Ultra-low emission power generation utilizing chemically stabilized waste plastics pyrolysis oil in RCCI combustion concept
ID Žvar Baškovič, Urban (Author), ID Katrašnik, Tomaž (Author), ID Faussone, Gian Claudio (Author), ID Grilc, Miha (Author), ID Seljak, Tine (Author)

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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 NO$_x$ 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 NO$_x$ 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 in-cylinder 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 (CI) and RCCI operation with conventional diesel fuel to determine potential for WPO utilization in an advanced low-temperature combustion concept. Results show that chemically stabilized WPO can be efficiently utilized in RCCI combustion concept without adaptation of injection parameters and that with suitable control parameters, ultra-low emissions of NO$_x$ and PM can be achieved with utilized fuels. For diesel/methane mix, NO$_x$ and PM emissions were reduced compared to conventional CI operation for 82.0% and 93.2%, respectively, whereas for WPO/methane mix, NO$_x$ and PM emissions were reduced for 88.7% and 97.6%, respectively, which can be ascribed to favourable chemical characteristics of WPO for the utilized combustion concept. In the least favourable operating point among those studied, indicated mean effective pressure covariance was kept below 2.5%, which is well below 5% being considered the limit for stable engine operation.

Keywords:plastic pyrolysis oil, RCCI, waste-derived fuels, combustion process, emissions, chemical stabilization
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Number of pages:13 str.
Numbering:Vol. 344, art. 118711
PID:20.500.12556/RUL-148381 This link opens in a new window
ISSN on article:1095-8630
DOI:10.1016/j.jenvman.2023.118711 This link opens in a new window
COBISS.SI-ID:161635843 This link opens in a new window
Publication date in RUL:21.08.2023
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Record is a part of a journal

Title:Journal of environmental management
COBISS.SI-ID:107255555 This link opens in a new window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

Keywords:pirolizno olje iz plastike, RCCI, goriva iz odpadkov, zgorevalni proces, emisije, kemična stabilizacija


Funder:ARRS - Slovenian Research Agency
Project number:P2-0152
Name:Kemijsko reakcijsko inženirstvo

Funder:ARRS - Slovenian Research Agency
Project number:P2-0401
Name:Energetsko strojništvo

Funder:ARRS - Slovenian Research Agency
Project number:J2-2492
Name:Razvoj procesov valorizacije lignina kot vira aromatskih gradnikov za proizvodnjo bioosnovanih polimerov

Funder:ARRS - Slovenian Research Agency
Project number:Z2-1862
Name:Zgorevanje brez okoljskega odtisa za proizvodnjo zelene energije

Funder:Other - Other funder or multiple funders
Funding programme:CELSA (Central European Leuven Strategic Alliance)
Name:Towards continuous combustion of gasified municipal solid waste

Funder:EC - European Commission
Funding programme:EASME-EMFF, Sustainable Blue Economy Call
Project number:EASME/EMFF/2017/

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