CN201031238Y - Oxygen spray pistol used for steel-smelting furnace - Google Patents
Oxygen spray pistol used for steel-smelting furnace Download PDFInfo
- Publication number
- CN201031238Y CN201031238Y CNU200720069253XU CN200720069253U CN201031238Y CN 201031238 Y CN201031238 Y CN 201031238Y CN U200720069253X U CNU200720069253X U CN U200720069253XU CN 200720069253 U CN200720069253 U CN 200720069253U CN 201031238 Y CN201031238 Y CN 201031238Y
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- Prior art keywords
- oxygen
- steel
- oxygen lance
- shower nozzle
- spray orifice
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Abstract
The utility model discloses an oxygen lance nozzle for steelmaking, which comprises a spray head body. A plurality of equispaced jet orifices are arranged on the diameter of the distribution circle of the spray head body, wherein the jet orifices are inclined to the central line of the spray head body. The utility model has the advantages that oxygen supply intensity can be enhanced, and service life of the oxygen lance nozzle can also be assured, and utilization efficiency of oxygenous decarburization can be maintained, and secondary combustion efficiency of CO can be improved, and oxygen-supply operation is more stable, thereby overall utilization of oxygen, and yielding rate of chrome and hit-rate of aim carbon content are improved.
Description
Technical field
The utility model relates to a kind of oxygen lance blow head, relates in particular to a kind of steel melting furnace oxygen lance blow head.
Background technology
During stainless steel smelting, alloy addition is big, needs to replenish a large amount of heats.Generally speaking, need be heating plant all with the electric furnace, melt whole steel scraps and most of alloy.As the most frequently used stainless steel production equipment, AOD (argon-oxygen-decarburization process) stove is finished processing such as oxygen decarburization, Reducing and Alloying and slag making desulfurization.When walking around electric furnace and adopt full molten iron and alloy to be the main raw material smelting stainless steel, compare with adopting the technical process of electric furnace mother liquor smelting stainless steel, except that the decarburization task increased the weight of, the heat degree of unbalancedness in the AOD stove was up to more than 15%.For as early as possible the carbon in the molten bath being reduced to the specification level, make full use of the chemical heat of carbon rejection process, reasonably AOD oxygen supply mode and oxygen supply system decisive role.
For only adopting the AOD stove of embed type side-blown sleeve pipe oxygen supply, further improve oxygen-supplying amount, the Oxygen Flow thigh is to the recoil effect aggravation of furnace lining, lining life sharply reduces, the body of heater vibration is obvious, and its fastening is damaged frequent, in addition, the air voids of gas is state of saturation in the biphase gas and liquid flow that forms in the molten bath, and the decarburization utilization ratio of gas descends.For shortening the heat, enhance productivity, adopt the oxygen supply in the AOD stove of top side composite oxygen rifle.Top rifle commonly used is a single hole Laval type, and under the certain operation condition, when oxygen flow was too high, oxygen jet was too dark to the impact in molten bath, and the suffered mechanical shock of furnace bottom is too big, easily cause splash, and the secondary combustion efficient of CO will reduce significantly in the burner hearth.When being the raw material smelting stainless steel with the chrome ore, the uneven aggravation of the heat of process, the decarburization task is heavier, and for this reason, Japanese JFE adopts straight tube oxygen rifle to the molten bath oxygen supply, and to improve the efficiency of combustion of CO, the heat that increases in the stove is supplied with.
Patent 93230007.3 discloses a kind of open hearth single channel shunting oxygen blast shower nozzle, by main oxygen shower nozzle, secondary oxygen shower nozzle be connected steel pipe and form, main oxygen shower nozzle and secondary oxygen shower nozzle couple together by outer steel pipe and middle cover steel pipe, interior cover steel pipe is connected with main oxygen shower nozzle, main oxygen shower nozzle is provided with main oxygen hole, secondary oxygen shower nozzle is provided with subsidiary oxygen hole, the length of selecting to connect steel pipe realizes major and minor oxygen hole difference of altitude, can fully satisfy the processing requirement of open hearth blowing, easy to process, reduce manufacturing costs such as shower nozzle material and processing.There is the lower shortcoming of decarburization efficient in this invention.
Summary of the invention
The purpose of this utility model provides a kind of steel melting furnace oxygen lance blow head, it not only guarantee smelting process steadily, prolong the life-span of shower nozzle, and improve the hit rate of oxygen decarburization utilising efficiency, CO secondary combustion efficient and end point carbon.
The purpose of this utility model is achieved in that
A kind of steel melting furnace oxygen lance blow head comprises sprayer body, and the distribution circle diameter of sprayer body is provided with a plurality of uniform spray orifices, and a plurality of spray orifices become an inclination angle with the sprayer body medullary ray.
Preferably, the number of described a plurality of spray orifices is 3-5.
Preferably, the throat diameter of described spray orifice
Be 20-22mm, the exit diameter of spray orifice
Be 25-29mm, the flare angle α of spray orifice is the 3-4 degree.
Preferably, the inclination angle [theta] of described spray orifice is the 10-15 degree.
Preferably, the distribution circle diameter d of described spray orifice
cBe 90-100mm.
The utility model is owing to adopted above-mentioned technical scheme, make it compared with prior art, have following advantage and positively effect: can be when increasing oxygen supply intensity, guarantee the shower nozzle life-span, keep the oxygen decarburization utilising efficiency, improve CO secondary combustion efficient, make oxygen-supply operation more stable, thereby improved total utilising efficiency of oxygen, the recovery rate of chromium and end point carbon hit rate.
Description of drawings
Fig. 1 is the sectional view of the utility model steel melting furnace with oxygen lance blow head.
Embodiment
As shown in Figure 1, for satisfying AOD converter CO secondary combustion and the requirement of decarburization fast, adopting Laval type spray gun is a scheme preferably.According to converter tonnage and physical condition, on the distribution circle diameter of this spray gun sprayer body, establish a plurality of uniform spray orifices, hole count can be decided to be 3～5 holes.Though hole count increases the impulse source degree is reduced, area strengthens, and helps improving thermo-efficiency, can make molten bath stirring and transmission ofenergy reach good balance, and make smelting more steady, carries out more efficiently.
For alleviating the mutual blending of spray orifice outlet oxygen jet, reduce the oxygen jet stack in molten bath is impacted, divide the blessing circular diameter to be taken as d
c=90～100mm.
During AOD stove smelting stainless steel, need under the situation that reduces the chromium scaling loss as far as possible, the carbon in the molten steel be reduced to the specification level.For this reason, under the condition of top side top-bottom blowing, must guarantee that oxygen jet has enough penetration depths to the molten bath, make the molten bath obtain enough stirring energy, the oxygen enrichment melt that promotes the top blast oxygen jet to contact place, hot-activity district with molten steel can be delivered to inside, molten bath as early as possible, quicken the mixing and the decarburization in molten bath, thereby obtain higher carbon deoxidation utilising efficiency.Based on this, select high slightly jet exit Mach number for use.In conjunction with practical situation, get M=1.9～2.5.Consider the pressure-losses in the actual procedure, it is between 0.71～1.77 Mpa that corresponding operating mode oxygen is pressed.According to concrete furnace capacity and processing condition, consider oxygen supply intensity and oxygen supply ratio respectively at 2.00～2.25 and 0.54～0.59 o'clock, a corresponding item rifle oxygen flow is respectively 7800Nm
3/ hr～9600Nm
3/ hr.The definite of shower nozzle throat diameter needs to consider that oxygen jet can form enough impact energys to the molten bath under the oxygen supply intensity that is provided.Based on this, the throat diameter of shower nozzle can be decided to be
=19～22mm.Corresponding exit diameter is
=25.1～29.0mm.
To the Laval shower nozzle, the effect of expansion segment is that the velocity of sound air-flow is accelerated to supersonic airstream, and little flare angle has the control expansion, outlet this moment stream thigh has slight expansion, oxygen flow is pressed close to hole wall and is flowed and laminar flow can occur, mixes with stove oxygen thereby increase the weight of the jet surface, helps improving thermo-efficiency.Large expansion angle control expansion is little, and expansion segment is short, and it is little influenced by Hole Wall Roughness, helps reducing oxygen effusive power loss, raising effect molten bath penetrating force.Consider the penetrativity of shower nozzle, should get bigger flare angle, be decided to be α=3～4 °, expansion segment length is own L
e=55～65mm.
Generally speaking, when inclination angle, shower nozzle hole was excessive, oxygen jet may impact furnace lining; When too small, flow attracting each other of thigh and may cause the stream thigh to converge on the face of molten bath, the stream thigh is not enough to the impact kinetic energy in molten bath, the oxygen decarburization decrease in efficiency.Be equipped with rational oxygen rifle operating method, take all factors into consideration the converter tonnage and the type of furnace, guarantee that each stream of effusive strand does not cross, and require shower nozzle that the molten bath is had certain impact area, the inclination angle of choosing, hole is θ=10～15 °.
As for the use of oxygen rifle, reasonably oxygen lance position is related to the life-span, Oxygen Flow thigh of oxygen rifle to the shock effect in molten bath and the comprehensive utilization ratio of oxygen.This patent is based on 120 tAOD stoves, and definite oxygen lance position is 2000～2800mm, and the jet impulse ratio is 0.301～0.383.
By the setting of above-mentioned parameter, make top rifle oxygen supply intensity reach as high as 1.33Nm
3/ (mint); The oxygen lance blow head life-span reaches 900～1100 stoves; The oxygen decarburization utilization ratio is 0.78～0.83; O.80 averaged oxygen gas decarbonization utilising efficiency can reach; CO secondary combustion efficient is more than 15%, and terminal temperature can improve 3～10 ℃; The chromium recovery rate improves 0.1～0.3%; Oxygen-supply operation is more stable, and the end point carbon hit rate improves about 10%.
Provide two kinds of shower nozzle specifications and result of use thereof below:
| Hole count | Throat diameter (mm) | Exit diameter (mm) | Flare angle (°) | The inclination angle, hole (°) | End face circular diameter (mm) | |
| Shower nozzle A | 3 | 20.60 | 27.90 | 3.5 | 15 | 95 |
| Shower nozzle B | 3 | 20.60 | 27.90 | 3.5 | 11 | 95 |
When adopting shower nozzle A, operation rifle position is that 2000～2500mm and total oxygen supply intensity are 2.00～2.25Nm
3/ (mint), on 120 tAOD stoves, tried out 3 shower nozzles altogether, the shower nozzle mean lifetime is 930 stoves, and averaged oxygen gas decarbonization utilization ratio is 0.79, and CO secondary combustion efficient is 16.3%, and the chromium recovery rate improves 0.15%, and the end point carbon hit rate promotes about 5%.
When adopting shower nozzle B, operation rifle position is that 2100～2800mm and total oxygen supply intensity are 2.00～2.15Nm
3/ (mint) in, on 120 tAOD stoves, tried out 4 shower nozzles altogether, the shower nozzle mean lifetime is 1030 stoves, averaged oxygen gas decarbonization utilization ratio is 0.81, CO secondary combustion efficient is 13.2%, the chromium recovery rate improves 0.21%, the end point carbon hit rate promotes about 12%.
Claims (5)
1. a steel melting furnace oxygen lance blow head comprises sprayer body, it is characterized in that:
The distribution circle diameter of sprayer body is provided with a plurality of uniform spray orifices, and a plurality of spray orifices become an inclination angle with the sprayer body medullary ray.
2. a kind of steel melting furnace oxygen lance blow head as claimed in claim 1 is characterized in that: the number of described spray orifice is 3-5.
3. a kind of steel melting furnace oxygen lance blow head as claimed in claim 2 is characterized in that: the throat diameter φ of described spray orifice
tBe 20-22mm, the exit diameter φ of spray orifice
eBe 25-29mm, the flare angle α of spray orifice is the 3-4 degree.
4. a kind of steel melting furnace oxygen lance blow head as claimed in claim 3 is characterized in that: the inclination angle [theta] of described spray orifice is the 10-15 degree.
5. as claim 4 described a kind of steel melting furnace oxygen lance blow heads, it is characterized in that: the distribution circle diameter d of described spray orifice
cBe 90-100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720069253XU CN201031238Y (en) | 2007-04-24 | 2007-04-24 | Oxygen spray pistol used for steel-smelting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720069253XU CN201031238Y (en) | 2007-04-24 | 2007-04-24 | Oxygen spray pistol used for steel-smelting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201031238Y true CN201031238Y (en) | 2008-03-05 |
Family
ID=39163132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720069253XU Expired - Fee Related CN201031238Y (en) | 2007-04-24 | 2007-04-24 | Oxygen spray pistol used for steel-smelting furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201031238Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993127A (en) * | 2014-05-30 | 2014-08-20 | 河北唐银钢铁有限公司 | Oxygen lance nozzle with concentrated streams |
| CN105331765A (en) * | 2015-11-26 | 2016-02-17 | 宣化钢铁集团有限责任公司 | Method for secondary gun feeding blowing of dry dust removing converter |
-
2007
- 2007-04-24 CN CNU200720069253XU patent/CN201031238Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993127A (en) * | 2014-05-30 | 2014-08-20 | 河北唐银钢铁有限公司 | Oxygen lance nozzle with concentrated streams |
| CN103993127B (en) * | 2014-05-30 | 2016-03-30 | 河北唐银钢铁有限公司 | A kind of oxygen lance blow head with concentrated a fluid stream |
| CN105331765A (en) * | 2015-11-26 | 2016-02-17 | 宣化钢铁集团有限责任公司 | Method for secondary gun feeding blowing of dry dust removing converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080305 Termination date: 20160424 |