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Performance Analysis of a Reciprocating Piston Expander and a Plate Type Exhaust Gas Recirculation Boiler in a Water-Based Rankine Cycle for Heat Recovery from a Heavy Duty Diesel Engine

Gunnar Latz (Institutionen för tillämpad mekanik, Förbränning) ; Olof Erlandsson ; Thomas Skåre ; Arnaud Contet ; Sven Andersson (Institutionen för tillämpad mekanik, Förbränning) ; Karen Munch (Institutionen för tillämpad mekanik, Förbränning)
Energies (1996-1073). Vol. 9 (2016), 7, p. 495.
[Artikel, refereegranskad vetenskaplig]

The exhaust gas in an internal combustion engine provides favorable conditions for a waste-heat recovery (WHR) system. The highest potential is achieved by the Rankine cycle as a heat recovery technology. There are only few experimental studies that investigate full-scale systems using water-based working fluids and their effects on the performance and operation of a Rankine cycle heat recovery system. This paper discusses experimental results and practical challenges with a WHR system when utilizing heat from the exhaust gas recirculation system of a truck engine. The results showed that the boiler’s pinch point necessitated trade-offs between maintaining adequate boiling pressure while achieving acceptable cooling of the EGR and superheating of the water. The expander used in the system had a geometric compression ratio of 21 together with a steam outlet timing that caused high re-compression. Inlet pressures of up to 30 bar were therefore required for a stable expander power output. Such high pressures increased the pump power, and reduced the EGR cooling in the boiler because of pinch-point effects. Simulations indicated that reducing the expander’s compression ratio from 21 to 13 would allow 30% lower steam supply pressures without adversely affecting the expander’s power output.

Nyckelord: waste-heat recovery (WHR); piston expander; Rankine cycle



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Denna post skapades 2016-06-29. Senast ändrad 2016-10-04.
CPL Pubid: 238667

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning

Ämnesområden

Energi
Transport
Hållbar utveckling
Termisk energiteknik

Chalmers infrastruktur