Process and installation for producing substitute gas

摘要

A process and an installation for reducing particulate material containing iron oxide are shown, wherein the material containing iron oxide is at least partially reduced with reducing gas in a reducing zone and the waste gas produced during the reduction is drawn off and subsequently subjected to CO2 cleaning in a CO2 separating device (1), in which a tail gas containing CO2 is separated. The tail gas is subjected to combustion and subsequent dewatering in a dewatering device (5), the substitute gas thereby formed being used as a substitute for inert gas.

主权项

1. A process for reducing particulate material containing iron oxide, comprising:
reducing the material containing iron oxide at least partially with reducing gas in a reducing zone, drawing off the gas produced during the reduction as waste gas and subsequently subjected the gas to CO2 separation, in which a tail gas containing CO2 is separated, in order to balance out fluctuations in the amount and calorific value, temporarily storing the tail gas in a gas accumulator, mixing the tail gas with a gas containing oxygen or pure oxygen, combusting the mixed tail gas in a burner system, thereby forming a substitute gas, the substitute gas being used after dewatering as a substitute for inert gas or instead of nitrogen, wherein at least part of the substitute gas being mixed with the gas containing oxygen and being returned to the burner system after at least one of dewatering and compression for setting the combustion temperature during the combustion of the tail gas.