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E Jiaqiang - One of the best experts on this subject based on the ideXlab platform.

  • effects analysis on Diesel soot continuous regeneration performance of a rotary microwave assisted regeneration Diesel Particulate Filter
    Fuel, 2020
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Zhiqing Zhang, Mengyuan Zhao, Qingguo Peng, Yuanwang Deng
    Abstract:

    Abstract In order to investigate effects of various factors on continuous regeneration performance of a rotary microwave-assisted regeneration Diesel Particulate Filter (MRDPF), a regeneration mathematical model and a field synergy model of the rotary MRDPF are developed, and turbulent kinetic energy distribution and pressure distribution of the rotary MRDPF based on three different turbulence models are analyzed. The results indicate that the RNG k-e model is more suitable for simulation of the rotary MRDPF and appropriate increment of Filter unit number, oxygen content and exhaust gas temperature can result in the regeneration performance improvement of the rotary MRDPF. Inlet flow velocity of exhaust gas can change synergy degree between the velocity field and the temperature field and high synergy area is mainly concentrated in the upper and central parts of the Filter unit. Moreover, field synergy degree and regeneration efficiency of the Filter unit are both better when the flow velocity reaches 0.3 m/s during regeneration phase, where regeneration optimized area ratio and maximum regeneration efficiency are 0.51 and 91%, respectively. This work provides great reference values for optimizing the continuous regeneration performance of the rotary MRDPF.

  • performance enhancement of microwave assisted regeneration in a wall flow Diesel Particulate Filter based on field synergy theory
    Energy, 2019
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Longfu Xie, Jingwei Chen, Zhiqing Zhang
    Abstract:

    Abstract In this work, a three-dimensional mathematical model is established to investigate the flow and the heat transfer of the combustion process and the distribution characteristics of temperature field in the wall-flow in porous media of the wall-flow Diesel Particulate Filter (DPF) based on the Field Synergy Theory (FST). The results indicate that there is the smallest temperature uniformity coefficient in wall-flow DPF when the inlet velocity is 36 m/s. And at first, the microwave assisted regeneration temperature increases and then decreases as the exhaust temperature rises which is affected by the exhaust temperature. The data indicate that the inlet pressure can change the angle between velocity vector and temperature gradient, which leads to the change of synergy degree of the velocity field and temperature field. When the inlet pressure is 0.08 MPa, there is an optimal synergy degree with the maximum average temperature.

  • investigations on the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process and its field synergy analysis
    Applied Thermal Engineering, 2017
    Co-Authors: Yuanwang Deng, Bin Zhang, Xiaohuan Zhao, Jinhui Cui, E Jiaqiang, Zhiqing Zhang, Dandan Han
    Abstract:

    Abstract In order to enhance the reasonableness of temperature distribution of the Diesel Particulate Filter (DPF), a thermal regeneration model of the DPF is developed to investigate the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process, and the internal temperature and temperature gradient in channels are simulated. Moreover, field synergy theory is used to optimize temperature distribution of the DPF in the thermal regeneration process due to synergy degree between velocity vector and temperature gradient. The results reveal that increase of the exhaust mass flow in the thermal regeneration process will lead to the increase of temperature value from the Filter section to the contraction section of along the axial direction, the peak of the radial temperature gradient will appear in the front of the Filter section and contraction section, and the maximum value will first decrease and then increase, but the peak of axial temperature gradient will appear in the front of the Filter section. When the exhaust mass flow is about 20–30 g/s, there is an optimum flow area for the peak of radial temperature gradient, and the peak of axial temperature gradient will decrease gradually. Moreover, particle load which is less than 5 g/L can avoid the melt failure and the thermal stress damage.

  • effect analysis on pressure drop of the continuous regeneration Diesel Particulate Filter based on no2 assisted regeneration
    Applied Thermal Engineering, 2016
    Co-Authors: E Jiaqiang, Wei Zuo, Zhiqing Zhang, Qingguo Peng, Junxu Gao, Pham Minh Hieu
    Abstract:

    Abstract In order to enhance the dynamic performance, fuel economy and reduce Particulate emissions for a Diesel engine, the key is to reduce the pressure drop of continuous regeneration-Diesel Particulate Filter (CR-DPF) based on NO2-assisted regeneration. In this work, firstly, a mathematic model based on NO2-assisted regeneration is developed. Then, the effects of the exhaust gas parameters and structural parameters of the CR-DPF on pressure drop in the NO2-assisted regeneration process are investigated and verified by experiments. Results show that the pressure drop is decreased under some conditions such as the moderate increase of the low exhaust flow rate, the reduction of the exhaust temperature, the reduction of the NO2 concentration in the exhaust gas and the increase of the channel wall thickness, while the pressure drop is increased under other conditions such as the mass ratio m(NO2)/m(soot) between the NO2 and the soot being less than its threshold in exhaust gas, the increase of the Filter length of the CR-DPF and the increase of the channel density when initial amount of the soot in Filter is less than its threshold. Moreover, the O2 concentration in exhaust gas has no effect on the pressure drop. Finally, the proper ranges of some key parameters for reducing pressure drop of the CR-DPF have been provided.

  • effect analysis on regeneration speed of continuous regeneration Diesel Particulate Filter based on no2 assisted regeneration
    Atmospheric Pollution Research, 2016
    Co-Authors: E Jiaqiang, Qingsong Zuo, Longfu Xie, Guiju Zhang
    Abstract:

    Abstract In order to improve the regeneration speed of Continuous Regeneration-Diesel Particulate Filter (CR-DPF) based on NO 2 -assisted regeneration, a mathematic model of the NO 2 -assisted regeneration is developed and verified by experiments and numerical simulation. Furthermore, the influences on regeneration speed from exhaust airflow and Filter structure are studied in NO 2 -assisted regeneration process of CR-DPF. The results show that: the regeneration speed will be increased due to the increase of the volume of the exhaust gas, the temperature of the exhaust gas, the concentration of the NO 2 and the concentration of the O 2 in exhaust gas, but the regeneration speed will be decreased under other conditions such as m (NO 2 )/ m (PM) being less than its threshold in exhaust gas, the increase of the Filter length in CR-DPF or the increase of the channel density when initial amount of the carbon particles in Filter being less than its threshold, moreover, thickness of channel wall has no effect on regeneration speed. And the suitable range of values for some key parameters being useful for enhancing regeneration speed and reducing pressure drop of CR-DPF has been provided.

Zhiqing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • effects analysis on Diesel soot continuous regeneration performance of a rotary microwave assisted regeneration Diesel Particulate Filter
    Fuel, 2020
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Zhiqing Zhang, Mengyuan Zhao, Qingguo Peng, Yuanwang Deng
    Abstract:

    Abstract In order to investigate effects of various factors on continuous regeneration performance of a rotary microwave-assisted regeneration Diesel Particulate Filter (MRDPF), a regeneration mathematical model and a field synergy model of the rotary MRDPF are developed, and turbulent kinetic energy distribution and pressure distribution of the rotary MRDPF based on three different turbulence models are analyzed. The results indicate that the RNG k-e model is more suitable for simulation of the rotary MRDPF and appropriate increment of Filter unit number, oxygen content and exhaust gas temperature can result in the regeneration performance improvement of the rotary MRDPF. Inlet flow velocity of exhaust gas can change synergy degree between the velocity field and the temperature field and high synergy area is mainly concentrated in the upper and central parts of the Filter unit. Moreover, field synergy degree and regeneration efficiency of the Filter unit are both better when the flow velocity reaches 0.3 m/s during regeneration phase, where regeneration optimized area ratio and maximum regeneration efficiency are 0.51 and 91%, respectively. This work provides great reference values for optimizing the continuous regeneration performance of the rotary MRDPF.

  • performance enhancement of microwave assisted regeneration in a wall flow Diesel Particulate Filter based on field synergy theory
    Energy, 2019
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Longfu Xie, Jingwei Chen, Zhiqing Zhang
    Abstract:

    Abstract In this work, a three-dimensional mathematical model is established to investigate the flow and the heat transfer of the combustion process and the distribution characteristics of temperature field in the wall-flow in porous media of the wall-flow Diesel Particulate Filter (DPF) based on the Field Synergy Theory (FST). The results indicate that there is the smallest temperature uniformity coefficient in wall-flow DPF when the inlet velocity is 36 m/s. And at first, the microwave assisted regeneration temperature increases and then decreases as the exhaust temperature rises which is affected by the exhaust temperature. The data indicate that the inlet pressure can change the angle between velocity vector and temperature gradient, which leads to the change of synergy degree of the velocity field and temperature field. When the inlet pressure is 0.08 MPa, there is an optimal synergy degree with the maximum average temperature.

  • investigations on the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process and its field synergy analysis
    Applied Thermal Engineering, 2017
    Co-Authors: Yuanwang Deng, Bin Zhang, Xiaohuan Zhao, Jinhui Cui, E Jiaqiang, Zhiqing Zhang, Dandan Han
    Abstract:

    Abstract In order to enhance the reasonableness of temperature distribution of the Diesel Particulate Filter (DPF), a thermal regeneration model of the DPF is developed to investigate the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process, and the internal temperature and temperature gradient in channels are simulated. Moreover, field synergy theory is used to optimize temperature distribution of the DPF in the thermal regeneration process due to synergy degree between velocity vector and temperature gradient. The results reveal that increase of the exhaust mass flow in the thermal regeneration process will lead to the increase of temperature value from the Filter section to the contraction section of along the axial direction, the peak of the radial temperature gradient will appear in the front of the Filter section and contraction section, and the maximum value will first decrease and then increase, but the peak of axial temperature gradient will appear in the front of the Filter section. When the exhaust mass flow is about 20–30 g/s, there is an optimum flow area for the peak of radial temperature gradient, and the peak of axial temperature gradient will decrease gradually. Moreover, particle load which is less than 5 g/L can avoid the melt failure and the thermal stress damage.

  • effect analysis on pressure drop of the continuous regeneration Diesel Particulate Filter based on no2 assisted regeneration
    Applied Thermal Engineering, 2016
    Co-Authors: E Jiaqiang, Wei Zuo, Zhiqing Zhang, Qingguo Peng, Junxu Gao, Pham Minh Hieu
    Abstract:

    Abstract In order to enhance the dynamic performance, fuel economy and reduce Particulate emissions for a Diesel engine, the key is to reduce the pressure drop of continuous regeneration-Diesel Particulate Filter (CR-DPF) based on NO2-assisted regeneration. In this work, firstly, a mathematic model based on NO2-assisted regeneration is developed. Then, the effects of the exhaust gas parameters and structural parameters of the CR-DPF on pressure drop in the NO2-assisted regeneration process are investigated and verified by experiments. Results show that the pressure drop is decreased under some conditions such as the moderate increase of the low exhaust flow rate, the reduction of the exhaust temperature, the reduction of the NO2 concentration in the exhaust gas and the increase of the channel wall thickness, while the pressure drop is increased under other conditions such as the mass ratio m(NO2)/m(soot) between the NO2 and the soot being less than its threshold in exhaust gas, the increase of the Filter length of the CR-DPF and the increase of the channel density when initial amount of the soot in Filter is less than its threshold. Moreover, the O2 concentration in exhaust gas has no effect on the pressure drop. Finally, the proper ranges of some key parameters for reducing pressure drop of the CR-DPF have been provided.

Bin Zhang - One of the best experts on this subject based on the ideXlab platform.

  • effects analysis on Diesel soot continuous regeneration performance of a rotary microwave assisted regeneration Diesel Particulate Filter
    Fuel, 2020
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Zhiqing Zhang, Mengyuan Zhao, Qingguo Peng, Yuanwang Deng
    Abstract:

    Abstract In order to investigate effects of various factors on continuous regeneration performance of a rotary microwave-assisted regeneration Diesel Particulate Filter (MRDPF), a regeneration mathematical model and a field synergy model of the rotary MRDPF are developed, and turbulent kinetic energy distribution and pressure distribution of the rotary MRDPF based on three different turbulence models are analyzed. The results indicate that the RNG k-e model is more suitable for simulation of the rotary MRDPF and appropriate increment of Filter unit number, oxygen content and exhaust gas temperature can result in the regeneration performance improvement of the rotary MRDPF. Inlet flow velocity of exhaust gas can change synergy degree between the velocity field and the temperature field and high synergy area is mainly concentrated in the upper and central parts of the Filter unit. Moreover, field synergy degree and regeneration efficiency of the Filter unit are both better when the flow velocity reaches 0.3 m/s during regeneration phase, where regeneration optimized area ratio and maximum regeneration efficiency are 0.51 and 91%, respectively. This work provides great reference values for optimizing the continuous regeneration performance of the rotary MRDPF.

  • performance enhancement of microwave assisted regeneration in a wall flow Diesel Particulate Filter based on field synergy theory
    Energy, 2019
    Co-Authors: E Jiaqiang, Bin Zhang, Xiaohuan Zhao, Qingsong Zuo, Dandan Han, Longfu Xie, Jingwei Chen, Zhiqing Zhang
    Abstract:

    Abstract In this work, a three-dimensional mathematical model is established to investigate the flow and the heat transfer of the combustion process and the distribution characteristics of temperature field in the wall-flow in porous media of the wall-flow Diesel Particulate Filter (DPF) based on the Field Synergy Theory (FST). The results indicate that there is the smallest temperature uniformity coefficient in wall-flow DPF when the inlet velocity is 36 m/s. And at first, the microwave assisted regeneration temperature increases and then decreases as the exhaust temperature rises which is affected by the exhaust temperature. The data indicate that the inlet pressure can change the angle between velocity vector and temperature gradient, which leads to the change of synergy degree of the velocity field and temperature field. When the inlet pressure is 0.08 MPa, there is an optimal synergy degree with the maximum average temperature.

  • Effects analysis on optimal microwave energy consumption in the heating process of composite regeneration for the Diesel Particulate Filter
    Applied Energy, 2019
    Co-Authors: Jiaqiang E, Bin Zhang, Xiaohuan Zhao, Guanlin Liu, Qingsong Zuo, Kexiang Wei, Dandan Han, Jinke Gong
    Abstract:

    Abstract It is difficult for Diesel vehicle battery to meet microwave energy consumption during regeneration of Diesel Particulate Filter, which restricts the application of microwave regeneration technology. In order to minimize the microwave energy consumption during the composite regeneration heating phase of the Diesel Particulate Filter, an optimal microwave energy consumption model is established in this study based on the Functional Analysis Principles. The solution of this optimal model is simulated by the Adaptive Variable Scale Chaos Immune Algorithm. The optimized results are got and verified by experiments under different experimental cases. The simulation results show that an optimal microwave power and regeneration heating time can be effectively obtained during the composite regeneration heating phase. The experimental results indicate that optimization microwave energy consumption under 4 experimental cases decrease by 5.65%, 5.70%, 10.64% and 14.64% compared with that unoptimized data of 93.8 kJ, 75.6 kJ, 65.8 kJ and 56.7 kJ, respectively. The ratio of efficiency to energy of the optimized cases is higher than that of the cases without optimization. The effects of optimal microwave energy consumption in the heating process of composite regeneration are investigated. Moreover, the microwave assisted composite regeneration can save about 24% and 48% energy by contrast of the microwave regeneration and fuel post-injection regeneration. The proposed microwave energy consumption optimization method can save microwave energy and meet the regeneration performance requirement of the Diesel Particulate Filter.

  • investigations on the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process and its field synergy analysis
    Applied Thermal Engineering, 2017
    Co-Authors: Yuanwang Deng, Bin Zhang, Xiaohuan Zhao, Jinhui Cui, E Jiaqiang, Zhiqing Zhang, Dandan Han
    Abstract:

    Abstract In order to enhance the reasonableness of temperature distribution of the Diesel Particulate Filter (DPF), a thermal regeneration model of the DPF is developed to investigate the temperature distribution of the Diesel Particulate Filter in the thermal regeneration process, and the internal temperature and temperature gradient in channels are simulated. Moreover, field synergy theory is used to optimize temperature distribution of the DPF in the thermal regeneration process due to synergy degree between velocity vector and temperature gradient. The results reveal that increase of the exhaust mass flow in the thermal regeneration process will lead to the increase of temperature value from the Filter section to the contraction section of along the axial direction, the peak of the radial temperature gradient will appear in the front of the Filter section and contraction section, and the maximum value will first decrease and then increase, but the peak of axial temperature gradient will appear in the front of the Filter section. When the exhaust mass flow is about 20–30 g/s, there is an optimum flow area for the peak of radial temperature gradient, and the peak of axial temperature gradient will decrease gradually. Moreover, particle load which is less than 5 g/L can avoid the melt failure and the thermal stress damage.

  • Multidisciplinary design optimization of the Diesel Particulate Filter in the composite regeneration process
    Applied Energy, 2016
    Co-Authors: Bin Zhang, Wenhua Yuan, Yu Li, Jinke Gong, Wei Zuo, Jun Fu
    Abstract:

    In our previous works, the Diesel Particulate Filter (DPF) using a new composite regeneration mode by coupling microwave and ceria-manganese base catalysts is verified as an effective way to reduce the Particulate matter emission of the Diesel engine. In order to improve the overall performance of this DPF, its multidisciplinary design optimization (MDO) model is established based on objective functions such as pressure drop, regeneration performance, microwave energy consumption, and thermal shock resistance. Then, the DPF is optimized by using MDO method based on adaptive mutative scale chaos optimization algorithm. The optimization results show that with the help of MDO, DPF's pressure drop is decreased by 14.5%, regeneration efficiency is increased by 17.3%, microwave energy consumption is decreased by 17.6%, and thermal deformation is decreased by 25.3%. The optimization results are also verified by experiments, and the experimental results indicate that the optimized DPF has larger filtration efficiency, better emission performance and regeneration performance, smaller pressure drop, lower wall temperature and temperature gradient, and lower microwave energy consumption.

Tao Huai - One of the best experts on this subject based on the ideXlab platform.

  • real time Particulate emissions rates from active and passive heavy duty Diesel Particulate Filter regeneration
    Science of The Total Environment, 2019
    Co-Authors: Jeremy D Smith, David Quiros, Mark Burnitzki, Wayne Sobieralski, Robert Ianni, Don Chernich, Chris Ruehl, Shaohua Hu, John Collins, Tao Huai
    Abstract:

    Periodic regeneration is required to clean the Diesel Particulate Filter (DPF) of heavy-duty Diesel vehicle. In this study we analyze real-time Particulate matter (PM) mass, particle number, and black carbon emissions during steady state driving active and passive Diesel Particulate Filter (DPF) regenerations on a heavy-duty chassis dynamometer. Regeneration PM emissions were dominated by particles with count median diameter<100nm, with the majority <50nm. Results indicate that vehicle activity during DPF loading significantly affects regeneration Particulate emissions. Average PM emission rates (gPM/h) from the 2010 MY vehicle were higher than the 2007 MY vehicle during all regeneration conditions in this study. Sequential forced-active regenerations resulted in reduced Particulate mass emissions, but not in reduced particle number emissions, suggesting incomplete stored PM removal or effects of after-treatment fuel injection. Black carbon emission factors (EFBC) were 3.4 and 21 times larger during driving-active regeneration than during a 50 mph steady state cruise with a recently regenerated DPF for the 2007 and 2010 MY vehicle, respectively. Real-time PM emissions rates were lower during passive regeneration of the 2010 MY DPF, suggesting more modern passive regeneration technologies reduce total on-road Particulate and ultrafine Particulate emissions.

  • Measuring Particulate matter emissions during parked active Diesel Particulate Filter regeneration of heavy-duty Diesel trucks
    Journal of Aerosol Science, 2014
    Co-Authors: David C. Quiros, John F. Collins, Harry A. Dwyer, Seungju Yoon, Yifang Zhu, Tao Huai
    Abstract:

    Heavy-duty Diesel trucks (HDDTs, >33,000 pounds gross vehicle weight rating) are commonly equipped with Diesel Particulate Filters (DPFs) to meet the California model year (MY) 2007 PM emissions standard. Particulate matter (PM) emissions were measured from nine parked active DPF regenerations of two HDDTs, a 2007 and 2010 MY, using a novel ambient-dilution wind tunnel. This work specifically evaluated PM mass emissions during regeneration by measurements from the following instruments: TSI DustTrak DRX 8533, TSI Engine Exhaust Particle Sizer 3090 (EEPS) and TSI Scanning Mobility Particle Sizer 3936L88 (SMPS), Filters by gravimetric analysis, and for one test a Dekati Mass Monitor 230-A (DMM). Active regeneration by fuel injection upstream of the DPF began with the Soot Combustion Regime, where PM emissions had a count median diameter (CMD) of >30. nm and some faint gray smoke was observed flowing from the tunnel. During brief moments of the Soot Combustion Regime, the DustTrak DRX reported more than half of the mass was >1. μm. As active regeneration continued, aftertreatment inlet temperature increased to >500. °C, beginning the Fuel Combustion Regime, defined conversely where the CMD of the emissions was

  • Emissions from a Diesel car during regeneration of an active Diesel Particulate Filter
    Journal of Aerosol Science, 2010
    Co-Authors: Harry Dwyer, Alberto Ayala, John Herner, Tao Huai, Sherry Zhang, John Collins, Wilson Chau
    Abstract:

    The California Air Resources Board (CARB) and the Joint Research Center of the European Commission (JRC) have collaborated on emissions testing of a light duty Diesel vehicle, which is Euro 4 compliant and comes equipped with a Diesel Particulate Filter (DPF). The California testing included an investigation of the regeneration of the DPF over cruise conditions and NEDC test cycles. DPF regeneration is caused by the buildup of soot in the Filter, and for the present test vehicle the regeneration process is assisted by a fuel borne catalyst. Regulated exhaust emissions increased substantially during the regeneration events; however, PM emissions levels were below California LEVII emissions standards. There was a very large increase of volatile particles between 5 and 10. nm, and these volatile particles were generated during all of the observed regeneration events. It appears that the particle number instruments that use the PMP methodology do not capture the PM mass increase during DPF regeneration; however, for one regeneration event there was an apparent large increase in solid particles below the PMP size limit. The PM mass increase associated with regeneration appears to be due to semi-volatile particles collected on Filters. During the testing, the regeneration events exhibited considerable variations in the time for regeneration as well as the amount of PM emissions. From this investigation, several questions have been posed concerning the emission of very small (

Pham Minh Hieu - One of the best experts on this subject based on the ideXlab platform.

  • effect analysis on pressure drop of the continuous regeneration Diesel Particulate Filter based on no2 assisted regeneration
    Applied Thermal Engineering, 2016
    Co-Authors: E Jiaqiang, Wei Zuo, Zhiqing Zhang, Qingguo Peng, Junxu Gao, Pham Minh Hieu
    Abstract:

    Abstract In order to enhance the dynamic performance, fuel economy and reduce Particulate emissions for a Diesel engine, the key is to reduce the pressure drop of continuous regeneration-Diesel Particulate Filter (CR-DPF) based on NO2-assisted regeneration. In this work, firstly, a mathematic model based on NO2-assisted regeneration is developed. Then, the effects of the exhaust gas parameters and structural parameters of the CR-DPF on pressure drop in the NO2-assisted regeneration process are investigated and verified by experiments. Results show that the pressure drop is decreased under some conditions such as the moderate increase of the low exhaust flow rate, the reduction of the exhaust temperature, the reduction of the NO2 concentration in the exhaust gas and the increase of the channel wall thickness, while the pressure drop is increased under other conditions such as the mass ratio m(NO2)/m(soot) between the NO2 and the soot being less than its threshold in exhaust gas, the increase of the Filter length of the CR-DPF and the increase of the channel density when initial amount of the soot in Filter is less than its threshold. Moreover, the O2 concentration in exhaust gas has no effect on the pressure drop. Finally, the proper ranges of some key parameters for reducing pressure drop of the CR-DPF have been provided.