| 摘要 |
The stack gas from a shaft furnace in which iron ore is directly reduced is cooled in a venturi scrubber and then in the presence of steam is treated in a converter so as to transform its carbon monoxide into carbon dioxide and water. The carbon dioxide and water are then scrubbed out of the stack gas in another scrubber so as to leave virtually pure hydrogen which is brought in a heater to a temperature between 400.degree.C and 600.degree.C and added to the output of an oxygen reactor that transforms coal or heavy oil and oxygen into a synthetic gas having a carbon-monox-ide/hydrogen volume ratio of at least 1.5:1. The addition of this hydrogen to the output of the reactor lowers the CO/H2 volume ratio to 1:1 at most so that this mixture is reintroduced into the shaft furnace at a temperature of around 1000.degree.C as a reducing gas. Since, by this system, the reduction has is brought, after separation of water and particulates to a temperature of say 1000.degree.C prior to introduction into the furnace, the danger of soot formation is eliminated. |
