CN117187458A - Low-carbon blast furnace and reducing gas injection method thereof - Google Patents
Low-carbon blast furnace and reducing gas injection method thereof Download PDFInfo
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- CN117187458A CN117187458A CN202311279463.1A CN202311279463A CN117187458A CN 117187458 A CN117187458 A CN 117187458A CN 202311279463 A CN202311279463 A CN 202311279463A CN 117187458 A CN117187458 A CN 117187458A
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- Prior art keywords
- reducing gas
- blast furnace
- furnace
- tuyere
- low
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 title claims description 21
- 239000007924 injection Substances 0.000 title claims description 21
- 238000007664 blowing Methods 0.000 claims abstract description 30
- 210000001015 abdomen Anatomy 0.000 claims abstract description 22
- 239000000571 coke Substances 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 3
- 238000011946 reduction process Methods 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Manufacture Of Iron (AREA)
Abstract
The invention relates to a low-carbon blast furnace and a reducing gas blowing method thereof, which belong to the technical field of blast furnaces, and reducing gas is blown from a blast furnace belly below a reflow zone to reduce edge furnace burden; the technological parameters of the blast furnace tuyere are regulated to increase the diameter of the swirling area, so that the reducing gas generated in the tuyere swirling area flows to the middle of the blast furnace to reduce the burden in the middle. The invention sprays the reducing gas from the furnace belly, which not only has enough reducing height, but also can fully utilize the reducing gas to reduce furnace burden, and can heat the reducing gas to meet the thermodynamic and kinetic conditions required by reduction, and simultaneously avoid the loss of coke in the oxidation and reduction process of the tuyere convolution area when the reducing gas enters from the tuyere.
Description
Technical Field
The invention belongs to the technical field of blast furnaces, and relates to a low-carbon blast furnace and a reducing gas injection method thereof.
Background
The low-carbon blast furnace generally adopts a blowing medium to replace part of coke, the blowing medium comprises a reducing medium and a non-reducing medium, the reducing medium comprises reducing gases such as hydrogen, CO and the like, the non-reducing medium comprises materials such as methane, heavy oil, coal dust, plastics and the like which need to be combusted to react to generate CO and hydrogen, the non-reducing medium is generally sprayed through a tuyere, CO and hydrogen are generated by combustion in a swirling zone, and the spraying position of the reducing gases is provided with two main positions at present, one is the middle lower part of an upper furnace body of a reflow zone, and the other is sprayed from the tuyere. Both of these locations have problems: the temperature of furnace burden and reducing gas at the position above the reflow zone is low, thermodynamic and kinetic conditions of the reduction reaction are insufficient, the height interval of the reduction reaction is small, the reducing gas reaches the furnace top when the iron oxide is not fully reduced, and the utilization rate of the reducing gas is low; the reducing gas sprayed into the tuyere will oxidize first in the tuyere convolution zone and then reduce to CO and hydrogen in the tuyere convolution zone, so that oxygen and coke are consumed and the burning efficiency of other blowing mediums in the tuyere may be lowered.
Disclosure of Invention
In view of the above, the present invention aims to provide a low-carbon blast furnace and a method for injecting reducing gas thereof, which can improve the utilization rate of the reducing gas and realize low-carbon smelting.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a reducing gas injection method of a low-carbon blast furnace, wherein reducing gas is injected from a blast furnace hearth positioned below a reflow zone, the injected reducing gas is heated by furnace burden near the hearth, and the furnace burden at the blast furnace edge is reduced upwards along the blast furnace edge; the technological parameters of the blast furnace tuyere are regulated to increase the diameter of the swirling area, so that the reducing gas generated in the tuyere swirling area flows to the middle of the blast furnace to reduce the burden in the middle.
Alternatively, the burden of coke on the edge of the blast furnace is high and the burden of coke in the middle of the blast furnace is low when the material is distributed.
Optionally, the wind speed of the blast furnace tuyere is slightly lower than the limit wind speed when the diameter of the tuyere convolution zone reaches the maximum.
Optionally, the reducing gas is blown from a position in the middle of the furnace belly of the blast furnace.
The low-carbon blast furnace comprises a furnace body, a blowing system arranged at the position corresponding to the tuyere of the furnace body, and a reducing gas blowing system with a blowing port positioned at the furnace belly of the furnace body for reducing the edge furnace burden, wherein the blowing port of the reducing gas blowing system is positioned below the reflow zone; the diameter of the tuyere of the furnace body is adjustable so as to increase the diameter of the swirling zone, and the reducing gas generated in the swirling zone of the tuyere flows to the middle of the blast furnace to reduce the burden in the middle.
Optionally, the blowing port of the reducing gas blowing system is positioned in the middle section of the furnace belly of the furnace body.
Optionally, the reducing gas injection system comprises a reducing gas injection gun, and the reducing gas injection gun is of a double-section structure and comprises a cold end pipe and a hot end pipe detachably connected with the cold end pipe.
Optionally, the cold end pipe is a ductile metal pipe, and the hot end pipe is a high temperature resistant ceramic pipe or other high temperature resistant material pipe.
The invention has the beneficial effects that: the reducing gas is sprayed from the furnace belly, so that not only is the reducing gas sufficient for reducing furnace burden, but also the reducing gas can be heated by the furnace burden, the thermodynamic and kinetic conditions required by reduction are met, meanwhile, the loss of coke in the oxidation and reduction process of the tuyere convolution region when the reducing gas enters from the tuyere is avoided, low-carbon smelting is realized, in addition, the reduction of iron ore is roughly divided into two regions, the edge of the iron ore is mainly reduced by the reducing gas sprayed from the furnace belly part, the middle of the iron ore is mainly reduced by the reducing gas generated by the tuyere convolution region, and the reducing gas sprayed from the furnace belly part has the effect of reducing the temperature of the edge furnace burden due to lower temperature, so that the service life of blast furnace cooling equipment is prolonged.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a low-carbon blast furnace according to the present invention;
FIG. 2 is a schematic diagram of an arrangement position of a reducing gas injection system;
fig. 3 is a schematic view of the structure of the reducing gas injection lance.
Reference numerals: the reducing gas injection system 1, the injection system 2, the valve 3, the cold end pipe 4 and the hot end pipe 5.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 3, a reducing gas injection method of a low-carbon blast furnace injects reducing gas from a hearth of the blast furnace below a reflow zone, the injected reducing gas is heated by a burden near the hearth, and reduces the blast furnace edge burden upward along the blast furnace edge; the technological parameters of the blast furnace tuyere are regulated to increase the diameter of the swirling area, so that the reducing gas generated in the tuyere swirling area flows to the middle of the blast furnace to reduce the burden in the middle.
The invention sprays the reducing gas from the furnace belly, which not only has enough reducing height, but also can fully utilize the reducing gas to reduce furnace burden, and can heat the reducing gas through the furnace burden, thereby meeting the thermodynamic and kinetic conditions required by reduction, and simultaneously avoiding the loss of coke in the oxidation and reduction process of the tuyere convolution area when the reducing gas enters from the tuyere.
Optionally, when the material is distributed, the coke load on the edge of the blast furnace is large, and the coke load on the middle part of the blast furnace is small; the wind speed of the blast furnace tuyere is slightly lower than the limit wind speed when the diameter of the tuyere convolution zone reaches the maximum; reducing gas is injected from the middle section of the furnace belly of the blast furnace.
The low-carbon blast furnace comprises a traditional material distribution system, a blowing system 2, a smelting system, an iron tapping system and a cooling system, wherein the blowing system 2 is arranged corresponding to the position of a blast furnace body air port, the low-carbon blast furnace further comprises a reducing gas blowing system 1 with a blowing port positioned at the furnace body belly for reducing edge furnace materials, and the blowing port of the reducing gas blowing system 1 is positioned below a reflow zone; the diameter of the tuyere of the furnace body is adjustable so as to increase the diameter of the swirling zone, and the reducing gas generated in the swirling zone of the tuyere flows to the middle of the blast furnace to reduce the burden in the middle.
Optionally, a blowing port of the reducing gas blowing system 1 is positioned in the middle section of the furnace belly of the furnace body; the reducing gas injection system 1 comprises a reducing gas injection gun which is of a double-section structure and comprises a cold end pipe 4 and a hot end pipe 5 detachably connected with the cold end pipe 4, wherein a valve 3 is arranged at the tail part of the cold end pipe 4; the cold end pipe 4 passing through the cooling wall part can be a ductile metal pipe, and the hot end pipe 5 passing through the refractory part can be a high temperature resistant ceramic pipe or other high temperature resistant material pipe; the hot end pipe 5 and the cold end pipe 4 are easy to be connected by screw threads, and are convenient to replace.
Aiming at the problem of the existing reducing gas spraying scheme and combining the service life problem of the blast furnace, the invention provides the method for spraying the reducing gas at the furnace belly part, and takes the reducing efficiency problem of the reducing gas into consideration, and makes corresponding adjustment in the aspects of a distribution system and a blowing system, thereby realizing the effect of low-carbon smelting.
Examples
A low-carbon blast furnace comprises a furnace top material distribution system, a tuyere coal dust and high-temperature blast blowing and blowing system 2, a smelting system formed by heat exchange and reduction processes of descending furnace burden and ascending gas flow in the blast furnace, a cooling system formed by a cooling wall and a cooling water pipe of the blast furnace, an iron tapping system formed by a tap hole, an iron runner and iron notch opening and blocking equipment, and a reducing gas blowing and blowing system 1 additionally arranged at a furnace belly part, wherein hydrogen is adopted as reducing gas, a cold end pipe 4 of a reducing gas spray gun is a steel pipe, a hot end pipe 5 is a ceramic pipe, and the cold end pipe 4 and the hot end pipe 5 are in threaded connection. The diameter of the tuyere is adjusted so that the wind speed is slightly lower than the limit wind speed when the diameter of the swirling zone of the tuyere reaches the maximum, and the wind speed=the wind quantity/the cross-sectional area of the tuyere. In the distribution system, the edge ore is distributed one more circle, the coke is distributed one less circle, and the distribution system can be properly adjusted according to the temperature of the top gas and the gas utilization rate.
According to the invention, a reducing gas injection system 1 is added at the position of the furnace belly of the blast furnace, injected reducing gas is heated by the furnace burden near the furnace belly and upwards along the edge, and the furnace burden at the edge is reduced; the reducing gas spraying gun in the reducing gas spraying system 1 adopts a double-section design, a cold end pipe penetrating through the cooling wall part adopts a metal pipe, a hot end pipe penetrating through the refractory part adopts a high temperature resistant pipe, and the hot end pipe 5 can be replaced; the burden of coke on the edge of a material distribution system of the blast furnace is large, and the burden of coke on the center and middle part of the blast furnace is small. According to the process, the reducing gas is sprayed from the furnace belly, so that coke is prevented from being lost in the oxidation and reduction process of the tuyere convolution zone when the reducing gas enters from the tuyere; meanwhile, the high-temperature furnace burden at the furnace belly part heats the reducing gas, so that the thermodynamic and kinetic conditions of the reducing gas for reducing iron oxide at the upper part are enhanced; the process is characterized in that the reduction of the iron ore is roughly divided into two areas in the blast furnace, the edge is mainly the reduction gas sprayed from the furnace belly part to reduce the iron ore, and the middle is mainly the reduction gas generated by the tuyere convolution area to reduce the iron ore.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (8)
1. A reducing gas injection method of a low-carbon blast furnace is characterized in that: blowing reducing gas from a blast furnace hearth located below the reflow zone, the blown reducing gas being heated by the charge near the hearth and reducing the blast furnace edge charge upwardly along the blast furnace edge; the technological parameters of the blast furnace tuyere are regulated to increase the diameter of the swirling area, so that the reducing gas generated in the tuyere swirling area flows to the middle of the blast furnace to reduce the burden in the middle.
2. The reducing gas injection method of a low-carbon blast furnace according to claim 1, wherein: when the material is distributed, the coke load on the edge of the blast furnace is large, and the coke load in the middle of the blast furnace is small.
3. The reducing gas injection method of a low-carbon blast furnace according to claim 1, wherein: the wind speed of the blast furnace tuyere is slightly lower than the limit wind speed when the diameter of the tuyere convolution zone reaches the maximum.
4. The reducing gas injection method of a low-carbon blast furnace according to claim 1, wherein: reducing gas is injected from the middle section of the furnace belly of the blast furnace.
5. The utility model provides a low-carbon blast furnace, includes the furnace body, corresponds the jetting system that furnace body wind gap position set up, its characterized in that: the reducing gas blowing system is positioned at the belly of the furnace body to reduce the edge furnace burden, and the blowing opening of the reducing gas blowing system is positioned below the reflow zone; the diameter of the tuyere of the furnace body is adjustable so as to increase the diameter of the swirling zone, and the reducing gas generated in the swirling zone of the tuyere flows to the middle of the blast furnace to reduce the burden in the middle.
6. The low carbon blast furnace according to claim 5, wherein: the blowing port of the reducing gas blowing system is positioned at the middle section of the furnace belly of the furnace body.
7. The low carbon blast furnace according to claim 5, wherein: the reducing gas injection system comprises a reducing gas injection gun which is of a double-section structure and comprises a cold end pipe and a hot end pipe detachably connected with the cold end pipe.
8. The low carbon blast furnace of claim 7, wherein: the cold end pipe is a ductile metal pipe, and the hot end pipe is a high temperature resistant ceramic pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311279463.1A CN117187458A (en) | 2023-09-28 | 2023-09-28 | Low-carbon blast furnace and reducing gas injection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311279463.1A CN117187458A (en) | 2023-09-28 | 2023-09-28 | Low-carbon blast furnace and reducing gas injection method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117187458A true CN117187458A (en) | 2023-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311279463.1A Pending CN117187458A (en) | 2023-09-28 | 2023-09-28 | Low-carbon blast furnace and reducing gas injection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117187458A (en) |
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2023
- 2023-09-28 CN CN202311279463.1A patent/CN117187458A/en active Pending
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