TH13972A - A process for direct reduction of materials containing fine powdered iron oxide. - Google Patents

Abstract

In a process for direct reduction of fine powdered iron oxide materials by a fluidized bed method with a modified gas mixture. With the upper gas generated by the reduction of ferrous materials. Oxide is directly and fed as a reducing gas in the fluidized bed reduction area to reduce the amount of energy required and to utilize the reducing gas potential, removing CO2. out From both the top gas and the transformed gas and adjust the amount of H2 in the reducing gas obtained By mixing the above gas with the transformed gas In the range between 45 and 75%, choose between 50 and 65% and have the CO content between 10 and 20%.

Claims (9)

1.Process for direct removal of fine powdered iron oxide materials with a method that Use a fluidized bed that mixes the reformed gas with the topgas formed directly from the reduction of the material containing the fine powder iron oxide. And feed it into redoxing gas In the fluidized bed reduction area It has a specific characteristic that removes CO2 from both above gases. And the transformed gas and to adjust the amount of H2 in the reducing gas obtained from the mixing of the gas. The above, with the converted gas between 45 and 75%, should be chosen between 50 and 65% and the CO content is between 8 and 20%. 2. The process according to claim 1 has specific characteristics that adjust the amount of H2 and CO in the reduction of gas by means of the operation method of the reformer (10) ratio. Of the steam / natural gas that has been released, preferably in the range between 2.5 and 3.5 that were found to be similar. With the operating methods of the commonly used gas conversion units. 3. The process according to claim 1 or 2 has specific characteristics that adjust the amount of CH4 nitridizing gas. Be in the channel between 8 and 35%. 4. Process according to any 1 to 3 claim There are specific characteristics that reduce by Occupies in the multiple fluidized bed pressing area Arranged in a sequence Remove the gas from One reduction area to the next reduction area, in contrast to the flow of Materials containing iron oxide are very fine powder and partially burned by oxygen input. Go in the fluidized bed reduction area, at least in the last bed of redunding gas. 5. Procedures according to claim 1 to 4, any one of the specific characteristics in which the reduction of gas that is Used to reduce the reconstituted oxygen that has arisen, adding part of it to the reduction area. Fluidized bed type after first organized fluidized bed pressing area. Directly seen In the direction of the flow of redoxing gas Should be used in quantities from 5 to 15%. 6. Factory for processing the process according to one of the claims 1 to 5 Included At least one fluidized bed reactor (1 to 4) for receiving material containing iron oxide, has a redundant gas feed tube (17) that is fed into the fluidized reactor. This bed (1 to 4), and the upper output gas pipe (8) from the fluidized bed reactor (1), the top gas is formed by the reduction process, The reformer (10), the transformed gas pipe (13) exiting the gas conversion unit (10), and connected to the upper exit gas discharge (8) the redox. Gas obtained from The transformed gas and the top gas enter the fluidized bed reactor (1 to 4) through the pipe for feeding the redox gas (17), including the CO2 removal section (16). At both the transformed gas hose (13) and the upper exit gas hose (8), enter the CO2 decarbonization section (16) and the oxygen reducing gas feeder (17) taken from the CO2 removal section. (16) To the fluidized bed reactor (1 to 4). 7. The plant according to claim 6 is characterized in that a number of (1 to 4) fluidized bed reactors are arranged sequentially through which iron oxide-containing materials are delivered from the fluidized bed reactor. One bed (1 to 4) goes to the other reactor via a pipeline (6) in one direction and reduces the gas from the reactor with One fluidized bed (1 to 4) goes to the other reactors via connecting pipes (19) in the opposite direction, and at, in addition to the pipes (19) that feed the reduction. The gas released from the Guess the organized fluidized bed reactor. Previously, there was also an oxygen feed tube (25) and, if desired, had at least one (1) plugged into the fluidized bed reactor (1) provided. Finally in the direction of flow Reduction of gas 8. Factories according to claim 6 or 7 have specific characteristics in which a number of (1 to 4) fluidized bed reactors are arranged sequentially, delivering materials containing iron oxide. From fluidized bed reactors (1 to 4) to other reactors via pipeline (6) in one direction and redoxing gas from the furnace. One fluidized bed reactor (1 to 4) goes to the other reactor via a connecting pipe (19) in the opposite direction, and a fluidized bed reactor. (1 to 3) in addition to arrangement in order Also, they are arranged in parallel as opposed to the additional reduction gas feeder in terms of gas redoxification tubes. 9. The plant according to claim 8 has specific characteristics in which all four fluidized bed reactors are arranged in order.