Heat-Integrated Exhaust Purification for Natural Gas Powered Vehicles : System Theory, Design Concepts, Simulation and Experimental Evaluation.

Intro -- 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 -- 2.1.1 Heat-exchanger reactor -- 2.1.2 Reference system -- 2.2 Simplified mathematical models for stationary analysis -- 2.2.1 Introduction and motivation -- 2.2.2 Quasihomogeneous models for exemplary design cases -- 3 Stationary simulations -- 3.1 Parameter continuation and stability analysis in DIANA -- 3.2 Analysis of stationary operating behavior -- 3.2.1 Standard ceramic monolith with catalytic coating -- 3.2.2 Fully coated heat-exchanger concept -- 3.2.3 Partially coated heat-exchanger concept -- 3.3 Continuation of design specifications -- 3.3.1 Standard ceramic honeycomb -- 3.3.2 Heat-integrated systems -- 3.4 Conclusions -- 4 Dynamic simulations -- 4.1 Transient behavior of partially coated heat exchanger -- 4.1.1 Heating in countercurrent operating mode -- 4.1.2 Heating with flap/bypass system -- 4.2 Heating strategies for operation under drive cycle conditions -- 4.2.1 Feed conditions for drive cycle simulations -- 4.2.2 Geometric properties of full-scale systems -- 4.2.3 Bypass/flap system, no auxiliary heating -- 4.2.4 Bypass/flap system with electric auxiliary heating -- 4.3 Sequential system -- 4.3.1 Geometric properties of full-scale sequential prototype -- 4.3.2 Comparative study on NEDC performance -- 4.4 Conclusions -- 5 Reactor prototypes and experimental evaluation -- 5.1 Folded sheet prototype -- 5.1.1 Reactor layout and dimensions -- 5.1.2 Stationary experimental evaluation -- 5.2 Brazed prototype -- 5.2.1 Reactor layout and dimensions -- 5.2.2 Stationary experimental evaluation.

5.2.3 Comparison of heat exchanger performance -- 5.2.4 Stationary stoichiometric conditions -- 5.3 Sequential system - experimental evaluation -- 5.3.1 Reactor layout and dimensions -- 5.3.2 Transient cold start experiments -- 5.3.3 Stationary experiments -- 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.

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Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2024. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.