Optimization of exhaust emissions from marine engine fueled with LNG/diesel using response surface methodology

ABSTRACT

For accurately analyzing the emission performance of dual-fuel engine, an experimental scheme was designed based on response surface methodology, and the central composite design was applied to this study. Speed and load were used as the influencing factors, and NO_X, CO, CO₂, and HC were the corresponding responses. Data of dual-fuel engine emissions were utilized to set up mathematical model to analyze the emission characteristics of engine. Results of data analysis were found to match the original engine’s emissions. The significance of the model test showed that P-values of mathematic model are less than 0.05, which verified the validity of the designed model. Speed of 800 r/min and load of 64% were found to have better emission performance with higher desirability of 65.4% for the tested engine. Corresponding emissions were 0.16% of CO, 3.97% of CO₂, 463.92 ppm of NO_X, and 224.27 ppm of HC.

KEYWORDS:

• Emission
• dual-fuel engine
• speed
• load
• response surface methodology

Declaration of interest

The authors declare that they have no conflict of interest.

Additional information

Funding

This work was financially supported by China Postdoctoral Science Foundation [Grant No. 2017M621642] and National Natural Science Foundation of China [Grant No. 91741117].

Notes on contributors

Jiehui Li

Jiehui Li, male, Han nationality, born in 1963, a native of Nanjing City, JiangSu Province, is currently a professor and master’s supervisor at the Jiangsu University. He completed his Bachelor’s Degree in Jiangsu University (1989); Master’s Degree in Jiangsu University (1992); and PhD in JiangSu University (2006). His research areas are Electronic Control Technology of Automotive and Internal Combustion Engine and Emission Control Technology of Internal Combustion Engine.

Yeyang Han

Yeyang Han, male, Han nationality, born in January 1995, a native of Taizhou City, JiangSu Province, is currently a master degree candidate at Jiangsu University. He completed his Bachelor’s Degree in Jiangsu University (2016). His research areas are Electronic Control Technology of Automotive and Internal Combustion Engine and Emission Control Technology of Internal Combustion Engine.

Gongping Mao

Gongping Mao, male, Han nationality, born in November 1980, a native of Huanggang City, Hubei Province, is currently an associate professor and master’s supervisor at the Jiangsu University. He completed his Bachelor’s Degree in Wuhan University of Technology (2003); Master’s Degree in Shandong University of Technology (2006); and PhD in JiangSu University (2009). His research areas are Substitute Fuel of Internal Combustion Engine, Electronic Control Technology of Internal Combustion Engine, and Fuel Chemical Reaction Dynamics.

Ping Wang

Ping Wang, male, Han nationality, born in October 1972, is currently a professor and master’s supervisor at the Jiangsu University. He completed his Bachelor’s Degree in Nanjing University of Aeronautics and Astronautics (1994); Master’s Degree in Nanjing University of Aeronautics and Astronautics (1997); and PhD in Beijing University of Aeronautics and Astronautics (2001) and Lund University (2005). His research areas are Turbulent combustion, Combustion modeling, and Gas-turbine combustor simulation.