The Experts below are selected from a list of 3492 Experts worldwide ranked by ideXlab platform
Chunde Yao - One of the best experts on this subject based on the ideXlab platform.
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study of the characteristics of pm and the correlation of soot and smoke opacity on the Diesel methanol dual fuel engine
Applied Thermal Engineering, 2019Co-Authors: Chao Chen, Chunde Yao, Anren Yao, Bin Wang, Jun Feng, Luyu FengAbstract:Abstract Methanol is regarded as an alternative fuel of Diesel for reducing the particulate matter emissions on Diesel engines. However, recent studies reveal that methanol has the different effects on particulate matter characteristics at high loads. In order to reduce particulate matter emissions further within the full operating range of the engine, the characteristics of particulate matter and the correlation between soot and smoke opacity were investigated on a turbocharged and intercooled Diesel engine under Diesel/methanol dual fuel mode. During the experiment, particulate characteristics are primarily exhibited by the characteristics of soot and particulate number. Results show that the engine-out soot and particulate number emissions increase with the increase of methanol substitution percent under high intake temperature at high loads. On the contrary, the engine-out soot and particulate number decrease with the increase of methanol substitution percent under low intake temperature at high loads. There is an applicable scope of methanol substitution percent that effectively reduces soot and particulate number emissions. Methanol substitution percent which is larger than 20% has a significant effect on the decrease of soot and particulate number. At low and medium loads, the effect of methanol substitution percent on soot and particulate number emissions is dependent on the start of injection. The effect of methanol substitution percent on the decrease of particles strengthens as the start of injection is away from the top dead center. The inflection point of particulate number and soot emissions moves forward with the increased methanol substitution percent. Compared to pure Diesel mode, the strong correlation between soot and smoke opacity does not exist on Diesel/methanol dual fuel mode. However, the correlation between soot and smoke opacity comes back in usage of the Diesel Oxidation Catalyst or exhaust gas recirculation on Diesel/methanol dual fuel mode. Most of nitrogen dioxide and unburned hydrocarbons are reduced by the Diesel Oxidation Catalyst on Diesel/methanol dual fuel mode.
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reduction of pm emissions from a heavy duty Diesel engine with Diesel methanol dual fuel
Fuel, 2014Co-Authors: Peng Geng, Chunde Yao, Quangang Wang, Lijiang Wei, Junheng Liu, Wang Pan, Jianyun WangAbstract:Abstract The effects of Diesel/methanol dual fuel (DMDF) combustion, Diesel Oxidation Catalyst (DOC) and intake air temperature on dry-soot and PM (particulate matter) emissions were investigated. Experiments were conducted on a 6-cylinder turbo-charged, inter-cooling HD (heavy duty) Diesel engine modified to Diesel/methanol dual fuel combustion mode. The pressurized methanol was induced into the intake manifold with six injectors and mixed with boost fresh air to form homogeneous mixtures and then ignited by pilot Diesel in the cylinder. The amount of injected methanol was varied in accordance with engine power output while the amount of Diesel fuel was remained constant under different operation conditions. Experimental results show that at low and medium loads, there is a significant decrease in the dry-soot emission in DMDF mode before the DOC, but a little increase at high load. An important phenomenon was observed that the mass and number concentrations of particulate matter significantly decrease at low and medium loads, due to the increase in fuel burned in the premixed mode and a reduction in Diesel fuel involved, while they increase when the tested engine operates on the high engine condition, due to the spontaneous combustion of methanol and a reduction in oxygen for Diesel in cylinder. After the DOC, the particulate mass and number concentrations are significantly reduced at all engine loads. Moreover, the temperature of intake air decreases with the increase of methanol injection, and the particulate number and mass concentrations in DMDF mode decrease with the decrease of the intake air temperature.
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experimental investigation of regulated and unregulated emissions from a Diesel engine fueled with euro v Diesel fuel and fumigation methanol
Atmospheric Environment, 2010Co-Authors: Chun Shun Cheung, Tat Leung Chan, Zhuozhi Zhang, Chunde YaoAbstract:Abstract Experiments were conducted on a four-cylinder direct-injection Diesel engine with part of the engine load taken up by fumigation methanol injected into the air intake of each cylinder to investigate the regulated and unregulated gaseous emissions and particulate emission of the engine under five engine loads at an engine speed of 1920 rev min−1. The fumigation methanol was injected to top up 10%, 20% and 30% of the engine load under different engine operating conditions. The experimental results show that at low engine loads, the brake thermal efficiency (BTE) decreases with increase in fumigation methanol; but at high engine loads, the BTE is not significantly affected by fumigation methanol. The fumigation methanol results in significant increase in hydrocarbon (HC), carbon monoxide (CO) and nitrogen dioxide (NO2) emissions, but decrease in nitrogen oxides (NOx). For the unregulated gaseous emissions, unburned methanol, formaldehyde and BTX (benzene, toluene and xylene) emissions increase but ethyne, ethene and 1,3-butadiene emissions decrease. Particulate mass and number concentrations also decrease with increase in fumigation methanol. A Diesel Oxidation Catalyst (DOC) is found to reduce significantly most of the pollutants, including the air toxics, when the exhaust gas temperature is sufficiently high.
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experimental investigation on regulated and unregulated emissions of a Diesel methanol compound combustion engine with and without Diesel Oxidation Catalyst
Science of The Total Environment, 2010Co-Authors: Zhiman Zhang, Chun Shun Cheung, Tat Leung Chan, Chunde YaoAbstract:Abstract The use of methanol in combination with Diesel fuel is an effective measure to reduce particulate matter (PM) and nitrogen oxides (NOx) emissions from in-use Diesel vehicles. In this study, a Diesel/methanol compound combustion (DMCC) scheme was proposed and a 4-cylinder naturally-aspirated direct-injection Diesel engine modified to operate on the proposed combustion scheme. The effect of DMCC and Diesel Oxidation Catalyst (DOC) on the regulated emissions of total hydrocarbons (THC), carbon monoxide (CO), NOx and PM was investigated based on the Japanese 13 Mode test cycle. Certain unregulated emissions, including methane, ethyne, ethene, 1,3-butadiene, BTX (benzene, toluene, xylene), unburned methanol and formaldehyde were also evaluated based on the same test cycle. In addition, the soluble organic fraction (SOF) in the particulate and the particulate number concentration and size distribution were investigated at certain selected modes of operation. The results show that the DMCC scheme can effectively reduce NOx, particulate mass and number concentrations, ethyne, ethene and 1,3-butadiene emissions but significantly increase the emissions of THC, CO, NO2, BTX, unburned methanol, formaldehyde, and the proportion of SOF in the particles. After the DOC, the emission of THC, CO, NO2, as well as the unregulated gaseous emissions, can be significantly reduced when the exhaust gas temperature is sufficiently high while the particulate mass concentration is further reduced due to Oxidation of the SOF.
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emission reduction from Diesel engine using fumigation methanol and Diesel Oxidation Catalyst
Science of The Total Environment, 2009Co-Authors: Zhuozhi Zhang, Chun Shun Cheung, Tat Leung Chan, Chunde YaoAbstract:This study is aimed to investigate the combined application of fumigation methanol and a Diesel Oxidation Catalyst for reducing emissions of an in-use Diesel engine. Experiments were performed on a 4-cylinder naturally-aspirated direct-injection Diesel engine operating at a constant speed of 1800 rev/min for five engine loads. The experimental results show that at low engine loads, the brake thermal efficiency decreases with increase in fumigation methanol; but at high loads, it slightly increases with increase in fumigation methanol. The fumigation method results in a significant increase in hydrocarbon (HC), carbon monoxide (CO), and nitrogen dioxide (NO(2)) emissions, but decrease in nitrogen oxides (NO(x)), smoke opacity and the particulate mass concentration. For the submicron particles, the total number of particles decreases. In all cases, there is little change in geometrical mean diameter of the particles. After catalytic conversion, the HC, CO, NO(2), particulate mass and particulate number concentrations were significantly reduced at medium to high engine loads; while the geometrical mean diameter of the particles becomes larger. Thus, the combined use of fumigation methanol and Diesel Oxidation Catalyst leads to a reduction of HC, CO, NO(x), particulate mass and particulate number concentrations at medium to high engine loads.
Antonio Garcia - One of the best experts on this subject based on the ideXlab platform.
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performance of a Diesel Oxidation Catalyst under Diesel gasoline reactivity controlled compression ignition combustion conditions
Energy Conversion and Management, 2019Co-Authors: Pedro Piqueras, Antonio Garcia, Javier Monsalveserrano, Maria Jose RuizAbstract:This research has been partially supported by FEDER and the Government of Spain through project TRA2016-79185-R. Additionally, the Ph.D. student Maria Jose Ruiz has been funded by a grant from Universitat Politecnica de Valencia with reference number FPI-2018S2-10.
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experimental investigation on the efficiency of a Diesel Oxidation Catalyst in a medium duty multi cylinder rcci engine
Energy Conversion and Management, 2018Co-Authors: Jesus Benajes, Antonio Garcia, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion is one of the most promising low temperature combustion (LTC) techniques, as it is able to provide ultra-low NOx and soot emissions together with higher thermal efficiency than conventional Diesel combustion (CDC) in a wide range of operating conditions. However, the unburned hydrocarbon (UHC) and carbon monoxide (CO) emission levels are orders of magnitude higher than CDC, which can result in a major problem for implementing the RCCI concept in real engines. In this sense, the high levels of UHC and CO emissions together with the low exhaust temperatures during RCCI operation could compromise the Diesel Oxidation Catalyst (DOC) conversion efficiency. The objective of this work is to evaluate the efficiency of a conventional DOC in oxidizing the UHC and CO emissions from RCCI combustion. To do this, a medium-duty multi-cylinder Diesel engine equipped with its original after treatment system has been used. First, the DOC conversion efficiency is evaluated under some steady-state conditions. Later, the influence of the thermal inertia on the DOC response has been evaluated by means of transient tests. In this sense, different engine load-speed steps as well some simplified conditions from the worldwide harmonized vehicle cycle (WHVC) and the supplemental engine transient cycle (SET) are evaluated. In steady-state conditions, with DOC-inlet temperatures of 200–300 °C, the results show conversion efficiencies of 100% for CO and 85–95% for HC. At 10% and 25% load, the DOC-outlet UHC levels are unacceptable considering the EURO VI regulation, while at 50% load the tailpipe emissions fulfill the emissions standard. The results in transient conditions are more promising thanks to effect of the thermal inertia, showing 100% conversion efficiency for CO and greater than 90% for UHC during large periods of engine operation.
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sizing a conventional Diesel Oxidation Catalyst to be used for rcci combustion under real driving conditions
Applied Thermal Engineering, 2018Co-Authors: Antonio Garcia, Pedro Piqueras, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion has demonstrated to be able to avoid the NOx-soot trade-off appearing during conventional Diesel combustion (CDC), with similar or better thermal efficiency than CDC under a wide variety of engine platforms. However, a major challenge of this concept comes from the high hydrocarbon (HC) and carbon monoxide (CO) emission levels, which are orders of magnitude greater than CDC, and similar to those of port fuel injected (PFI) gasoline engines. The high HC and CO emissions levels combined with the low exhaust temperatures during RCCI operation could present a challenge for the current exhaust aftertreatment technologies. The objective of this work is to evaluate the potential of a conventional Diesel Oxidation Catalyst (DOC) for light-duty Diesel engines when operating under dual-fuel RCCI Diesel-gasoline combustion and to define its necessary size to accomplish with the current emissions standards. For this purpose, a 1-D model has been developed and calibrated through gas emissions measurements upstream and downstream the DOC under different engine steady-state conditions. After that, the DOC response in transient conditions has been evaluated by means of vehicle systems simulations under different driving cycles representative of the homologation procedures currently in force around the world. The results show that the HC and CO levels at the DOC outlet are unacceptable considering the different emissions regulations. By this reason, a dedicated study to define the DOC size needed to accomplish the different emissions standards is carried out. The results suggest that, the DOC volume needed to fulfill the type approval regulation limits ranges from four to six times the original volume.
Javier Monsalveserrano - One of the best experts on this subject based on the ideXlab platform.
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performance of a Diesel Oxidation Catalyst under Diesel gasoline reactivity controlled compression ignition combustion conditions
Energy Conversion and Management, 2019Co-Authors: Pedro Piqueras, Antonio Garcia, Javier Monsalveserrano, Maria Jose RuizAbstract:This research has been partially supported by FEDER and the Government of Spain through project TRA2016-79185-R. Additionally, the Ph.D. student Maria Jose Ruiz has been funded by a grant from Universitat Politecnica de Valencia with reference number FPI-2018S2-10.
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experimental investigation on the efficiency of a Diesel Oxidation Catalyst in a medium duty multi cylinder rcci engine
Energy Conversion and Management, 2018Co-Authors: Jesus Benajes, Antonio Garcia, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion is one of the most promising low temperature combustion (LTC) techniques, as it is able to provide ultra-low NOx and soot emissions together with higher thermal efficiency than conventional Diesel combustion (CDC) in a wide range of operating conditions. However, the unburned hydrocarbon (UHC) and carbon monoxide (CO) emission levels are orders of magnitude higher than CDC, which can result in a major problem for implementing the RCCI concept in real engines. In this sense, the high levels of UHC and CO emissions together with the low exhaust temperatures during RCCI operation could compromise the Diesel Oxidation Catalyst (DOC) conversion efficiency. The objective of this work is to evaluate the efficiency of a conventional DOC in oxidizing the UHC and CO emissions from RCCI combustion. To do this, a medium-duty multi-cylinder Diesel engine equipped with its original after treatment system has been used. First, the DOC conversion efficiency is evaluated under some steady-state conditions. Later, the influence of the thermal inertia on the DOC response has been evaluated by means of transient tests. In this sense, different engine load-speed steps as well some simplified conditions from the worldwide harmonized vehicle cycle (WHVC) and the supplemental engine transient cycle (SET) are evaluated. In steady-state conditions, with DOC-inlet temperatures of 200–300 °C, the results show conversion efficiencies of 100% for CO and 85–95% for HC. At 10% and 25% load, the DOC-outlet UHC levels are unacceptable considering the EURO VI regulation, while at 50% load the tailpipe emissions fulfill the emissions standard. The results in transient conditions are more promising thanks to effect of the thermal inertia, showing 100% conversion efficiency for CO and greater than 90% for UHC during large periods of engine operation.
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sizing a conventional Diesel Oxidation Catalyst to be used for rcci combustion under real driving conditions
Applied Thermal Engineering, 2018Co-Authors: Antonio Garcia, Pedro Piqueras, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion has demonstrated to be able to avoid the NOx-soot trade-off appearing during conventional Diesel combustion (CDC), with similar or better thermal efficiency than CDC under a wide variety of engine platforms. However, a major challenge of this concept comes from the high hydrocarbon (HC) and carbon monoxide (CO) emission levels, which are orders of magnitude greater than CDC, and similar to those of port fuel injected (PFI) gasoline engines. The high HC and CO emissions levels combined with the low exhaust temperatures during RCCI operation could present a challenge for the current exhaust aftertreatment technologies. The objective of this work is to evaluate the potential of a conventional Diesel Oxidation Catalyst (DOC) for light-duty Diesel engines when operating under dual-fuel RCCI Diesel-gasoline combustion and to define its necessary size to accomplish with the current emissions standards. For this purpose, a 1-D model has been developed and calibrated through gas emissions measurements upstream and downstream the DOC under different engine steady-state conditions. After that, the DOC response in transient conditions has been evaluated by means of vehicle systems simulations under different driving cycles representative of the homologation procedures currently in force around the world. The results show that the HC and CO levels at the DOC outlet are unacceptable considering the different emissions regulations. By this reason, a dedicated study to define the DOC size needed to accomplish the different emissions standards is carried out. The results suggest that, the DOC volume needed to fulfill the type approval regulation limits ranges from four to six times the original volume.
Pedro Piqueras - One of the best experts on this subject based on the ideXlab platform.
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performance of a Diesel Oxidation Catalyst under Diesel gasoline reactivity controlled compression ignition combustion conditions
Energy Conversion and Management, 2019Co-Authors: Pedro Piqueras, Antonio Garcia, Javier Monsalveserrano, Maria Jose RuizAbstract:This research has been partially supported by FEDER and the Government of Spain through project TRA2016-79185-R. Additionally, the Ph.D. student Maria Jose Ruiz has been funded by a grant from Universitat Politecnica de Valencia with reference number FPI-2018S2-10.
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sizing a conventional Diesel Oxidation Catalyst to be used for rcci combustion under real driving conditions
Applied Thermal Engineering, 2018Co-Authors: Antonio Garcia, Pedro Piqueras, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion has demonstrated to be able to avoid the NOx-soot trade-off appearing during conventional Diesel combustion (CDC), with similar or better thermal efficiency than CDC under a wide variety of engine platforms. However, a major challenge of this concept comes from the high hydrocarbon (HC) and carbon monoxide (CO) emission levels, which are orders of magnitude greater than CDC, and similar to those of port fuel injected (PFI) gasoline engines. The high HC and CO emissions levels combined with the low exhaust temperatures during RCCI operation could present a challenge for the current exhaust aftertreatment technologies. The objective of this work is to evaluate the potential of a conventional Diesel Oxidation Catalyst (DOC) for light-duty Diesel engines when operating under dual-fuel RCCI Diesel-gasoline combustion and to define its necessary size to accomplish with the current emissions standards. For this purpose, a 1-D model has been developed and calibrated through gas emissions measurements upstream and downstream the DOC under different engine steady-state conditions. After that, the DOC response in transient conditions has been evaluated by means of vehicle systems simulations under different driving cycles representative of the homologation procedures currently in force around the world. The results show that the HC and CO levels at the DOC outlet are unacceptable considering the different emissions regulations. By this reason, a dedicated study to define the DOC size needed to accomplish the different emissions standards is carried out. The results suggest that, the DOC volume needed to fulfill the type approval regulation limits ranges from four to six times the original volume.
Rafael Lago Sari - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation on the efficiency of a Diesel Oxidation Catalyst in a medium duty multi cylinder rcci engine
Energy Conversion and Management, 2018Co-Authors: Jesus Benajes, Antonio Garcia, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion is one of the most promising low temperature combustion (LTC) techniques, as it is able to provide ultra-low NOx and soot emissions together with higher thermal efficiency than conventional Diesel combustion (CDC) in a wide range of operating conditions. However, the unburned hydrocarbon (UHC) and carbon monoxide (CO) emission levels are orders of magnitude higher than CDC, which can result in a major problem for implementing the RCCI concept in real engines. In this sense, the high levels of UHC and CO emissions together with the low exhaust temperatures during RCCI operation could compromise the Diesel Oxidation Catalyst (DOC) conversion efficiency. The objective of this work is to evaluate the efficiency of a conventional DOC in oxidizing the UHC and CO emissions from RCCI combustion. To do this, a medium-duty multi-cylinder Diesel engine equipped with its original after treatment system has been used. First, the DOC conversion efficiency is evaluated under some steady-state conditions. Later, the influence of the thermal inertia on the DOC response has been evaluated by means of transient tests. In this sense, different engine load-speed steps as well some simplified conditions from the worldwide harmonized vehicle cycle (WHVC) and the supplemental engine transient cycle (SET) are evaluated. In steady-state conditions, with DOC-inlet temperatures of 200–300 °C, the results show conversion efficiencies of 100% for CO and 85–95% for HC. At 10% and 25% load, the DOC-outlet UHC levels are unacceptable considering the EURO VI regulation, while at 50% load the tailpipe emissions fulfill the emissions standard. The results in transient conditions are more promising thanks to effect of the thermal inertia, showing 100% conversion efficiency for CO and greater than 90% for UHC during large periods of engine operation.
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sizing a conventional Diesel Oxidation Catalyst to be used for rcci combustion under real driving conditions
Applied Thermal Engineering, 2018Co-Authors: Antonio Garcia, Pedro Piqueras, Javier Monsalveserrano, Rafael Lago SariAbstract:Abstract Reactivity controlled compression ignition (RCCI) combustion has demonstrated to be able to avoid the NOx-soot trade-off appearing during conventional Diesel combustion (CDC), with similar or better thermal efficiency than CDC under a wide variety of engine platforms. However, a major challenge of this concept comes from the high hydrocarbon (HC) and carbon monoxide (CO) emission levels, which are orders of magnitude greater than CDC, and similar to those of port fuel injected (PFI) gasoline engines. The high HC and CO emissions levels combined with the low exhaust temperatures during RCCI operation could present a challenge for the current exhaust aftertreatment technologies. The objective of this work is to evaluate the potential of a conventional Diesel Oxidation Catalyst (DOC) for light-duty Diesel engines when operating under dual-fuel RCCI Diesel-gasoline combustion and to define its necessary size to accomplish with the current emissions standards. For this purpose, a 1-D model has been developed and calibrated through gas emissions measurements upstream and downstream the DOC under different engine steady-state conditions. After that, the DOC response in transient conditions has been evaluated by means of vehicle systems simulations under different driving cycles representative of the homologation procedures currently in force around the world. The results show that the HC and CO levels at the DOC outlet are unacceptable considering the different emissions regulations. By this reason, a dedicated study to define the DOC size needed to accomplish the different emissions standards is carried out. The results suggest that, the DOC volume needed to fulfill the type approval regulation limits ranges from four to six times the original volume.