An oral presentation at the 16th International Conference on Combustion Technologies for a Clean Environment at Instituto Superior Técnico, Lisbon, Portugal, from May 25 to 29, 2025. A pilot plant is developed for the NET-Fuels project. The imperative is the treatment of pyrolysis gases to significantly reduce gas components which are harmful to the downstream system, namely H2S and NH3. This is by means of a venturi and packed bed countercurrent gas scrubber to remove NH3, followed downstream by FeO(OH) fixed bed reactors to remove H2S. The treated gas is then pressurized to 30 barg and condensed at a temperature of 3°C, before puffering at a reduced pressure as dry gas. H2 is then extracted from the pressurized gas with vacuum pressure swing adsorption through columns filled with activated carbon and zeolites. Thereafter, the gas is combusted with O2 and dried over dessicant to form a concentrated 98% CO2 product stream suitable for use in a Bio-Electrochemical Methanation plant. Design of the mass balances of the components in the system, as well as process design of the fixed bed reactors are in python. The saturation pressures and condensation of the pressurized gas are calculated in DWSIM. The system is unique by turning the gaseous phase of the pyrolyzed biogenic feedstock into advanced biofuels without any direct CO2 emissions from the pyrolysis process.
Groves et al. (Wed,) studied this question.