CN115786606A - Blast furnace shaft blowing method - Google Patents
Blast furnace shaft blowing method Download PDFInfo
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- CN115786606A CN115786606A CN202211372633.6A CN202211372633A CN115786606A CN 115786606 A CN115786606 A CN 115786606A CN 202211372633 A CN202211372633 A CN 202211372633A CN 115786606 A CN115786606 A CN 115786606A
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- 238000007664 blowing Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 92
- 239000007924 injection Substances 0.000 claims description 92
- 239000002826 coolant Substances 0.000 claims description 36
- 238000009434 installation Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 15
- 230000002349 favourable effect Effects 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 241001062472 Stokellia anisodon Species 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
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- 239000002994 raw material Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Furnace Charging Or Discharging (AREA)
Abstract
The invention relates to the technical field of low-carbon smelting of blast furnaces, in particular to a blast furnace shaft blowing method. The method comprises the following steps: at least one set of furnace body blowing device which penetrates through the furnace wall of the furnace body and extends into the blast furnace is arranged at the furnace body part of the blast furnace, and the furnace body blowing device is used for blowing reducing media into the blast furnace; when the number of the furnace body blowing devices is multiple, the multiple sets of the furnace body blowing devices are uniformly arranged along the circumferential direction of the furnace body; and installing a valve on the furnace body blowing device, and controlling the valve to adjust the flow and the flow velocity of the reducing medium sprayed into the blast furnace. The beneficial effects are that: spraying a reducing medium into the blast furnace through a furnace body spraying device, so that the sprayed reducing medium can directly reach the interior of a material layer in the furnace, and the reasonable distribution of the reducing medium in the furnace is facilitated; based on this, through the flow and the velocity of flow of valve control reducing medium, be favorable to adapting to blast furnace low carbon and smelt various operating modes, be favorable to reducing medium and the abundant contact reaction of in-furnace material, raise the efficiency, reduce carbon and discharge.
Description
Technical Field
The invention relates to the technical field of low-carbon smelting of blast furnaces, in particular to a blast furnace shaft blowing method.
Background
The global crude steel yield is about 18.78 hundred million tons in 2020, the Chinese yield accounts for about 56.7 percent of the global proportion, and more than 60 percent of steel is produced by long process of blast furnaces and converters in the global range every year. The blast furnace iron-making process depends on coke and coal to provide heat and a reducing agent, the carbon emission in steel production accounts for about 7-8% of the global carbon emission, and the carbon emission in steel production in China is only inferior to the electric power industry and accounts for about 18% of the total emission in China. In the global carbon neutralization development background, the carbon reduction development of the steel industry is far from the priority.
One of the main technical routes for reducing carbon in blast furnace iron making is top gas circulation, i.e. unused CO in blast furnace gas is heated and then sprayed back into the blast furnace, and especially when hot CO is sprayed into the shaft part of the blast furnace, the concentration of CO in the furnace can be obviously improved, and the indirect reduction potential can be improved. The bulk density of the materials at the shaft part of the blast furnace is large, the porosity of the material column is low, and high-temperature CO gas needs to be fed into the furnace with certain blowing kinetic energy, so that the high-temperature CO gas is conveniently and fully combined with the materials in the furnace.
The existing blast furnace injection method is to send high-temperature and high-pressure oxygen-enriched air into the furnace through a tuyere arranged at a hearth part, and the market lacks a technology for conveying and injecting high-temperature, high-pressure and reducing gas into a blast furnace body. The conveying and blowing of the reducing gas from the furnace body to the blast furnace is more beneficial to the reasonable distribution of the reducing gas in the furnace, so that a blast furnace body blowing method is needed to be developed, which is used for feeding high-temperature, high-pressure and reducing gas media to the blast furnace body, helping the reducing gas to enter the furnace to be reasonably distributed, fully contacting with the iron-containing raw material, and achieving the purposes of improving the efficiency and reducing the carbon emission.
Disclosure of Invention
In order to achieve the purpose and other related purposes, the invention discloses a blast furnace shaft injection method, which is used for injecting a reducing medium into a blast furnace from a shaft part of the blast furnace, so that the reducing medium can be reasonably distributed in the blast furnace and fully contacted with iron-containing raw materials, and the purpose of reducing the iron-making carbon emission of the blast furnace is achieved.
In order to achieve the above objects and other related objects, the present invention provides a blast furnace shaft injection method, comprising the steps of:
installing at least one set of furnace body blowing device which penetrates through a furnace wall of the furnace body and extends into the blast furnace at the furnace body part of the blast furnace, wherein the furnace body blowing device is used for blowing reducing media into the blast furnace; when the number of the furnace body blowing devices is multiple, the multiple sets of the furnace body blowing devices are uniformly arranged along the circumferential direction of the furnace body;
and installing a valve on the furnace body blowing device, and controlling the valve to adjust the flow and the flow velocity of the reducing medium sprayed into the blast furnace.
Optionally, the furnace body blowing device comprises a furnace body blowing piece, the furnace body blowing piece comprises a blowing piece main body, an airflow channel which penetrates through the blowing piece main body along the axial direction of the blowing piece main body is arranged in the blowing piece main body, the front end of the blowing piece main body extends into the blast furnace, and the valve is installed at the rear end of the blowing piece main body;
and enabling the reducing medium to flow through a valve and then enter the rear end of the airflow channel, spraying the reducing medium from the front end of the airflow channel and entering the blast furnace, and controlling the valve to adjust the flow and the flow rate of the reducing medium entering the airflow channel.
Optionally, a cooling channel distributed outside the airflow channel is arranged in the injection piece main body, the cooling channel includes a first channel section, a second channel section distributed on the side wall of the front end of the injection piece main body, and a third channel section distributed on the side wall of the rear end of the injection piece main body, the rear end of the first channel section is connected with a cooling medium inlet, and the rear end of the third channel section is connected with a cooling medium outlet;
the method comprises the steps that a cooling medium is input into a first channel section from a cooling medium inlet, the cooling medium is conveyed to the front end of a blowing piece main body along the axial direction of the blowing piece main body through the first channel section and enters a second channel section, the cooling medium flows to the rear end of the second channel section in a curve mode and enters a third channel section, and the cooling medium flows in a reciprocating mode along the axial direction of the blowing piece main body in the third channel section and is discharged along a cooling medium outlet.
Optionally, the first channel section is formed by extending the rear end of the injection piece body to the front end of the injection piece body along the axial direction of the injection piece body, the second channel section is a wave-shaped structure extending along the axial direction of the injection piece body, the front end of the second channel section is communicated with the front end of the first channel section, the third channel section is a reciprocating channel section arranged in parallel along the axial direction of the injection piece body, and the front end of the third channel section is communicated with the rear end of the second channel section.
Optionally, the furnace body jetting piece further comprises a sheath, the sheath is arranged on the outer side wall of the rear end of the jetting piece body, and the inner side wall of the sheath is tightly attached to the outer side wall of the rear end of the jetting piece body.
Optionally, the furnace body blowing device further comprises an installation sleeve, the installation sleeve is sleeved on the furnace body blowing piece, and the furnace body blowing piece is installed on the furnace body of the blast furnace through the installation sleeve;
during installation, a first round hole is formed in a furnace shell of the blast furnace, a second round hole corresponding to the first round hole is reserved in a furnace wall cooling wall of the blast furnace, the installation sleeve penetrates through the first round hole and extends into the second round hole and is fixed with the furnace shell in a welding mode, and the front end of a furnace body injection piece penetrates through the installation sleeve and extends into the blast furnace and is connected with the installation sleeve.
Optionally, the furnace body blowing device further includes an adjusting sleeve, a first connecting portion is disposed on the furnace body blowing member, a second connecting portion is disposed on the mounting sleeve, and the adjusting sleeve is sleeved on a portion of the furnace body blowing member between the first connecting portion and the second connecting portion;
during installation, the adjusting sleeve is sleeved on the furnace body injection piece, two ends of the adjusting sleeve are respectively detachably connected with the first connecting portion and the second connecting portion, and the length of the adjusting sleeve is adjusted to adjust the length of the furnace body injection piece extending into the blast furnace, so that the injection position of the furnace body injection piece reaches a designated position.
And gap areas are reserved between the adjusting sleeve and the furnace body blowing piece and between the mounting sleeve and the furnace body blowing piece, filling holes communicated with the gap areas are formed in the mounting sleeve, and the flowing refractory material is conveyed into the gap areas from the filling holes to be solidified and filled in the gap areas.
Optionally, the blowing element body is made of copper or aluminum and the sheath is made of steel; and a hard alloy layer is arranged on the outer wall of the front end of the blowing piece main body, and the outer wall of the furnace body blowing piece is covered by the sheath and the hard alloy layer in a matched mode.
Optionally, a medium mixing interface communicated with the airflow channel is obliquely arranged on the side wall of the rear end of the furnace body blowing piece; when the valve is opened, other media are introduced into the airflow channel along the media mixing interface to be mixed with the reducing media to obtain mixed media, and the mixed media are sprayed into the blast furnace along the airflow channel; when the valve is closed, inert gas is continuously introduced into the gas flow channel along the medium mixing interface to prevent the furnace material from blocking the tuyere.
According to the blast furnace shaft injection method, the shaft injection device is arranged at the shaft part to inject the reducing medium into the blast furnace from the shaft part, so that the injected reducing medium can directly reach the interior of a material layer in the furnace, and the reasonable distribution of the reducing medium in the furnace is facilitated; based on this, through the flow and the velocity of flow of valve control reducing medium, be favorable to adapting to blast furnace low carbon and smelt various operating modes, be favorable to reducing medium and the abundant contact reaction of in-furnace material, raise the efficiency, reduce carbon and discharge.
Drawings
FIG. 1 is a schematic structural view of a shaft injection device in a first embodiment of a blast furnace shaft injection method according to the present invention;
FIG. 2 is a schematic view of the operation of the shaft blowing apparatus of FIG. 1;
FIG. 3 is a schematic structural view of a shaft injection device in a second embodiment of the blast furnace shaft injection method of the present invention;
FIG. 4 is a schematic view of the operation of the shaft blowing apparatus of FIG. 3;
FIG. 5 is a schematic structural view of a shaft injection device in a third embodiment of a blast furnace shaft injection method of the present invention;
FIG. 6 isbase:Sub>A cross-sectional view A-A of FIG. 5;
fig. 7 is a schematic structural view of a shaft injection device in a fourth embodiment of the blast furnace shaft injection method of the present invention.
Description of reference numerals
100-a shaft blowing device; 101-a blowing piece body; 1011-gas flow channel; 1012-cooling channels; 1012 a-first channel segment; 1012 b-second channel segment; 1012 c-third channel segment; 1013-a hard alloy layer; 1014-cooling medium inlet; 1015-fourth connecting part; 1016-media mixing interface; 1017-outlet of cooling medium; 102-a sheath; 1021-a first connection; 103-mounting the sleeve; 1031-second connecting portion; 1032-fill hole; 104-an adjusting sleeve; 1041-a third connecting portion; 105-a gap region; 200-blast furnace; 201-furnace refractory layer; 202-furnace wall cooling wall; 203-furnace shell; 204-furnace wall cooling wall water pipe; 205-blast furnace center line; 300-air supply surrounding pipe; 301-a surrounding pipe refractory layer; 302-a surround tube housing; 400-air supply device; 500-valve.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Before describing embodiments of the present invention in detail, the present invention will be described in an application environment. The technology of the invention is mainly applied to the technical field of low-carbon smelting of blast furnaces, in particular to the technical field of conveying and blowing high-temperature, high-pressure and reducing gas into the blast furnaces. High-temperature, high-pressure and reducing media are conveyed and blown from the furnace body part of the blast furnace to the interior of the blast furnace, so that the reducing media can be reasonably distributed in the interior of the blast furnace and fully contact and react with the iron-containing raw material, and the problems of low reaction efficiency and high carbon emission are solved.
Referring to fig. 1 and 2, in one embodiment, the present application provides a blast furnace shaft injection method comprising the steps of:
at least one set of furnace body blowing device 100 penetrating through the furnace wall of the furnace body and extending into the interior of the blast furnace is arranged at the furnace body part of the blast furnace 200, and the furnace body blowing device 100 is used for blowing reducing media into the interior of the blast furnace. When the number of the furnace body blowing devices 100 is plural, the plural sets of the furnace body blowing devices are uniformly arranged along the circumferential direction of the furnace body.
A valve 500 is installed on the shaft injection device 100, and the valve 500 is controlled to adjust the flow rate and flow velocity of the reducing agent injected into the interior of the blast furnace 200.
In the embodiment, the furnace body injection device is arranged at the furnace body part to inject the reducing medium into the blast furnace from the furnace body part, so that the injected reducing medium can directly reach the interior of a material layer in the furnace, and the reasonable distribution of the reducing medium in the furnace is facilitated; based on this, through the flow and the velocity of flow of valve control reducing medium, be favorable to the material of reducing medium and stove bed of material to fully contact the reaction, raise the efficiency reduces carbon and discharges.
Referring to fig. 1 and 2, in an embodiment, the stack injection device 100 includes a stack injection member, the stack injection member includes an injection member main body 101, an air flow channel 1011 is disposed in the injection member main body 101 and axially penetrates the injection member main body 101, a front end of the injection member main body 101 extends into the blast furnace 200, and a valve 500 is mounted at a rear end of the injection member main body 101.
The reducing medium flows through the valve 500 and enters the rear end of the airflow channel 1011, and is sprayed out from the front end of the airflow channel 1011 to enter the interior of the blast furnace, and the valve 500 is controlled to regulate the flow and the flow rate of the reducing medium entering the airflow channel 1011. The valve 500 may be a stop valve or a regulating valve.
In one embodiment, the plurality of sets of shaft injection members extend into the blast furnace through the shaft of the blast furnace, the valves mounted on the shaft injection members are stop valves, the valves have an opening and closing function, and the flow rate and the flow velocity of the reducing medium fed into the blast furnace are adjusted by controlling the opening number of the valves.
In one embodiment, the valve installed on the furnace body injection member is a regulating valve, the valve has a flow regulating function, and the flow rate of the reducing medium fed into the blast furnace are regulated by controlling the opening degree of the valve.
Referring to fig. 1 to 7, in some embodiments, a cooling channel 1012 is provided in the blow piece body 101, which is distributed outside the air flow channel 1011, the cooling channel 1012 including a first channel section 1012a, a second channel section 1012b distributed on the front end side wall of the blow piece body 101, and a third channel section 1012c distributed on the rear end side wall of the blow piece body 101, the first channel section 1012a being connected at its rear end with a cooling medium inlet 1014, and the third channel section 1012c being connected at its rear end with a cooling medium outlet 1017. Wherein, the cooling medium inlet 1014 can be externally connected with a water pipe, and the water pipe sends cooling water into the cooling medium inlet 1014.
The cooling medium is fed into the first channel section 1012a from the cooling medium inlet 1014, is axially conveyed along the injector body 101 through the first channel section 1012a to the front end of the injector body 101 and enters the second channel section 1012b, flows curvilinearly in the second channel section 1012b to the rear end of the second channel section 1012b and enters the third channel section 1012c, and flows axially back and forth along the injector body 101 in the third channel section 1012c and is discharged along the cooling medium outlet 1017. The cooling medium is directly conveyed to the front end of the blowing piece main body 101 through the first channel section 1012a, so that the low-temperature cooling medium which newly enters the cooling channel 1012 can be quickly conveyed to a high-heat-load area at the front end of the blowing piece main body 101; the cooling medium flows along the circumferential reciprocating curve of the injection piece main body 101 in the second cooling section 1012b, so that the flow direction of the cooling medium is frequently changed, high-speed flow winding of the cooling medium in a high-heat-load area at the front end of the injection piece main body 101 is facilitated, heat can be quickly taken away, bubbles generated by heating can be quickly taken away, the front end of the first channel section 1012a and the second channel section 1012b are distributed on the same wall thickness layer at the front end of the injection piece main body 101, namely the front end of the first channel section 1012a and the second channel section 1012b are distributed on the same circumference at the front end of the injection piece main body 101, the layout is compact and reasonable, the wall thickness of the injection piece main body 101 is facilitated to be reduced, the weight of a product is reduced, and the cost is reduced.
Referring to fig. 5 and 6, in an embodiment, a first channel section 1012a extends from the rear end of the blowing piece body 101 to the front end of the blowing piece body 101 along the axial direction of the blowing piece body 101, a second channel section 1012b is a corrugated structure extending along the axial direction of the blowing piece body 101, the front end of the second channel section 1012b is communicated with the front end of the first channel section 1012a, a third channel section 1012c is a reciprocating channel section arranged in parallel along the axial direction of the blowing piece body 101, and the front end of the third channel section 1012c is communicated with the rear end of the second channel section 1012 b. The third channel section 1012c is arranged at the rear end of the blowing piece main body 101, the third channel section 1012c is located in a low heat load area at the rear end of the blowing piece main body 101, and the flow direction change times and the flow speed of the cooling medium in the third channel section 1012c are few, so that the flow resistance is reduced, and the resistance loss of the cooling medium of the equipment is reduced.
Referring to fig. 6, in one embodiment, the cooling medium enters the first channel section 1012a from the cooling medium inlet 1014, enters the second channel section 1012b along the flow path a1 to reach the front end of the first channel section 1012a, sequentially flows through the second channel section 1012b, sequentially passes through the paths b1, b2, b3, b4, b5, b6, b7, and b8, enters the third channel section 1012c, sequentially flows through the paths c1, c2, and c3, and is discharged from the third channel section through the cooling medium outlet 1017.
Referring to fig. 1, in an embodiment, the rear end of the air flow channel 1011 is a circular channel, and the front end is a tapered channel or a laval tube type channel, so that the flow velocity of the medium can be continuously increased when the medium passes through the front end of the air flow channel 1011. The number of the air outlets at the front end of the air flow channel 1011 can be one, two or more, and in this embodiment, there is one air outlet at the front end of the air flow channel 1011.
Referring to fig. 3, in an embodiment, the inner side wall of the front end of the air flow channel 1011 is a conical structure, and the outer side wall of the front end of the injection member main body 101 is a cylindrical surface, that is, the wall thickness of the front end of the injection member main body 101 is uneven, and the deeper part of the wall thickness extending into the furnace is thicker, on one hand, because the temperature of the center in the furnace is higher, the flowing speed of the solid material is fast, and the thicker the wall thickness is, the better the wear resistance of the injection member main body 101 is improved, and the injection conveying performance is ensured.
Referring to fig. 5, in an embodiment, the inner side wall and the outer side wall of the front end of the air flow channel 1011 are both of a tapered structure, and the taper of the tapered surface of the outer side wall of the front end of the air flow channel 1011 is the same as the taper of the tapered surface of the inner side wall, that is, the wall thickness of the front end of the injection member main body 101 is the same, so that the cooling effect is more uniform due to uniform wall thickness, and it is ensured that the injection member main body 101 can perform injection operation durably and reliably at a reasonable working temperature.
Referring to fig. 1, 3, 5 and 7, in some embodiments, the shaft blower further comprises a sheath 102, the sheath 102 is disposed on the outer sidewall of the rear end of the blower body 101, and the inner sidewall of the sheath 102 is closely attached to the outer sidewall of the rear end of the blower body 101. The outer wall of the blowing piece main body 101 is wrapped by the sheath 102, which is beneficial to improving the structural strength of the blowing piece main body 101 so as to ensure the blowing performance.
Referring to fig. 1, 3, 5 and 7, in some embodiments the overall outer profile of the shaft blowing element can be round rod-shaped or round frustum-shaped.
Referring to fig. 1, 3, 5 and 7, in some embodiments, the sheath 102 may be a cylindrical structure, and the sheath 102 is disposed on the blowing piece body 101 and is sealed and fixed with the blowing piece body 101 by welding, bonding or other fixing means.
Referring to figures 1, 3, 5, and 7, in some embodiments, the sheath 102 can be integrally formed with the blowing piece body 101.
Referring to fig. 2 and 4, in some embodiments, the blast furnace includes a furnace body, a shaft injection device 100 is mounted on the furnace body, a front end of an injection piece body 101 extends from the furnace body into the furnace body, and the injection piece body is rigidly connected to the furnace body of the furnace body either directly or indirectly. The number of parts for installing and fixing the furnace body injection piece is reduced, the structure is simplified, and the installation operation is simpler and more convenient.
Optionally, the furnace body includes a furnace refractory layer 201, a furnace wall cooling wall 202 and a furnace shell 203 which are sequentially distributed from inside to outside, that is, distances from the furnace refractory layer 201, the furnace wall cooling wall 202 and the furnace shell 203 to a blast furnace center line 205 are sequentially increased. The furnace wall cooling wall 202 is provided with a cooling wall water pipe 204, and one end of the cooling wall water pipe 204 extends out of the furnace shell 203.
Referring to fig. 1 and 2, in one embodiment, the shaft injection device further includes a mounting sleeve 103, the mounting sleeve 103 is sleeved on the shaft injection element, and the shaft injection element is mounted on the shaft of the blast furnace 200 through the mounting sleeve 103. The furnace body injection member is rigidly connected with the furnace body of the blast furnace through a mounting sleeve 103; the mounting sleeve 103 penetrates through the furnace shell 203 and extends into the furnace wall cooling wall 202, and is welded and fixed with the furnace shell 203 in a welding mode, and the front end of the furnace body blowing piece extends into the mounting sleeve 103 and is fixedly connected with the mounting sleeve 103 through a bolt.
During installation, set up first round hole on the stove outer covering 203 of blast furnace 200, reserve the second round hole that corresponds with first round hole on the brickwork stave 202 of blast furnace 200, it is downthehole and fixed through welding mode and stove outer covering 203 to pass first round hole with installation cover 103, passes installation cover 103 with the front end of shaft jetting spare and stretches into in the blast furnace 200 and be connected with installation cover 103. The shaft jetting piece can be directly installed on the shaft of the blast furnace 200 through the installation sleeve 103, so that the installation structure is simplified, the installation operation is simple, and the strength of the installation structure is guaranteed, so that the reducing medium can be continuously and stably jetted into the blast furnace from the shaft part through the shaft jetting device 100, the jetting performance is guaranteed, and the reasonable distribution of the reducing medium in the blast furnace is facilitated.
Alternatively, the mounting sleeve 103 may be a cylindrical structure.
Optionally, the mounting sleeve 103 may be made of a hard high-temperature-resistant material, and the sheath 102 may also be made of a hard high-temperature-resistant material, which may be steel. The blowing piece main body 101 is assembled and connected with the mounting sleeve 103 through the sheath 102, so that the contact area is increased, and the structural connection is stable and reliable.
Referring to fig. 7, in one embodiment the shaft blowing device 100 further comprises an adjustment sleeve 104, on which a first connection 1021 is provided, on which a second connection 1031 is provided, on the mounting sleeve 103, and which sleeve 104 is placed over the shaft blowing element between the first connection 1021 and the second connection 1031. During installation, the adjusting sleeve 104 is sleeved on the furnace body blowing piece, two ends of the adjusting sleeve 104 are detachably connected with the first connecting part 1021 and the second connecting part 1031 respectively, and the length of the adjusting sleeve 104 is adjusted to adjust the length of the furnace body blowing piece extending into the blast furnace 200, so that the blowing position of the furnace body blowing piece reaches the designated position, and the reducing medium is conveyed and blown to the designated position.
Optionally, the length of the adjusting sleeve 104 may be adjusted by replacing adjusting sleeves with different lengths, or by using an adjusting sleeve with a length adjusting function.
Optionally, the adjusting sleeve 104 may be a cylindrical structure, the two ends of the adjusting sleeve 104 are both provided with third connecting portions 1041, and the third connecting portions 1041 at the two ends are detachably connected to the first connecting portion 1021 and the second connecting portion 1031, respectively. Further, the third connecting portion 1041 may be a flange, and the third connecting portion 1031 is connected to the first connecting portion 1021 and the second connecting portion 1031 by bolts, so that the assembly, disassembly and replacement are quick and convenient. Wherein, the bolt can directly pass first connecting portion 1021, third connecting portion 1041 and second connecting portion 1031 and link to each other furnace body jetting piece, adjusting collar 104 and installation cover 103 snap-on, has guaranteed the precision of assembly promptly, has guaranteed the intensity of structure again.
In the above embodiment, the adjusting sleeve 104 is arranged to adjust the depth of the furnace body blowing piece extending into the blast furnace 200 quickly and conveniently, and the adjusting operation is low in difficulty and flexible and convenient to adjust, so that the furnace body blowing piece can adapt to different working condition requirements, and the application range is wider.
Referring to fig. 7, in an embodiment, a first connection portion 1021 is provided on the jacket 102 of the shaft blowing element, and the first connection portion 1021 can be directly detachably connected with a second connection portion 1031 when the adjustment sleeve 104 does not need to be mounted. Further, first connecting portion 1021 and second connecting portion 1031 can be the flange, through bolted connection between first connecting portion 1021 and the second connecting portion 1031, simple structure, and the manufacturing degree of difficulty is low, and dismouting easy operation is convenient, the cost is reduced.
Referring to fig. 7, in one embodiment, gap regions 105 are left between the adjustment sleeve 104 and the shaft blowing element and between the mounting sleeve 103 and the shaft blowing element, filling openings 1032 are provided in the mounting sleeve 103, which are in communication with the gap regions 105, and a flowing refractory material is fed from the filling openings 1032 into the gap regions 105 to solidify and fill the gap regions. The gaps between the furnace body injection piece and the mounting sleeve 103 and between the furnace body injection piece and the sheath 102 are filled with refractory materials, so that the structure is more stable and reliable on one hand, the fire resistance of the equipment is improved on the other hand, and the high-temperature working environment is favorably adapted. In addition, the refractory material can block the overflow of gas or substances in the blast furnace.
Referring to figures 1, 3, 5 and 7, in some embodiments, the sheath 102, the mounting sleeve 103 and the adjustment sleeve 104 can all be made of hard, high temperature resistant material, and the mouthpiece body 101 can be made of a thermally conductive material. On the one hand, the high strength performance of the structure is guaranteed, and on the other hand, high-strength cooling capacity can be provided.
Optionally, the sheath 102, the mounting sleeve 103 and the adjusting sleeve 104 may all be made of steel, so that the structural strength is high; the injection part body 101 can be made of copper or aluminum, and has good heat conduction performance, so that a cooling channel arranged in the injection part body 101 can quickly take away heat under the action of a cooling medium, the working temperature of equipment is reduced, and long-term stable operation of the equipment is facilitated.
Referring to fig. 1, 3, 5 and 7, in some embodiments, the blowing member body 101 is made of copper or aluminum, the sheath 102 is made of steel, the outer wall of the front end of the blowing member body 101 is provided with a hard alloy layer 1013, and the sheath 102 and the hard alloy layer 1013 cooperate to cover the outer wall of the shaft blowing member. The sheath 102 and the hard alloy layer 1013 cooperate to protect the blowing member main body 101, thereby ensuring the structural strength of the furnace body blowing member and the service life of the furnace body blowing member. The hard alloy layer 1013 may be applied by a build-up welding method, an electroplating method, or other methods to cover the front end side wall and the front end wall of the injection member main body 101, thereby improving the wear resistance and high temperature resistance of the injection member main body 101.
Referring to fig. 1, 3, 5 and 7, in some embodiments a media mixing interface 1016 is provided obliquely on the rear end side wall of the shaft blowing element, which communicates with the air flow channel 1011. When the valve 500 is opened, other media are introduced into the airflow channel 1011 along the media mixing interface 1016 to be mixed with the reducing media to obtain a mixed medium, and the mixed medium is sprayed into the blast furnace 200 along the airflow channel 1011; when the valve 500 is closed, inert gas is continuously introduced into the gas flow channel 1011 along the media mixing interface to prevent furnace material from blocking the tuyere. The same structural design can adapt to different working condition requirements, and the structure is simple and the cost is low.
Optionally, a desired medium may be introduced into the air flow channel 1011 through the medium mixing port 1016 according to different operating condition requirements. For example, the media mixing interface 1016 may be used to mix and inject cryogenic reducing gas or other fuel into the gas flow path 1011, where the fuel may be other media such as solid fuel, gaseous fuel, or liquid fuel; or the medium mixing interface 1016 can be used for injecting inert gases such as nitrogen or argon and the like, so that the blockage of a furnace body blowing tuyere by materials in the blast furnace can be effectively prevented. The medium mixing interface 1016 is obliquely arranged, so that an included angle formed by the medium mixing interface 1016 and the front end of the blowing piece main body 101 is an obtuse angle, and the medium mixing interface 1016 and the blowing piece main body 101 form a fixed angle, so that the medium can be mixed conveniently.
Referring to fig. 2 and 4, in some embodiments, the rear end of the shaft injection member is connected to the air supply shroud 300 through the air supply device 400, and the injection medium to be injected into the blast furnace 200 is fed to the side of the blast furnace 200 through the air supply shroud 300, and then fed into the air flow path 1011 of the shaft injection member by the delivery device 400, and injected into the blast furnace 200 by the shaft injection member. Wherein, air supply bustle pipe 300 includes bustle pipe shell 302, is equipped with bustle pipe resistant material layer 301 in the bustle pipe shell 302, and bustle pipe resistant material layer 301 is as the inside lining of bustle pipe shell 302, and bustle pipe shell 302 can be made by the steel, and bustle pipe resistant material layer 301 is made by high temperature resistant material, is favorable to adapting to high temperature operation environment.
According to the blast furnace shaft injection method, the reducing medium is stably injected into the blast furnace from the blast furnace shaft by the shaft injection device, and the cooling channel reasonably arranged on the shaft injection device is favorable for forming a stable heat transfer system, so that the equipment stably and reliably works at a reasonable temperature, and is favorable for injecting the reducing medium to a specified position in the furnace, so that the reducing medium is fed into the furnace through the shaft injection device to form a reasonable distribution state and is fully combined with the iron-containing raw material in the furnace, the chemical reaction kinetic condition is improved, and the carbon emission is effectively reduced.
In the description of the present specification, reference to the description of the terms "present embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A blast furnace shaft injection method is characterized by comprising the following steps:
installing at least one set of furnace body blowing device which penetrates through a furnace wall of a furnace body and extends into the interior of the blast furnace at the furnace body part of the blast furnace, wherein the furnace body blowing device is used for blowing reducing media into the interior of the blast furnace; when the number of the furnace body blowing devices is multiple, the multiple sets of the furnace body blowing devices are uniformly arranged along the circumferential direction of the furnace body;
and installing a valve on the furnace body blowing device, and controlling the valve to adjust the flow and the flow velocity of the reducing medium sprayed into the blast furnace.
2. The blast furnace shaft blowing method according to claim 1, characterized in that: the furnace body blowing device comprises a furnace body blowing piece, the furnace body blowing piece comprises a blowing piece main body, an airflow channel which penetrates through the blowing piece main body along the axial direction of the blowing piece main body is arranged in the blowing piece main body, the front end of the blowing piece main body extends into the blast furnace, and the rear end of the blowing piece main body is provided with the valve;
and enabling the reducing medium to flow through a valve and then enter the rear end of the airflow channel, spraying the reducing medium from the front end of the airflow channel into the blast furnace, and controlling the valve to adjust the flow and flow rate of the reducing medium entering the airflow channel.
3. The blast furnace shaft blowing method according to claim 2, characterized in that: a cooling channel distributed on the outer side of the airflow channel is arranged in the injection part main body, the cooling channel comprises a first channel section, a second channel section distributed on the side wall of the front end of the injection part main body and a third channel section distributed on the side wall of the rear end of the injection part main body, the rear end of the first channel section is connected with a cooling medium inlet, and the rear end of the third channel section is connected with a cooling medium outlet;
the method comprises the steps that a cooling medium is input into a first channel section from a cooling medium inlet, the cooling medium is conveyed to the front end of a blowing piece main body along the axial direction of the blowing piece main body through the first channel section and enters a second channel section, the cooling medium flows to the rear end of the second channel section in a curve mode and enters a third channel section, and the cooling medium flows in a reciprocating mode along the axial direction of the blowing piece main body in the third channel section and is discharged along a cooling medium outlet.
4. The blast furnace shaft blowing method according to claim 3, characterized in that: the first channel section is formed by extending the rear end of the injection piece body to the front end of the injection piece body along the axial direction of the injection piece body, the second channel section is of a wave-shaped structure extending along the axial direction of the injection piece body, the front end of the second channel section is communicated with the front end of the first channel section, the third channel section is a reciprocating channel section arranged in parallel along the axial direction of the injection piece body, and the front end of the third channel section is communicated with the rear end of the second channel section.
5. The blast furnace shaft blowing method according to claim 2, characterized in that: the furnace body blowing piece further comprises a sheath, the sheath is arranged on the outer side wall of the rear end of the blowing piece main body, and the inner side wall of the sheath is tightly attached to the outer side wall of the rear end of the blowing piece main body.
6. The blast furnace shaft blowing method according to claim 1 or 5, characterized in that: the furnace body injection device also comprises an installation sleeve, the installation sleeve is sleeved on the furnace body injection piece, and the furnace body injection piece is installed on the furnace body of the blast furnace through the installation sleeve;
during installation, a first round hole is formed in a furnace shell of the blast furnace, a second round hole corresponding to the first round hole is reserved in a furnace wall cooling wall of the blast furnace, the installation sleeve penetrates through the first round hole and extends into the second round hole and is fixed with the furnace shell in a welding mode, and the front end of a furnace body injection piece penetrates through the installation sleeve and extends into the blast furnace and is connected with the installation sleeve.
7. The blast furnace shaft blowing method according to claim 1, characterized in that: the furnace body blowing device further comprises an adjusting sleeve, a first connecting part is arranged on the furnace body blowing piece, a second connecting part is arranged on the mounting sleeve, and the adjusting sleeve is sleeved on a part of the furnace body blowing piece, which is located between the first connecting part and the second connecting part;
during installation, the adjusting sleeve is sleeved on the furnace body injection piece, two ends of the adjusting sleeve are respectively detachably connected with the first connecting portion and the second connecting portion, and the length of the adjusting sleeve is adjusted to adjust the length of the furnace body injection piece extending into the blast furnace, so that the injection position of the furnace body injection piece reaches a designated position.
8. The blast furnace shaft blowing method according to claim 7, characterized by comprising: and gap areas are reserved between the adjusting sleeve and the furnace body blowing piece and between the mounting sleeve and the furnace body blowing piece, filling holes communicated with the gap areas are formed in the mounting sleeve, and the flowing refractory material is conveyed into the gap areas from the filling holes to be solidified and filled in the gap areas.
9. The blast furnace shaft blowing method according to claim 5, characterized in that: the blowing piece body is made of copper or aluminum, and the sheath is made of steel; and a hard alloy layer is arranged on the outer wall of the front end of the blowing piece main body, and the outer wall of the furnace body blowing piece is covered by the sheath and the hard alloy layer in a matched mode.
10. The blast furnace shaft blowing method according to claim 1, characterized in that: a medium mixing interface communicated with the airflow channel is obliquely arranged on the side wall of the rear end of the furnace body injection piece; when the valve is opened, other media are introduced into the airflow channel along the media mixing interface to be mixed with the reducing media so as to obtain a mixed medium, and the mixed medium is sprayed into the blast furnace along the airflow channel; when the valve is closed, inert gas is continuously introduced into the gas flow channel along the medium mixing interface to prevent the furnace material from blocking the tuyere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211372633.6A CN115786606A (en) | 2022-11-02 | 2022-11-02 | Blast furnace shaft blowing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211372633.6A CN115786606A (en) | 2022-11-02 | 2022-11-02 | Blast furnace shaft blowing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010215993A (en) * | 2009-03-18 | 2010-09-30 | Jfe Steel Corp | Inner part water-cooling type tuyere in blast furnace |
| CN109161621A (en) * | 2018-11-19 | 2019-01-08 | 东北大学 | A kind of two-part blast-furnace coal injection device |
| CN211339575U (en) * | 2019-12-30 | 2020-08-25 | 内蒙古赛思普科技有限公司 | Reducing gas spray gun for molten pool blowing of smelting reduction furnace |
| CN114854916A (en) * | 2022-05-17 | 2022-08-05 | 中冶赛迪工程技术股份有限公司 | Supersonic tuyere injection device and design method |
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2022
- 2022-11-02 CN CN202211372633.6A patent/CN115786606A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010215993A (en) * | 2009-03-18 | 2010-09-30 | Jfe Steel Corp | Inner part water-cooling type tuyere in blast furnace |
| CN109161621A (en) * | 2018-11-19 | 2019-01-08 | 东北大学 | A kind of two-part blast-furnace coal injection device |
| CN211339575U (en) * | 2019-12-30 | 2020-08-25 | 内蒙古赛思普科技有限公司 | Reducing gas spray gun for molten pool blowing of smelting reduction furnace |
| CN114854916A (en) * | 2022-05-17 | 2022-08-05 | 中冶赛迪工程技术股份有限公司 | Supersonic tuyere injection device and design method |
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