Analysis of the combustion kinetics and thermal behavior of an intumescent system

被引:65
作者
Branca, C
Di Blasi, C [1 ]
Horacek, H
机构
[1] Univ Naples Federico II, Dipartimento Ingn Chim, I-80125 Naples, Italy
[2] Intumex Brandschutzprod GmbH, A-4021 Linz, Austria
关键词
D O I
10.1021/ie010841u
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The combustion kinetics of a laminate with intumescent behavior were determined by thermogravimetry for heating rates between 5 and 20 K/min and a final temperature of 873 K. The devolatilization stage consists of three consecutive first-order reactions that can be associated with the release of (1) water vapor (from aluminum trihydrate), (2) HCl (from polychloroprene), and (3) a gaseous mixture (from expansible graphite), followed by charring. The corresponding activation energies are 114, 140, and 83 kJ/mol. The second stage is the heterogeneous combustion of the active part of the intumescent char. This process is described by a one-step reaction whose rate presents a power-law dependence (n = 1.98) on the solid conversion and an activation energy of 182 kJ/mol. The thermal response of a composite system that uses the intumescent material as a coating for thin steel slabs was also investigated. For external temperatures of 625-1025 K, the sequential chemico-physical changes undergone by the intumescent coating highly affect the dynamics of steel heating.
引用
收藏
页码:2107 / 2114
页数:8
相关论文
共 30 条
[1]   A THERMODYNAMIC HEAT-TRANSFER MODEL FOR INTUMESCENT SYSTEMS [J].
ANDERSON, CE ;
WAUTERS, DK .
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE, 1984, 22 (07) :881-889
[2]  
[Anonymous], 1988, Optimization of chemical processes
[3]   CELLULOSE PYROLYSIS KINETICS - THE CURRENT STATE KNOWLEDGE [J].
ANTAL, MJ ;
VARHEGYI, G .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1995, 34 (03) :703-717
[4]   Dehydrochlorination of plastic mixtures [J].
Bockhorn, H ;
Hornung, A ;
Hornung, U ;
Jakobströer, P ;
Kraus, M .
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, 1999, 49 (1-2) :97-106
[5]  
BUZZIFERRARIS G, 1968, QUAD ING CHIM ITAL, V4, P171
[6]  
Cagliostro D.E., 1975, Journal of Fire and Flammability, V6, P205
[7]   COMPENSATION EFFECT IN THE THERMAL-DECOMPOSITION OF CELLULOSIC MATERIALS [J].
CHORNET, E ;
ROY, C .
THERMOCHIMICA ACTA, 1980, 35 (03) :389-393
[8]   Comments on the validity and utility of the different methods for kinetic analysis of thermogravimetric data [J].
Conesa, JA ;
Marcilla, A ;
Caballero, JA ;
Font, R .
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, 2001, 58 :617-633
[9]   Reactivities of some biomass chars in air [J].
Di Blasi, C ;
Buonanno, F ;
Branca, C .
CARBON, 1999, 37 (08) :1227-1238
[10]   Mathematical model for the nonsteady decomposition of intumescent coatings [J].
Di Blasi, C ;
Branca, C .
AICHE JOURNAL, 2001, 47 (10) :2359-2370