CN2375641Y

CN2375641Y - Iron melt pretreatment spray gun

Info

Publication number: CN2375641Y
Application number: CN 99227640
Authority: CN
Inventors: 王智
Original assignee: SHANGHAI KAIBAO SPRAY GUN FACTORY
Current assignee: SHANGHAI KAIBAO SPRAY GUN FACTORY
Priority date: 1999-06-21
Filing date: 1999-06-21
Publication date: 2000-04-26
Anticipated expiration: 2009-06-21

Abstract

The utility model relates to a powder blowing spray gun for the pretreatment of desulfurization and dephosphorization in the process of smelting molten iron, which is composed of a steel pipe, wherein, the outer side of which is coated with a refractory material layer. The utility model is characterized in that a cross section of the powder blowing spray gun is a convex polygon; a layer of metal mesh is wound between the steel pipe and the refractory material layer; a blowing end presents a bending shape; a spout of the blowing end presents an elliptical shape. The utility model overcomes the defects of the existing spray gun and has the advantages of light weight, low production cost, long service life, and favorable desulfurization and dephosphorization effects.

Description

Hot metal pretreatment spray gun

The utility model is a kind of spray gun that carries out the used blowing powder of desulfurization dephosphorization pre-treatment in the smelting molten iron process.

The global shape of existing hot metal pretreatment spray gun is the cylindrical of hollow, and the rifle core is a steel pipe, and outer wall of steel pipe welding V-type anchoring piece is wrapped up in refractory materials outward.There are many defectives in the structure of this spray gun and shape: the one,, to make moulding and must adopt vertical casting, generally at 4.5-6 rice, factory building height also increases spray gun length thereupon, and required factory building, facility investment are very big; The 2nd,, when the spray gun oblique cutting in torpedo car when winding-up that fills molten iron, molten iron is forced to form the eddy current that circles round, and molten iron and scum wash away spray gun and make the refractory materials melting loss, in the position melting loss amount maximum that flows in the face of molten iron, because of this spray gun is hollow cylindrical, wall thickness equates everywhere, in case melting loss serious whole spray gun in somewhere will be discarded, is the work-ing life that obtains to grow, common way is to increase wall thickness and cause spray gun weight very big, reaches the 800-950 kilogram and consumes a large amount of refractory materialss; The 3rd,, when jetting operation, spray gun must repeatedly repeat to insert and take out, molten iron and envrionment temperature great disparity, rapid heat cycle causes that steel pipe expands with heat and contract with cold fast, and the coefficient of expansion of refractory materials is far smaller than steel pipe, so, be welded in the refractory materials that the V-type anchoring piece on the steel pipe can externally wrap up in and play destruction, spray gun is very fragile; The 4th,, straight tube winding-up is unfavorable for the molten iron circulation of circling round in torpedo car, pulvis that sprays into and molten iron can not thorough mixing, influence the effect of dephosphorization and desulfurization; The 5th,, spout is a circular hole, can cause the pulvis major part along second position ejection of spout when the low dosage blowing powder because of gaseous tension is constant, first position causes molten iron to reflux melting loss rifle core easily.

The purpose of this utility model is existing hot metal pretreatment spray gun is improved, and overcomes above-mentioned every defective, alleviates spray gun weight, reduces cost of manufacture, increases the service life, improves the desulfurization dephosphorization effect.

The technical solution of the utility model is: a kind of hot metal pretreatment spray gun, and to wrap up in refractory masses outward and constitute by steel pipe, the cross section that it is characterized in that spray gun is a convex polygon.

Bind the layer of steel wire net between steel pipe and the refractory masses.

The winding-up end is bending, and the winding-up end is the 100-145 degree with the span of the bending angle of spray gun.

Be further described below in conjunction with embodiment of the present utility model and accompanying drawing thereof.

Fig. 1 is the structure longitudinal sectional view of present embodiment.

Fig. 2 is a kind of cross-sectional view of the present utility model.

Fig. 3 is an another kind of cross-sectional view of the present utility model.

Hot metal pretreatment spray gun shown in Figure 1 constitutes by wrapping up in refractory masses 2 outside the steel pipe 1, the cross section of spray gun is a convex polygon, the spray gun cross section generally adopts tetragon (as shown in Figure 2), hexagon (as shown in Figure 3), octagonal convex polygon, not more than decagon; Bind layer of steel wire net 3 between steel pipe 1 and the refractory masses 2; Winding-up end 4 is bending, and winding-up end 4 is the 100-145 degree with the span of the bending angle α of spray gun, and preferred span is the 125-135 degree; The spout of winding-up end 4 is ellipticity, oval minor axis in vertical direction, major axis in horizontal direction.

Positively effect of the present utility model finds expression in: the spray gun cross section adopts convex polygon, and practicable horizontal cast molding has reduced the investment of production unit and factory building significantly, has simplified manufacture craft, has reduced cost; The cross section of convex polygon is actually the not design of uniform thickness of a kind of spray gun wall, select one of them corner angle (being the corner angle shown in the A ' among A and the Fig. 3 among Fig. 2) consistent with the blowing direction of winding-up end, when oblique cutting is jetted, these corner angle will in the face of molten iron with the washing away of iron quarrel, these edges and corners have bigger wall thickness to resist to wash away with respect to other position, suitable with the erosion resistibility of the cylindrical spray gun of identical wall thickness, with regard to spray gun generally speaking, reduced the consumption of refractory materials, weight has only 80 kilograms, the refractory materials consumption reduces can make the refractory materials that fuses in the molten iron also reduce thereupon, and the quality of molten iron is improved.The outer woven wire of steel pipe is convenient to adhering to of refractory materials, and when jetting operation, steel pipe expands with heat and contract with cold with spray gun turnover torpedo car, can relatively move between steel pipe and the woven wire, has alleviated the destruction to refractory masses.The end of jetting is bending, makes molten iron form the eddy current that circles round easily, and the pulvis that sprays into mixes with molten iron fully and be even, the better effects if of sloughing phosphorus sulphur.The spout of winding-up end is ellipticity, can prevent from when low dosage dusts that molten iron from pouring in down a chimney steel pipe is damaged.

In sum, the utility model can reach its intended purposes really, alleviates spray gun weight, reduces cost of manufacture, increases the service life, improves the desulfurization dephosphorization effect.

Claims

1. hot metal pretreatment spray gun is wrapped up in refractory masses outward and is constituted by steel pipe, and the cross section that it is characterized in that spray gun is a convex polygon.

2. hot metal pretreatment spray gun according to claim 1 is characterized in that the spray gun cross section is tetragon, hexagon or octagonal convex polygon.

3. hot metal pretreatment spray gun according to claim 1 is characterized in that binding between steel pipe and the refractory masses layer of steel wire net.

4. hot metal pretreatment spray gun according to claim 1 is characterized in that the winding-up end is bending, and the winding-up end is the 100-145 degree with the span of the bending angle of spray gun.

5. hot metal pretreatment spray gun according to claim 4, the preferred span of it is characterized in that jetting end and the bending angle of spray gun is the 125-135 degree.

6. hot metal pretreatment spray gun according to claim 4, the spout of the end that it is characterized in that jetting is ellipticity, oval minor axis in vertical direction, major axis in horizontal direction.