Artículo de revista
Energy and Exergy Analysis of Different Exhaust Waste Heat Recovery Systems for Natural Gas Engine Based on ORC
Registro en:
1996-1073
Corporación Universidad de la Costa
REDICUC - Repositorio CUC
Autor
Valencia, Guillermo
Fontalvo, Armando
Cárdenas, Yulineth
Duarte, Jorge
Isaza, Cesar
Institución
Resumen
Waste heat recovery (WHR) from exhaust gases in natural gas engines improves the overall
conversion efficiency. The organic Rankine cycle (ORC) has emerged as a promising technology
to convert medium and low-grade waste heat into mechanical power and electricity. This paper
presents the energy and exergy analyses of three ORC–WHR configurations that use a coupling
thermal oil circuit. A simple ORC (SORC), an ORC with a recuperator (RORC), and an ORC
with double-pressure (DORC) configuration are considered; cyclohexane, toluene, and acetone are
simulated as ORC working fluids. Energy and exergy thermodynamic balances are employed to
evaluate each configuration performance, while the available exhaust thermal energy variation
under different engine loads is determined through an experimentally validated mathematical
model. In addition, the effect of evaporating pressure on the net power output, thermal efficiency
increase, specific fuel consumption, overall energy conversion efficiency, and exergy destruction is also
investigated. The comparative analysis of natural gas engine performance indicators integrated with
ORC configurations present evidence that RORC with toluene improves the operational performance
by achieving a net power output of 146.25 kW, an overall conversion efficiency of 11.58%, an ORC
thermal efficiency of 28.4%, and a specific fuel consumption reduction of 7.67% at a 1482 rpm engine
speed, a 120.2 L/min natural gas flow, 1.784 lambda, and 1758.77 kW of mechanical engine power