Hydrogen generation assemblies and hydrogen purification devices

A steam reforming hydrogen generation assembly configured to receive at least one feed stream and generate a reformate stream containing hydrogen gas as a majority component and other gases, comprising:

• an enclosure having a bottom portion;
• a hydrogen-producing region contained within the enclosure and including a reforming catalyst, the hydrogen-producing region being configured to produce, via a steam reforming reaction, the reformate stream from the at least one feed stream;
• a heating assembly configured to receive at least one air stream and at least one fuel stream and to combust the at least one fuel stream within a combustion region contained within the enclosure producing a heated exhaust stream for heating at least the hydrogen-producing region to at least a minimum hydrogen-producing temperature;
• and
• a fuel distribution assembly attached to the bottom portion of the enclosure and configured to distribute the at least one fuel stream into the combustion region, the fuel distribution assembly including:
• a base including at least one passage that is in fluid communication with the combustion region,
• a mesh assembly supported on the base,
• a top wall having a perimeter,
• at least one side wall having a top portion and a bottom portion, the top portion being mounted around the perimeter and the bottom portion being supported on the mesh assembly such that a fuel stream distribution region is formed within the at least one side wall and between the top wall and the mesh assembly,
• an inlet into the fuel stream distribution region, and
• a fuel stream conduit fluidly connected to the inlet and configured to receive the at least one fuel stream, wherein the mesh assembly includes at least one pathway for the at least one fuel stream to flow from the fuel stream distribution region to the combustion region.