CN2603810Y

CN2603810Y - Oxygen spray pistol of revolving furnace

Info

Publication number: CN2603810Y
Application number: CN 03228985
Authority: CN
Inventors: 石洪志
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2003-02-24
Filing date: 2003-02-24
Publication date: 2004-02-18
Anticipated expiration: 2013-02-24

Abstract

A BOF lance nozzle includes the nozzle body on which a plurality of orifices are arranged. The orifices are at an angle Alpha to the axis of the nozzle body and also at an angle Beta to the axis plane of the nozzle body. The advantage of the utility model is the angle Beta makes oxygen jet gain tangential energy when oxygen jet into the slag surface, so improves the stirring between the slag and the molten steel. And because of the angle between the oxygen and the slag plane, the contact area increases, so slag melting is improved and reduces the splash.

Description

Oxygen Lance Nozzle for Converter

Technical field

The utility model relates to converter steelmaking in the ferrous metallurgy, particularly the improvement of Oxygen Lance Nozzle for Converter.

Background technology

The oxygen lance blow head that converter current steel-making is adopted according to differences such as converter tonnages, generally adopt 3～6 hole convergent-divergent channel supersonic flow designs, and each orifice center line all is to become certain included angle with the shower nozzle medullary ray.The shower nozzle principal mode comprises head body 10 as shown in Figure 1 and Figure 2, has several spray orifices 20 on it; Spray orifice 20 is evenly arranged (also have and be provided with a spray orifice on the shower nozzle medullary ray) on head body 10 same circumference, the spray orifice 20 on this circumference becomes identical angle with shower nozzle 10 body axis; Its spray orifice 20 medullary rays and head body 10 medullary rays are all in same plane.Behind the multiple jets ejaculation shower nozzle, owing to there is certain suction function each other, last each stream thigh almost is by the slag steel face in the converter of vertical direction directive.

The problem that prior art exists:

I. the stirring between slag and the molten steel is very important smelting factor in the converter smelting, but oxygen rifle energy of the impinging jet has only about 10% to be used to agitation molten pool at present.Top bottom compositing blowing steelmaking technology mainly stirs and develop in order to strengthen the molten bath, but owing to reasons such as itself technology and equipment maintenance, bottom tuyere life-spans, often stove is used as a servant and realized top bottom blowing effectively entirely.So the jet of top oxygen gun just more seems very important to steel, slag stirring action, but top rifle stirring at present can be not enough;

Ii. because vertical fluid and slag, steel contact interface are less, converter slag and dephosphorization effect have been influenced to a certain extent;

Iii. because the oxygen jet of shower nozzle substantially with vertical directive molten bath, so the splash of steel, slag is bigger, causes the difficulty of recovery rate of iron decline and maintenance of the equipment;

Summary of the invention

For overcoming defective of the prior art, the purpose of this utility model is to design a kind of Oxygen Lance Nozzle for Converter, can improve whipping performance and the change slag performance of shower nozzle jet to slag, steel, and can reduce splash.

For achieving the above object, the Oxygen Lance Nozzle for Converter of the utility model design comprises head body, has several spray orifices on it; Described spray orifice and the head body axis α that has angle, and, described spray orifice and the head body axis plane β that also has angle.

The angle α of described spray orifice and head body axis is 5 °～30 °, and the angle β of spray orifice and head body axis plane is 5 °～30 °.

Advantage of the present utility model:

Oxygen Lance Nozzle for Converter of the present utility model, because the existence of shower nozzle end face angle between spray orifices β, make when oxygen jet is injected the top of the slag, produce the tangential energy that divides, improved the stirring between slag and the molten steel greatly, because the stream thigh has certain angle with the top of the slag, contact area increases simultaneously, can the improvement slag, reduce splash.

Description of drawings

Fig. 1 is the cross-sectional schematic of overlooking of existing oxygen lance blow head.

Fig. 2 is the A-A cross-sectional schematic of Fig. 1.

Fig. 3 is the cross-sectional schematic of overlooking of the present utility model.

Fig. 4 is the B-B cross-sectional schematic of Fig. 3.

Fig. 5 is a jet nozzle angle synoptic diagram of the present utility model.

Embodiment

See also Fig. 3,4, the embodiment that it is depicted as the utility model Oxygen Lance Nozzle for Converter comprises head body 1, has several spray orifices 2 on it; Described spray orifice 2 and the head body 1 axis α that has angle, described spray orifice 2 and the head body 1 axis plane β that also has angle; Several 4 of spray orifice, shower nozzle outer diameter D=140mm, spray orifice throat diameter φ ₁Be 34mm, spray orifice exit diameter φ ₂Be 36mm.4 spray orifices 2 are uniform in head body 1 end face equal circumference, are 13 degree with head body 1 axis angle α, and spray orifice 2 is 13 degree with head body 1 axis plane angle β.

See also Fig. 5 again, it illustrates jet nozzle angle of the present utility model and changes synoptic diagram, plane ABC is the axis plane of head body 1, existing spray orifice 20 and the head body 1 axis BO α that has angle, spray orifice of the present utility model 2 and the head body 1 axis BO α that has angle, and become angle β with head body 1 axis plane ABC.

Because the existence of shower nozzle end face angle between spray orifices β makes when oxygen jet is injected the top of the slag, produce the tangential energy that divides, improved the stirring between slag and the molten steel greatly, because the stream thigh has certain angle with the top of the slag, contact area increases simultaneously, can the improvement slag, reduce splash.

Claims

1. Oxygen Lance Nozzle for Converter comprises head body, has several spray orifices on it; Described spray orifice and the head body axis α that has angle is characterized in that, described spray orifice and the head body axis plane β that also has angle.

2. Oxygen Lance Nozzle for Converter as claimed in claim 1 is characterized in that, the angle α of described spray orifice and head body axis is 5 °～30 °.

3. Oxygen Lance Nozzle for Converter as claimed in claim 1 is characterized in that, the angle β of described spray orifice and head body axis plane is 5 °～30 °.