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Effect of HCl and o-DCBz on NH3-SCR of NO over MnOx/TiO2 and MnOx-CeO2/TiO2 catalysts

APPLIED CATALYSIS A-GENERAL 2020年 605卷 117801-117801页

作者： Wang, Qiulin Lin, Feng Zhou, Jianjian Zhang, Jianchao Jin, Jing Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

A novel selective catalytic reduction (SCR) catalyst with strong chlorine resistance ability is urgently needed to extend the catalyst life, when SCR technique is applied in plants with high chlorine content (e.g. municipal solid waste and medical waste incinerators). This study investigates the influences of typical chlorine-containing inorganic/organic compounds (i.e. hydrogen chloride (HCl) and o-dichlorobenzene (o-DCBz)) on NH3-SCR of NO over MnOx/TiO2 and MnOx-CeO2/TiO2 catalysts at low temperatures (100 - 250 degrees C). The results indicate the presence of HCl severely inhibits the NH3-SCR reaction. On one hand, the reaction between NH3 and HCl causes the deposition of NH4Cl on catalyst surface and reduces the amount of NH3;on the other hand, HCl consumes the surface acid sites which is essential to the adsorption and activation of NH3;moreover, chlorine (Cl) atom prefers to anchor on the uncoordinated metal sites that restrains the regeneration of surface reactive oxygen species and interrupts the redox cycle of catalysts. Ce addition enhances the chlorine resistance property of MnOx-CeO2/TiO2 catalyst by interacting with HCl preferentially. The negative effect of o-DCB on NH3-SCR reaction is more serious than that of HCl below 200 degrees C. That's because the competitive effect between o-DCB catalytic oxidation and deNO(x) via NH3-SCR reaction as well as the accumulation of o-DCB incomplete oxidation byproducts on catalyst surface further aggravates the catalyst deactivation induced by Cl atom.

关键词： NH3-SCR MnOx-based catalyst Chlorine poisoning Ce addition Effect of o-DCBz

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Competition between reduction reaction and carbon deposition for CaSO₄ oxygen carrier in chemical-looping combustion: A first-principle study and reaction equilibrium analysis

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SURFACES AND INTERFACES 2021年 25卷

作者： Hou, Fengxiao Jin, Jing Liu, Dunyu Kou, Xuesen Yang, Haoran Wang, Yongzhen Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Linyi Univ Sch Civil Engn & Architecture Linyi 276000 Shandong Peoples R China

To understand the reaction mechanism of chemical looping combustion with calcium-based oxygen carrier, the competition mechanisms between reduction reaction and carbon deposition for CaSO4 oxygen carrier were calculated by density functional theory and simulated by chemical reaction equilibrium analysis. In this paper, the reaction paths of reduction reaction and carbon deposition at different CaSO4(010) surface outer oxygen content (100%, 75%, 50%, 25%) were studied, and the reversibility of the reaction was fully considered. Furthermore, based on the kinetic analysis of the transition state theory, the kinetic parameters of the elementary reaction were obtained. Moreover, the reaction equilibrium simulation revealed the competition of reactions under different conditions. The results show that the energy barriers of forward and reverse reactions decrease with the oxygen content decreasing on the CaSO4 (010) outer layer surface in the reduction reaction. Besides, the forward energy barriers at each stage are lower than the reverse energy. In the carbon deposition reaction, the energy barriers of the forward reaction are higher than the reverse reaction, and the energy barriers of the reverse reaction gradually increase with oxygen content decreasing. The kinetic analysis results show the ratelimiting steps of forward and reverse reaction in reduction reaction are 75% and 25% oxygen content stage. According to the reaction equilibrium, the conversion rate of CO oxidation to CO2 decreases with temperature increasing, and the conversion rate of carbon deposition increases. The rate of CO oxidation to CO2 increase and the occurrence of carbon deposition reaction decrease with oxygen carrier ratio increasing. Thus, when the oxygen carrier is insufficient or most of CaSO4 is reduced, the carbon deposition reaction occurs easily.

关键词： Chemical-looping combustion Heterogeneous reaction Carbon deposition Kinetic analysis Reaction equilibrium

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Freezing of a nanofluid droplet: From a pointy tip to flat plateau

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APPLIED PHYSICS LETTERS 2021年第14期118卷 141602-141602页

作者： Zhao, Y. Yang, C. Cheng, P. Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China China Aerodynam Res & Dev Ctr Key Lab Icing & Anti Deicing Mianyang 621000 Sichuan Peoples R China Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore 639798 Singapore Shanghai Jiao Tong Univ Sch Mech Engn MOE Key Lab Power Machinery & Engn Shanghai 200240 Peoples R China

Understanding the dynamics during freezing of nanofluid droplets is of importance from both fundamental and practical viewpoints. It is known that a universal pointy tip is formed on the top of a frozen water droplet [Marin et al., Phys. Rev. Lett. 113(5), 054301 (2014)]. Here, we report that the formation of a pointy tip is broken down due to the presence of nanoparticles;instead, the top of a frozen nanofluid droplet exhibits a flat plateau shape and such a plateau becomes larger at higher particle concentrations. We show that the phenomenon of such shape changes in freezing nanofluid droplets is universal, independent of contact angle, droplet volume, particle size, and particle material. We propose an analytical model to attribute the plateau formation to a capillary driven compensating flow due to segregated particles moving along the freezing interface.

关键词： Drops

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Experimental study on dynamic thermal environment of passenger compartment based on thermal evaluation indexes

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SCIENCE PROGRESS 2020年第3期103卷 36850420942991-36850420942991页

作者： Zhang, Liang Qi, Liangkui Liu, Jianhua Wu, Qingqing Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

In this article, the thermal environment and the human thermal comfort of car cabin under different driving states in summer were studied experimentally. The weighted predictive mean vote model and the weighted equivalent temperature model were used for calculation and compared with the experimental values. The experimental results show that the air temperature and relative humidity distribution in cabin are affected by the space position and driving state. The temperature of the cabin seat, which is affected by solar radiation and crew, in the heating stage is slightly higher than the air temperature, while the cooling rate in the cooling stage is much lower than the air temperature. The predictive mean vote model and the equivalent temperature model are basically consistent with the actual thermal comfort of human body under the idle and driving conditions with the change of time. The prediction accuracy of the two models under the idle condition is higher than that under the driving condition, and the overall prediction accuracy of the equivalent temperature model is higher than that of the predictive mean vote model.

关键词： Vehicle cabin thermal environment thermal comfort predictive mean vote model equivalent temperature model

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Cavitation characteristics of rotary vane pump in aeroengine lubricating oil system and their effects on pump performance

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Hangkong Dongli Xuebao/Journal of Aerospace power 2025年第7期40卷

作者： Wang, Ge Wang, Yijin He, Denghui Yang, Lina Cao, Ming Bai, Bofeng State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China Xi’an University of Technology Xi’an710048 China Department of Power Engineering Institute of Water Resources and Hydro-electric Engineering Xi’an University of Technology Xi’an710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Commercial Aircraft Engine Company Limited Aero Engine Corporation of China Shanghai200241 China Shanghai Center of Research for Commercial Aircraft Engine Engineering Techniques Shanghai200241 China

To meet the demand for high-performance oil pumps in the lubricating oil system of high thrust and high-speed aeroengines, numerical simulation was conducted on a new high-speed rotary vane oil pump. The Mixture multiphase flow model, Singhal full cavitation model, and renormalization group（RNG） k-Ε turbulence model were employed for numerical calculation, and the reliability of the numerical simulation method was verified through experiments. Then, cavitation characteristics of the rotary vane pump and its impact on pump performance under different inlet pressure and oil temperature conditions were analyzed. The results showed that the cavitation gas was mainly distributed in the volume chamber on the oil suction side, as well as on the suction surface of the rotary vane and near the inner wall of the rotor. With the decrease of inlet pressure and the increase of oil temperature, the cavitation phenomenon inside the rotary vane pump intensified, and the cavitation gas increased, which in turn led to a decrease in the average oil discharge flow rate at the pump outlet and a decrease in volumetric efficiency. When the inlet pressure dropped to 40 kPa and the temperature rose to 373.15 K, the average oil discharge flow rate and volumetric efficiency at the pump outlet both significantly decreased. The pressure pulsation at the monitoring point exhibited low-frequency and high-amplitude pulsation characteristics. The cavitation of the rotary vane pump affected not only its oil discharge and volumetric efficiency, but also the stable and reliable operation of the pump. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Vane pumps

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Mechanism and Kinetics Study on Low-Temperature NH3-SCR Over Manganese-Cerium Composite Oxide Catalysts

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INDUSTRIAL & engineering CHEMISTRY RESEARCH 2019年第51期58卷 22763-22770页

作者： Lin, Feng Wang, Qiulin Zhang, Jianchao Jin, Jing Lu, Shengyong Yan, Jianhua Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Zhejiang Univ Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China

Titanium dioxide-supported manganese oxide and cerium oxide noted as MnOx/TiO2, CeO2/TiO2, and MnOx-CeO2/TiO2 were prepared by sol gel method and their low-temperature (<200 degrees C) catalytic activity toward selective catalytic reduction (SCR) of NO with NH3 were evaluated. The MnOx-CeO2/TiO2 catalyst exhibited optimal low-temperature performance that is nearly 98% of NO was abated below 200 degrees C. That is because MnOx/TiO2 combined with CeO2 improves redox ability and surface acidity of the catalyst, mainly due to the incorporation of Mn atoms into bulk CeO2 that creates active Mn-O-Ce structures. In situ Fourier transform infrared (FTIR) spectroscopy suggested that the coordinated NH3 on Lewis acid sites were favored to react with NO and the NH3-SCR over MnOx-CeO2/TiO2 catalyst mainly followed the E-R mechanism at 200 degrees C. Furthermore, the reaction rate constant and apparent activation energy of the NH3-SCR reaction on the MnOx-CeO2/TiO2 catalyst confirmed the promotional effects of Ce addition on the activity of Mn-based catalyst.

关键词： Catalysts Catalytic reactions Oxides Transition metals Adsorption

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heat generation measurement and thermal management with phase change material based on heat flux for high specific energy power battery

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APPLIED THERMAL engineering 2021年 194卷 117053-117053页

作者： Wang, Haimin Wang, Yufei Hu, Feng Shi, Weijie Hu, Xuebin Li, Huanqi Chen, Si Lin, Hao Jiang, Chenglong Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Dongfeng Commercial Vehicle Co Ltd Dongfeng Commercial Vehicle Tech Ctr Wuhan 430056 Peoples R China China Automot Technol & Res Ctr Co Ltd Tianjin 300300 Peoples R China

LiNi0.8Co0.1Mn0.1O2 (NCM811) lithium-ion battery is a kind of high specific energy power battery. By directly measuring the heat flux on the surface of a 21700-type cylindrical battery and the temperature of its inner center, the heat generation rate, the heat energy dissipated and the electric energy released at different discharge rates are all obtained. The results turn out that increasing the discharge rate will reduce the electric energy and correspondingly increase the heat energy released, while the total amount of both remains unchanged. When the discharge rate increases from 1C to 2.5C, the ratio of discharge heat generation to discharged energy increases from 2.89% to 7.89%. According to the heat generation rate obtained from the experimental results, a single cylindrical cell structure and hexagonal cell module were designed for different discharge rates with high thermal conductivity graphene paraffin composite phase change material (PCM). PCM structure can well manage the thermal parameters, which helps to maintain the stability and consistency of battery temperature. The distance between two adjacent batteries has a greater impact on the temperature distribution of the battery module during high rate discharge, and monitoring the change of heat flux can predict the failure of the thermal management of the battery in advance. It is a beneficial attempt to adopt PCM to manage the temperature field of the battery pack and use heat flux to monitor the solid state of PCM, which is also very helpful for the safe operation of the battery system.

关键词： power battery heat generation rate heat flux Energy distribution PCM thermal management

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Experiment and Simulation for Air-Cooling the Tabs of a Pouch Battery Module with Distributed Resistance Model

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JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2021年第7期168卷 070548-070548页

作者： Wang, Haimin Chen, Si Ji, Zhiyuan Li, Huanqi Jiang, Chenglong Lin, Hao Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China China Automot Technol & Res Ctr Co Ltd Tianjin 300300 Peoples R China Dongfeng Commercial Vehicle Co Ltd Dongfeng Commercial Vehicle Tech Ctr Wuhan 430056 Peoples R China

A novel distributed electric resistance model is used to describe the heat generation characteristics of a cell with the electric resistance of a cell is divided into three parts: the main body, two current collectors, and two electrode tabs. This model was used to simulate the effects of natural convection cooling and forced air convection cooling on tabs of a lithium-ion pouch battery, and the effects of dry air and wet air on the cooling effect. The parameter of the module cooling coefficient (MCC) was introduced to evaluate the effect of thermal management. The results show that wet air has a better cooling effect than dry air, but the cooling effect of wet air with 15% and 75% relative humidity is almost the same, and increasing the inlet air velocity can significantly improve the cooling effect. In addition, the index MCC of positive and negative tabs and the heat flux during cooling process are quantified, so as to provide better service for thermal management design.

关键词： Temperature control

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Pyrolysis characteristics and non-isothermal kinetics of waste wood biomass

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ENERGY 2021年 226卷 120358-120358页

作者： Li, Jingjing Dou, Binlin Zhang, Hua Zhang, Hao Chen, Haisheng Xu, Yujie Wu, Chunfei Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Sch Energy & Power Engn Shanghai 200093 Peoples R China Chinese Acad Sci Inst Engn Thermophys Beijing 100190 Peoples R China Queens Univ Belfast Sch Chem & Chem Engn Univ Rd Belfast BT7 1NN Antrim North Ireland

The evaluation of thermochemical characteristics and the development of kinetic model for pyrolysis of waste biomass are more challenging. In this study, the mass losses, intermediates evolved and products formed during pyrolysis of waste wood biomass were determined by coupling DSC/TGA-DTG/GC-MS/FTIR to improve the understanding of conversion processes and decomposition characteristics. The improved non-isothermal kinetics method was proposed by introducing the function of mechanisms, the activation energies and pre-exponential factors were estimated iteratively by regression to enhance modeling accuracy. The results indicated the gases of CO, CO2, CH4, H-2 and the liquids of N-containing organics, esters, ketons and carboxylic acids were the most dominated products evolved. The pyrolysis of waste wood biomass could be divided into three phases, and with the increase of heating rates, the caloric requirement for pyrolysis was greatly increased. The random nucleation and one-dimensional diffusion predicted accurately the main (second) and third phases in the pyrolysis of waste wood biomass and waste camphor presented lower activation energies than waste bamboo. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Pyrolysis of waste wood biomass Improved non-isothermal kinetics DSC/TG-DTG/GC-MS/FTIR

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Promote anti-/de-frosting by suppressing directional ice bridging

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INTERNATIONAL JOURNAL OF heat AND MASS transfer 2021年第PartA期165卷 120609-120609页

作者： Zhao, Y. Yan, Z. Zhang, H. Yang, C. Cheng, P. Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China South China Normal Univ South China Acad Adv Optoelect Guangdong Prov Key Lab Opt Informat Mat & Technol Guangzhou 510006 Peoples R China Nanyang Technol Univ Sch Mech & Aerosp Engn Singapore 639798 Singapore Shanghai Jiao Tong Univ Sch Mech Engn DOE Key Lab Power Machinery & Engn Shanghai 200240 Peoples R China

Condensation frost is one of the most common types of icing encountered in nature and industrial applications, while its accretion induces multiple non-negligible negative impacts. Many passive anti-/de-frosting approaches by tailoring surface topology and chemistry have been reported recently. To date, however, reliable engineered surfaced that can be compatible with heat exchangers from both mechanical and economic perspectives are limited. In this paper, we present a hierarchically structured surface that can profoundly reduce the frost coverage, and meanwhile promote the rapid removal of frost melts. This surface consists of microgroove pattern and nanoblade structure, where the former provides preferential sites for the growth of condensed droplets, and the latter promises a robust water repellent nature. During frosting, the ice phase spreads only among droplets on groove edges while condensed droplets in valleys are completely evaporated off, yielding a typical pattern that ice stripes distribute discretely in the dry background. During defrosting, frost melts coalesce into large droplets that spontaneously depart the substrate surface. Our results open up a new avenue for surface engineering, particularly on the design of economic and scalable anti-/de- frosting surfaces. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Anti-frosting De-frosting Hierarchical structure Superhydrophobic surface

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