Printed book · Report
Ash tracer technique
This report describes the ash tracer technique which has been developed, used and evaluated for description of the extent of burnout for Cerrejon coal and wheat straw converted in a pressurized entrained-flow reactor. The uncertainty in the calculated extent of burnout depends on the uncertainty in the ash percentages determined for fuel and fuel sample.
The uncertainty increases with decreasing amounts of material used for the ash percent determinations, as the natural variation within the fuel and fuel sample becomes obvious. Ash percentages for the original fuels have an absolute deviation within 0.2% with a remaining ash amount of minimum 100 mg and of 2% when using thermogravimetric analysis equipment where 0.4 - 4 mg was remaining.
Repeated ash percent determinations by thermogravimetric analysis equipment of 40 samples showed an average absolute deviation of 3%. A temperature of 1000 deg. C is shown to be the best choice for the ash percent determinations in order to reduce the uncertainties. collection of representative straw samples is shown to make higher demands to the sampling procedure than collection of those for coal.
A representative sample collection is shown to be easier from combustion experiments that form gasification and pyrolysis experiments. The ash tracer technique is verified by elemental ash analyses. (au) 14 tabs., 6 refs..
Language: | English |
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Year: | 1995 |
Pages: | 21 s. |
Series: | Denmark. Forskningscenter Risoe. Risoe-r |
ISBN: | 8755021085 and 9788755021082 |
ISSN: | 01062840 |
Types: | Printed book and Report |