CN214830454U - Slag splashing furnace protection for converter steelmaking and converter mouth oxygen lance - Google Patents

Abstract

The utility model discloses a slag splashing furnace protection and a furnace mouth oxygen lance for converter steelmaking, wherein the oxygen lance has the dual functions of slag splashing furnace protection and furnace mouth protection, and the slag splashing furnace protection and the furnace mouth protection are carried out synchronously; the oxygen lance comprises a lance body, wherein a blower component is arranged on the lance body, the blower component comprises a blower, the blower comprises an inner tube body, a middle tube body and an outer tube body which are sequentially arranged from inside to outside, a plurality of blowing tube bodies are arranged on the inner tube body, the middle tube body and the outer tube body, and the plurality of blowing tube bodies are uniformly distributed in a circumferential manner by taking the axis of the inner tube body, the axis of the middle tube body and the axis of the outer tube body as the center; the purging pipe body is obliquely arranged, and purging holes are respectively formed in the purging pipe body; the utility model provides an oxygen rifle, oxygen rifle have splash slag and protect stove and stove mouthful dual function, splash slag and protect the stove and go on in step with the stove mouth, can make the stove mouth bonding thing in time obtain melting, solve the stove mouth effectively and glue the sediment problem, change the stove mouth process and do not hinder the production time to improve the converter operation rate.

Description

Slag splashing furnace protection for converter steelmaking and converter mouth oxygen lance

Technical Field

The utility model relates to an oxygen rifle, specific theory relates to a splash slag protects stove and stove mouth oxygen rifle for converter steelmaking, belongs to metallurgical steelmaking equipment technical field.

Background

The basic principle of slag splashing furnace protection technology is that after the converter taps, the residual end slag component is adjusted, the saturated or supersaturated end slag is obtained by utilizing the MgO content, the high-pressure nitrogen is blown out by the oxygen lance nozzle, and a high-melting-point slag splashing layer which is well sintered and attached to the furnace lining is formed on the surface of the furnace lining through the splashing of the high-pressure nitrogen, so that the slag splashing layer has good corrosion resistance, and the mechanical scouring of the furnace lining in the steelmaking process can be reduced, thereby protecting the furnace lining bricks, slowing down the damage degree of the furnace lining and prolonging the service life of the furnace lining.

During slag splashing furnace protection and smelting, slag adhesion at the furnace mouth is an inevitable problem, and due to the existence of the slag adhesion, the situations that the furnace mouth of the converter is too small and the furnace mouth is too high are often caused, and a series of negative effects are caused. The phenomenon that iron is seriously sprinkled will appear in the process of adding iron in the furnace mouth undersize, cause the loss of steel materials to be extravagant, cause the cold charge such as the great scrap steel of size to add the difficulty simultaneously, prolonged production assistance time, the too high furnace mouth not only influences the judgement to flame in the converting process, because the furnace mouth glues the friction of sediment and water-cooling petticoat pipe and often can cause the leaking of petticoat pipe in the process of rocking the furnace in addition, and then the smooth going on of direct influence production.

The traditional mode of clearing the slag adhered to the converter mouth is mainly three, namely clearing by a furnace dismantling machine, melting the converter mouth by an oxygen lance nozzle and manually burning the converter mouth by oxygen, but in the actual operation process, the three modes have respective disadvantages:

1. the furnace mouth is cleaned by using the furnace detaching machine, the treatment time is long, and under the condition that the slag adhered to the furnace mouth is too thick and firm, the mechanical force of the furnace detaching machine can damage the steel structure of the furnace mouth and the furnace brick at the furnace cap part, so that the converter is damaged to a certain extent, and therefore, the slag adhered to the furnace mouth of the converter cannot be treated completely and effectively by using the method;

2. the method is convenient to operate, but because the included angle of the oxygen lance nozzle is small, if the lance position is improperly controlled in the operation process of the furnace mouth, oxygen jet flow can damage the water-cooling smoke hood and the furnace lining; the furnace mouth adhesive cannot be melted in time, the effect of melting the furnace mouth cannot completely melt the furnace mouth adhesive, and the effect of melting the furnace mouth is influenced; the production time is delayed in the process of the converter mouth, so that the operation rate of the converter is low;

3. the method for burning the converter mouth by using the oxygen manually has the advantages that the converter mouth is required to be leveled by using the oxygen, then the converter mouth is burnt by using the oxygen blowing pipe manually, so that the smoke and dust in the process of burning the converter mouth are large, the environment is influenced, the labor intensity of operators is large, the efficiency is low, the operation rate of the converter is influenced, and the personal safety is also influenced.

The above three methods have disadvantages, and none of them can effectively solve the problem of slag sticking at the converter mouth, so that a new way for quickly and effectively treating the slag sticking at the converter mouth needs to be developed to better solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a slag splashing furnace protection and a mouth oxygen lance for converter steelmaking aiming at the defects in the background technology, the oxygen lance has the dual functions of slag splashing furnace protection and mouth melting, and the slag splashing furnace protection and mouth melting are carried out synchronously; the bonding material at the furnace mouth can be melted in time, the problem of slag bonding at the furnace mouth is effectively solved, the production time is not delayed in the furnace mouth melting process, and the operation rate of the converter is improved.

For solving the technical problem, the utility model discloses a following technical scheme:

a slag splashing furnace protection and a furnace mouth oxygen lance for converter steelmaking are provided, the oxygen lance has the dual functions of slag splashing furnace protection and furnace mouth protection, and the slag splashing furnace protection and the furnace mouth protection are carried out synchronously; the oxygen lance comprises a lance body, wherein a blower component is arranged on the lance body, and the blower component comprises a blower; the blower comprises an inner pipe body, a middle pipe body and an outer pipe body which are sequentially arranged from inside to outside; the inner pipe body, the middle pipe body and the outer pipe body are provided with a plurality of purging pipe bodies, and the purging pipe bodies are uniformly distributed in a circumferential manner by taking the axis of the inner pipe body, the axis of the middle pipe body and the axis of the outer pipe body as the center; the purging pipe body is obliquely arranged, and purging holes are formed in the purging pipe body respectively.

Furthermore, the cross section of the blowing hole is a long hole with two arc-shaped ends, and the included angle between the blowing hole and the vertical direction is 60 degrees; the number of the purging pipe bodies is 8.

Furthermore, a shunt tube body is arranged above the inner end of the purging tube body, and the axis of the shunt tube body is coaxial with the axis of the inner tube body, the middle tube body and the outer tube body.

Furthermore, a shunt cavity is arranged in the shunt tube body, the shunt cavity is communicated with the air inlet end of the purge hole, and the air outlet end of the purge hole is positioned on the outer wall surface of the outer tube body; and the bottom of the diversion cavity is provided with an air guide cone.

Furthermore, a plurality of nitrogen blowing through holes which are uniformly distributed in the circumferential direction are formed between the purging pipe body and the inner pipe body; a plurality of water inlet through holes which are uniformly distributed in the circumferential direction are formed between the sweeping pipe body and the middle pipe body; a plurality of backwater through holes which are circumferentially and uniformly distributed are formed between the purging pipe body and the outer pipe body.

Furthermore, the gun body comprises a nitrogen blowing pipe, a water inlet pipe and a water return pipe, and the nitrogen blowing pipe, the water inlet pipe and the water return pipe are all welded in a segmented mode; the nitrogen blowing pipe comprises an upper section of the nitrogen blowing pipe and a lower section of the nitrogen blowing pipe, the water inlet pipe comprises an upper section of the water inlet pipe and a lower section of the water inlet pipe, and the water return pipe comprises an upper section of the water return pipe and a lower section of the water return pipe.

Furthermore, the blower component is positioned between the upper section of the nitrogen blowing pipe and the lower section of the nitrogen blowing pipe, between the upper section of the water inlet pipe and the lower section of the water inlet pipe and between the upper section of the water return pipe and the lower section of the water return pipe; the blower component is positioned above the lower support, and the lower support is fixedly connected to the outer wall surface of the lower section of the water return pipe.

Furthermore, a coaxially arranged purging connecting pipe, an upper connecting inner pipe, an upper connecting middle pipe and an upper connecting outer pipe are fixedly connected above the purging device from inside to outside in sequence; the lower part of the blower is fixedly connected with a lower connecting inner pipe, a lower connecting middle pipe and a lower connecting outer pipe which are coaxially arranged from inside to outside in sequence.

Furthermore, the upper end of the purging connecting pipe is fixedly connected with the lower end of the purging inlet pipe, and the purging inlet pipe is used for inputting oxygen at the furnace mouth; the upper end of the upper connecting inner pipe is fixedly connected with the lower end of the upper section of the nitrogen blowing pipe, the upper end of the upper connecting middle pipe is fixedly connected with the lower end of the upper section of the water inlet pipe, and the upper end of the upper connecting outer pipe is fixedly connected with the lower end of the upper section of the water return pipe; the lower end of the lower connecting inner pipe is fixedly connected with the upper end of the lower section of the nitrogen blowing pipe, the lower end of the lower connecting middle pipe is fixedly connected with the upper end of the lower section of the water inlet pipe, and the lower end of the lower connecting outer pipe is fixedly connected with the upper end of the lower section of the water return pipe.

Furthermore, the upper end of the inner pipe body is fixedly connected with the lower end of the upper connecting inner pipe, and the lower end of the inner pipe body is fixedly connected with the upper end of the lower connecting inner pipe; the upper end of the middle pipe body is fixedly connected with the lower end of the upper connecting middle pipe, and the lower end of the middle pipe body is fixedly connected with the upper end of the lower connecting middle pipe; the upper end of the outer pipe body is fixedly connected with the lower end of the upper connecting outer pipe, and the lower end of the outer pipe body is fixedly connected with the upper end of the lower connecting outer pipe.

The utility model adopts the above technical scheme after, compare with prior art, have following advantage:

the oxygen lance has double functions of slag splashing and furnace protecting and furnace mouth protecting, and the slag splashing and furnace protecting and the furnace mouth protecting are carried out synchronously; nitrogen is blown out under high pressure through a nozzle, residual end-point slag in the converter is blown and splashed, a slag splashing layer is formed on the surface of a furnace lining, the slag splashing protection function is realized, meanwhile, oxygen is blown to a furnace opening through a blower, sticky slag on the furnace opening is dissolved and thoroughly dissolved in time, and the dissolved sticky slag can automatically fall off or be blown away, so that the furnace opening function is realized; the production time is not delayed in the process of melting the converter mouth, so that the operation rate of the converter is improved;

flat sweeping holes which are uniformly distributed in the circumferential direction are formed in the sweeping device, the sweeping coverage rate in the circumferential direction is increased when gas is swept, the radiation area of oxygen jet flow can be increased, the furnace mouth is fully covered when sweeping, and the effect of melting the furnace mouth is further improved;

the oxygen that utilizes the ware that sweeps to blow off clears up the slag that glues of fire door, need not to empty the furnace body during the scarfing cinder, and to the furnace body not damaged, the fire door after the scarfing cinder is clean smooth, and has simple structure, and the scarfing cinder is efficient, and the scarfing cinder is imitated short grade advantage.

The present invention will be described in detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of the structure at A of the present invention;

FIG. 3 is a schematic structural view of a purge assembly according to the present invention;

FIG. 4 is a schematic structural view of the purging device of the present invention;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 4;

fig. 6 is a view in the direction of C in fig. 5.

In the figure, 1-nitrogen blowing pipe, 101-upper section of nitrogen blowing pipe, 102-lower section of nitrogen blowing pipe; 2-water inlet pipe, 201-upper section of water inlet pipe, 202-lower section of water inlet pipe; 3-a water return pipe, 301-an upper section of the water return pipe and 302-a lower section of the water return pipe; 4-spray head, 5-lower support, 6-nitrogen blowing elbow, 7-water inlet elbow, 8-water return elbow, 9-purging device, 901-inner pipe, 902-middle pipe, 903-outer pipe, 904-purging pipe, 905-nitrogen blowing through hole, 906-water inlet through hole, 907-water return through hole, 908-shunt pipe, 909-shunt cavity, 910-air guide cone and 911-purging hole; 10-upper connecting inner pipe, 11-lower connecting inner pipe, 12-upper connecting middle pipe, 13-lower connecting middle pipe, 14-upper connecting outer pipe, 15-lower connecting outer pipe, 16-purging connecting pipe and 17-purging inlet pipe.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in the figures 1-6 together, the utility model provides a slag splashing furnace protection and mouth oxygen lance for converter steelmaking, the oxygen lance has the dual functions of slag splashing furnace protection and mouth melting, the slag splashing furnace protection and mouth melting are carried out synchronously, the oxygen lance specifically comprises a lance body, and a spray head 4 is installed at the lower end of the lance body.

The rifle body is equipped with inlet tube 2 and wet return 3 including blowing nitrogen pipe 1, the outside of blowing nitrogen pipe 1 overlaps in proper order, blow nitrogen pipe 1, inlet tube 2 and wet return 3 and all adopt the segmentation welding.

The nitrogen blowing pipe 1 comprises an upper section 101 of the nitrogen blowing pipe and a lower section 102 of the nitrogen blowing pipe, the upper section 101 of the nitrogen blowing pipe is connected with the nitrogen blowing elbow 6, and the inner cavity of the nitrogen blowing pipe is communicated; the water inlet pipe 2 comprises an upper section 201 of the water inlet pipe and a lower section 202 of the water inlet pipe, the upper section 201 of the water inlet pipe is connected with the water inlet elbow pipe 7, and the inner cavity of the water inlet pipe is communicated; the water return pipe 3 comprises a water return pipe upper section 301 and a water return pipe lower section 302, the water return pipe upper section 301 is connected with the water return bent pipe 8, and the inner cavity is communicated.

And the lower end parts of the nitrogen blowing pipe 1, the water inlet pipe 2 and the water return pipe 3 are provided with a spray head 4.

The gun body is provided with a blower component which is positioned between the upper section 101 of the nitrogen blowing pipe and the lower section 102 of the nitrogen blowing pipe, between the upper section 201 of the water inlet pipe and the lower section 202 of the water inlet pipe, and between the upper section 301 of the water return pipe and the lower section 302 of the water return pipe.

The blower assembly is positioned above the lower support 5; the lower support 5 is fixedly connected to the outer wall surface of the lower section 302 of the water return pipe.

The purging device assembly comprises a purging device 9, a coaxially arranged purging connecting pipe 16, an upper connecting inner pipe 10, an upper connecting middle pipe 12 and an upper connecting outer pipe 14 are fixedly connected above the purging device 9, and the purging connecting pipe 16, the upper connecting inner pipe 10, the upper connecting middle pipe 12 and the upper connecting outer pipe 14 are sequentially arranged from inside to outside; the lower connecting inner tube 11, the lower connecting middle tube 13 and the lower connecting outer tube 15 which are coaxially arranged are fixedly connected below the blower 9, and the lower connecting inner tube 11, the lower connecting middle tube 13 and the lower connecting outer tube 15 are sequentially arranged from inside to outside.

The upper end of the purging connecting pipe 16 is fixedly connected with the lower end of the purging inlet pipe 17, the gas inlet end at the upper part of the purging inlet pipe 17 is positioned between the nitrogen blowing elbow pipe 6 and the water inlet elbow pipe 7, and the purging inlet pipe 17 is used for inputting oxygen at the furnace mouth.

The upper end of the upper connecting inner pipe 10 is fixedly connected with the lower end of the upper section 101 of the nitrogen blowing pipe, the upper end of the upper connecting middle pipe 12 is fixedly connected with the lower end of the upper section 201 of the water inlet pipe, and the upper end of the upper connecting outer pipe 14 is fixedly connected with the lower end of the upper section 301 of the water return pipe.

The lower end of the lower connecting inner pipe 11 is fixedly connected with the upper end of the lower section 102 of the nitrogen blowing pipe, the lower end of the lower connecting middle pipe 13 is fixedly connected with the upper end of the lower section 202 of the water inlet pipe, and the lower end of the lower connecting outer pipe 15 is fixedly connected with the upper end of the lower section 302 of the water return pipe.

The purger 9 comprises an inner pipe body 901, a middle pipe body 902 and an outer pipe body 903 which are coaxially arranged, wherein the inner pipe body 901, the middle pipe body 902 and the outer pipe body 903 are sequentially arranged from inside to outside.

The upper end of the inner tube 901 is fixedly connected with the lower end of the upper connecting inner tube 10, and the lower end of the inner tube 901 is fixedly connected with the upper end of the lower connecting inner tube 11; the upper end of the middle pipe body 902 is fixedly connected with the lower end of the upper connecting middle pipe 12, and the lower end of the middle pipe body 902 is fixedly connected with the upper end of the lower connecting middle pipe 13; the upper end of the outer pipe 903 is fixedly connected with the lower end of the upper connecting outer pipe 14, and the lower end of the outer pipe 903 is fixedly connected with the upper end of the lower connecting outer pipe 15.

A plurality of purging pipe bodies 904 are arranged on the inner pipe body 901, the middle pipe body 902 and the outer pipe body 903, and the plurality of purging pipe bodies 904 are uniformly distributed in a circumferential manner by taking the axes of the inner pipe body 901, the middle pipe body 902 and the outer pipe body 903 as centers.

The number of the purging pipes 904 is 8; the purging pipe body 904 is arranged obliquely; the inside of the purging pipe body 904 is respectively provided with a purging hole 911, the cross section of the purging hole 911 is a long hole with two arc-shaped ends, and the purging hole 911 is designed in a flat shape to expand a jet flow radiation area; the included angle between the blowing hole 911 and the vertical direction is 60 degrees.

The blowing holes 911 blow oxygen to the furnace mouth to dissolve and thoroughly dissolve the sticky slag on the furnace mouth, and the dissolved sticky slag can automatically fall off or be blown away, so that slag cleaning is realized.

The connection between the purging pipe body 904 and the inner pipe body 901, the connection between the middle pipe body 902 and the outer pipe body 903 adopt smooth transition.

A plurality of circumferentially and uniformly distributed nitrogen blowing through holes 905 are formed between the purging pipe body 904 and the inner pipe body 901, and the nitrogen blowing through holes 905 are used for the penetration of nitrogen gas flow; a plurality of water inlet through holes 906 which are uniformly distributed in the circumferential direction are formed between the sweeping pipe body 904 and the middle pipe body 902, and the water inlet through holes 906 are used for penetrating cooling inlet water; a plurality of backwater through holes 907 which are circumferentially and uniformly distributed are formed between the purging pipe body 904 and the outer pipe body 903, and the backwater through holes 907 are used for penetrating through cooling backwater.

A shunt pipe body 908 is arranged above the inner end of the purging pipe body 904, the axis of the shunt pipe body 908 is coaxial with the axis of the inner pipe body 901, the middle pipe body 902 and the outer pipe body 903, and the junction of the shunt pipe body 908 and the purging pipe body 904 adopts smooth transition.

A branch cavity 909 is arranged inside the branch pipe body 908, the branch cavity 909 is communicated with the air inlet end of the purge hole 911, and the air outlet end of the purge hole 911 is located on the outer wall surface of the outer pipe body 903.

The bottom of the diversion cavity 909 is provided with an air guide cone 910, and the air guide cone 910 is used for decomposing air flow, so that the air flow in the diversion cavity 909 is smoothly guided to the blowing hole 911, and the pressure loss of the air flow is effectively reduced.

The utility model discloses a concrete theory of operation:

nitrogen sequentially passes through the nitrogen-blowing elbow 6, the upper section 101 of the nitrogen-blowing pipe, the upper connecting inner pipe 10, the nitrogen-blowing through hole 905 on the blower 9, the lower connecting inner pipe 11 and the lower section 102 of the nitrogen-blowing pipe, is blown out at high pressure at the position of the spray nozzle 4, and is blown to splash residual end-point slag in the converter, so that a slag splashing layer is formed on the surface of a furnace lining, and the slag splashing furnace protection function is realized;

meanwhile, oxygen is blown to the furnace mouth through the blowing inlet pipe 17, the blowing connecting pipe 16, the diversion cavity 909 in the diversion pipe body 908 and the blowing hole 911 in the blowing pipe body 904 in sequence, sticky slag on the furnace mouth is melted and thoroughly dissolved, and the melted sticky slag can automatically fall off or be blown away, so that the function of the furnace mouth is realized;

the cooling medium enters the cooling channel between the water inlet pipe 2 and the nitrogen blowing pipe 1 through the water inlet elbow 7, enters the spray head 4 through the cooling channel to absorb heat and cool the spray head 4, and the cooling medium after absorbing heat flows to the water return elbow 8 through the water return channel between the water return pipe 3 and the water inlet pipe 2.

The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.

Claims (10)

1. A slag splashing furnace protection and a furnace mouth oxygen lance for converter steelmaking are characterized in that: the oxygen lance has double functions of slag splashing and furnace protecting and furnace opening melting, and the slag splashing and furnace protecting and the furnace opening melting are carried out synchronously; the oxygen lance comprises a lance body, wherein a blower component is arranged on the lance body, and the blower component comprises a blower (9); the blower (9) comprises an inner pipe body (901), a middle pipe body (902) and an outer pipe body (903) which are sequentially arranged from inside to outside; a plurality of purging pipe bodies (904) are arranged on the inner pipe body (901), the middle pipe body (902) and the outer pipe body (903), and the purging pipe bodies (904) are uniformly distributed in a circle by taking the axis where the inner pipe body (901), the middle pipe body (902) and the outer pipe body (903) are located as the center; the purging pipe body (904) is obliquely arranged, and purging holes (911) are respectively formed in the purging pipe body (904).

2. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: the cross section of the purge hole (911) is a long hole with two arc-shaped ends, and the included angle between the purge hole (911) and the vertical direction is 60 degrees; the number of the purging pipe bodies (904) is 8.

3. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: a shunt pipe body (908) is arranged above the inner end of the purging pipe body (904), and the axis of the shunt pipe body (908) is coaxial with the axis of the inner pipe body (901), the middle pipe body (902) and the outer pipe body (903).

4. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 3, wherein: a shunt cavity (909) is arranged in the shunt pipe body (908), the shunt cavity (909) is communicated with the air inlet end of the purge hole (911), and the air outlet end of the purge hole (911) is positioned on the outer wall surface of the outer pipe body (903); the bottom of the diversion cavity (909) is provided with a gas guide cone (910).

5. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: a plurality of nitrogen blowing through holes (905) which are uniformly distributed in the circumferential direction are formed between the sweeping pipe body (904) and the inner pipe body (901); a plurality of water inlet through holes (906) which are uniformly distributed in the circumferential direction are formed between the sweeping pipe body (904) and the middle pipe body (902); a plurality of backwater through holes (907) which are circumferentially and uniformly distributed are arranged between the purging pipe body (904) and the outer pipe body (903).

6. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: the gun body comprises a nitrogen blowing pipe (1), a water inlet pipe (2) and a water return pipe (3), and the nitrogen blowing pipe (1), the water inlet pipe (2) and the water return pipe (3) are all welded in a segmented mode; the nitrogen blowing pipe (1) comprises a nitrogen blowing pipe upper section (101) and a nitrogen blowing pipe lower section (102), the water inlet pipe (2) comprises a water inlet pipe upper section (201) and a water inlet pipe lower section (202), and the water return pipe (3) comprises a water return pipe upper section (301) and a water return pipe lower section (302).

7. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: the blower components are positioned between the upper section (101) of the nitrogen blowing pipe and the lower section (102) of the nitrogen blowing pipe, between the upper section (201) of the water inlet pipe and the lower section (202) of the water inlet pipe, and between the upper section (301) of the water return pipe and the lower section (302) of the water return pipe; the blower component is positioned above the lower support (5), and the lower support (5) is fixedly connected to the outer wall surface of the lower section (302) of the water return pipe.

8. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: a coaxially arranged sweeping connecting pipe (16), an upper connecting inner pipe (10), an upper connecting middle pipe (12) and an upper connecting outer pipe (14) are fixedly connected above the sweeping device (9) from inside to outside in sequence; the lower part of the blower (9) is fixedly connected with a lower connecting inner pipe (11), a lower connecting middle pipe (13) and a lower connecting outer pipe (15) which are coaxially arranged from inside to outside in sequence.

9. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 8, wherein: the upper end of the purging connecting pipe (16) is fixedly connected with the lower end of the purging inlet pipe (17), and the purging inlet pipe (17) is used for inputting oxygen at the furnace mouth; the upper end of the upper connecting inner pipe (10) is fixedly connected with the lower end of the upper section (101) of the nitrogen blowing pipe, the upper end of the upper connecting middle pipe (12) is fixedly connected with the lower end of the upper section (201) of the water inlet pipe, and the upper end of the upper connecting outer pipe (14) is fixedly connected with the lower end of the upper section (301) of the water return pipe; the lower end of the lower connecting inner pipe (11) is fixedly connected with the upper end of the lower section (102) of the nitrogen blowing pipe, the lower end of the lower connecting middle pipe (13) is fixedly connected with the upper end of the lower section (202) of the water inlet pipe, and the lower end of the lower connecting outer pipe (15) is fixedly connected with the upper end of the lower section (302) of the water return pipe.

10. The slag splashing furnace protection and mouth oxygen lance for converter steelmaking as claimed in claim 1, wherein: the upper end of the inner pipe body (901) is fixedly connected with the lower end of the upper connecting inner pipe (10), and the lower end of the inner pipe body (901) is fixedly connected with the upper end of the lower connecting inner pipe (11); the upper end of the middle pipe body (902) is fixedly connected with the lower end of the upper connecting middle pipe (12), and the lower end of the middle pipe body (902) is fixedly connected with the upper end of the lower connecting middle pipe (13); the upper end of the outer pipe body (903) is fixedly connected with the lower end of the upper connecting outer pipe (14), and the lower end of the outer pipe body (903) is fixedly connected with the upper end of the lower connecting outer pipe (15).

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