CN102191346B - Combined tuyere small sleeve - Google Patents

Abstract

The invention discloses a combined tuyere small sleeve, comprising: a central sleeve, an inner sleeve, a first sleeve, a second sleeve, and a third sleeve, and the central sleeve is fixedly sleeved with the inner sleeve to form an oxygen-coal medium channel; the gap between the first casing and the central casing forms a cooling water inlet channel, the gap between the second casing and the first casing forms a gas medium channel, and the gap between the third casing and the second casing The cooling water return channel is formed in the gap between the cooling water inlet channel and the cooling water return channel. At the end of the cooling water inlet channel and the cooling water return channel away from the water inlet and the return port, there are fixedly connected front caps and rear caps with an integrated structure. The cooling water inlet channel and the cooling water return channel The water channel communicates with the front cap and the rear cap to form a cooling water circulation channel; an oxygen-coal medium outlet and a gas medium outlet are opened on the front cap. The invention has the advantages of simple structure, good cooling effect, reliability and safety, and long service life.

Description

A small combined air outlet

technical field

The invention relates to a pure oxygen blast furnace or smelting reduction furnace equipment, in particular to a combined tuyere small sleeve for a pure oxygen ironmaking furnace.

Background technique

As we all know, in the field of ironmaking, the tuyere sleeve is an indispensable and important part in the traditional ironmaking blast furnace or non-blast furnace, and the quality and performance of the tuyere sleeve directly affect the normal operation and work in the smelting process efficiency. Under actual working conditions, the working conditions of the small tuyere sleeve are harsh, and the thermal corrosion is serious, resulting in serious burning of the small tuyere sleeve and short service life. Moreover, for the traditional tuyeres, there are also great limitations on the blowing medium.

In view of the shortcomings of the above-mentioned prior art, the inventor actively improved and innovated based on relevant design, field experience and professional knowledge, in order to realize a combined tuyere cover. The tuyere small sleeve has the advantages of simple structure, good cooling effect, reliability and safety, and guaranteed service life. And through the small tuyere, not only can pulverized coal and pure oxygen be injected, but also other gas media with high pressure and high temperature can be injected into the furnace, such as coal gas, compressed air or steam, etc., which can improve the small tuyere. Set of air supply function.

Contents of the invention

The object of the present invention is to provide a small combined tuyere sleeve with simple structure, good cooling effect, reliability and safety, and long service life. Inject other gaseous media with high pressure and high air temperature to improve the air supply function of the tuyere sleeve, reduce the theoretical combustion temperature in front of the tuyere, reduce the probability of the tuyere sleeve being burned out, and further increase the service life of the tuyere sleeve.

In order to achieve the above purpose, the present invention proposes a combined tuyere cover, including:

A central sleeve, one end of the central sleeve is provided with an oxygen-coal medium inlet, and the other end is fixedly sleeved with an inner sleeve, and the central sleeve communicates with the inner cavity of the inner sleeve to form an oxygen-coal medium channel;

The first sleeve is sleeved on the outside of the central sleeve, the gap between the first sleeve and the central sleeve forms a cooling water inlet channel, and the first sleeve is close to the oxygen coal There is a water inlet on one side of the medium inlet;

The second sleeve is L-shaped, and the second sleeve is partially sleeved on the outside of the first sleeve, and the gap between the second sleeve and the first sleeve forms a gas medium channel. A gas medium inlet is provided on the side of the first casing near the oxygen-coal medium inlet;

The third sleeve is sleeved on the outside of the second sleeve, and the gap between the third sleeve and the second sleeve forms a cooling water return channel. There is a water return port on the side of the coal medium inlet;

A front cap and a rear cap of an integral structure are fixedly connected to the end of the cooling water inlet channel and the cooling water return channel away from the water inlet and the water return port, and the cooling water inlet channel is connected to the cooling water return channel. The cooling water return channel is connected through the front cap and the rear cap to form a cooling water circulation channel;

An oxygen-coal medium outlet connected to the oxygen-coal medium channel is opened on the front cap; and a gas medium outlet connected to the gas medium channel is also opened on the front cap.

As for the combined tuyere cover described above, a deflector is provided on the side of the cooling water circulation channel close to the front cap, and the deflector includes a plurality of deflectors, and the deflectors are staggered and arranged at intervals on both side walls of the cooling water circulation channel, one end of each deflector is welded to one side wall of the cooling water circulation channel, the other end of the deflector is connected to the The other side wall of the cooling water circulation channel has a prescribed distance.

As for the combined tuyere cover above, the flow guiding device is provided on the side of the cooling water inlet channel close to the front cap.

As for the combined tuyere cover described above, the flow guiding device is provided on the side of the cooling water return channel close to the front cap.

The combined tuyere cover above, wherein the deflector includes 3 to 6 deflectors.

The combined tuyere kit as described above, wherein the deflector is a stainless steel deflector.

The combined tuyere kit as described above, wherein the oxygen-coal medium outlet is opened at the center of the front cap, and a plurality of circular hole-shaped gas medium outlets are opened on the front cap along the circumference. exit.

The combined tuyere cover above, wherein, the front cap is formed by extrusion casting of pure copper, and the rear cap is formed by casting of boiler steel.

The small combined tuyere sleeve as described above, wherein, the central sleeve, the inner sleeve, the first sleeve, the second sleeve and the third sleeve are all stainless steel sleeves.

Compared with the prior art, the present invention has the following characteristics and advantages:

1. The present invention has independent oxygen-coal medium channels and gas medium channels. In the pure oxygen non-blast furnace ironmaking process, when the oxygen-coal medium is injected into the furnace through the tuyere equipment, high-pressure and high-temperature gas can be injected at the same time. The medium improves the combustion efficiency, reduces the theoretical combustion temperature in front of the tuyere, reduces the chance of burning out the tuyere sleeve, and increases the service life of the tuyere sleeve.

2. The present invention can reduce the coke ratio during industrial smelting and reduce the production cost by spraying high-pressure and high-temperature gas medium into the furnace.

3. The small tuyere sleeve of the present invention can operate safely and reliably under quite severe conditions when pulverized coal, oxygen, and high-pressure, high-temperature gas medium are sprayed at the same time, providing a strong guarantee for continuous smelting operations, and has a good use value.

4. In the present invention, a diversion device is provided at the front end of the cooling water circulation channel close to the small tuyere, so that the cooling water generates a swirling flow when flowing through the place, avoiding the cooling water flow dead zone in the small tuyere, and improving the small tuyere. Sets the role of the cooling effect.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

Fig. 1 is the structural representation of the combined tuyere cover of the present invention;

Fig. 2 is a schematic diagram of the cross-sectional structure along the A-A direction of Fig. 1;

Fig. 3 is a schematic structural view of the flow guiding device of the present invention.

Explanation of reference signs:

1-central sleeve; 2-first sleeve; 3-second sleeve; 4-third sleeve; 5-inner sleeve; 6-front cap; 7-back cap;

11-oxygen coal medium channel; 12-oxygen coal medium inlet; 13-oxygen coal medium outlet; 21-cooling water inlet channel; 22-water inlet; 31-gas medium channel; 32-gas medium inlet; 33-gas medium Outlet; 41-cooling water return channel; 42-backwater outlet; 8-cooling water circulation channel; 9-guiding device; 91-deflector; 10-swirl channel.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a schematic structural diagram of the combined tuyere cover of the present invention. As shown in the figure, the combined tuyere sleeve proposed by the present invention includes a central sleeve 1, a first sleeve 2, a second sleeve 3, a third sleeve 4, an inner sleeve 5, a front cap 6 and a rear cap 7, One end (rear end) of the central casing 1 is provided with an oxygen-coal medium inlet 12 for inserting an oxygen-coal spray gun (not shown in the figure), and the pulverized coal is transported through the spray gun, and the other end (front end) of the central casing 1 is ) is fixedly connected with an inner sleeve 5, and the central sleeve 1 communicates with the inner cavity of the inner sleeve 5 to form an oxygen-coal medium channel 11. In the present invention, the outlet end of the oxygen-coal medium is set as the front end of the small tuyere sleeve, and its inlet end is set as the rear end of the small tuyere sleeve. The oxygen-coal medium channel 11 extends to the outlet at the front end of the small tuyere sleeve, and pure oxygen is transported in the annular channel formed by the spray gun and the inner sleeve 5 . The first sleeve 2 is sleeved on the outside of the central sleeve 1, and the gap between the first sleeve 2 and the central sleeve 1 forms a cooling water inlet channel 21. A water inlet 22 is opened on the side of the pipe 2 close to the oxygen-coal medium inlet 11, and cooling water is injected into the cooling water inlet channel 21 through the water inlet 22, and flows to the front end of the small tuyere sleeve. The second sleeve 3 is L-shaped, and the second sleeve 3 is partially sleeved on the outside of the first sleeve 2, and the gap between the second sleeve 3 and the first sleeve 2 forms A gas medium channel 31 is provided with a gas medium inlet 32 on the side of the first casing 2 close to the oxygen-coal medium inlet 12, so that gas medium (such as various gases such as coal gas, compressed air or steam) can pass through The gas medium inlet 32 enters the gas medium channel 31 and flows to the outlet at the front end of the small tuyere sleeve. The third sleeve 4 is sleeved on the outside of the second sleeve 3, and the gap between the third sleeve 4 and the second sleeve 3 forms a cooling water return channel 41. A water return port 42 is provided on the side of the casing 4 close to the oxygen-coal medium inlet 32. After the cooling water passes through the front end of the small tuyere sleeve, it can pass through the cooling water return channel 41 and then be discharged from the return water port 42. A front cap 6 and a rear cap 7 of an integral structure are fixedly connected to one end of the cooling water inlet channel 21 and the cooling water return channel 41 away from the water inlet 22 and the water return port 42 , and the cooling water The water inlet channel 21 communicates with the cooling water return channel 41 through the front cap 6 and the rear cap 7 to form a closed cooling water circulation channel 8, so that the cooling water can flow through the water inlet 22 and the cooling water inlet channel in sequence 21. The front cap 6, the rear cap 7, the cooling water return channel 41, and the return water port 42, thereby realizing the cooling function of the cooling water. An oxygen-coal medium outlet 13 communicating with the oxygen-coal medium channel 11 is opened on the front cap 6, so that the oxygen-coal medium can be ejected from the oxygen-coal medium outlet 13; and an oxygen-coal medium outlet 13 is opened on the front cap 6 There is a gas medium outlet 33 communicating with the gas medium channel 31 . It can be known from the above that the present invention has independent oxygen-coal medium passages and gas medium passages. During the pure oxygen non-blast furnace ironmaking process, when the oxygen-coal medium is injected into the furnace through the tuyere equipment, high pressure and high air temperature can be injected simultaneously. The gas medium improves the combustion efficiency, reduces the theoretical combustion temperature in front of the tuyere, reduces the probability of burning out the tuyere sleeve, and increases the service life of the tuyere sleeve. Moreover, it can reduce the coke ratio during industrial smelting and reduce the production cost. At the same time, the small tuyere sleeve of the present invention can operate safely and reliably under relatively severe conditions, thereby providing a strong guarantee for continuous smelting operations and having good use value.

Further, a flow guiding device 9 is provided on a side of the cooling water circulation channel 8 close to the front cap 6 . Please refer to FIG. 3 together, which is a schematic structural view of the flow guide device of the present invention. The flow guide device 9 includes a plurality of flow guide plates 91, and the flow guide plates 91 are arranged in the cooling water circulation channel 8 alternately and at intervals. More specifically, one end of each deflector 91 is welded to the side wall of the cooling water circulation channel 8, and the other end of the deflector 91 is connected to the cooling water circulation channel The other side wall of 8 has a prescribed distance, so that a swirl channel 10 is formed at the cooling water circulation channel 8 near the front end of the small tuyere sleeve. Under the action of 91, it flows in a swirling direction, thereby avoiding the cooling water flow dead zone in the small tuyere sleeve, and improving the cooling effect of the small tuyere sleeve. In this implementation, the flow guide device 9 is arranged on the side of the cooling water inlet channel 21 and the cooling water return channel 41 close to the front cap, but it is not limited thereto, and the flow guide device 9 can also be used alone It is arranged on the side of the cooling water inlet channel 21 or the cooling water return channel 41 close to the front cap 6, as long as it can avoid the cooling water flow dead zone in the tuyere sleeve and improve the cooling effect of the tuyere sleeve That's it.

Further, the deflector 9 includes 3 to 6 deflectors 91 , so as to ensure the swirling flow generated when the cooling water flows through the deflector 9 .

Further, the deflector 91 is a stainless steel deflector, thereby ensuring the strength and corrosion resistance of the deflector.

Further, as shown in Figure 2, the oxygen-coal medium outlet 13 is set at the center of the front cap 6, and a plurality of circular hole-shaped gas medium outlets are opened on the front cap 6 along the circumference. Exit 33. In this way, when the oxygen-coal medium is sprayed into the iron-smelting furnace through the oxygen-coal medium outlet 13, the gas medium with high pressure and high wind temperature can be sprayed into the iron-smelting furnace at a high speed through a plurality of gas medium outlets 33, so as to regulate the furnace during the smelting process. conditions, save coke, and improve production efficiency.

Further, the front cap 6 is formed by extrusion casting of pure copper, while the rear cap 7 is formed by casting of boiler steel. The front cap 6 and the rear cap 7 are welded into one structure, which reduces the amount of copper used and the manufacturing cost.

Further, the central sleeve 1, the inner sleeve 5, the first sleeve 2, the second sleeve 3 and the third sleeve 4 are all made of stainless steel sleeves, thereby further reducing the amount of copper used and reducing the manufacturing cost. cost.

When in use, after the oxygen coal gun is installed on the oxygen coal medium inlet 12 of the tuyere small sleeve of the present invention, the annular seam formed by the inner sleeve 5 and the oxygen coal gun is used for injecting oxygen, and the oxygen and the pulverized coal to be injected are all from the oxygen coal The medium outlet 13 sprays into the iron-making furnace; the cooling water that enters the tuyere from the water inlet 22 flows in the cooling water inlet channel 21, and the cooling water passes through the deflector 91 of the deflector 9, and then passes through the cooling water return The water channel 41 finally flows out from the water return port 42, thereby realizing the purpose of cooling the small tuyere sleeve through the rapid flow and heat exchange process of cooling water; at the same time, the gas medium with high pressure and high wind temperature enters the small tuyere from the gas medium inlet 32 The gas medium flows in the gas medium channel 31, and the gas medium is ejected into the furnace at a high speed from the gas medium outlet 33 on the front cap 6, and is fully mixed with the oxygen coal medium, so as to adjust the furnace condition, save coke, and improve the The role of production efficiency. The whole tuyere of the invention has reasonable structure, good cooling effect and powerful air supply function.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. A small combined air outlet cover, characterized in that, the combined air outlet small cover comprises: A central sleeve, one end of the central sleeve is provided with an oxygen-coal medium inlet, and the other end is fixedly sleeved with an inner sleeve, and the central sleeve communicates with the inner cavity of the inner sleeve to form an oxygen-coal medium channel; The first sleeve is sleeved on the outside of the central sleeve, the gap between the first sleeve and the central sleeve forms a cooling water inlet channel, and the first sleeve is close to the oxygen coal There is a water inlet on one side of the medium inlet; The second sleeve is L-shaped, and the second sleeve is partially sleeved on the outside of the first sleeve, and the gap between the second sleeve and the first sleeve forms a gas medium channel. A gas medium inlet is provided on the side of the first casing near the oxygen-coal medium inlet; The third sleeve is sleeved on the outside of the second sleeve, and the gap between the third sleeve and the second sleeve forms a cooling water return channel. There is a water return port on the side of the coal medium inlet; A front cap and a rear cap of an integral structure are fixedly connected to the end of the cooling water inlet channel and the cooling water return channel away from the water inlet and the water return port, and the cooling water inlet channel is connected to the cooling water return channel. The cooling water return channel is connected through the front cap and the rear cap to form a cooling water circulation channel; An oxygen-coal medium outlet connected to the oxygen-coal medium channel is opened on the front cap; and a gas medium outlet connected to the gas medium channel is also opened on the front cap; A flow guide device is provided on the side of the cooling water circulation channel close to the front cap, and the flow guide device includes a plurality of flow guide plates, and the flow guide plates are arranged alternately and at intervals in the cooling water circulation channel On both side walls, one end of each deflector is welded to one side wall of the cooling water circulation channel, and the other end of the deflector has a specified distance from the other side wall of the cooling water circulation channel . 2 . The combined tuyere cover according to claim 1 , wherein the flow guiding device is provided on a side of the cooling water inlet channel close to the front cap. 3 . 3. The combined tuyere cover according to claim 1 or 2, characterized in that the flow guide device is provided on the side of the cooling water return channel close to the front cap. 4 . The combined tuyere cover according to claim 1 , wherein the deflector includes 3 to 6 deflectors. 5. The combined tuyere cover according to claim 1, wherein the deflector is a stainless steel deflector. 6. The small combined tuyere cover according to claim 1, wherein the outlet of the oxygen-coal medium is set at the center of the front cap, and a plurality of circular outlets are opened on the front cap along the circumferential direction. Pore-shaped outlets for the gas medium. 7. The combined tuyere cover according to claim 1, wherein the front cap is formed by extrusion casting of pure copper, and the rear cap is formed by casting of boiler steel. 8. The small combined tuyere sleeve according to claim 1, wherein the central sleeve, the inner sleeve, the first sleeve, the second sleeve and the third sleeve are all stainless steel sleeves.

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