Hydrogen Direct Reduction: 2D Shrinking-Core Kinetics

This 2D companion to the 3D H2-DRI shaft-furnace simulator keeps the same real shrinking-core reduction kinetics — an outer Fe2O3 oxide shell and an inner metallic-iron core whose radius recedes at an Arrhenius-controlled rate as hydrogen gas reduces it — but represents the furnace as a schematic side cross-section computed on its own 2D grid rather than a flattened camera view of a 3D scene, and pairs it with a genuinely 2D-native diagnostic: a live closed-form curve of core fraction and metallization degree plotted directly against residence time, something the 3D version has no equivalent for. Adjust reduction-zone temperature, hydrogen excess ratio and pellet descent speed to watch the kinetics curve steepen or flatten in real time, or switch to the blast-furnace route to compare the CO2 this process avoids by producing water vapor instead of carbon dioxide.