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Partial catalytic dehydrogenation of selected components of kerosene

Käfer, Timo (2013) Partial catalytic dehydrogenation of selected components of kerosene. Diploma, TU Kaiserslautern.

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Abstract

Conventional gas turbine auxiliary power units (APUs) supply an airplane with power during on-land operations, though have a poor efficiency and high emissions. To lower emissions and fuel consumption, these APUs could be replaced by fuel cells that produce "clean and silent" energy. The approach of partial catalytic dehydrogenation (PCD) is chosen to supply the fuel cell with hydrogen, extracted from kerosene. The PCD system consists of a fractioning to remove sulphur (operating at 1 bar) the actual dehydrogena-tion and a gas purification to remove gaseous hydrocarbons (operating at 8 bar). Surrogates of kerosene are created to investigate the influence of single substance groups on the dehydrogenation. In a test bench, extensive dehydrogenation tests are performed with single components of the surrogates, namely n-decane and methylcyclohexane (MCH). Ideal operating conditions for 1 bar —the pressure of the upstream process— and 8 bar —the pressure of the downstream process— are determined in respect of achieving a high hydrogen yield and a low coke formation, the latter important for a stable process. Furthermore, the composition of the gaseous and liquid product is investigated. For 1 bar, a temperature of 400 oC and a contact time of 2sec are found which result in a stable process with a hydrogen yield of 460 nLH2 kg^-1 MCH. For 8 bar, the optimal temperature and contact time are 425 °C and 4 sec, resulting in higher coke formation and a hydrogen yield smaller than 100 nLH2 kg^-1 MCH. The determination of which pressure level results in the better overall efficiency of the PCD system is beyond the boundaries of this work but must be evaluated in a subsequent process simulation.

Item URL in elib:https://elib.dlr.de/85801/
Document Type:Thesis (Diploma)
Additional Information:Betreuerin am DLR: Karolina Pearson
Title:Partial catalytic dehydrogenation of selected components of kerosene
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Käfer, TimoUNSPECIFIEDUNSPECIFIED
Date:22 August 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:partial catalytic dehydrogenation, kerosene, methylcyclohexane, decane
Institution:TU Kaiserslautern
Department:Maschinenbau und Verfahrenstechnik
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Swiecki, Karolina
Deposited On:02 Dec 2013 12:45
Last Modified:12 Dec 2013 22:17

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