CN107904347B - Coal-based direct reduction shaft furnace and reduction method thereof - Google Patents
Coal-based direct reduction shaft furnace and reduction method thereof Download PDFInfo
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- CN107904347B CN107904347B CN201711234876.2A CN201711234876A CN107904347B CN 107904347 B CN107904347 B CN 107904347B CN 201711234876 A CN201711234876 A CN 201711234876A CN 107904347 B CN107904347 B CN 107904347B
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft 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
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
Abstract
The invention provides a coal-based direct reduction shaft furnace, which comprises a furnace body, wherein a preheating section is arranged above the outside of the furnace body, a material distribution mechanism, a combustion chamber and a cooling section are sequentially arranged in the furnace body from top to bottom, a reduction section is arranged in the combustion chamber in a penetrating manner, the preheating section is coaxially arranged with the reduction section through the material distribution mechanism, a discharge hole of the material distribution mechanism is communicated with a feed hole of the reduction section, a discharge hole of the reduction section is communicated with a feed hole of the cooling section, a heat source introducing port is arranged at the lower part of the preheating section, a high-temperature waste gas outlet is arranged at the upper part of the combustion chamber, and the high-. This reduction shaft furnace sets up the preheating section in the outside of combustion chamber for the preheating section adopts ordinary heat preservation resistant material to build by laying bricks or stones can, maintains simply, is showing simultaneously and has reduced the interior high heat conduction resistant material heat conduction jar height of carborundum of combustion chamber, reduces the resistant material quantity of carborundum, has saved investment cost, and the combustion chamber height reduces, easily controls the homogeneity of reduction section temperature.
Description
Technical Field
The invention belongs to the technical field of direct reduction, and particularly relates to a coal-based direct reduction shaft furnace and a reduction method thereof.
Background
In a conventional method for producing direct reduced iron, in which iron ores or pellets containing iron oxide are directly reduced with a reducing gas to obtain reduced iron, as exemplified by the Midrex process, a reducing gas made of natural gas or the like is forcibly introduced into a shaft furnace from a tuyere provided at the bottom of the shaft furnace to reduce the iron oxide, thereby obtaining reduced iron.
In recent years, a new method for producing reduced iron, in which a carbonaceous material such as coal is used instead of natural gas, coal is used as a reducing agent, known as a rotary hearth furnace, a rotary kiln or the like, and calcined pellets made of iron ore are reduced by heating to obtain metallic iron, has been popular in areas lacking natural gas. However, in this type of process, a reducing atmosphere and an oxidizing atmosphere coexist in the furnace, and the reduced metallic iron is reoxidized, which makes it difficult to improve the product quality. In order to solve the problem, a flame-proof coal-based direct reduction technology is provided, wherein a reduction chamber and a combustion chamber are separately arranged, and heat enters the reduction chamber through conduction, so that a good reduction atmosphere is formed in the reduction chamber; for example, patent document CN101215614A discloses a multi-layer sealed partition and melting gasification combined metal smelting method for reduction chamber and heating chamber, according to the method, a reducing agent and metal oxides such as iron ore are mixed according to a certain proportion and then added into the reduction chamber of a direct reduction device, the metal oxides in the reduction chamber are reduced into sponge iron by the reducing agent at high temperature, and the direct reduction device uses a heat conduction sealed partition heating chamber or reduction chamber; for example, patent document CN2921740Y and patent document CN1818081A disclose an internal and external heating vertical channel reduction furnace and a method for producing sponge iron using the same, wherein the material is continuously operated from top to bottom in the reduction furnace, the reduction furnace is divided into a preheating zone and a heating and reducing reaction zone, a row of burners must be arranged in the preheating zone of the reduction furnace, 3-4 rows of burners must be arranged in the heating and reducing zone, 2-6 reaction tanks are horizontally and vertically arranged in the furnace, 4-100 rows of reaction tanks are vertically arranged, a group of burners are arranged between every two reaction tanks for heating the periphery of the reaction tanks, an internal burner is arranged at the bottom of each reaction tank, heat-insulating layers are arranged at the outlets of the lower parts of all the reaction tanks in the reduction furnace, iron ore powder containing iron oxide is mixed with binder to form balls, a layer of carbon powder is adhered to the outer layer of the iron balls, then the carbon powder is oxidized into double-layer iron oxide balls through high-temperature flue gas, and the double-layer iron oxide balls And preparing the sponge iron.
However, the production of direct reduced iron using the above coal-based reduction method is liable to have the following problems: the furnace burden is indirectly heated and reduced, the furnace burden stays in the reducing furnace for 50-60 hours, the whole reducing furnace is more than ten meters, on one hand, a large amount of expensive refractory materials for building the high-heat-conductivity reducing furnace are consumed, on the other hand, the distance in the height direction is long, the furnace burden is difficult to be uniformly heated, and the quality of a final product is seriously influenced. In order to solve the above problems, for example, a reducing furnace for producing direct reduced iron disclosed in patent CN205576193U, at least two layers of chokes are provided in a combustion chamber from bottom to top and are staggered with each other. However, considering the actual design, investment and production operation, the method significantly increases the complexity of the reduction furnace and the difficulty of manufacturing the equipment, and the difficulty of maintenance and repair makes the method extremely unlikely to be practically applied to industrial production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a coal-based direct reduction shaft furnace, which can obviously reduce the using amount of a high-heat-conductivity refractory material of an indirect heating reduction furnace, simultaneously realize the integral uniform heating of furnace burden in the furnace and ensure the stable product quality.
The technical scheme includes that the coal-based direct reduction shaft furnace comprises a furnace body, a preheating section is arranged above the outer portion of the furnace body, a material distribution mechanism, a combustion chamber and a cooling section are sequentially arranged in the furnace body from top to bottom, a reduction section penetrates through the combustion chamber, the preheating section is coaxially arranged with the reduction section through the material distribution mechanism, a material outlet of the material distribution mechanism is communicated with a material inlet of the reduction section, a material outlet of the reduction section is communicated with a material inlet of the cooling section, a heat source introducing port is arranged at the lower portion of the preheating section, a high-temperature waste gas outlet is arranged at the upper portion of the combustion chamber, and the high-temperature waste gas outlet is connected with the heat source introducing port of the preheating section through.
Furthermore, a plurality of preheating sections and a plurality of distributing mechanisms are arranged, the number of the preheating sections and the number of the distributing mechanisms are the same, and the preheating sections and the distributing mechanisms are arranged above the distributing mechanisms in a one-to-one correspondence mode.
Furthermore, the reduction section and the material distribution mechanism are provided with a plurality of sections, the material distribution mechanism and the reduction section are same in number and are arranged above the reduction sections in a one-to-one correspondence manner, and the preheating section, the material distribution mechanism and the reduction section which are correspondingly arranged are coaxially arranged.
Further, each reduction stage array is arranged in the combustion chamber.
Furthermore, the number of the cooling sections is multiple, and the cooling sections are correspondingly connected with the discharge holes of the reduction sections one by one.
Furthermore, a plurality of burners are uniformly arranged on the side wall of the combustion chamber along the circumferential direction.
Furthermore, the upper part of the reduction section is provided with a high-temperature coal gas outlet which is connected with the combustion chamber through a coal gas outlet pipe.
Furthermore, the upper part of the reduction section is provided with a high-temperature coal gas outlet which is connected with a coal gas treatment mechanism outside the furnace body through a coal gas branch pipe.
In addition, the invention also provides a reduction method adopting the coal-based direct reduction shaft furnace, which specifically comprises the following steps:
1) preheating: uniformly mixing the agglomerates to be reduced and the carbonaceous reducing agent, loading the uniformly mixed material into a preheating section to run from top to bottom, simultaneously introducing a high-temperature heat source into the preheating section from a heat source introducing port, and running the high-temperature heat source from bottom to top to preheat the uniformly mixed material to 600-900 ℃.
2) Reduction: the preheated briquette to be reduced and the carbonaceous reducing agent enter a reduction section through material distribution of a material distribution mechanism, and the briquette to be reduced and the carbonaceous reducing agent in the reduction section are heated to 1000-1250 ℃ by high-temperature flue gas generated by combustion of a combustion chamber and are subjected to reduction reaction.
3) The briquette to be reduced is reduced into metal, the metal is discharged from the reduction section and then enters the cooling section for cooling, and meanwhile, high-temperature waste gas generated by combustion in the combustion chamber enters the preheating section through a waste gas discharge pipeline for recycling.
Specifically, the briquette to be reduced is a metal oxide briquette or an iron-containing zinc dust briquette, and the carbonaceous reducing agent is anthracite or coke breeze.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the coal-based direct reduction shaft furnace provided by the invention, the preheating section is arranged outside the combustion chamber, so that the preheating section can be built by adopting common heat-insulating refractory materials, the maintenance is simple, the height of a high-heat-conductivity silicon carbide refractory material heat-conducting tank in the combustion chamber is obviously reduced, the consumption of the silicon carbide refractory material is reduced, the investment cost is saved, the height of the combustion chamber is reduced, and the uniformity of the temperature of the reduction section is easy to control.
(2) The heat source used in the preheating section of the coal-based direct reduction shaft furnace provided by the invention is introduced from the combustion chamber, so that the heat efficiency of the reduction shaft furnace is improved, meanwhile, the preheating section adopts a high-temperature flue gas countercurrent direct contact heat transfer mode for preheating, the heat exchange efficiency is high, the heating speed is high, and the production efficiency of the reduction shaft furnace is obviously improved.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a coal-based direct reduction shaft furnace in example 1;
FIG. 2 is a schematic structural view of a coal-based direct reduction shaft furnace in example 2;
FIG. 3 is a schematic structural view of a coal-based direct reduction shaft furnace in example 3;
description of reference numerals: 1. a preheating section; 2. an exhaust gas loop; 3. a furnace body; 4. a material distribution mechanism; 5. a reduction section; 6. a combustion chamber; 7. burning a nozzle; 8. a cooling section; 9. an exhaust gas discharge line; 10. an exhaust gas introduction branch pipe; 11. a heat source inlet; 12. a gas outlet pipe; 13. a gas branch pipe; 14. a coal gas processing mechanism.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example 1:
as shown in fig. 1, the embodiment provides a coal-based direct reduction shaft furnace, which includes a furnace body 3, a preheating section 1 is arranged above the outside of the furnace body 3, a material distribution mechanism 4, a combustion chamber 6 and a cooling section 8 are sequentially arranged in the furnace body 3 from top to bottom, a reduction section 5 is arranged in the combustion chamber 6 in a penetrating manner, the preheating section 1 is coaxially arranged with the reduction section 5 through the material distribution mechanism 4, a discharge port of the material distribution mechanism 4 is communicated with a feed port of the reduction section 5, a discharge port of the reduction section 5 is communicated with a feed port of the cooling section 8, a heat source inlet 11 is arranged at the lower part of the preheating section 1, a high-temperature waste gas outlet is arranged at the upper part of the combustion chamber 6, and the high-temperature waste gas outlet is connected with the heat source inlet 11 of the. Wherein, the distributing mechanism 4 is a distributing device; the horizontal cross-sections of the preheating section 1 and the reduction section 5 are circular or square, preferably circular, to improve the temperature uniformity of each region in the preheating section 1 and the reduction section 5 in the radial direction, thereby improving the uniformity of the reduction reaction.
The process for reducing the briquette to be reduced by adopting the coal-based direct reduction shaft furnace comprises the following steps: firstly, in the process of running from top to bottom in the preheating section 1, the agglomerates to be reduced and the carbonaceous reducing agent are directly contacted with a high-temperature heat source entering from the bottom of the preheating section 1 to transfer heat and preheated to 600-900 ℃, and then enter the distributing mechanism 4, and the agglomerates and the carbonaceous reducing agent are preheated in the preheating section 1 by adopting a high-temperature heat source countercurrent direct contact heat transfer mode, so that the heat exchange efficiency is high, the heating speed is high, and the production efficiency of the reduction shaft furnace can be obviously improved; then, the preheated high-temperature pellets are distributed into the reduction section 5 by the distributing mechanism 4, the agglomerates to be reduced and the carbonaceous reducing agent in the reduction section 5 are further heated to 1000-1250 ℃ by high-temperature flue gas generated by the combustion chamber 6 and are subjected to reduction reaction, the agglomerates to be reduced are reduced into metal, the metal is discharged from the lower part of the reduction section 5 to the cooling section 8 for cooling, and high-temperature waste gas generated by combustion in the combustion chamber 6 at the moment can enter the preheating section 1 through the waste gas discharge pipeline 9 to be used as a high-temperature heat source of the preheating section 1 to preheat the agglomerates to be reduced and the carbonaceous reducing agent, so that the heat utilization efficiency of the reduction shaft furnace is effectively improved, and the leading-out temperature of the high-temperature waste gas is 700-1000 ℃. The briquette to be reduced is a metal oxide briquette or an iron-containing zinc dust briquette, and the carbonaceous reducing agent is pulverized coal, preferably anthracite or coke breeze with higher volatilization temperature. Compared with the prior reduction furnace in which the preheating section and the reduction section are both arranged in the combustion chamber of the furnace body for preheating and reduction, in the embodiment, the preheating section 1 is arranged outside the combustion chamber 6, the maintenance is convenient, and the heat-resistant temperature of the refractory material of the preheating section 1 can be reduced, so that expensive silicon carbide does not need to be selected as the refractory material of the preheating section 1, the common heat-insulating refractory material with low price can be adopted for masonry, the equipment investment cost is reduced, only the reduction section 5 needs to be arranged in the combustion chamber 6, the height of a high-heat-conduction silicon carbide refractory material heat-conducting tank in the combustion chamber 6 is obviously reduced, the consumption of the silicon carbide refractory material is reduced, meanwhile, the height of the combustion chamber 6 is also obviously reduced, and the uniformity of the temperature in.
Certainly, the preheating section 1 is arranged at the other position in the embodiment, and the preheated briquette to be reduced and the carbonaceous reducing agent are distributed into the reduction section through the feeding device and the distributing mechanism, which can achieve the same effect as the embodiment, but compared with the preheating mode in the embodiment that the preheating section 1 is directly arranged at the upper part of the furnace body 3, the complexity of the high-temperature pellet transportation device and the high-temperature flue gas distribution pipe is increased, and the economy and the feasibility of the reduction shaft furnace are not facilitated.
In order to further improve the production efficiency of the reduction furnace, a plurality of preheating sections 1 and a plurality of material distribution mechanisms 4 can be arranged, and the preheating sections 1 and the material distribution mechanisms 4 are the same in number and are arranged above the material distribution mechanisms 4 in a one-to-one correspondence manner; correspondingly, a plurality of reduction sections 5 are also arranged, the material distribution mechanisms 4 and the reduction sections 5 are the same in number and are arranged above the reduction sections 5 in a one-to-one correspondence manner, and the preheating section 1, the material distribution mechanism 4 and the reduction sections 5 which are correspondingly arranged are coaxially arranged. Correspondingly, a plurality of cooling sections 8 can be arranged, and each cooling section 8 is correspondingly connected with the discharge hole of each reduction section 5. In addition, in order to improve the heating temperature of the reduction sections 5 and the uniformity of the reduction reaction, so as to ensure the quality uniformity of the product, it is preferable that each reduction section 5 is arranged in the combustion chamber 6 in an array; and a plurality of burners 7 are uniformly arranged on the side wall of the combustion chamber 6 along the circumferential direction. In order to conveniently guide high-temperature waste gas generated in the combustion chamber 6 into each preheating section 1, one end of a waste gas discharge pipeline 9 is connected into the combustion chamber 6, the other end of the waste gas discharge pipeline is connected with a waste gas circular pipe 2, each preheating section 1 is surrounded in the waste gas circular pipe 2, a plurality of waste gas guide branch pipes 10 are arranged on the waste gas circular pipe 2, and the waste gas guide branch pipes 10 are connected with heat source guide inlets 11 of the preheating sections 1, so that high-temperature waste gas generated in the combustion chamber 6 enters each preheating section 1, and the consistency and uniformity of the temperature in each preheating section 1 are ensured.
Example 2:
as shown in fig. 2, in addition to the structure of the coal-based direct reduction shaft furnace provided in the above embodiment 1, the upper portion of the reduction section 5 is provided with a high temperature gas outlet, and the high temperature gas outlet is connected with the combustion chamber 6 through a gas outlet pipe 12.
In a specific embodiment, agglomerates prepared from iron ore concentrate and carbonaceous reducing agent are loaded into a preheating section 1, the preheating section 1 having a height of 4m, a width of 0.4m and a length of 1.2m, for a total of 4 preheating sections. The briquettes run from top to bottom in the preheating section 1, the high-temperature waste gas generated by the combustion chamber 6 runs from bottom to top, the introduction temperature of the high-temperature waste gas is 800 ℃, the discharge temperature is 200 ℃, the briquettes are heated to 650 ℃ in the preheating section 1 and are distributed into the reduction section 5 of the furnace body 3 through the distributing mechanism 4, the number of the reduction sections 5 is consistent with that of the preheating section 1, the height of the reduction section 5 is 4.2m, the width of the reduction section is 0.4m, the length of the reduction section is 1.2m, the briquettes are heated to 1100 ℃ by high-temperature flue gas generated by combustion of the combustion chamber 6 in the reduction section 5 to generate reduction reaction, sponge iron is produced, the high-temperature sponge iron is thermally conveyed into an electric furnace for steelmaking, and high-temperature coal gas generated by reduction in the reduction section 5 is introduced into the combustion.
Example 3:
as shown in fig. 3, in addition to the structure of the coal-based direct reduction shaft furnace provided in the above embodiment 1, the upper part of the reduction zone 5 is provided with a high-temperature gas outlet, and the high-temperature gas outlet is connected with a gas treatment mechanism 14 outside the furnace body 3 through a gas branch pipe 13.
A specific embodiment, the briquette prepared by metallurgical dust and carbonaceous reducing agent is loaded into a preheating section 1, the preheating section 1 is 4m high, 0.4m wide and 1.2m long, 4 preheating sections 1 are provided, the briquette runs from top to bottom in the preheating section 1, high-temperature waste gas generated by combustion in a combustion chamber 6 of a furnace body 3 runs from bottom to top, the high-temperature waste gas is introduced at 1000 ℃ and discharged at 250 ℃, the briquette is heated to 850 ℃ and is distributed into a reduction section through a distributing mechanism 4, the number of the reduction section 5 is consistent with that of the preheating section 1, the height of the reduction section 5 is 4.2m, the width is 0.4m and the length is 1.2m, the briquette is heated to 1150 ℃ by high-temperature flue gas generated by combustion in the combustion chamber 6 in the reduction section 5, reduction reaction is carried out, sponge iron is produced, and the sponge iron is cooled by a cooling section 8 and then is sent into a blast furnace or a; meanwhile, high-temperature coal gas generated by reduction reaction in the reduction section 5 is introduced into the coal gas treatment mechanism 14 by the coal gas branch pipe 13 for treatment and then can be reused as fuel, so that the energy utilization rate is improved.
In conclusion, the preheating section of the coal-based direct reduction shaft furnace provided by the invention is arranged outside the combustion chamber, so that the consumption of high-heat-conductivity refractory materials for an indirect heating reduction furnace is obviously reduced, the furnace burden is integrally and uniformly heated in the furnace, the stable product quality is ensured, and the process energy consumption is obviously reduced.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. A coal-based direct reduction shaft furnace comprises a furnace body (3), and is characterized in that: a preheating section (1) is arranged above the outer part of the furnace body (3), a material distribution mechanism (4), a combustion chamber (6) and a cooling section (8) are sequentially arranged in the furnace body (3) from top to bottom, a reduction section (5) penetrates through the combustion chamber (6), the preheating section (1) and the reduction section (5) are coaxially arranged through the material distribution mechanism (4), a discharge hole of the material distribution mechanism (4) is communicated with a feed hole of the reduction section (5), a discharge hole of the reduction section (5) is communicated with a feed hole of the cooling section (8), a heat source introducing port (11) is arranged at the lower part of the preheating section (1), a high-temperature waste gas outlet is arranged at the upper part of the combustion chamber (6), and the high-temperature waste gas outlet is connected with the heat source introducing port (11) of the preheating section (1) through a waste gas discharge pipeline (9);
the upper part of the reduction section (5) is provided with a high-temperature coal gas outlet which is connected with the combustion chamber (6) through a coal gas outlet pipe (12).
2. The coal-based direct reduction shaft furnace of claim 1, wherein: the preheating section (1) and the material distribution mechanism (4) are provided with a plurality of parts, the number of the preheating section (1) and the number of the material distribution mechanism (4) are the same, and the preheating section and the material distribution mechanism are arranged above the material distribution mechanism (4) in a one-to-one correspondence mode.
3. The coal-based direct reduction shaft furnace of claim 2, wherein: the reducing sections (5) and the distributing mechanisms (4) are arranged in a plurality, the distributing mechanisms (4) and the reducing sections (5) are the same in number and are arranged above the reducing sections (5) in a one-to-one correspondence manner, and the preheating sections (1), the distributing mechanisms (4) and the reducing sections (5) which are correspondingly arranged are coaxially arranged.
4. The coal-based direct reduction shaft furnace of claim 3, wherein: the reduction sections (5) are arranged in an array in the combustion chamber (6).
5. The coal-based direct reduction shaft furnace of claim 3, wherein: the cooling sections (8) are provided with a plurality of cooling sections, and the cooling sections (8) are correspondingly connected with the discharge holes of the reduction sections (5) one by one.
6. The coal-based direct reduction shaft furnace of claim 1, wherein: and a plurality of burners (7) are uniformly arranged on the side wall of the combustion chamber (6) along the circumferential direction.
7. The reduction method using the coal-based direct reduction shaft furnace according to any one of claims 1 to 6, characterized by comprising: the method comprises the following steps:
1) preheating: uniformly mixing the agglomerates to be reduced and a carbonaceous reducing agent, loading the uniformly mixed material into a preheating section (1) to run from top to bottom, simultaneously introducing a high-temperature heat source into the preheating section (1) from a heat source introducing port (11), and running the high-temperature heat source from bottom to top to preheat the uniformly mixed material to 600-900 ℃;
2) reduction: the preheated agglomerates to be reduced and the carbonaceous reducing agent enter a reduction section (5) through material distribution of a material distribution mechanism (4), and the agglomerates to be reduced and the carbonaceous reducing agent in the reduction section (5) are heated to 1000-1250 ℃ by high-temperature flue gas generated by combustion of a combustion chamber (6) and are subjected to reduction reaction;
3) the briquettes to be reduced are reduced into metal, the metal is discharged from the reduction section (5) and then enters the cooling section (8) for cooling, and meanwhile, high-temperature waste gas generated by combustion in the combustion chamber (6) enters the preheating section (1) through a waste gas discharge pipeline (9) for recycling.
8. A reduction process according to claim 7, wherein: the briquette to be reduced is a metal oxide briquette or an iron-containing zinc dust briquette, and the carbonaceous reducing agent is anthracite or coke breeze.
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| CN109457075A (en) * | 2018-12-20 | 2019-03-12 | 中冶南方工程技术有限公司 | A kind of coal-based DR process using assisted Reduction |
| CN111534659B (en) * | 2020-06-11 | 2023-04-28 | 武汉科思瑞迪科技有限公司 | Parallel heat accumulating type gas-based shaft furnace and method for producing direct reduced iron |
| CN112981030B (en) * | 2021-02-23 | 2022-10-14 | 中冶南方工程技术有限公司 | Reduction shaft furnace |
| CN113088609B (en) * | 2021-04-13 | 2022-06-17 | 黎城太行钢铁有限公司 | Gas double-base reduction furnace and method for manufacturing reduced iron by using same |
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| CN101265510B (en) * | 2008-05-05 | 2010-09-08 | 武汉桂坤科技有限公司 | Fusion reduction reaction furnace and fusion smelting method for metal |
| CN101956037B (en) * | 2010-08-31 | 2012-01-04 | 贾会平 | Method and device for indirect heating type reduction iron making |
| CN103409580B (en) * | 2013-08-10 | 2016-05-11 | 山西鑫立能源科技有限公司 | Continuous external heating type reducing gases DRI integration unit |
| CN104611498A (en) * | 2015-01-19 | 2015-05-13 | 哈密坤铭直还铁有限责任公司 | External heating type coal-based shaft furnace for producing direct-reduced iron |
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| CN105441620A (en) * | 2016-01-05 | 2016-03-30 | 李建涛 | Coal-based direct reduction furnace and reduction method |
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