Systems and methods for producing green hydrogen from a source material (e.g., biowaste) are contemplated. The source material is at least partially dehydrated to produce a dried intermediate and recovered water. The dried intermediate is pyrolyzed to produce syngas and a char. The recovered water is electrolyzed to produce oxygen and green hydrogen.

Apparatuses, systems, and associated methods relate to actively cooling and transporting a fuel to a gasification reactor vessel. An actively cooled gasifier screw feeder can include a screw feeder having a first coolant path arranged therethrough and arranged to actively transport the fuel, a sleeve arranged in coaxial relation and about the screw feeder having a second coolant path arranged therethrough, a coolant reservoir arranged to receive, store, and supply a coolant to the first and second coolant paths, and a coolant pump in operative communication with the coolant reservoir and arranged to pump the coolant. The actively cooled gasifier screw feeder is configured to actively cool and feed the fuel into the gasification reactor vessel at a fuel feed rate based upon a type of the fuel and during steady-state operation of the gasification reactor vessel.

A system and a method for preparing hydrogen-rich syngas by taking biogas as a composite gasification agent for the gasification of biogas residue are provided. The system includes an anaerobic fermenter for biomass gradient, a solid-liquid separation device, a drying reactor, a gasification reactor, a condensing tower, and a syngas purifier; the anaerobic fermenter for biomass gradient is connected to the drying reactor through the solid-liquid separation device, to transport separated biogas residue to the drying reactor, and the drying reactor and the anaerobic fermenter for biomass gradient are connected to the gasification reactor, respectively, to jointly input biogas and a biogas residue dried into the gasification reactor for reaction; and the gasification reactor is connected to the condensing tower, to transport reaction products to the condensing tower, the condensing tower is connected with the syngas purifier, performing purification treatment on a gas cooled, to obtain the hydrogen-rich syngas.