Synergistic effects during co-pyrolysis and liquefaction of biomass and lignite under syngas

Abstract

The liquefaction and pyrolysis, co-liquefaction and co-pyrolysis of biomass and its three components (cellulose, hemicellulose, and lignin) with lignite under syngas were conducted, and the synergistic effects during co-liquefaction and co-pyrolysis of coal and biomass or its three components are investigated. The results show that the liquefaction of them can be conducted under mild reaction condition. The total conversion and the yield of asphaltene and preasphaltene (PA + A) increase with the addition of sawdust or cellulose to lignite, but the oil yields decrease when sawdust or cellulose is added to lignite during liquefaction. On the other hand, only oil yield observably increases with the addition of lignin to lignite. Sawdust and the three components of biomass promote the decomposition of lignite, resulting in the appearances of synergistic effects during co-pyrolysis of them. The final mass loss differences between calculation and experiment profiles during co-pyrolysis of lignite and biomass’ three components follow the order of coal and cellulose > coal and hemicellulose > coal and lignin. The extent of the synergistic effects during co-pyrolysis may be affected by the release of volatile matter.