Application of a pre-combustion chamber (PCC) ignition system is one of the methods to\nimprove combustion stability and reduce toxic compounds emission, especially NOx. Using PCC\nallows the operation of the engine at lean combustion conditions or the utilization of low calorific\ngaseous fuels such as syngas or biogas. The paper presents the results of an experimental study of\nthe combustion process in two stroke, large bore, stationary gas engine GMVH 12 equipped with\ntwo spark plugs (2-SP) and a PCC ignition system. The experimental research has been performed\nduring the normal operation of the engine in an industrial compression station. It was observed that\napplication of PCC provides less cycle-to-cycle combustion variation (more than 10%) and nitric oxide\nand carbon monoxide emissions decreased to 60% and 26% respectively. The total hydrocarbon (THC)\nemission rate is 25% higher for the engine equipped with PCC, which results in roughly two percent\nengine efficiency decrease. Another important criterion of engine retrofitting was the PCC location in\nthe engine head. The experimental results show that improvement of engine operating parameters\nwas recorded only for a configuration with one port offset by 45ââ??¦ from the axis of the main chamber.\nThe study of the ignition delay angle and equivalence ratio in PCC did not demonstrate explicit\ninfluence on engine performance.
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