Patent ID: 6039916
Filing Date: 2000-03-21
Classification: C21B,Y02P

Abstract:
An apparatus for reducing particulate iron-oxide-containing particles to produce DRI with a controlled amount of carburization without an external reformer, which comprises:a vertical shaft moving bed reduction reactor having a reducing zone,a reducing gas loop for circulating at least a major portion of the top effluent gas from the reducing zone of said reactor for conditioning and upgrading and return as improved recycle reducing gas to the reducing zone of said reactor,said loop including:a cooling and scrubbing unit for cooling and cleaning said top effluent gas,pump for circulating recycle reducing gas through said loop and said reactor,a carbon dioxide removal unit for removal of carbon dioxide from the recycle reducing gas,a gas heater capable of raising the temperature of the gas stream circulating through said loop to the range between 850.degree. C. and 1000.degree. C.,means for adjusting the water content of the recycle reducing gas,means for mixing natural gas with said recycle reducing gas, andmeans for mixing and controlling an amount of an oxygen-containing gas with said recycle reducing gas before said gas enters said reactor.