Jenbacher


Pre-chamber combustion concept Function


The pre-chamber combustion system helps maximize efficiency and combustion stability, while minimizing NOx-emissions. Near the spark plug the lean mixture is enriched to almost stoichiometric level to achieve a fast burn rate and a very high efficiency. The enrichment is done by additional gas supplied directly into the pre-chamber during the scavenging stroke by a simple and robust mechanical pre-chamber gas valve. The Jenbacher type 6 is based on a mixture boosted concept, so the high gas pressure demand of approximately 4 barg is only required for about 2 Vol% of the entire gas volume flow.


Features / Benefits


• High efficiency • Stable engine operation with changing fuel qualities • Low NOx-emissions (misfiring limit) • Gas pressure of ~ 4 barg only required for small pre-chamber gas supply (~ 2 Vol%)


Innovative technology


The pre-chamber combustion system is a common technology for high-performance engines with a bore size typically larger than approximately 200 mm. Low-speed engines are based mainly on air-boosted concepts requiring a high gas pressure (4 – 5 barg) for the entire fuel gas. Insuficient gas pressure causes additonal investment and parasistic loads for a gas compressor system.


A direct combustion concept with a standard spark plug results in reduced efficiency because it is not able to achieve a fast burn rate for large bore engines. Spark plugs with integrated pre-chamber are just slightly better than a standard spark plug regarding efficiency and misfiring limit but will always lag behind a pre-chamber com- bustion system.


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