Research on exhaust energy distribution regulation for fuel economy improvement of turbocompound diesel engine

Leng, Ling; Ma, Zetai; Cheng, Jianghua; Shi, Lei; Deng, Kangyao

doi:10.1016/j.applthermaleng.2022.119708

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…Turbocharger [61] 2023 Experimental Specific fuel consumption can be reduced by 3.8% with optimal control of exhaust power distribution to the turbocharger.…”

Section: Whr Technologies Refs Year Type Of Study Resultsmentioning

confidence: 99%

Innovative Technology Strategies for the Sustainable Development of Self-Produced Energy in the Colombian Industry

2023

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This research studies the current state of the Colombian industrial sector, which is focused on self-generation processes. The study’s objective is to search for viable technological strategies that strengthen this particular sector’s competitiveness and sustainable development. The analysis shows that internal combustion engines represent 49% of the technologies used for self-generation. The main fuel used in the sector is natural gas, with a percentage of 56%. The lack of strategies for the use of residual heat and technological inefficiencies caused a loss of 36% in the energy used in the Colombian industrial sector. Thermoelectric generators are a feasible way to recover energy from exhaust gases in engines used for self-generation. Additionally, they allow a 4% reduction in fuel consumption and an improvement in the engine’s energy efficiency. The use of hydrogen as fuel allows a 30% reduction in polluting emissions, such as CO2, CO, HC, and particulate matter. Hydrogen production processes, such as water electrolysis, allow the participation of Colombia’s solar energy potential, leading to sustainable hydrogen production, efficiency (60–80%), and a lower economic cost. In general, the application of thermoelectric generators and the use of hydrogen gas allow the improvement of the Colombian industrial sector’s environmental, social, and economic aspects due to greater competitiveness and the reduction in emissions and operating costs.

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“…Turbocharger [61] 2023 Experimental Specific fuel consumption can be reduced by 3.8% with optimal control of exhaust power distribution to the turbocharger.…”

Section: Whr Technologies Refs Year Type Of Study Resultsmentioning

confidence: 99%

Innovative Technology Strategies for the Sustainable Development of Self-Produced Energy in the Colombian Industry

2023

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“…• Integration of Waste Heat Recovery (WHR) systems: The conversion of the energy rejected by Heat Engines into mechanical or electrical power is a very attractive alternative to increase the efficiency of the complete system. In this direction, The use of turbocompounding (Leng et al, 2023;Zhang et al, 2022), bottoming organic Rankine cycles (Xu et al, 2019;Varshil and Deshmukh, 2021) or thermoelectric systems (Rodriguez et al, 2019;Burnete et al, 2022) to recover the energy still available in the engine exhaust gas flow (high exergy) and/or in the coolant flow (low exergy) are alternatives gaining attention in RICE. Additionally, regeneration is a traditional option in GT, while the implementation of bottoming power cycles are recent alternatives being under investigation due to their potential (Li et al, 2021;Sun et al, 2021).…”

Section: Thermal Efficiencymentioning

confidence: 99%

Grand challenges in heat engines

Novella

2023

Front. Therm. Eng.

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“…Although recently built ships require only minor adjustments to meet the relevant standards, most old ships still need to reduce carbon emissions through methods such as limiting the engine power, improving the main engine [5], adjusting the waste-heat recovery system, utilizing alternative fuels [6][7][8] and installing emerging energy-conversion devices. However, the engine power limit significantly increases the sailing time, while main engine improvements and adopting alternative fuels may lead to significant modifications of old ships [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Improving the Overall Efficiency of Marine Power Systems through Co-Optimization of Top-Bottom Combined Cycle by Means of Exhaust-Gas Bypass: A Semi Empirical Function Analysis Method

Liu

Feng

et al. 2023

JMSE

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The mandatory implementation of the standards laid out in the Energy Efficiency Existing Ship Index (EEXI) and the Carbon Intensity Indicator (CII) requires ships to improve their efficiency and thereby reduce their carbon emissions. To date, the steam Rankine cycle (RC) has been widely used to recover wasted heat from marine main engines to improve the energy-conversion efficiency of ships. However, current marine low-speed diesel engines are usually highly efficient, leading to the low exhaust gas temperature. Additionally, the temperature of waste heat from exhaust gas is too low to be recovered economically by RC. Consequently, a solution has been proposed to improve the overall efficiency by means of waste heat recovery. The exhaust gas is bypassed before the turbocharger, which can decrease the air excess ratio of main engine to increase the exhaust gas temperature, and to achieve high overall efficiency of combined cycle. For quantitative assessments, a semi-empirical formula related to the bypass ratio, the excess air ratio, and the turbocharging efficiency was developed. Furthermore, the semi-empirical formula was verified by testing and engine model. The results showed that the semi-empirical formula accurately represented the relationships of these parameters. Assessment results showed that at the turbocharging efficiency of 68.8%, the exhaust temperature could increase by at least 75 °C, with a bypass ratio of 15%. Moreover, at the optimal bypass ratio of 11.1%, the maximum overall efficiency rose to 54.84% from 50.34%. Finally, EEXI (CII) decreased from 6.1 (4.56) to 5.64 (4.12), with the NOx emissions up to Tier II standard.

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Research on exhaust energy distribution regulation for fuel economy improvement of turbocompound diesel engine

Cited by 9 publications

References 36 publications

Innovative Technology Strategies for the Sustainable Development of Self-Produced Energy in the Colombian Industry

Innovative Technology Strategies for the Sustainable Development of Self-Produced Energy in the Colombian Industry

Grand challenges in heat engines

Improving the Overall Efficiency of Marine Power Systems through Co-Optimization of Top-Bottom Combined Cycle by Means of Exhaust-Gas Bypass: A Semi Empirical Function Analysis Method

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