CN101684512A - Coherent jet oxygen blowing method for electric furnace steel making - Google Patents
Coherent jet oxygen blowing method for electric furnace steel making Download PDFInfo
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- CN101684512A CN101684512A CN200810013371A CN200810013371A CN101684512A CN 101684512 A CN101684512 A CN 101684512A CN 200810013371 A CN200810013371 A CN 200810013371A CN 200810013371 A CN200810013371 A CN 200810013371A CN 101684512 A CN101684512 A CN 101684512A
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Abstract
The invention discloses a coherent jet oxygen blowing method for electric furnace steel making, effectively solving the problem of burner damage in the oxygen blowing process of electric furnace steelmaking and enhancing the stirring to a weld pool through the combination of equipment and process improvement. The coherent jet oxygen blowing method for electric furnace steel making comprises the following step: selecting a coherent jet oxygen blowing device and process conditions, wherein the device consists of a primary oxygen spraying and blowing system, a secondary oxygen spraying and blowing system and a fuel gas spraying and blowing system. A primary oxygen spraying hole has a pressure regulation range of 0.8-1.2MPa and an oxygen flow range of 10,000-60,000Nm<3>/h; a secondary oxygenspraying hole has a pressure regulation range of 0.12-0.8MPa and an oxygen flow range of 2,000-10,000Nm<3>/h; and a fuel gas spraying hole has a pressure regulation range of 0.12-0.2MPa, an outlet Mach number of 0.5-1.0 and a fuel gas flow range of 100-2000Nm<3>/h. The invention not only solves the problem of burner damage, but also has important meaning for improving the adaptability of waste steel quality and the internal quality of steel products.
Description
Technical field
The present invention relates to the steelmaking oxygen blowing method, especially a kind of polymerization jet oxygen blowing method that is applied to Electric furnace steel making.
Background technology
Electric furnace steel making is to insert the iron pipe oxygen blast based on fire door at present, and oxygen supply intensity is low, and labor strength is big.Through improving, the oxygen rifle burns to be chewed and can be installed on the furnace wall, but because burning is chewed the flame weak point, and the position of installation is low, metal and slag can splash to burn and chew during blowing.In the process of making foamed slag, slag also can rise to the height that is enough to pour into burner, and it is impaired that burning is chewed.Existing in addition oxygen blast of electric furnace mode is relatively poor to the mixing effect in molten bath, influences the cost and the steel product quality of Electric furnace steel making.
About the Electric Furnace Steelmaking progress, existing patent documentation report.As open (bulletin) number: CN1775959, title: a kind of electric furnace to converter steel making production process; Open (bulletin) number: CN1598000, title: a kind of electric arc furnace converter steel making production process, these two pieces of documents have been paid attention to the change on the electric furnace to converter metallization processes, and production cost is suitable with the converter steel production cost, has reduced flue gas and has emitted outward, has improved operating environment.But there is not to solve on the slave unit oxygen blast problem of Electric furnace steel making.Open (bulletin) number: CN2673879, name is called the patent documentation of a kind of novel smelting steel in ultrahigh-power electric furnace with the furnace wall carbonyl spray gun, this furnace wall carbon-oxygen gun includes cluster oxygen ejection gun and carbon jetting gun, boundling is penetrated oxygen and is included supersonic speed oxygen jet and circulation oxygen nozzle, and cluster oxygen ejection gun and carbon jetting gun all are contained in the water-cooling copper box.The main oxygen stream of cluster oxygen ejection gun nozzle center points to the molten bath, adds around the main oxygen stream around gas-flow or epoxy stream main oxygen has been flowed the big envelope provide protection, makes main oxygen stream keep the boundling state on long distance, thereby possesses powerful penetrativity.The structure that the document has only been introduced the furnace wall carbon-oxygen gun does not relate to concrete using method.In addition, also more complicated of the structure of furnace wall carbonyl spray gun.
Summary of the invention
The invention provides a kind of coherent jet oxygen blowing method for electric furnace steel making, improve combining by equipment and technology, solved effectively to burn in the oxygen blast process of Electric furnace steel making and chewed impaired problem, and strengthened stirring the molten bath.
Coherent jet oxygen blowing method for electric furnace steel making provided by the invention comprises following content:
A. selective polymerization jet oxygen blowing device
With burning chew, the function of oxygen rifle and after burner three parts is integrated in one, and forms a polymerization jet oxygen blowing device, this device is made up of main oxygen injection system, secondary oxygen injection system, combustion gas injection system three parts.Main oxygen injection system is positioned at the central position of polymerization jet oxygen blowing device; The combustion gas injection system is located at the skin of main oxygen injection system; Secondary oxygen injection system is positioned at combustion gas injection system skin.The nozzle structure of polymerization jet oxygen blowing device is by a main oxygen jet orifice, and 16 fuel gas holes and 16 assistant oxygen jet orifices constitute.Gas jet orifice becomes 11.25 ° to be crisscross arranged, to export on the same circumference that is distributed in end face with assistant oxygen jet orifice by circumferential direction.Gas jet orifice and assistant oxygen jet orifice are straight hole, and main oxygen jet pipe is the Laval jet pipe.
B. polymerization jet oxygen blowing processing condition
Main oxygen jet orifice pressure regulation range is 0.8～1.2MPa, outlet Mach 2 ship 1.99～2.2, and the oxygen flow scope is 10000-60000Nm
3/ h, assistant oxygen jet orifice pressure regulation range is 0.12～0.8MPa, the oxygen flow scope is 2000-10000Nm
3/ h, outlet Mach 2 ship 0.5～1.0, the 4-10 that main oxygen effusive flow is outer secondary oxygen flow are doubly; Gas jet orifice pressure regulation range is 0.12～0.2MPa, outlet Mach 2 ship 0.5～1.0, and the gas flow scope is 100-2000Nm
3/ h.
Coherent jet oxygen blowing method for electric furnace steel making may further comprise the steps: at first open the gas jet orifice valve, regulate fuel gas inlet pressure to 0.12MPa, regulate gas flow in above-mentioned scope; Open the assistant oxygen jet orifice valve again, oxygen pressure is by the little 0.8MPa that increases to gradually; Open the main oxygen jet orifice valve at last, in above-mentioned scope, regulate main oxygen pressure and main oxygen effusive oxygen flow, and gaseous-pressure is increased to 0.2MPa gradually by 0.12MPa.
This oxygen blowing device accelerates to supersonic speed with primary oxygen jets; high-speed jet comes out to be used to electrosmelting from this oxygen blowing device under the protection of its combustion gas cover of a complete encirclement; this combustion gas cover is the high-temperature low-density hot gas; the high-speed jet at center and the speed of relative movement between the hot gas jet and momentum exchange are farthest reduced, transport of kinetic energy such as be similar to.Promptly on same spray gun height, its surging force is more much bigger than conventional jet, like this, can avoid it to be involved in surrounding gas prematurely as conventional jet and causes rapid decay.
Coherent jet oxygen blowing method for electric furnace steel making provided by the invention is compared with existing Electric furnace steel making oxygen blowing method, and its significant beneficial effect is:
Adopt polymerization fluidics to be applied to electrosmelting, burner, oxygen rifle and after burner three partial functions are integrated in one, reduce the electric furnace auxiliary facility, do not need any rifle shift-in or shift out in the stove, adopt polymerization jet oxygen blowing device, the Oxygen Flow of generation and flame can keep the distance grown, shower nozzle can be installed in top, furnace wall, not only solve to burn and chew the damage problem, and supersonic speed polymerization jet promotes reaction between carbon and oxygen, and utilized its kinetic energy and chemical energy.Particularly staying steel, staying under the situation of slag or hot metal charge, can promote to carry out as early as possible the oxygen enrichment operation and strengthen the molten bath stirring, thereby shorten the heat, enhance productivity, reduce power consumption, obtain satisfied decarburization and intensification effect, be particularly useful for adding molten iron or pig iron ratio is higher, or the situation of smelting low carbon kind.Because the effect of polymerization effusive violent stirring, greatly improved the dynamic conditions of dephosphorisation reaction in early days in oxidation, strengthened dephosphorization effect.The present invention all is of great importance to the internal soundness that improves adaptability of waste steel quality, raising steel product.
Description of drawings
Fig. 1 is the front view synoptic diagram of polymerization jet oxygen blowing device, and Fig. 2 is a polymerization jet oxygen blowing device left view synoptic diagram.
Embodiment
Coherent jet oxygen blowing method for electric furnace steel making, comprise selective polymerization jet oxygen blowing device and polymerization jet oxygen blowing processing condition, as shown in Figure 1 and Figure 2, polymerization jet oxygen blowing device is made up of main oxygen injection system 1, secondary oxygen injection system 3, combustion gas injection system 2 three parts.Main oxygen injection system is positioned at the central position of polymerization jet oxygen blowing device; The combustion gas injection system is located at the skin of main oxygen injection system; Secondary oxygen injection system is positioned at combustion gas injection system skin.The nozzle structure of polymerization jet oxygen blowing device is made of 4, ten six gas jet orifices 5 of a main oxygen jet orifice and 16 assistant oxygen jet orifices 6.Gas jet orifice becomes 11.25 ° to be crisscross arranged, to export on the same circumference that is distributed in end face with assistant oxygen jet orifice by circumferential direction.Gas jet orifice and assistant oxygen jet orifice are straight hole, and main oxygen jet pipe is the Laval jet pipe.
The processing condition of coherent jet oxygen blowing method for electric furnace steel making and step: at first open gas jet orifice 5 valves, regulating fuel gas inlet pressure is 0.12MPa, and flow range is 150-500Nm
3/ h. opens assistant oxygen jet orifice 6 valves again, and oxygen pressure is by the little 0.8MPa that increases to gradually, and flow range is 2000-8000Nm
3/ h opens main oxygen jet orifice 4 valves at last, and pressure is set is 0.8MPa, and flow range is 20000-40000Nm
3/ h.And gaseous-pressure is increased to 0.2MPa gradually by 0.12MPa.
Electric-arc furnace steelmaking adopts the polymerization jet oxygen blowing method, and after steel scrap was packed into, injector just entered the burner pattern and begins with burner flame heating steel scrap and help fusing.Use very hot oven during preheating scrap in beginning, use penetrance flame during to the scrap melting in later stage.In case scrap melting just is converted to oxygen rifle pattern, carries out decarburizing reaction, on some points of this mode process, the secondary combustion reaction also takes place immediately, and can regulate jet length according to practical situation simultaneously.
Claims (1)
1. coherent jet oxygen blowing method for electric furnace steel making is characterized in that this method comprises following content:
A. selective polymerization jet oxygen blowing device
Polymerization jet oxygen blowing device is made up of main oxygen injection system, secondary oxygen injection system, combustion gas injection system three parts, and main oxygen injection system is positioned at the central position of polymerization jet oxygen blowing device; The combustion gas injection system is located at the skin of main oxygen injection system; Secondary oxygen injection system is positioned at combustion gas injection system skin, the nozzle structure of polymerization jet oxygen blowing device is by a main oxygen jet orifice, 16 fuel gas holes and 16 assistant oxygen jet orifices constitute, gas jet orifice becomes 11.25 ° to be crisscross arranged, to export on the same circumference that is distributed in end face with assistant oxygen jet orifice by circumferential direction, gas jet orifice and assistant oxygen jet orifice are straight hole, and main oxygen jet pipe is the Laval jet pipe;
B. polymerization jet oxygen blowing processing condition
Main oxygen jet orifice pressure regulation range is 0.8～1.2MPa, outlet Mach 2 ship 1.99～2.2, and the oxygen flow scope is 10000-60000Nm
3/ h, assistant oxygen jet orifice pressure regulation range is 0.12～0.8MPa, the oxygen flow scope is 2000-10000Nm
3/ h, outlet Mach 2 ship 0.5～1.0; The 4-10 that main oxygen effusive flow is outer secondary oxygen flow times, gas jet orifice pressure regulation range is 0.12～0.2MPa, outlet Mach 2 ship 0.5～1.0, and the gas flow scope is 100-2000Nm
3/ h;
Coherent jet oxygen blowing method for electric furnace steel making may further comprise the steps: at first open the gas jet orifice valve, regulate fuel gas inlet pressure to 0.12MPa, in above-mentioned scope, regulate gas flow, open the assistant oxygen jet orifice valve again, oxygen pressure is by the little 0.8MPa that increases to gradually, open the main oxygen jet orifice valve at last, in above-mentioned scope, regulate main oxygen pressure and main oxygen effusive oxygen flow, and gaseous-pressure is increased to 0.2MPa gradually by 0.12MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810013371A CN101684512A (en) | 2008-09-26 | 2008-09-26 | Coherent jet oxygen blowing method for electric furnace steel making |
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| CN200810013371A CN101684512A (en) | 2008-09-26 | 2008-09-26 | Coherent jet oxygen blowing method for electric furnace steel making |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256107A (en) * | 2015-11-26 | 2016-01-20 | 中冶赛迪工程技术股份有限公司 | Ring groove coherent jet nozzle structure |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN105420452A (en) * | 2015-12-24 | 2016-03-23 | 中冶赛迪工程技术股份有限公司 | Supersonic nozzle preventing from slag entrapment |
| CN105950824A (en) * | 2016-06-06 | 2016-09-21 | 中冶赛迪工程技术股份有限公司 | Electric arc furnace steelmaking process with oxygen, fuel and powder common injection |
| CN108642238A (en) * | 2018-06-04 | 2018-10-12 | 北京科技大学 | A kind of steel-making super burn surpasses cluster fluidic jet pipe and its super cluster fluidic method of super burn |
| CN109355457A (en) * | 2018-11-26 | 2019-02-19 | 江苏必瑞驰科技有限公司 | A kind of application of porous oxygen lance |
| CN109609717A (en) * | 2018-11-26 | 2019-04-12 | 江苏必瑞驰科技有限公司 | A kind of converter steel-smelting technique using porous oxygen lance |
| CN109628689A (en) * | 2019-02-27 | 2019-04-16 | 中冶赛迪工程技术股份有限公司 | High hot metal ratio electric furnace method for supplying oxygen |
| CN110257576A (en) * | 2019-07-18 | 2019-09-20 | 辽宁科技大学 | A kind of reducing is synchronous to couple Blast Furnace Injection device and blowing method |
| CN114406470A (en) * | 2022-01-26 | 2022-04-29 | 中国航空制造技术研究院 | Double-beam laser welding method for exhaust pipe cylinder and flange |
-
2008
- 2008-09-26 CN CN200810013371A patent/CN101684512A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256107A (en) * | 2015-11-26 | 2016-01-20 | 中冶赛迪工程技术股份有限公司 | Ring groove coherent jet nozzle structure |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN105256107B (en) * | 2015-11-26 | 2017-12-29 | 中冶赛迪工程技术股份有限公司 | A kind of annular groove cluster fluidic nozzle structure |
| CN105420452A (en) * | 2015-12-24 | 2016-03-23 | 中冶赛迪工程技术股份有限公司 | Supersonic nozzle preventing from slag entrapment |
| CN105950824A (en) * | 2016-06-06 | 2016-09-21 | 中冶赛迪工程技术股份有限公司 | Electric arc furnace steelmaking process with oxygen, fuel and powder common injection |
| CN108642238A (en) * | 2018-06-04 | 2018-10-12 | 北京科技大学 | A kind of steel-making super burn surpasses cluster fluidic jet pipe and its super cluster fluidic method of super burn |
| CN109355457A (en) * | 2018-11-26 | 2019-02-19 | 江苏必瑞驰科技有限公司 | A kind of application of porous oxygen lance |
| CN109609717A (en) * | 2018-11-26 | 2019-04-12 | 江苏必瑞驰科技有限公司 | A kind of converter steel-smelting technique using porous oxygen lance |
| CN109628689A (en) * | 2019-02-27 | 2019-04-16 | 中冶赛迪工程技术股份有限公司 | High hot metal ratio electric furnace method for supplying oxygen |
| CN109628689B (en) * | 2019-02-27 | 2020-12-04 | 中冶赛迪工程技术股份有限公司 | Oxygen supply method for electric furnace with high molten iron ratio |
| CN110257576A (en) * | 2019-07-18 | 2019-09-20 | 辽宁科技大学 | A kind of reducing is synchronous to couple Blast Furnace Injection device and blowing method |
| CN110257576B (en) * | 2019-07-18 | 2024-02-20 | 辽宁科技大学 | Reducing synchronous coupling blast furnace tuyere injection device and injection method |
| CN114406470A (en) * | 2022-01-26 | 2022-04-29 | 中国航空制造技术研究院 | Double-beam laser welding method for exhaust pipe cylinder and flange |
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Open date: 20100331 |