RU216595U1 - Blast furnace lance - Google Patents

Abstract

The utility model relates to ferrous metallurgy, in particular to blast furnace lance designs. SUBSTANCE: blast-furnace tuyere contains outer and inner shells, connected at their ends with the nose part and flange, forming a conical blast channel and a cooling circuit, coolant inlet and outlet pipes. The cooling circuit is made in the form of a helical channel with dividing walls located along the entire length of the shells, made with the possibility of directed movement of the coolant. In this case, the number of turns of the screw channel is 18, and the thickness of the channel wall is 2 mm. EFFECT: technical result consists in uniform cooling of the entire body of the lance without the formation of stagnant zones and increasing the stability of the lance. 3 w.p. f-ly, 1 ill.

Description

The utility model relates to ferrous metallurgy, in particular to blast furnace lance designs.

Known blast lance blast furnace [RF Patent No. 2460806, IPC C21B 7/16, publ. 09/10/2012], consisting of a nose part, a body in the form of a conical sleeve with a zigzag hole for supplying and discharging coolant, a flange connected to the pipes for supplying and discharging water and gas supply. All elements are interconnected by permanent connections (welding, soldering, etc.). The lance is made of M1R grade copper.

The disadvantages of this design are:

- the presence of welds, weakening the design of the lance and complicating its manufacture;

- the location of the cooling channels parallel to the generatrix of the conical body, which will lead to uneven cooling along the diameter of the body.

Closest to the claimed utility model in terms of technical essence is the design of the blast furnace lance [Indian patent application No. 09/25/2020], in which the cooling is made in the form of a cavity with a screw channel containing 1.5 turns. There are branch pipes for inlet / outlet of cooling liquid and gas supply. The lance is made of copper.

The disadvantages of this design are:

- production of a lance by the method of shaped casting, which is a difficult-to-control and imperfect process;

- the location of the cooling channels is not throughout the volume of the blast-furnace lance, which will not provide cooling of the entire body.

In addition, in the aforementioned solutions known from the prior art, copper is used as the material of the lance, which has low physical and mechanical properties compared to, for example, steels, which leads to rubbing of the walls of the body and the nose of the lance and, consequently, to a decrease in its service life. , while manufacturing by casting, assembly-welding does not guarantee quality in the mass production of such complex and critical components.

Thus, in the prior art, there is a problem of uniform and efficient cooling of the entire body of the lance, as well as increasing its durability.

The technical result, which the utility model is aimed at, consists in uniform cooling of the entire body of the lance without the formation of stagnant zones and increasing the durability of the lance.

The specified technical result is achieved by the fact that the blast furnace tuyere, containing the outer and inner shells, connected at the ends with the nose part and the flange, forming a conical blast channel and a cooling circuit, coolant inlet and outlet pipes, according to the utility model, contains a cooling circuit, which is made in the form of a helical channel with dividing walls located along the entire length of the shells, made with the possibility of directed movement of the coolant, while the number of turns of the helical channel is 18, and the thickness of the channel wall is 2 mm.

The lance is made in one piece by 3D printing from stainless steel.

The wall thickness of the nose part of the lance is at least 2 mm.

The lance can be made in one piece by 3D printing. This design allows you to further increase the durability of the lance due to the absence of welds, as well as reduce labor intensity and optimize the manufacturing process.

The lance can be made of stainless steel. This design allows you to further increase the durability of the lance due to the high physical and mechanical properties of the steel.

In addition, in the tuyere, the wall thickness of the face part can be at least 2 mm, which makes it possible to withstand mechanical loads on the tuyere and ensure sufficient cooling. A smaller wall thickness will lead to the destruction of the structure and its rubbing by the material deposited in the blast furnace.

In the tuyere, the channel wall thickness is 2 mm. This makes it possible to withstand mechanical loads from the pressure of the coolant. A smaller wall thickness will lead to the destruction of the structure and rubbing by the material deposited in the blast furnace.

In the lance, the number of turns of the screw channel is 18, which are distributed along the entire length of the body, which allows sufficient cooling of the lance. A different number of turns does not provide sufficient heat removal from the walls of the tuyere.

The essence of this utility model is further illustrated by the following graphics (Fig. 1).

The following main elements stand out in the tuyere:

1 - flange;

2 - outer shell;

3 - dividing walls of the screw channel;

4 - inner shell;

5 - screw channel;

6 - snout;

7 - natural gas supply pipe.

The tuyere is designed to supply an air mixture enriched with oxygen and heated to a temperature under pressure into the blast furnace through the central opening.

The lance is manufactured from AISI 316L steel powder up to 200 microns in size using the DMD (Directed Metal Deposition) method - direct surfacing. After 3D printing, the connecting dimensions are processed using standard metal cutting methods.

The length of the lance is 525 mm, the maximum diameter is 383 mm, and the weight is 73.4 kg.

The tuyere is water-cooled, water enters through the coolant supply pipe (not shown in Fig.1) and moves directionally along the cooling circuit in the form of a helical channel (5) with dividing walls (3) under pressure. Additionally, natural gas (7) is supplied under pressure to maintain the combustion process in the blast furnace. External environment - hot air, decomposition products of burning gas (coke, natural gas), possible short-term ingress of molten iron and slag on the surface of the tuyeres.

The cooling system of the lance worked normally: no stagnant zones were found, no boiling of the coolant was noted, the metal elements of the lance did not heat up above 350°C.

Claims (4)

1. Tuyere of a blast furnace, containing outer and inner shells, connected at the ends with the nose part and the flange, forming a conical blast channel and a cooling circuit, coolant inlet and outlet pipes, characterized in that the cooling circuit is made in the form of a helical channel with dividing walls located along the entire length of the shells, made with the possibility of directed movement of the coolant, while the number of turns of the helical channel is 18, and the thickness of the channel wall is 2 mm. 2. A lance according to claim 1, characterized in that it is made in one piece by 3D printing. 3. Lance according to claim 1 or 2, characterized in that it is made of stainless steel. 4. Lance according to claim 1, characterized in that the wall thickness of the nose part is at least 2 mm.

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