Hydrogen-rich gas CO2 oxidative conversion and hydrogen-based shaft furnace direct reduction iron production method

The invention relates to a hydrogen-rich gas CO2 oxidative conversion and hydrogen-based shaft furnace direct reduction iron production method. The method comprises the following steps: mixing pre-treated hydrogen-rich gas and pre-treated shaft furnace top gas, and producing reducing gas meeting the requirements of a hydrogen-based shaft furnace through a raw material gas treater and a protective bed layer by virtue of a CO2 oxidative conversion furnace; the reducing gas is reacted and utilized in the hydrogen-based shaft furnace to generate top gas, most of the top gas serves as conversion feed gas, and a small part of the top gas serves as conversion fuel gas and is recycled. The invention belongs to the field of ferrous metallurgy and hydrogen-rich gas cyclic utilization, completely meets the requirement of a hydrogen-rich gas efficient utilization approach, does not need CO2 removal and storage in a production system and method, takes CO2 as a raw material, and provides a feasible method and thought for l