METHOD AND APPARATUS FOR PRODUCING DIRECT REDUCED IRON UTILIZING A CATALYTICAL PRETREATMENT OF HYDROCARBONS AS A SOURCE OF REDUCING GAS
A method and apparatus for producing direct reduced iron, said method comprising producing direct reduced iron using a pre-treated make-up gas as a reducing agent in a direct reduced iron reactor (10), and wherein producing direct reduced iron is carried-out using a zero-reformer process in which ca...
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Zusammenfassung: | A method and apparatus for producing direct reduced iron, said method comprising producing direct reduced iron using a pre-treated make-up gas as a reducing agent in a direct reduced iron reactor (10), and wherein producing direct reduced iron is carried-out using a zero-reformer process in which catalytic reformation of the pre-treated make-up gas is carried-out "in situ" within the direct reduced iron reactor (10) such that the pre-treated make-up gas is subjected to no further catalytic reaction besides the catalytic reactions that occur inside said direct reduced iron reactor (10),characterized in thatsaid method comprises: - pre-treating a stream of said make-up gas containing heavy hydrocarbons by subjecting the stream of make-up gas to a low temperature adiabatic reforming at a temperature comprised between 300°C and 600°C, prior to using said stream of make-up gas as a reducing agent for producing direct reduced iron; - subjecting said pre-treated stream of make-up gas to adjusting humidity content of said stream of make-up gas after said low temperature adiabatic reforming by bypassing said stream of make-up gas to selectively split said stream into a first part (128) of said stream of make-up gas and a second part (130) of said stream of make-up gas and subjecting said first part (128) to a water separation and then mixing said first part (128) to said second part (130) to obtain a reducing stream (146) to be sent to direct reduced iron production.
La présente invention concerne un procédé et un appareil de production de minerai de fer préréduit, ledit procédé comprenant la production de minerai de fer préréduit au moyen d'un gaz d'appoint prétraité en tant qu'agent réducteur dans un réacteur de fabrication de minerai de fer préréduit (10), et la production de minerai de fer préréduit étant conduite au moyen d'un procédé "zero-reformer" dans lequel le reformage catalytique du gaz d'appoint prétraité est effectué "in situ" à l'intérieur du réacteur de fabrication de minerai de fer préréduit (10) de sorte que le gaz d'appoint prétraité ne soit soumis à aucune réaction catalytique supplémentaire en plus des réactions catalytiques qui se produisent à l'intérieur dudit réacteur de fabrication de minerai de fer préréduit (10), caractérisés en ce que ledit procédé comprend : - le prétraitement d'un flux dudit gaz d'appoint contenant des hydrocarbures lourds par soumission du flux de gaz d'appoint à un reformage adiabatique à basse température à une temp |
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