Fu, Y
1992
Structure/Reactivity Studies of Single Coal Particles at Very High Heating Rates by Laser Pyrolysis GC/MS
Maswadeh, W.; Fu, Y.; Dubow, J. and Meuzelaar, H.L.C.
ACS Division of Fuel Chemistry Preprints, 37(1):699-706, 1992 (203rd ACS National Meeting, San Francisco, CA, April 1992). Funded by ACERC.
Recently, Maswadeh et al. reported on the design, construction and testing of a single particle levitation/laser devolatilization apparatus featuring an on-line gas chromatograph/mass spectrometer (GC/MS) system, enabling coal devolatilization experiments of heating rates in the 10-5-106 K/s range. Analysis of bituminous coal particles revealed a high degree of qualitative correspondence with pyrolysis patterns obtained at much slower (10-2-100 K/s range) TG/MS heating rates, thus providing mechanistic justification for extrapolating kinetic parameters obtained by slow pyrolysis techniques (e.g., TG/MS and TG/IR) to the high heating rates characteristic of full scale, suspension fired coal combustors.
A second observation made with the aid of laser pyrolysis GC/MS was that the distribution of devolatilization products observed at very high heating rates was not measurably influenced by the presence or absence of air. A subsequent redesign of the system permitted the use of electron microscopy (EM) grids to support individual coal particles, thereby simplifying the experimental set up, improving collection efficiency of volatile products and facilitating optical alignment of the particles (microscopy, optical micropyrometry) as well as retrieval of residual char particles.
Fu, Y
1992
Structure/Reactivity Studies of Single Coal Particles at Very High Heating Rates by Laser Pyrolysis GC/MS
Maswadeh, W.; Fu, Y.; Dubow, J. and Meuzelaar, H.L.C.
ACS Division of Fuel Chemistry Preprints, 37(1):699-706, 1992 (203rd ACS National Meeting, San Francisco, CA, April 1992). Funded by ACERC.
Recently, Maswadeh et al. reported on the design, construction and testing of a single particle levitation/laser devolatilization apparatus featuring an on-line gas chromatograph/mass spectrometer (GC/MS) system, enabling coal devolatilization experiments of heating rates in the 10-5-106 K/s range. Analysis of bituminous coal particles revealed a high degree of qualitative correspondence with pyrolysis patterns obtained at much slower (10-2-100 K/s range) TG/MS heating rates, thus providing mechanistic justification for extrapolating kinetic parameters obtained by slow pyrolysis techniques (e.g., TG/MS and TG/IR) to the high heating rates characteristic of full scale, suspension fired coal combustors.
A second observation made with the aid of laser pyrolysis GC/MS was that the distribution of devolatilization products observed at very high heating rates was not measurably influenced by the presence or absence of air. A subsequent redesign of the system permitted the use of electron microscopy (EM) grids to support individual coal particles, thereby simplifying the experimental set up, improving collection efficiency of volatile products and facilitating optical alignment of the particles (microscopy, optical micropyrometry) as well as retrieval of residual char particles.