Devolatilization of large coal particles at high pressure

✍ Scribed by Craig N. Eatough; L. Douglas Smoot

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 697 KB
• Volume: 75
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(96)00128-7

✦ Synopsis

Devolatilization times of large (0.1 and 0.2 g) Utah hvBb and North Dakota lignite coal particles, in the range 15-30s were measured in air at 101 and 507 kPa, at air temperatures of 900 and 1200K in a convective flow reactor. Visual observations indicated infrequent heterogeneous ignition of the lignite prior to devolatilization and occasional explosion of bituminous coal particles during devolatilization. Devolatilization times were correlated with temperature, pressure and particle size. Power-law exponents for tests at 101 kPa and 900K were determined to be 2.5 for Utah hvBb coal and 2.2 for North Dakota lignite. At 507 kPa and 900 K, exponents decreased to 1.6 for both Utah and North Dakota coals. At 101 kPa and 1200 K, exponents were 1.9 for Utah coal and 1.6 for North Dakota lignite.