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ECN publication
The behaviour of carbonates in a simulated coal-flame
Published by: Publication date:
ECN 1995
ECN report number: Document type:
ECN-RX--95-036 Other
Number of pages: Full text:
21 Download PDF  

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.

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