Self-heating characteristics of coal dust deposits by a hot gas flow in oxy-fuel atmospheres

被引：16

作者：

Wu, Dejian ^{[1
]}

Norman, Frederik ^{[2
]}

Vanierschot, Maarten ^{[3
]}

Verplaetsen, Filip ^{[2
]}

Berghmans, Jan ^{[4
]}

机构：

[1] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Sichuan, Peoples R China

[2] Adinex NV, Brouwenjstr 5-3, B-2200 Noorderwijk, Belgium

[3] Katholieke Univ Leuven, Mech Engn Technol Cluster TC, Campus Grp T,A Vesaliusstr 13, B-3000 Leuven, Belgium

[4] Katholieke Univ Leuven, Dept Mech Engn, Celestijnenlaan 300A, B-3001 Heverlee, Belgium

来源：

APPLIED THERMAL ENGINEERING | 2018年 / 131卷

关键词：

Crossing point temperature; O-2/CO2; ambient; O-2; rich; Gas stream; Numerical simulation; IGNITION BEHAVIOR; MATHEMATICAL-MODEL; PULVERIZED COAL; BULK MATERIALS; COMBUSTION; ACCUMULATIONS; TEMPERATURES; PYROLYSIS; VOLUME; FIRES;

D O I：

10.1016/j.applthermaleng.2017.11.144

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Grewer oven tests with a constant heating rate are conducted to investigate the self-heating characteristics of coal dusts under air and O-2/CO2 mixtures with O-2 mole fractions ranging from 21% to 50%. Experimental results reveal that the crossing point temperature (CPT) decreases with increasing O-2 mole fraction and coal maturity. The inhibiting effect of CO2 is found to be comparatively small for the self heating process. In addition, a numerical method is developed to study the self-heating behaviour of coal dusts with an emphasis on the roles of moisture content, gas conditions, mass flow and heating rate. The kinetic parameters are estimated by a modified 2nd-order kinetic steady-state CPT method. The computational CPTs related to gas atmospheres show a good agreement with experimental results. Parameter analysis shows that the heating rate has a comparatively pronounced effect on CPTs compared to moisture content and gas flow rate. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：947 / 957

页数：11

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