|
Title:
|
|
The behaviour of carbonates in a simulated coal-flame
|
|
|
|
Author(s):
|
|
|
|
|
|
Published by:
|
Publication date:
|
|
ECN
|
1995
|
|
|
|
ECN report number:
|
Document type:
|
|
ECN-RX--95-036
|
Other
|
|
|
|
Number of pages:
|
Full text:
|
|
21
|
Download PDF
|
Abstract:
The flame-behaviour of the most important carbonates in European importcoals has been investigated. The study was performed in a laboratory facility
in which the environment of a coal-burner was simulated. Electron microscopy
was used for the determination of size and morphology of the particles
sampled from the flame. The viscosity of the particles was derived from tests
of their adherence to refractory deposit plates placed in the flame. Calcite
(CaCO3) particles of 60 micrometer, a typical size in pulverized coal, broke
up into fragments with approximately a ten times smaller size. The time for
completion of the fragmentation corresponded to the time calculated for
decomposition of the calcite. Of the 'siderite' samples tested none showed
fragmentation. Detailed analyses with TG-MS (Thermo-Gravimetry coupled with
Mass Spectrometry) were performed to determine the actual fraction of FeCO3
in 'siderite' samples. Flame-products of siderite proper had a high
viscosity. Siderite particles with imbedded silicates had flame-products of
low-viscosity. Ankerite (CaFe(CO3)2) did not fragment and the flame-product
was fluid. 5 figs., 12 refs.
Back to List