CN108929930B - Side-blown molten bath iron-smelting furnace - Google Patents
Side-blown molten bath iron-smelting furnace Download PDFInfo
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- CN108929930B CN108929930B CN201710388734.5A CN201710388734A CN108929930B CN 108929930 B CN108929930 B CN 108929930B CN 201710388734 A CN201710388734 A CN 201710388734A CN 108929930 B CN108929930 B CN 108929930B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
Abstract
The invention discloses a molten pool side-blown ironmaking furnace, which comprises a body and first to fifth oxygen-coal spray guns, wherein the top of the body is provided with a feeding channel and a flue gas channel, the bottom of the body is limited with a molten pool, and the molten pool is divided into a molten iron layer area, a slag layer area and a coke layer area along the downward and upward direction; the first oxygen-coal spray gun to the fifth oxygen-coal spray gun respectively penetrate through the side wall of the body, and outlet ends of the first oxygen-coal spray gun to the fifth oxygen-coal spray gun respectively and independently extend to the slag layer area, the coke layer area or a junction of the slag layer area and the coke layer area. The side-blown iron-making furnace with the molten pool can effectively enhance the material stirring of a coke layer area and a slag layer area in the molten pool, thereby obviously improving the iron-making efficiency.
Description
Technical Field
The invention belongs to the field of iron making, and particularly relates to a side-blown molten pool iron making furnace.
Background
At present, the blast furnace process is the main iron production equipment in China, although China basically masters the modern advanced blast furnace technology, the unit construction investment and the production cost are relatively low, the problems of long process, low efficiency, high energy consumption, environmental pollution and the like cause various dissatisfaction to the blast furnace process of people at present, and therefore the existing iron-making technology needs to be further improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a molten pool side-blown ironmaking furnace, by which the stirring of materials in a coke layer area and a slag layer area in a molten pool can be effectively enhanced, and the ironmaking efficiency is obviously improved.
According to one aspect of the present invention, there is disclosed a molten bath side-blown iron making furnace comprising:
the molten pool comprises a body, wherein the top of the body is provided with a feeding channel and a flue gas channel, the bottom of the body is limited with a molten pool, and the molten pool is divided into a molten iron layer area, a slag layer area and a coke layer area along the downward and upward direction;
the first oxygen-coal spray gun to the fifth oxygen-coal spray gun respectively penetrate through the side wall of the body, and outlet ends of the first oxygen-coal spray gun to the fifth oxygen-coal spray gun respectively and independently extend to the slag layer area, the coke layer area or a junction of the slag layer area and the coke layer area.
According to the side-blown molten pool iron-making furnace provided by the invention, the first to fifth oxygen-coal spray guns are arranged, so that a mixture of oxygen and pulverized coal can be sprayed into the slag layer area, the coke layer area or the junction of the slag layer area and the coke layer area, the reduction effect in the coke layer area can be obviously enhanced, and meanwhile, the residual iron ore which is not fully reduced in the slag layer area is further reduced; in addition, by adopting the blowing mode to send oxygen and pulverized coal into the molten pool, the stirring of materials in the molten pool can be effectively enhanced, and the reduction effect of iron is further improved. Therefore, the side-blown iron-making furnace of the molten pool can obviously improve the iron-making efficiency and the economic benefit.
In addition, the side-blown molten bath iron-making furnace according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the invention, the first and second oxygen-coal injection lances are penetrated by a first side wall of the body front end, the second and third oxygen-coal injection lances are penetrated by a second side wall adjacent to the first side wall, and the fourth and fifth oxygen-coal injection lances are penetrated by a third side wall adjacent to the first side wall, wherein the second and fourth oxygen-coal injection lances are disposed adjacent to the first oxygen-coal injection lance. Therefore, the oxygen and pulverized coal can be injected more uniformly, momentum diffusion in the molten pool is relatively uniform, and the reduction efficiency of iron can be effectively improved.
In some embodiments of the invention, the first through fifth oxy-coal lances each extend in an inwardly downward direction and are each angled at 45 ° to the horizontal. Therefore, the stirring of materials around the molten pool can be further enhanced, and the stirring energy is increased.
In some embodiments of the invention, the projection extensions of said first oxygen-coal lance, said third oxygen-coal lance and said fifth oxygen-coal lance all have an angle of 120 ° therebetween. This further improves the uniformity of the momentum diffusion in the blast and the molten pool, and accelerates the reduction of iron.
In some embodiments of the invention, the projections of the second and fourth oxy-coal lances are perpendicular to the projection of the first oxy-coal lance, respectively. This further improves the uniformity of the momentum diffusion in the blast and the molten pool, and accelerates the reduction of iron.
In some embodiments of the invention, the projections of the second and fourth oxy-coal lances are located within a straight line. Therefore, the distribution of the oxygen-coal spray guns can be more symmetrical, and the uniformity of the momentum diffusion in the injection and the molten pool is better.
In some embodiments of the invention, the molten bath side-blown iron furnace further comprises: the pure oxygen spray gun penetrates through the first side wall at the front end of the body and enables the outlet end of the pure oxygen spray gun to extend into the feeding channel. This can further accelerate the reduction reaction of iron.
In some embodiments of the invention, the molten bath side-blown iron furnace further comprises: a control system connected to the pure oxygen lance and the first to fifth oxy-coal lances, respectively, the control system adapted to independently control switching of the pure oxygen lance and the first to fifth oxy-coal lances and injection speeds of the pure oxygen lance and the first to fifth oxy-coal lances, respectively. Therefore, the control system can automatically and accurately control the injection flow of pure oxygen, the percentage of oxygen and pulverized coal in the oxygen-coal spray gun, the injection speed of the pulverized coal and the like according to the actual reaction condition in the iron-making furnace, so that the iron reduction in a molten pool area can be well completed under the condition that the total flow of the spray gun is very small, the momentum diffusion is not uniform, the slag splashing corrosion to a furnace lining is effectively reduced, and the service life of a furnace body is prolonged.
In some embodiments of the present invention, the injection flow rates of the first to fifth oxy-coal lances are each independently 0 to 500m3The oxygen content is 30-100% respectively, and the blowing speed of the pulverized coal is 300kg/h respectively. Therefore, the percentage of oxygen and the pulverized coal, the injection flow and the injection speed of the pulverized coal can be further controlled according to the actual reaction condition in the iron-making furnace.
In some embodiments of the present invention, the pure oxygen lance has a blowing flow rate of 0-300m3H is used as the reference value. Thereby, can be further based onThe actual reaction condition in the iron-making furnace controls the injection flow of pure oxygen.
Drawings
Fig. 1 is a schematic view of the structure of a molten bath side-blown iron making furnace according to an embodiment of the present invention.
Fig. 2 is a schematic view of the structure of the body of the molten bath side-blown iron furnace according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view of a molten bath of a side-blown molten iron furnace according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
According to one aspect of the present invention, there is disclosed a molten bath side-blown iron making furnace, as shown in fig. 1, comprising: a body 100 and an oxy-coal lance 200. Wherein, the top of the body 100 is provided with a feeding channel 110 and a flue gas channel 120, the bottom of the body 100 is limited with a molten pool 130, and the molten pool 130 is divided into a molten iron layer area 131, a slag layer area 132 and a coke layer area 133 along the downward and upward directions; the oxygen-coal injection lance 200 includes first through fifth oxygen-coal injection lances (210- > 250) that pass through the sidewall 140 of the body 100 and have outlet ends of the first through fifth oxygen-coal injection lances extend to the slag layer zone 132, the coke layer zone 133, or the intersection of the slag layer zone 132 and the coke layer zone 133, respectively.
According to the side-blown molten pool iron-making furnace provided by the invention, the first to fifth oxygen-coal spray guns are arranged, so that a mixture of oxygen and pulverized coal can be sprayed into the slag layer region 132, the coke layer region 133 or the junction of the slag layer region 132 and the coke layer region 133, the reduction effect in the coke layer region 133 can be obviously enhanced, and meanwhile, the residual iron ore which is not fully reduced in the slag layer region 132 is further reduced; in addition, by adopting the blowing mode to send oxygen and pulverized coal into the molten pool 130, the stirring of materials around the molten pool 130 can be effectively strengthened, the stirring energy is increased, and the reduction effect of iron is further improved. Therefore, the side-blown iron-making furnace of the molten pool can obviously improve the iron-making efficiency and has good economical efficiency.
The molten bath side-blown iron furnace according to the above embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.
According to an embodiment of the present invention, referring to fig. 3, the first oxygen-coal injection lance 210 may be penetrated by a first sidewall 141 of the front end of the body 100, the second oxygen-coal injection lance 220 and the third oxygen-coal injection lance 230 may be penetrated by a second sidewall 142 adjacent to the first sidewall 141, and the fourth oxygen-coal injection lance 240 and the fifth oxygen-coal injection lance 250 may be penetrated by a third sidewall 143 adjacent to the first sidewall 141, wherein the second oxygen-coal injection lance 220 and the fourth oxygen-coal injection lance 240 may be disposed adjacent to the first oxygen-coal injection lance 210. According to the specific example of the present invention, since the front end portion of the molten bath 130 is adjacent to the feeding passage 110 in the longitudinal direction, a pile is formed at the front end portion of the molten bath 130, the reduction reaction occurs around the molten bath 130 except for the pile, the central reaction is less, and the rear end of the molten bath 130 does not have a lance insertion condition due to structural factors, so that the arrangement of the oxygen-coal injection lances according to the present invention can make the injection of oxygen and pulverized coal more uniform, and make the momentum diffusion in the molten bath 130 relatively uniform, thereby effectively improving the reduction efficiency of iron.
According to the embodiment of the present invention, the first to fifth oxy-coal lances extend in an inward downward direction and are all at an angle of 45 ° to the horizontal plane. Because the front end part of the molten pool 130 can form a material pile, the reduction reaction occurs around the molten pool 130 except the material pile, and the central reaction is less, the inventor finds that when the first to fifth oxygen-coal spray guns extend along the inward downward direction and have a certain included angle with the horizontal plane, the stirring around the molten pool 130 can be effectively enhanced, the stirring energy is increased, especially when the included angles of the first to fifth oxygen-coal spray guns and the horizontal plane are all 45 degrees, the stirring of the materials around the molten pool 130 can be further enhanced, the stirring energy is obviously increased, and the reduction efficiency of iron is obviously improved.
According to the embodiment of the invention, the first to fifth oxy-coal injection guns can independently inject oxygen and pulverized coal according to actual conditions, and can also perform combined injection according to actual conditions.
Referring to fig. 3, the first oxygen-coal injection lance 210, the third oxygen-coal injection lance 230 and the fifth oxygen-coal injection lance 250 are arranged such that their projection extensions form an angle of 120 ° according to an embodiment of the present invention. The inventors found that when the second oxygen-coal injection lance 220 and the fourth oxygen-coal injection lance 240 are closed, the first oxygen-coal injection lance 210, the third oxygen-coal injection lance 230 and the fifth oxygen-coal injection lance 250 are arranged at 120 ° included angles, so that the central symmetry arrangement can be realized, which is beneficial to further improving the injection uniformity and accelerating the reduction of iron. In addition, because the rear end of the molten pool 130 does not have a lance inserting condition due to the structural factor, the defect can be effectively avoided by adopting the distribution mode of the 120-degree included angle, and the uniformity of momentum diffusion can be further improved.
According to an embodiment of the present invention, referring to fig. 3, the projections of second oxygen-coal lance 220 and fourth oxygen-coal lance 240 are perpendicular to the projection of first oxygen-coal lance 210, respectively. This further improves the uniformity of the momentum diffusion in the blast and the molten pool 130, and accelerates the reduction of iron. According to an embodiment of the present invention, the projections of second oxygen-coal lance 220 and fourth oxygen-coal lance 240 may be located within a straight line. Thus, the distribution of the oxy-coal lances may be made more symmetrical and the uniformity of the momentum spread in the injection and molten bath 130 may be better.
According to an embodiment of the present invention, referring to fig. 1, the molten bath side-blown iron furnace may further include: a pure oxygen lance 150, the pure oxygen lance 150 penetrating through the first sidewall 141 of the front end of the body 100 and extending an outlet end of the pure oxygen lance 150 into the feed channel 110. In the invention, the pure oxygen spray gun 150 is arranged, so that oxygen can be sprayed into the feeding channel 110 according to the actual situation in the production process, and the reduction reaction of iron is further accelerated.
According to an embodiment of the present invention, the pure oxygen lance 150 may be disposed in parallel with the first oxygen-coal lance 210 in the longitudinal direction, whereby the reduction effect of iron may be further improved.
According to an embodiment of the present invention, the molten bath side-blown iron furnace may further include: and a control system connected to the pure oxygen lance 150 and the first to fifth oxy-coal lances, respectively, the control system being adapted to independently control the on and off of the pure oxygen lance 150 and the first to fifth oxy-coal lances and the injection speeds of the pure oxygen lance 150 and the first to fifth oxy-coal lances, respectively. According to the invention, the control system can automatically and accurately control the injection flow of pure oxygen, the percentage of oxygen and pulverized coal in the oxygen-coal spray gun, the injection speed of the pulverized coal and the like according to the actual reaction condition in the iron-making furnace, so that the iron reduction in the area of the molten pool 130 can be well completed under the condition of very small total flow of the spray gun, the momentum diffusion is not easy to cause uneven, the slag splashing corrosion to a furnace lining is effectively reduced, and the service life of the furnace body is prolonged.
According to an embodiment of the present invention, the injection flow rates of the first to fifth oxy-coal lances are each independently 0 to 500m3The oxygen content is 30-100% respectively, and the blowing speed of the pulverized coal is 300kg/h respectively. Therefore, the percentage of oxygen and the pulverized coal, the injection flow and the injection speed of the pulverized coal can be further controlled according to the actual reaction condition in the iron-making furnace.
According to the embodiment of the invention, the blowing flow of the pure oxygen spray gun is 0-300m3H is used as the reference value. Therefore, the injection flow of the pure oxygen can be further controlled according to the actual reaction condition in the iron-making furnace.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A molten bath side-blown iron making furnace, comprising:
the molten pool comprises a body, wherein the top of the body is provided with a feeding channel and a flue gas channel, the bottom of the body is limited with a molten pool, and the molten pool is divided into a molten iron layer area, a slag layer area and a coke layer area along the downward and upward direction;
first to fifth oxy-coal injection lances which respectively penetrate through a sidewall of the body and have outlet ends thereof respectively and independently extend to the slag layer zone, the coke layer zone or a junction of the slag layer zone and the coke layer zone,
wherein the first oxygen-coal spray gun penetrates through a first side wall at the front end of the body, the second oxygen-coal spray gun and the third oxygen-coal spray gun penetrate through a second side wall adjacent to the first side wall, the fourth oxygen-coal spray gun and the fifth oxygen-coal spray gun penetrate through a third side wall adjacent to the first side wall, the second oxygen-coal spray gun and the fourth oxygen-coal spray gun are arranged adjacent to the first oxygen-coal spray gun, the second oxygen-coal spray gun, the third oxygen-coal spray gun and the fifth oxygen-coal spray gun all extend along an inward downward direction, the included angles between the first oxygen-coal spray gun, the third oxygen-coal spray gun and the fifth oxygen-coal spray gun and the horizontal plane are 45 degrees, the included angles between extension lines of the projections of the first oxygen-coal spray gun, the third oxygen-coal spray gun and the fifth oxygen-coal spray gun are 120 degrees, and the projections of the second oxygen-coal spray gun and the fourth oxygen-coal, the projections of the second and fourth oxy-coal lances lie in a straight line.
2. The side-of-bath ironmaking furnace of claim 1, further comprising:
the pure oxygen spray gun penetrates through the first side wall at the front end of the body and enables the outlet end of the pure oxygen spray gun to extend into the feeding channel.
3. The side-of-bath ironmaking furnace of claim 2, further comprising:
a control system connected to the pure oxygen lance and the first to fifth oxy-coal lances, respectively, the control system adapted to independently control switching of the pure oxygen lance and the first to fifth oxy-coal lances and injection speeds of the pure oxygen lance and the first to fifth oxy-coal lances, respectively.
4. The molten bath side-blown iron furnace of claim 3, wherein the injection flow rates of the first to fifth oxy-coal lances are each independently 0 to 500m3The oxygen content is 30-100% respectively, and the blowing speed of the pulverized coal is 300kg/h respectively.
5. The side-blown molten bath iron-making furnace according to claim 4, wherein the pure oxygen lance has a blowing flow rate of 0 to 300m3/h。
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| CN108929930B true CN108929930B (en) | 2020-10-27 |
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| CN115652010A (en) * | 2022-09-29 | 2023-01-31 | 攀钢集团西昌钢钒有限公司 | Efficient heat exchange smelting reduction iron-making method and device |
| CN115652007A (en) * | 2022-09-29 | 2023-01-31 | 攀钢集团西昌钢钒有限公司 | Novel smelting reduction iron-making method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848682A (en) * | 2015-05-11 | 2015-08-19 | 中国恩菲工程技术有限公司 | Smelting furnace of molten bath |
| CN105296699A (en) * | 2015-10-29 | 2016-02-03 | 东北大学 | Smelting reduction iron-making device and method for avoiding re-oxidation of pre-reduction ores |
| CN105698529A (en) * | 2015-10-27 | 2016-06-22 | 中国恩菲工程技术有限公司 | Improved type side-blowing molten pool smelting furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848682A (en) * | 2015-05-11 | 2015-08-19 | 中国恩菲工程技术有限公司 | Smelting furnace of molten bath |
| CN105698529A (en) * | 2015-10-27 | 2016-06-22 | 中国恩菲工程技术有限公司 | Improved type side-blowing molten pool smelting furnace |
| CN105296699A (en) * | 2015-10-29 | 2016-02-03 | 东北大学 | Smelting reduction iron-making device and method for avoiding re-oxidation of pre-reduction ores |
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Effective date of registration: 20211230 Address after: Room 528, No. 67, Fucheng Road, Haidian District, Beijing 100142 Patentee after: Beijing Hengyi Zhengxing Investment Co.,Ltd. Address before: Room 1401, 14 / F, block B, Tiangong building, No.30 Xueyuan Road, Haidian District, Beijing 100083 Patentee before: BEIJING SHANTIE TECHNOLOGY Co.,Ltd. |