(228e) Development of a Triple-Bed Combined Circulating Fluidized Bed
AIChE Annual Meeting
2019 AIChE Annual Meeting
Particle Technology Forum
Session in Honor of Prof. Atsushi Tsutsumi's Accomplishments (Invited Talks)
Monday, November 11, 2019 - 4:50pm to 5:10pm
We have developed a novel triple-bed combined circulating fluidized bed (TBCFB) gasifier which was originally proposed by Professor Atsushi Tsusumi. In this TBCFB, a downer pyrolyzer, a bubbling fluidized bed gasifier, and a riser char combustor are integrated to increase thermal efficiency of gasification at low temperatures. In this talk, we will explain 1) hydrodynamic behaviors of silica sand at very large solids circulation rate (Gs=300-500 kg/(m2 s)) in the TBCFB cold model (downer (d:0.1 m, height: 6.5 m), a bubbling fluidized bed (0.75 m×0.27 m×1.9 m), a riser (d: 0.1 m, height: 16.6 m) and a gas-sealing bed (GSB: d: 0.158 m×5 m), 2) hydrodynamics of the solids in the downer, 3) reactivity of lignite in a lab-scale downer pyrolyzer (d: 0.020 m×1 m), and 4) theoretical limit of cold gas efficiency in this TBCFB gasifier.
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