High temperature air-blown woody biomass gasification model for the estimation of an entrained down-flow gasifier.
A high temperature air-blown gasification model for woody biomass is developed based on an air-blown gasification experiment. A high temperature air-blown gasification experiment on woody biomass in an entrained down-flow gasifier is carried out, and then the simple gasification model is developed based on the experimental results. In the experiment, air-blown gasification is conducted to demonstrate the behavior of this process. Pulverized wood is used as the gasification fuel, which is injected directly into the entrained down-flow gasifier by the pulverized wood banner. The pulverized wood is sieved through 60 mesh and supplied at rates of 19 and 27kg/h. The oxygen-carbon molar ratio (O/C) is employed as the operational condition instead of the air ratio. The maximum temperature achievable is over 1400K when the O/C is from 1.26 to 1.84. The results show that the gas composition is followed by the CO-shift reaction equilibrium. Therefore, the air-blown gasification model is developed based on the CO-shift reaction equilibrium. The simple gasification model agrees well with the experimental results. From calculations in large-scale units, the cold gas is able to achieve 80% efficiency in the air-blown gasification, when the woody biomass feedrate is over 1000kg/h and input air temperature is 700K.
Kobayashi
Nobusuke
N
Department of Chemical Engineering, Nagoya University, Nagoya 464-8603, Japan. Nsuke@nuce.nagoya-u.ac.jp
Tanaka
Miku
M
Piao
Guilin
G
Kobayashi
Jun
J
Hatano
Shigenobu
S
Itaya
Yoshinori
Y
Mori
Shigekatsu
S
D000388:Air; D001674:Bioelectric Energy Sources; D018533:Biomass; D004867:Equipment Design; D017022:Flow Injection Analysis; D005740:Gases / Q000737:chemistry*; D017745:Incineration / Q000295:instrumentation* / Q000379:methods*; D008962:Models, Theoretical; D014934:Wood
D005740:Gases