Abstract
Exhaust gas recirculation (EGR) is one of the main methods of reducing NOX emissions and has been widely used in marine diesel engines. This paper proposes an optimized comprehensive assessment method based on multi-objective grey situation decision theory, grey relation theory and grey entropy analysis to evaluate the performance and optimize rate determination of EGR, which currently lack clear theoretical guidance. First, multi-objective grey situation decision theory is used to establish the initial decision-making model according to the main EGR parameters. The optimal compromise between diesel engine combustion and emission performance is transformed into a decision-making target weight problem. After establishing the initial model and considering the characteristics of EGR under different conditions, an optimized target weight algorithm based on grey relation theory and grey entropy analysis is applied to generate the comprehensive evaluation and decision-making model. Finally, the proposed method is successfully applied to a TBD234V12 turbocharged diesel engine, and the results clearly illustrate the feasibility of the proposed method for providing theoretical support and a reference for further EGR optimization.
Highlights
Exhaust gas recirculation (EGR) is one of the effective ways to reduce NOX pollutant emissions and has been widely used in marine diesel engines
This study proposes a multi-objective grey situation decision-making method based on the subjective and objective empowerment optimization to solve the problems associated with EGR performance evaluation and optimal decision making for turbocharged diesel engines
Aiming at the problem of EGR performance evaluation and optimal decision-making for turbocharged diesel engines, the optimal compromise between the combustion and emission performance of the diesel engine is transformed into a weighting problem between the different evaluation targets
Summary
Exhaust gas recirculation (EGR) is one of the effective ways to reduce NOX pollutant emissions and has been widely used in marine diesel engines. The key to EGR technology is to introduce a sufficient amount of exhaust gas into the intake pipe and provide the best EGR rate based on the different operating conditions of the engine [4,5]. Due to the differing effects of various EGR rates on diesel engine performance and emissions, the power, economy and emission performance of diesel engines must be considered when determining the optimal EGR rate. The basic principle of EGR is to reduce NOX emissions as much as possible while having a minimal impact on other pollutant emissions. Most EGR has focused on ways of implementing EGR[6,7], experimental performance [8,9], EGR control [10,11,12,13,14] and no specific studies have evaluated
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