Modeling and Optimization of the Flue Gas Heat Recovery of a Marine Dual-Fuel Engine Based on RSM and GA

Abstract

Implementation of flue gas waste heat recovery is an effective way to improve the energy utilization of marine engines. This paper aims to model and optimize a marine four-stroke dual-fuel (DF) engine coupled with a flue gas waste heat recovery system. Firstly, the DF engine and waste heat recovery system were respectively modeled in GT-Power and Simulink environments and verified with experimental data. Then, a regression model was built using the response surface method, with the intake temperature, compression ratio, and pilot fuel injection timing as input parameters and parametric analysis was performed. Finally, multi-objective optimization of the waste heat recovery system was performed using a genetic algorithm. The result showed that the optimal solution is obtained when the intake temperature is 306.18 K, the geometric compression ratio is 14.4, and the pilot fuel injection timing is −16.68 °CA after the top dead center. The corresponding brake-specific fuel consumption was 155.18 g/kWh, reduced by 3.24%, and the power was 8025.62 kW, increased by 0.32%. At the same time, 280.98 kW of flue gas waste heat generation was obtained.

Fault Diagnosis of Ship Ballast Water System Based on Support Vector Machine Optimized by Improved Sparrow Search Algorithm

“…The aforementioned optimization problem is solved using the Lagrange multiplier approach. The ideal hyperplane function is shown in (18). In the formula, SV is the support vector.…”

“…Xie et al [17] used a genetic algorithm to optimize the BPNN engine fault diagnosis model. Meng et al [18] established a dual fuel engine and ship waste heat recovery model and optimized the multi-parameter objectives of the model using a genetic algorithm. As mentioned above, most optimization algorithms are limited to particle swarm optimization (PSO) and genetic algorithm (GA) [19], [20].…”

Opportunities of waste heat recovery from various sources: Review of technologies and implementation

“…Altosole et al [ 142 ] inferred that the majority of available research articles refer to WHR single steam pressure systems, irrespective of the possible energetic advantages of dual-pressure WHR plants. Marine DF engines make use of cleaner fuels, such as natural gas, which has the advantage of cushioning the effect of environmental emission challenges associated with diesel engines [ [143] , [144] , [145] ]. Presently, investigations on DF engines are focused majorly on combustion and emission characteristics, electronic regulation, turbocharged technology, fuel and gas control, etc.…”

“…Presently, investigations on DF engines are focused majorly on combustion and emission characteristics, electronic regulation, turbocharged technology, fuel and gas control, etc. Few studies have been carried out on the utilization of the flue gas waste heat of DF engines, and reports reveal that the integration of DF engines with WHR systems has shown the potential to increase their energy conversion efficiency [ 142 , 145 , 146 ].…”

Performance Modulation of S-CO2 Brayton Cycle for Marine Low-Speed Diesel Engine Flue Gas Waste Heat Recovery Based on MOGA

“…The multi-objective genetic algorithm used is able to identify the optimal value of the target, and the MOGA sets the parameters: number of samples 600, evolutionary generation 10, crossover factor 0.5 and mutation factor 0.5. The genetic algorithm also introduces systematic constraints to ensure that the algorithm converges to a feasible solution [ 32 ]. The constraints are as follows: …”