CN1056887C - Control method of oxygen concentration for vertical quick melting furnace - Google Patents
Control method of oxygen concentration for vertical quick melting furnace Download PDFInfo
- Publication number
- CN1056887C CN1056887C CN96122001A CN96122001A CN1056887C CN 1056887 C CN1056887 C CN 1056887C CN 96122001 A CN96122001 A CN 96122001A CN 96122001 A CN96122001 A CN 96122001A CN 1056887 C CN1056887 C CN 1056887C
- Authority
- CN
- China
- Prior art keywords
- oxygen
- oxygen concentration
- temperature
- molten iron
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 66
- 239000001301 oxygen Substances 0.000 title claims abstract description 66
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000002844 melting Methods 0.000 title claims abstract description 30
- 230000008018 melting Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000010079 rubber tapping Methods 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 110
- 229910052742 iron Inorganic materials 0.000 claims description 55
- 239000000571 coke Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 150000002926 oxygen Chemical class 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 12
- 238000003723 Smelting Methods 0.000 description 6
- 239000003610 charcoal Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- -1 this Chemical compound 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
- F27D21/0014—Devices for monitoring temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
- F27D2019/0043—Amount of air or O2 to the burner
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Incineration Of Waste (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
To keep a molten metal temp. to a fixed value by calculating enriching quantity of necessary pure oxygen based on molten metal tapping temp., controlling the oxygen concn. in a specific range and supplying to a tuyere of a furnace body. An air flow rate control valve 7 and an oxygen flow rate control valve 7 are controlled with a program controller 10 to adjust the air quantity and the oxygen quantity into a vertical type melting furnace 1. The molten metal in the melting furnace 1 is tapped from a siphon part 16. The molten metal tapping temp. is continuously measured at the siphon part 16 with a molten metal temp. measuring instrument 17 and transported to the controller 10. A theoretical oxygen quantity needed to combustion is calculated in the range of 1-20% of the enriching rate and the opening degree of the oxygen flow rate control valve 12 is adjusted through the controller 10 to supply the oxygen from an oxygen tank 11. The oxygen is mixed with the air and supplied into the melting furnace 1 from the tuyere 2. Since the optimized oxygen enriched quantity is supplied, the operational cost can be reduced. Since the response time to the oxygen enriched quantity is quickened such as five min., the quantity control is facilitated. Further, since the stable melting at high temp. can be executed, component control is facilitated.
Description
The present invention relates to the control method of vertical quick melting furnace oxygen concentration, with the coke be fuel in vertical quick melting furnaces such as iron furnace, fixedly be sent to the total oxygen tolerance of the intravital wind of this stove on the one hand, make it corresponding with coke ratio, on the other hand, by in 1% and even 20% scope, changing the airborne purity oxygen enriching quantity (enrichment amount-original text) that is sent to this body of heater arbitrarily, make it can control molten iron temperature and change.
Generally speaking, the metal charge of using for continuous melting cast iron (metal ground gold-original text), adopt vertical melting furnaces such as coke cupola furnace mostly, so in the process of handling this cupola furnace, freely control the operation of molten iron temperature according to the characteristic of wanting the molten metal furnace charge, need quite high knack on the one hand, can not control molten iron temperature effectively on the other hand.
And, in handling existing cupola furnace process,, change molten iron temperature by increase and decrease coke ratio or increase and decrease blast volume as the method for control molten iron temperature.This coke ratio is meant the coke charge charcoal with respect to the weight ratio that drops into furnace charge, and this blast volume is sent into from the air port via bellows.
But, change in the method for molten iron temperature at these, for the former method that the increase and decrease coke is recently controlled molten iron temperature of passing through, be pack on the top of bed coke coke charge charcoal and melting batch, like this from the furnace charge of packing into of bottom, fusing, furnace charge after the increase and decrease coke ratio is melted until flowing out molten iron, though because of the difference of the melting capacity of stove has very big-difference, but want the time in 30 minutes evenings and even 1 hour generally speaking, and reasons such as variation have also taken place owing to the amount of tapping a blast furnace, properties of molten also lacks homogeneity, is extremely difficult to the control of the target value of molten iron temperature.
In addition, thereby method for the blast volume control molten iron temperature in the latter's increase and decrease Lai Chu air port, though the increase and decrease control to blast volume can only just can realize by the control to gas blower machinery at an easy rate, but increase along with blast volume, quickened on the one hand in the stove burning, increased the amount of tapping a blast furnace, on the other hand, there are danger such as molten iron temperature reduction, thereby can not carry out temperature control effectively.
It must be very difficult with the method for these existing control molten iron temperatures the molten iron temperature being kept, and the material structural constituent of molten iron changes easily, is difficult to carry out Composition Control, finally becomes in the goods control one of inconsistent reason of quality product to occur.And during operation stove fire or blowing out after fire and need the time, so with i.e. can not carry out smoothly being connected of operation of later process to the mold cast.Can not be approaching when existing in body of heater in addition and urgent abnormal conditions occurring etc. the various problems that should solve, and wish to carry out the stable control of molten iron temperature.
The problem that the present invention will solve is in view of present situation as mentioned above and propose, its purpose will make vertical quick melting furnaces such as coke cupola furnace exactly, according to the characteristic of wanting the molten metal furnace charge can be with the relatively short time of response, control molten iron temperature easily, make the material structural constituent under the high temperature with low uncertainty, be easy to carry out Composition Control, make it by such stably fused with by control, finally reduce the fraction defective of cast product the molten iron temperature of each cast product.
The present invention is the purpose that reaches such, for making the coke charge charcoal burning of input, by essential theoretical burns oxygen tolerance decision blast volume, this blast volume is the air port that feeds to the coke the vertical rapid iron furnaces such as cupola furnace that are fuel, so fix this theory amount of oxygen on the one hand, the certain purity oxygen of enrichment in this air blast air makes the furnace high-temperature burning by changing the airborne oxygen degree of this air blast on the other hand, make it under the certain situation of the amount of tapping a blast furnace, can change molten iron temperature.
The present invention is to be in the vertical rapid iron furnaces such as cupola furnace of fuel with the coke, for making the coke charge charcoal burning of input, feed to the blast volume in the air port of this body of heater by essential theoretical burns oxygen tolerance decision, so on the one hand at this theory amount of oxygen, by in 1% and even 20% scope, at random change the airborne purity oxygen enriching quantity of air blast that feeds to this body of heater, carrying out enrichment makes it can control the variation of molten iron temperature under the certain situation of the amount of tapping a blast furnace, on the other hand, suppose that molten iron temperature is certain, making iron ability can be increased to 2～3 times of basic capacity.
By the way, the present invention will be delivered to the smelting zone of the positive upper part of molten iron retention layer that is positioned at furnace bottom from the air port with the air blast air after the pure oxygen enrichment in 1% to 20% scope, so that stove internal combustion, owing at this smelting zone combustion reactions rapidly takes place, the temperature of combustion in the stove reaches 2100 ℃ to 2400 ℃.At the ultrahigh-temperature and the carbonic acid gas of the generation of the right in air port, violent thermo-negative reaction takes place in the coke with the top, air port at once, generates the strongly reducing atmosphere of carbon monoxide like this, makes it to become smelting zone smelting furnace very narrow, that the high temperature melting layer constitutes.Therefore make reaction heat directly contact, can realize high temperature melting rapidly with the High Temperature Gas physical efficiency.
Peculiar effect of the present invention is listed below:
1. by oxygen concentration, can making iron ability fade to 2～3 times of basic capacity, so obtain the balance with moulding line easily.
2. owing to automatically control optimal oxygen concentration amount, can reduce the running cost of body of heater.
With the corresponding time of response of oxygen concentration amount in 5 minutes, can very rapidly respond, so very convenient aspect quality control.
4. because molten iron temperature is consistent, so improved the quality of molten iron.
5. when firing (igniting) or unusual phenomenon etc. occurring, the lift velocity of molten iron temperature is fast, good operability.
6. because can at high temperature stably change iron, so the moiety of material is with low uncertainty, Composition Control is easier to.
7. because can carry out the control of molten iron temperature, so the fraction defective of goods has reduced to each cast product.
By automatically with the throwing device interlock of molten material, can realize the full-automation of melting systems, so that obtain operating efficiency never before seen.
Fig. 1 is a general flowchart of the present invention.
The general flowchart that following foundation is appended describes embodiments of the invention.The present invention is provided with supply-pipe 4, supply-pipe 4 supplies to a plurality of air ports 2 that are arranged at body of heater 1 bottom respectively with the air blast air from bellows 3, on blast pipe 6 from gas blower 5 to setting these bellows 3, be provided with the flow measurement hole 9 of measuring air flow quantity, this flow measurement hole 9 connects air flow rate adjustment valve 7 and pressure difference signal sends device 8, and be connected, so that its flow measurement hole 9 that can carry out teletype control air flow valve 7 and measure air flow quantity with programmable logic controller 10.In addition, to being connected by the oxygen concentration supply-pipe 15 that is provided with the flow measurement hole 14 of measuring oxygen flow the blast pipe 6, this flow measurement hole 14 connects oxygen flow variable valve 12 and pressure difference signal sends device 13 from storage oxygen case 11; And be connected, so that its flow measurement hole 14 that can carry out teletype control oxygen flow variable valve 12 and measure oxygen flow with programmable logic controller 10.
In addition, be provided with the storage metal trough 16 that holds from body of heater 1 effusive molten iron, and it can be store on the metal trough 16 by being arranged at, the molten iron temperature time meter 17 that can carry out continuously measured is input to above-mentioned programmable logic controller 10 with temperature-measuring results, this programmable logic controller 10 makes calculation result enter throwing device 18 by other approach, this throwing device 18 after measuring melting batch etc. and coke with the material loading port of its body of heater 1 of packing into, and numeral indication accommodometer 19 is connected with programmable logic controller 10, coke ratio in these numeral indication accommodometer 19 input bodies of heater 1, all multidata such as the amount of tapping a blast furnace and molten iron temperature, 20 is pressure warning units among the figure, the 21st, check valve, the 22nd, strainer, the 23rd, switch-valve.
The present invention is according to the characteristic of the furnace charge that will melt in the body of heater 1, with coke ratio, the amount of tapping a blast furnace and molten iron temperature all multidata such as (design temperatures) are input to numeral indication accommodometer 19, calculate the necessary theoretical amount of oxygen of this coke of burning according to these data by programmable logic controller 10, according to this calculation result, with measuring the air blast air capacity of blast pipes 6 with the flow measurement hole 9 that pressure difference signal sends the measurement air flow quantity that device 8 links to each other, and control with air flow rate adjustment valve 7, it is supplied to bellows 3, simultaneously, according to the molten iron temperature of setting, calculate necessary 1% to 20% suitable purity oxygen enriching quantity, this oxygen concentration amount is by measuring with the flow measurement hole 14 that pressure difference signal sends the measurement oxygen flow that device 13 links to each other, by 12 controls of oxygen flow variable valve, essential amount of oxygen is supplied to blast pipe 6 by oxygen concentration supply-pipe 15 from storage oxygen case 11, change oxygen concentration, supply to air port 2 from bellows 3 as the air blast air.
In view of the above, high-temp combustion in the body of heater 1, make the melting batch high temperature melting of smelting zone, molten iron flows into the storage metal trough 16 of body of heater 1, but the tester 17 by the molten iron temperature of this storage metal trough 16 of continuously measured feeds back to temperature-measuring results the programmable logic controller 10 that calculates above-mentioned melting condition, temperature head according to molten iron temperature and design temperature is calculated the oxygen concentration amount, with above-mentioned similarly by measuring the oxygen concentration amount of revising of replenishing with the flow measurement hole 14 that pressure difference signal sends the measurement oxygen flow that device 13 links to each other, make oxygen flow variable valve 12 interlocks by programmable logic controller 10, essential amount of oxygen is supplied to blast pipe 6 from oxygen concentration supply-pipe 15, revise at design temperature, so make it pass through other approach and throwing device 18 interlocks as required, this throwing device 18 after metering smelting iron furnace charge etc. with the material loading port of its body of heater 1 of packing into, thereby keep the molten iron temperature of setting, can guarantee certain amount of tapping a blast furnace, in addition, also can making iron ability increase to 2～3 times of basic capacity.
As mentioned above, the present invention is in order to make the coke burning of input, the blast volume in air port of vertical quick melting furnace in the cupola furnace etc. that is fuel will be sent to the coke, according to essential theoretical burns oxygen tolerance, the certain pure oxygen tolerance of enrichment in this air blast air if change the airborne oxygen concentration of this air blast, then can change molten iron temperature under the certain situation of the amount of tapping a blast furnace, in addition if the hypothesis molten iron temperature be necessarily, then also can making iron ability fade to 2～3 times of basic capacity.
The present invention changes arbitrarily the airborne purity oxygen enriching quantity of air blast that is sent to the body of heater air port in 1% to 20% scope, make its enrichment, and by with the throwing device interlock of melting batch, can make melting capacity increase to 2～3 times of basic capacity.According to inventors' experimental result as can be known:
In basic capacity is in the actual stove of 2T/hr, if the material input amount is: 250kg/ time, coke ratio: 14%, at melting batch be: scrap iron: the new pig iron 33%: foundry return 14%: steel cuttings 33%: under 20% the situation, the work data of the amount of tapping a blast furnace and oxygen concentration amount is listed in the table below:
The relation of the amount of tapping a blast furnace and oxygen concentration amount
| The amount of tapping a blast furnace | 2T/hr | 2.5 | 3.0 | 3.5 | 4.0 |
| Air blast air capacity (M 3/ minute) | 30 | 30 | 30 | 30 | 30 |
| Oxygen concentration amount (M 3/ time) | 0 | 82 | 146 | 216 | 288 |
Shown in above-mentioned work data like that, do not change the air blast air capacity and only increase amount of oxygen and just can increase and iron water amount.
Claims (3)
1. the control method of the oxygen concentration of a vertical quick melting furnace, it is characterized in that: according to the characteristic of wanting the molten metal furnace charge in the body of heater, with coke ratio, go out all data such as iron water amount and molten iron temperature and be input to numeral indication accommodometer, calculate the necessary theoretical amount of oxygen of this coke of burning according to these data by programmable logic controller, be sent to the air blast air capacity of blast pipe according to this calculation result control, to supply to bellows, simultaneously calculate necessary 1% and even 20% suitable purity oxygen enriching quantity according to the molten iron temperature of setting that goes out, control this oxygen concentration amount and supply to blast pipe, be re-supplied to the air port of body of heater after the change oxygen concentration from the oxygen concentration supply-pipe.
2. the control method of the oxygen concentration of vertical quick melting furnace as claimed in claim 1, it is characterized in that: in body of heater high-temp combustion and the molten iron that melted flows into the storage metal trough, the molten iron temperature tester is arranged on this storage metal trough, to feed back to the programmable logic controller that calculates melting condition from the temperature-measuring results of molten iron temperature tester, temperature head according to molten iron temperature and design temperature is calculated the oxygen concentration amount, by the flow of Controlled by Programmable Controller from the oxygen of storage oxygen case, supply to blast pipe with replenishing the oxygen concentration amount of revising from the oxygen concentration supply-pipe is additional, molten iron temperature is adapted to design temperature.
3. the control method of the oxygen concentration of vertical quick melting furnace as claimed in claim 2, it is characterized in that: in by programmable logic controller correction tapping temperature, after the metering coke ratio, make charging device company fortune with the material loading port of the bodies of heater of packing into such as melting batch, with the amount of necessity of the melting batch of packing into etc., thereby keep high tapping temperature.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP317614/1995 | 1995-10-30 | ||
| JP7317615A JPH09125123A (en) | 1995-10-30 | 1995-10-30 | Method for charging material corresponding to melting capacity in vertical type quick melting furnace |
| JP317615/1995 | 1995-10-30 | ||
| JP317614/95 | 1995-10-30 | ||
| JP317615/95 | 1995-10-30 | ||
| JP7317614A JPH09125122A (en) | 1995-10-30 | 1995-10-30 | Method for controlling oxygen concentration corresponding to molten metal tapping temperature in vertical type quick melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1150604A CN1150604A (en) | 1997-05-28 |
| CN1056887C true CN1056887C (en) | 2000-09-27 |
Family
ID=26569072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96122001A Expired - Fee Related CN1056887C (en) | 1995-10-30 | 1996-10-22 | Control method of oxygen concentration for vertical quick melting furnace |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR970021915A (en) |
| CN (1) | CN1056887C (en) |
| MY (1) | MY132259A (en) |
| TW (1) | TW320652B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100502236B1 (en) * | 2000-09-09 | 2005-07-20 | 주식회사 포스코 | Device for controling amount of oxigen of coke oven |
| CN102676840A (en) * | 2011-03-10 | 2012-09-19 | 中国恩菲工程技术有限公司 | Method for controlling start of smelting |
| CN102799156A (en) * | 2012-07-27 | 2012-11-28 | 江苏永钢集团有限公司 | Remote control system of oxygen enrichment station |
-
1996
- 1996-09-07 TW TW085110954A patent/TW320652B/zh active
- 1996-10-18 KR KR1019960047388A patent/KR970021915A/en not_active Abandoned
- 1996-10-18 MY MYPI96004341A patent/MY132259A/en unknown
- 1996-10-22 CN CN96122001A patent/CN1056887C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| MY132259A (en) | 2007-09-28 |
| CN1150604A (en) | 1997-05-28 |
| TW320652B (en) | 1997-11-21 |
| KR970021915A (en) | 1997-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4657586A (en) | Submerged combustion in molten materials | |
| CN111705176B (en) | Method for discharging slag iron by using oxygen lance during blow-in of blast furnace and oxygen lance thereof | |
| CN109321699B (en) | Method for burning dead coke pile in tuyere area without discharging residual iron during shutdown of blast furnace empty material line | |
| US5660542A (en) | Cupola burner | |
| CN1056887C (en) | Control method of oxygen concentration for vertical quick melting furnace | |
| SK147397A3 (en) | Process for melting of metal materials in a shaft furnace | |
| EP0134857A1 (en) | Method for the fabrication of special steels in metallurgical vessels | |
| CN106524761B (en) | Ferroalloy heating furnace and ferroalloy feeding mechanism | |
| JPH10310808A (en) | Blast furnace operation method | |
| US6129776A (en) | Operation method of vertical furnace | |
| AU724385B2 (en) | Method for controlling a smelting reduction process | |
| CN107460340A (en) | A kind of quick blow-in method of copper bottom-blown smelting stove | |
| CN105506210A (en) | Vertical gas furnace and melting method for fusing and reducing metal material | |
| CN117167772A (en) | A dynamic oxygen-enriched combustion mixed iron furnace gas baking method | |
| RU2164242C2 (en) | Method of blast-furnace blowing-in | |
| RU2118989C1 (en) | Cast iron smelting process | |
| JPH09125122A (en) | Method for controlling oxygen concentration corresponding to molten metal tapping temperature in vertical type quick melting furnace | |
| US3212879A (en) | Process and apparatus for controlling shaft furnaces | |
| EP3642369B1 (en) | Shaft furnace and injection of oxidizing agent therein | |
| US3193379A (en) | Method of operating a blast furnace | |
| JPH09133352A (en) | Variable capacity vertical rapid melting furnace | |
| JPH09125123A (en) | Method for charging material corresponding to melting capacity in vertical type quick melting furnace | |
| US3088821A (en) | Open hearth steelmaking process | |
| WO2025245069A1 (en) | Secondary oxygen injection system, cupola furnace, and methods of operation | |
| JPH01318883A (en) | Operation of vertical furnace and equipment thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |