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| Number | Title | Issue Date |
| 6692549 | Methods for integration of a blast furnace and an air separation unit The present invention generally relates to processes and apparatuses for the integration of a blast furnace and an air separation plant to increase blast furnace production. The present invention recovers energy from the air separation through the expansi... | 02/17/2004 |
| 6263659 | Air separation process integrated with gas turbine combustion engine driver A method for the separation of a feed gas mixture comprising oxygen and nitrogen in which an oxidant gas and fuel are combusted in a combustion engine to generate shaft work and a hot exhaust gas, the feed gas mixture comprising oxygen and nitrogen is com... | 07/24/2001 |
| 6206949 | NOx reduction using coal based reburning A method for reducing the NOx content of combustion gases from combustion in a commercial furnace wherein hot oxygen and carbonaceous fuel such as pulverized coal react to form a fuel-rich gas phase mixture which is then used to reduce NOx to nitrogen gas... | 03/27/2001 |
| 6126717 | Steel-making method and plant A method wherein air is separated in an air separation unit (9), the oxygen thus generated is consumed during at least one step (2, 12, 13) of the steel-making process, the resulting gas is at least partially decarbonated, and the at least partially decar... | 10/03/2000 |
| 6090182 | Hot oxygen blast furnace injection system A method for providing a blast stream into a blast furnace wherein fuel and hot oxygen are provided into the blast air, the hot oxygen being at a temperature and velocity each greater than that of the blast air, and wherein the fuel and hot oxygen begin t... | 07/18/2000 |
| 6062043 | Process for feeding a gas-consuming unit A gas-consuming unit (HF) is fed partially by a flow delivered directly by a compression unit (21) and partially by one delivered by a separation apparatus (25) which is itself fed by a flow delivered directly by the compression unit. Another flow produce... | 05/16/2000 |
| 6045602 | Method for integrating a blast furnace and a direct reduction reactor using cryogenic rectification A method for increasing iron production by integrating blast furnace ironmaking with direct reduction ironmaking wherein cryogenic rectification links the two systems and produces input materials for both.... | 04/04/2000 |
| 5980607 | Steelmaking method with oxygen from rectification of air A method of supplying both an oxygen steelmaking process and an ironmaking process with oxygen. The oxygen is separated from air by rectification of the air. A first stream of oxygen from the rectification to the steelmaking process. A second stream of ox... | 11/09/1999 |
| 5538534 | Combined installation of a metal production unit and a unit for the separation of air gas The combined installation comprises at least one metal production unit (II), including at least one, and typically a series of metal production or treatment units (1-6), and at least one air gas separation unit (III) including at least one outlet for at l... | 07/23/1996 |
| 5522916 | Method and apparatus for injecting liquid oxygen A high-speed jet of liquid oxygen (21) with a speed higher than 100 meters per second is delivered into the tuyeres of a blast furnace of cupola furnace together with pulverised carbon. The jet reaches the opposite wall of the cavity (9) formed at the out... | 06/04/1996 |
| 5317862 | Air separation In a process integration, particularly with a blast furnace, nitrogen under pressure is moisturized by the addition to it of hot, pressurized water. The moisturized nitrogen is expanded and power thereby generated. The nitrogen is not mixed with combustio... | 06/07/1994 |
| 5295351 | Air separation In a process integration, particularly with a blast furnace, low grade fuel gas produced by the furnace is compressed and moisturized. The moisturized fuel is burnt using a major part of a compressed air stream to support its combustion. The resulting com... | 03/22/1994 |
| 5268019 | Air separation method and apparatus combined with a blast furnace Air is taken from the air compressor of a gas turbine including in addition to the compressor a combustion chamber and an expansion turbine. The gas turbine drives an alternator. The air taken from the compressor is cooled in heat exchanger to remove heat... | 12/07/1993 |
| 5244489 | Process for supplying a blast furnace with air enriched in oxygen, and corresponding installation for the reduction of iron ore There is produced by an air distillation apparatus (4) a desired fraction of air from the stream of air leaving at least one blower (3) of the blast furnace, and there is sent to the blast furnace the oxygen produced by this distillation apparatus. The di... | 09/14/1993 |
| 4985075 | Method for manufacturing chromium-bearing pig iron A method for manufacturing a chromium-bearing pig iron comprises the steps of charging cold bond pellets, iron ore and coke lumps into a blast furnace from above and blowing a gas containing more than 50% oxygen therein and tuyere nose flame temperature c... | 01/15/1991 |
| 4917727 | Method of operating a blast furnace According to a method of operating a blast furnace, pure oxygen, pulverized coal, and a temperature control gas which substantially does not contain nitrogen are blown from tuyeres. A preheating gas which substantially does not contain nitrogen is blown f... | 04/17/1990 |
| 4617182 | Cascade heat recovery with coproduct gas production A process for the integration of a chemical absorption separation of oxygen and nitrogen from air with a combustion process is set forth wherein excess temperature availability from the combustion process is more effectively utilized to desorb oxygen prod... | 10/14/1986 |
| 4529440 | Chemicals from coal A process for the coproduction of molten ferrous metals and hydrogen-carbon monoxide adducts from a blast furnace whose hot blast is replaced by oxygen and a suspension of coal in recycle gas; whereby the top gas or gas removed from the stack at a point b... | 07/16/1985 |
| 4521246 | Operating a blast furnace with the injection of hot reducing gases Hot reducing gases, mainly containing CO, H2, and optionally N2, as well as smaller quantities of H2 O and CO2, are injected through some of the tuyeres. Hot air, hot superoxygenated air, recycled gas, or combus... | 06/04/1985 |
| 4345939 | Method for providing oxygen enhanced air for use in metallurgical processes Methods and apparatus are provided for regulating the percentage quantities of individual gases present in the combustion air supplied for reaction processes in metallurgy. This is achieved by utilizing molecular sieve absorption processes upon the intake... | 08/24/1982 |
| 4158562 | Blast furnace testing and control methods A method for evaluating and/or controlling a blast furnace operation is disclosed wherein the carbon content of off-gases is measured at a test point located downstream of the wet scrubber.... | 06/19/1979 |
