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An improved thermal contact resistance model for pressed contacts and its application analysis of bonded joints

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An improved thermal contact resistance model for pressed con...

The 5thInternational Conference on Cryogenics and Refrigeration ICCR 2013(第五届国际低温制冷会议)

作者： Zheng J. Li Y.Z. Lai H. Zhao J. State Key Laboratory of Multiphase Flow in Power Engineering Xi''anJiaotongUniversityXi''an 710049China Institute of Refrigeration and Cryogenics Engineering Xi''an Jiaotong UniverstiyXi''an 710049China Institute of Refrigeration and Cryogenics EngineeringXi''an Jiaotong UniverstiyXi''an 710049China

Gas-phase synthesis of Ti_(2)CCl_(2) enables an efficient catalyst for lithiumsulfur batteries

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The Innovation 2024年第1期5卷 33-40页

作者： Maoqiao Xiang Zihan Shen Jie Zheng Miao Song Qiya He Yafeng Yang Jiuyi Zhu Yuqi Geng Fen Yue Qinghua Dong Yu Ge Rui Wang Jiake Wei Weiliang Wang Haiming Huang Huigang Zhang Qingshan Zhu Chuanfang John Zhang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of the Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China China Nuclear Power Engineering Co. Ltd.117 West Third Ring RoadNorth SectionBeijing 100840China College of Materials Science&Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

MXenes have aroused intensive enthusiasm because of their exotic properties and promising ***,to date,they are usually synthesized by etching *** synthetic technologies provides more opportunities for innovation and may extend unexplored ***,we report a bottom-up gas-phase synthesis of Cl-terminated MXene(Ti_(2)CCl_(2)).The gas-phase synthesis endows Ti_(2)CCl_(2) with unique surface chemistry,high phase purity,and excellent metallic conductivity,which can be used to accelerate polysulfide conversion kinetics and dramatically prolong the cyclability of Li-S ***-depth mechanistic analysis deciphers the origin of the formation of Ti_(2)CCl_(2) and offers a paradigm for tuning MXene chemical vapor *** brief,the gas-phase synthesis transforms the synthesis of MXenes and unlocks the hardly achieved potentials of MXenes.

关键词： synthesis phase lithium

Dynamic modeling of a NG-fueled SOFC-PEMFC hybrid system coupled with TSA process for fuel cell vehicle

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Energy Procedia 2019年 158卷 2215-2224页

作者： Zhen Wu Meng Ni Pengfei Zhu Zaoxiao Zhang Building Energy Research Group Department of Building and Real Estate The Hong Kong Polytechnic University Hong Kong P.R. China State Key Laboratory of Multiphase Flow in Power Engineering School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an 710049 P.R. China

Fuel cell power technology has drawn extensive attentions due to its high efficiency, low emission and noise. Solid oxide fuel cell (SOFC) could generate the power by diverse fuels, such as natural gas (NG), while proton exchange membrane fuel cell (PEMFC) only feeds on pure H 2 . More and more attentions are paid on the combination of SOFC and PEMFC for high efficiency and convenient refueling in the practical applications. To obtain H 2 fuel with high purity from SOFC as a reformer, the gas processing subsystem for H 2 separation and purification should be applied between SOFC and PEMFC. In this present study, the gas processing subsystem, consisting of water gas shift (WGS) and thermal swing adsorption (TSA), is introduced into the SOFC-PEMFC hybrid system. Then, the SOFC-WGS-TSA-PEMFC hybrid system is modelled to investigate the transient behaviors under different operations. The simulation results show that the SOFC-WGS-TSA-PEMFC hybrid system has an improved energy conversion efficiency of approximately 64%, which is higher than the only-SOFC and the reform-PEMFC. The waste heat recovery for driving the TSA reaction accounts for the higher net electricity efficiency compared with the SOFC-PEMFC hybrid system based on the pressure swing adsorption (PSA) for H 2 separation. Since the SOFC and PEMFC have completely different transient responses to the change of the loading, the influences of operating conditions of fuel cell vehicles on the transient behaviors of single SOFC and PEMFC and the overall performance of the SOFC-WGS-TSA-PEMFC hybrid system are further investigated. Through the analysis and discussion based on the dynamic modelling, the operation strategy is unveiled in this paper for the performance optimization of the hybrid system when installed in the fuel cell vehicles.

关键词： SOFC PEMFC Metal hydride Transient behavior High efficiency

Combining Core-Shell Construction with Alloying Effect for High Efficiency Ethanol Electrooxidation: A Case of Core-Shell Au@Fepd Nanoparticles with Sub-Nano Alloy Shells

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SSRN 2020年

作者： Liu, Danye Zeng, Qing Liu, Hui Hu, Chaoquan Chen, Dong Xu, Lin Yang, Jun State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemistry and Materials Science Jiangsu Key Laboratory of New Power Batteries Nanjing Normal University Nanjing210023 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

Combining the core-shell construction with an alloying effect is an effective way to optimize the electronic and lattice strain effects generated in core-shell configurations for achieving highly catalytic efficiency for a given electrochemical reaction. To demonstrate this concept, we herein report the use of core-shell Au@FePd nanoparticles with an Au core and a sub-nano FePd alloy shell to promote the electrocatalytic oxidation of ethanol. In these core-shell structures, the Au core modifies the electronic configuration of Pd atoms through differences in electronegativity, while the Fe component in thin shells reduces the lattice expansion of Pd induced by the Au core, both of which endows the Pd shell with an appropriate d-band center, favorable for the electrooxidation of ethanol molecules through C1 pathway. In particular, the as-prepared core-shell Au@FePd nanoparticles at an optimized Fe/Pd ratio of 0.5/1 (Au@FePd-0.5) exhibit a mass activity of 13.3 A mg-1 and a specific activity of 20.2 mA cm-2 for the ethanol electrooxidation in an alkaline medium, which significantly outperform those of a majority of the recent reported Pd-based electrocatalysts. This study highlights the concept of engineering the geometry and surface composition of a nanostructure for designing highly efficient electrocatalysts for a large variety of electrochemical applications. © 2020, The Authors. All rights reserved.

关键词： Shells (structures)

Investigation of the Effect of Phosphate in Wastewater on the Electrochemical Performance of Cofe-Ldh@Ni Foam Adsorbents as Supercapacitor Electrode Materials

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SSRN 2022年

作者： Hong, Xianyong Shi, Mingxing Li, Jinghua Xia, Mingzhu Du, Ping Wang, Fengyun School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China

Reducing P(V) in the environment is the key to solving the problem of eutrophication in water bodies. In this work, CoFe-LDH@NF composites were successfully prepared by a simple one-step hydrothermal method and efficiently obtained P(V) from wastewater. The P(V) in the phosphate undergoes a reduction reaction under a high temperature H2 atmosphere and reacts with the metal salt to form a metal phosphide (Co-Fe-P@NF). The electrochemical analysis shows that the reaction of P with metal elements to form the corresponding phosphide can effectively enhance the electrochemical properties of the composite. The specific capacitance of Co-Fe-P@NF is as high as 3.71 F/cm2 at a current density of 1 mA/cm2 and the specific capacitance retention rate is 81.7% after 2000 cycles of charging and discharging at a current density of 10 mA/cm2 . Furthermore, asymmetric supercapacitors (ASCs) were assembled with activated carbon (AC) as the negative electrode and Co-Fe-P@NF as the positive electrode with a voltage window of up to 1.6 V. Co-Fe-P@NF//AC ASC device allows the timer to operate generally for more than 75 mins. The excellent energy storage performance on the supercapacitor electrode material provides an effective solution for recycling the adsorbent. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

Hydrothermal pretreatment of protein-rich substrate:Modified physicochemical properties and consequent responses in its anaerobic digestion

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Carbon Resources Conversion 2023年第1期6卷 1-10页

作者： Fa Qiao Guangyi Zhang Jie Fan Hang Zhang Bowen Shi Jiancheng Yang Jianling Zhang Zhennan Han Shenyang University of Chemical Technology Shenyang 110142Liaoning ProvinceChina School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Urban Construction Wuhan University of Science and TechnologyWuhan 430081Hubei ProvinceChina China Power Engineering Consulting Group Co. LtdBeijing 100120China

Wasted tofu rich in protein was subject to hydrothermal pretreatment(HTPT)under different conditions(at 120,140,160 and 180℃;for 0,30,60 and 90 min)followed by biochemical methane potential(BMP)tests,and 140℃and 0 min were found to be respectively the best temperature and duration for HTPT of tofu in terms of its biogas *** the under the optimal conditions(140℃,0 min)the accumulative methane yield reached up to 510.9 mL⋅(gVS)-1,which was 26.98%higher than that without HTPT(402.3 mL⋅(gVS)-1).The start-up process of continuous anerobic digestion(AD)of the tofu before and after hydrothermal treated(HT)at the optimal HTPT conditions(140℃,0 min)was examined,to investigate and compare how their consequent AD responded to *** was found that,for start-up of continuous AD,the HT tofu delivered more balanced nutrients and thus led to more stable AD and quicker biogas ***,HTPT generated products refractory to biodegradation,to slightly decrease the total biogas *** AD of HT tofu some weak ammonia-tolerant microbes,such as methylotrophic methanogens,survived and played indispensable *** of living microbial community structure indicated that,some hydrolytic acidification bacteria intolerant to ammonia nitrogen(such as Proteobacteria)were always active and appeared at high *** viable methylotrophic methanogens,*** M2,took obvious responsibilities in start-up of the AD for HT tofu.

关键词： Hydrothermal pretreatment(HTPT) Protein-rich substrate Anaerobic digestion(AD) Biogas Microbial community structure

Thermodynamic Analysis and Optimization of Two-Step Supercritical Water Desorption-Gasification System of Oily Sludge

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SSRN 2024年

作者： Zhang, Chenghao Wang, Gaoyun Zhao, Qiuyang Gao, Yunbo Ge, Zhiwei Jin, Hui Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No. 28 Xianning West Road Xi’an710049 China Technical Inspection Center Sinopec Shengli Oilfield Company Dongying257000 China

The two-step supercritical water desorption-gasification (TSSCWDG) technology can significantly improve the gasification efficiency of oil sludge. However, few works have been conducted to explore the influence of operating parameters on this process. In this paper, a novel desorption-gasification process modeling was constructed based on the supercritical water gasification (SCWG) of oily sludge and the influences of different operating parameters on the system efficiencies were investigated. Increasing the separation temperature and the desorption levels can achieve the rapid improvement of the efficiencies of the TSSCWDG system, but more desorption levels may increase the complexity of the system and the operating cost. The desorption temperature had a relatively small impact on the system efficiencies, but the lower desorption temperature was beneficial to the utilization of industrial waste heat and decreasing the operating cost. Moreover, the TSSCWDG system was optimized and analyzed, and the optimized system had achieved the energy matching between the gasification products and unites, resulting in significant reduction of the irreversible losses in each unit, which the energy efficiency of the optimized system reached 83.4%. This work could provide essential theoretical guidance for the scale-up and design of the industrial application of SCWG of oil sludge with hydrogen production. © 2024, The Authors. All rights reserved.

关键词： Desorption

Thermodynamic Analysis on Supercritical Water Gasification of Oily Sludge Using a Continuous Two-Step Method

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SSRN 2024年

作者： Wang, Gaoyun Zhang, Chenghao Zhao, Qiuyang Gao, Yunbo Jin, Hui Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No. 28 Xianning West Road Xi’an710049 China Technical Inspection Center Sinopec Shengli Oilfield Company Dongying257000 China

A large amount of oily sludge is produced every year around the world and the traditional treatment techniques for oily sludge have deficiencies of incomplete processing and high energy consumption. Supercritical water gasification (SCWG) technology can cleanly convert oily sludge into hydrogen-rich gas and does not require an energy-consuming drying process. This work constructed the desorption-gasification two-step SCWG system based on the previous experimental study and investigated the influences of feed concentration, gasification temperature and sludge compositions on the energy efficiency and exergy efficiency of the system. The results showed that the two-step system had higher energy efficiency and exergy efficiency, as well as better adaptability to various sludge compositions under maintaining high efficiency conditions. The energy efficiency and exergy efficiency of the two-step system were 61.2% and 45.3% respectively under the gasification temperature of 600 ℃ and the feed concentration of 100wt%, which were 91.95% and 93.67% higher than those of the single-step system. Additionally, the desorption unit of two-step system operated at lower temperature, resulting in decreased use of high-temperature resistant materials and reduced economic costs. This research provides valuable insights into the construction and optimization of two-step SCWG of oily sludge. © 2024, The Authors. All rights reserved.

关键词： Desorption

Preliminary safety analysis of the PWR with accident-tolerant fuels during severe accident conditions

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Annals of Nuclear Energy 2015年 80卷 1-13页

作者： Xiaoli Wu Wei Li Yang Wang Yapei Zhang Wenxi Tian Guanghui Su Suizheng Qiu Tong Liu Yongjun Deng Heng Huang State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University No. 28 Xianning West Road Xi’an Shanxi 710049 China China Nuclear Power Technology Research Institute A-1101 Fengde Plaza No. 6 Hangkong Road Chengdu Sichuan 610000 China

Experience gained in decades of nuclear safety research and previous nuclear accidents direct to the investigation of passive safety system design and accident-tolerant fuel (ATF) system which is now becoming a hot research point in the nuclear energy field. The ATF system is aimed at upgrading safety characteristics of the nuclear fuel and cladding in a reactor core where active cooling has been lost, and is preferable or comparable to the current UO 2 –Zr system when the reactor is in normal operation. By virtue of advanced materials with improved properties, the ATF system will obviously slow down the progression of accidents, allowing wider margin of time for the mitigation measures to work. Specifically, the simulation and analysis of a large break loss of coolant accident (LBLOCA) without ECCS and extended station blackout (SBO) severe accident are performed for a pressurized water reactor (PWR) loaded with ATF candidates, to reflect the accident-tolerance of ATF.

关键词： Safety analysis Accident-tolerant Severe accident