In order to describe the combustion of solid fuels precisely, the changing heating value and oxygen requirement of the evolved volatiles has to be known. However, the main component of the volatiles is tar, which is a complex mixture of hydrocarbons and still incomplete to analyse. A newly developed flow-calorimeter enables the determination of heating value and oxygen requirement of all volatiles including tar as function of time. To gain the data, volatiles are produced from heating a fuel particle in a thermogravimetric analyser. Inside the flow-calorimeter the volatiles are mixed with air and completely burnt at a monolithic honeycomb-catalyst. The increase in temperature of the exhaust gases corresponds to the heat of reaction. The heating value of the volatiles as a function of time results from the heat of reaction divided by the mass loss rate of the fuel particle. The oxygen consumed during combustion represents the stoichiometric oxygen requirement of the volatiles.
|Effective start/end date||1/01/99 → 31/01/03|