CN111705175A - Blast furnace coal powder spray pipe structure and spray gun - Google Patents
Blast furnace coal powder spray pipe structure and spray gun Download PDFInfo
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- CN111705175A CN111705175A CN202010735027.0A CN202010735027A CN111705175A CN 111705175 A CN111705175 A CN 111705175A CN 202010735027 A CN202010735027 A CN 202010735027A CN 111705175 A CN111705175 A CN 111705175A
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- side wall
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- 239000003245 coal Substances 0.000 title claims abstract description 95
- 229940098458 powder spray Drugs 0.000 title claims description 16
- 239000007921 spray Substances 0.000 title abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 80
- 239000007924 injection Substances 0.000 claims abstract description 80
- 239000000843 powder Substances 0.000 claims abstract description 74
- 238000007599 discharging Methods 0.000 claims description 43
- 238000005507 spraying Methods 0.000 claims description 20
- 210000001015 abdomen Anatomy 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002817 coal dust Substances 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010410 dusting Methods 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 description 13
- 239000000243 solution Substances 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a blast furnace pulverized coal injection pipe structure and a spray gun, wherein the blast furnace pulverized coal injection pipe structure comprises a powder injection pipe, the powder injection pipe comprises a first discharge pipe, a flow guide structure is formed in the first discharge pipe, the flow guide structure comprises a flow guide rib protruding on the inner wall surface of the first discharge pipe and used for increasing the contact area of pulverized coal flow sprayed from the first discharge pipe and air mixing, and the flow guide rib increases the outer perimeter of the pulverized coal flow to increase the contact area of the pulverized coal flow and the air, so that more air is in contact with the pulverized coal flow, and the combustion is more sufficient.
Description
Technical Field
The invention relates to the technical field of spray guns for coal powder injection, in particular to a blast furnace coal powder spray pipe structure and a spray gun.
Background
Coal powder injection is one of the most important means for improving smelting strength and reducing production cost in blast furnace production, and generally, the coal powder is injected from an injection gun and then enters a tuyere, and is heated and combusted in a belly pipe and the tuyere through mixing, convection and radiation with high-speed hot air flow.
At present, a straight pipe spray gun with a simple structure is generally used for directly supplying powder fuel into a blast furnace, so that a blast furnace tuyere is easily abraded, and even a blast furnace tuyere burnthrough accident is caused.
Disclosure of Invention
The invention mainly aims to provide a blast furnace coal powder spray pipe structure and a spray gun, aiming at optimizing the structure of the spray gun so as to improve the combustion rate of coal powder.
In order to achieve the above object, the present invention provides a blast furnace coal powder injection pipe structure, which includes a powder injection pipe, the powder injection pipe includes a first discharge pipe, a flow guide structure is formed in the first discharge pipe, and the flow guide structure includes a flow guide rib protruding on an inner wall surface of the first discharge pipe, so as to increase a contact area between a coal powder flow sprayed from the first discharge pipe and air.
Optionally, the flow guide ribs extend linearly along the axial direction of the first discharge pipe; or,
the flow guide ribs extend spirally along the axial direction of the first discharge pipe.
Optionally, one end of the flow guide rib extends to be flush with the outlet end face of the first discharge pipe.
Optionally, towards in the direction of the export of first discharging pipe, the water conservancy diversion rib is including leading-in section, direction section and the derivation section that distributes in proper order, wherein, the water conservancy diversion rib certainly leading-in section to the direction section cross-section increase, and certainly the direction section to the derivation section cross-section reduces.
Optionally, the water conservancy diversion rib sets up a plurality ofly, and follows the circumference interval distribution of first discharging pipe.
Optionally, a plurality of first through holes communicated with the inner cavity of the first discharge pipe are arranged on the first discharge pipe in a penetrating manner.
Optionally, the material of the first discharging pipe is one of ceramic, die steel and high-temperature-resistant alloy.
Optionally, the powder spraying pipe further comprises a first connecting pipe which is communicated with the first discharging pipe and arranged at an included angle, the inner wall surface of the first discharging pipe is provided with a reinforcing area opposite to the pipe opening of the first connecting pipe, and the first discharging pipe is at least arranged in the reinforcing area in a thickening mode.
Optionally, the reinforced region has a center point corresponding to the axis of the first connecting pipe, the outer side of the first tapping pipe has a line passing through the center point, any point on the line is a reinforced point, and the wall thickness of the first tapping pipe decreases from the reinforced point to both sides in the cross section passing through the reinforced point.
Optionally, the first connecting pipe and the first discharging pipe are integrally formed.
Optionally, the inner wall surface of the first tapping pipe has a front inner side wall surface opposite to the pipe orifice of the first connecting pipe and a back inner side wall surface opposite to the front inner side wall surface, the reinforcing region is disposed on the front inner side wall surface, the outer wall surface of the first tapping pipe has a front outer side wall surface and a back outer side wall surface disposed corresponding to the front inner side wall surface and the back inner side wall surface, and a back end surface is formed between the back outer side wall surface and the back inner side wall surface;
the axis corresponding to the first discharge pipe is a first axis, the axis corresponding to the first connecting pipe is a second axis, and an included angle between the first axis and the second axis is alpha;
the included angle between the back end surface and the first axis is beta at the outlet of the first discharge pipe, and the beta is more than or equal to alpha-5 degrees and less than or equal to 90 degrees.
Optionally, α ═ β.
Optionally, the blast furnace pulverized coal injection pipe structure further comprises a powder injection sleeve, and the powder injection sleeve is sleeved outside the first discharge pipe.
Optionally, the first tapping pipe is connected to the powder injection sleeve by means of an insert casting process.
Optionally, a plurality of first through holes communicated with the inner cavity of the first discharge pipe penetrate through the first discharge pipe;
the powder spraying sleeve is provided with a plurality of second through holes corresponding to the first through holes.
Optionally, the powder spraying pipe further comprises a second connecting pipe which is communicated with the powder spraying sleeve and arranged at an included angle, and one section of the second connecting pipe is a projection plane;
the projection outline area of the powder spraying sleeve in the projection plane is S1, the projection outline area of the second connecting pipe in the projection plane is S2, and S1 is not less than S2 and not more than 1.2S 2.
Optionally, S1 ═ S2.
The invention also provides a blast furnace pulverized coal injection gun, which comprises a straight blow pipe and a blast furnace pulverized coal injection pipe structure, wherein a pulverized coal injection end of the blast furnace pulverized coal injection pipe structure extends into the straight blow pipe;
the blast furnace pulverized coal injection pipe structure comprises an injection pipe, the injection pipe comprises a first discharge pipe, a flow guide structure is formed in the first discharge pipe, the flow guide structure comprises flow guide ribs protruding on the inner wall surface of the first discharge pipe and used for increasing the contact area of pulverized coal flow sprayed by the first discharge pipe and air mixing.
Optionally, an axis of the first discharge pipe of the blast furnace coal dust injection pipe structure is parallel to an axis of the belly pipe.
In the technical scheme provided by the invention, the powder spraying pipe comprises a first discharging pipe, a flow guide structure is formed in the first discharging pipe and comprises flow guide ribs which are convexly arranged on the inner wall surface of the first discharging pipe, and the flow guide ribs increase the outer perimeter of the pulverized coal flow to increase the contact area of the pulverized coal flow and air, so that more air is in contact with the pulverized coal flow, and the combustion is more sufficient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a first embodiment of a pulverized coal injection pipe structure of a blast furnace according to the present invention;
FIG. 2 is a schematic sectional view taken along A-A in FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view of a second embodiment of a pulverized coal injection pipe structure of a blast furnace according to the present invention;
FIG. 5 is a schematic cross-sectional view taken along the direction C-C in FIG. 4;
FIG. 6 is a schematic cross-sectional view of a third embodiment of a pulverized coal injection pipe structure of a blast furnace according to the present invention;
FIG. 7 is a schematic cross-sectional view of a fourth embodiment of a pulverized coal injection pipe structure of a blast furnace according to the present invention;
FIG. 8 is a schematic cross-sectional view of a fifth embodiment of a pulverized coal injection pipe structure of a blast furnace according to the present invention;
FIG. 9 is a schematic cross-sectional view taken along line D-D of FIG. 8;
FIG. 10 is an enlarged schematic view of detail E of FIG. 8;
fig. 11 is a schematic cross-sectional view of an embodiment of a pulverized coal injection lance for a blast furnace according to the present invention (including the structure of the pulverized coal injection lance for a blast furnace shown in fig. 1, 4, 7, and 8).
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
31 | |
| 1a | First connecting |
311 | Lead-in section |
| 1b | Second connecting |
312 | |
| 2 | |
313 | Lead-out |
| 21 | First through |
4 | |
| 22 | Front inner |
100 | Blast furnace coal powder |
| 23 | Back inner |
20 | |
| 24 | Just outside |
201 | Second through |
| 25 | Back |
1000 | Pulverized coal injection gun for blast furnace |
| 3 | |
200 | Belly pipe |
The object of the present invention, its functional characteristics and advantageous effects will be further described with reference to the following embodiments and drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Coal powder injection is one of the most important means for improving smelting strength and reducing production cost in blast furnace production, and generally, the coal powder is injected from an injection gun and then enters a tuyere, and is mixed, convected and radiated with high-speed hot air flow to be heated, gasified and combusted in a belly pipe and the tuyere.
At present, a straight pipe spray gun with a simple structure is generally used for directly supplying powder fuel into a blast furnace, so that a blast furnace tuyere is easily abraded, and even a blast furnace tuyere burnthrough accident is caused.
In view of the above, the present invention provides a pulverized coal injection pipe structure of a blast furnace, wherein fig. 1 to 10 are schematic views of embodiments of the pulverized coal injection pipe structure of the blast furnace provided by the present invention.
Referring to fig. 3 to 7, the blast furnace pulverized coal injection pipe structure 100 includes a powder injection pipe 10, the powder injection pipe 10 includes a first discharge pipe 2, a flow guide structure 3 is formed in the first discharge pipe 2, and the flow guide structure 3 includes flow guide ribs 31 protruding on an inner wall surface of the first discharge pipe 2 to increase a contact area of the pulverized coal flow injected from the first discharge pipe 2 and air.
In the technical scheme provided by the invention, the powder spraying pipe 10 comprises a first discharging pipe 2, a flow guide structure 3 is formed in the first discharging pipe 2, the flow guide structure 3 comprises flow guide ribs 31 which are convexly arranged on the inner wall surface of the first discharging pipe 2, and the flow guide ribs 31 increase the outer perimeter of the pulverized coal flow to increase the contact area of the pulverized coal flow and air, so that more air is in contact with the pulverized coal flow, and the combustion is more sufficient.
It should be noted that the flow guide structure 3 increases the contact area between the pulverized coal flow and the air by increasing the outer perimeter of the pulverized coal flow, and may also be implemented by providing a groove, and in addition, by providing the flow guide rib 31, may also increase the wear resistance of the first discharge pipe 2.
Further, in an embodiment, referring to fig. 4 and 5, the flow guide ribs 31 extend linearly along the axial direction of the first discharging pipe 2, so that the structure is easy to form, and in another embodiment, referring to fig. 1 and 3, the flow guide ribs 31 extend spirally along the axial direction of the first discharging pipe 2, so that the pulverized coal flow and air are wrapped in each other in a winding manner during the combustion process of the pulverized coal flow, and the combustion effect is better.
Furthermore, in an embodiment, the plurality of flow guiding ribs 31 are arranged and distributed at intervals along the circumferential direction of the first discharging pipe 2, so that the contact area between air and pulverized coal flow is further increased, and the combustion effect is better.
The water conservancy diversion rib 31 can be arranged at any position in the first discharging pipe 2, in order to keep the shape of the water conservancy diversion structure 3 after the pulverized coal flows, so that the pulverized coal can be quickly mixed with air, in one embodiment, one end of the water conservancy diversion rib 31 extends to be flush with the outlet end face of the first discharging pipe 2, and through the arrangement, the pulverized coal after the water conservancy diversion of the water conservancy diversion rib 31 is finished can be quickly mixed with air, and the combustion effect is better.
In an embodiment, referring to fig. 6 and 7, in a direction toward an outlet of the first discharging pipe 2, the flow guiding rib 31 includes an introducing section 311, a guiding section 312, and a leading-out section 313, which are sequentially distributed, wherein a cross section of the flow guiding rib 31 increases from the introducing section 311 to the guiding section 312, and decreases from the guiding section 312 to the leading-out section 313, when the pulverized coal flow just contacts with the flow guiding rib 31, a large flow resistance is generated, at this time, a cross section of the flow guiding rib 31 increases from the introducing section 311 to the guiding section 312 to reduce the flow resistance, after the pulverized coal flow is guided and molded by the guiding section 312, the flow guiding rib needs to diffuse outward, at this time, a cross section decreases from the guiding section 312 to the leading-out section 313 to increase a diffusion angle of the pulverized coal flow, a combustion effect is better, it is noted that a cross section of the flow guiding rib 31 in an axial direction of the first discharging pipe 2 is changed, the width and the height can be changed, and the change is not limited herein.
In an embodiment, a plurality of first through holes 21 communicating with an inner cavity of the first discharging pipe 2 are formed through one end of the first discharging pipe 2, which is far away from the first connecting pipe 1a, and the pulverized coal flow can be laterally mixed with air in the lance belly pipe 200 through the first through holes 21, so that a plurality of outlets are mixed with the air, the pulverized coal flow is fully mixed with the air, and the combustion effect is better.
The powder spraying pipe 10 may be a single pipe, and in an embodiment, the material of the first discharging pipe 2 is one of ceramic, die steel and high temperature resistant alloy, and by using the above material, the first discharging pipe 2 can obtain better wear resistance and has better effect.
In an embodiment, referring to fig. 1 to 2, the powder injection pipe 10 further includes a first connection pipe 1a communicated with the first discharge pipe 2 and arranged at an included angle, an inner wall surface of the first discharge pipe 2 has a reinforced area opposite to a pipe orifice of the first connection pipe 1a, the first discharge pipe 2 is at least arranged in the reinforced area in a thickened manner, when coal powder flows from the first connection pipe 1a into the first discharge pipe 2, an impact on the reinforced area is relatively large, and a wall thickness of the reinforced area is thickened, so that the wear resistance of the whole powder injection pipe 10 is relatively good, and the service life of the spray gun is prolonged.
It should be noted that an included angle is formed between the first connection pipe 1a and the first discharge pipe 2, which mainly adapts to the fact that the discharge direction of the first discharge pipe 2 is parallel to the belly pipe 200 of the spray gun, and the included angle between the first discharge pipe 2 and the first connection pipe 1a can be set to be an obtuse angle.
The reinforced area is most impacted by the material, only the whole area of the reinforced area may be provided with a thicker wall, or the whole side wall surface facing the opening of the first connecting pipe 1a is provided with a thicker wall, in an embodiment, referring to fig. 2, the reinforced area has a central point corresponding to the axis of the first connecting pipe 1a, the outer side surface of the first discharging pipe 2 has a plain line passing through the central point, any point on the plain line is a reinforced point, and on the cross section passing through the reinforced point, the wall thickness of the first discharging pipe 2 decreases from the reinforced point to two sides, so that the inner wall surface of the first discharging pipe 2 is a smooth curved surface, the wear resistance is enhanced, the resistance in the coal dust flow flowing process is reduced, and a better effect is achieved.
The first connecting pipe 1a and the first discharging pipe 2 may be formed by welding or cast integrally, and in an embodiment, the first connecting pipe 1a and the first discharging pipe 2 are integrally formed, so that pipe sections with different wall thicknesses can be obtained conveniently.
In view of the fact that the powder injection pipe 10 is installed in the blowpipe 200 of the spray gun, in order to reduce the radial profile of the powder injection pipe 10 as much as possible, in an embodiment, referring to fig. 8 to 10, the inner wall surface of the first discharging pipe 2 has a front inner side wall surface 22 opposite to the pipe opening of the first connecting pipe 1a and a back inner side wall surface 23 opposite to the front inner side wall surface 22, the reinforcing region is provided on the front inner side wall surface 22, the outer wall surface of the first discharging pipe 2 has a front outer side wall surface 24 and a back outer side wall surface 25 which are provided corresponding to the front inner side wall surface 22 and the back inner side wall surface 23, a back end surface 4 is formed between the back outer side wall surface 25 and the back inner side wall surface 23, the axis corresponding to the first discharging pipe 2 is a first axis, the axis corresponding to the first connecting pipe 1a is a second axis, and the included angle between the first axis and the second axis is α, the included angle between the back end face 4 and the first axis is beta, and alpha-5 degrees is larger than or equal to beta and smaller than or equal to 90 degrees at the pipe orifice of the first discharge pipe 2, so that the size of the powder spraying pipe 10 in the radial direction is reduced, the volume occupied by the lance belly pipe 200 is reduced, and the air in the belly pipe 200 can conveniently pass through, so that the air and the pulverized coal flow are fully mixed.
On one hand, the first discharging pipe 2 needs a longer length to guide the pulverized coal flow and increase the contact area with the air, and on the other hand, the size of the powder spraying pipe 10 along the radial profile is reduced to reduce the volume occupied by the lance belly pipe 200, and the length of the first discharging pipe 2 needs to be shortened.
The blast furnace coal powder injection pipe structure 100 may be a single pipe or a composite pipe, in an embodiment, the blast furnace coal powder injection pipe structure 100 further includes a powder injection sleeve 20, the powder injection sleeve 20 is sleeved outside the first discharge pipe 2, and the powder injection sleeve 20 is arranged to further protect the first discharge pipe 2, of course, in an embodiment, the powder injection sleeve 20 may be an integral pipeline with the first connection pipe 1a, and the first discharge pipe 2 serves as an inner lining pipe.
The first discharge pipe 2 can be fixedly connected with the powder spraying sleeve 20 in a welding or riveting manner, in an embodiment, the first discharge pipe 2 is connected with the powder spraying sleeve 20 through an insert casting process, and the forming quality is high through the insert casting process.
In the embodiment that the blast furnace pulverized coal injection pipe structure 100 is a composite pipe, the powder injection sleeve 20 is provided with a plurality of second through holes 201 corresponding to the first through holes 21, and pulverized coal flow can be laterally mixed with air in the injection gun belly pipe 200 through the first through holes 21 and the second through holes 201, so that multi-outlet mixing with air is realized, the pulverized coal flow and the air are fully mixed, and the combustion effect is better.
In the embodiment that the blast furnace coal powder injection pipe structure 100 is a composite pipe, in view of mounting the blast furnace coal powder injection pipe structure 100 in the belly pipe 200 of the lance, in order to reduce the radial profile of the blast furnace coal powder injection pipe structure 100 as much as possible, in an embodiment, the powder injection pipe 10 further includes a second connection pipe 1b which is communicated with the powder injection sleeve 20 and is arranged at an included angle, a cross section of the second connection pipe 1b is a projection plane, the projection profile area of the powder injection sleeve 20 in the projection plane is S1, the projection profile area of the second connection pipe 1b in the projection plane is S2, and S2 is not less than S1 is not less than 1.2S 2, so that the radial profile of the blast furnace coal powder injection pipe structure 100 is reduced, the volume occupied by the belly pipe 200 is reduced, and the air of the belly pipe 200 is facilitated to pass through, so that the air is thoroughly mixed with the pulverized coal stream.
On one hand, the powder injection sleeve needs to have a longer length to be correspondingly provided with the first discharge pipe 2 with a longer length to guide the pulverized coal flow, so that the contact area with the air is increased, on the other hand, the radial outline size of the blast furnace pulverized coal injection pipe structure 100 is reduced, so that the volume occupied by the lance belly pipe 200 is reduced, the length of the powder injection sleeve needs to be shortened, the two factors are considered comprehensively, in one embodiment, S1 is S2, a more balanced effect can be obtained, the radial outline size of the powder injection pipe 10 is reduced, and meanwhile, the contact area between the pulverized coal flow and the air is enlarged, so that the powder injection sleeve has a better effect.
Referring to fig. 11, the present invention further provides a blast furnace coal powder spray gun 1000, where the blast furnace coal powder spray gun 1000 includes a belly pipe 200 and a blast furnace coal powder spray pipe structure 100, a coal powder spray end of the blast furnace coal powder spray pipe structure 100 extends into the belly pipe 200, and the blast furnace coal powder spray gun 1000 adopts all technical solutions of the embodiments of the blast furnace coal powder spray pipe structure 100, so that the blast furnace coal powder spray gun 1000 also has all technical effects brought by the technical solutions of the embodiments, and details are not repeated here.
In one embodiment, the axis of the first discharging pipe 2 of the blast furnace coal powder injection pipe structure 100 is parallel to the axis of the belly pipe 200, and the arrangement is such that the air flow in the belly pipe 200 is more fully mixed with the coal powder flow in the blast furnace coal powder injection pipe structure 100, thereby having better effect.
The cross-sectional shape of the powder injection pipe 10 according to the present invention is not limited to a regular circle or ellipse, the connection between the first discharge pipe 2 and the first connection pipe 1a or the second connection pipe 1b is not limited to a direct connection of a bevel, and may be a transitional connection of an arc or a curve, and the axis of the powder injection pipe 10 is not limited to a straight line but may be a curve.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a blast furnace coal powder spray pipe structure for blast furnace coal powder spray gun, its characterized in that, blast furnace coal powder spray pipe structure is including the pipe of dusting, the pipe of dusting is including first discharging pipe, be formed with the water conservancy diversion structure in the first discharging pipe, the water conservancy diversion structure is including protruding locating the water conservancy diversion rib of first discharging pipe internal face for the increase from the area of contact of first discharging pipe spun coal powder stream and air mixing.
2. The blast furnace coal dust injection pipe structure according to claim 1, wherein the flow guide ribs extend linearly in the axial direction of the first discharge pipe; or,
the flow guide ribs extend spirally along the axial direction of the first discharge pipe.
3. The blast furnace coal dust injection pipe structure according to claim 1, wherein one end of the flow guide rib extends to be flush with an outlet end face of the first discharge pipe; and/or the presence of a gas in the gas,
the plurality of flow guide ribs are arranged and distributed at intervals along the circumferential direction of the first discharge pipe; and/or the presence of a gas in the gas,
a plurality of first through holes communicated with the inner cavity of the first discharge pipe penetrate through the first discharge pipe; and/or the presence of a gas in the gas,
the first discharging pipe is made of one of ceramic, die steel and high-temperature-resistant alloy.
4. The blast furnace coal dust injection pipe structure according to claim 3, wherein the flow guide rib comprises an inlet section, a guide section and an outlet section which are sequentially distributed in a direction toward the outlet of the first discharge pipe, wherein the flow guide rib has a cross section that increases from the inlet section toward the guide section and decreases from the guide section toward the outlet section.
5. The blast furnace coal powder injection pipe structure according to claim 1, wherein the powder injection pipe further comprises a first connection pipe communicated with and arranged at an included angle with the first discharge pipe, an inner wall surface of the first discharge pipe is provided with a reinforced area opposite to a pipe opening of the first connection pipe, and the first discharge pipe is thickened at least in the reinforced area.
6. The blast furnace coal dust injection pipe structure according to claim 5, wherein the reinforced region has a center point corresponding to an axis of the first connection pipe, an outer side surface of the first discharge pipe has a plain line passing through the center point, any point on the plain line is a reinforced point, and a wall thickness of the first discharge pipe decreases from the reinforced point to both sides in a cross section passing through the reinforced point; and/or the presence of a gas in the gas,
the first connecting pipe and the first discharging pipe are integrally formed.
7. The blast furnace coal dust injection pipe structure according to claim 5, wherein the inner wall surface of the first discharging pipe has a front inner side wall surface opposed to the pipe opening of the first connecting pipe and a back inner side wall surface opposed to the front inner side wall surface, the reinforcing region is provided on the front inner side wall surface, the outer wall surface of the first discharging pipe has a front outer side wall surface and a back outer side wall surface provided corresponding to the front inner side wall surface and the back inner side wall surface, and a back end surface is formed between the back outer side wall surface and the back inner side wall surface;
the axis corresponding to the first discharge pipe is a first axis, the axis corresponding to the first connecting pipe is a second axis, and an included angle between the first axis and the second axis is alpha;
the included angle between the back end surface and the first axis is beta at the outlet of the first discharge pipe, and the beta is more than or equal to alpha-5 degrees and less than or equal to 90 degrees.
8. The blast furnace coal powder injection pipe structure according to claim 1, further comprising a powder injection sleeve, wherein the powder injection sleeve is sleeved outside the first discharge pipe.
9. The blast furnace coal powder injection pipe structure according to claim 8, wherein the first discharge pipe is connected to the powder injection sleeve by an insert casting process; and/or the presence of a gas in the gas,
a plurality of first through holes communicated with the inner cavity of the first discharge pipe penetrate through the first discharge pipe, and a plurality of second through holes are formed in the powder spraying sleeve corresponding to the first through holes; and/or the presence of a gas in the gas,
the powder spraying pipe further comprises a second connecting pipe which is communicated with the powder spraying sleeve and arranged at an included angle, one section of the second connecting pipe is a projection plane, the projected outline area of the powder spraying sleeve in the projection plane is S1, the projected outline area of the second connecting pipe in the projection plane is S2, and S1 is not less than S2 and not more than S1 and not more than 1.2S 2.
10. A blast furnace pulverized coal injection lance, comprising:
a belly pipe; and the number of the first and second groups,
the blast furnace coal powder injection pipe structure is as claimed in any one of claims 1 to 9;
and the pulverized coal spraying end of the blast furnace pulverized coal spraying pipe structure extends into the vertical blowing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735027.0A CN111705175A (en) | 2020-07-27 | 2020-07-27 | Blast furnace coal powder spray pipe structure and spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010735027.0A CN111705175A (en) | 2020-07-27 | 2020-07-27 | Blast furnace coal powder spray pipe structure and spray gun |
Publications (1)
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| JPH08104909A (en) * | 1994-10-04 | 1996-04-23 | Kawasaki Steel Corp | Device for blowing pulverized coal for blast furnace and operation for blowing pulverized coal in blast furnace |
| CN101319787A (en) * | 2008-06-20 | 2008-12-10 | 武汉钢铁(集团)公司 | Coal powder lance for blast furnace |
| CN201296760Y (en) * | 2008-12-01 | 2009-08-26 | 攀枝花新钢钒股份有限公司 | Pulverized coal spray gun |
| CN103255253A (en) * | 2012-02-17 | 2013-08-21 | 张昭贵 | Side spraying type coal powder spraying gun |
| CN204198760U (en) * | 2014-09-26 | 2015-03-11 | 鞍钢股份有限公司 | Coal injection gun for blast furnace |
| CN205205159U (en) * | 2015-11-17 | 2016-05-04 | 鞍钢股份有限公司 | Composite coal injection gun |
| CN207687545U (en) * | 2018-01-03 | 2018-08-03 | 河北能和电力工程有限公司 | A kind of coal dust conveying bend |
| CN210034732U (en) * | 2019-04-28 | 2020-02-07 | 中国电建集团山东电力建设有限公司 | Generating set pulverized coal system |
| CN212404134U (en) * | 2020-07-27 | 2021-01-26 | 武汉摩林翰机电设备有限公司 | Blast furnace coal powder spray pipe structure and spray gun |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08104909A (en) * | 1994-10-04 | 1996-04-23 | Kawasaki Steel Corp | Device for blowing pulverized coal for blast furnace and operation for blowing pulverized coal in blast furnace |
| CN101319787A (en) * | 2008-06-20 | 2008-12-10 | 武汉钢铁(集团)公司 | Coal powder lance for blast furnace |
| CN201296760Y (en) * | 2008-12-01 | 2009-08-26 | 攀枝花新钢钒股份有限公司 | Pulverized coal spray gun |
| CN103255253A (en) * | 2012-02-17 | 2013-08-21 | 张昭贵 | Side spraying type coal powder spraying gun |
| CN204198760U (en) * | 2014-09-26 | 2015-03-11 | 鞍钢股份有限公司 | Coal injection gun for blast furnace |
| CN205205159U (en) * | 2015-11-17 | 2016-05-04 | 鞍钢股份有限公司 | Composite coal injection gun |
| CN207687545U (en) * | 2018-01-03 | 2018-08-03 | 河北能和电力工程有限公司 | A kind of coal dust conveying bend |
| CN210034732U (en) * | 2019-04-28 | 2020-02-07 | 中国电建集团山东电力建设有限公司 | Generating set pulverized coal system |
| CN212404134U (en) * | 2020-07-27 | 2021-01-26 | 武汉摩林翰机电设备有限公司 | Blast furnace coal powder spray pipe structure and spray gun |
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