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J. Sens. Sens. Syst., 7, 161-167, 2018
https://doi.org/10.5194/jsss-7-161-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
22 Mar 2018
In situ high-temperature gas sensors: continuous monitoring of the combustion quality of different wood combustion systems and optimization of combustion process
Heinz Kohler1, Binayak Ojha1, Navas Illyaskutty1, Ingo Hartmann2, Christian Thiel2, Konrad Eisinger2, and Markus Dambacher3 1Institute for Sensor and Information Systems (ISIS), Hochschule Karlsruhe – Technik und Wirtschaft, Moltkestr. 30, 76133 Karlsruhe, Germany
2DBFZ Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, 04347 Leipzig, Germany
3Sick AG, Erwin-Sick-Straße 1, 79183 Waldkirch, Germany
Abstract. The sensing characteristics and long-term stability of different kinds of CO ∕ HC gas sensors (non-Nernstian mixed potential type) during in situ operation in flue gas from different types of low-power combustion systems (wood-log- and wood-chip-fuelled) were investigated. The sensors showed representative but individual sensing behaviour with respect to characteristically varying flue gas composition over the combustion process. The long-term sensor signal stability evaluated by repeated exposure to CO ∕ H2 ∕ N2 ∕ synthetic air mixtures showed no sensitivity loss after operation in the flue gas. Particularly for one of the sensors (Heraeus GmbH), this high signal stability was observed in a field test experiment even during continuous operation in the flue gas of the wood-chip firing system over 4 months. Furthermore, it was experimentally shown that the signals of these CO ∕ HC sensing elements yield important additional information about the wood combustion process. This was demonstrated by the adaptation of an advanced combustion airstream control algorithm on a wood-log-fed fireplace and by the development of a combustion quality monitoring system for wood-chip-fed central heaters.
Citation: Kohler, H., Ojha, B., Illyaskutty, N., Hartmann, I., Thiel, C., Eisinger, K., and Dambacher, M.: In situ high-temperature gas sensors: continuous monitoring of the combustion quality of different wood combustion systems and optimization of combustion process, J. Sens. Sens. Syst., 7, 161-167, https://doi.org/10.5194/jsss-7-161-2018, 2018.

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Short summary
Wood-log- and wood-chip-fuelled low-power combustion systems emit high amounts of uncombusted gaseous components like CO and particulate matter. Emissions can be effectively reduced by optimized combustion process control using high-temperature gas sensors. The sensing behaviour of gas sensors for continuous analysis of uncombusted components and their long-term stability have been studied. The sensor signals are used to improve the combustion process control and to monitor combustion quality.
Wood-log- and wood-chip-fuelled low-power combustion systems emit high amounts of uncombusted...
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