Heat-integrated exhaust purification for natural gas powered vehicles
System theory, design concepts, simulation and experimental evaluation
Matthias Rink
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Matthias Rink, Heat-integrated exhaust purification for natural gas powered vehicles (2014), Logos Verlag, Berlin, ISBN: 9783832595715
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Beschreibung / Abstract
Compared to diesel or gasoline, using compressed natural gas as a fuel allows for significantly decreased carbon dioxide emissions. With the benefits of this technology fully exploited, substantial increases of engine efficiency can be expected in the near future. However, this will lead to exhaust gas temperatures well below the range required for the catalytic removal of residual methane, which is a strong greenhouse gas. By combination with a countercurrent heat exchanger, the temperature level of the catalyst can be raised significantly in order to achieve sufficient levels of methane conversion with minimal additional fuel penalty. This thesis provides fundamental theoretical background of these so-called heat-integrated exhaust purification systems. On this basis, prototype heat exchangers and appropriate operating strategies for highly dynamic operation in passenger cars are developed and evaluated.
Inhaltsverzeichnis
- BEGINN
- Symbols and abbreviations
- Zusammenfassung
- Abstract
- 1 Introduction
- 1.1 Engine concepts and specific challenges for exhaust purification
- 1.2 Heat-integrated exhaust purification
- 1.3 Thesis objectives and structure
- 2 Simulation models
- 2.1 1D-multiphase simulation models
- 2.2 Simplified mathematical models for stationary analysis
- 3 Stationary simulations
- 3.1 Parameter continuation and stability analysis in DIANA
- 3.2 Analysis of stationary operating behavior
- 3.3 Continuation of design specifications
- 3.4 Conclusions
- 4 Dynamic simulations
- 4.1 Transient behavior of partially coated heat exchanger
- 4.2 Heating strategies for operation under drive cycle conditions
- 4.3 Sequential system
- 4.4 Conclusions
- 5 Reactor prototypes and experimental evaluation
- 5.1 Folded sheet prototype
- 5.2 Brazed prototype
- 5.3 Sequential system - experimental evaluation
- 5.4 Conclusions
- 6 Directions for future work
- Bibliography
- A Experimental Facilities
- B Derivation of quasihomogeneous model equations
- C Approximation of light-off temperatures
- D Geometric and thermophysical properties of simulation models