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Titel:
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Behavior of iron bearing minerals in the early stages of pulverized coalconversion processes
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
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1996
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ECN publicatienummer:
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Publicatie type:
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ECN-RX--95-070
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Overig
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Aantal pagina's:
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Volledige tekst:
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25
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Niet beschikbaar.
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Samenvatting:
Early stage transformations and deposition of iron bearing coal minerals,in particular pyrite (FeS2) were studied. An atmospheric lab-scale facility
was used to simulate the near burner environments in two different coal
conversion processes: (1) Low-NOx pulverized fuel combustion, and (2)
Entrained-flow gasification. Particle sampling showed that for both
environments the pyrite was transformed quickly to pyrrhotite (FeS). In the
deposition experiments this pyrrhotite impacts on the substrates. In the
deposition experiments, the chemical composition and the morphology of the
slags formed under the two conditions showed clear differences. Special
attention was payed to the role of sulphur. Based on these (preliminary)
experiments, a mechanistic model is proposed for the transformations of
pyrite in both pulverized coal conversion systems. Furthermore, a description
is given of a new experimental setup for future work at elevated pressures
(up to 20 bar) to enable a closer simulation of pressurized entrained-flow
coal gasification processes. 6 figs., 2 tabs., 6 refs.
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