二塔式ガス化炉で発生したガスの組成: 木質バイ才マスと褐炭の比較

摘要

Wood pellets were steam-gasified by using the bench-scale dual fluidized bed gasifier (DFBG). The composition of volatile compounds in the effluent gas from the gasifier is compared with that for lignite. The major components for wood were CO, H_2 and hydrocarbons which result mainly from pyrolysis, whereas H_2 and CO2, which are produced by steam gasification and water-shift reaction, were major components for lignite. For wood, 57% of carbon in volatile compounds originates from pyrolysis, to be compared with 27% for lignite.The results of experiment and numerical calculation suggest that secondary pyrolysis of tar components proceeds in the free-board and that tar components are steam-reformed.%ベンチスケール二塔式ガス化炉を用いて木質バイォマスをガス化し，ガス化炉発生ガスの組成を褐炭の場合と比較した。木質バイオマスではCOおよび炭化水素の濃度が高く主に熱分解ガス由来であり，一方，褐炭ではH_2およびCO_2の濃度が高くなり水蒸気ガス化および水性シフト反応由来のガスが主である。