Abstract
It has been customary, when measuring the gasification rate of black liquor char, to add CO during the preceding temperature equilibration period in order to suppress the loss of sodium by the char before gasification is started.
The present study shows that this hot treatment before gasification leads to a reduction in the pressurized CO 2 gasification rate data. It is proposed that a thin layer of soot, deposited during the hot pretreatment, reduces the catalytic activity of sodium sites for carbon gasification by CO 2a. Surprisingly, the pressurized hot treatment has no effect on the pressurized H 2O gasification rate.
Atmospheric hot treatment has also no effect on the gasification rate. New high-pressure CO 2 gasification rate data are presented for fast pyrolysis black liquor char which has not been subjected to the hot treatment.
The present study shows that this hot treatment before gasification leads to a reduction in the pressurized CO 2 gasification rate data. It is proposed that a thin layer of soot, deposited during the hot pretreatment, reduces the catalytic activity of sodium sites for carbon gasification by CO 2a. Surprisingly, the pressurized hot treatment has no effect on the pressurized H 2O gasification rate.
Atmospheric hot treatment has also no effect on the gasification rate. New high-pressure CO 2 gasification rate data are presented for fast pyrolysis black liquor char which has not been subjected to the hot treatment.
| Original language | English |
|---|---|
| Pages (from-to) | 231-236 |
| Journal | Journal of Pulp and Paper Science |
| Volume | 24 |
| Issue number | 7 |
| Publication status | Published - 1998 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- gasification
