| 摘要 |
<p>Crushed iron ore and ore fines without distinction are incorporated by chemical reaction into a closed- loop melt circulation reactor to form a thin liquid floating oxidic layer comprised initially principally of molten wustite. Hydrogen reduction is gas phase diffusion controlled so is unaffected by total pressure. Energy requirements are supplied by a carrier medium of molten iron circulating within an unmelted steel shell. Post-combustion of reduction off-gas is inherently dangerous so the reduction off-gas has no direct access to post-combustion. A multiple array of axi-symmetric turbulent jets inject clean hydrogen into the gas freeboard in the post-combustion zone to entrain the surrounding gas phase, predominantly turbulent flowing water vapour containing minor oxygen. Major recirculation of post- combustion off-gas is achieved using a gas ejector empowered by compressed oxygen as dictated for safe combustion. Atmospheric pressure operation is recommended with low-pressure steam enshrouding all plant containing hydrogen for enhanced safety.</p> |
