Investigation of In-Cylinder Steam Injection in a Turbocharged Diesel Engine for Waste Heat Recovery and NO x Emission Control

Zhongbo Zhang and Lifu Li
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Zhongbo Zhang: School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China
Lifu Li: School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China

Energies, 2018, vol. 11, issue 4, 1-22

Abstract: In this study, an in-cylinder steam injection method is introduced and applied to a turbocharged diesel engine for waste heat recovery and NO x emission reduction. In the method, cool water was first heated into superheated steam by exhaust. Then the superheated steam was directly injected into the cylinder during the compression stroke. The potential for fuel savings and NO x emission reduction obtained by this method was investigated. First, a two-zone combustion model for the baseline engine was established and calibrated with the experimental data. Based on the model, the effects of steam injection mass, temperature, and timing on engine performance and NO x emission were investigated. The results demonstrate that in-cylinder steam injection can improve engine performance and reduce NO x emissions significantly at all engine speeds. Optimal steam injection mass is obtained under full load at engine speed from 1000 rpm to 1900 rpm when the steam injection timing and temperature are ?30° and 550 K, respectively. Under those conditions, engine torque is increased by 9.5–10.9%, brake-specific fuel consumption (BSFC) is reduced by 8.6–9.9%, and NO x emission is decreased by 83.4–91.8%. Steam injection mass and injection timing are the main parameters that significantly affect engine performance and NO x emission.

Keywords: in-cylinder steam injection; waste heat recovery; turbocharged diesel engine; performance; NO x emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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