search query: @keyword reformointi / total: 5
reference: 4 / 5
« previous | next »
Author:Kotisaari, Mikko
Title:Dimethyl ether reforming for high temperature PEM fuel cells
Dimetyylieetterin reformointi korkealämpötila PEM polttokennoille
Publication type:Master's thesis
Publication year:2009
Pages:[7] + 70      Language:   eng
Department/School:Informaatio- ja luonnontieteiden tiedekunta
Main subject:Ydin- ja energiatekniikka   (Tfy-56)
Supervisor:Lund, Peter
Instructor:Jensen, Jens Oluf ; Li, Qingfeng
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201203091368
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark S80     | Archive
Keywords:Dimethyl ether
DME
reforming
hydrogen
high temperature PEM
PBI
dimetyylieetteri
DME
reformointi
vety
korkealämpötila PEM
PBI
Abstract (eng): The work studies the suitability of the synthetic fuel dimethyl ether (DME) for fuel cells.
The work includes a large experimental section, which has been done in Technical University of Denmark, Department of Chemistry, Energy and Materials Science Group.

Currently, methanol is seen as probably the most suitabl e fuel for small scale polymer electrolyte membrane (PEM) fuel cells.
DME, with a chemical formula of CH3OCH3 is a further synthesized fuel, which is a gas at room temperature but can be easily liquefied.
It burns in a diesel motor with low emissions and can be handled as liquefied petroleum gas (LPG).
Although synthesizing DME consumes energy, by doing so there are benefits gained when considering a fuel cell system.

In this work, a setup was built to produce electrical power from methanol and DME via a self-built reformer-fuel cell system.
Self-made reformer catalysts which help the chemical reaction towards hydrogen-rich gas are under focus.
There are numerous parameters affecting the reformate gas composition and this effect is studied.
The reformate gas was analysed by a mass spectrometer and led to a fuel cell.
The fuel cell type is a high temperature PEM, which has a considerable tolerance to high impurity levels without poisoning.

The setup worked well for methanol reforming.
In DME reforming, a high hydrogen yield was gained but could not be sustained.
Abstract (fin): Työ käsittelee synteettisen polttoaineen nimeltä dimetyylieetteri (DME) soveltuvuutta polttokennoille.
Työssä on laaja kokeellinen osuus, joka on tehty Danmarks Tekniske Universitetin kemian osastolla Energy and Materials Science Group -tutkimusryhmässä.

Metanoli on toistaiseksi kenties lupaavin pienen mittakaavan polymeerielektrolyyttimembraani (PEM) -tyyppisten polttokennojen polttoaine.
DME, kemialliselta kaavaltaan CH3OCH3, on huonelämpötilassa kaasumainen, helposti nesteytettävä metanolista jalostettu polttoaine.
Se palaa puhtaasti dieselmoottorissa ja sitä voidaan käsitellä nestekaasun tavoin.
DME:n valmistus vaatii energiaa, mutta metanoliin verrattuna DME:llä saavutetaan monta systeemiä yksinkertaistavaa etua.

Työssä rakennettiin ja kalibroitiin laboratorioon koejärjestely, jolla tuotettiin sekä metanolista että DME:stä sähköä reformeri-polttokennosysteemillä.
Tutkimuksen pääpaino oli vertailla itse valmistettuja katalyyttimateriaaleja, jotka auttavat DME:n hajoamisreaktiota vetypitoiseksi kaasuksi.

Reformaattikaasun koostumukseen vaikuttavia parametreja on lukuisia ja niiden vaikutusta tutkitaan.
Kaasun koostumus analysoitiin massaspektrometrillä ja kaasua syötettiin polttokennoon.
Polttokennotyyppi on korkealämpötila PEM, joka kestää verrattain suuria epäpuhtausmääriä myrkyttymättä.

Koejärjestelyllä saavutettiin hyviä tuloksia metanolin reformoinnissa.
DME:n reformoinnissa saavutettiin parhaimmillaan hyviä tuloksia, mutta toivottua reaktiota ei pystytty ylläpitämään kauan.
ED:2010-03-25
INSSI record number: 39368
+ add basket
« previous | next »
INSSI