[Gasification] Pine char gasification with CO2

[Tom Miles]

 Crispin Pemberton-Pigott (SA) found this interesting paper on char
gasification:

http://www.purdue.edu/newsroom/releases/2013/Q4/researchers-show-potential-b
enefits-of-pinewood-char-as-synthetic-fuel-source.html

Experimental and Modeling Study of Pinewood Char Gasification with CO2

Indraneel Sircar(a*), Anup Sane(a), Weicho Wang(a), Jay P. Gore(b)

(a) Purdue University, School of Mechanical Engineering, Maurice J. Zucrow
Laboratories, 500 Allison Road, Chaffee Hall, West Lafayette, IN 47907-2014;
and (b) Reilly University Chair Professor of Engineering, School of
Mechanical Engineering with courtesy appointments in the School of
Aeronautics and Astronautics and in the School of Chemical Engineering,
Purdue University, West Lafayette, IN 47907-2014.

The objective of this study is to measure apparent rate parameters for
pinewood char gasification with CO2 using large particles with relevance to
practical gasifiers. The novel features of this work include: (1) char
gasification for CO2 recycling, which is studied less in the past than char
gasification in other environments, (2) independent measurements involving
gravimetric analyses and product gas composition gas chromatography, (3)
detailed uncertainty analyses of both methods to report resulting
uncertainties in kinetic rate constants, and (4) investigation of the char
structure development and its role in gasification. A fixed-bed reactor
providing a slip-velocity of 0.12 m/s gasifier and control of the bed
temperature to within ±10 K at 1000–1170 K is used. A low-ash (<0.01 wt.%)
pinewood char is selected to minimize the catalytic effects of ash on
mass-loss rates. The char is prepared by heating pinewood sawdust in an
electrical furnace to a temperature of 1100 K. Gravimetric and product gas
composition data are interpreted using the volumetric, non-reactive core and
random pore models. The results show that the activation energies
corresponding to these models are 217 ± 6, 186 ± 13, 125 ± 30 kJ/mol,
respectively. The random pore model shows the closest agreement with the
experimental data, despite the uncertainties in the measured activation
energies. The estimated random pore model structure parameter W increases
from 0 to 16.5 with increases in the gasification temperature. Measurements
of BET surface area show significant increase with char conversion. The
results of this study show that the apparent gasification rate parameters
for relatively large particles of practical relevance are comparable to
those obtained from laboratory studies with much smaller particles.

http://www.sciencedirect.com/science/article/pii/S0016236113010727 

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