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Taeyoung Kim - One of the best experts on this subject based on the ideXlab platform.
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feasibility study of using wood pyrolysis oil ethanol blended fuel with diesel Pilot Injection in a diesel engine
Fuel, 2015Co-Authors: Seokhwan Lee, Taeyoung KimAbstract:Abstract The vast stores of biomass available worldwide have the potential to replace significant amounts of petroleum fuels. Fast pyrolysis of biomass is one of several paths by which biomass can be converted to higher value products. Wood pyrolysis oil (WPO) has been regarded as an alternative to petroleum fuel for use in diesel engines. However, the application of WPO in diesel engines is constrained by the poor fuel properties of WPO, such as low energy density, high acidity, high viscosity, and low cetane number. One possible method by which these shortcomings may be circumvented is to co-fire WPO with other petroleum fuels. WPO has poor miscibility with petroleum fuel oils; the most suitable candidate fuel for direct fuel mixing is ethanol. Early mixing with ethanol has the added benefit of significantly improving the storage and handling properties of WPO. For separate Injection co-firing, a WPO–ethanol blended fuel can be fired through diesel Pilot Injection in a dual-Injection diesel engine. In this study, we examined the performance and emission characteristics of a dual-Injection diesel engine fueled with diesel (Pilot Injection) and WPO–ethanol blended fuel (main Injection) experimentally. Results showed that although stable engine operation was possible with dual Injection, the indicated fuel conversion efficiency was slightly lower than that of diesel combustion. Regarding exhaust emissions, HC and CO emissions were slightly increased, while NOx and PM emissions were significantly decreased due to the high water content and oxygen content in the WPO–ethanol blended fuel.
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Feasibility study of using wood pyrolysis oil–ethanol blended fuel with diesel Pilot Injection in a diesel engine
Fuel, 2015Co-Authors: Seokhwan Lee, Taeyoung KimAbstract:Abstract The vast stores of biomass available worldwide have the potential to replace significant amounts of petroleum fuels. Fast pyrolysis of biomass is one of several paths by which biomass can be converted to higher value products. Wood pyrolysis oil (WPO) has been regarded as an alternative to petroleum fuel for use in diesel engines. However, the application of WPO in diesel engines is constrained by the poor fuel properties of WPO, such as low energy density, high acidity, high viscosity, and low cetane number. One possible method by which these shortcomings may be circumvented is to co-fire WPO with other petroleum fuels. WPO has poor miscibility with petroleum fuel oils; the most suitable candidate fuel for direct fuel mixing is ethanol. Early mixing with ethanol has the added benefit of significantly improving the storage and handling properties of WPO. For separate Injection co-firing, a WPO–ethanol blended fuel can be fired through diesel Pilot Injection in a dual-Injection diesel engine. In this study, we examined the performance and emission characteristics of a dual-Injection diesel engine fueled with diesel (Pilot Injection) and WPO–ethanol blended fuel (main Injection) experimentally. Results showed that although stable engine operation was possible with dual Injection, the indicated fuel conversion efficiency was slightly lower than that of diesel combustion. Regarding exhaust emissions, HC and CO emissions were slightly increased, while NOx and PM emissions were significantly decreased due to the high water content and oxygen content in the WPO–ethanol blended fuel.
Seokhwan Lee - One of the best experts on this subject based on the ideXlab platform.
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feasibility study of using wood pyrolysis oil ethanol blended fuel with diesel Pilot Injection in a diesel engine
Fuel, 2015Co-Authors: Seokhwan Lee, Taeyoung KimAbstract:Abstract The vast stores of biomass available worldwide have the potential to replace significant amounts of petroleum fuels. Fast pyrolysis of biomass is one of several paths by which biomass can be converted to higher value products. Wood pyrolysis oil (WPO) has been regarded as an alternative to petroleum fuel for use in diesel engines. However, the application of WPO in diesel engines is constrained by the poor fuel properties of WPO, such as low energy density, high acidity, high viscosity, and low cetane number. One possible method by which these shortcomings may be circumvented is to co-fire WPO with other petroleum fuels. WPO has poor miscibility with petroleum fuel oils; the most suitable candidate fuel for direct fuel mixing is ethanol. Early mixing with ethanol has the added benefit of significantly improving the storage and handling properties of WPO. For separate Injection co-firing, a WPO–ethanol blended fuel can be fired through diesel Pilot Injection in a dual-Injection diesel engine. In this study, we examined the performance and emission characteristics of a dual-Injection diesel engine fueled with diesel (Pilot Injection) and WPO–ethanol blended fuel (main Injection) experimentally. Results showed that although stable engine operation was possible with dual Injection, the indicated fuel conversion efficiency was slightly lower than that of diesel combustion. Regarding exhaust emissions, HC and CO emissions were slightly increased, while NOx and PM emissions were significantly decreased due to the high water content and oxygen content in the WPO–ethanol blended fuel.
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Feasibility study of using wood pyrolysis oil–ethanol blended fuel with diesel Pilot Injection in a diesel engine
Fuel, 2015Co-Authors: Seokhwan Lee, Taeyoung KimAbstract:Abstract The vast stores of biomass available worldwide have the potential to replace significant amounts of petroleum fuels. Fast pyrolysis of biomass is one of several paths by which biomass can be converted to higher value products. Wood pyrolysis oil (WPO) has been regarded as an alternative to petroleum fuel for use in diesel engines. However, the application of WPO in diesel engines is constrained by the poor fuel properties of WPO, such as low energy density, high acidity, high viscosity, and low cetane number. One possible method by which these shortcomings may be circumvented is to co-fire WPO with other petroleum fuels. WPO has poor miscibility with petroleum fuel oils; the most suitable candidate fuel for direct fuel mixing is ethanol. Early mixing with ethanol has the added benefit of significantly improving the storage and handling properties of WPO. For separate Injection co-firing, a WPO–ethanol blended fuel can be fired through diesel Pilot Injection in a dual-Injection diesel engine. In this study, we examined the performance and emission characteristics of a dual-Injection diesel engine fueled with diesel (Pilot Injection) and WPO–ethanol blended fuel (main Injection) experimentally. Results showed that although stable engine operation was possible with dual Injection, the indicated fuel conversion efficiency was slightly lower than that of diesel combustion. Regarding exhaust emissions, HC and CO emissions were slightly increased, while NOx and PM emissions were significantly decreased due to the high water content and oxygen content in the WPO–ethanol blended fuel.
Haozhong Huang - One of the best experts on this subject based on the ideXlab platform.
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Effects of pine oil additive and Pilot Injection strategies on energy distribution, combustion and emissions in a diesel engine at low-load condition
Applied Energy, 2019Co-Authors: Haozhong Huang, Rong Huang, Xiaoyu Guo, Mingzhang Pan, Wenwen Teng, Yingjie ChenAbstract:Abstract Pine oil is mainly produced from the pine tree, which has some prominent fuel-related properties, such as lower boiling point and viscosity than those of the pure diesel. Particularly, its low heating value is similar to that of diesel. In addition, pine oil and diesel can be mixed in any ratio, and the engine can directly burn the pine oil/diesel mixtures without any further modification. Therefore, pine oil is considered to be a promising additive to diesel fuel. However, when pine oil is fueled in a diesel engine via single Injection the engine NOX emissions deteriorate. In this present study, the effects of Pilot Injection (PI) strategies, including Pilot Injection rate (PIR) and Pilot-main interval (PMI) on energy distribution, emissions and combustion were explored in a diesel engine fueling with diesel/pine oil mixtures at low-load condition. Three test fuels were pure diesel (denoted as P0), a mixture of 80% diesel and 20% pine oil (denoted as P20), and 60% diesel and 40% pine oil (denoted as P40), respectively. The results showed that, after utilizing the PI strategies, the peaks of in-cylinder pressure of the three fuels increased compared to single Injection, while the maximum pressure rise rates decreased along with an increase in the break thermal efficiency (BTE). After blending pine oil in pure diesel, both the soot and CO emissions were reduced, although the NOX and THC emissions slightly increased. The small PMI strategies could reduce the energy loss of THC, CO emissions and friction, and improve BTE. However, the soot emission increased. At low-load condition, when fueling with P20 blended fuel and using small PMI strategies, the system could achieve higher thermal efficiency and lower soot-NOX emissions than the strategy employing pure diesel.
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influence of n butanol diesel pode3 4 fuels coupled Pilot Injection strategy on combustion and emission characteristics of diesel engine
Fuel, 2019Co-Authors: Haozhong Huang, Rong Huang, Wenwen Teng, Chenzhong Zhou, Haifeng Liu, Mingzhang PanAbstract:Abstract Experiments in regard to influence of n-butanol, diesel and PODE3-4 hybrid fuel coupled pre-Injection strategy on combustion and emission characteristics of diesel engine were conducted at 20% EGR (exhaust gas recirculation) rates. BD20 that composed of 20% n-butanol and 80% conventional diesel (v/v), PD20 that composed of 20% PODE3-4 and 80% conventional diesel (v/v), BDP20 that composed of 20% PODE3-4 and 80% BD20 (v/v), and pure diesel fuel (D100) were tested. The results showed that compared to a single Injection route, Pilot Injection route lowers the MPRR (Maximum Pressure Rise Rate). By decreasing Pilot Injection interval or increasing the Pilot Injection rate, MPRR is further reduced. MPRR can be reduced by blending PODE3-4, and the descending sequence of MPRR for the four fuels is: BD20 > BDP20 > D100 > PD20. Moreover, adding the oxygenated fuel into diesel causes the NOx emission increase, and the change of Pilot Injection strategy impacts little on NOx emission of all the four fuels. The descending sequence of soot emission is: D100 > BD20 > PD20 > BDP20, where soot emission of D100 increases as Pilot Injection rate increases or decreases due to the increases of Pilot Injection interval, while emissions of other remaining three blends are insensitive to Pilot Injection strategy. The accretion of PODE3-4 in the D100 or BD20 shows a significant downtrend in CO emission, where that of BDP20 is the lowest; CO and HC emissions of the four fuels increase due to the increases of Pilot Injection interval, and enhancing the Pilot rate results in reduction in HC emissions of PD20 and BDP20, but the change of CO emission is not obvious. By introducing the Pilot Injection, the total particle number concentration of pure diesel increases, but with modest effect on those of the blends. Regardless of single Injection or Pilot Injection, total particle number concentrations of multi-fuels are significantly lowered compared with that of D100.
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Assessment of Pilot Injection strategies and n-pentanol additive effects on engine performance and emissions
Fuel, 2019Co-Authors: Rong Huang, Haozhong Huang, Xiaoyu Guo, Mingzhang Pan, Te Wang, Han LeiAbstract:Abstract Biodiesel is a environmentally friendly, biodegradable and renewable alternative fuel, which is widely used around the world. However, the higher viscosity and NOX emissions are its main drawbacks. n-Pentanol has lower viscosity, higher oxygen content and volatility as compared with biodiesel, which is a promising additive for biodiesel/diesel blends. In this work, the influences of Pilot Injection (PI) strategies included Pilot-main interval (PMI) and Pilot Injection rate (PIR), and n-pentanol additive on emission characteristics and combustion behaviors of a diesel engine at medium load were investigated. The three test fuels including diesel (D100), a mixture of 20% biodiesel and 80% diesel (BD20), and 20% n-pentanol, 16% biodiesel and 64% diesel (BDP20), respectively. The results indicated that, compared with single Injection (SI), the peak of main Injection heat release rate reduced and brake thermal efficiency (BTE) increased when using PI strategies. Adding n-pentanol to biodiesel/diesel (BD) blends resulted in an increase in maximum in-cylinder pressure, but BTE decreased. After utilizing PI strategies, the NOX emissions decreased significantly, but the soot, CO and THC emissions increased. As the PIR and PMI increased, the accumulation mode particles and total particle mass concentrations increased. Compared with SI, the ratio of sub-25 nm particles of BDP20 decreased with the use of PI strategies. The combination of n-pentanol additive and small PMI strategies could achieve lower total particles number concentration and smaller geometric mean diameter when compared with pure diesel.
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comparative study of effects of Pilot Injection and fuel properties on low temperature combustion in diesel engine under a medium egr rate
Applied Energy, 2016Co-Authors: Haozhong Huang, Qingxin Wang, Cheng Shi, Qingsheng Liu, Chengzhong ZhouAbstract:Abstract Comparative study of effects of Pilot Injection strategy and properties of fuels on the spray, combustion and emissions of a four-cylinder diesel engine was investigated under an intermediate exhaust gas recirculation (EGR) ratio. Four different fuels including pure diesel (D100) and three blended fuels consisting of diesel/gasoline (in a volume ratio of 70:30, D70G30), diesel/ n -butanol (in a volume ratio of 70:30, D70B30) and diesel/gasoline/ n -butanol (in a volume ratio of 70:15:15, D70G15B15) were investigated. The Pilot Injection strategies were accomplished by varying the Pilot Injection ratios and the Pilot-main intervals. The results showed that, although the addition of gasoline or n -butanol to diesel had little influence on the spray characteristics, it can greatly reduce soot emissions and lead to an increase in maximum pressure rise rate (MPRR) and brake specific fuel consumption (BSFC). Using the Pilot Injection strategy with a larger Pilot Injection ratio and a shorter Pilot-main interval can effectively reduce MPRR. A smaller Pilot-main interval can remarkably reduce BSFC. Compared to single Injection, Pilot Injection results showed that soot, THC and carbon monoxide (CO) emissions for four fuels increased, while the corresponding NO x emissions decreased. Both the decrease of Pilot Injection ratio and increase of Pilot-main interval can lead to a decline in soot emissions. Nevertheless, the addition of gasoline or n -butanol to diesel can greatly offset the deterioration of soot emissions, induced by the adoption of Pilot Injection strategy. Additionally, compared to D100, the variations in soot emissions from the combustion of three blended fuels are less sensitive to variations in Pilot Injection ratios and Pilot-main intervals. For all the studied fuels, effects of Pilot Injection ratios on NO x emissions are less obvious than the effects induced by the Pilot-main interval. A decrease in Pilot-main interval can further reduce the NO x emissions. For all the studied fuels, decrease in Pilot Injection ratios or Pilot-main intervals can reduce the emissions of THC and CO, whereas the difference among four fuels is quite small. However, the Pilot-main interval shows a more remarkable effect on the THC emissions than the Pilot interval ratio.
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investigation on the effects of Pilot Injection on low temperature combustion in high speed diesel engine fueled with n butanol diesel blends
Energy Conversion and Management, 2015Co-Authors: Haozhong Huang, Qingsheng Liu, Ruzhi Yang, Tianru Zhu, Ruiqing Zhao, Yaodong WangAbstract:The effect of Pilot Injection timing and Pilot Injection mass on combustion and emission characteristics under medium exhaust gas recirculation (EGR (25%)) condition were experimentally investigated in high-speed diesel engine. Diesel fuel (B0), two blends of butanol and diesel fuel denoted as B20 (20% butanol and 80% diesel in volume), and B30 (30% butanol and 70% diesel in volume) were tested. The results show that, for all fuels, when advancing the Pilot Injection timing, the peak value of heat release rate decreases for pre-Injection fuel, but increases slightly for the main-Injection fuel. Moreover, the in-cylinder pressure peak value reduces with the rise of maximum pressure rise rate (MPRR), while NOx and soot emissions reduce. Increasing the Pilot Injection fuel mass, the peak value of heat release rate for pre-injected fuel increases, but for the main-Injection, the peak descends, and the in-cylinder pressure peak value and NOx emissions increase, while soot emission decreases at first and then increases. Blending n-butanol in diesel improves soot emissions. When Pilot Injection is adopted, the increase of n-butanol ratio causes the MPRR increasing and the crank angle location for 50% cumulative heat release (CA50) advancing, as well as NOx and soot emissions decreasing. The simulation of the combustion of n-butanol–diesel fuel blends, which was based on the n-heptane–n-butanol–PAH–toluene mixing mechanism, demonstrated that the addition of n-butanol consumed OH free radicals was able to delay the ignition time.
Chang Sik Lee - One of the best experts on this subject based on the ideXlab platform.
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effects of biobutanol and biobutanol diesel blends on combustion and emission characteristics in a passenger car diesel engine with Pilot Injection strategies
Energy Conversion and Management, 2016Co-Authors: Hyuntae Yun, Kibong Choi, Chang Sik LeeAbstract:Abstract In this study, we investigated the effect of biobutanol and biobutanol–diesel blends on the combustion and emission characteristics in a four-cylinder compression ignition engine using Pilot Injection strategies. The test fuels were a mixture of 10% biobutanol and 90% conventional diesel (Bu10), 20% biobutanol and 80% diesel (Bu20), and 100% diesel fuel (Bu0) based on mass. To study the combustion and emission characteristics of the biobutanol blended fuels, we carried out experimental investigations under various Pilot Injection timings from BTDC 20° to BTDC 60° with constant main Injection timing. As the butanol content in the blended fuel increased, the experimental results indicated that the ignition delay was longer than that of diesel fuel for all Pilot Injection timings. Also, the indicated specific fuel consumption (ISFC) of the blended fuels was higher than that of diesel at all test conditions. However, the exhaust temperature was lower than that of diesel at all Injection timings. Nitrogen oxide (NOx), carbon monoxide (CO) and soot from Bu20 were lower than those from diesel fuel at all test conditions and hydrocarbons (HC) were higher than that from diesel.
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Effects of biobutanol and biobutanol–diesel blends on combustion and emission characteristics in a passenger car diesel engine with Pilot Injection strategies
Energy Conversion and Management, 2016Co-Authors: Hyuntae Yun, Kibong Choi, Chang Sik LeeAbstract:Abstract In this study, we investigated the effect of biobutanol and biobutanol–diesel blends on the combustion and emission characteristics in a four-cylinder compression ignition engine using Pilot Injection strategies. The test fuels were a mixture of 10% biobutanol and 90% conventional diesel (Bu10), 20% biobutanol and 80% diesel (Bu20), and 100% diesel fuel (Bu0) based on mass. To study the combustion and emission characteristics of the biobutanol blended fuels, we carried out experimental investigations under various Pilot Injection timings from BTDC 20° to BTDC 60° with constant main Injection timing. As the butanol content in the blended fuel increased, the experimental results indicated that the ignition delay was longer than that of diesel fuel for all Pilot Injection timings. Also, the indicated specific fuel consumption (ISFC) of the blended fuels was higher than that of diesel at all test conditions. However, the exhaust temperature was lower than that of diesel at all Injection timings. Nitrogen oxide (NOx), carbon monoxide (CO) and soot from Bu20 were lower than those from diesel fuel at all test conditions and hydrocarbons (HC) were higher than that from diesel.
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Effect of Pilot Injection on Combustion and Exhaust Emissions Characteristics in a Biodiesel Fueled Diesel Engine
Journal of The Korean Society of Combustion, 2011Co-Authors: Kyusoo Jeong, D Lee, Chang Sik LeeAbstract:The purpose of this study was to analyze the effect of Pilot Injection strategy on the combustion and emissions characteristics in a four cylinder common-rail direct Injection diesel engine fueled with biodiesel(soybean oil) blend. The tested fuel was mixed of 20% biodiesel and 80% ULSD (Ultra low sulfur diesel) by volume ratio. The experiments were performed under two load conditions, and results were compared with those of single Injection. The experimental results showed that the ignition delay of BD20 was shorter than compared to that of ULSD in the case of low load condition. Also, the fuel consumption of BD20 was more higher than that of ULSD. Fuel consumption by applied Pilot Injection strategy were generally decreased compared with that of single Injection. In the case of Pilot Injection, the exhaust emissions such as CO and HC emissions were decreased compared to the single Injection.
Minggao Ouyang - One of the best experts on this subject based on the ideXlab platform.
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effects of Pilot fuel quantity on the emissions characteristics of a cng diesel dual fuel engine with optimized Pilot Injection timing
Applied Energy, 2013Co-Authors: Fuyuan Yang, Hewu Wang, Minggao OuyangAbstract:For CNG/diesel dual fuel engines, the effects of Pilot fuel quantity and Injection timing are noticeable and significant. In this study, the emission characteristics of a CNG–diesel dual fuel engine with different Pilot diesel fuel quantity and optimized Pilot Injection timing were investigated. The CO emission levels under dual fuel mode are considerably higher than that under normal diesel operation modes even at high load, which indicated that there exist some flame extinction regions. Dual fuel mode reduces NOx emissions by 30% averagely in comparison to diesel mode. That is because most of the fuel is burned under lean premixed conditions which result in lower local temperature. The unburned HC emissions under dual-fuel mode are obviously higher than that of the normal diesel mode, especially at low to medium loads. And around 90% of the THC emissions were unburned methane, which means the flame does not propagate throughout the charge. THC emissions reduce significantly with the increase of the Pilot diesel quantity. Thanks to the premixed nature of the combustion mode and the methane molecular structure, the PM emission is reduced obviously under dual fueling condition. The PM emission is increased with the increase of the Pilot fuel quantity.
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Effects of Pilot fuel quantity on the emissions characteristics of a CNG/diesel dual fuel engine with optimized Pilot Injection timing
Applied Energy, 2013Co-Authors: Jie Liu, Fuyuan Yang, Hewu Wang, Minggao Ouyang, Shougang HaoAbstract:For CNG/diesel dual fuel engines, the effects of Pilot fuel quantity and Injection timing are noticeable and significant. In this study, the emission characteristics of a CNG–diesel dual fuel engine with different Pilot diesel fuel quantity and optimized Pilot Injection timing were investigated. The CO emission levels under dual fuel mode are considerably higher than that under normal diesel operation modes even at high load, which indicated that there exist some flame extinction regions. Dual fuel mode reduces NOx emissions by 30% averagely in comparison to diesel mode. That is because most of the fuel is burned under lean premixed conditions which result in lower local temperature. The unburned HC emissions under dual-fuel mode are obviously higher than that of the normal diesel mode, especially at low to medium loads. And around 90% of the THC emissions were unburned methane, which means the flame does not propagate throughout the charge. THC emissions reduce significantly with the increase of the Pilot diesel quantity. Thanks to the premixed nature of the combustion mode and the methane molecular structure, the PM emission is reduced obviously under dual fueling condition. The PM emission is increased with the increase of the Pilot fuel quantity.