NOVELTY - Renewable feedstocks and/or residual gases from the following process, are gasified with steam addition, in allothermic reaction. A pulsed combustor is used. The gas is purified and cooled. The gas is pressurized in stages for the following processes. The water gas shift reaction converts CO to H2. The H2/CO ratio of the raw synthesis gas is matched with the requirements of the following stages of gas purification, removal of trace materials and catalysis (especially with reference to preventing catalyst poisoning).    USE - To produce energy, fuel and chemical raw materials using carbon dioxide- neutral feedstocks. One or more of the products is used to drive a marine engine (claimed).    ADVANTAGE - The known SPOT process is used, in which an inert fluidized bed is supplied with the carbon dioxide-neutral feedstock and heated by pulsed burners. Temperatures and reaction processes are thoroughly-distributed in the bed; there are no highly-localized temperature- or reaction zones. The bed operates at 800 degrees C under little pressure (0.5 bar maximum). Technical problems are therefore minimal. Nevertheless, high efficiency is achieved. Capital costs are reduced. Based on synthesis gas, 100t of biomass is converted to 23t of high quality fuel.    DETAILED DESCRIPTION - The Rectisol (RTM; Lurgi methanol-based purification) process is used, for example. Methanol synthesis produces fuel and raw material for chemical products. Fischer-Tropsch synthesis is used; the products being converted to fuel. H2 is produced, based on biosynthesis gas. Ammonia is produced from the biosynthesis H2. Ammonia is converted by CO2 addition, to urea and other products. The hydrogen is used in fuel cells to generate electricity. Waste heat is utilized in a steam turbine. Gas purification is mechanical; it optionally includes fine dust removal. Gas quenching takes place. Gas cooling is combined with removal of condensable traces in the bio-synthesis gas. Electrical energy is generated by combustion of bio-synthesis gas. One or more of the following approaches is used. The gas is burned in a gas turbine combustion chamber. Waste heat is utilized. The gas is burned in combined heat and power (CHP) cycles, where electrical power and useful heat are produced. The gas is burned in gas engines, to produce mechanical energy, e.g. for driving ships. Electrical power is produced using internal combustion engines. Residual heat from the exhaust gases is exploited by a subsequent steam turbine process.    DESCRIPTION OF DRAWING(S) - The drawing shows a simplified block schematic flow diagram of a process implementation.(Drawing includes non-English language text)