Apparatus for reducing finely divided iron oxide material

摘要

PCT No. PCT/SE80/00153 Sec. 371 Date Jan. 29, 1981 Sec. 102(e) Date Jan. 6, 1981 PCT Filed May 28, 1980 PCT Pub. No. W080/02652 PCT Pub. Date Dec. 11, 1980.Apparatus for reducing finely divided iron oxide material, comprising a reactor containing a vertical upper reaction chamber connected downwardly to a narrower, vertical reaction chamber. A cyclone separator is connected to the upper reaction chamber for separating solid material and recycling it to the reactor so that a circulating fluidized bed can be maintained in the apparatus. In accordance with the invention, a recycling conduit is connected to the bottom of the lower reaction chamber. A tapping-off shaft for reduced material is also connected to the bottom of the lower reaction chamber. A reducing agent is supplied to the upper reaction chamber, and combustion air is supplied to the bottom of the upper reaction chamber. The apparatus also comprises means for preheating the iron oxide material with the exhaust gas from the reactor and for passing said preheated iron oxide into the lower reaction chamber. The apparatus also comprises means for stripping the exhaust gas from CO2 and H2O and recycling it to the reactor to be used as fluidizing gas.