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Ultra-low emission power generation with chemically stabilized waste plastics pyrolysis oil [Elektronski vir]
Žvar Baškovič, Urban ...
Emission standards in European Union, designed to reduce the environmental impact of power generation, present a significant challenge for fast-response distributed power generation systems based on ...internal combustion engines. Regulated emissions, such as NOx and particulate matter present a major concern due to their adverse number of environmental and health effects. Simultaneously, European Union strives towards sustainable management of plastic waste and seeks the ways for its upcycling and production of new fuels and chemicals. As an answer to the presented challenges, the present experimental study addresses the potential for use of chemically stabilized Waste Plastics Oil (WPO), a product of pyrolysis process of waste plastics in a Reactivity Controlled Compression Ignition (RCCI) combustion concept. To establish a reactivity-controlled combustion, the study uses a combination of methane (a model fuel for biomethane) and WPO to a) simultaneously reduce NOx and particulate matter emissions due to low local combustion temperatures and a high degree of charge homogenization and b) address waste and carbon footprint reduction challenges. Through experiments, influence of direct injection timing and energy shares of utilized fuels to incylinder thermodynamic parameters and engine emission response were evaluated in engine operating points at constant indicated mean effective pressure. Acquired results were deeply investigated and benchmarked against compression ignition and RCCI operation with conventional diesel fuel to determine potential for WPO utilization in an advanced lowtemperature combustion concept. Results show that chemically stabilized WPO can be utilized in RCCI combustion concept without adaptation of injection parameters and that with suitable control parameters, ultra-low emissions of NOx and PM can be achieved with utilized fuels. For diesel/methane mix, NOx and PM emissions were compared to conventional compression ignition operation reduced for 82.0 % and 93.2 %, respectively, whereas for WPO/methane mix, NOx and PM emissions were reduced for 88.7 % and 97.6 %, respectively, which can be ascribed to for utilized combustion concept favourable chemical characteristics of WPO.
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