COMBUSTION OF CELLULOSIC CHAR UNDER LAMINAR-FLOW CONDITIONS

被引:7
作者
SMITH, FG [1 ]
PENDARVIS, RW [1 ]
RICE, RW [1 ]
机构
[1] CLEMSON UNIV,DEPT CHEM ENGN,CLEMSON,SC 29631
关键词
D O I
10.1016/0010-2180(92)90007-C
中图分类号
O414.1 [热力学];
学科分类号
摘要
An experimental and modeling study of cellulosic char combustion under laminar gas flow conditions was conducted covering the temperature range of 473-1173 K with 0.03-0.21 oxygen mole fraction in the feed gas. A gas film mass-transport limited model accurately fits the combustion rates measured in a large-scale thermogravimetric furnace. The best fit correlation to the experimental data predicts that local mass transfer rates are governed by the relationship Sh(x) = 0.221 Re(x) 0.564Sc1/3 and that mass transfer and char combustion rates are proportional to the oxygen mole fraction in the bulk gas raised to the 0.72 power. These results were used to develop an integral reactor model for a countercurrent pilot scale incinerator. Preliminary experiments indicate good agreement between model predictions and actual incinerator behavior.
引用
收藏
页码:61 / 73
页数:13
相关论文
共 19 条
[1]  
AMUNDSON NR, 1984, IND ENG CHEM FUND, V23, P191
[2]   REACTIONS BETWEEN CARBON AND OXYGEN [J].
ARTHUR, JR .
TRANSACTIONS OF THE FARADAY SOCIETY, 1951, 47 (02) :164-178
[3]  
BIRD RB, 1960, TRANSPORT PHENOMENA, P647
[4]   GASIFICATION OF COAL-DERIVED CHARS IN SYNTHESIS GAS-MIXTURES UNDER INTRAPARTICLE MASS-TRANSFER-CONTROLLED CONDITIONS [J].
BLIEK, A ;
LONT, JC ;
VANSWAAIJ, WPM .
CHEMICAL ENGINEERING SCIENCE, 1986, 41 (07) :1895-1909
[5]  
CARNAHAN B, 1973, DIGITAL COMPUTING NU, P312
[6]   REACTIVITY OF COAL AND CHAR .2. IN OXYGEN-NITROGEN ATMOSPHERE [J].
DUTTA, S ;
WEN, CY .
INDUSTRIAL & ENGINEERING CHEMISTRY PROCESS DESIGN AND DEVELOPMENT, 1977, 16 (01) :31-37
[7]   REACTIVITY OF COAL AND CHAR .1. CARBON-DIOXIDE ATMOSPHERE [J].
DUTTA, S ;
WEN, CY ;
BELT, RJ .
INDUSTRIAL & ENGINEERING CHEMISTRY PROCESS DESIGN AND DEVELOPMENT, 1977, 16 (01) :20-30
[8]  
DUTTA S, 1978, COAL P TECHNOL, V4, P40
[9]  
ESMOOT LD, 1979, PULVERIZED COAL COMB
[10]  
EVANS JH, 1976, GAS SOLID REACTIONS, P206