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REAL-TIME EMISSION CHARACTERIZATION OF ORGANIC AIR TOXIC POLLUTANTS DURING STEADY STATE AND TRANSIENT OPERATION OF A MEDIUM DUTY DIESEL ENGINE
Citation:
GULLETT, B. K., A. TOUATI, L. OUDEJANS, AND S. P. RYAN. REAL-TIME EMISSION CHARACTERIZATION OF ORGANIC AIR TOXIC POLLUTANTS DURING STEADY STATE AND TRANSIENT OPERATION OF A MEDIUM DUTY DIESEL ENGINE. doi:10.1016/j.atmose, P. Brimblecombe, H. Singh (ed.), ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 40(22):4037-4047, (2006).
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to publish information
Description:
An on-line monitoring method, jet resonance-enhanced multi-photon ionization (REMPI) with time-of-flight mass spectrometry (TOFMS) was used to measure emissions of organic air toxics from a medium-duty (60 kW)diesel generator during transient and steady state operations. Emissions of gas phase benzene, toluene, ethylbenzene, o-. M-, p-xylenes (BTEX), styrene, and polycyclic aromatic hydrocarbons (PAHs) were measured at levels in the 10-500 ppb range with a measurement frequency of 10 per second; this enabled rapid emission characterization as a function of operating conditions: cold starts, hot starts, and load change. The sensitivity, selectivity and real time monitoring capabilities of the jet REMPI-TOFMS system discerned transient concentration of organic air toxics (for example, benzene and napthalene) during cold starts exceeding 15 times their steady state levels. Time integrated concentrations obtained by jet REMPPI-TOFMS compared well with standard EPA methods. The jet REMPI-TOFMS system provides a means to rapidly characterize air toxic emission factors that enables users to alter operational procedures to minimize air toxic formation. The relative concentrations between startus and steady state emissions, as well as the transition period between levels, were specific for each type of compound found in the diesel exhaust.
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REAL-TIME EMISSION CHARACTERIZATION OF ORGANIC AIR TOXIC POLLUTANTS DURING STEADY STATE AND TRANSIENT OPERATION OF A MEDIUM DUTY DIESEL ENGINE