Advances in Waste Heat Recovery Systems for Gas Engines

Paper #:
  • 2013-01-2433

Published:
  • 2013-09-24
DOI:
  • 10.4271/2013-01-2433
Citation:
Boretti, A., "Advances in Waste Heat Recovery Systems for Gas Engines," SAE Technical Paper 2013-01-2433, 2013, https://doi.org/10.4271/2013-01-2433.
Author(s):
Affiliated:
Pages:
10
Abstract:
The paper presents a novel concept of very efficient transportation engines for operation with CNG, LNG or LPG. The combustion system permits mixed diesel/gasoline-like operation changing the load by quantity of fuel injected and modulating the premixed and diffusion combustion phases for high fuel energy transfer to piston work. A waste heat recovery system (WHRS) is then recovering the intercooler and engine coolant energy plus the exhaust energy. The WHRS uses a power turbine on the exhaust and a steam turbine feed by a single loop turbo-steamer. The WHRS is the enabler of much faster warm up of the engine and further improvements of the top fuel conversion efficiency to above 50% for the specific case with reduced fuel efficiency penalties changing the load or the speed.
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