Systematic evaluation of gasifiers driven by the high-enthalpy plasma supply

• Plasma energy input has become the third dimension of 2D autothermal gasification. • New unique gasifier designs were made possible by plasma integration. • The best performance system reached a carbon conversion rate of 100% and a cold gas efficiency of 88%. • 4 industrial and pilot scale gasifiers exceeded a throughput of 300 kg/h. The study overviews gasifiers driven by thermal and microwave plasma which primarily produce hydrogen and carbon monoxide. Industrially available plasma generation methods are described. Analysis of plasma gasification systems revealed eight distinct designs and their features. Counter current systems matured to industrial scale (up to 7000 kg/h of municipal solid waste), though tar cracking is not forced by plasma integration. The cold gas efficiency (∼61%) is similar to the autothermal industrial systems. Cross current systems reached technology readiness levels of 4–5 (up to 60 kg/h) but require long-term testing for stationary state balancing. In co-current downdraft systems wood and low-ash, plastic-rich municipal solid waste were processed (10 kWh/kg). The furnace-like designs, which have a throughput of up to 437 kg/h, also suffer from arc instabilities resulting in energy consumptions of > 4 kWh/kg due to a poor energy distribution. A counter current design was determined to be the most mature one, while horizontal co-current designs promise better performance.