PRAGA is a full equipped gasification plant based on a 200 kWth updraft gasifier which was installed in June 2010 to test the co-gasification of biomass and sorted (plastic) MSW. The nominal input of the gasifier is 30-40 kg/h of feed with a maximum plastic content of 15%. The plant is operated slightly above atmospheric conditions and it use a mix air/steam as gasification medium introduced under a moving grate at the bottom of the gasifier. The produced gas (roughly 80 Nm3/h) moves upward from the bottom of the gasifier while the biomass particles travels downwards progressively trough zones of drying, pyrolysis, reduction and combustion.
The gas cleaning section is composed by a biodiesel scrubber and two coalescer filters in series. By organic scrubbing, most of the organic and inorganic compounds (tars, HCl, etc.) are removed from the gas, while in the coalescer filters the oil drag particles would be removed. This unit also allows a temperature reduction of the syngas coming out from the gasifier (about 300-400 °C). After the cleaning the gas is destined to a flare or to a hydrogen enrichment section.