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High Quality Syngas Production with Supercritical Biomass Gasification Integrated with a Water-Gas Shift Reactor


M. M. Sarafraz, Mohammad Reza Safaei*, M. Jafarian, Marjan Goodarzi*, M. Arjomandi

Source title: 
Energies, 2019 (ISI)
Academic year of acceptance: 

A thermodynamic assessment is conducted for a new configuration of a supercritical water gasification plant with a water–gas shift reactor. The proposed configuration offers the potential for the production of syngas at different H 2 :CO ratios for various applications such as the Fischer–Tropsch process or fuel cells, and it is a path for addressing the common challenges associated with conventional gasification plants such as nitrogen dilution and ash separation. The proposed concept consists of two reactors, R 1 and R 2 , where the carbon containing fuel is gasified (in reactor R 1 ) and in reactor R 2 , the quality of the syngas (H 2 :CO ratio) is substantially improved. Reactor R 1 is a supercritical water gasifier and reactor R 2 is a water–gas shift reactor. The proposed concept was modelled using the Gibbs minimization method with HSC chemistry software. Our results show that the supercritical water to fuel ratio (SCW/C) is a key parameter for determining the quality of syngas (molar ratio of H 2 :CO) and the carbon conversion reaches 100%, when the SWC/C ratio ranges between two and 2.5 at 500–1000 °C.