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Progress and key challenges in catalytic combustion of lean methane

Journal of Energy Chemistry 2022年第12期75卷 173-215,I0005页

作者： Xiangbo Feng Lei Jiang Danyang Li Shaopeng Tian Xing Zhu Hua Wang Chi He Kongzhai Li Xi’an Key Laboratory of Advanced Photoelectronics Materials and Energy Conversion Device School of ScienceXijing UniversityXi’an 710123ShaanxiChina State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming *** quantities of lean methane(0.1–1.0 vol%)are emitted into the atmosphere without any treatment during coal mine,oil,and natural gas production,thus leading to energy loss and greenhouse *** general,it is challenging to utilize lean methane due to its low concentration and flow instability,while catalytic combustion is a vital pathway to realize an efficient utilization of lean methane owing to the reduced emissions of polluting gases(e.g.,NOxand CO)during the *** particular,to efficiently convert lean methane,it necessitates both the designs of highly active and stable heterogeneous catalysts that accelerate lean methane combustion at low temperatures and smart reactors that enable autothermal operation by optimizing heat *** this review,we discuss the in-depth development,challenges,and prospects of catalytic lean methane combustion technology in various configurations,with particular emphasis on heat management from the point of view of material design combined with reactor *** target is to describe a framework that can correlate the guiding principles among catalyst design,device innovation and system optimization,inspiring the development of groundbreaking combustion technology for the efficient utilization of lean methane.

关键词： Lean methane combustion Catalyst design Heat management Reactor optimization Catalytic mechanism

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Experimental Study on Total Pressure Distribution for Sonic Submerged Steam Jet

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AIP Conference Proceedings 2010年第1期1207卷 386-390页

作者： D. D. Pan J. J. Yan G. Y. Liu aState Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

Experiments on the condensation of steam jet submerged in the subcooled water were carried out. The water temperature and the inlet steam pressure were in the range of 293 K–343 K and 0.2–0.6 MPa, respectively. Four essential shapes of steam plume were enumerated. According to the comparisons of the pictures of steam plume with the graphs in the same size, the pressure came to maximum value in the contraction spots, except for the double expansion‐emanative shape. Moreover, pressure distributions of the flow field were characterized by means of drawing isobar. Comparison and discussions on the relationship between steam plume and pressure distributions were given. With the increase of temperature, pressure distributions within steam plume became more complex. Radial pressure distributions were classified according to different regions. Comparisons of the pressure distributions at different water temperature and inlet steam pressure were obtained.

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Startup transient thermal-hydraulic analysis of a lithium heat pipe cooled reactor Core

Startup transient thermal-hydraulic analysis of a lithium he...

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2020 International Topical Meeting on Advances in Thermal Hydraulics, ATH 2020

作者： Liu, Xiao Tian, Zhixing Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, Guanghui Shanxi Engineering Research Center of Advanced Nuclear Energy School of Nuclear Science and Technology Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9780894487774

Heat pipe cooled reactor has been proposed for applying in the space station and underwater exploration featured with high reliability, low noise level and compact structure. A typical design of a heat pipe cooled reactor system is HP-STMCs designed by the University of New Mexico. It is conceptually designed as a fast reactor, lithiumfilled heat pipes that transfer heat to potassium heat pipes radiator and thermoelectric generators. In this paper, a code is developed for studying the operating thermal-hydraulic characteristics of the reactor core, which consists of core thermal-hydraulic model, neutron kinetics model and heat pipe startup model. The highest temperatures of fuel and matrix in reactor core shows at the 2nd channel, which reach 1720K and 1545K from the results of steady-state. As for the startup transient, the code for heat pipe cooled reactor core successfully predicts key parameters during startup transient, such as each layer material temperature of reactor core, a single heat pipe's temperature response and heat rejection power. The code has initially predicted the transient response of the heat pipe cooled reactor under 800W/s and130W/s power increasing rates. It is discussed that the startup strategy of power increasing rates is based on heat pipe transition temperature (916K). This research provides valuable experience for designing and formulating control strategies of the heat pipe cooled reactor. © ATH 2020 - International Topical Meeting on Advances in Thermal *** rights reserved.

关键词： Heat pipes

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Experimental Study on the flow Characteristics of a Plate with a Mechanically Choked Orifice

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Fluid Dynamics & Materials Processing 2021年第1期17卷 97-107页

作者： Ming Liu Xingkai Zhang Dong Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Petroleum Engineering Technology Research Institute of Shengli Oilfield Company SINOPECDongying257000China Shandong Key Laboratory of Heavy Oil Production Technology Shengli Oilfield CompanySINOPECDongying257000China Petroleum Engineering College Yangtze UniversityWuhan430100China

The mechanically choked orifice plate (MCOP) is a new type of device for flow control by which choking conditionsfor incompressible fluids can be obtained with relatively small pressure losses. Given the lack of relevant results anddata in the literature, in the present study, we concentrate on the experimental determination of the flow coefficientfor the annular orifice, the pressure distribution in the MCOP, and the characteristics of the choked flow itself. Asconfirmed by the experimental results, the Reynolds number, the orifice plate thickness, the plug taper, and theeccentricity have an obvious influence on the aforementioned flow coefficient. The pressure drop in the MCOPis mainly generated near the orifice plate, and the pressure upstream of the orifice plate is slightly reduced in theflow direction, while the pressure downstream of the orifice plate displays a recovery trend. The choked flow rateof the MCOP can be adjusted by replacing the spring with a maximum flow control deviation of 4.91%.

关键词： Mechanical choked orifice plate flow control flow coefficient flow characteristics

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Study on Dynamic Characteristics of a 600MW Ultra-Supercritical Double-Reheat Boiler

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Energy Procedia 2019年 158卷 5257-5262页

作者： Zhu Wang Ming Liu Chaoyang Wang Daotong Chong Yunjie Yan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an Shaanxi

Based on the GSE software, the simulation model of an ultra-supercritical double-reheat tower boiler was established, and its reliability was checked with design data. Then, the dynamic characteristics of the ultra-supercritical double-reheat boiler were studied. Simulation results reveal the response times of different input parameters greatly vary. When stepping disturbances to the feed-coal rate, feed-water rate, and feed-water temperature, the response time under feed-water’s temperature disturbance is the longest, which is about 1, 800 s. When the same input parameter disturbs, the output parameters have the same response tendency with different amplitudes. Moreover, the fiercer the disturbance is, the more greatly the parameter changes.

关键词： double-reheat dynamic characteristics GSE

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FLUENT-based computation for a time-space-dependent neutron kinetics model

FLUENT-based computation for a time-space-dependent neutron ...

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2015 ANS Annual Meeting

作者： Zhang, Dalin Ge, Jian Tian, Wenxi Qiu, Suizheng School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University No.28 Xianning West Road Xi'an710049 China

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Optimization of Heliostat Fields Using Advanced Particle Swarm Optimization (APSO) 4

Optimization of Heliostat Fields Using Advanced Particle Swa...

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4th IEEE International Conference on Renewable Energy and power engineering, REPE 2021

作者： Rizvi, Arslan A. Yang, Dong Khan, Talha Ali Xi'An Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China University of Europe for Applied Sciences Department of Data Science Potsdam Germany

ISBN: (纸本)9781665443715

Optical losses account for 40% of all the losses in a central receiver system. These optical losses occur due to factors like shading, blocking, atmospheric attenuation, spillage, cosine loss, and mirror reflectivity. These factors are collectively represented using a single factor known as optical efficiency. There exists a tradeoff among these factors. The unavoidable optical loss can be minimized by optimizing the positions of heliostats in a strategic manner. An advanced particle swarm algorithm is used to optimize the position of heliostats around a dense radial staggered field. An efficiency map of the heliostat field is generated. Using instantaneous optical efficiency as an objective function, a single objective optimization is performed using 30 particles and 2 dimensions (each dimension representing an optimization variable). The results highlight the areas in the heliostat field with the highest losses associated with different components of optical efficiency and their solution. The instantaneous efficiency increases by 1.5% after optimization. © 2021 IEEE.

关键词： Particle swarm optimization (PSO)

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Measurement of the instantaneous detailed flame front structure of syngas turbulent premixed flames at high pressure

Measurement of the instantaneous detailed flame front struct...

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9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Wang, Jinhua Zhang, Meng Huang, Zuohua Kudo, Taku Kobayashi, Hideaki State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Institute of Fluid Science Tohoku University Sendai Miyagi 9808577 Japan

Instantaneous detailed flame front structure of syngas turbulent premixed flames was investigated and compared to that of CH4/air flames. Results show that the flame front of turbulent premixed flames at high pressure is a wrinkled flame front with small scale convex and concave structures superimposed with large scale flame branches. The convex structures are much more frequent than the concave ones on flame front which reflects a general characteristic of the turbulent premixed flames at high pressure. The syngas flames possess much wrinkled flame front with much smaller fine cusps structure compared to that of CH4/air flames and the main difference is on the convex structure. The effect of turbulence on the general wrinkled scale of flame front is much weaker than that of the smallest wrinkled scale. The general wrinkled scale is mainly dominated by the turbulence vortex scale, while, the smallest wrinkled scale is determined by the flame intrinsic instability. The effect of flame intrinsic instability on flame front of turbulent premixed flame is mainly on the formation of a large number of convex cusps structure propagating to the unburned reactants and enlarge the effective contact surface between flame front and unburned reactants.

关键词： Turbulence

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Advances in thermal-related analysis techniques for solid-state lithium batteries

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InfoMat 2023年第4期5卷 77-116页

作者： Jianan Wang Kai Yang Shiyi Sun Qianyue Ma Gong Yi Xin Chen Ze Wang Wei Yan Xinhua Liu Qiong Cai Yunlong Zhao Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy and Power EngineeringXi'an Jiaotong UniversityXi'anthe People's Republic of China Department of Chemical&Process Engineering Faculty of Engineering and Physical SciencesUniversity of SurreyGuildfordUK Advanced Technology Institute University of SurreyGuildfordUK School of Transportation Science and Engineering Beihang UniversityBeijingthe People's Republic of China

Solid-state lithium batteries(SSLBs)have been broadly accepted as a promising candidate for the next generation lithium-ion batteries(LIBs)with high energy density,long duration,and high *** intrinsic non-flammable nature and electrochemical/thermal/mechanical stability of solid electrolytes are expected to fundamentally solve the safety problems of conventional ***,thermal degradation and thermal runaway could also happen in *** example,the large interfacial resistance between solid electrolytes and electrodes could aggravate the joule heat generation;the anisotropic thermal diffusion could trigger the uneven temperature distribution and formation of hotspots further leading to lithium dendrite *** research efforts have been devoted to exploring solid electrolytes with outstanding performance and harmonizing interfacial incompatibility in the past *** have been fewer comprehensive reports investigating the thermal reaction process,thermal degradation,and thermal runaway of *** review seeks to highlight advanced thermal-related analysis techniques for SSLBs,by focusing particularly on multiscale and multidimensional thermal-related characterization,thermal monitoring techniques such as sensors,thermal experimental techniques imitating the abuse operating condition,and thermalrelated advanced *** perspectives are proposed to bridge fundamental studies to technological relevance for better understanding and performance optimization of SSLBs.

关键词： characterization monitoring simulation solid-state batteries thermal technique

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Failure analysis of tube-burst on T91 platen superheater of 600 MW supercritical boiler

Failure analysis of tube-burst on T91 platen superheater of ...

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2020 International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2020

作者： Sun, Ke Wang, Jia'An Yan, Yu Jiang, Jiahao Deng, Lei State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'An Jiaotong University Xi'an710049 China China Huadian Electric Power Research Institute Co. Ltd. Hangzhou310030 China

ISBN: (纸本)9781728182889

In this paper, the specimen of the bursting tubes, original tube and oxide-like debris are analysed in-depth by macroscopic examination, chemical composition analysis, mechanical properties, metallographic examination, scanning electron microscopy and energy spectrum analysis etc.,. It shows that the main reason for the tube-burst is that the original oxide matters or time-original oxide matters blocks the tube, reducing the cooling effect of the steam, and resulting in a short-term overheating of the tube. It is recommended to control the internal cleanliness of boiler equipment and pipest. © 2020 IEEE.

关键词： Scanning electron microscopy

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