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![Characterization of Emissions and Non-homogeneous Fuel Decomposition an a Batch Run Two-stage Wood-fired Hydronic Heater için kapak resmi Characterization of Emissions and Non-homogeneous Fuel Decomposition an a Batch Run Two-stage Wood-fired Hydronic Heater için kapak resmi](/client/assets/d79c3e4af2b6d196/ctx/images/no_image.png)
Characterization of Emissions and Non-homogeneous Fuel Decomposition an a Batch Run Two-stage Wood-fired Hydronic Heater
Başlık:
Characterization of Emissions and Non-homogeneous Fuel Decomposition an a Batch Run Two-stage Wood-fired Hydronic Heater
Yazar:
Richter, Joseph P., author.
ISBN:
9780438048812
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (165 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Joseph C. Mollendorf Committee members: Thomas A. Butcher; Paul E. DesJardin; JiHyung Yoo.
Özet:
A major challenge often encountered in the domestic wood burning community is the inability to accurately determine real-time/instantaneous emissions and performance characteristics on unsteady batch run systems. These limitations are centered on a simplifying assumption; that the atomic ratios of the biomass fuel remains constant throughout the entirety of a burn. This simplification is widely realized to be inaccurate, yet for lack of a better approach it is perpetuated, accepted and more or less forgotten.
In this work an experimental and numerical study is conducted on a two-stage wood-fired hydronic heater where the first stage involves the gasification of the wood fuel and the second stage is an after-burning stage. An experimental facility is developed with a new fuel burn rate apparatus that is designed to overcome typical full appliance weighing difficulties. A system level model is developed which accounts for combustion and heat transfer of a constant fuel composition using well-stirred reactor theory for a single lumped chamber. The modeling results show reasonable agreement to experimental measurements but general accuracy is limited. Average full-run thermal efficiencies are measured in the range of 48-55%, however instantaneous thermal efficiency show non-physical (greater than unity) values. These challenges motivate the exploration of the non-homogeneous fuel decomposition.
A variable fuel formulation (VFF) is developed using common system measurements to calculate a real-time atomic fuel composition. The method demonstrates a robust ability to calculate fuel composition regardless of fuel type or moisture content and can be extended to determine realistic instantaneous thermal efficiencies. Application of the VFF with experimental measurements indicate the oxidization of pyrolysis gases and solid char occur at distinctly different time scales with the pyrolysis gases burning immediately, and the majority of the char oxidization occurring later. These developments are explicitly accounted for in an extended three-zone system level numerical model that considers the non-homogeneous fuel decomposition. Model results are shown to accurately characterize all major exhaust species and significantly improve the prediction of CO emissions compared with the constant fuel modeling approach.
Ultimately, this work shows that the assumption of a constant atomic fuel ratio can lead to inaccurate and potentially misleading results. It is demonstrated that knowledge of the instantaneous fuel composition is critical for accurate modeling and performance calculations in batch run systems.
Notlar:
School code: 0656
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(681862.1) | 681862-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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