CN2923725Y

CN2923725Y - Novel KR desulfurizing agitator

Info

Publication number: CN2923725Y
Application number: CN 200620095492
Authority: CN
Inventors: 欧阳德刚; 胡清明; 罗安智; 胡铁山; 李具中; 刘守堂; 王海青; 朱善合; 周明石
Original assignee: WUHAN HONGDI ENERGY SAVING MATERIAL CO Ltd; Wuhan Iron and Steel Group Corp
Current assignee: WUHAN HONGDI ENERGY SAVING MATERIAL CO Ltd; Wuhan Iron and Steel Group Corp
Priority date: 2006-03-07
Filing date: 2006-03-07
Publication date: 2007-07-18
Anticipated expiration: 2016-03-07

Abstract

The utility model relates to a KR desulfurization agitator outside the hot metal furnace before converter steelmaking which is to solve the shortages of the existing technology of the poor physical and chemical performance compatibility between the metal stirring core and refractory liner body, the concentration of local thermal stress and short life service,etc. The solving technical measure is: a new model KR desulfurization agitator mianly comprises a refractory liner body(1), forced air cooled tube(2), metal agitating shaft(3) which is provided inside the refractory liner body(1) and is connected with the forced air cooled tube(2), the metal agitating blade(4) which is welded on the lower end of metal agitating shaft(3) and the rivet firmware(5) which is welded on the metal agitating shaft(3) and metal agitating blade(4). It lies in that the piend boundary of the metal agitating blade(4) touching the refractory liner body(1) is a circular arc. The agitator can reduce the problem of the concentration of thermal stress and alleviate the thermal expansion difference between the metal stirring core and refractory liner body, and improve the force uniformity of refractory liner body.

Description

Novel KR desulfur agitator

Technical field

The utility model relates to the agitator of the outer KR desulfurization of the preceding molten iron stove of converter steelmaking, specifically a kind of pretreated agitator of iron ladle KR stirring desulphurization that is used for.

Background technology

At present, the employed agitator of KR stirring desulphurization pre-treatment mainly stirs core by metal outside the molten iron stove before the metallurgy industry converter steelmaking, forced air cooled tube and three parts of refractory materials lining body are formed, wherein, it is by the metal stir shaft that metal stirs core, metal paddle and metal riveting component constitute, the metal stir shaft is a 35CrMo alloy thick-walled tube, the metal paddle is the Q235 plate of moderate thickness, the metal riveting component is the Y shape structure that common wire rod is pieced together knot, refractory materials lining body thickness is looked concrete position different distributions in 70～120mm scope, refractory materials lining body material commonly used is the mullite corundum pouring material, and refractory materials lining body is to take integrated poured mode moulding.Adopt Y shape riveting component reinforced metal to stir core and serve as a contrast combining between the body with refractory materials.Its weak point is:

1, the physicochemical property consistency is relatively poor between metal stirring core and the refractory materials lining body, and the difference of hot expansibility has worsened refractory materials lining body force-bearing situation especially between the two, has advanced the damaged process of agitator;

2, between metal paddle and the refractory materials lining body for corner angle combine, cause the localized heat stress concentration, aggravated the local damage of agitator, this also is the major cause that the agitator breakage mainly appears at the paddle position;

3, the Y shape riveting component even transmission of weld bonding state and agitator torque power that weakened has reduced metal on the one hand and has stirred core and refractory materials and serve as a contrast the bonding strength between the body and the overall performance of agitator; Simultaneously, the inhomogeneous transmission of torsional forces, cause refractory materials lining body local pressure to be concentrated, cause the stressed breakage of local lining body, cause serving as a contrast between body and the riveting component and produce the gap, aggravated the formation of lining body localized cracks and the ablation of riveting component, even caused high temperature liquid iron and slag to invade metal stirring core, caused that stirring core ablates along riveting component ablation residual pores.

4, since molten iron and slag along the rapid osmotic of refractory materials lining body crackle, the erosive velocity of having aggravated refractory materials lining body causes serving as a contrast the structure spalling of body, What is more, causes that metal stirs the ablation of core, thereby, shortened work-ing life of agitator.

5, the mean life of KR agitator short, average work-ing life is about 300 times/.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of thermal stresses that reduces to concentrate, relax metal and stir the novel KR desulfur agitator that core and refractory materials serve as a contrast thermal dilation difference and long service life between the body.

Realize the technical measures of above-mentioned purpose: novel KR desulfur agitator, mainly by refractory materials lining body (1), forced air cooled tube (2), be located in the refractory materials lining body (1) and the metal stir shaft (3) that is connected with forced air cooled tube (2), the metal paddle (4) that is welded in metal stir shaft (3) lower end, the riveting component (5) that is welded on metal stir shaft (3) and the metal paddle (4) are formed, its corner angle limit that is to serve as a contrast with refractory materials the metal paddle (4) that body (1) contacts is a circular arc.

It is that riveting component (5) is a v-shaped structure.

It is at metal stir shaft (3) and metal paddle (4) surface applied organic coating (6).

Advantage of the present utility model:

1, improves the force-bearing situation of refractory materials lining body under the KR agitator working conditions, delayed lining body crackle effectively and formed and tempo, dwindled the crack length and the width of lining body significantly, reduced the structure spalling degree that causes serving as a contrast body because of crackle;

2, riveting component change shape, strengthened the bonding strength that metal stirs core and refractory materials lining body, improved that the riveting component torsional forces transmits with the stressed homogeneity of lining body, improved the whole erosion resistibility of agitator, the process of having checked the riveting component ablation;

3, by changing the paddle property at parts of edges and corners into the rounding off face, reduced the stress concentration degree of former property at parts of edges and corners, improved the stressed homogeneity of refractory materials lining body, delayed the process of agitator local damage, reduced the agitator local damage and caused the whole possibility that stops use of agitator;

4, by be coated with the volatilization of organic coating and organic coating at metal stirring wicking surface at the agitator bake process, form tiny gap with refractory materials lining body bonding surface in that agitator is metal-cored, absorb the swell increment difference that hot expansibility difference between the two causes by tiny gap, reduced the thermal expansion external force of refractory materials lining body, improved the force-bearing situation of lining body, alleviated of the influence of thermal expansion external force the breakage of lining body.

Description of drawings

Fig. 1 is the structural representation of novel KR desulfur agitator

Fig. 2 is an A-A cross-sectional view among Fig. 1

Fig. 3 is a V-arrangement riveting component structural representation

Among the figure: 1 refractory materials lining body, 2 forced air cooled tubes, 3 metal stir shafts, 4 metal paddles, 5V shape riveting component, 6 organic coatings

Embodiment

Be described in further detail below in conjunction with accompanying drawing:

Embodiment 1: adopt the 35CrMo thick-walled seamless steel pipes, No. 45 weldless steel tubes, raw material metal such as Q235 plate of moderate thickness and plain carbon stool Twisted Steel and mullite corundum pouring material have been made the composition of a novel KR desulfur agitator, and its structure is: refractory materials lining body (1), forced air cooled tube (2), be located in the refractory materials lining body (1) and with forced air cooled tube (2) be the metal stir shaft (3) of 60 ° V-arrangement riveting component (5) welding by angle, the metal paddle (4) that is welded in metal stir shaft (3) lower end is that 60 ° V-arrangement riveting component (5) is fixing with refractory materials lining body (1) by angle.The corner angle limit of the metal paddle (4) that contacts with refractory materials lining body (1) is a circular arc.At metal stir shaft (3) and metal paddle (4) surface applied organic coating (6).Wherein, angle is that 60 ° V-arrangement riveting component (5) is the plain carbon stool Twisted Steel of 10mm for diameter, and angle is that 60 ° V-arrangement riveting component (5) arrangement pitch is 75mm, and the material of other metal parts is identical with conventional KR desulfur agitator.Refractory materials lining body (1) adopts refractory castable to carry out integrated poured moulding.The agitator of making drops into test in place through toasting after, reach 770 times/the work-ing life of test agitator, with 400 times of commonly used KR desulfur agitator mean life/prop up and compare, 0.92 times of raising work-ing life.

Embodiment 2:

Its agitator structure is constant.Adopt No. 15 carbon steel seamless tubes to make forced air cooled tube (2), the 35CrMo thick-walled seamless steel pipes is made metal stir shaft (3), it with common cold-drawn external fin reinforcement fabrication angle 60 ° V-arrangement riveting component (5), angle is 60 ° V-arrangement riveting component (5) arrangement pitch 80mm, make metal paddle (4) with the 100mm Plate Steel, and circular arc is processed on metal paddle (4) the corner angle limit that contacts with refractory materials lining body (1).At metal stir shaft (3) and metal paddle (4) surface applied organic coating (6).Refractory materials lining body (1) adopts refractory castable to carry out integrated poured moulding.Behind overbaking, to test in KR stirring desulphurization production scene, be 737 times/the work-ing life of agitator test, compares with 400 times/of KR desulfur agitator mean life of routine, improves 0.84 times of work-ing life.

Claims

1, novel KR desulfur agitator, mainly by refractory materials lining body (1), forced air cooled tube (2), be located in the refractory materials lining body (1) and the metal stir shaft (3) that is connected with forced air cooled tube (2), the metal paddle (4) that is welded in metal stir shaft (3) lower end, the riveting component (5) that is welded on metal stir shaft (3) and the metal paddle (4) are formed, the corner angle limit that it is characterized in that serving as a contrast with refractory materials the metal paddle (4) that body (1) contacts is a circular arc.

2, novel KR desulfur agitator according to claim 1 is characterized in that riveting component (5) is a v-shaped structure.

3, novel KR desulfur agitator according to claim 1 is characterized in that at metal stir shaft (3) and metal paddle (4) surface applied organic coating (6).