NOVELTY - Method of producing chemicals in integrated plant to produce fuel, involves (a) providing chemical reactor having multiple reactor tubes located inside cavity of thermal receiver, where e.g. simultaneous biomass gasification reaction and steam methane reforming reaction is performed by radiant heat, (b) supplying the particles of biomass from e.g. forestry wastes, or another woody source from feed system to the multiple reactor tubes, and (c) performing the simultaneous steam methane reformation reaction and biomass gasification reaction to produce reaction products.    USE - The method is useful for producing chemicals in integrated plant which is useful for producing fuel (all claimed), refining biomass, and producing fuels e.g. syngas to produce electricity which is reformed to valuable chemicals or liquid fuels.    ADVANTAGE - The method is cost-effective, enables gasification of various biomass sources e.g. lignin, corn stover and Sorghum at high temperature within seconds using solar-heated transport tube reactor, avoids tar formation, is performed in computerized control system to control feed rate of the biomass material into the multiple reactor tubes based on changing solar availability, balances gasification with amount of available concentrated solar energy, and reduces use of electricity as it uses energy for pressurizing carrier gas comes from sun.    DETAILED DESCRIPTION - Method of producing chemicals in integrated plant to produce fuel, involves (a) providing chemical reactor having multiple reactor tubes located inside cavity of thermal receiver, where simultaneous biomass gasification reaction and steam methane reforming reaction is performed by radiant heat, the simultaneous chemical reaction occurs in the multiple reactor tubes in chemical reactor, the particles of biomass are gasified in presence of steam to produce products including hydrogen and carbon monoxide gas using thermal energy from the radiant heat, the products from the biomass gasification reaction includes hydrogen and carbon monoxide gas mixed with products from the steam methane reforming reaction, and the products from both reactions are commonly passed through first input into first on-site fuel synthesis reactor which is configured to produce the fuel, (b) supplying the particles of biomass from forestry wastes, forestry thinning, or another woody source from feed system to the multiple reactor tubes, and (c) causing the simultaneous steam methane reformation reaction and biomass gasification reaction to produce reaction products including hydrogen and carbon monoxide gas using the thermal energy in the multiple reactor tubes, where the feed system, the chemical reactor, and the first on-site fuel synthesis reactor are part of the integrated plant. An INDEPENDENT CLAIM is also included for integrated plant to produce fuel.