The RENUGAS process was developed by the Institute of Gas Technology (Evans et ah, 1987; Trenka et ah, 1991; Trenka, 1996). After tests in a 9.1-t/ day PDU, a demonstration plant for 91 t/day of wood or 63 t/d of bagasse feedstock was constructed by the Pacific International Center for High Technol­ogy Research in Hawaii at the Hawaiian Commerce and Sugar Company. Bagasse, whole-tree chips, and possibly RDF are being tested in this plant. The gasifier has an inside diameter of about 1.2 m and is fed by a lockhopper and a live-bottom feed hopper. The development work was done in a 0.3-m inside diameter, 9.1-t/day PDU, so the scale-up factor is less than 10. For 92 to 96% carbon conversion, the oxygen requirement ranges from 0.24 to 0.34 kg/kg of wood feed, the dry fuel gas yield ranges from 1 to 1.2 m3/kg of wood feed, and the heating value of the gas is about 11.8 to 13.5 MJ/m3 (n). A typical run with whole-tree chips consisted of a feed rate of 321 kg/h with wood containing 9 wt % moisture, 0.69 kg of steam/kg of wood, 0.26 kg of oxygen as air/kg of wood, and gasification at 910°C and 2189 kPa. The heating value of the raw gas on a dry, nitrogen-free basis was 13.6 MJ/m3 (n) and contained 16 mol % carbon monoxide, 38 mol % carbon dioxide, 17 mol % methane, 1 mol % higher hydrocarbons, and 28 mol % hydrogen. The yield of this gas was 1.04 m3 (n)/kg of wood (wet). This plant is being operated at pressures up to 2027 kPa over a range of steam/oxygen ratios. The objectives are to demonstrate medium-energy gas production for power generation, hot — gas cleanup, and synthesis gas production. A special system for gas cleanup is being tested in both the 9.1-t/day PDU and the 91-t/day plant (Wiant et al, 1993).