Thermal treatment and foaming of chars obtained from almond shells:: kinetic study

被引：20

作者：

Marcilla, A ^{[1
]}

Conesa, JA ^{[1
]}

Asensio, M ^{[1
]}

García-García, SM ^{[1
]}

机构：

[1] Univ Alicante, Dept Chem Engn, E-03080 Alicante, Spain

来源：

FUEL | 2000年 / 79卷 / 07期

关键词：

carbonization; almond shell; cellulose; lignin; kinetics;

D O I：

10.1016/S0016-2361(99)00206-9

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The influence of a combined thermal treatment on the density of chars obtained from almond shells has been investigated. The thermal treatment involves two steps at different heating rates: the first one up to temperatures of 225-400 degrees C; and the second one up to 850 degrees C. Thermogravimetric experiments have been carried out with the intermediate chars obtained after treatment revealing the evolution of the different fractions of the almond shells (i.e. hemicellulose, cellulose and lignin), and their influence on the final density of the chars. An intermediate treatment, where the gases evolved from the last remaining fractions of the cellulose coincide with the char in a fluid or soft state, is required to foam the particles. A kinetic model has been applied to quantify, with excellent results, the evolution of the different fractions. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：829 / 836

页数：8

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