ECN publication
Behavior of iron bearing minerals in the early stages of pulverized coalconversion processes
Published by: Publication date:
ECN 1996
ECN report number: Document type:
ECN-RX--95-070 Other
Number of pages: Full text:
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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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