RU110311U1 - BUCKET FOR BOTTOM METAL BLOWING WITH GAS IN THE DUCK - Google Patents

Abstract

 A lance for bottom blowing metal gas in a bucket, containing a refractory plug enclosed in a metal shell, through-through longitudinal slotted channels, a lid covering the bottom of the refractory plug with the formation of a cavity communicated with through-through longitudinal slotted channels, a ceramic wear indicator located at the bottom of the refractory plug, gas supply tube, puller and acoustic emitter, exciting elastic acoustic vibrations of the gas, made in the form of a hollow cylinder, closed at the ends of the plates with a hole in the center, and installed in the puller flush with one of the ends with the surface of the lid, while the acoustic emitter, gas supply tube and puller are located coaxially with the refractory plug, characterized in that the refractory plug further comprises a ceramic core, in which through longitudinal slotted channels are made, ceramic the core has at least two transverse protrusions on the surface with a radius of 15-16 mm, and the ceramic wear indicator consists of two halves oppositely conjugated with the surface of the core nical core and having at least two transversal protrusions radius of 5-6 mm on the side interfacing with the refractory stopper.

Description

The utility model relates to metallurgy and can be used for out-of-furnace treatment of steel in a ladle by inert gas purging.

There are known tuyeres for bottom metal purging by gases in a bucket with excitation of acoustic gas vibrations, for example, RU 2238984 С21С 7/072, 2004 [1], RU 2291202 С21С 5/48, 2007 (2006.01) [2], RU 74921 С21С 5/48 , 2008 (2006.01) [3], RU 101038 C21C 5/48, 2011 (2006.01) [4], RU 78798 C21C 5/48, 2008 (2006.01) [5].

The closest in combination of essential features is the lance for bottom blowing RU 78798 С21С 5/48, 2008 (2006.01) [5].

It contains a refractory plug with through longitudinal slotted channels, an acoustic emitter that converts the kinetic energy of the purge gas jet into the energy of acoustic vibrations, made in the form of a hollow cylinder, closed from the ends by plates with a hole in the center and mounted in the puller flush with one of the ends with the surface of a flat cover - a reflector covering the bottom of the refractory plug with the formation of a cavity communicated with through longitudinal slotted channels between the inner surface of the lid and the bottom refractory plugs, ceramic wear indicator, gas supply tube and puller, while the acoustic emitter, gas supply tube and puller are aligned with the refractory plug. Through longitudinal slotted channels are made in circular rows in the concrete body of the refractory plug with the help of embedded channel-forming metal plates removed after heat treatment of the lance. The ceramic wear indicator is made in the form of a truncated cone and is located in the lower part of the refractory plug. The bottom purge lance is a replaceable device that can be replaced after wear of the refractory plug.

A disadvantage of the known lance is the early attenuation of acoustic waves due to energy loss during multiple reflection between the inner surface of the lid and the bottom of the refractory plug and in the through longitudinal slotted channels due to the low purity of their surface, which reduces the purge efficiency, allows the possibility of metal infiltration into the slotted channels and deterioration blowing lances.

The objective of the utility model is to eliminate this drawback and improve the quality of metal processing.

To solve the problem and implement the technical result, according to the utility model, the refractory plug further comprises a ceramic core in which through longitudinal slotted channels are made, the ceramic core has at least two transverse protrusions with a radius of 15-16 mm on the surface, and the ceramic wear indicator consists of two halves oppositely conjugated with the surface of the ceramic core and having at least two transverse protrusions with a radius of 5-6 mm on the side of the interface with the fire body stubborn corks.

The technical result is achieved due to the location of the through longitudinal slotted channels through a ceramic core directly above the acoustic emitter, which eliminates multiple reflection of waves before entering the through longitudinal slotted channels and loss of energy.

The utility model is illustrated by an example of the implementation of the lance, presented in the figure of the drawing. The lance is installed in the bottom of the bucket.

The lance includes a refractory plug 1, a ceramic core 2 with rows of through longitudinal slotted channels 3 and transverse projections 4 on the surface mating with the refractory mass, a ceramic lance wear indicator 5 with transverse projections 6 on the surface, consisting of two halves oppositely mated to the surface ceramic core 2, acoustic emitter 7, cover 8 covering the bottom of the refractory plug 1, gas supply tube 9, puller 10. The transverse protrusions 4 and 6 fix the ceramic core 2 and the ceramic indicator 5 in the body of the refractory plug 1, preventing it from sagging under the weight of the metal. The ceramic lance wear indicator 5 can be made, for example, in the form of a cylinder cut into two parts along the longitudinal axis. Dividing the body of the ceramic wear indicator into two spaced apart halves increases its distinguishability when processing the tuyeres with oxygen after draining the metal from the bucket and increases the safety of using the tuyeres. The ceramic core 2 in cross section may have any shape, but a square shape is preferred for ease of manufacture. Ceramic core 2 is molded from a refractory mass and fired. Through longitudinal slotted channels 3 in the ceramic core 2 are made using embedded channel-forming strips that burn out during firing, which increases the surface cleanliness of the slotted channels, and this, in turn, reduces the energy loss of acoustic waves.

The lid 8 has a flat surface, a refractory stopper 1 rests on it. Between the inner surface of the lid and the bottom of the ceramic core 2 there is a cavity 11 connected to the slotted channels 3. The acoustic emitter 7 is integrated in the puller 10 flush with one of the ends with the surface of the cap 8. The puller 10 designed to remove the tuyere from the bottom of the steel pouring ladle when it is replaced. The lance is enclosed in a metal casing 12. A ceramic core 2, an acoustic emitter 7, a gas supply tube 9 and a puller 10 are located on the axis in the center of the lance.

Tuyere works as follows.

A purge gas at a pressure of 0.8-1.5 MPa is supplied through a gas supply tube 9 to an acoustic emitter 7, exciting acoustic vibrations of the gas, and then to the cavity 11 and the through longitudinal slotted channels 3 of the ceramic core 2. At the exit from the through longitudinal slotted channels 3 the excited gas flow is crushed into bubbles, the optimal diameter of which is given by the size of the slotted channels and the amplitude-frequency characteristic of sound vibrations. The oscillatory movement of the purge gas bubbles in the liquid metal promotes its mixing, homogenization of the composition and degassing, removal of non-metallic inclusions, improving the quality of the metal.

Testing the proposed tuyere in a steel pouring ladle showed its advantage compared to the prototype, since at the same gas flow rate it provides more efficient mixing of the metal due to the conservation of maximum acoustic wave energy. In addition, the proposed tuyere showed better blowing, having worked without comment on the lack of purging or poor purging, which confirms the achievement of the technical result.

Information sources:

1. RU 2238984 C21C 7/072, 2004 [1];

2. RU 2291202 C21C 5/48, 2007 (2006.01) [2];

3. RU 74921 C21C 5/48, 2008 (2006.01) [3];

4. RU 101038 C21C 5/48, 2011 (2006.01) [4];

5. RU 78798 C21C 5/48, 2008 (2006.01) [5].

Claims (1)

A lance for bottom blowing metal gas in a bucket, containing a refractory plug enclosed in a metal shell, through-through longitudinal slotted channels, a lid covering the bottom of the refractory plug with the formation of a cavity communicated with through-through longitudinal slotted channels, a ceramic wear indicator located at the bottom of the refractory plug, gas supply tube, puller and acoustic emitter, exciting elastic acoustic vibrations of the gas, made in the form of a hollow cylinder, closed at the ends of the plates with a hole in the center, and installed in the puller flush with one of the ends with the surface of the lid, while the acoustic emitter, gas supply tube and puller are located coaxially with the refractory plug, characterized in that the refractory plug further comprises a ceramic core, in which through longitudinal slotted channels are made, ceramic the core has at least two transverse protrusions on the surface with a radius of 15-16 mm, and the ceramic wear indicator consists of two halves oppositely conjugated with the surface of the core nical core and having at least two transversal protrusions radius of 5-6 mm on the side interfacing with the refractory stopper.