COMBUSTION RATES OF PULVERIZED COAL PARTICLES IN HIGH-TEMPERATURE HIGH-OXYGEN CONCENTRATION ATMOSPHERE

被引：26

作者：

SAITO, M ^{[1
]}

SADAKATA, M ^{[1
]}

SATO, M ^{[1
]}

SOUTOME, T ^{[1
]}

MURATA, H ^{[1
]}

OHNO, Y ^{[1
]}

机构：

[1] NIPPON KOKAN KK,KAWASAKI KU,KAWASAKI 210,JAPAN

来源：

COMBUSTION AND FLAME | 1991年 / 87卷 / 01期

关键词：

D O I：

10.1016/0010-2180(91)90022-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Combustion characteristics of pulverized coal particles at particle temperatures over 1800-degrees-C and oxygen concentration of 40%-80% were investigated using a high-temperature drop furnace. The results demonstrate that the ignition delay time and burnout time are less than 10 and 50 ms, respectively, in the case of combustion under a high-temperature/high-oxygen concentration atmosphere. It was found that the char combustion rate was controlled by gas film diffusion, and the apparent activation energy was about 8.4 kJ/mol. Also, the rotation of pulverized coal particles was observed during early-stage of combustion and the rotation frequency reached 3000-5000 cycles/s. The combustion rate of volatile matter was remarkably increased within the range of particle temperature over 2100-degrees-C. The apparent activation energy of the combustion rate of volatile matter was increased with increasing particle temperature and oxygen concentration. The value of activation energy changed from 109.2 kJ/mol for particle temperature 1800-2100-degrees-C and oxygen concentration 40%-50% to 336 kJ/mol for particle temperature over 2500-degrees-C and oxygen concentration 70%-80%.

引用

页码：1 / 12

页数：12

共 19 条

[1] Effects of Soot on Pyrometer Measured Temperatures in Pulverized-Coal Flames [J].