OCR Text |
Show The Surrogate Problem • emissions-control of multitude of (hazardous) organic air pollutants required • use surrogate(s) for diagnosis and monitoring, • requirements of a surrogate compound : mechanistically related to (other) trace combustibles, refractory to combustion, detectable In trace concentrations, detectable by fast measurement. • CO alone Is Inadequate PACs as a Surrogate • present In effluent of diffusion flames, • highly refractory, stable, • measurable by laser Induced fluorescence (UF), ~ • some PACs represent health hazards (U.S. CAA 1990, sec 112, § b) CttI"l Y\ {) O~ The MIT LIF Monitoring System • In-situ measurement In an Industrial environment, • measures sum of PACs In real time, • detection limit: 10 ppb, • measurement In flame or flue gas, • industrial demonstration in progress (Stadtwerke Dusseldorf) Research Objectives • use LIF and CO concentration measurements as surrogates for trace combustible emissions, • correlate concentrations of trace combustibles (flame and flue gas samples) with LIF and CO • use UF to study destruction of PACs |