Time-resolved particle temperature and mass loss measurements of a bituminous coal during devolatilization

✍ Scribed by Thomas H. Fletcher

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 981 KB
• Volume: 78
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(89)90127-2

✦ Synopsis

Time-resolved measurements of the rate of devolatilization of high volatile bituminous coal particles in nitrogen at gas temperatures of 1050 and 1250 K are presented. Size fractions studied here are 63-75 and 106-125 tzm in diameter, with particle heating rates approaching 104 K/s. Particle samples are collected in a helium-quench probe, and a multielement tracer technique is used to determine overall mass loss due to devolatilization. An in situ method is used for simultaneously measuring the size, temperature, and velocity of individual coal particles during pyrolysis. The particle temperature measurement is performed using infrared pyrometry at wavelengths of 1.3 and 2.2 ttm. The minimum detection threshold for a 100-~m particle in this system is 850 K. The measured particle temperature history is combined with the mass loss determinations in order to study overall coal devolatilization rates. Experimentally determined coal devolatilization rates obtained using this facility are compared with published engineering kinetic models. One-step Arrhenius kinetic coefficients indicated