𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Reaction kinetics of char—CO2 gasification

✍ Scribed by Tae-Wahn Kwon; Sang D. Kim; David P.C. Fung

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
580 KB
Volume
67
Category
Article
ISSN
0016-2361

No coin nor oath required. For personal study only.

✦ Synopsis

Reaction kinetics of char-CO, gasification at atmospheric pressure were investigated in a therrnobalance reactor using four coals of different rank. Effects of coal rank (lignite to semianthracite), particle size (0.18 to 1.00 mm), reaction temperature (700 to 9OO'C) and concentration (30 to 100 ~01%) of the reactant gas (CO,) on the conversion rate of char gasification were determined. The gasification reaction order and the reaction rate constant were determined from the conversion data, and the activation energy of the reaction was determined from the Arrhenius plot. Chemical reactivity of the char was correlated with the carbon content of the parent coals, particle size, partial pressure of CO, and reaction temperature. The experimental conversion data are well represented by the unreacted shrinking core model in which chemical reaction is the rate-controlling step.

📜 SIMILAR VOLUMES

Deactivation model for textural effects
Deactivation model for textural effects of kinetics of gas-solid noncatalytic reactions “char gasification with CO2”
✍ Nail Yaşyerli̇; Timur Doǧu; Gülşen Doǧu; i̇rfan Ar 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 434 KB

Variation of the reactivity of a solid reactant due to changes in number of working active sites and pore structure was represented by a deactivatiOn model. The model was shown to give good aggreeme~ with the experimental data obtained for the gasification of chars of different lignitas. All the kin

CO2 gasification of eucalyptus wood char
CO2 gasification of eucalyptus wood chars
✍ Néstor Tancredi; Tomás Cordero; José Rodríguez-Mirasol; Juan J. Rodríguez 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 441 KB
Kinetic studies of steam gasification of
Kinetic studies of steam gasification of char in the presence of H2, CO2 and CO
✍ Heinz-Jürgen Mühlen; Karl Heinrich van Heek; Harald Jüntgen 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 608 KB

Kinetic studies have been carried out to elucidate the mechanisms of steam and CO, gasification of char and the interactions of these gasifying agents. The positive and negative influences of all product gases, excluding methane, were considered. An empirical approach was derived to describe the eff

Catalytic gasification of gas-coal char
Catalytic gasification of gas-coal char in CO2
✍ Shufen Li; Yuanlin Cheng 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 335 KB

CO, gasification of a gas-coal char catalysed by Na,C03 and K&O, was studied using a fixed-bed reactor at 79S102o"C and 0.2 MPa. The gasification rate increased with increasing temperature. With increasing addition of Na2C03 in the range 9-25 wt% and K&O, in the range 5-20 wt% the rate increased sha

Kinetic studies of a lignite char pressu
Kinetic studies of a lignite char pressurized gasification with CO2, H2 and steam
✍ Li Shufen; Sun Ruizheng 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 333 KB

This work reports a kinetic study of the pressurized gasification of a lignite char with CO,, H, and steam using a packed bed balance reactor (PBBR) system. The kinetics were studied under selected conditions in which the external and internal diffusion effects were negligible and chemical reaction