NOVELTY - The solar-driven bio-refinery (800) with an entrained-flow biomass feed system, comprises a solar-driven chemical reactor aligned to receive concentrated solar thermal energy from solar energy concentrating fields including an array of heliostats and/or a solar concentrating dishes, and a feeding vessel of the biomass feed system that supplies a tube subset of reactor tubes in the solar-driven chemical reactor. The entrained-flow biomass feed system is feedstock flexible via a particle size control of the biomass, and has a gas source for an entrainment carrier gas and feed lines.    USE - Used as a solar-driven bio-refinery.    ADVANTAGE - The solar-driven bio-refinery ensures feedstock flexibility in the particles of biomass without need for an exothermic/endothermic reaction balancing in the chemical reactor, and increases the operability of raw biomass materials.    DETAILED DESCRIPTION - The solar-driven bio-refinery (800) with an entrained-flow biomass feed system, comprises a solar-driven chemical reactor aligned to receive concentrated solar thermal energy from solar energy concentrating fields including an array of heliostats and/or a solar concentrating dishes, and a feeding vessel of the biomass feed system that supplies a tube subset of reactor tubes in the solar-driven chemical reactor. The entrained-flow biomass feed system is feedstock flexible via a particle size control of the biomass, and has a gas source for an entrainment carrier gas and feed lines to supply different biomass sources fed individually or in combinational mixtures as particles (810) into the solar-driven chemical reactor. The biomass sources includes rice straw, rice hulls, corn stover, switch grass, non-food wheat straw, miscanthus, orchard wastes, forestry thinnings, forestry wastes, sorghum, and source separated green wastes in a raw state or partially torrified state. A few parameters including particle size of the biomass supplied by the feed lines are controlled without having to change the components making up the feed system. The concentrated solar thermal energy drives gasification of the particles of the biomass in the chemical reactor to generate hydrogen and carbon monoxide products from the gasification reaction. The feeding vessel has outlets to supply a consistent volumetric amount of biomass particles within 10% of the demand signal amount when biomass particles distribute to the reactor tubes.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a solar-driven bio-refinery.    Solar-driven bio-refinery (800)    Solar power (802)    Window or aperture (804)    Solar heated reactor chamber (806)    Quencher (808)    Biomass particles. (810)