Karbon Yakalama Amaçlı Yarı Kapalı Çevrim Oksijen-Yakıt Yanma motorunda yük, giriş basıncı ve eşdeğerlik oranının etkilerinin deneysel analizi

Özet (abstract)

In this paper, an experimental evaluation was conducted to determine the effect of engine load, intake pressure, and the O2-to-fuel ratio (λ) on a Semi-Closed Cycle Oxy-Fuel Combustion (SCC-OFC) reciprocating internal combustion engine (RICE). To this end, tests were carried out at low and mid-high loads in a commercial compression ignition (CI) RICE retrofitted to OFC, sweeping intake pressure and λ at a constant temperature while employing water injection for evaporative cooling. On the one hand, it has been demonstrated that the CI engine can operate across a very wide range of EGR rates—up to 95% at low loads—although with excessive O2 dilution, as inherently high cycle pressure means high EGR and high trapped mass. On the other hand, at mid-high loads, suitable O2 concentrations are achieved even at high cycle pressures, thereby enabling efficient combustion. The cycle operating intake pressure is identified as a key variable in the optimization and control of closed-cycle RICEs. Furthermore, it was shown that the exhaust dry CO2 concentration can be isolated from variations in load, water injection, or EGR, maintaining a constant level through the control of λinj. A critical correlation was observed between the quantity of liquid water ingested by the engine and the deterioration of combustion efficiency (an increase in CO and uHC emissions), presenting a fundamental challenge for closed cycles operating with high wet EGR rates. The extended ignition delay caused by OFC CI - RICE offers a promising avenue for the adoption of highly reactive fuels, such as high-cetane biodiesel, paving the way for the integration of biofuels with source CO2 capture directly from the highly concentrated flue gas of SCC-OFC RICEs.

Yazarların özeti; kaynağından alınmıştır. Energy Conversion and Management, 2026 · DOI ↗