High-pressure Aluminum-water Reactor

The present disclosure relates to improved metering hoppers for dispensing solid materials, particularly in the context of metered dispensation of solid pellets to feed reactors, in addition to associated methods, systems, and apparatuses. The disclosure relates, in various embodiments, to shielded metering hoppers configured to control the flow of solid material to a feed slot. In some cases, the disclosure relates to pressurized metering hoppers suitable for dispensing solid fuel into gas-generating reactors. Accordingly, the disclosure also relates to pressurized metering hoppers for solid materials, according to some embodiments.