Investigation of engine waste heat recovery using supercritical CO2 (S-CO2) cycle system

Jian Song, Xiao Dong Ren, Chun Wei Gu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Primary energy consumption of diesel engines is increasingrapidly and strict emission standards are introduced by thegovernment. Interests in engine waste heat recovery have beenrenewed to alleviate the energy shortage and emission issues.Supercritical CO2 (S-CO2) cycle has emerged as a promisingmethod considering its compact structure and system safety levelin addition to the environmental friendly characteristics. Thispaper explores the potential of using S-CO2 cycle system forengine waste heat recovery. Both heat load from the lowtemperature jacket cooling water and the high temperatureengine exhaust gas are intended to be recovered. In the originalsystem, the jacket cooling water is used to preheat the S-CO2working fluid and the engine exhaust gas is utilized in thepreheater. As an optimized scheme, system with two preheatersis presented. The engine exhaust gas is further cooled in a hightemperature preheater after the jacket cooling water in the lowtemperature preheater. The available heat load from these twoheat sources can be entirely recovered. However, the increasingpreheating temperature suppresses the regeneration effect. Aregeneration branch is then added in the system. Part of the SCO2 working fluid from the compressor goes into a lowtemperature regenerator and then converges with the other partfrom the two preheats. A deeper utilization of the regenerationheat load is achieved and performance enhancement of the SCO2 cycle system is expected. The maximum net power outputof the system with regeneration branch reaches 82.8 kW, whichresults in an 8.5% increment on the engine power output.

Original languageEnglish
Title of host publicationOil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791851180
DOIs
Publication statusPublished - 2018
EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
Duration: 11 Jun 201815 Jun 2018

Publication series

NameProceedings of the ASME Turbo Expo
Volume9

Conference

ConferenceASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
Country/TerritoryNorway
CityOslo
Period11/06/1815/06/18

Bibliographical note

Publisher Copyright:
© 2018 Solar Turbines Incorporated.

ASJC Scopus subject areas

  • General Engineering

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