Effect of post-injection strategy on greenhouse gas emissions of natural gas/diesel dual-fuel engine at high load conditions

Yousefi, Amin; Guo, Hongsheng; Birouk, Madjid; Liko, Brian; Lafrance, Simon

doi:10.1016/j.fuel.2020.120071

Cited by 27 publications

(5 citation statements)

References 33 publications

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“…eoretically, the links between the layers of the network structure are fully linked and the neurons of each layer can also be connected to each other [8][9][10][11]. erefore, combined with experience, DNN is selected.…”

Section: Dnnmentioning

confidence: 99%

Engineering Cost Prediction Model Based on DNN

Bingxin

Xin

Zhang

2022

Scientific Programming

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A DNN-based cost prediction method is proposed for the difficult problem of cost calculation in engineering cost accounting, combined with deep neural networks. Firstly, we introduce the basic information of artificial neural network and select the DNN structure to calculate the engineering cost price according to the characteristics of the data related to engineering cost price. Secondly, the DNN-based engineering cost price prediction model is constructed, and the two types of index systems, engineering characteristics and list item characteristics, are used as model inputs. In addition, the total quotation and each subitem engineering quotation and tax are used as model outputs by analyzing previous relevant studies. Based on this, simulation experiments are conducted on the DNN-based engineering cost price prediction model, and it is concluded from the training model that the DNN model has a better prediction effect. Among them, the relative error of total price forecast by DNN is 4.203%, and the relative error of integrated unit prices V1 and V2 is 2.98% and 4.52%, respectively, with small relative error. Finally, by reasonably adjusting the integrated unit price, the cost price of the integrated unit price and the cost price of the total offer can be calculated.

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Section: Dnnmentioning

confidence: 99%

Engineering Cost Prediction Model Based on DNN

Bingxin

Xin

Zhang

2022

Scientific Programming

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“…The multiple injection technology not only improves the combustion process, but also reduces the pollutant emissions, and optimizes the trade-off relationship between soot and NO x [32]. Figure 15 shows the soot emission with different NG mixing ratios and different fuel injection strategies.…”

Section: Soot Emissionmentioning

confidence: 99%

“…It is not difficult to see from the combustion process that the first injection time and times of diesel will have an important impact on the combustion results, and it is feasible to reduce these problems by optimizing the injection strategy (such as the number of fuel injections, time, and pressure) At present, some researchers have carried out researches on these issues. For example, Yousefi et al [32][33][34] have carried out important research from the aspect of fuel injection strategy to explore the effects of post-injection strategy on greenhouse gas emission of dual-fuel engine under high load. They found the split injection and injection timing are important.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

et al. 2021

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In this work, an effective numerical simulation method was developed and used to analyze the effects of natural gas mixing ratio and pilot-main injection, main-post injection, and pilot-main-post injection strategies on the combustion and emission characteristics of diesel engine fueled with dual fuel. Firstly, the one-dimensional calculation model and three-dimensional CFD model of the engine were established by AVL-BOOST and AVL-Fire, respectively. In addition, the simplified chemical kinetics mechanism was adopted, which could accurately calculate the combustion and emission characteristics of the engine. The results show that the cylinder pressure and heat release rate decrease with the increase of the natural gas mixing ratio and the NOx emission is reduced. When the NG mixing ratio is 50%, the NOx and CO emission are reduced by 47% and 45%, respectively. When the SODI3 is 24 °CA ATDC, the NOx emission is reduced by 29.6%. In addition, with suitable pilot-main injection and pilot-main-post injection strategies, the combustion in the cylinder can be improved and the trade-off relationship between NOx and soot can be relaxed. Thus, the proper main-post injection strategy can improve the combustion and emission characteristics, especially the reduction in the NOx and CO emissions.

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“…Detailed studies have also been carried out to better understand the patterns of DF combustion: Niki et al 11 investigated the effects of methane on pilot-fuel ignition by means of chemical-kinetics simulations and imaging diagnostics; Rochussen and Kirchen 12 characterized the reaction zone growth rate through the premixed natural gas using high-speed imaging of OH*-chemiluminescence; Rochussen et al 13 were able to identify five distinct DF combustion phases thanks to combined heat release rate and OH*-chemiluminescence reaction zone analysis. Furthermore, investigations have been conducted in order to analyze the influence of fundamentals parameters affecting DF combustion, such as: NG composition, 14,15 Exhaust Gas Recirculation (EGR), 16 diesel injection strategy (number of shots, 17 injection timing, 18 injection duration, 19 post injection strategy 20 ), injector spray included angle, 21 diesel injector nozzle hole size, 22 swirl ratio, 23 combustion chamber shape 24 ). However, the researchers still have to address some issues, in particular the poor combustion efficiency that characterizes DF operation at low loads.…”

Section: Introductionmentioning

confidence: 99%

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Mattarelli

Rinaldini

Caprioli

et al. 2021

International Journal of Engine Research

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Dual Fuel (DF) combustion can help to reduce the environmental impact of internal combustion engines, since it may provide excellent Brake Thermal Efficiency (BTE) combined with ultra-low emissions. This technique is particularly attractive when using biofuels, or fuels with a low Carbon content, such as Natural Gas (NG). Unfortunately, as engine load decreases and the homogeneous NG-air mixture tends to become very lean, the high chemical stability of NG can be a serious obstacle to the completion of combustion. As a result, BTE drops and UHC and CO emissions become very high. A possible way to address this problem could be the addition of hydrogen (H2) to the NG-air mixture. In this paper, a numerical study has been carried out on an automotive Diesel engine, modified by the authors in order to operate in both conventional Diesel combustion and DF NG-diesel mode. A previous experimental characterization of the engine is the basis for the CFD-3D modeling and calibration of the DF combustion process, using a commercial software. The effects on combustion stability and emissions of different NG-H2 mixtures (six blends with 5%, 10%, 15%, 20%, 25%, and 30% by volume of hydrogen) are numerically investigated at a low load (BMEP = 2 bar, engine speed 3000 rpm). The results of the CFD-3D simulations demonstrate that NG-H2 blends are able to decrease strongly CO, UHC, and CO2 emissions at low loads. Advantages are also found in terms of thermal efficiency and NOx emissions.

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Effect of post-injection strategy on greenhouse gas emissions of natural gas/diesel dual-fuel engine at high load conditions

Cited by 27 publications

References 33 publications

Engineering Cost Prediction Model Based on DNN

Engineering Cost Prediction Model Based on DNN

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

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Effect of post-injection strategy on greenhouse gas emissions of natural gas/diesel dual-fuel engine at high load conditions

Cited by 27 publications

References 33 publications

Engineering Cost Prediction Model Based on DNN

Engineering Cost Prediction Model Based on DNN

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

Influence of H2 enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

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Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine