CN105586458A - Iron notch burn-through method for blast furnace to return to work - Google Patents
Iron notch burn-through method for blast furnace to return to work Download PDFInfo
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- CN105586458A CN105586458A CN201610120073.3A CN201610120073A CN105586458A CN 105586458 A CN105586458 A CN 105586458A CN 201610120073 A CN201610120073 A CN 201610120073A CN 105586458 A CN105586458 A CN 105586458A
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- oxygen
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- iron mouth
- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
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Abstract
The invention discloses an iron notch burn-through method for a blast furnace to return to work. The burn-through method comprises the steps that blast furnace iron notches are drilled through by an iron notch drill, and an oxygen supply pipe is embedded to convey oxygen into the iron notches so as to assist internal burning of the iron notches. The burn-through method is characterized in that the front end of the oxygen supply pipe is provided with a temperature measuring galvanic couple which is used for detecting the front end temperature of the oxygen supply pipe in the process that the oxygen supply pipe conveys the oxygen to assist burning; when the detected temperature is higher than a preset control temperature, the temperature measuring galvanic couple is controlled to be retracted by a distance till the detected temperature is lower than the preset control temperature; meanwhile, the oxygen supply pipe is controlled to move forward by the same distance, so that a front end outlet of the oxygen supply pipe is kept to being located in the same depth so as to achieve continuous burning through. The iron notch burn-through method for the blast furnace to return to work has the advantages that operating is easy, the service life of the equipment is long, the continuity is good, and the burn-through efficiency is high.
Description
Technical field
The present invention relates to steel-making blast furnace technical field, relate in particular to a kind of blast furnace return to work iron mouth burn circulation method.
Background technology
Have multiple air ports to air blast in stove for its cupola well top circumferencial direction of blast furnace of smelting iron, multiple iron mouths for slagging iron are arranged at bottom, and generally, blast furnace has 1-4 iron mouth. And in the daily production of blast furnace, need problem in the organization of production balances such as long-time repairings, production-supply-marketing etc. due to substantial equipment fault, can cause temporarily not needing continuing to produce blast furnace being sealed or causing gobbed up because of operate miss. At this moment, the slag, the iron condensation between coke gap most probably that in blast furnace crucibe, retain, cause slag, the iron of blast furnace air-supply upper back fusing to be difficult to be penetrated into cupola well bottom, can not in time the slag iron of fusing be discharged from iron mouth. Very easily cause accidents such as burning out the medium and small cover in air port, also unfavorable to furnace condition recovery. So, meeting this class situation, before furnace compound wind, need by iron mouth and above air port be communicated with, can avoid accident or accelerate furnace condition recovery progress, can greatly reduce the coke of loss between convalescence.
In prior art, recover the connection between iron mouth and air port, normally directly adopt oxygen rifle to burn to iron mouth interal supplying oxygen, in conventional oxygen rifle structure be exactly mainly an oxygen pipe of growing, be embedded to oxygen supply in iron mouth and burnt; Generally need one day above time owing to burning iron mouth, blast furnace internal temperature is higher, and device leading portion oxygen pipe is easily burned in burning iron is made a slip of the tongue journey, causes device to need more sliding oxygen rifle continually. Like this, can cause on the one hand and burn the make a slip of the tongue poor continuity of journey of iron, can cause on the other hand a large amount of wastes of device.
China's number of patent application 201410420755.7 once disclosed a kind of blast furnace and had burnt oxygen device, comprised handling section and burnt iron mouth section, and one end sealing of burning iron mouth section one end and handling section is detachable fixing, and the other end of handling section is fixing by flexible pipe and the sealing of oxygen bag. Like this, burn the burning iron mouth segment structure of oxygen device leading portion and can replace, can improve metal tube utilization rate.
But the blast furnace of above-mentioned this structure burns oxygen device, because oxygen supply after-combustion temperature in blast furnace is higher, still can cause burning iron mouth section to be burned very soon, service life is short, need often to change, therefore still there is the large and higher defect of cost of poor continuity, weak effect, environmental pollution.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical problem to be solved by this invention is: how to provide a kind of simple to operate, burn fexible unit long service life, continuity is good, burns the logical high blast furnace of the efficiency iron mouth of returning to work and burns circulation method.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of blast furnace iron mouth of returning to work burns circulation method, comprise and adopt iron notch drill to drill blast furnace taphole and imbed oxygen supplying tube oxygen is sent into the auxiliary internally fired step of iron mouth, it is characterized in that, at oxygen supplying tube front end, thermometric galvanic couple is set, in sending the process of oxygen auxiliary combustion, oxygen supplying tube detects oxygen supplying tube front end temperature, when higher than default control temperature, control thermometric galvanic couple retract a segment distance to detected temperatures lower than default control temperature, control oxygen supplying tube simultaneously and move forward same distance, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logical.
Like this, can make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logically, greatly improve and burnt logical efficiency.
Adopt following iron notch to burn exchange device realization as optimizing; described device comprises and is positioned at the handling section at rear portion and is positioned at anterior burning iron mouth section; in handling section, be provided with air supply channel and for being connected with source of oxygen; burn iron mouth section and comprise that an entirety is the oxygen supplying tube of elongated tubular forward; in oxygen supplying tube rear end and handling section, air supply channel is communicated with setting, and in described burning iron mouth section, oxygen supplying tube outside is also provided with cooling protection structure.
Like this, cooling protection structure is set and oxygen supplying tube is carried out cooling, the time of being burnt to extend oxygen supplying tube, extend its service life.
As optimization; described cooling protection structure; comprise the outer coaxial sheathed outer tube of oxygen supplying tube; outer tube back-end connection is provided with a compressed air hose extending back, and compressed air hose rear end is used for and compressed air source joins and make the space between oxygen supplying tube and outer tube can form cooling-air protective layer.
Like this; can adopt pneumatically pipe to pass into the mode of cooling-air; between oxygen supplying tube and outer tube, form cooling-air protective layer; both can realize the protection to oxygen supplying tube; simultaneously air self can play the effect of strengthening high furnace interior coke burning, therefore have simple in structurely, is beneficial to and realizes cooling to oxygen supplying tube; simultaneously can also auxiliary combustion, improve iron mouth and burn logical efficiency.
As optimization, described oxygen supplying tube front end exceeds outer tube 15-25cm.
Like this, can ensure that oxygen that oxygen supplying tube front end is sent first arrives the combustion zone auxiliary combustion in front, avoids the combustion efficiency of oxygen to be subject to the impact of Dilution air.
As optimization, described burning iron mouth section also comprises a vertical installation base plate arranging, described outer tube back-end sealing is fixed on installation base plate, described oxygen supplying tube rear end is fixed and is passed installation base plate and is provided with connector in port, rear end and handling section removably connects, outer tube is outwards provided with arm near installation base plate position fixing connection, and arm rear end is provided with connector and compressed air hose removably connects.
The each element structure that burns like this iron mouth section is all integrated on installation base plate, makes it simple in structure and be conveniently connected and installed; Realize simultaneously and burnt removably connecting between iron mouth section and handling section and compressed air hose; Be beneficial to, when burning after iron mouth section oxygen supplying tube and the equal scorification of outer tube, can extract in time replacing out, handling section and compressed air hose can be reused, and reduce costs.
As optimization, also comprise temperature-detecting device, temperature-detecting device comprises and is arranged at outer tube front end near the thermometric galvanic couple between port position and oxygen supplying tube, also comprises the galvanic couple controlling organization that can drive thermometric galvanic couple retraction.
Like this, when use, by thermometric galvanic couple, iron mouth section front end place temperature is burnt in monitoring, when detecting that burning iron mouth section front end place temperature has exceeded control temperature and (caused the temperature of oxygen pipe and outer tube melting, be generally 700 DEG C) time, by galvanic couple controlling organization drive thermometric galvanic couple bounce back a segment distance until thermometric galvanic couple detected temperatures lower than controlling temperature, promote to burn iron mouth section by handling section moves forward and the identical distance of thermometric galvanic couple amount of recovery simultaneously, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logically, burn logical efficiency to improve better.
Further, galvanic couple controlling organization, comprise that front end is connected with thermometric galvanic couple, the electric rubber cover wire of rear end for being connected with Surveillance center, also comprise that is set up in parallel and runs through the line cylinder being excessively fixed on installation base plate with oxygen supplying tube, crossing line cylinder front end is positioned at outer tube inside and passes for electric rubber cover wire, cross line tube rear end and be provided with external screw thread and spin and be combined with a nut, in the middle of nut, be provided with via hole, described electric rubber cover wire rear end pass via hole and and via hole interference fit realize sealing.
Like this, in the time that needs thermometric galvanic couple bounces back, only need unscrew nut, then pull electric rubber cover wire that thermometric galvanic couple is retracted to a segment distance, then mobile nut position on electric rubber cover wire forward, then makes nut again be screwed in line tube rear end; Like this, galvanic couple self wire is as a part for galvanic couple controlling organization, simple in structure, and can lean on the elasticity of electric rubber cover wire self and the middle via hole of nut to coordinate realization sealing, therefore have simple in structure, easy to operate, can realize sealing and avoid gas leakage to ensure better to send in iron mouth the advantage of oxygen combustion efficiency.
Further, the described external screw thread front position of crossing line tube rear end is fixedly welded with a hold-down nut. Like this, nut can make its front end and hold-down nut offset spacing and push against and realize lockedly while installation, and simultaneously, in the time of dismounting nut, the convenient spanner that adopts clamps hold-down nut with the application of force, improves dismounting efficiency.
As optimization, on described compressed air hose, be also respectively arranged with compressed air control valve, compressed-air manometer and compressed air require table. Like this, conveniently monitoring and the control to air mass flow.
As optimization, described handling section main body is an oxygen hose, is also respectively arranged with oxygen control valve, oxygen gauge and oxygen flowmete on oxygen hose. Like this, conveniently monitoring and the control to oxygen flow.
In sum, the present invention has simple to operate, and service life of equipment is long, and continuity is good, burns logical efficiency advantages of higher.
Brief description of the drawings
The structural representation of the device that Fig. 1 adopts while being the invention process.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A kind of blast furnace iron mouth of returning to work burns circulation method, comprise and adopt iron notch drill to drill blast furnace taphole and imbed oxygen supplying tube oxygen is sent into the auxiliary internally fired step of iron mouth, it is characterized in that, at oxygen supplying tube front end, thermometric galvanic couple is set, in sending the process of oxygen auxiliary combustion, oxygen supplying tube detects oxygen supplying tube front end temperature, when higher than default control temperature, control thermometric galvanic couple retract a segment distance to detected temperatures lower than default control temperature, control oxygen supplying tube simultaneously and move forward same distance, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logical.
When concrete enforcement: the present invention adopts device as shown in Figure 1 to realize; a kind of iron notch burns exchange device; comprise and be positioned at the handling section 1 at rear portion and be positioned at anterior burning iron mouth section; in handling section 1, be provided with air supply channel and for being connected with source of oxygen; burn iron mouth section and comprise that an entirety is the oxygen supplying tube 2 of elongated tubular forward; the interior air supply channel of oxygen supplying tube 2 rear ends and handling section 1 is communicated with setting, and wherein, in described burning iron mouth section, oxygen supplying tube 2 outsides are also provided with cooling protection structure.
Like this, cooling protection structure is set and oxygen supplying tube is carried out cooling, the time of being burnt to extend oxygen supplying tube, extend its service life.
Wherein, described cooling protection structure; comprise the outer coaxial sheathed outer tube 3 of oxygen supplying tube; outer tube 3 rear ends connections are provided with a compressed air hose extending back 4, and compressed air hose 4 rear ends are used for and compressed air source joins and make the space between oxygen supplying tube 2 and outer tube 3 can form cooling-air protective layer.
Like this; can adopt pneumatically pipe to pass into the mode of cooling-air; between oxygen supplying tube and outer tube, form cooling-air protective layer; both can realize the protection to oxygen supplying tube; simultaneously air self can play the effect of strengthening high furnace interior coke burning, therefore have simple in structurely, is beneficial to and realizes cooling to oxygen supplying tube; simultaneously can also auxiliary combustion, improve iron mouth and burn logical efficiency.
Wherein, described oxygen supplying tube 2 front ends exceed the optimum 20cm of being of outer tube 15-25cm().
Like this, can ensure that oxygen that oxygen supplying tube front end is sent first arrives the combustion zone auxiliary combustion in front, avoids the combustion efficiency of oxygen to be subject to the impact of Dilution air.
Wherein, described burning iron mouth section also comprises a vertical installation base plate 5 arranging, described outer tube 3 back-end sealings are fixed on installation base plate 5, described oxygen supplying tube 2 rear ends are fixed and are passed installation base plate 5 and are provided with connector in port, rear end and handling section 1 removably connects, outer tube 3 is outwards provided with arm 6 near installation base plate 5 positions fixing connection, and arm 6 rear ends are provided with connector and compressed air hose 4 removably connects.
The each element structure that burns like this iron mouth section is all integrated on installation base plate, makes it simple in structure and be conveniently connected and installed; Realize simultaneously and burnt removably connecting between iron mouth section and handling section and compressed air hose; Be beneficial to, when burning after iron mouth section oxygen supplying tube and the equal scorification of outer tube, can extract in time replacing out, handling section and compressed air hose can be reused, and reduce costs.
Wherein, also comprise temperature-detecting device, temperature-detecting device comprises and is arranged at outer tube front end near the thermometric galvanic couple 7 between port position and oxygen supplying tube, also comprises the galvanic couple controlling organization that can drive thermometric galvanic couple retraction.
Like this, when use, by thermometric galvanic couple, iron mouth section front end place temperature is burnt in monitoring, when detecting that burning iron mouth section front end place temperature has exceeded control temperature and (caused the temperature of oxygen pipe and outer tube melting, be generally 700 DEG C) time, by galvanic couple controlling organization drive thermometric galvanic couple bounce back a segment distance until thermometric galvanic couple detected temperatures lower than controlling temperature, promote to burn iron mouth section by handling section moves forward and the identical distance of thermometric galvanic couple amount of recovery simultaneously, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logically, burn logical efficiency to improve better.
Wherein, galvanic couple controlling organization, comprise that front end is connected with thermometric galvanic couple, the electric rubber cover wire 8 of rear end for being connected with Surveillance center, also comprise that is set up in parallel and runs through the line cylinder 9 being excessively fixed on installation base plate with oxygen supplying tube, crossing line cylinder 9 front ends is positioned at outer tube inside and passes for electric rubber cover wire 8, cross line cylinder 9 rear ends and be provided with external screw thread and spin and be combined with a nut 10, in the middle of nut 10, be provided with via hole, described electric rubber cover wire 8 rear ends pass via hole and and via hole interference fit realize sealing.
Like this, in the time that needs thermometric galvanic couple bounces back, only need unscrew nut, then pull electric rubber cover wire that thermometric galvanic couple is retracted to a segment distance, then mobile nut position on electric rubber cover wire forward, then spins nut to be sealed in line tube rear end again; Like this, galvanic couple self wire is as a part for galvanic couple controlling organization, simple in structure, and can lean on the elasticity of electric rubber cover wire self and the middle via hole of nut to coordinate realization sealing, therefore have simple in structure, easy to operate, can realize sealing and avoid gas leakage to ensure better to send in iron mouth the advantage of oxygen combustion efficiency. Further, electric rubber cover wire outer surface is also provided with graduation mark, can obtain better thermometric galvanic couple and retract distance, and then the convenient oxygen supplying tube of accurately controlling is sent into forward same distance, makes it ensure the accurately inconvenience of burning point position, improves better and burns logical efficiency.
Wherein, the described external screw thread front position of crossing line cylinder 9 rear ends is fixedly welded with a hold-down nut 11. Like this, nut can make its front end and hold-down nut offset spacing and push against and realize lockedly while installation, and simultaneously, in the time of dismounting nut, the convenient spanner that adopts clamps hold-down nut with the application of force, improves dismounting efficiency.
Wherein, on described compressed air hose 4, be also respectively arranged with compressed air control valve 15, compressed-air manometer 16 and compressed air require table 17. Like this, conveniently monitoring and the control to air mass flow.
Wherein, described handling section 1 main body is an oxygen hose, is also respectively arranged with oxygen control valve 12, oxygen gauge 13 and oxygen flowmete 14 on oxygen hose. Like this, conveniently monitoring and the control to oxygen flow.
Said apparatus is specifically used in iron mouth and burns while leading to, can be to use in accordance with the following steps:
A, first obtain said apparatus, handling section rear end is connected with source of oxygen, compressed air hose rear end is connected with compressed air source; Be connected with Surveillance center through electric rubber cover wire rear end;
B, close blast-furnace tuyere ventilate, adopt iron notch drill to drill iron mouth, drilling depth is the optimum 0.5m of being of super tapping hole thickness (iron mouth thickness self is generally 2.5m left and right) 0.3-0.7m(, the too low iron mouth sealing brick that easily burns, cross and deeply can strengthen workload, cause waste);
C, the burning iron mouth section front end of device is inserted into the open front that iron notch drill gets out, to between the iron mouth port of export and the outer tube of burning iron mouth section, adopt hydrous taphole loam shutoff (to avoid follow-up oxygen leakage, improve and burn logical efficiency), pass into the auxiliary iron mouth of oxygen inside by oxygen supplying tube and burn, pneumatically pipe is sent into air oxygen supplying tube is realized to cooling protection; Air capacity and the amount of oxygen sent into are adjusted in control, and the initial stage, while burning iron mouth, air and oxygen proportion were controlled at 6:4, and along with iron mouth flame mechanism, empty oxygen ratio is in the interval adjustment of 6:4～5:5; In this process, according to the displays temperature of thermometric galvanic couple, very fast if temperature raises, can short-term give as security little oxygen flow;
The displays temperature of d, detection thermometric galvanic couple, (cause the temperature of oxygen pipe and outer tube melting when being greater than control temperature, be generally 700 DEG C) time, by galvanic couple controlling organization drive thermometric galvanic couple bounce back a segment distance until thermometric galvanic couple detected temperatures lower than controlling temperature, promote to burn iron mouth section by handling section moves forward and the identical distance of thermometric galvanic couple amount of recovery simultaneously, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logically, burn logical efficiency to improve better;
E, when detect blast-furnace tuyere while having flue gas to emerge, represent to burn logical, now can arresting stop work, extracting apparatus, blast-furnace tuyere resumes operation.
In sum, said apparatus has simple and compact for structure, work smooth and easy stable, and long service life, the advantage such as good reliability, burns logical speed fast, low in the pollution of the environment, can play a key effect for the processing of the special working of a furnaces such as blast furnace banking, gobbed up.
Claims (9)
1. the blast furnace iron mouth of returning to work burns circulation method, comprise and adopt iron notch drill to drill blast furnace taphole and imbed oxygen supplying tube oxygen is sent into the auxiliary internally fired step of iron mouth, it is characterized in that, at oxygen supplying tube front end, thermometric galvanic couple is set, in sending the process of oxygen auxiliary combustion, oxygen supplying tube detects oxygen supplying tube front end temperature, when higher than default control temperature, control thermometric galvanic couple retract a segment distance to detected temperatures lower than default control temperature, control oxygen supplying tube simultaneously and move forward same distance, make oxygen supplying tube front end exit remain in same depth location and realize continuation and burn logical.
Blast furnace as claimed in claim 1 return to work iron mouth burn circulation method, it is characterized in that, adopting following iron notch to burn exchange device realizes, described device comprises and is positioned at the handling section at rear portion and is positioned at anterior burning iron mouth section, in handling section, be provided with air supply channel and for being connected with source of oxygen, burn iron mouth section and comprise that an entirety is the oxygen supplying tube of elongated tubular forward, in oxygen supplying tube rear end and handling section, air supply channel is communicated with setting, and in described burning iron mouth section, oxygen supplying tube outside is also provided with cooling protection structure; Described cooling protection structure; comprise the outer coaxial sheathed outer tube of oxygen supplying tube; outer tube back-end connection is provided with a compressed air hose extending back, and compressed air hose rear end is used for and compressed air source joins and make the space between oxygen supplying tube and outer tube can form cooling-air protective layer.
Blast furnace as claimed in claim 2 return to work iron mouth burn circulation method, it is characterized in that, described oxygen supplying tube front end exceeds outer tube 15-25cm.
Blast furnace as claimed in claim 2 return to work iron mouth burn circulation method, it is characterized in that, described burning iron mouth section also comprises a vertical installation base plate arranging, described outer tube back-end sealing is fixed on installation base plate, described oxygen supplying tube rear end is fixed and is passed installation base plate and is provided with connector in port, rear end and handling section removably connects, outer tube is outwards provided with arm near installation base plate position fixing connection, and arm rear end is provided with connector and compressed air hose removably connects.
Blast furnace as claimed in claim 4 return to work iron mouth burn circulation method, it is characterized in that, also comprise temperature-detecting device, temperature-detecting device comprises and is arranged at outer tube front end near the thermometric galvanic couple between port position and oxygen supplying tube, also comprises the galvanic couple controlling organization that can drive thermometric galvanic couple retraction.
Blast furnace as claimed in claim 5 return to work iron mouth burn circulation method, it is characterized in that, galvanic couple controlling organization, comprise that front end is connected with thermometric galvanic couple, the electric rubber cover wire of rear end for being connected with Surveillance center, also comprise that is set up in parallel and runs through the line cylinder being excessively fixed on installation base plate with oxygen supplying tube, crossing line cylinder front end is positioned at outer tube inside and passes for electric rubber cover wire, crossing line tube rear end is provided with external screw thread and spins and be combined with a nut, in the middle of nut, be provided with via hole, described electric rubber cover wire rear end passes via hole and and via hole interference fit realization sealing.
7. the blast furnace as claimed in claim 6 iron mouth of returning to work burns circulation method, it is characterized in that, the described external screw thread front position of crossing line tube rear end is fixedly welded with a hold-down nut.
Blast furnace as claimed in claim 2 return to work iron mouth burn circulation method, it is characterized in that, on described compressed air hose, be also respectively arranged with compressed air control valve, compressed-air manometer and compressed air require table.
Blast furnace as claimed in claim 1 return to work iron mouth burn circulation method, it is characterized in that, described handling section main body is an oxygen hose, is also respectively arranged with oxygen control valve, oxygen gauge and oxygen flowmete on oxygen hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610120073.3A CN105586458A (en) | 2016-03-03 | 2016-03-03 | Iron notch burn-through method for blast furnace to return to work |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610120073.3A CN105586458A (en) | 2016-03-03 | 2016-03-03 | Iron notch burn-through method for blast furnace to return to work |
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| CN105586458A true CN105586458A (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610120073.3A Pending CN105586458A (en) | 2016-03-03 | 2016-03-03 | Iron notch burn-through method for blast furnace to return to work |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201437541U (en) * | 2009-05-21 | 2010-04-14 | 上海梅山钢铁股份有限公司 | Iron port blow-burning oxygen lance |
| CN202008408U (en) * | 2011-03-04 | 2011-10-12 | 上海梅山钢铁股份有限公司 | Temperature thermocouple of sintering ignition furnace |
| CN203559067U (en) * | 2013-11-26 | 2014-04-23 | 四川省川威集团有限公司 | Oxygen lance |
| CN103757167A (en) * | 2014-01-14 | 2014-04-30 | 攀钢集团成都钢钒有限公司 | Iron notch pretreatment method used during blowing in of blast furnace |
-
2016
- 2016-03-03 CN CN201610120073.3A patent/CN105586458A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201437541U (en) * | 2009-05-21 | 2010-04-14 | 上海梅山钢铁股份有限公司 | Iron port blow-burning oxygen lance |
| CN202008408U (en) * | 2011-03-04 | 2011-10-12 | 上海梅山钢铁股份有限公司 | Temperature thermocouple of sintering ignition furnace |
| CN203559067U (en) * | 2013-11-26 | 2014-04-23 | 四川省川威集团有限公司 | Oxygen lance |
| CN103757167A (en) * | 2014-01-14 | 2014-04-30 | 攀钢集团成都钢钒有限公司 | Iron notch pretreatment method used during blowing in of blast furnace |
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Application publication date: 20160518 |