Blast furnace coal powder spray pipe structure and spray gun
阅读说明:本技术 高炉煤粉喷管结构及喷枪 (Blast furnace coal powder spray pipe structure and spray gun ) 是由 姜本熹 于 2020-07-27 设计创作,主要内容包括:本发明公开一种高炉煤粉喷管结构及喷枪,其中,高炉煤粉喷管结构包括喷粉管,所述喷粉管包括第一出料管,所述第一出料管内形成有导流结构,所述导流结构包括凸设于所述第一出料管内壁面的导流筋条,用以增大自所述第一出料管喷出的煤粉流与空气混合的接触面积,所述导流筋条增大煤粉流外周长来增加煤粉流与空气的接触面积,使得更多的空气与煤粉流接触,燃烧更充分。(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.)
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; alternatively, the first and second electrodes may be,
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.
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; alternatively, the first and second electrodes may be,
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 1.2
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
Flow guiding rib
1a
First connecting pipe
311
Lead-in section
1b
Second connecting pipe
312
2
First discharge pipe
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 outer side wall
1000
Pulverized coal injection gun for blast furnace
3
Flow guiding structure
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
In the technical scheme provided by the invention, the
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
Further, in an embodiment, referring to fig. 4 and 5, the
Furthermore, in an embodiment, the plurality of
The water
In an embodiment, referring to fig. 6 and 7, in a direction toward an outlet of the first discharging
In an embodiment, a plurality of first through
The
In an embodiment, referring to fig. 1 to 2, the
It should be noted that an included angle is formed between the first connection pipe 1a and the
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
The first connecting pipe 1a and the first discharging
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
The blast furnace coal powder
The
In the embodiment that the blast furnace pulverized coal
In the embodiment that the blast furnace coal powder
On one hand, the powder injection sleeve needs to have a longer length to be correspondingly provided with the
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
In one embodiment, the axis of the first discharging
The cross-sectional shape of the
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.
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