Characteristic and regulation method of parallel turbocompound engine with steam injection for waste heat recovery

Rongchao Zhao, Dayang Wen, Weihua Li, Weilin Zhuge, Yangjun Zhang and Yong Yin

Energy, 2020, vol. 208, issue C

Abstract: In a parallel turbocompound engine, a power turbine (PT) is fitted in the exhaust pipe in parallel with the turbocharging turbine (CT) for waste heat recovery. In this study, steam is generated using the exhaust heat and injected at the turbines inlet to improve the turbine power and engine performance. Numerical model for the engine cycle is established using commercial software GT-POWER. The model is validated against the experimental results of the turbocompound engine and precisely predicts the engine performance. Based on the model, the impacts of the CT and PT sizes on the performance of the parallel turbocompound engine are evaluated firstly. It is found that variable geometry turbine (VGT) should be applied on PT to regulate the energy distribution between the two turbines at engine off-design condition. Then the influences of steam mass flow rate on the engine BSFC, power and efficiency are investigated. The optimum values of the steam mass flow rate and PT size is closely related to the exhaust temperature. At last, the characteristic and regulation pattern of the steam injected parallel turbocompound engines are compared with series turbocompound engine. In parallel turbcompound engine, the BSFC is decreased by 2.08%–3.28% with steam injection.

Keywords: Turbocompound engine; Steam injection; Waste heat recovery; Thermodynamics analysis; Energy conversion efficiency (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:208:y:2020:i:c:s0360544220315292

DOI: 10.1016/j.energy.2020.118422

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