COMBINED BURNER FOR BLOWING OXIDIZING GAS AND FUEL INTO MELTING FURNACE

Abstract

Combined burner for blowing oxidizing gas and fuel into melting furnace, which is fixedly installed into the furnace and provided with outlet apertures for fuel and oxidizing gas, consists, according to this invention, of fixed part (2) of the burner (1) and of a movable nozzle (4), which is rotatably installed inside the body (2.1) of the fixed pan (2) of the burner, supply (7) of the oxidizing gas is connected to the movable nozzle (4) and it is controlled by actuator (3), installed outside of the working space of the furnace, while the axis x2 of the orifice of the movable nozzle (4) is diverted front the rotation axis x1 of the movable nozzle (4) by angle a in the range of 5-60 and the movable nozzle (4) is rotatable around the axis X1 in any direction by angle in the range of 0-180. The movable nozzle allows directing blown gases into various places in the furnace. At the same time, the whole burner is fixedly installed in the wall or ceiling, or the cover of the furnace, and the space of the furnace thus remains sealed.

Claims

1-5. (canceled)

6. A combined burner for blowing oxidizing gas and fuel into a melting furnace, the combined burner being fixedly installed into the melting furnace and being provided with outlet apertures for fuel and oxidizing gas, wherein the burner comprises: a fixed part; and a movable nozzle, the movable nozzle having outlets for both fuel and oxidizing gas, wherein the movable nozzle is rotatably installed inside a body of the fixed part of the burner, wherein a supply of the oxidizing gas is connected to the movable nozzle and motion of the movable nozzle is controlled by an actuator, installed outside of a working space of the melting furnace, wherein an axis x.sub.2 of an orifice of the movable nozzle is diverted from a rotation axis x.sub.1 of the movable nozzle by angle in the range of 5-60, and the movable nozzle is rotatable around the rotation axis x.sub.1 in any direction by an angle in the range of 0-180.

7. The combined burner according to claim 6, wherein the furnace is an electric arc furnace.

8. The combined burner according to claim 6, wherein the burner is placed in a wall or ceiling of the furnace.

9. The combined burner according to claim 6, wherein the body of the fixed part of the burner is installed in an outer fixed housing cooled by liquid or gas, and the body protrudes into a space of the furnace by a distance a.sub.1 in the range of 0-2000 mm.

10. The combined burner according to claim 6, wherein the movable nozzle is provided at the outlet with at least one aperture for oxidizing gas and with apertures for fuel.

11. The combined burner according to claim 7, wherein the burner is placed in a wall or ceiling of the furnace.

12. The combined burner according to claim 7, wherein the body of the fixed part of the burner is installed in an outer fixed housing cooled by liquid or gas, and the body protrudes into the space of the furnace by a distance a.sub.1 in the range of 0-2000 mm.

13. The combined burner according to claim 8, wherein the body of the fixed part of the burner is installed in an outer fixed housing cooled by liquid or gas, and the body protrudes into the space of the furnace by a distance a.sub.1 in the range of 0-2000 mm.

14. The combined burner according to claim 7, wherein the movable nozzle is provided at the outlet with at least one aperture for oxidizing gas and with apertures for fuel.

15. The combined burner according to claim 8, wherein the movable nozzle is provided at the outlet with at least one aperture for oxidizing gas and with apertures for fuel.

16. The combined burner according to claim 9, wherein the movable nozzle is provided at the outlet with at least one aperture for oxidizing gas and with apertures for fuel.

Description

LIST OF FIGURES ON THE DRAWING

[0011] An example embodiment of the combined burner for blowing oxidizing gas and fuel into the melting furnace including actuator is depicted at FIG. 1, its detail D1FIG. 2shows the orifice of the burner.

[0012] FIG. 3 presents the turning of the internal movable nozzle.

[0013] FIG. 4 is a plan view showing the installation of the burner in the furnace and the positions of gas jets in three different situations.

[0014] FIG. 5 shows the installation of the burner and positions of gas jets in three different situations in side section.

EXAMPLES OF THE INVENTION

[0015] Combined burner 1 consists of a fixed part 2, whose main part consists of a body 2.1. Movable nozzle 4 is rotatably installed inside the body 2.1. Body 2.1 is provided with protective outer housing 2.4, fixedly connected with wall 5 or cover 6 or the ceiling of the furnace. Outside fixed housing 2.4 is cooled by liquid or gas, which are forced into the channels 2.5, created in the outside housing 2.4. The body 2.1 of the burner is also provided with cooling channels 2.7 for cooling the face of the burner by liquid or gas. Wall 5 of the furnace can consist of cooled panels, or could be made of refractory material. Oxidizing gas is brought to the movable nozzle 4 by the inlet 7 and fuel is brought to the fixed part 2 of the burner by inlet 8. The burner is installed such that the orifice of the burner is in the distance a.sub.1 from the wall 5 of the furnace. The distance a.sub.1 is chosen so that the jet of gases from the burner doesn't collide with the lining of the furnace. The body 2.1 of the fixed part 2 of the burner is protruding into the space of the furnace from the wall 5 by the distance a.sub.1, in this case 800 mm long. Movable nozzle 4 is controlled by an actuator 3, installed outside of the working space of the furnace and it is rotatable around the rotation axis x.sub.1 in any direction by the angle , in this case 70. Axis x.sub.2 of the orifice of the movable nozzle 4 is diverted from the rotation axis x.sub.1 of the movable nozzle 4 by the angle , in this case 30. Turned positions of the movable nozzle 4 are marked by working positions A, B and C. When the movable nozzle 4 is turned by the angle beta , the jet of gases blown by the fixed part 2 of the burner into the furnace is moved to the position B, respective to the position C when turned in the other direction. The working range of the burner is thus anywhere between the positions B and C, middle position is marked as position A.

[0016] Outside cover 2.4 around the body 2.1 of the burner has a rugged design resistant to high temperature and mechanical damage by the charge of the furnace. Outside housing 2.4 is liquid cooled according to the example embodiment, or it could be manufactured from refractory material.

[0017] The movable nozzle 4 contains aperture 4.1, through which the oxidizing gase.g. oxygenflows and the fuele.g. natural gasflows through other apertures 4.2. The movable nozzle is installed in bearing 2.6 or rotatable housing with apertures for the flow of fuel. The fuel also flows through apertures 2.2, created in the body 2.1 of the fixed part of burned 2. Fuel and oxidizing gas are mixed together in the mixing space 2.3 in the body 2.1 of the fixed part. The aperture 4.1 of the movable nozzle 4 is in the shape of Laval's nozzle for obtaining supersonic speed of the oxidizing gas. Aperture 4.1 with the axis x.sub.2 is inclined under angle from the axis x.sub.1, which is the rotation axis of the movable nozzle 4.

[0018] When the movable nozzle 4 rotates around the axis x.sub.1 by the angle , the jet of gases flowing through the aperture 4.1 with axis x.sub.2 flows into various places of the furnace, depending on the angle of diversion from the vertical plane. The angle can be up to the range of 180. For different types of applications, it is possible to interchange the apertures for the flows of fuel and oxidizing gas, for creating various types of flame. This means that the fuel could flow through the aperture 4.1 and oxidizing gas through the apertures 4.2.

[0019] The motion of the movable nozzle 4 is provided using actuator 3, which is installed on the furnace, or it could be connected to the fixed part 2 of the burner. Actuator 3 can be powered by an electric motor with gearing, hydraulically, pneumatically or in another way, it isn't important from the point of view of the function of the burner.