CN202107717U - Molten iron desulfurization stirrer with improved vane structure - Google Patents
Molten iron desulfurization stirrer with improved vane structure Download PDFInfo
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- CN202107717U CN202107717U CN2011201730588U CN201120173058U CN202107717U CN 202107717 U CN202107717 U CN 202107717U CN 2011201730588 U CN2011201730588 U CN 2011201730588U CN 201120173058 U CN201120173058 U CN 201120173058U CN 202107717 U CN202107717 U CN 202107717U
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Abstract
The utility model discloses a molten iron desulfurization stirrer with an improved vane structure, which comprises a rotating shaft and three to four stirring vanes uniformly arranged at the lower end of the rotating shaft along the circumferential direction of the rotating shaft. The outer side surface of the stirring vane is an arc surface inclined outwards and the camber angle gamma thereof is 0-3 degrees. The surface facing melt iron and the surface deviating melt iron of the stirring vane are all inclined planes inclining forwards from bottom to top. The inclination angle beta of the surface deviating melt iron and the inclination angle alpha of the surface facing melt iron satisfy the following mathematical relationships: beta is more than or equal to alpha and alpha is within the range of 0-8 degrees. The lower surface of the stirring vane is an arc surface. The central area of the lower surface of the stirrer corresponding to the rotating shaft is a spherical crown surface. The height of the spherical crown surface is equal to the height of the arc surface of the lower surface of the stirring vane. The edge of the stirring vane is a corner angle transition surface or an arc transition surface. According to the molten iron desulfurization stirrer, axial cracks and exfoliated pits of the circumferentially symmetrical line area on the outer side surface of the stirrer are avoided and the wearing, exfoliated pits and the breakage of the corresponding area of the rotating shaft between the lower surfaces of the stirring vanes are also avoided. Therefore, the service life of the stirrer is prolonged.
Description
Technical field
The utility model relates to the outer mechanical agitation desulfuration whipping appts of the preceding molten iron stove of converter steelmaking, specifically a kind of melten iron desulfur agitator that is applicable to the improvement blade construction of large-scale molten iron KR stirring desulphurization equipment.
Background technology
Whisking appliance is the vitals in KR (Kambara Reactor) desulfurizer; Also be that sweetening agent mixes the unique power resources of dispersive in molten iron; Thereby the structural shape of the structure formation of whisking appliance and paddle directly has influence on entrainment blending dispersion situation and the desulfurizing iron efficient of sweetening agent in molten iron; Simultaneously also directly have influence on the interaction between molten iron and sweetening agent solid-liquid two-phase flow and the whisking appliance, the damaged situation and the work-ing life of whisking appliance, finally have influence on the desulfurizing iron technico-economical comparison.
The whisking appliance of the molten iron KR stirring desulphurization that generally adopts both at home and abroad at present, is made up of turning axle and four paddles.Four paddles circumferentially are cruciform along turning axle evenly to be arranged, and the metal-cored thickness direction plane of symmetry of paddle and rotating shaft center's line are in same plane.Paddle commonly used is met untouchable be vertical surface or the CW inclined-plane, 2 ° of left and right sides that leans forward from bottom to top; The back iron face is a vertical surface; The side is lean outward inclined-plane about 2 °, footpath from bottom to top, and this kind blade construction stirs that resistance is big, power consumption is high, it is few to entrainment internal circulating load.In addition; Also there is following drawback: 1, because the paddle heat exchange area per unit volume is big; Cause that paddle refractory materials working lining thermal shock temperature changing speed is fast, scope is big, the thermal shock crackle with peel off serious; Especially stir the big radial outside position, paddle bottom of vorticity, occur the working lining bulk often and peel off with paddle is metal-cored and burn, whisking appliance is short work-ing life; 2, because the difference of working lining refractory materials and metal-cored material hot expansibility; Especially paddle, because it does not metal-coredly carry out air-cooledly, the difference of working lining refractory materials and metal-cored material hot expansibility is bigger; Cause and form heat expansion internal stress and shrinkage gap between bonding surface; Cause that refractory materials working lining internal stress is damaged, constantly expand along decreasing the slit in the bonding surface, finally cause working lining to peel off and lose with metal-cored burning through the molten iron that crackle infiltrates; 3, because violent stirring, the overhanging structure of whisking appliance leaf and the linear relationship of rotational line speed and rotating diameter under the hot conditions of whisking appliance; Paddle refractory materials working lining and arris protrusion position molten iron erosive wear are violent; Especially stir the big paddle bottom back iron face of vorticity; Speed of rotation in whisking appliance under the mixing torque improves constantly; Further aggravated the rate of wear of paddle, thereby the stirring desulphurization effect and the actual production that have influenced under the different operational phases of whisking appliance control, and cause desulfuration efficiency to descend and the sorbent consumption rising; 4, the raising of the uneven wear of paddle and whisking appliance speed of rotation has influenced the transient equilibrium and the statical equilibrium of whisking appliance, has aggravated the damage of Mixing Machine transmission apparatus, brings harm for the safe and stable operation of equipment.In the stirring desulphurization process, because the Stagnation Action of leaf angle causes a large amount of desulfurization slag and molten iron mixture to stop at this region clustering; And under hot conditions, cause dry slag, and, cause the scarfing cinder difficulty big because this regional space is narrow and small through erosion, infiltration to the refractory materials working lining; And then the effective active area and the stirring intensity of paddle have been reduced; The dynamic conditions of the molten iron stirring desulphurization that worsens, simultaneously, the dry slag mechanical cleaning of leaf angle; Cause the serious physical abuse of whisking appliance leaf, aggravated the damaged process of whisking appliance leaf.Thereby the breakage of whisking appliance mainly concentrates on the paddle position, finally because of the badly broken of paddle structural integrity, the decline significantly of stirring intensity and the use that dynamically balanced unstability stops whisking appliance.
Chinese scholars is from delaying the damaged process of whisking appliance refractory materials working lining and improving the dynamic (dynamical) angle of KR stirring desulphurization and carried out series of studies work; For example: document " improvement (translating selected passages) of desulfurizing iron technology " (Taiyuan Iron and Steel Co. translation; 1994; (1); 20-25) introduced SUMITOMO CHEMICAL metal deer island system iron taken the lead in studying the influence of agitator paddle diameter and agitating vane shape the nineties in last century to the desulfurization dynamic conditions, and the kinetics innovative approach of agitator paddle hole enlargement and the outer convex stirring of blade face is proposed.Wherein, Though agitator paddle hole enlargement at home and abroad some iron and steel enterprises is applied; But molten iron liquid level lifting height, stirring intensity and vibration are big during because of stirring; Influenced iron ladle molten iron efficient loading amount, reduced whisking appliance work-ing life, even jeopardize safety in production greatly because of the whipping device vibration; With the outer convex stirring face of blade is the special-shaped agitating vane shape maintains difficulty and being applied in actual use of characteristic; Granted publication number is the whisking appliance of arc transition face for the Chinese patent of CN2923725Y " novel KR desulfur agitator " discloses the metal-cored corner angle of a kind of paddle limit, reduces because the breakage that the stress concentration of internal stress that working lining refractory materials and metal-cored material hot expansibility difference cause and paddle edge regions causes; Granted publication number is metal-cored with air-cooled whisking appliance for the Chinese patent of CN201046975Y " desulfurization agitator head for hot metal " discloses a kind of paddle; Reduced the metal-cored integrated temperature of paddle when using; Alleviate the metal-cored thermal expansion with the refractory materials working lining of paddle, improved the comprehensive resisting breakage ability of paddle; Publication number be the Chinese patent " a kind of molten iron stirring-head " of CN101403022A to disclose a kind of paddle working lining arris be the whisking appliance of arc transition structure, improve the antiwear property of whisking appliance leaf working lining, reach and prolong the whisking appliance purpose in work-ing life; Publication number is that the Chinese patent " a kind of desulfurization agitator head for hot metal " of CN101037715A discloses a kind of paddle and meets and untouchablely be the melten iron desulfur agitator on flare inclined-plane from bottom to top for preceding concave arc surface, back iron face are last recessed protruding multistage arc, side; Through the polymorphic structure paddle, reach and improve stirring-head the stirring of sweetening agent is entrainmented intensity, improved the purpose of desulfurization dynamic conditions.But the whisking appliance of above-mentioned patent and investigative technique is four leaf cruciform decoration forms, and angle is 90 ° between the paddle, still can not solve between the paddle dry slag problem seriously, is unfavorable for the improvement of stirring desulphurization dynamic conditions; Publication number is that the Chinese patent " a kind of stirrer for desulphurization of molten iron " of CN101603111A discloses a kind of paddle and meets the three leaf whisking appliances that untouchable and back iron face are the inclined-plane that leans forward; Through the three leaves structure that leans forward, strengthen to stir and entrainment the space and entrainment circular flow, reach and improve desulfurization dynamic conditions purpose; And make the angle between the leaf increase to 120 °; Reduce dry slag speed between the leaf, made things convenient for the cleaning of dry slag, improved the stability of stirring intensity.
In addition; Granted publication number for the Chinese patent of CN201406443Y " melten iron desulfur agitator " disclose a kind of paddle meet untouchable for the convex-shaped arc surface that leans forward, back iron face be vertical plane or rake, axial three leaf whisking appliances of the trapezoidal faces that inwardly contracts for the footpath of vertical cross-section; Polymorphic structure design through paddle; At aforementioned publication number is on Chinese patent " a kind of stirrer for desulphurization of molten iron " basis of CN101603111A; Further increased the angle between the paddle, strengthened whisking appliance shearing dispersive ability and stirring desulphurization dynamic conditions improve effect; Publication No. is that the Chinese patent " turbine type stirrer used for molten iron mechanical stirring desulfuration " of CN101857912A discloses a kind of three leaf whisking appliances that are made up of turning axle, wheel hub and paddle; Increased the girth that paddle is circumferentially evenly arranged; The layout of leaf and the preparation of whisking appliance have been made things convenient for; Make paddle meet that end line and wheel hub interface point tangent line angle ф can reach 132～180 ° scope on the molten iron face; Increased substantially the knuckle of whisking appliance leaf part workplace, reduced the Stagnation Action of knuckle, delayed the mechanical damage that the cleaning of knuckle dry slag speed and dry slag causes stirred fluid; Increase paddle and met untouchable area and stir radial turbine, improved the mechanical efficiency and the blending dispersion degree that stir.Above-mentioned patented technology is applied in actual production, and has obtained good improvement effect.
Along with the continuous development that converter is maximized, molten iron KR stirring desulphurization equipment also maximizes thereupon.At present; The KR stirring desulphurization iron ladle rated capacity of domestic maximum has reached 300t; Desulfur agitator physical dimension also significantly enlarges, and rachis is to highly reaching 1m, and paddle circumferential thickness δ reaches 490mm; Whisking appliance rotating diameter Φ reaches 1.545m, and leaf outer side to stir shaft medullary ray straight length L reaches 0.72m.Because the significantly expansion of whisking appliance physical dimension increases with the rotational line speed equal proportion under the speed conditions, thereby, promoted the damaged process of agitator blades, cause and maximize in work-ing life of same structure whisking appliance and constantly descend along with whisking appliance.Simultaneously; Maximization along with whisking appliance; Shape difference between agitator blades outer side and the fluid agitation streamline increases; Cause the medium-and-large-sized agitator blades outer side of whipping process to form the intensive eddy current, cause the violent eddy current wearing and tearing of blade outer side, the axial crack in the circumferential symmetric line of paddle outer side zone with peel off pit.
Simultaneously; The maximization of whisking appliance also makes whisking appliance following table area increase, the whisking appliance lower surface strengthens the containment effect in agitation cycle flow field, promoted the flow field to the wearing and tearing of whisking appliance lower surface with peel off; Especially leaf outer side lower region; Owing to receive the eddy current wearing and tearing of blade side eddy current wearing and tearing, bottom back iron face and the multiple influence of lower surface wearing and tearing simultaneously, wear and tear and peel off more violently, even pit appears peeling off.Under the damaged acting in conjunction of paddle outer side and whisking appliance lower surface, cause turning axle corresponding zone working lining between paddle bottom and the paddle lower surface to peel off and stop using with metal-cored burning, cause large stirrer lower work-ing life.Simultaneously, the maximization of molten iron KR stirring desulphurization equipment raises the desulphurised hot metal temperature, has further worsened the working conditions of whisking appliance, has reduced large stirrer work-ing life.
The utility model content
The purpose of the utility model is exactly that a kind of melten iron desulfur agitator that improves blade construction will be provided; Solve axial crack that large-scale molten iron KR stirring desulphurization equipment occurs in the circumferential symmetric line of paddle outer side zone and peel off pit, and wearing and tearing and the technical problem of peeling off pit appear in the turning axle corresponding zone between the paddle lower surface.
For realizing above-mentioned purpose; The melten iron desulfur agitator of the improvement blade construction that the utility model designed comprises turning axle, be arranged at the turning axle lower end and along its three to four paddles circumferentially evenly arranging; The outer side of said paddle is an outer incline arc surface from bottom to top, its camber angle γ=0～3 °.
Further, the molten iron face of meeting of said paddle and the back iron water surface are from bottom to top the inclined-plane that leans forward, and back iron water surface angle of inclination beta with meet molten iron face inclination alpha and satisfy following mathematical relation: β >=α, α=0～8 °; The lower surface of said paddle is an arc surface; The whisking appliance lower surface central zone corresponding with said turning axle is spherical crown surface, and this spherical crown surface height equates with the arc surface height of the lower surface of paddle; The arris of said paddle is corner angle transition face or arc transition face.
The advantage of the utility model is: the melten iron desulfur agitator paddle outer side of the improvement blade construction that is designed is an outer incline arc surface from bottom to top; Paddle rotational line speed is descended vertically gradually; Delay the wearing and tearing of paddle bottom, improved the streamlined of paddle outer side, can contain the formation of molten iron stirring desulphurization process China and foreign countries lateral side regions eddy current; Reduction should be stirred vorticity in the zone, delayed the eddy current wearing and tearing process of paddle outer side; The molten iron face of meeting of paddle and the back iron water surface are the inclined-plane that leans forward from bottom to top, have reduced the vorticity of the back iron water surface, have improved the stirring intensity of paddle; The whisking appliance lower surface central zone corresponding with said turning axle is spherical crown surface; And this spherical crown surface height equates with the arc surface height of the lower surface of paddle; It is integrally-built streamlined to have improved the whisking appliance lower surface; Reduced of the wearing and tearing of circulation flow field, also made things convenient for the placement that erects of whisking appliance simultaneously the whisking appliance lower surface; The paddle arris is corner angle transition face or arc transition face, can delay the wearing and tearing process of paddle arris.The utility model is through the improvement to the paddle blade construction; The axial crack that can contain the circumferential symmetric line of whisking appliance leaf outer side zone with peel off pit and with the corresponding whisking appliance lower surface wearing and tearing in turning axle lower end with peel off pit breakage process, the work-ing life of prolongation whisking appliance.
Description of drawings
Fig. 1 is the melten iron desulfur agitator master TV structure synoptic diagram of the improvement blade construction of the utility model.
Fig. 2 overlooks the sectional structure synoptic diagram for Fig. 1's.
Fig. 3 is the structural representation of looking up of Fig. 1.
Fig. 4 is the A-A sectional structure synoptic diagram of paddle blade among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to describe in detail.
As shown in the figure, the melten iron desulfur agitator of the improvement blade construction of the utility model comprises turning axle 1, be arranged at turning axle 1 lower end and along its paddle of circumferentially evenly arranging 2, paddle 2 can be three or four.The outer side 2a of paddle 2 is an outer incline arc surface from bottom to top, and its camber angle γ is 0～3 °.
Meet molten iron face 2b and the back iron water surface 2c of paddle 2 are from bottom to top the inclined-plane that leans forward, and meeting molten iron face inclination alpha is 0～8 °, and back iron water surface angle of inclination beta is not less than meets molten iron face inclination alpha; The lower surface 2e of paddle 2 is an arc surface; The arris 2d of paddle 2 is corner angle transition face or arc transition face.
With said turning axle 1 corresponding whisking appliance lower surface central zone 1a is spherical crown surface, and this spherical crown surface height equates with the arc surface height of the lower surface 2e of paddle 2.
Claims (8)
1. melten iron desulfur agitator that improves blade construction; Comprise turning axle (1), be arranged at turning axle (1) lower end and along its three to four paddles (2) of circumferentially evenly arranging; It is characterized in that: the outer side (2a) of said paddle (2) is an outer incline arc surface from bottom to top, its camber angle γ=0～3 °.
2. the melten iron desulfur agitator of improvement blade construction according to claim 1; It is characterized in that: the molten iron face of meeting (2b) of said paddle (2) and the back iron water surface (2c) are from bottom to top the inclined-plane that leans forward, and back iron water surface angle of inclination beta with meet molten iron face inclination alpha and satisfy following mathematical relation: β >=α.
3. the melten iron desulfur agitator of improvement blade construction according to claim 2 is characterized in that: said α=0～8 °.
4. according to the melten iron desulfur agitator of claim 1 or 2 or 3 described improvement blade constructions, it is characterized in that: the lower surface (2e) of said paddle (2) is an arc surface.
5. the melten iron desulfur agitator of improvement blade construction according to claim 4; It is characterized in that: the whisking appliance lower surface central zone (1a) corresponding with said turning axle (1) is spherical crown surface, and this spherical crown surface height equates with the arc surface height of the lower surface (2e) of paddle (2).
6. according to the melten iron desulfur agitator of claim 1 or 2 or 3 described improvement blade constructions, it is characterized in that: the arris (2d) of said paddle (2) is corner angle transition face or arc transition face.
7. the melten iron desulfur agitator of improvement blade construction according to claim 4 is characterized in that: the arris (2d) of said paddle (2) is corner angle transition face or arc transition face.
8. the melten iron desulfur agitator of improvement blade construction according to claim 5 is characterized in that: the arris (2d) of said paddle (2) is corner angle transition face or arc transition face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201730588U CN202107717U (en) | 2011-05-27 | 2011-05-27 | Molten iron desulfurization stirrer with improved vane structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201730588U CN202107717U (en) | 2011-05-27 | 2011-05-27 | Molten iron desulfurization stirrer with improved vane structure |
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| Publication Number | Publication Date |
|---|---|
| CN202107717U true CN202107717U (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201730588U Expired - Fee Related CN202107717U (en) | 2011-05-27 | 2011-05-27 | Molten iron desulfurization stirrer with improved vane structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968780A (en) * | 2014-05-16 | 2014-08-06 | 武汉科技大学 | Blade abrasion evaluation method of KR desulfuration paddle agitator |
| CN106086313A (en) * | 2016-07-22 | 2016-11-09 | 武汉钢铁股份有限公司 | Molten iron desulphurization stirring device |
| CN113547641A (en) * | 2021-07-29 | 2021-10-26 | 湖南三一快而居住宅工业有限公司 | Stirring subassembly and mixer |
| CN114433799A (en) * | 2021-12-30 | 2022-05-06 | 江苏飞锦达科技有限公司 | Molten steel stirring device of continuous casting machine |
-
2011
- 2011-05-27 CN CN2011201730588U patent/CN202107717U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968780A (en) * | 2014-05-16 | 2014-08-06 | 武汉科技大学 | Blade abrasion evaluation method of KR desulfuration paddle agitator |
| CN106086313A (en) * | 2016-07-22 | 2016-11-09 | 武汉钢铁股份有限公司 | Molten iron desulphurization stirring device |
| CN113547641A (en) * | 2021-07-29 | 2021-10-26 | 湖南三一快而居住宅工业有限公司 | Stirring subassembly and mixer |
| CN114433799A (en) * | 2021-12-30 | 2022-05-06 | 江苏飞锦达科技有限公司 | Molten steel stirring device of continuous casting machine |
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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 |
Granted publication date: 20120111 Termination date: 20160527 |