CN110578029B - Two-section type descending entrained flow iron-making system and iron-making process - Google Patents
Two-section type descending entrained flow iron-making system and iron-making process Download PDFInfo
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- CN110578029B CN110578029B CN201910911189.2A CN201910911189A CN110578029B CN 110578029 B CN110578029 B CN 110578029B CN 201910911189 A CN201910911189 A CN 201910911189A CN 110578029 B CN110578029 B CN 110578029B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
Abstract
The invention discloses a two-section type descending entrained flow iron-making system and an iron-making process, which comprise the following steps: the melting furnace section is vertically arranged downwards, the top of the melting furnace section is provided with a basic combustion/gasification device, a first inlet and a second inlet are arranged below the basic combustion/gasification device, the first inlet and the second inlet are uniformly arranged along the side wall of the melting furnace section, a tangent circle is formed in the melting furnace section, and the second inlet is positioned below the first inlet; the first inlet is connected with a coke/pulverized coal source, an air source and a water vapor source; the bottom of the melting furnace section is provided with a slag pool, the slag pool is provided with a slag discharging device and a tapping device, and the downstream of the slag pool is an outlet end; the pre-reduction furnace section is vertically arranged downwards, the top of the pre-reduction furnace section is connected with the outlet end of the melting furnace section, a third inlet and a fourth inlet are arranged above the pre-reduction furnace section, the bottom of the pre-reduction furnace section is an outlet, the third inlet is connected with a temperature-regulating and tempering medium source, and the fourth inlet is connected with an iron ore powder source; and the inlet of the first separator is connected with the outlet of the pre-reduction furnace section, and the outlet at the bottom of the first separator is connected with the second inlet through a conveying pipeline.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and particularly relates to a two-section type descending entrained flow iron-making process.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Blast furnace ironmaking is currently the predominant method of producing steel and its dominance is expected to be unchanged for a short period of time. The method is a continuous metallurgical method for reducing iron ore into iron in a blast furnace, and the smelting process comprises the following steps: iron ore, coke and a flux for slag formation are charged from the furnace top in a predetermined ratio, the furnace throat charge level is maintained at a predetermined height, the coke and the ore form an alternate layered structure in the furnace, the coke is burned with oxygen in hot air blown in to produce carbon monoxide and hydrogen, oxygen in the iron ore is removed in the course of rising in the furnace, iron is reduced to obtain iron, and the iron becomes liquid at a high temperature of 2000 ℃ or higher. The liquid molten iron thus produced flows out from the tap hole and is solidified to form a pig iron, and impurities in the iron ore are combined with the flux to form slag, which is discharged from the tap hole.
Therefore, a large amount of high-quality coke is required to be used in the blast furnace ironmaking method, however, coking coal resources are increasingly poor, the price of metallurgical coke is higher and higher, but cheap non-coking coal resources with abundant reserves cannot be fully utilized in ironmaking production. In order to change the dependence of iron-making on coke resources, researchers explore different forms of non-blast furnace iron-making methods, and initially form a modern non-blast furnace iron-making industrial system mainly based on direct reduction and smelting reduction. The existing non-blast furnace ironmaking technology comprises a direct reduction method of gas reduction, a direct reduction method of applying a solid reducing agent, and typical smelting reduction processes such as a Corex process, a Finex process, a HIsmelt process and the like, but the processes have different problems, such as low reduction efficiency, low waste heat recovery rate, partial metallurgical coke and the like, and an ironmaking process with simple process and low energy consumption is not realized.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a two-section type downdraft entrained flow iron making system and an iron making process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a two-stage downdraft entrained flow ironmaking system comprising:
the melting furnace section is vertically arranged downwards, a basic combustion/gasification device is arranged at the top of the melting furnace section, a first inlet and a second inlet are arranged below the basic combustion/gasification device, the first inlet and the second inlet are uniformly arranged along the side wall of the melting furnace section, a tangent circle is formed in the melting furnace section, and the second inlet is positioned below the first inlet; the first inlet is connected with a coke/pulverized coal source, an air source and a water vapor source;
the bottom of the melting furnace section is provided with a slag pool, the slag pool is provided with a slag discharging device and a tapping device, and the downstream of the slag pool is an outlet end;
the pre-reduction furnace section is vertically arranged downwards, the top of the pre-reduction furnace section is connected with the outlet end of the melting furnace section, a third inlet and a fourth inlet are arranged above the pre-reduction furnace section, the bottom of the pre-reduction furnace section is an outlet, the third inlet is connected with a temperature-regulating and tempering medium source, and the fourth inlet is connected with an iron ore powder source;
and the inlet of the first separator is connected with the outlet of the pre-reduction furnace section, and the outlet at the bottom of the first separator is connected with the second inlet through a conveying pipeline.
Under the carrying action of air and steam, coke powder/coal powder enters the melting furnace section along the side wall of the melting furnace section, a rotational flow is formed in the melting furnace section and rotates to move downwards, a burner sprays flame to the rotational flow, the coal powder/coke powder is ignited or gasified to generate high-temperature flame, the high-temperature flame flows through the entering pre-reduced mineral powder fluid under the carrying action of the rotational flow, and the two fluids with different movement speeds meet and collide, so that the two fluids are quickly and uniformly mixed.
Because the fluid moves downwards spirally, the contact time of the pre-reduced iron ore powder with high-temperature reducing gas is prolonged, the reduction degree of the iron ore powder can be effectively improved, and the iron-making yield is improved. And the fluid moves downwards spirally, so that the fluid has a good carrying effect on the iron ore powder, can effectively prevent the iron ore powder from settling in the melting furnace section, enables the iron ore powder and the air flow to be uniformly mixed, and is favorable for improving the iron-making rate of the iron ore powder.
The iron oxides in the iron ore powder are reduced to produce molten iron, and the molten iron and slag fall into a slag pool and are discharged through a tapping device and a slag discharging device.
And the gas flow flowing out of the melting furnace section is cooled to a proper temperature through the temperature-adjusting tempering medium entering from the third inlet, then enters the pre-reduction furnace section, is in fluid contact with the entering iron ore powder to pre-reduce the iron ore powder, after the pre-reduction is finished, iron oxides in the iron ore powder mainly generate FeO, and part of the FeO is directly reduced into Fe, the FeO is separated by a separator, and the pre-reduced iron ore powder is conveyed to the melting furnace section for high-temperature reduction.
In some embodiments, the bottom of the melting furnace section is provided with a funnel structure, and the outlet end of the funnel structure is provided with the slag bath. Molten iron produced in the melting furnace section is collected at the funnel structure part and flows into the slag pool through the funnel structure. So as to ensure the smooth outflow of the molten iron.
In some embodiments, the first inlet comprises 2-8 inlets arranged circumferentially of the melter section.
In some embodiments, the second inlets comprise 2-8 inlets arranged circumferentially of the melter section.
In some embodiments, the pre-reduction furnace section and the melting furnace section are connected by an arcuate conduit. The arc-shaped pipeline can gently change the flow direction of the reducing gas and has small influence on the internal flow field of the gas flow. Through the arc-shaped pipeline, when the airflow flowing out of the melting furnace section flows through the pre-reduction furnace section, the good turbulence and carrying effects on the iron ore powder added into the pre-reduction furnace section can be achieved, and the pre-reduction effect on the iron ore powder is improved.
In some embodiments, the system further comprises a second separator, wherein an inlet of the second separator is connected with a gas outlet of the first separator through a pipeline, a fifth inlet is arranged on the pipeline, and the fifth inlet is connected with a cold iron ore powder source.
And the higher-temperature airflow separated from the first separator flows through the fifth inlet and contacts with the cold iron ore powder fed from the fifth inlet to heat the cold iron ore powder, and the cold iron ore powder is carried to the second separator for gas-solid separation in the second separator. The cold iron ore powder is preheated, which is more beneficial to the reduction ironmaking of the subsequent iron ore powder.
Further, a solid outlet of the second separator is connected with the fourth inlet through a conveying pipeline, and a gas outlet of the second separator is connected with the first heat exchanger through a pipeline.
Because the temperature of the gas is higher after the chilling iron ore powder is preheated, the waste heat can be recovered at the position of the first heat exchanger, and the waste of heat is prevented.
In some embodiments, the coal powder coking furnace further comprises a coal powder coking furnace section and a third separator, wherein the coal powder coking furnace section is vertically arranged, the bottom of the coal powder coking furnace section is connected with the gas outlet of the first separator, the lower end of the coal powder coking furnace section is provided with a sixth inlet, the sixth inlet is connected with a coal powder source, and the top of the sixth inlet is connected with the inlet of the third separator.
The hot air flow separated from the first separator can be used for heating and coking the coal powder.
Further, a solids outlet end of the third separator is connected to the first inlet. The separated coke powder is conveyed to a melting furnace section to participate in reaction.
Further, the gas outlet end of the third separator is connected with the second heat exchanger through a pipeline.
And the second heat exchanger is used for recovering waste heat of the hot air flow separated from the third separator, so that waste of heat is prevented.
A two-section type descending entrained flow iron-making process comprises the following steps:
under the carrying action of air and water vapor, the coke powder/coal powder enters the melting furnace section from the side wall of the melting furnace section to form rotational flow in the melting furnace section;
the basic burner/gasifier at the top of the melter section injects a flame inwards to ignite or gasify the fluid and produce a reducing gas;
spraying the pre-reduced iron ore powder into the melting furnace section, and fully mixing the iron ore powder with the coke powder/coal powder airflow;
under the high-temperature reduction action, reducing iron oxides in the iron ore powder into iron simple substances, and melting the iron simple substances into molten iron at high temperature;
the reacted reducing high-temperature gas flows into the pre-reduction furnace section from the melting furnace section, and pre-reduction is carried out on the iron ore powder sprayed into the pre-reduction furnace section; conveying the pre-reduced iron ore powder to a melting furnace section.
In some embodiments, the method further comprises the step of preheating the chill ore fines with a high temperature gas stream flowing from the pre-reduction furnace section.
In some embodiments, the method further comprises the step of coking the coal fines with a high temperature gas stream flowing from the pre-reduction furnace section.
In some embodiments, the temperature of the melting furnace section reaction is 1300-1700 ℃.
In some embodiments, the temperature of the pre-reduction furnace section is 700 to 1100 ℃.
In some embodiments, the circulating coal gas or the mixture of the coal powder and the circulating coal gas is added to the pre-reduction furnace section as a cooling temperature regulating medium, and the proportion of the reducing gas in the conditioned gas is increased.
The pre-reduction furnace section of the ore powder is cooperated with coking/gasification of the coal powder, the coal powder/steam gasification medium or the circulating coal gas is cooperated with the coal powder/steam to simultaneously adjust the temperature and gasify, the temperature is reduced and the coal powder gasification/coking is simultaneously carried out, so that coal gas conditioning is realized, and a more appropriate reduction condition is provided for the pre-reduction of the ore powder at the lower part. In this case, the coke powder is separated simultaneously with the ore powder and fed together into the melting furnace.
The invention has the beneficial effects that:
the invention provides a two-section type downdraft entrained flow iron-making process, which is applied to a melting furnace section and an ore powder pre-reduction furnace section, wherein the temperature distribution in a reactor of the two-section furnace is controlled according to the required condition for reducing iron ore powder into molten iron, the melting furnace section generates high-temperature melting reduction reaction to generate molten iron mainly from FeO, the ore powder pre-reduction furnace section generates pre-reduction reaction to generate FeO or partial Fe mainly from the iron ore powder. The process realizes pre-reduction and smelting reduction of the mineral powder, realizes two reactions in the airflow descending bed, is beneficial to keeping uniform suspension state of mineral powder particles, and is beneficial to improving the reduction efficiency. The process of converting iron ore into molten iron is completed in the same device, the complexity of the system is reduced, and the occupied area is reduced.
Two temperature adjusting modes are provided for cooling and adjusting the temperature of the coal gas at the inlet of the pre-reduction section, and the coal gas at the outlet of the melting furnace section is cooled by circulating coal gas through a cooling medium and then enters the ore powder pre-reduction furnace section. The coal powder or the coal powder and the circulating coal gas are simultaneously used as cooling and temperature regulating media, the ore powder pre-reduction furnace section is cooperated with coal powder coking/gasification, the coal powder/steam gasification media or the circulating coal gas is cooperated with coal powder/steam to simultaneously regulate temperature and gasify, and the temperature reduction and the coal powder gasification/coking are simultaneously carried out, so that a more proper reduction condition is provided for the pre-reduction of the lower ore powder. In this case, the coke powder is separated simultaneously with the ore powder and fed together into the melting furnace.
Two arrangement modes are provided for the pre-reduced coal gas, one is provided with a preheating cyclone separator for mineral powder for heat exchange, the temperature of the mineral powder is increased, and the pre-reduction degree is favorably improved; the other method is provided with the coking of the coal powder, can expand the application range of coal types, and is particularly suitable for lignite or bituminous coal with high moisture content. Can realize short-process smelting of steel and has wide application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural view of a two-stage downdraft entrained flow ironmaking system according to a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a two-stage downdraft entrained flow ironmaking system according to a second embodiment of the present invention;
wherein: 1. a base combustor/gasifier; 2. a first inlet; 3. a second inlet; 4. a melting furnace section; 5. a slag pool; 6. a third inlet; 7. a fourth inlet; 8. a pre-reduction furnace section; 9. a first separator; 10. a fifth inlet; 11. a second separator; 12. a first heat exchanger; 13. a gas outlet pipe; 14. a sixth inlet; 15. a pulverized coal coking furnace section; 16. a third separator; 17. a second heat exchanger.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1:
as shown in fig. 1, a two-stage descending entrained flow ironmaking process apparatus (arrangement mode 1) structure comprises a melting furnace section 4, the melting furnace section 4 is an air flow descending bed, a basic burner/gasifier 1 is arranged at the top, a first inlet 2 for coke (coal) powder (air, water vapor) is arranged at the upper side, and a pre-reduction ore powder inlet-second inlet 3 is arranged at a distance below the first inlet 2; the ore powder pre-reduction furnace section 8 is an airflow descending bed, the upper side surface is a preheated ore powder inlet-a fourth inlet 7, and the lower part is connected with an inlet of a pre-reduction ore powder separator-a first separator 9; the melting furnace section 4 and the fine ore pre-reduction furnace section 8 are connected through a slag pool 5; a cooling temperature-regulating tempering medium inlet-a third inlet 6 is arranged at the connecting pipeline of the slag pool 5 and the ore powder pre-reduction furnace section 8; an upper outlet of the first separator 9 is connected with an inlet of the preheating cyclone separator-second separator 11, and a lower outlet is connected with an inlet of the pre-reduced ore powder-second inlet 3; a cold mineral powder inlet-a fifth inlet 10 is arranged at an outlet above the pre-reduction mineral powder separator-the first separator 9; the lower outlet of the preheating cyclone separator-second separator 11 is connected with a preheating mineral powder inlet-fourth inlet 7, and the upper outlet is sequentially connected with a coal gas heat exchanger-first heat exchanger 12 and a coal gas outlet pipe 13.
The method for the iron making process by the two-section type descending entrained flow bed (arrangement mode 1) comprises the following specific steps:
1) high temperature smelting reduction
The basic combustion/gasifier combusts/gasifies the fed coke (coal) powder (air and water vapor) to generate high temperature and reducing atmosphere of about 1600 ℃, the pre-reduced iron ore powder mainly generates the reaction of FeO to generate molten iron in the smelting reduction furnace, and the molten iron falls into a slag pool. The coke (coal) powder (air, water vapor) and the pre-reduced ore powder are sprayed in a mode of four-corner tangential circle or hexagonal tangential circle, which is beneficial to uniform mixing.
2) Pre-reduction of ore fines
High-temperature coal gas generated in the melting furnace section enters the mineral powder pre-reduction furnace section after being cooled and tempered by a cooling/tempering medium, preheated mineral powder is fed from the upper part of the furnace section, and the coal gas and the preheated mineral powder mainly carry out pre-reduction reaction for generating FeO and part of Fe by the mineral powder. The cooling/tempering medium is circulating coal gas or circulating coal gas and coal powder. The two sections are airflow descending beds, so that the mineral powder particles can be kept in a uniform suspension state, and the reduction efficiency is improved.
3) Separation of pre-reduced ore fines
The coal gas and the pre-reduced ore powder enter an inlet of a pre-reduced ore powder separator, the pre-reduced ore powder is separated from the lower part of the separator and enters a melting furnace section through the pre-reduced ore powder inlet; the gas is separated from the upper part of the separator.
4) Preheating of cold ore powder
The coal gas discharged from the upper part of the pre-reduction ore powder separator carries cold ore powder to enter the inlet of the pre-heating cyclone separator, the coal gas and the cold ore powder carry out heat exchange, the temperature of the cold ore powder is increased, and the pre-reduction degree is favorably improved. Separating preheated ore powder from the lower part of the separator, and feeding the ore powder into an ore powder pre-reduction furnace section; the coal gas is discharged from the upper part of the separator, passes through the coal gas heat exchanger and then is discharged from the coal gas outlet pipe.
Example 2:
another embodiment of the present application is shown in fig. 2. The structure of a two-section descending entrained flow iron-making process device (arrangement mode 2) comprises a melting furnace section 4, wherein the melting furnace section 4 is an air flow descending bed, the top of the melting furnace section is provided with a basic burner/gasifier 1, the upper side surface of the melting furnace section is provided with a coke powder (air and water vapor) inlet-a first inlet 2, and the lower side of the melting furnace section is provided with a pre-reduction ore powder inlet-a second inlet 3 at a distance; the ore powder pre-reduction furnace section 8 is an airflow descending bed, the upper side surface is provided with an ore powder inlet-a fourth inlet 7, and the lower part is connected with an inlet of a pre-reduction ore powder separator-a first separator 9; the melting furnace section 4 and the fine ore pre-reduction furnace section 8 are connected through a slag pool 5; a cooling temperature-regulating tempering medium inlet-a third inlet 6 is arranged at the connecting pipeline of the slag pool 5 and the ore powder pre-reduction furnace section 8; the upper outlet of the pre-reduction ore powder separator-first separator 9 is connected with the pulverized coal coking furnace section 15, and the lower outlet is connected with the pre-reduction ore powder inlet-second inlet 3; a coal powder inlet-a sixth inlet 14 is arranged below the coal powder coking furnace section 15, and an inlet of a coke powder separator-a third separator 16 is connected above the coal powder coking furnace section; the lower outlet of the coke powder separator-third separator 16 is connected with a coke powder (air and water vapor) inlet-first inlet 2, and the upper outlet is sequentially connected with a coal gas outlet pipe 13 and a second heat exchanger 17.
The application discloses another two-section type descending entrained flow bed (arrangement mode 2) iron making process method, which comprises the following specific steps:
1) high temperature smelting reduction
The basic combustion/gasification device combusts/gasifies the fed coke powder (air and water vapor) to generate high temperature and reducing atmosphere of about 1600 ℃, the pre-reduced iron ore powder mainly generates the reaction of FeO to generate molten iron in the melting reduction furnace, and the molten iron falls into a slag pool. The coke powder (air and water vapor) and the pre-reduced ore powder are sprayed in a mode of cutting circles at four corners or cutting circles at six corners, so that uniform mixing is facilitated.
2) Pre-reduction of ore fines
High-temperature coal gas generated in the melting furnace section is cooled and tempered by a cooling/tempering medium and then enters the mineral powder pre-reduction furnace section, mineral powder is fed from the upper part of the furnace section, and the coal gas and the mineral powder mainly carry out pre-reduction reaction for generating FeO and part of Fe by the mineral powder. The two sections are airflow descending beds, so that the mineral powder particles can be kept in a uniform suspension state, and the reduction efficiency is improved.
3) Separation of pre-reduced ore fines
The coal gas and the pre-reduced ore powder enter an inlet of a pre-reduced ore powder separator, the pre-reduced ore powder is separated from the lower part of the separator and enters a melting furnace section through the pre-reduced ore powder inlet; the gas is separated from the upper part of the separator.
4) Coal dust coking
Coal gas discharged from the upper part of the pre-reduction ore powder separator carries coal powder to enter a coal powder coking furnace section, the coal powder is prepared into coke powder under the temperature and atmosphere provided by the coal gas, and pyrolysis gas and the coke powder go upwards to enter a coke powder separator. The coal type adaptability can be enlarged by setting the coking of the coal powder, and the method is particularly suitable for lignite or high-moisture bituminous coal. Separating the coke powder from the lower part of the separator and feeding the coke powder into a melting furnace section; the coal gas is discharged from the upper part of the separator, flows through a coal gas outlet pipe and then enters the coal gas heat exchanger.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A two-section descending entrained flow iron-making system is characterized in that: the method comprises the following steps:
the melting furnace section is vertically arranged downwards, a basic combustion/gasification device is arranged at the top of the melting furnace section, a first inlet and a second inlet are arranged below the basic combustion/gasification device, the first inlet and the second inlet are uniformly arranged along the side wall of the melting furnace section, a tangent circle is formed in the melting furnace section, and the second inlet is positioned below the first inlet; the first inlet is connected with a coke/pulverized coal source, an air source and a water vapor source;
the bottom of the melting furnace section is provided with a slag pool, the slag pool is provided with a slag discharging device and a tapping device, and the downstream of the slag pool is an outlet end;
the pre-reduction furnace section is vertically arranged downwards, the top of the pre-reduction furnace section is connected with the outlet end of the melting furnace section, a third inlet and a fourth inlet are arranged above the pre-reduction furnace section, the bottom of the pre-reduction furnace section is an outlet, the third inlet is connected with a temperature-regulating and tempering medium source, and the fourth inlet is connected with an iron ore powder source;
and the inlet of the first separator is connected with the outlet of the pre-reduction furnace section, and the outlet at the bottom of the first separator is connected with the second inlet through a conveying pipeline.
2. The two stage downdraft entrained flow ironmaking system of claim 1, wherein: the bottom of the melting furnace section is provided with a funnel structure, and the outlet end of the funnel structure is provided with the slag pool.
3. The two stage downdraft entrained flow ironmaking system of claim 1, wherein: the first inlets comprise 2-8 inlets and are arranged along the circumferential direction of the smelting furnace section;
or, the second inlet comprises 2-8 inlets arranged along the circumference of the melting furnace section.
4. The two stage downdraft entrained flow ironmaking system of claim 1, wherein: the pre-reduction furnace section and the melting furnace section are connected through an arc-shaped pipeline.
5. The two stage downdraft entrained flow ironmaking system of claim 1, wherein: the device also comprises a second separator, wherein an inlet of the second separator is connected with a gas outlet of the first separator through a pipeline, a fifth inlet is formed in the pipeline, and the fifth inlet is connected with a cold iron ore powder source.
6. The two stage downdraft entrained flow ironmaking system of claim 5, wherein: and a solid outlet of the second separator is connected with the fourth inlet through a conveying pipeline, and a gas outlet of the second separator is connected with the first heat exchanger through a pipeline.
7. The two stage downdraft entrained flow ironmaking system of claim 1, wherein: the coal powder coking furnace is vertically arranged, the bottom of the coal powder coking furnace is connected with a gas outlet of the first separator, the lower end of the coal powder coking furnace is provided with a sixth inlet, the sixth inlet is connected with a coal powder source, and the top of the sixth inlet is connected with an inlet of the third separator.
8. The two stage downdraft entrained flow ironmaking system of claim 7, wherein: the solids outlet end of the third separator is connected to the first inlet.
9. The two stage downdraft entrained flow ironmaking system of claim 7, wherein: and the gas outlet end of the third separator is connected with the second heat exchanger through a pipeline.
10. A process according to any one of claims 1 to 9 in a two stage downdraft entrained flow ironmaking system, wherein: the method comprises the following steps:
under the carrying action of air and water vapor, the coke powder/coal powder enters the melting furnace section from the side wall of the melting furnace section to form rotational flow in the melting furnace section;
the basic burner/gasifier at the top of the melter section injects a flame inwards to ignite or gasify the fluid and produce a reducing gas;
spraying the pre-reduced iron ore powder into the melting furnace section, and fully mixing the iron ore powder with the coke powder/coal powder airflow;
under the high-temperature reduction action, reducing iron oxides in the iron ore powder into iron simple substances, and melting the iron simple substances into molten iron at high temperature;
the reacted reducing high-temperature gas flows into the pre-reduction furnace section from the melting furnace section, and pre-reduction is carried out on the iron ore powder sprayed into the pre-reduction furnace section; conveying the pre-reduced iron ore powder to a melting furnace section.
11. The process of a two-stage downdraft entrained flow ironmaking system of claim 10, wherein: the method also comprises the step of preheating the cold iron ore powder by high-temperature airflow flowing out of the pre-reduction furnace section;
or the method also comprises the step of coking the coal dust by the high-temperature airflow flowing out of the pre-reduction furnace section.
12. The process of a two-stage downdraft entrained flow ironmaking system of claim 10, wherein: the temperature of the melting furnace section reaction is 1300-1700 ℃;
or the temperature of the pre-reduction furnace section is 700-1100 ℃.
13. The process of a two-stage downdraft entrained flow ironmaking system of claim 10, wherein: and adding the circulating coal gas or the mixture of the coal powder and the circulating coal gas as a cooling temperature-regulating medium to the pre-reduction furnace section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911189.2A CN110578029B (en) | 2019-09-25 | 2019-09-25 | Two-section type descending entrained flow iron-making system and iron-making process |
| PCT/CN2019/129539 WO2021056905A1 (en) | 2019-09-25 | 2019-12-28 | Two-section downdraught bed ironmaking system and ironmaking process |
| US17/295,965 US20220213567A1 (en) | 2019-09-25 | 2019-12-28 | Ironmaking system and ironmaking process of two-section downdraft bed |
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| CN201910911189.2A CN110578029B (en) | 2019-09-25 | 2019-09-25 | Two-section type descending entrained flow iron-making system and iron-making process |
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| CN110578029B true CN110578029B (en) | 2020-11-10 |
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| CN110578029B (en) * | 2019-09-25 | 2020-11-10 | 山东大学 | Two-section type descending entrained flow iron-making system and iron-making process |
| CN114574651B (en) * | 2022-01-24 | 2023-05-05 | 山东大学 | Cyclone iron wall melting smelting device and method |
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| WO2021056905A1 (en) | 2021-04-01 |
| CN110578029A (en) | 2019-12-17 |
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