Martin S.,German Aerospace Center |
Lucka K.,OWI Oel Waerme Institute GmbH |
Worner A.,German Aerospace Center |
Vetter A.,Thuringer Landesanstalt fur Landwirtschaft
Chemie-Ingenieur-Technik | Year: 2011
Although there have been recent technical improvements, still there are numerous hurdles that stand against a widespread introduction of hydrogen- and fuel cell technology to the market. Besides the reduction of the production costs particular attention should be paid to the hydrogen infrastructure. Also the particular hydrogen production method is of importance. To evaluate the production of the secondary energy carrier hydrogen in a positive way, its production from renewable energy sources is of vital importance. Assuming that from 2020onwards an increasing amount of fuel cell powered vehicles is introduced to the market, the reforming of biofuels is a promising option. The presented evaluations of theoretical potentials show that in 2020 6-8% of the current fuel consumption could be covered by sustainably produced hydrogen. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Engelhardt P.,OWI Oel Waerme Institute GmbH |
Maximini M.,OWI Oel Waerme Institute GmbH |
Beckmann F.,Inhouse Engineering GmbH |
Brenner M.,Behr GmbH and Co. KG
International Journal of Hydrogen Energy | Year: 2012
This paper presents experimental results of a diesel steam reforming fuel processor operated in conjunction with a gas cleanup module and coupled operation with a PEM fuel cell. The fuel processor was operated with two different precious-metal based reformer catalysts, using diesel surrogate with a sulfur content of less than 2 ppmw as fuel. The first reformer catalyst entails an increasing residual hydrocarbon concentration for increasing reformer fuel feed. The second reformer catalyst exhibits a significantly lower residual hydrocarbon concentration in the reformate gas. Coupled operation of the fuel processor/gas cleanup with a PEM stack shows the impact of residual hydrocarbons on fuel cell performance. Using the second reformer catalyst, the fuel processor/gas cleanup was successfully coupled to an 80-cell stack generating an electric power output of up to 1.5 kWel. The system is foreseen to be used as a mobile auxiliary power unit (APU) for caravans and yachts or as a stationary energy supply. Highlights: Two precious-metal catalysts for diesel steam reforming tested. Coupled operation of fuel processor, gas cleanup and PEM fuel cell successful. Sensitivity of stack voltage to residual hydrocarbons observed. Operational boundaries for coupled system operation established. © 2012 Hydrogen Energy Publications, LLC.
Haas-Wittmuess R.,OWI Oel Waerme Institute GmbH |
Paesler L.,OWI Oel Waerme Institute GmbH |
Pillai R.,OWI Oel Waerme Institute GmbH |
Yildiz G.,OWI Oel Waerme Institute GmbH |
And 4 more authors.
International Journal of Energy for a Clean Environment | Year: 2010
Conventional central power generation shows a high electrical efficiency, but the transmission of the energy to the consumer is hindered by distribution losses. Decentralized combined heat and power (CHP) generation in proximity to the customer is an alternative to reduce transmission losses. Based on a natural gas-fired micro-CHP system, a liquid fuel burner system is developed. The modification of the natural gas system for operation with light fuel oil (no. 2) is the focus of this project. An innovative vaporization technique, i.e., cool flame vaporization, is used to create a homogenous fuel-air mixture. The combustion of the fuel-air mixture is surface stabilized, using the surface burner of the natural gas system. Different atomization techniques and nitrogen oxide reduction concepts, such as air staging and exhaust gas recirculation, were evaluated. By fulfilling stringent emission targets and safe operation in the complete power range, the concept of micro-CHP aims to achieve an efficient use of limited resources. © 2010 by Begell House, Inc.
Kreutzmann D.,OWI Oel Waerme Institute GmbH |
Montmann D.,OWI Oel Waerme Institute GmbH |
Pohland Vom Schloss H.,OWI Oel Waerme Institute GmbH |
Lucka K.,OWI Oel Waerme Institute GmbH |
And 3 more authors.
Chemie-Ingenieur-Technik | Year: 2012
The in situ detection of damage of insulating materials in thermal processing plants is essential in ensuring a longer operating life. A temperature rise near the wall is an indication of damaged insulation. It was observed during the investigation that measurement of temperature in the insulating material contributed significantly to the prediction of damage. Numerical methods showed that the temperature distribution in the wall can be used to determine the depth of damage. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.