Potential of high compression ratio combined with knock suppression strategy for improving thermal efficiency of spark ignition stoichiometric natural gas engine

Xing, Kongzhao; Guan, Wei; Guo, Xiaoyu; Wang, Yi; Tu, Zhanfei; Huang, Haozhong

doi:10.1016/j.enconman.2022.116544

Cited by 16 publications

(4 citation statements)

References 38 publications

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“…The energy balance of the oilfield facility can be calculated by Equations ( 5) and ( 6): The power from the natural gas-distributed energy system varies with the electricity demand of the oilfield facility, and all the electricity generated is supplied to the oilfield facility. A gas engine (also known as a reciprocating internal combustion engine) is selected as the prime mover because of the high open cycle efficiency under such low electric load, suitability for hot water production, adaptability to frequent starts and stops, and flexibility to fuel types [32]. The recoverable heat from the gas engine is used to meet the heating load of the oilfield facility, and the natural gas boiler supplements the shortage.…”

Section: Energy Supply Methods 1: Following the Electric Load (Fel)mentioning

confidence: 99%

Research on the Integration of a Natural Gas-Distributed Energy System into the Oilfield Facility in China

2023

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The oilfield facility provides a sufficient supply of self-produced natural gas and has an obvious price advantage. However, China’s oilfield facilities are supplied with electricity and heat from the external grid and natural gas boilers separately. Therefore, in this study, a natural gas distributed energy saving system is built in the oilfield facility, which can supply electricity and heating simultaneously. An oilfield facility in Changchun, China, is used as the case study in this research to design a natural gas-distributed energy system. The operational carbon emissions and the operating cost are used as evaluation criteria. Three energy supply methods of the natural gas-distributed energy system are studied. Meanwhile, the impacts of China’s distributed energy policy are also quantified to determine the capacity of the power generation units. The results reveal that under the optimized following the heating load method (FHL-restricted), where the self-electricity consumption ratio of the gas engine is kept at 50%, the natural gas-distributed energy systems can meet policy requirements while achieving optimal carbon emission reductions and minimizing operating costs. The newly built system can simultaneously achieve the goals of energy saving, carbon emission reduction, and energy cost mitigation.

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Section: Energy Supply Methods 1: Following the Electric Load (Fel)mentioning

confidence: 99%

Research on the Integration of a Natural Gas-Distributed Energy System into the Oilfield Facility in China

2023

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“…• Adaptation of the thermodynamic cycle: Increasing the compression ratio is a well-known strategy widely applied to different Heat Engines, such as reciprocating internal combustion engines (RICE) or gas turbines (GT) (Benajes et al, 2019;Bontempo and Manna, 2019;Xing et al, 2023).…”

Section: Thermal Efficiencymentioning

confidence: 99%

Grand challenges in heat engines

Novella

2023

Front. Therm. Eng.

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“…Giorgio's [28,29] experiment found that increasing the opening of the HP EGR valve in a turbocharged multicylinder engine can reduce the brake-specific fuel consumption (BSFC) and the PCP of combustion as the result of a decline in pumping work. EGR-diluted low-temperature combustion also lowers the combustion temperature [30], which is beneficial to reducing heat losses. However, a reduction in cylinder oxygen concentration by EGR slows down the combustion rate and prolongs combustion duration, which is unfavorable for thermal efficiency improvement [31,32].…”

Section: Oemmentioning

confidence: 99%

Parametric Analysis and Optimization for Thermal Efficiency Improvement in a Turbocharged Diesel Engine with Peak Cylinder Pressure Constraints

Li,

Mao,

Yue

et al. 2023

Energies

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While the original equipment manufacturers are developing engines that can withstand higher PCP, the methodology to maximize the thermal efficiency gain with different PCP limits is still not well-known or documented in the literature. This study aims to provide guidance on how to co-optimize air system parameters, compression ratio, and intake valve closing (IVC) timing of heavy-duty turbocharged diesel engines to enhance thermal efficiency with peak cylinder pressure (PCP) constraints. In this study, a one-dimensional turbocharged engine model is established and validated by experimental data. The effects of turbocharger efficiency, boost pressure, high-pressure exhaust gas recirculation (HP EGR) ratio, compression ratio (CR), and IVC timing on diesel engine efficiency are assessed under PCP constraints through parametric analysis. The results indicate that for enhancing engine thermal efficiency under limited PCP, an increment in boost pressure and CR, and late IVC timing compared to baseline is required. By multiple parameter optimization, the best parameter combination under different PCP constraints is proposed. At a PCP limit of 20 MPa, the combination of a compression ratio of 18.57, boost pressure of 298 kPa, and IVC timing of −95.2 °CA ATDC yields a 1.56% (absolute value) improvement in ITEn over the baseline condition. Raising the PCP limits from 20 MPa to 25 MPa requires increasing the compression ratio to 21.92, boost pressure to 308 kPa, and delaying the intake valve closing timing to −88.7 °CA ATDC, which results in an absolute improvement of 0.86% in ITEn. Baseline engine configuration is updated accordingly to validate the thermal efficiency improvement strategy at a 25 MPa PCP limitation. Experimental results demonstrate a 2.2% (absolute value) improvement in brake thermal efficiency and 1.98% (absolute value) improvement in overall energy efficiency.

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Potential of high compression ratio combined with knock suppression strategy for improving thermal efficiency of spark ignition stoichiometric natural gas engine

Cited by 16 publications

References 38 publications

Research on the Integration of a Natural Gas-Distributed Energy System into the Oilfield Facility in China

Research on the Integration of a Natural Gas-Distributed Energy System into the Oilfield Facility in China

Grand challenges in heat engines

Parametric Analysis and Optimization for Thermal Efficiency Improvement in a Turbocharged Diesel Engine with Peak Cylinder Pressure Constraints

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