitrogen pipelines, 11 are flexible coupling, 12 ball valves, 13 nitrogen pots, 14 travelling cars, 15 drain valves, 16 flanged valves, 17 manual valves, 18 dynamic valves, 19 pressure warning units.
Embodiment
Below in conjunction with accompanying drawing, technological process of the present invention is elaborated:
As shown in the figure, when blast furnace carries out schreyerite maintenance, a certain amount of vanadium ilmenite concentrate of the interior prior storage of store holder 1 powder.While N
2by nitrogen pipe network 10, by being flexible coupling, 11 through ball valve 12, enter nitrogen pot 13.According to the instant measured value of tensimeter 8, if the hypertonia in nitrogen pot 13 is diffused by diffusion valve 9, make pressure-stabilisation between 0.8～1.2MPa, realize the stable of supply gas pressure, regular carrying out carries out draining by drain valve 15 simultaneously.High pressure N
2by nitrogen pot 13, through flanged valve 16, enter material feeder 6, at the discharge end of store holder 1 and the junction of material feeder 6, form local decompression, make schreyerite 2 through baiting valve 5, enter material feeder 6 by the bottom port of store holder 1, thus high pressure N
2make schreyerite 2 through air port, flow to blast furnace with the injection rate of 26.04～104.17kg/min, thereby reach to the online object of repairing of blast furnace, if the too high blast furnace hearth inwall that easily makes of straying quatity freezes.Simultaneously in order to reduce the resistance of store holder 1 wall to schreyerite 2, by part N
2by nitrogen pot 13, in manual valve 17 sprays into store holder 1, both reduced the wall resistance of store holder 1, made again schreyerite 2 fluidizations.For schreyerite 2 is entered in material feeder 6 smoothly, make part N
2by nitrogen pot 13, through dynamic valve, enter store holder 1 and be presented on pressure warning unit 19, thereby the pressure in store holder 1 is remained between 20～50Pa, forming pressure-fired.
Quantitative control program of the present invention is: the real-time data to manometric balance 3 and tensimeter 8 gather, if the numerical value that manometric balance 3 shows is too low, shows schreyerite 2 deficiencies in store holder 1, needs by regulating the N in nitrogen pot 13
2pressure comes guarantor unit's time to the material spray amount of blast furnace, simultaneously to the interior increase schreyerite of store holder 1.Thereby reach the object of quantitative control, realize the accurate control to blast furnace blowing schreyerite.
Device involved in the present invention is arranged on travelling car 14 after denitrogenating that gas pipe network 10 is outer and all connecting, and wherein store holder 1, material feeder 6 are fixed on travelling car 14 by bracing or strutting arrangement 7.Reach conveniently moving, object swift to operate.
Embodiment
With volume 3200m
3blast furnace be example, during smooth operation of furnace, within every two hours, going out an iron family planning iron amount is 625t.The add-on of schreyerite maintenance is 5～20kg/t pig iron, wherein blast furnace is produced early stage by 6～10 kg/t pig iron, later stage is by 12～16 kg/t pig iron schreyerite of jetting, total add-on 5～20kg schreyerite/t pig iron, early stage is by 6～10 kg schreyerite/t pig iron, later stage is by 12～16 kg schreyerite/t pig iron, its N
2pressure is higher than pressure of air supply, i.e. 0.8～1.2MPa.
Blast furnace is produced early stage, and by ton pig iron schreyerite straying quatity 8 kg, two hours schreyerite straying quatities are 5t, and straying quatity is 41.7kg/min, required N
2pressure is 0.9MPa.
All devices of the present invention are removed to nitrogen pipeline 10 to be placed on travelling car 14.Guarantee that the schreyerite 2 in store holder 1 has enough amounts.Open nitrogen that ball valve 12 makes 1.2MPa and through being flexible coupling, 11 enter nitrogen pot 13 from nitrogen pipeline 10, in nitrogen pot 13 internal pressures, be stabilized to 0.9MPa and enter material feeder 6 by flanged valve 16, in the lower port of store holder 1 and the junction of material feeder 6, form local decompression, now open baiting valve 5, owing to keeping the pressure in store holder 1, be pressure-fired, thus can make schreyerite 2 under the effect of pressure and self gravitation in baiting valve 5 enters material feeder 6 and N
2mix.In this process, due to schreyerite 2 flow boundary layer on the wall of store holder 1, for eliminating the impact in frictional belt and the cohesive action between schreyerite, make a part of N
2by nitrogen pot 13, by manual valve 17, entered in store holder 1, make schreyerite 2 fluidizations near wall.For guaranteeing that in store holder 1 be pressure-fired, make part N simultaneously
2by nitrogen pot 13, by dynamic valve 18, enter in discharger 1 and be presented on pressure warning unit 19, can be by regulating the aperture of dynamic valve 18 to regulate the pressure in store holder 1.Schreyerite 2 and N
2in the interior mixing of material feeder 6, by air port, spray into blast furnace, thereby realize removable, schreyerite maintenance targetedly, can accurately control the straying quatity of schreyerite simultaneously, reach online reparation and safeguard blast furnace, to extend the blast furnace object in work-ing life.
Blast furnace is produced the later stage, and by ton pig iron schreyerite straying quatity 16kg/t pig iron, two hours schreyerite straying quatities are 10t, and straying quatity is 83.4kg/min, required N
2pressure is 1.1MPa.Open nitrogen that ball valve 12 makes 1.2MPa and through being flexible coupling, 11 enter nitrogen pot 13 from nitrogen pipeline 10, in nitrogen pot 13, make pressure-stabilisation by flanged valve 16, enter material feeder 6 to 1.1MPa, in the lower port of store holder 1 and the junction of material feeder 6, form local decompression, now open baiting valve 5, owing to keeping the pressure in store holder 1, be pressure-fired, thus can make schreyerite 2 under the effect of pressure and self gravitation in baiting valve 5 enters material feeder 6 and N
2mix, according to the pressure in the displayed value adjusting nitrogen pot 13 of manometric balance 3, can accurately control the straying quatity of schreyerite.Schreyerite 2 and N
2in the interior mixing of material feeder 6, by air port, spray into blast furnace.
Claims (3)
1. a schreyerite maintenance method, it is characterized in that, with nitrogen, give and be placed in the store holder pressurising that fills schreyerite powder on travelling car, be pressure-fired, open material feeder, with nitrogen by vanadium ilmenite concentrate powder in air port sprays into blast furnace, during winding-up, store holder is carried out to online Weighing control in real time, mobile travelling car is adjusted injection tuyere position;
Concrete technology is as follows:
1) pressure in store holder keeps the pressure-fired of 20～50Pa;
2) by variable valve, regulate the nitrogen pressure of nitrogen pot to be stabilized between 0.8～1.2MPa;
3) material feeder utilizes nitrogen that schreyerite powder is sprayed in blast furnace, and injection rate is 26.04～104.17kg/min, schreyerite add-on 5～20kg/t pig iron;
4) weigh in real time the schreyerite weight in store holder.
2. the device for a kind of schreyerite maintenance method claimed in claim 1, it is characterized in that, by store holder, manometric balance, nozzle, baiting valve, material feeder, travelling car, nitrogen pot, formed, store holder, nitrogen pot, material feeder are placed on travelling car, the baiting valve of store holder bottom connects material feeder, nitrogen pot one end is connected by flange with material feeder, store holder bottom is furnished with nozzle, nitrogen pot supervisor connects nitrogen pipeline by valve, arm on nitrogen pot is connected with nozzle and store holder top on store holder respectively, and store holder middle part is furnished with manometric balance.
3. the device of a kind of schreyerite maintenance method according to claim 2, is characterized in that, material feeder is fixed on travelling car by bracing or strutting arrangement, and described travelling car is provided with locking device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310103089.XA CN104073579A (en) | 2013-03-27 | 2013-03-27 | Schreyerite furnace protection method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310103089.XA CN104073579A (en) | 2013-03-27 | 2013-03-27 | Schreyerite furnace protection method and device |
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| CN104073579A true CN104073579A (en) | 2014-10-01 |
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| CN201310103089.XA Pending CN104073579A (en) | 2013-03-27 | 2013-03-27 | Schreyerite furnace protection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593033A (en) * | 2020-12-08 | 2021-04-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for using vanadium-titanium magnetite concentrate in blast furnace |
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|---|---|---|---|---|
| JP2000204405A (en) * | 1999-01-13 | 2000-07-25 | Kawasaki Steel Corp | Operation of blast furnace |
| KR20030054455A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | A DEVICE OF INSERTING TiO2 INTO FURNACE |
| 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 |
| CN102433405A (en) * | 2012-01-06 | 2012-05-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace protecting method of iron-smelting blast furnace |
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2013
- 2013-03-27 CN CN201310103089.XA patent/CN104073579A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000204405A (en) * | 1999-01-13 | 2000-07-25 | Kawasaki Steel Corp | Operation of blast furnace |
| KR20030054455A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | A DEVICE OF INSERTING TiO2 INTO FURNACE |
| 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 |
| CN102433405A (en) * | 2012-01-06 | 2012-05-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Furnace protecting method of iron-smelting blast furnace |
Non-Patent Citations (2)
| Title |
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| 杨绍利等: "高炉喷吹物料及其演变趋势", 《钢铁钒钛》 * |
| 程常桂等: "《铁水预处理》", 31 August 2009, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593033A (en) * | 2020-12-08 | 2021-04-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for using vanadium-titanium magnetite concentrate in blast furnace |
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Application publication date: 20141001 |