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Investigation on the urea deposit formation and thermal decomposition characteristics in the SCR aftertreatment system of a diesel engine

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Journal of Environmental Sciences 2021年第5期33卷 157-171页

作者： Menghan Li Yao Zhang Jiancheng Yang Xiaori Liu Zhenguo Li Qiang Zhang Tianjin Key Laboratory of Clean Energy and Pollution Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300401China School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China State Key Laboratory of Engines Tianjin UniversityTianjin 300072China School of Energy and Power Engineering Shandong UniversityJinanShandong 250061China

Selective catalytic reduction is the most efficient and reliable equipment for NOx control in current diesel engines. However, the issue of urea crystallization becomes increasingly serious with the implement of the new emissions standards. In this paper, urea deposit samples collected from engine test bed and tube furnace were characterized by thermogravimetric analysis and Fourier transform-infrared analysis to aid the comprehension of urea deposit formation. Moreover, thermogravimetric tests were conducted to disclose the effects of catalyst on the thermal decomposition processes of urea deposit. The results indicated that less temperature resistant species are formed in the engine test bed than in the tube furnace at conditions with the same temperatures. The main compositions in the World Harmonized Transient Cycle(WHTC) urea deposits are urea, cyanuric acid(CYA) and ammelide, implying that accelerating the decomposition of these species could prevent the accumulation of urea deposit. CuWTi, Cu β and CuZSM catalysts could lead to increased yield of CYA during pure urea thermolysis. Cu β, CuWTi and VWTi catalysts tend to promote the thermolysis of CYA while VWTi has the most significant catalytic effects on the thermal decomposition of ammelide and ammeline.

关键词： Urea deposit Decomposition characteristics Selective catalytic reduction Catalyst Thermolysis

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Selective catalytic reduction of NO_(x) with NH_(3) assisted by non-thermal plasma over CeMnZrO_(x)@TiO_(2) core–shell catalyst

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Plasma Science and technology 2022年第5期24卷 48-56页

作者： Tao ZHU Xing ZHANG Zhenguo LI Xiaoning REN Baodong WANG Xuyang CHONG Hongli MA Institute of Atmospheric Environmental Management and Pollution Control China University of Mining&Technology(Beijing)Beijing 100083People’s Republic of China State Key Laboratory of Petroleum Pollution Control CNPC Research Institute of Safety and Environmental TechnologyBeijing 102206People’s Republic of China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.LtdTianjin 300300People’s Republic of China National Institute of Clean-and-Low-Carbon Energy Beijing 102211People’s Republic of China

The presented work reports the selective catalytic reduction(SCR)of NO_(x) assisted by dielectric barrier discharge plasma via simulating marine diesel engine exhaust,and the experimental results demonstrate that the low-temperature activity of NH_(3)-SCR assisted by non-thermal plasma is enhanced significantly,particularly in the presence of a C_(3)H_(6) ***,CeMnZrO_(x)@TiO_(2) exhibits strong tolerance to SO_(2) poisoning and superior catalytic *** is worthwhile to explore a new approach to remove NO_(x) from marine diesel engine exhaust,which is of vital significance for both academic research and practical applications.

关键词： non-thermal plasma selective catalytic reduction marine diesel engine exhaust CeMnZrO_(x)@TiO_(2) NO_(x)conversion

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Interval Type-2 Fuzzy Neural Network Based Cascade Predictive control of Superheated Steam Temperature 4

Interval Type-2 Fuzzy Neural Network Based Cascade Predictiv...

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2024 4th International Conference on Fluid and Chemical engineering, ICFCE 2024

作者： Wang, Maoxuan Wu, Hanming Shao, Yuankai Meng, Lingwei Li, Zhenguo Wang, Tianyou School of Mechanical Engineering Tianjin University Tianjin300300 China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology & Research Center Co. Ltd. Tianjin300300 China

The superheated steam temperature (SST) suffers from complex dynamic characteristics such as nonlinearity and large time delay. To deal with the negative effects, this paper proposes a cascade predictive control strategy (CPC-PI) based on interval type-2 fuzzy neural network (IT2FNN) to improve the performance of SST. First, this paper proposes the IT2FNN model for modeling the SST model. And then on the basis the local linearized IT2FNN model, the CPC-PI strategy is designed. In the following, fuzzy self-regulation of the weight factor in the CPCPI is carried out to further improve the dynamic response speed and stability of SST. Finally, the comparative simulations verify that the IT2FNN-based CPC-PI control strategy with self-regulated weight factor is superior to the PI-PI control strategy and the IT2FNN-based CPC-PI control strategy with fixed weight factor. © Published under licence by IOP Publishing Ltd.

关键词： Predictive control systems

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Availability model based on task and risk model based on safety for condition based maintenance 50

Availability model based on task and risk model based on saf...

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50th International Conference on Vibroengineering

作者： Li, Menghan Liu, Xin Yang, Kun Li, Zhenguo National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology and Research Center Co. Ltd. Tianjin China Institute of Medical Support Technology Academy of Systems Engineering Academy of Military Science of PLA Tianjin China

The most important thing for condition based maintenance (CBM) is the maintenance decision-making, while the existing research mainly considers system maintenance decision-making from the economic point of view, but the actual situation is that the availability and safety of the system are more important in most cases. In this paper, the maintenance decision-making model of the system is established by giving priority to the availability and safety of the system, which is more in line with the engineering practice and lays a foundation for the application of condition based maintenance. Copyright © 2021 Menghan Li, et al.

关键词： Condition based maintenance

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NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH_(4) as reductant

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Plasma Science and technology 2021年第2期23卷 76-84页

作者： Tao ZHU Xing ZHANG Nengjing YI Haibing LIU Zhenguo LI Institute of Atmospheric Environmental Management and Pollution Control China University of Mining&Technology(Beijing)Beijing 100083People's Republic of China Solid Waste and Chemicals Management Technology Center China Ministry of Ecology and EnvironmentBeijing 100029People's Republic of China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300People's Republic of China State Key Laboratory of Organic Geochemistry Chinese Academy of SciencesGuangzhou 510640People's Republic of China

NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx reduction has been confirmed in the past few *** work reports the NSR of nitric oxide(NO)by combining non-thermal plasma(NTP)and Co/Pt/Ba/γ-Al2O3(Co/PBA)catalyst using methane as a *** experimental results reveal that the NOx conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150°C–350°C,and NOx conversion of the 8%Co/PBA catalyst reaches 96.8%at 350°***(O_(2))has a significant effect on the removal of NOx,and the NOx conversion increases firstly and then decreases when the O_(2)concentration ranges from 2%to 10%.Water vapor reduces the NOx storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA *** is a negative correlation between sulfur dioxide(SO_(2))and NOx conversion in the NTP system,and the 8%Co/PBA catalyst exhibits higher NOx conversion compared to other catalysts,which shows that Co has a certain SO_(2)resistance.

关键词： non-thermal plasma NOx storage and reduction Co/Pt/Ba/γ-Al2O3 catalyst NOx conversion influence parameter

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High Magnetic Property and Toxicity of Particulate Matter Generated during Welding and Cutting Processes

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Environment & Health 2024年第6期2卷 381-389页

作者： Wei Cui Zizhen Ma Yuanzheng Chen Shuya Li Di Wu Xiu Chen Yuankai Shao Yuzhe Liu Qing Li Jianmin Chen Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China Shanghai Institute of Eco-Chongming(SIEC) Shanghai 200062China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.LtdTianjin 300300China

Magnetic particulate matter(PM)has raised increasing concern due to its abundant presence in ambient air and negative health ***,there is still a lack of comprehensive understanding of their emission sources and *** here report the observation of high magnetic property and toxicity of PM generated during typical welding and cutting ***,formed during high-temperature operation with less oxygen pressure,was revealed to be the major magnetic *** averaged saturation magnetization and magnetic susceptibility values of fine PM(PM_(2.5))from welding processes are 1.4−4.2 times greater than those of PM emitted from other unintended emission sources,including iron and steel plants and brake wear,while they are 2.0−5.7 times greater for the cutting ***,PM_(2.5)from welding and cutting processes are nearly 3.5−4.5 times more neurovirulent and 2.1−7.0 times more likely to induce oxidative stress than those from other magnetic sources in the nerve cells ***,all of these magnetic PM_(2.5)exhibit greater negative health effects than typical atmospheric PM_(2.5)collected in Shanghai urban *** new findings suggest that appropriate occupational protection measures should be implemented for the welding and cutting process to reduce adverse health impacts.

关键词： pollutant emission magnetic property particulate matters magnetite welding and cutting

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Optimization of Hybrid Crystal with SAPO-5/34 on Hydrothermal Stability for deNOx Reaction by NH3

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Chemical Research in Chinese Universities 2020年第6期36卷 1249-1254页

作者： LIN Qingjin LIN Chenlu LIU Jingying LIU Shuang XU Haidi CHEN Yaoqiang DAN Yi State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu 610064P.R.China Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center College of ChemistrySichuan UniversityChengdu 610064P.R.China Institute of New Energy and Low-carbon Technology Sichuan UniversityChengdu 610064P.R.China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research CenterTianjin 300300P.R.China Sichuan University FGD(Flue Gas Desulfurization)State Engineering Research Center Chengdu 610064P.R.China

In order to deal with the challenge of the hydrothermal deactivation of selective catalytic reduction of NO by NH3(NH3-SCR)catalyst and extend its lifetime,a novel Cu/SAPO-5/34 catalyst was prepared,and it almostmaintains its deNOx performance with a high conversion rate of 90%NO,between 175℃and 400℃after under-going the rigorous treatment at 800℃for 12 ***,Cu/SAPO-5/34 is more recalcitrant to the high-temperature hydrothermal deactivation than Cu/***,the formation of N20 is always below 3×10^-6(3 ppm)during the whole reaction *** an advanced catalytic *** effect of high-temperature hvdro-thermal treatment on the morphology,structure and texture property,the acid sites,as well as the active copper spe cies were *** characterizations manifest that the optimized high-temperature hydrothermal stability is associated closely with the good structural stability over Cu/SAPO-5/*** facilitates to preserve reaction sites,and then showing the better hydrothermal stability than Cu/SAPO-34.

关键词： Hybrid crystal High-temperature hydrothermal stability Selective catalytic reduction of NO,by NH(NH3-SCR)

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Effect of EUP Injection Parameters on the Combustion Characteristics of Diesel Engine

Effect of EUP Injection Parameters on the Combustion Charact...

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作者： Dong TANG Xiao-feng MIAO Yi-wen ZHOU Jian-fei WEI Xiang-lin ZHONG School of Automobile and Traffic Engineering Jiangsu University National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology & Research Center Co. Ltd.

With the increasingly stringent requirements for energy conservation and emission reduction of diesel engine, electronic control of diesel fuel injection system is necessary. EUP(electronic unit pump) can precisely control the fuel injection process which can reduce the exhaust emission and fuel consumption effectively. In this paper a EUP diesel engine is used as the research object. Through the combination of simulation and experiment, the effect of injector diameter and injection timing on the combustion of the engine is studied. The results show that the above parameters have an important effect on the gas mixture formation and combustion process of the diesel engine in the cylinder. By selecting the appropriate parameters, the optimized diesel engine can meet the non-road national stage III emission regulation.

关键词： Diesel Engine Injection Parameter Combustion emission Numerical Simulation

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Weakening CO poisoning over size-and support-dependent Pt_(n)/X-graphene catalyst(X=C,B,N,n=1-6,13)

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Rare Metals 2023年第4期42卷 1138-1145页

作者： An-Qi Dong Hui Li Han-Ming Wu Kai-Xiang Li Yuan-Kai Shao Zhen-Guo Li Shu-Hui Sun Wei-Chao Wang Wei-Bo Hu Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology Nankai UniversityTianjin300071China College of Information Science and Engineering Jiaxing UniversityJiaxing314001China Zhejiang Engineering Research Center of Intelligent Human Health Situation Awareness Jiaxing UniversityJiaxing314001China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.LtdTianjin300300China Institute National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux et TélécommunicationsVarennesQuébecJ3X 1P7Canada College of Electronic Information and Optical Engineering Nankai UniversityTianjin300071China

CO poisoning is one of the obstacles for platinum catalysts toward the electro-catalysis process for proton exchange membrane fuel cell(PEMFC)or direct methanol fuel cell(DMFC).Herein,we aim to weaken the CO poisoning... 详细信息

关键词： sizes methanol size

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Lignosulfonate Boost the Nitrogen-Dopped Carbon Supercapacitor Pseudocapacitance Behavior

SSRN

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SSRN 2022年

作者： Zhou, Bingjie Shao, Yuankai Li, Zhenguo Ren, Bin Ren, Xiaoning Li, Kaixiang Liu, Qingling National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology & Research Center Co. Ltd. Tianjin300300 China Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and Technology Tianjin University Tianjin300350 China State Key Laboratory of Engines Tianjin University Tianjin300350 China Institute of Energy Resources Hebei Academy of Science Hebei Province Shijiazhuang050081 China

To meet the growing demand for energy, more effort has been paid to the development of renewable biomass energy storage devices. Lignin-based supercapacitors, due to multiple pseudocapacitive functional groups in the natural lignin biomolecules and their derivatives, have received more attention. The lignosulfonate/carbon composite (LS/NC), synthesized by sodium lignosulfonate (LS) and nitrogen-dopped carbon (NC). NC provides ion diffusion channel with low internal resistance and high double layer reaction area, facilitating diffusion and transmission of electrolyte ions. The nitrogen and sulfur heteroatoms not only increase the hydrophilicity and wettability of materials, but also provides more polar surface and reversible pseudo-active points. The synergistic effect of heteroatomic doping, specific surface area and quinone significantly boost the electrochemical performance of LS/NC. The capacitance of LS/NC composite was achieved 571 F g-1 at 1 A g−1 in an acidic system, as twice as the capacitance (279 F g-1) of NC. © 2022, The Authors. All rights reserved.

关键词： Nitrogen

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