Method and installation for producing direct reduced iron
A direct technology for reducing iron, applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of expensive purchase and maintenance of PSA/VPSA equipment
Inactive Publication Date: 2012-02-29
PAUL WURTH SA
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
In addition, although the PSA / VPSA unit allows the CO in the top gas 2 The content is greatly reduced, i.e. from about 35% to 5%, but PSA / VPSA units are expensive to acquire, maintain and operate and require a lot of space
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[0027] figure 1A plant 10 for the production of direct reduced iron is generally shown, comprising a vertical reactor 12 with an exhaust gas cleaning system 13 and a reducing gas circulation device 14 . The vertical reactor 12 has an upper reduction zone 16 and a lower cooling zone 18 . A charge of iron oxide feed 20 is fed to the upper portion 22 of the reduction zone 16 of the vertical reactor 12 and forms a charge that flows under gravity to the lower portion 24 of the cooling zone 18 of the vertical reactor 12 . Reducing gas is supplied to the vertical reactor 12 at the lower portion 26 of the reduction zone 16 . The reducing gas flows to the upper portion 22 of the reduction zone 16 in countercurrent to the charge. Due to the interaction between the charge and the reducing gas, the iron oxide feed 20 is converted to direct reduced iron 27 which is extracted from the lower portion 24 of the cooling zone 18 of the vertical reactor 12 . The operation of such a vertical re...
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Abstract
The present invention proposes a method for producing direct reduced iron in a vertical reactor (12) having an upper reducing zone (16) and a lower cooling zone (18), the method comprising the steps of: feeding iron oxide feed material (20) to an upper portion (22) of the vertical reactor (12), the iron oxide feed material (20) forming a burden flowing by gravity to a material outlet portion in a lower portion (24) of the vertical reactor (12); feeding hot reducing gas to a lower portion (26) of the reducing zone (16) of the vertical reactor (12), the hot reducing gas flowing in a counter flow to the burden towards a gas outlet port in the upper portion (22) of the vertical reactor (12); recovering direct reduced iron (27) at the lower portion (24) of the vertical reactor (12); recovering top gas at the upper portion (22) of the vertical reactor (12); submitting at least a portion of the recovered top gas to a recycling process; and feeding the recycled top gas back into the vertical reactor (12). According to an important aspect of the invention, the recycling process comprises heating the recovered top gas in a preheating unit before feeding it to a reformer unit (36); feeding volatile carbon containing material (38) to the reformer unit (36) and allowing the volatile carbon containing material (38) to devolatise and to react with the recovered top gas; feeding desulfurizing agent (40, 42) into the recovered top gas in or upstream of the reformer unit (36); heating the reformer unit (36); and feeding the reformed top gas recovered from the reformer unit (36) through a particle separation device (46)for removal of sulfur containing material (45).
Description
technical field [0001] The present invention generally relates to a process for the production of direct reduced iron (DRI), in particular in a vertical reactor. The invention also relates to a plant for the production of direct reduced iron. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is produced by the direct reduction of iron ore (in the form of lumps, pellets or granules) by reducing gases from natural gas or coal. The direct reduction of iron ore usually takes place in a vertical reactor in which the iron ore charge flows downwards and the reducing gas flows upwards and reacts with the charge. [0003] Most installations use natural gas as a fuel source to produce DRI. The reducing gas required for the removal of chemically bonded oxygen from iron oxide is generated in a complex process gas system in which CO 2 and H 2 O is converted to CO and H by natural gas 2 . It should be noted that the installations for producing the r...
Claims
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IPC IPC(8): C21B13/02
CPCC21B13/02C21B2200/00C21B2100/64C21B2100/66C21B2100/22C21B2100/42Y02P10/134Y02P10/20Y02P10/25
Inventor 让-卢卡·罗特戴维·罗德里格斯
Owner PAUL WURTH SA