Diesel engines gas emissions monitored by photoacoustic spectroscopy

Abstract

In Brazil, there has been an increasing demand for power generators, driven by diesel oil and other fossil fuels, because of the lack of rain and consequent decreased availability of hydroelectric energy, leading to the rationing of energy. It is known that the combustion of diesel oil in power generators is the main source of many contaminant gases such as nitrogen oxides, SO2, CO, and hydrocarbons. In this work, we carried out a thorough analysis, using the photoacoustic technique of gas samples collected in a closed room where a power generator was turned on for 60 min to saturate the ambient. Some substances such as SO2 and NO2 were detected in the parts per million range.

Photoacoustic spectroscopy for analytical measurements

“…The extreme sensitivity was achieved by a highly sensitive cell design and a special phase-sensitive evaluation procedure. A typical application of PA spectroscopy for the measurement of traffic emissions is demonstrated by Sthel et al [88,89]. They measured NO 2 and SO 2 concentrations below 1 ppm in a local bus station in a Brazilian city.…”

Photoacoustic Spectroscopy for the Quantification of N2O in the Off-Gas of Wastewater Treatment Plants

“…Costopoulos et al used a pulsed optical parametric oscillator emitting at 2.86 μm, yielding an impressive LOD of 60 ppbv. Others used a mechanically modulated continuous-wave CO 2 -laser emitting at 10.532 μm, a semiconductor laser emitting around the N 2 O absorption band at 2.292 μm, or a quantum cascade laser (QCL). , …”

Evaluation of Gaseous Emission in the Use of Biofuels in Brazil

“…Photoacoustic spectroscopy is used for the detection of several gases in the concentration range of parts per billion by volume (ppbv) and sub-ppbv [12][13][14][15][16][17][18][19][20][21]. This methodology is based on the generation and detection of pressure waves (sound) inside a resonant cell, where the gas samples are placed.…”