CN213543218U

CN213543218U - Upper layer tuyere copper water jacket for side-blown converter and side-blown converter

Info

Publication number: CN213543218U
Application number: CN202022046343.5U
Authority: CN
Inventors: 彭红发; 郑宇其
Original assignee: Hunan Ruiyi Zihuan Technology Co ltd
Current assignee: Hunan Ruiyi Zihuan Technology Co ltd
Priority date: 2020-04-30
Filing date: 2020-09-17
Publication date: 2021-06-25
Anticipated expiration: 2030-09-17

Abstract

The utility model discloses an upper wind gap copper water jacket and side-blown converter for side-blown converter, the copper water jacket includes two headwall water jackets and two lateral wall water jackets, two headwall water jackets and two lateral wall water jackets enclose to close and form furnace, the lateral wall water jacket is formed by two at least lateral wall water jacket unit concatenations, be equipped with last wind gap and the lower wind gap of arranging along staggering on the lateral wall water jacket direction of height on the inner wall of lateral wall water jacket unit, it all is used for installing the tuyere that sprays compressed air in to furnace with lower wind gap to go up the wind gap, last wind gap and the lower wind gap on the lateral wall water jacket are along the length direction of lateral wall water jacket and interval arrangement in turn. Because the upper air nozzles and the lower air nozzles of the copper water jacket units are staggered and alternately arranged, dust and CO gas escaping and rising from the dead corners of the two adjacent lower air nozzles are intercepted and decomposed again by the air curtain blown out by the upper air nozzles between the upper air nozzles and the lower air nozzles. Thereby eliminating dead corners of the air curtain and greatly improving the capability of decomposing CO and intercepting light dust.

Description

Upper layer tuyere copper water jacket for side-blown converter and side-blown converter

Technical Field

The utility model relates to a pyrometallurgical equipment technical field especially relates to an upper wind gap copper water jacket and side-blown converter for side-blown converter.

Background

As shown in figure 1, an upper layer tuyere copper water jacket of an oxygen-enriched side-blown smelting furnace (hereinafter referred to as a side-blown furnace) is used as a part of a main structure of the side-blown furnace and is mainly formed by enclosing two end wall water jackets 2 and two side wall water jackets 1, and tuyere devices are arranged on the two side wall water jackets 1. The upper layer tuyere has two functions, namely, oxygen is supplied to ensure that CO gas in the furnace is sufficiently decomposed and oxidized in the area so as to be safely discharged. And secondly, at the plane position of the air port in the side-blown furnace, the air nozzle blows out a layer of air curtain, and the reaction during smelting of the side-blown furnace is controlled below the air curtain, so that a large amount of material dust is prevented from entering a post-process along with flue gas, and the dust content in the flue gas is reduced. In the production process, for the first effect of the upper layer tuyere, if CO can not be fully decomposed and oxidized in the area, a post-combustion port must be opened or the difficulty of post-process waste gas treatment is increased. The second function of the upper layer tuyere has very critical function on the stable operation and production optimization of the side blowing furnace, and is particularly important for the normal use and energy efficiency of a post-process waste heat boiler. The dust collection of the flue gas in the production process of the current side blown converter reaches about 15-30% of the amount of the flue gas entering the converter. A large amount of dust enters a dust collecting system along with flue gas, so that the service life of equipment is influenced while the recovery workload is increased, and meanwhile, the furnace returning for recovering a large amount of dust also occupies part of the volume of the furnace body, so that the productivity is influenced. Light dust in the furnace must be intercepted before entering the uptake shaft.

The side-blown converter in the industry at present adopts the structure as shown in fig. 1-3, a tuyere 7 is arranged on each side wall water jacket unit 11 to install a tuyere for blowing compressed air into the converter, and because the tuyere 7 between two adjacent side wall water jacket units 11 has a certain distance, a dead angle or blind area with a large area exists at two sides close to the side air outlet 7 of the converter, a complete air curtain cannot be formed, and therefore, the ideal effect of intercepting dust and CO cannot be achieved. Under the condition of no negative pressure, the effective area of the air curtain can only reach 80 percent of the area in the furnace along with the diffusion of blown air, when the negative pressure is started during work, the effective area of the air curtain is greatly reduced to 50 percent or less, and the actual dust and CO intercepting effect is far from the expected effect.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art's is not enough, provides an eliminate air curtain dead angle, improves the decomposition ability to CO by a wide margin and to the upper wind gap copper water jacket and the side-blown converter that are used for the side-blown converter of the interception of light dust.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides an upper strata wind gap copper water jacket for side blown converter, includes two end wall water jackets and two lateral wall water jackets, and two end wall water jackets and two lateral wall water jackets enclose to close and form furnace, the lateral wall water jacket is formed by two at least lateral wall water jacket units concatenation, be equipped with on the inner wall of lateral wall water jacket unit along the last wind gap and the lower wind gap of stagger arrangement in lateral wall water jacket direction of height, go up the wind gap and all be used for installing the tuyere that sprays compressed air in the furnace down, last wind gap and the lower wind gap on the lateral wall water jacket are along the length direction of lateral wall water jacket and alternate and interval arrangement.

In the production process, air nozzles are arranged on an upper air inlet and a lower air inlet of the side wall water jacket unit, an inlet valve of each air nozzle is always in an open state, compressed air is continuously blown into the furnace, CO gas and light dust generated by smelting rise under the action of negative pressure and reach the lower air inlet, part of dust is intercepted, CO is decomposed, and the other part of dust and CO gas can continue to rise through dead corners or gaps. Because the upper air nozzles and the lower air nozzles of the copper water jacket units are staggered and alternately arranged, dust and CO gas escaping and rising from the dead corners of the two adjacent lower air nozzles are intercepted and decomposed again by the air curtain blown out by the upper air nozzles between the upper air nozzles and the lower air nozzles. Thereby eliminating dead corners of the air curtain and greatly improving the capability of decomposing CO and intercepting light dust.

As a further improvement of the above technical solution:

the distance H between the horizontal plane passing through the geometric center of the upper air inlet and the horizontal plane passing through the geometric center of the lower air inlet is 700-900 mm.

Along with the disturbance of the diffusion and negative pressure action after the air is blown in, the air can form a three-dimensional air curtain layer with the thickness of about one meter at the position, and the three-dimensional air curtain layer can fill the upper section of the whole furnace chamber so as to capture and decompose CO and intercept volatilized light dust as much as possible.

The inner orifice of the upper tuyere is arranged in a downward inclined mode relative to the outer orifice of the upper tuyere, the inner orifice of the lower tuyere is arranged in a downward inclined mode relative to the outer orifice of the lower tuyere, included angles between the central lines of the upper tuyere and the lower tuyere and the horizontal plane are alpha, and the range of alpha is 10-15 degrees.

Therefore, a plurality of strands of compressed air flows which incline downwards are sprayed from all the upper and lower air nozzles of the side wall water jacket to enter the hearth and are lifted and diffused by the flue gas flow escaped from the molten pool under the action of negative pressure to form an air curtain layer which is approximately horizontally arranged.

The air ports generally penetrate through two wall surfaces in the wall thickness direction of the side wall water jacket unit, the inner hole refers to a hole of the corresponding air port located on the inner wall surface of the side wall water jacket, and the outer hole refers to a hole of the corresponding air port located on the outer wall surface of the side wall water jacket. The wall surface of the side wall water jacket facing the inside of the hearth is an inner wall surface, and the wall surface of the side wall water jacket facing away from the inside of the hearth is an outer wall surface.

In order to connect the lower layer tuyere copper water jacket and the furnace top flue, the top of the side wall water jacket is obliquely arranged towards the outside of the hearth relative to the bottom of the side wall water jacket.

The side wall water jacket unit comprises a blocky copper body and a snake-shaped cooling pipe pre-buried in the copper body.

And a groove for hanging slag is arranged on the inner wall of the upper layer tuyere copper water jacket. When the furnace is opened, a layer of slag is attached to the slag hanging groove of the copper water jacket, and the slag layer attached to the slag hanging groove of the copper water jacket is rapidly solidified to form a stable protective layer under the action of cooling circulating water in the copper water jacket.

The copper water jacket is fixed in a connecting frame. The copper water jacket is connected with other parts of the side-blown converter, such as the upper part, the lower part, the left part and the right part, through a connecting frame.

As a general inventive concept, the utility model also provides a side-blown converter, including the furnace shaft, the furnace shaft includes from last three-layer copper water jacket to splicing in proper order down, and the copper water jacket of the superiors is the above-mentioned upper wind gap copper water jacket that is used for the side-blown converter, all install in upper wind gap and the lower wind gap and be used for installing the tuyere that sprays compressed air in to furnace.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses combine prior art to propose innovatively that upper wind gap copper water jacket sets up double-deck wind gap structure, realize changing into the improvement on three-dimensional air curtain layer from individual layer air curtain form, wind gap quantity has increased one time on the basis in the past, has eliminated only one deck wind gap and the air curtain dead angle that exists to increase substantially the interception and the CO of light dust and catch the ability of decomposing. Production practice proves that the utility model discloses an after upper tuyere copper water jacket was applied to the side-blown furnace, CO content dropped to about 2% in the back process flue gas, and light dust recovery volume dropped to about 5% of income stove volume.

Drawings

FIG. 1 is a schematic top view of an upper layer tuyere copper water jacket on a conventional side-blown converter.

Fig. 2 is a front view structural schematic diagram of a conventional upper tuyere copper water jacket unit.

Fig. 3 is a schematic longitudinal sectional view of a conventional upper tuyere copper water jacket unit.

Fig. 4 is a schematic top view of the upper tuyere copper water jacket according to the embodiment of the present invention.

Fig. 5 is a schematic structural view of the upper tuyere copper water jacket unit according to the embodiment of the present invention.

Fig. 6 is a schematic longitudinal sectional structure view of the upper tuyere copper water jacket unit according to the embodiment of the present invention.

FIG. 7 is a schematic structural view of a side-blown converter according to an embodiment of the present invention.

Illustration of the drawings: 1. a sidewall water jacket; 11. a sidewall water jacket unit; 111. a copper body; 112. a serpentine cooling tube; 12. a groove; 2. a headwall water jacket; 3. a hearth; 4. an air inlet; 5. a lower tuyere; 6. the frame is connected.

Detailed Description

The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.

Example (b):

as shown in fig. 7, the oxygen-enriched side-blown converter structure generally comprises a furnace hearth 100, a one-layer copper water jacket 200, a two-layer copper water jacket 300, a three-layer copper water jacket 400, a four-layer molten steel jacket 500 and a rising flue 600 from bottom to top. The upper layer tuyere copper water jacket of the embodiment is applied to a three-layer (i.e. upper layer) copper water jacket 300 of an oxygen-enriched side-blown converter, as shown in fig. 4, the upper layer tuyere copper water jacket of the embodiment comprises two end wall water jackets 2 and two side wall water jackets 1, the two end wall water jackets 2 and the two side wall water jackets 1 enclose to form a hearth 3, and a groove 12 for slag hanging is arranged on the inner wall of the upper layer tuyere copper water jacket. In order to connect the middle layer tuyere copper water jacket and the furnace top flue, the top of the side wall water jacket 1 is obliquely arranged towards the outside of the hearth relative to the bottom of the side wall water jacket 1. The upper layer tuyere copper water jacket is fixed in a connecting frame 6 so as to be fixedly connected with the second layer copper water jacket and the furnace top flue.

The side wall water jacket 1 is formed by splicing at least two side wall water jacket units 11, and each side wall water jacket unit 11 comprises a block-shaped copper body 111 and a serpentine cooling pipe 112 pre-embedded in the copper body 111. As shown in fig. 5 and 6, the side wall water jacket unit 11 is provided with an upper tuyere 4 and a lower tuyere 5 which are arranged in a staggered manner in the height direction of the side wall water jacket 1, and the upper tuyere 4 and the lower tuyere 5 both penetrate through both side wall surfaces in the wall thickness direction of the side wall water jacket unit 11. The upper air inlet 4 and the lower air inlet 5 are both provided with air nozzles for jetting combustion-supporting gas into the hearth 3, and the upper air inlet 4 and the lower air inlet 5 on the side wall water jacket 1 are alternately and alternately arranged at intervals along the length direction of the side wall water jacket 1.

Wherein, the distance H between the horizontal plane passing through the geometric center of the orifice of the upper tuyere 4 and the horizontal plane passing through the geometric center of the orifice of the lower tuyere 5 is 800 mm. Along with the disturbance of the diffusion and negative pressure action after the air is blown in, the air can form a three-dimensional air curtain layer with the thickness of about one meter at the position, and the three-dimensional air curtain layer can fill the upper section of the whole furnace chamber so as to capture and decompose CO and intercept volatilized light dust as much as possible.

In this embodiment, the upper tuyere 4 and the lower tuyere 5 are both arranged obliquely downward, the included angles between the central lines of the upper tuyere 4 and the lower tuyere 5 and the horizontal plane are both α, and α is 12 °.

In the production process, inlet valves of an upper tuyere and a lower tuyere of a copper body are always in an open state, compressed air is continuously blown into the furnace, CO gas and light dust generated by smelting rise under the action of negative pressure and reach the lower tuyere, part of dust is intercepted, CO is decomposed, and the other part of dust and CO gas can continue to rise through dead corners or gaps.

Because the upper air nozzle and the lower air nozzle of the copper water jacket are staggered and alternately arranged, dust and CO gas escaping and rising from the dead angle of the lower air nozzle are intercepted and decomposed again by the air curtain blown out by the upper air nozzle.

The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims

1. The utility model provides an upper strata wind gap copper water jacket for side blown converter, includes two end wall water jackets (2) and two lateral wall water jackets (1), and two end wall water jackets (2) and two lateral wall water jackets (1) enclose to close and form furnace (3), lateral wall water jacket (1) is formed by splicing at least two lateral wall water jacket units (11), its characterized in that, be equipped with on lateral wall water jacket unit (11) along lateral wall water jacket (1) direction of height upper tuyere (4) and lower tuyere (5) of stagger arrangement, upper tuyere (4) and lower tuyere (5) all are used for installing the tuyere that sprays compressed air to furnace (3), upper tuyere (4) and lower tuyere (5) on lateral wall water jacket (1) are along the length direction of lateral wall water jacket (1) and alternate and interval arrangement.

2. The upper tuyere copper water jacket for a side-blown converter as claimed in claim 1, wherein a distance H between a horizontal plane passing through the geometric center of the opening of the upper tuyere (4) and a horizontal plane passing through the geometric center of the opening of the lower tuyere (5) is 700mm to 900 mm.

3. The upper tuyere copper water jacket for a side-blown converter as recited in claim 1, wherein the inner orifice of said upper tuyere (4) is disposed obliquely downward with respect to the outer orifice of the upper tuyere (4), and the inner orifice of said lower tuyere (5) is disposed obliquely downward with respect to the outer orifice of the lower tuyere (5).

4. The upper tuyere copper water jacket for the side-blown converter as recited in claim 3, wherein an angle between the center line of said upper tuyere (4) and said lower tuyere (5) and a horizontal plane is α, and α ranges from 10 ° to 15 °.

5. The upper layer tuyere copper water jacket for the side-blown converter as claimed in claim 1, wherein the top of said side wall water jacket (1) is disposed obliquely to the outside of the furnace chamber with respect to the bottom of the side wall water jacket (1).

6. The upper tuyere copper water jacket for a side-blown converter according to any one of claims 1 to 5, wherein the side wall water jacket unit (11) comprises a block-shaped copper body (111) and serpentine cooling pipes (112) pre-buried in the copper body (111).

7. The upper tuyere copper water jacket for the side-blown converter as claimed in any one of claims 1 to 5, wherein a groove (12) for catching slag is provided on the inner wall of the upper tuyere copper water jacket.

8. The upper tuyere copper water jacket for a side-blown converter according to any one of claims 1 to 5, wherein said copper water jacket is fixed in a connecting frame (6).

9. A side-blown converter, comprising a furnace body, wherein the furnace body comprises three copper water jackets which are sequentially spliced from top to bottom, and the copper water jacket on the uppermost layer is the copper water jacket of the upper layer tuyere for the side-blown converter in any one of claims 1 to 8, and air nozzles (7) for installing compressed air to be injected into a hearth (3) are respectively installed in the upper tuyere (4) and the lower tuyere (5).