Absolute and relative emissions analysis in practical combustion systems—effect of water vapor condensation
| Autor: | Joseph C. Mollendorf, Joseph P. Richter, Paul E. DesJardin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
020209 energy
Applied Mathematics Analytical chemistry Humidity 02 engineering and technology Combustion Electrochemical gas sensor Dilution 0202 electrical engineering electronic engineering information engineering Environmental science Limiting oxygen concentration Gas composition Instrumentation Engineering (miscellaneous) Oxygen sensor Water vapor |
| Zdroj: | Measurement Science and Technology. 27:117002 |
| ISSN: | 1361-6501 0957-0233 |
| DOI: | 10.1088/0957-0233/27/11/117002 |
| Popis: | Accurate knowledge of the absolute combustion gas composition is necessary in the automotive, aircraft, processing, heating and air conditioning industries where emissions reduction is a major concern. Those industries use a variety of sensor technologies. Many of these sensors are used to analyze the gas by pumping a sample through a system of tubes to reach a remote sensor location. An inherent characteristic with this type of sampling strategy is that the mixture state changes as the sample is drawn towards the sensor. Specifically, temperature and humidity changes can be significant, resulting in a very different gas mixture at the sensor interface compared with the in situ location (water vapor dilution effect). Consequently, the gas concentrations obtained from remotely sampled gas analyzers can be significantly different than in situ values. In this study, inherent errors associated with sampled combustion gas concentration measurements are explored, and a correction methodology is presented to determine the absolute gas composition from remotely measured gas species concentrations. For in situ (wet) measurements a heated zirconium dioxide (ZrO2) oxygen sensor (Bosch LSU 4.9) is used to measure the absolute oxygen concentration. This is used to correct the remotely sampled (dry) measurements taken with an electrochemical sensor within the remote analyzer (Testo 330-2LL). In this study, such a correction is experimentally validated for a specified concentration of carbon monoxide (5020 ppmv). |
| Databáze: | OpenAIRE |
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