CN207031484U - A kind of purifying quick smelting device system of full steel scrap electric arc furnaces - Google Patents
A kind of purifying quick smelting device system of full steel scrap electric arc furnaces Download PDFInfo
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- CN207031484U CN207031484U CN201720994090.XU CN201720994090U CN207031484U CN 207031484 U CN207031484 U CN 207031484U CN 201720994090 U CN201720994090 U CN 201720994090U CN 207031484 U CN207031484 U CN 207031484U
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- carrier gas
- steel scrap
- electric arc
- carburetting
- dephosphorization
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The utility model belongs to EAF steelmaking technology field, more particularly to a kind of purifying quick smelting device system of full steel scrap electric arc furnaces, suitable for the full steel scrap arc furnace smelting procedures of 30~300t.According to full steel scrap electric arc furnace smelting process, variety classes medium is blown in the different smelting stages using the spray gun being embedded in inside arc furnace bottom side refractory material, the carburetting fluxing stage accelerates melting down, raising molten bath carbon content using bath carburetion；High efficiency dephosphorating and depth denitrification stage, strengthen melt tank reaction high efficiency dephosphorating, advanced nitrogen, so as to accelerate full steel scrap electric arc furnace smelting rhythm, improve dephosphorization, denitrification effect, improve Cleanliness of Molten Steel, realize the purifying quick smelting of full steel scrap electric arc furnaces.
Description
Technical field
The utility model belongs to EAF steelmaking technology field, a kind of more particularly to purifying quick smelting of full steel scrap electric arc furnaces
Refine device.
Background technology
Electric arc furnaces using full steel scrap burden structure smelt when, initial smelting period with electric energy input based on, chemical energy input supplemented by,
But high-power inputing power and chemical energy are relied on merely, its energy utilization efficiency is limited；In addition, the mistake that the scrap melting stage is formed
Journey molten bath is sticky, poor fluidity, is unfavorable for accelerating scrap melting.Therefore, when melting down during the full steel scrap of actual arc stove smelting
Between it is longer, greatly reduce electric arc furnace smelting rhythm.
On the other hand, quality of molten steel control is always the technical barrier that full steel scrap electric arc furnace smelting faces for a long time, main to collect
In in terms of terminal molten steel phosphorus content and Control of Nitrogen Content.
In terms of dephosphorization：When electric-arc furnace steelmaking uses full steel scrap burden structure, steel scrap source is complicated, melting down phosphorus content fluctuation
Greatly；Bath temperature is higher, carbon content is low after melting down, molten steel viscosity is high, and molten bath flowing velocity is slow, dephosphorization dynamic conditions
Difference, smelting process dephosphorization are difficult.Conventional arc stove smelts the multiple slag making of generally use, flow slag operation, cause smelting cycle to extend,
The quantity of slag is big, molten steel peroxidating is serious.
In terms of denitrogenation：While full steel scrap electric arc furnaces strengthens scrap melting using high-power power supply, electrode discharge produces
High-temperature electric arc can ionize N in air nearby2, cause absorption of nitrogen by steel ability to be significantly increased.But because full steel scrap electric arc furnaces is melting down
Molten bath carbon content is low afterwards, and oxygen supply intensity deficiency, caused CO number of bubbles is few in molten bath during smelting later stage decarburization, it is impossible to effectively
Remove in molten steel [N]；Electric arc furnaces can carry out denitrogenation using bottom Stirring by Ar Blowing, but bottom blowing flow is relatively low (30-100NL/min), take off
Nitrogen effect is limited.Existing smelting process can not realize full steel scrap electric arc furnace smelting advanced nitrogen substantially.
Therefore, quick full steel scrap electric arc furnace smelting, effective dephosphorization and denitrogenation how are realized, produces low-phosphorous, low nitrogen high-quality
Steel grade, meet the purifying requirement quickly smelted of low cost, be always the technical bottleneck of full steel scrap electric arc furnace smelting urgent need to resolve.
The content of the invention
In view of the above-mentioned problems, the utility model proposes a kind of complete purifying quick smelting device system of steel scrap electric arc furnaces, should
Apparatus system can be according to full steel scrap electric arc furnace smelting process, and by bath variety classes medium, dynamically wheel blows at times, smelting
Refine and accelerate melting down, raising molten bath carbon content using bath carburetion early stage, smelt the middle and later periods and strengthen melt tank reaction high efficiency dephosphorating, depth
Denitrogenation, so as to accelerate full steel scrap electric arc furnace smelting rhythm, improve dephosphorization, denitrification effect, improve Cleanliness of Molten Steel, realize full steel scrap
The purifying quick smelting of electric arc furnaces.
Apparatus system includes control system, supply control valve group, carrier gas A- carburetting pulvis injection system, carrier gas B- dephosphorization powder
Agent injection system, conveyance conduit, carburetting road automatic stop valve, dephosphorization road automatic stop valve, spray gun.The carrier gas A- carburetting pulvis
The pipeline of injection system is in parallel with the pipeline of carrier gas B- dephosphorization pulvis injection systems.The supply control valve group one passes through gas stream
Amount control system is connected with carrier gas A- carburetting pulvis injection systems, carrier gas A- carburetting pulvis injection systems by conveyance conduit and
Carburetting road automatic stop valve is connected with spray gun；Supply control valve group two passes through gas Flowrate Control System and carrier gas B- dephosphorization powder
Agent injection system is connected, and carrier gas B- dephosphorization pulvis injection systems pass through conveyance conduit and dephosphorization road automatic stop valve and spray gun phase
Connection；Control system is by controlling supply control valve group, gas Flowrate Control System one, gas Flowrate Control System two, carrier gas
A- carburetting pulvis injection system, carrier gas B- dephosphorization pulvis injection system, carburetting road automatic stop valve and dephosphorization road automatic stop valve
Action, realize that dynamically wheel blows bath variety classes medium at times.
The spray gun integral installation is inside arc furnace bottom side refractory material, and lance outlet is 0.3 below molten steel face
~1.0m (distance L in Fig. 21), it is 0~60 ° (angle A in Fig. 2) with horizontal plane angle.The spray gun uses circumferential weld sleeve design,
Central tube uses straight tube nozzle, and internal diameter size is 8~20mm, 2~6mm of wall thickness, 1~5mm of circumferential weld gap.
The spray gun central tube blowing media has pure gas, carrier gas A- carburetting pulvis powder air-flows, carrier gas B- dephosphorization pulvis powder
3 kinds of patterns of air-flow.The pure gas pattern, pure gas N2、Ar、O2、CO2Or O2-CO2Gaseous mixture, CO2Volume flow proportion 0
~100%；The carrier gas A- carburetting pulvis pattern, carrier gas A are air, N2Or CO2, carburetting pulvis be carbon dust, graphite carburant,
Coke blacking or coal dust, carburetting powder particles diameter<2.0mm.The carrier gas B- dephosphorizations pulvis pattern, carrier gas B are O2Or O2-CO2It is mixed
Close gas, CO2Volume flow proportion 0~100%, dephosphorization pulvis are pulverized limestone or agstone, dephosphorization powder particles diameter<
2.0mm.The spray gun circumferential weld pipe blowing media is propane, natural gas, N2Or Ar.The stream of the spray gun central tube injection pure gas
Amount, the carrier gas flux of carrier gas A- carburetting pulvis and carrier gas B- dephosphorization pulvis and dust speed and spray gun circumferential weld pipe blowing media
Flow dynamics are adjustable.
The utility model is applied to the full steel scrap arc furnace smelting procedures of 30~300t.By the utility model in full steel scrap electricity
Decarburization pulvis and dephosphorization pulvis are directly inputted into molten bath using spray gun in arc stove steelmaking process, in the carburetting fluxing stage, significantly carried
High molten bath carbon content, accelerated using carburizing melting down；In the high efficiency dephosphorating stage, significantly improve dephosphorization effect；In the depth denitrification stage, utilize
A large amount of CO bubble advanced nitrogen caused by reaction, molten steel cleanness is significantly improved, Improving The Quality of Products, accelerates to smelt rhythm,
Reduce production cost.
Brief description of the drawings
Fig. 1 is the injection system connection figure that the full steel scrap steel-making course of the electric arc furnace of the utility model uses.
Fig. 2 is that the full steel scrap electric arc furnaces spray gun of the utility model installs profile (A-A sections in Fig. 1).
1, control system in Fig. 1, Fig. 2,2, supply control valve group, 3, carrier gas A- carburetting pulvis injection systems, 4, carrier gas B-
Dephosphorization pulvis injection system, 5, gas Flowrate Control System one, 6, carburetting pulvis hold-up tank, 7, pulvis flow control system one,
8th, gas Flowrate Control System two, 9, dephosphorization pulvis hold-up tank, 10, pulvis flow control system two, 11, conveyance conduit one, 12,
Conveyance conduit two, 13, carburetting road automatic stop valve, 14, dephosphorization road automatic stop valve, 15, spray gun, 16, electric arc furnaces, 17, fire door
Mouthful, 18, tapping hole, 19, furnace wall refractory, 20, slag blanket, 21, molten steel face, 22, molten steel.
Embodiment
A kind of purifying quick smelting device system of full steel scrap electric arc furnaces, includes control system, supply controls using equipment
Valve group, carrier gas A- carburetting pulvis injection system, carrier gas B- dephosphorization pulvis injection system, conveyance conduit, carburetting road automatic stop valve,
Dephosphorization road automatic stop valve, spray gun；The pipeline of the carrier gas A- carburetting pulvis injection system and carrier gas B- dephosphorizations pulvis injection system
The pipeline of system is in parallel；The supply control valve group (2) is blown by gas Flowrate Control System one (5) and carrier gas A- carburetting pulvis
System (3) is connected, and carrier gas A- carburetting pulvis injection systems (3) pass through conveyance conduit (12) and carburetting road automatic stop valve (13)
It is connected with spray gun (15)；Control valve group (2) is supplied to be blown by gas Flowrate Control System two (8) and carrier gas B- dephosphorizations pulvis
System (4) is connected, and carrier gas B- dephosphorization pulvis injection systems (4) pass through conveyance conduit (12) and dephosphorization road automatic stop valve (14)
It is connected with spray gun.
The spray gun integral installation is inside arc furnace bottom side refractory material, and lance outlet is 0.3 below molten steel face
~1.0m, it is 0~60 ° with horizontal plane angle.The spray gun uses circumferential weld sleeve design, and central tube uses straight tube nozzle, internal diameter
Size is 8~20mm, 2~6mm of wall thickness, 1~5mm of circumferential weld gap.
Implementation steps are as follows
Step 1：After arc furnace tapping to before adding furnace charge, control system closes carburetting road automatic stop valve, opens dephosphorization
Road automatic stop valve, it is blown using dephosphorization conveyance conduit.Spray gun central tube and circumferential weld pipe injection N2, to prevent spray gun from blocking, burning
Damage.
Step 2：Electric arc furnaces feeding stage, continue with the injection of dephosphorization conveyance conduit, spray gun central tube injection O2, circumferential weld pipe
Propane or natural gas are blown, ensures charging process spray gun normal work.
Step 3：Carburetting fluxing stage, control system open carburetting road automatic stop valve, close dephosphorization road automatic stop valve,
It is blown using carburetting conveyance conduit, spray gun central tube performs carrier gas A- carburetting pulvis patterns, accelerates steel scrap carburizing fusing.
Step 4：Pipe-line purging stage, control system close carburetting road automatic stop valve, open dephosphorization road automatic stop valve,
It is blown using dephosphorization conveyance conduit, control spray gun central tube injection N2Or CO2Carry out pipe-line purging.
Step 5：In the high efficiency dephosphorating stage, the injection of dephosphorization conveyance conduit is continued with, spray gun central tube performs carrier gas B- dephosphorizations
Pulvis pattern, carrier gas B and dephosphorization pulvis are directly inputted inside molten steel and strengthen melting bath stirring ability, high efficiency dephosphorating.
Step 6：In the depth denitrification stage, using the injection of dephosphorization conveyance conduit is continued with, spray gun central tube is blown O2-CO2It is mixed
Gas is closed, strengthens molten bath decarburizing reaction, and effectively remove in molten steel [N] using a large amount of CO bubbles caused by reaction.
Step 7：In the smelting endpoint stage, the injection of dephosphorization conveyance conduit is continued with, spray gun central tube performs carrier gas B- dephosphorizations
Pulvis pattern, prevent molten steel " rephosphorization "；Close to smelting endpoint and arc furnace tapping process, (the spray of dephosphorization conveyance conduit is continued with
Blow, spray gun central tube injection Ar.
Claims (3)
- A kind of 1. purifying quick smelting device system of full steel scrap electric arc furnaces, it is characterised in that：Using equipment include control system, Supply control valve group, carrier gas A- carburetting pulvis injection system, carrier gas B- dephosphorization pulvis injection system, conveyance conduit, carburetting road certainly Dynamic stop valve, dephosphorization road automatic stop valve, spray gun；The pipeline of the carrier gas A- carburetting pulvis injection system and carrier gas B- dephosphorization powder The pipeline of agent injection system is in parallel；The supply control valve group (2) passes through gas Flowrate Control System one (5) and carrier gas A- carburetting Pulvis injection system (3) is connected, and carrier gas A- carburetting pulvis injection systems (3) are cut automatically by conveyance conduit (12) and carburetting road Disconnected valve (13) is connected with spray gun (15)；Supply control valve group (2) passes through gas Flowrate Control System two (8) and carrier gas B- dephosphorizations Pulvis injection system (4) is connected, and carrier gas B- dephosphorization pulvis injection systems (4) are cut automatically by conveyance conduit (12) and dephosphorization road Disconnected valve (14) is connected with spray gun.
- A kind of 2. purifying quick smelting device system of full steel scrap electric arc furnaces as claimed in claim 1, it is characterised in that：The spray Rifle integral installation is inside arc furnace bottom side refractory material, lance outlet 0.3~1.0m below molten steel face, with horizontal plane Angle is 0~60 °.
- A kind of 3. purifying quick smelting device system of full steel scrap electric arc furnaces as claimed in claim 1, it is characterised in that：The spray Rifle uses circumferential weld sleeve design, and central tube uses straight tube nozzle, and internal diameter size is 8~20mm, 2~6mm of wall thickness, circumferential weld gap 1 ~5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720994090.XU CN207031484U (en) | 2017-08-10 | 2017-08-10 | A kind of purifying quick smelting device system of full steel scrap electric arc furnaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720994090.XU CN207031484U (en) | 2017-08-10 | 2017-08-10 | A kind of purifying quick smelting device system of full steel scrap electric arc furnaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207031484U true CN207031484U (en) | 2018-02-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720994090.XU Active CN207031484U (en) | 2017-08-10 | 2017-08-10 | A kind of purifying quick smelting device system of full steel scrap electric arc furnaces |
Country Status (1)
| Country | Link |
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| CN (1) | CN207031484U (en) |
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2017
- 2017-08-10 CN CN201720994090.XU patent/CN207031484U/en active Active
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