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Controlled Hot Surface Ignition in Stationary Petrol and Natural Gas Operation
Technical Paper
2012-32-0006
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An operation with a lean air-fuel mixture enables smaller
cogeneration gas engines to operate at both high efficiency and low
NOx emissions. Conventionally, the combustion process is
induced through spark ignition. However, its small reactive mixture
volume sets limits on increasing the air-fuel ratio, as a higher
dilution reduces mixture inflammability as well as flame
propagation speed. In addition, the spark plug durability is
limited due to electrode wear, particularly through spark erosion,
causing high maintenance costs. The ignition by means of a hot
surface has great potential to extend the frequency of servicing
intervals as well as to improve the trade-off between engine
efficiency and NOx emissions. Compared to conventional
spark ignition, ignition by means of a hot surface is achieved by
accelerated combustion. The latter is produced by an increased
initial reactive mixture volume.
A hot surface ignition (HSI) system was developed for stationary
lean-burn operation, in due consideration of manufacturing costs,
lifetime and electrical characteristics that allow for a reliable
control of ignition timing. The temperature of the hot surface, and
hence the inflammation timing, can be adjusted through its
electrical power supply. In order to analyze the impact of the flow
conditions on the inflammation process, several designs of
inflammation elements were developed.
In a first step, experimental trials were carried out using a
single-cylinder test bed engine, running with a lean homogeneous
air-petrol mixture at constant load and speed. Compared to
prechamber spark ignition, HSI enhances the lean-burn limit,
resulting in an improvement of the efficiency-NOx
trade-off. Due to a notable correlation between mean combustion
temperature and combustion phasing, a closed-loop algorithm for
controlling combustion phasing was developed. Subsequently, the
ignition system was applied to a series natural gas lean-burn
cogeneration engine. An increase of the lean-burn limit compared to
that of the prechamber spark plug was also achieved.
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Authors
- Denis Neher - Karlsruhe University of Applied Sciences
- Fino Scholl - Karlsruhe University of Applied Sciences
- Victor Teschendorff - Karlsruhe University of Applied Sciences
- Maurice Kettner - Karlsruhe University of Applied Sciences
- Philipp Huegel - Karlsruhe Institute Of Technology
- Heiko Kubach - Karlsruhe Institute Of Technology
- Markus Klaissle - Senertec Kraft-Wärme-Energiesysteme GmbH
- Blanca Giménez Olavarria - University of Valladolid
Topic
Citation
Neher, D., Scholl, F., Teschendorff, V., Kettner, M. et al., "Controlled Hot Surface Ignition in Stationary Petrol and Natural Gas Operation," SAE Technical Paper 2012-32-0006, 2012, https://doi.org/10.4271/2012-32-0006.Also In
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