A fiber optics system for monitoring utilization of ZnO adsorbent beds during desulfurization for logistic fuel cell applications
| Autor: | Hongyun Yang, Bruce J. Tatarchuk, Paul S. Dimick, Achintya Sujan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Optical fiber
Materials science Waste management Moisture Renewable Energy Sustainability and the Environment Proton exchange membrane fuel cell Response time Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Flue-gas desulfurization Volumetric flow rate Adsorption Chemical engineering law Fuel cells Physical and Theoretical Chemistry Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 315:242-253 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2016.03.038 |
| Popis: | An in-situ fiber optic based technique for direct measurement of capacity utilization of ZnO adsorbent beds by monitoring bed color changes during desulfurization for fuel cell systems is presented. Adsorbents composed of bulk metal oxides (ZnO) and supported metal oxides (ZnO/SiO2 and Cu ZnO/SiO2) for H2S removal at 22 °C are examined. Adsorbent bed utilization at breakthrough is determined by the optical sensor as the maximum derivative of area under UV-vis spectrum from 250 to 800 nm observed as a function of service time. Since the response time of the sensor due to bed color change is close to bed breakthrough time, a series of probes along the bed predicts utilization of the portion of bed prior to H2S breakthrough. The efficacy of the optical sensor is evaluated as a function of inlet H2S concentration, H2S flow rate and desulfurization in presence of CO, CO2 and moisture in feed. A 6 mm optical probe is employed to measure utilization of a 3/16 inch ZnO extrudate bed for H2S removal. It is envisioned that with the application of the optical sensor, desulfurization can be carried out at high adsorbent utilization and low operational costs during on-board miniaturized fuel processing for logistic fuel cell power systems. |
| Databáze: | OpenAIRE |
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