CN114959152A - Method for producing reduced iron by two-section type electric heating and shaft furnace device - Google Patents
Method for producing reduced iron by two-section type electric heating and shaft furnace device Download PDFInfo
- Publication number
- CN114959152A CN114959152A CN202210541026.1A CN202210541026A CN114959152A CN 114959152 A CN114959152 A CN 114959152A CN 202210541026 A CN202210541026 A CN 202210541026A CN 114959152 A CN114959152 A CN 114959152A
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- China
- Prior art keywords
- electric heating
- reduction
- ores
- shaft furnace
- reduction section
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- 238000005485 electric heating Methods 0.000 title claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 3
- 230000006698 induction Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 238000001465 metallisation Methods 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims 1
- 229910010271 silicon carbide Inorganic materials 0.000 claims 1
- 238000006722 reduction reaction Methods 0.000 description 37
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a method for producing reduced iron by two-section type electric heating and a shaft furnace device, belonging to the field of gas-based direct reduced iron, comprising the following steps: the reduction zone of the shaft furnace is provided with two electric heating reduction sections with different heating and heat transfer modes, namely a pre-reduction section and a reduction section; the invention can effectively reduce the consumption of reducing gas in the production of direct reduced iron, can effectively improve the heat efficiency and has obvious energy-saving and emission-reducing effects.
Description
Technical Field
The invention relates to the field of shaft furnace gas-based direct reduced iron, in particular to a method for reducing the consumption of reducing gas and improving the energy efficiency and a shaft furnace device.
Background
The shaft furnace gas-based direct reduced iron technology is a non-blast furnace iron making process, has the advantages of no use of coking coal, low energy consumption, less carbon emission, environmental friendliness and the like, and plays an important role in energy conservation and emission reduction and improvement of the quality of steel products.
In the prior art, in other methods such as the HYL method and the Midrex method, reducing gas such as methane or coke oven gas is heated to a certain temperature and then is introduced into a shaft furnace, ores in the shaft furnace are heated to the temperature required by the reaction by the hot reducing gas for reaction, and heat required for maintaining the reaction is provided for a reaction system. This allows the amount of reducing gas used to heat the ore to carry heat to be much greater than the amount of reducing gas that participates in the reduction reaction; although various top gas recovery devices are arranged in various existing processes, the top gas cannot be completely recovered, and the utilization rate of the top gas is only about 38% at present, so that the cost is increased, the emission of reducing gas is increased, and the potential safety hazard is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for producing reduced iron by two-section type electric heating, which comprises the following steps: heating ore by two electric heating sections with different heating and heat transfer modes and carrying out reduction reaction, wherein an electric heating element is arranged in a pre-reduction section, and the generated heat is transferred to the ore entering from the top of the furnace by the heat transfer modes of radiation, conduction and convection; the reduction section is provided with an induction heating device, so that the pre-reduced ore with a certain metallization rate can generate heat by self through electromagnetic induction in the reduction section to generate a higher and more uniform temperature than the pre-reduction section, and can quickly and deeply react with the reduction gas to achieve a higher metallization rate.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides a shaft furnace device for producing reduced iron by two-section type electric heating, which comprises: in the reduction zone of the shaft furnace, there are two electrical heating sections, namely a pre-reduction section and a reduction section. An electric heating element is arranged in a pre-reduction section of the shaft furnace, the generated heat heats ores entering from the top of the furnace in a radiation, conduction and convection heat transfer mode, and the hot ores in the pre-reduction section react with a reducing gas to generate a metallization rate of 10% -50%; the reduction section below the pre-reduction section of the shaft furnace is provided with an induction heating device, so that the ores which are pre-reduced and have the metallization rate of 10% -50% generate heat by self through electromagnetic induction in the reduction section to generate higher and more uniform temperature than the pre-reduction section, and can quickly and deeply react with the reduction gas to achieve the metallization rate of more than 85%.
Further, the method also comprises the following steps: the electric heating element can be a heating element indirectly heated by resistance such as an electric heating wire, a silicon carbon rod, a silicon molybdenum rod and the like or an induction heating device provided with a metal core.
Further, the method also comprises the following steps: the induction heating device may be an induction heating device using a power frequency, a medium frequency or a high frequency alternating current.
Further, the method also comprises the following steps: the ore is lump ore, pellet ore and a mixture thereof.
The beneficial effects of the invention at least comprise:
1) the electric heating device is used for providing the required heat for the reduction reaction in the shaft furnace, and the part of reducing gas for carrying the heat is saved, so that the consumption of the reducing gas in the direct reduction iron process of the shaft furnace is greatly reduced, and the cost and the emission are reduced;
2) the two-section type electric heating greatly improves the heat efficiency of the shaft furnace, and the energy-saving effect is obvious;
3) because the reduction section adopts induction heating, the ore can be uniformly heated to a higher temperature than that of the pre-reduction section, so that the reduction reaction speed is increased, and the equipment efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to specific examples. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Example 1: a plurality of steel pipes which are penetrated with electric heating wires or electric heating belts are transversely and tightly attached to the furnace wall of a pre-reduction section at the upper half part of a reduction zone in the shaft furnace, wherein the electric heating wires or the electric heating belts are separated from the steel pipes by high-temperature-resistant insulating materials (such as mica sheets and the like), the steel pipes are spaced at a certain distance, the temperature of the pre-reduction section can be increased after the steel pipes are electrified, and the generated heat raises the temperature of ores in a radiation, conduction and convection mode so as to react with introduced reduction gas to generate the metallization rate of 10-50%; a red copper induction coil is arranged on the reduction section of the lower half part of the reduction area and clings to the furnace wall, the surface of the induction coil is covered by a furnace lining material, and after the induction coil is electrified, part of metallized ore in the reduction area can generate heat in an induction mode.
Example 2: a circle of steel plate is arranged on a pre-reduction section at the upper half part of a reduction zone in the shaft furnace, an induction coil of red copper is arranged between the steel plate and the furnace wall, the steel plate heats after being electrified to enable the temperature of the pre-reduction section to rise, and the generated heat enables the temperature of ores to rise through radiation, conduction and convection so as to react with introduced reduction gas to generate the metallization rate of 10% -50%; and a red copper induction coil is tightly attached to the furnace wall of the reduction section at the lower half part of the reduction zone, the surface of the induction coil is covered by a furnace lining material of the intermediate frequency furnace, and after the induction coil is electrified, partial metallized ore in the reduction zone can be induced to heat.
Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A two-section type electric heating method for producing reduced iron is characterized in that: firstly, an electric heating element mode is used for heating, the ores are heated through a radiation, conduction and convection heat transfer mode, and the ores are reacted with a reducing gas, so that part of iron ores in the ores can be converted into metallic iron to obtain the metallization rate of 10% -50%; this partially metallised ore is then inductively heated to a high temperature above 1000 ℃ and reacted further with a reducing gas to give a metallisation of above 85%.
2. The shaft furnace installation designed according to the method of claim 1, characterized in that: the reduction area of the shaft furnace is divided into two sections with different heating and heat transfer modes, namely: the device comprises a pre-reduction section and a reduction section, wherein the pre-reduction section heats ores in an electric heating element mode and in a radiation, conduction and convection heat transfer mode, and the reduction section directly heats the ores which are pre-reduced and have the metallization ratio of 10% -50% in an induction heating mode.
3. According to claim 1, the electric heating element comprises a heating wire, a ribbon heater, a silicon carbide rod, a silicon molybdenum rod, or the like which generates heat energy by joule effect of current flowing through a conductor, and an induction coil provided with a metal core.
4. The induction heating according to claim 1 may be induction heating using mains, medium or high frequency alternating current.
5. The ore of claim 1, comprising lump ore and pellet ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210541026.1A CN114959152A (en) | 2022-05-18 | 2022-05-18 | Method for producing reduced iron by two-section type electric heating and shaft furnace device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210541026.1A CN114959152A (en) | 2022-05-18 | 2022-05-18 | Method for producing reduced iron by two-section type electric heating and shaft furnace device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114959152A true CN114959152A (en) | 2022-08-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210541026.1A Pending CN114959152A (en) | 2022-05-18 | 2022-05-18 | Method for producing reduced iron by two-section type electric heating and shaft furnace device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114959152A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115612774A (en) * | 2022-10-12 | 2023-01-17 | 中南大学 | Novel method for making iron by directly reducing hydrogen-based shaft furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2590029C1 (en) * | 2015-01-12 | 2016-07-10 | Общество с ограниченной ответственностью "Научно-производственное внедренческое предприятие ТОРЭКС" | Method for production of sponge iron and shaft furnace therefor |
| CN110512043A (en) * | 2019-09-11 | 2019-11-29 | 中南大学 | A kind of method of gas-based shaft kiln calcined limestone coproduction iron ore prereduction product |
| CN111854418A (en) * | 2020-08-24 | 2020-10-30 | 马鞍山中科冶金材料科技有限公司 | Resistance type heating shaft furnace |
| CN112899427A (en) * | 2021-01-15 | 2021-06-04 | 东北大学 | Hydrogen shaft furnace iron making system and method using electric energy for heating |
| CN114134277A (en) * | 2021-12-22 | 2022-03-04 | 张伟 | Electric auxiliary heating direct reduction shaft furnace |
-
2022
- 2022-05-18 CN CN202210541026.1A patent/CN114959152A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2590029C1 (en) * | 2015-01-12 | 2016-07-10 | Общество с ограниченной ответственностью "Научно-производственное внедренческое предприятие ТОРЭКС" | Method for production of sponge iron and shaft furnace therefor |
| CN110512043A (en) * | 2019-09-11 | 2019-11-29 | 中南大学 | A kind of method of gas-based shaft kiln calcined limestone coproduction iron ore prereduction product |
| CN111854418A (en) * | 2020-08-24 | 2020-10-30 | 马鞍山中科冶金材料科技有限公司 | Resistance type heating shaft furnace |
| CN112899427A (en) * | 2021-01-15 | 2021-06-04 | 东北大学 | Hydrogen shaft furnace iron making system and method using electric energy for heating |
| CN114134277A (en) * | 2021-12-22 | 2022-03-04 | 张伟 | Electric auxiliary heating direct reduction shaft furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115612774A (en) * | 2022-10-12 | 2023-01-17 | 中南大学 | Novel method for making iron by directly reducing hydrogen-based shaft furnace |
| CN115612774B (en) * | 2022-10-12 | 2024-04-30 | 中南大学 | New method for directly reducing iron-making by hydrogen-based shaft furnace |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Wei Inventor after: Liu Xiaohui Inventor before: Zhang Wei |
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| CB03 | Change of inventor or designer information |