Abstract
Abstract In situ LIF measurements of PAC concentrations were made in fuel rich natural gas flames, in the semi industrial scale MIT Combustion Research Facility. LIF measurements had been made in the past, but LIF had not been applied for monitoring of industrial scale combustion systems. An argon ion laser, operated at 488 nm, and narrow angle detection optics, were employed for the LIF experiments. The LIF emission spectra obtained, were found to be similar for the various flames tested. A correlation was established, between the LIF signal intensity and the concentration of PACs, determined by chemical analysis of physical samples from the flames. Measurements of pure PACs in the gas phase at elevated temperatures in nitrogen, using a batch cell, showed that the LIF emission is strongest from high molecular weight PACs (e.g. coronene), and that their fluorescence emission spectra are similar to those from flames.
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