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

Author: Matthias Rink
Publisher: Berlin : Logos Verlag Berlin, 2014.
Edition/Format:   eBook : Document : EnglishView all editions and formats
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Rink, Matthias.
Heat-Integrated Exhaust Purification for Natural Gas Powered Vehicles : System Theory, Design Concepts, Simulation and Experimental Evaluation.
Berlin : Logos Verlag Berlin, ©2014
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Matthias Rink
ISBN: 9783832595715 3832595716
OCLC Number: 1021804086
Description: 1 online resource (185 pages)
Contents: 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 behavior3.2.1 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 simulations4.2.2 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 evaluation5.2.3 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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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.

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