| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 075488000 | Reduction to metallic Iron(Fe) within shaft furnace | 12 |
| 20120031236 | METHOD AND INSTALLATION FOR PRODUCING DIRECT REDUCED IRON - “A method for producing direct reduced iron in a vertical reactor having an upper reducing zone and a lower cooling zone, the method including:
| 02-09-2012 |
| 20130312571 | SYSTEM AND METHOD FOR REDUCING IRON OXIDE TO METALLIC IRON USING COKE OVEN GAS AND OXYGEN STEELMAKING FURNACE GAS - Novel systems and methods are described for reducing iron oxide to metallic iron in an integrated steel mill or the like that has a coke oven and/or an oxygen steelmaking furnace. More specifically, the present invention relates to novel systems and methods for reducing iron oxide to metallic iron using coke oven gas (COG) or COG and basic oxygen furnace gas (BOFG). | 11-28-2013 |
| 20140053686 | SYSTEM AND METHOD FOR REDUCING IRON OXIDE TO METALLIC IRON USING NATURAL GAS - In various exemplary embodiments, the present invention provides systems and methods that can convert clean or raw natural gas, clean or dirty coke oven gas, or the like to reducing gas/syngas suitable for direct reduction with minimal processing or cleaning. Hydrocarbons and the like are converted to H | 02-27-2014 |
| 20140230606 | IRONMAKING PROCESS AND INSTALLATION - Ironmaking method and installation with recirculation of exhaust gas as a reduction gas and whereby part of the exhaust gas is purged upstream and/or downstream of a CO/CO | 08-21-2014 |
| 075489000 | Externally supplied gas reductant | 7 |
| 20140150607 | PROCESS FOR DIRECT REDUCTION OF IRON OXIDE - A process for direct reduction of iron oxide in a shaft furnace. The furnace has a pre-reduction zone near its uppermost portion, a metallization zone below the pre-reduction zone, an intermediate zone which separates the pre-reduction zone from the metallization zone and which includes a restriction to inhibit rich fuel gas from passing from the pre-reduction zone to the metallization zone, and a cooling zone below the metallization zone at the lowest portion of the furnace. The process includes feeding iron oxide to the furnace, passing the iron oxide successively downwardly through the pre-reduction zone, the transition zone, the metallization zone, and the cooling zone while passing rich fuel gas produced by external partial combustion with a sub-stoichiometric volume of air upwardly through the pre-reduction zone in counter-current flow so as to partially reduce the iron oxide, and passing reducing gas downwardly through the metallization zone in co-current flow so as to substantially complete the reduction of the iron oxide to metallic iron. The reducing gas is first pre-heated in a gas heater and then subjected to partial combustion with oxygen to further increase its temperature. The process includes removing a metallized iron product from the cooling zone. | 06-05-2014 |
| 20160168652 | DESULFURIZATION OF GASES IN THE PRODUCTION OF PIG IRON | 06-16-2016 |
| 075490000 | Solid Iron(Fe) produced within shaft furnace | 5 |
| 20160251735 | METHODS AND COMPOSITIONS FOR DECREASING ADHERENCE OF IRON OXIDE PELLETS USED IN DIRECT REDUCTION PROCESSES | 09-01-2016 |
| 075493000 | Using solid Carbon(C) to generate gas in separate furnace (e.g., Wiberg process, etc.) | 3 |
| 20160017445 | METHODS AND SYSTEMS FOR PRODUCING DIRECT REDUCED IRON AND STEEL MILL FUEL GAS USING COKE OVEN GAS AND BASIC OXYGEN FURNACE GAS - A process for producing reducing gas for use in the production of direct reduced iron (DRI) and fuel gas for use in a steel mill, comprising: compressing a coke oven gas (COG) stream in a compressor; passing the compressed coke oven gas stream through an activated charcoal bed to remove tars from the compressed coke oven gas stream; separating a hydrogen-rich gas stream from the compressed cleaned coke oven gas stream using a pressure swing absorption unit; providing the hydrogen-rich gas stream to a direct reduction shaft furnace as reducing gas; and providing a remaining gas stream from the pressure swing absorption unit to a steel mill as fuel gas. Both once-through and recycle options are presented. Optionally, basic oxygen furnace gas (BOFG) is added to the reducing gas. Optionally, top gas from the direct reduction shaft furnace is cooled, cleaned, and recycled back to the reducing gas stream. In some cases, carbon dioxide is also removed from the top gas stream. | 01-21-2016 |
| 20160017447 | METHODS AND SYSTEMS FOR PRODUCING DIRECT REDUCED IRON UTILIZING A PETROLEUM REFINERY BOTTOMS OR PETROLEUM COKE GASIFIER AND A HOT GAS CLEANER - Methods and systems for producing DRI utilizing a petroleum refinery bottoms (i.e. heavy fuel oil, vacuum residue, visbreaker tar, asphalt, etc.) or petroleum coke gasifier and a hot gas cleaner. Cooling of the hot synthesis gas generated by the petroleum refinery bottoms or petroleum coke gasifier to <200 C is not necessary. Rather, the synthesis gas from the petroleum refinery bottoms or petroleum coke gasifier is desulfurized and dedusted at high temperature (>350 C) using a hot gas cleaner, well known to those of ordinary skill in the art, although not in such an application. This hot gas cleaner may be high pressure or low pressure. | 01-21-2016 |
| 20160083811 | METHOD FOR REDUCING IRON OXIDE TO METALLIC IRON USING COKE OVEN GAS - The present invention provides a method for reducing iron oxide to metallic iron using coke oven gas, including: dividing coke oven gas from a coke oven gas source into a plurality of coke oven gas streams; providing a first coke oven gas stream to a hydrogen enrichment unit to form a hydrogen-rich product stream that is delivered to a reduction shaft furnace as part of a reducing gas stream; and providing a tail gas stream from the hydrogen enrichment unit to a reforming reactor to form a reformed gas stream that is delivered to a reduction shaft furnace as part of the reducing gas stream. Optionally, a spent top gas stream from the reduction shaft furnace is cleansed of CO | 03-24-2016 |
| 075496000 | With reformation of reducing gas in separate furnace (e.g., Midrex process, etc.) | 1 |
| 20160002744 | DIRECT REDUCTION PROCESS WITH IMPROVED PRODUCT QUALITY AND PROCESS GAS EFFICIENCY - A direct reduction process producing DRI from iron oxide particles by reduction at a about 750° C. with a reducing gas mainly H | 01-07-2016 |
| 075499000 | Molten Iron(Fe) produced in shaft furnace | 1 |
| 20140298955 | TOP-BLOWING LANCE AND METHOD FOR REFINING MOLTEN IRON USING THE SAME - A top-blowing lance includes a refining oxygen gas blowing nozzle having a plurality of ejection openings through which oxygen gas is blown into an iron bath in a reaction vessel, the ejection openings being disposed along a circular orbit at intervals, and a burner nozzle having an axis coaxial with the central axis of the circular orbit, forming a flame inside the refining oxygen gas blowing nozzle, and having ejection openings for blowing a powder heated by the flame into the iron bath, wherein an indicator A that indicates the positional relationship between the ejection openings of the refining oxygen gas blowing nozzle and the ejection openings of the burner nozzle satisfies the specified conditions. | 10-09-2014 |
