NOVELTY - An integrated plant has steam explosion unit (108) having input cavity to receive biomass as a feedstock, steam supply inputs, and stages to pre-treat the biomass for supply to a biomass gasifier (114). Heat, pressure and/or moisture are applied to the biomass in the stages, biomass is broken by steam explosion process, steam from steam supply input (A) for degrading bonds between lignin and hemi-cellulose from cellulose fibers of the biomass is applied, and steam from steam supply input (B) is applied to heat and pressurize gases and fluids in the biomass by rapid depressurization.    USE - Integrated plant is used for production of syngas (claimed).    ADVANTAGE - The syngas is economically and efficiently produced using the integrated plant, by a simple process.    DETAILED DESCRIPTION - An integrated plant has steam explosion unit having input cavity to receive biomass as a feedstock, steam supply inputs, and stages to pre-treat the biomass for subsequent supply to a biomass gasifier. Heat, pressure and/or moisture are applied to the biomass in the stages, bulk structure of the received biomass is broken by steam explosion process, steam from a steam supply input (A) for degrading bonds between lignin and hemi-cellulose from cellulose fibers of the biomass is applied, moisture content of the received biomass is increased, stages steam ten times or more than the atmospheric pressure from steam supply input (B) is applied to heat and pressurize gases and fluids in the biomass to internally blow apart the bulk structure of the received biomass by rapid depressurization of the biomass with the increased moisture content and degraded bonds, to produce biomass into the moist fine particles (453) form from the stages, and the produced moist fine particles of biomass are subsequently fed to a feed section of the biomass gasifier. The biomass gasifier has reactor vessel configured to react the biomass in moist fine particle form with a decreased particle size and an overall increase in surface area due to being blown apart by the steam explosion unit, third steam supply input and heat sources, and in the presence of the steam the biomass in fine particle form is reacted in the reactor vessel in a rapid biomass gasification reaction to produce at least syngas components, including hydrogen and carbon monoxide. The moist fine particles of biomass have average dimensions of less than 70 mu m thick and less than 500 mu m in length. An INDEPENDENT CLAIM is included for production of syngas.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of pretreatment of biomass in the integrated plant.    Chipping unit (104)    Steam explosion unit (108)    Biomass gasifier (114)    Chip of biomass (451)    Fine particles of biomass (453)