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4th International Conference on Information Science, Parallel and Distributed Systems, ISPDS 2023

作者： Wang, Weibin Wei, Xutao Xi'an Fanyi University Department of Computer Science Xi'an China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China

ISBN: (纸本)9798350337181

The numerical simulation of the turbulent combustion is identified as one of the most promising methods on the designs of the combustion devices, for example: the internal combustion engine and gas turbine. This mainly depends on the development of parallel computing technique. However, the computational efficiency for different cases on different compute nodes and number of cores still needs to be studied. On the other hand, due to the requirements from the aim of peaking carbon dioxide emissions before 2030 and achieving carbon neutrality before 2060, modern energy system is requesting low carbon or carbon free fuels, such as ammonia (NH3). Therefore, the simulations of ammonia/air flame were performed in present investigation. The comparison between simulation cases on different compute nodes and number of cores illustrates that different cases requires different number of cores to achieve the best computational efficiency. The computational efficiency of each compute nodes are dissimilar, which can decrease the efficiency. Meanwhile, the methods in present study can predict the ammonia/air flames. The initial condition of velocity fluctuation is necessary for simulating turbulent flame. The wrinkles of the flames can be well predicted by the velocity fluctuation initial boundary condition. © 2023 IEEE.

关键词： Computational efficiency

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Study on startup characteristics of prototype once-through steam generator for China fast reactor

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International Journal of Advanced Nuclear Reactor Design and Technology 2022年第1期4卷 26-35页

作者： Min, Xin Zhang, Dalin Xu, Rongshuan Wang, Shibao Chen, Youchun Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Once-through steam generator (OTSG) is a vital heat transfer equipment of China Fast Reactor-600 (CFR-600), and its startup characteristics are of great importance to the safe operation of nuclear power plant. In this paper, first of all, the Thermal-hydraulic analysis Code Of Sodium heated once-through Steam generator (TCOSS) has been further optimized, and the code was introduced in the text. Secondly, the Steam Generator Test Facility (SGTF) and India Commercial Fast Breeder Reactor (CFBR) were selected for steady-state verification, and the feedwater flow rate increase condition of the prototype OTSG experiment was selected for transient verification. All the verifications were in good compliance, which proved the reliability of the TCOSS code for subsequent calculation of startup conditions. Finally, taking the prototype OTSG of CFR-600 as the research object, and the transient characteristics of cold startup and hot startup have been predicted and analyzed. The results show that both processes of cold startup and hot startup for prototype OTSG can be realized stably. The simulation results of startup processes showed a good agreement with expectations, which can provide support for the development of CFR-600 steam generator. © 2022 Xi'an Jiaotong University

关键词： Steam generators

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Plasma catalytic collaborative decomposition of methanol to hydrogen production

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International Journal of Hydrogen Energy 2025年 143卷 265-275页

作者： Shuming Li Erjiang Hu Geyuan Yin Zuohua Huang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 People's Republic of China

A novel plasma-assisted methanol decomposition kinetic model is developed through experimental investigations which can reasonably predict the species concentration at different voltages. The methanol decomposition does not occur at 600 K without plasma, whereas it initiates at 450 K under plasma conditions. This is attributed to the new reactions between the high-energy electrons and Ar∗ with the methanol under the electric field. However, under plasma alone, H 2 selectivity is low as the formation of CH 3 , which decreases the fluxes of H-abstraction reactions, such as CH 2 OH + H CH 2 O + H 2 . With plasma-catalyst, 15 % increase in H 2 selectivity and 12 % increase in CH 3 OH conversion are achieved at 493 K and methanol tends to be converted more to CH 3 O than to CH 2 OH or CH 3 compared with plasma alone, which increases the CH 3 O adsorbed on the surface of catalyst, facilitating the chain reaction (CH 3 O→CH 2 O→CO + H 2 ) and inhibits the conversion of CH 3 O/CH 2 OH to CH 3 and CH 2 by plasma, and as a result, the CH 3 OH conversion rate and H 2 yield rate increase.

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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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A Simulation Study of Solar Thermal Steam Generation for Thermal Recovery of Thick Oil Based on Aspen Plus 4

A Simulation Study of Solar Thermal Steam Generation for The...

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2022 4th International Conference on New Energy System and Electrical engineering, NESEE 2022

作者： Chen, Pengfei Chen, Kang Peng, Huaiwu Zhang, Yanlong Bawaa, Baercheng Zhao, Qiuyang Institute of Solar Engineering Technology Northwest Engineering Corporation Limited PowerChina Xi'an China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China

High-temperature steam injection is a common means of thermal recovery of thick oil. Although the steam injection boiler currently used for thick oil injection can achieve fast start-stop control, the power consumption of the pump is large, and the boiler control is demanding. Besides, a large amount of fossil fuel is needed to supply the heat required for steam heating. Using solar thermal to realize the transformation of solar energy-molten salt heat energy-steam energy can effectively reduce the burning of fossil fuels and realize clean thermal recovery of thick oil. To ensure the actual demand of thermal recovery of thick oil, it is necessary to determine a reasonable steam evaporation volume and vapor phase fraction. This paper simulates a solar thermal heat exchange system for molten salt-steam based on Aspen Plus. The simulation results show that the heat load and required solar panel area of all heat exchangers rise when the evaporation volume increases. However, the superheater grows most slowly. When the vapor phase fraction at the evaporator outlet rises to 1, there is no phase change heat transfer in the superheater, and its heat load plummets to 230 kW. © Published under licence by IOP Publishing Ltd.

关键词： Steam

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Supersonic shear layer characteristics of two fluids with a splitter plate

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 1-10页

作者： Bai, Yuping Hong, Yibo Zhao, Quanbin Chen, Weixiong Chong, Daotong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Supersonic shear layer development affects mixing between the primary and secondary fluids in a supersonic ejector substantially. The splitter plate plays a key role in shear layer development in the near-trailing-edge region. In this paper, supersonic shear layers with various splitter plate thicknesses are calculated and analyzed. Two types of instability modes are found when various splitter plate thicknesses are used. The shock wave strength and absolute unstable region determine the instability modes. Shock waves can limit instability development but an absolute unstable region promotes instability development. Velocity thickness growth rates are found to be the result of the merging process between two or more adjacent vortices in the transition region. The number of vortices that merge depends on the ratio of the vortex shedding and nature frequencies. The velocity thickness growth rates are larger under the local instability mode than under the global instability mode since three vortices merge under the former mode but two vortices merge under the latter. This study may provide a helpful reference for the design of supersonic ejectors. © 2021 Xi'an Jiaotong University

关键词： Vortex flow

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Experimental Study on Non-Isothermal Mixing Characteristics of Water in T-Junction

Experimental Study on Non-Isothermal Mixing Characteristics ...

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2024 Academic Conference of China Instrument and Control Society, ACCIS 2024

作者： Liu, Shuhan Guo, Wencang Lei, Xianliang Yuan, Zhaojun Meng, Shuqi Jin, Desheng Xi'an Jiaotong University State Key Laboratory of Multiphase Flow Engineering Xian China China Nuclear Power Technology Research Institute Co. Ltd. Shen Zhen Guangdong China

ISBN: (纸本)9798350350326

T-junction is an essential component in piping system of various thermal systems. When hot and cold fluid mixing in the T-junction, several compound mechanisms (like turbulent mixing, turbulent penetration, fluid stratification) make the mixing characteristics more complex. To clearly reveal such mixing mechanism with non-isothermal fluids, an experimental study was conducted with Ultrasound Doppler Velocimetry (UDV) and fast-response thermocouples bundle. The results show that the local velocity uncertainty of the UDV is within 10%, the uncertainty of the thermocouple bundle is 0.5°C, and the response time is 66.7 ms. After verification, the mixing characteristics between the main and branch pipe under different momentum ratios and temperature differences were discussed. It is shown that as the momentum ratio decreases, the location of the most intense radial temperature fluctuations and velocity fluctuations shifts towards the lower wall. At the same time, the peak flow rate in the cross-section increases by 35.7% and the main branch fluid mixing is more homogeneous. As the temperature difference increases, the thermal stratification is more pronounced and the velocity fluctuation peak moves towards the upper wall of the pipe. © 2024 IEEE.

关键词： Thermocouples

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Waste heat recovery in the coal-fired power generation integrated with post-combustion 3

Waste heat recovery in the coal-fired power generation integ...

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3rd International Conference on Electrical engineering and Mechatronics Technology, ICEEMT 2023

作者： Yang, Yali Wang, Guiwen Li, Yan Liu, Yongping Fu, Yue Liu, Ming Guoneng Jinjie Energy Co. Ltd Yulin China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9798350303698

Post combustion systems (PCS) are a viable technology option to reduce carbon dioxide in the electricity production. However, the energy-intensive of PCC precludes its wide scale application. As for the optimization of the post combustion system, there is an optimal inlet temperature of the stripper. By optimizing the parameter of the post combustion system, the energy consumption rate of the post combustion system decreased by 1.4 GJ/t CO2 under 100% THA compared to the original post combustion system. The needed heat by the stripper shows a fall with the decrease of the unit load ratio. However, the heat changes of the post combustion system decrease with the decrease of the unit load ratio under 90% absorption rate. The efficiency penalty can be as low as 4.1% through waste heat recovery. © 2023 IEEE.

关键词： Carbon dioxide

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DYNAMIC CHARACTERISTICS AND CONTROL STRATEGY OPTIMIZATION OF A 1000 MW LIGNITE-FIRED power UNIT INTEGRATED WITH PRIMARY AIR HEATER

DYNAMIC CHARACTERISTICS AND CONTROL STRATEGY OPTIMIZATION OF...

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ASME 2024 power Conference, power 2024

作者： Li, Mengjie Li, Maoliang Yin, Chaoqiang Liu, Ming Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Chengdu China Dongfang Electric group Dongfang Boiler Co. LTD Sichuan Zigong China

ISBN: (纸本)9780791888186

Lignite is a kind of low rank coals with abundant reserves, and it is cost-effective for power plants. However, the moisture content is about 30% to 60% for the lignite, and the water carried by the raw lignite is dried in the pulverization system, which will consume much energy. Therefore, high temperature should be maintained for the primary air of the lignite-fired power plants, especially when the power plant operates under low power ratio or with low temperature feed air. In this study, a 1000 MW lignite-fired power system integrated with a primary air heater is proposed and analyzed. In the primary air heater, the low temperature reheated steam is extracted from the boiler to heat the primary air after the air preheater. The integration of primary air heater makes the lignite-fired power system be more complex, which will influence the operational flexibility of the power plant. Therefore, dynamic models of steam turbines and the boiler with waste heat recovery system were developed in this study. The transient characteristics of the unit under load cycling conditions and primary frequency modulation processes were analyzed. Then, control strategy of the primary air heater of turbine and boiler were enhanced based on the simulation results. The results show that the temperature of primary air can be increased by 51-69 °C by the additional air preheater, and the primary frequency modulation capacity can be improved by 8 MW at 50% power load ratio during primary frequency modulation process. Copyright © 2024 by ASME.

关键词： Steam turbines

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Application-oriented hydrolysis reaction system of solid-state hydrogen storage materials for high energy density target:A review

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Journal of Energy Chemistry 2022年第11期31卷 218-238,I0007页

作者： Jing Yao Zhen Wu Huan Wang Fusheng Yang Jianwei Ren Zaoxiao Zhang School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Department of Mechanical Engineering Science University of JohannesburgJohannesburg 2092South Africa State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Hydrogen storage and delivery technology is still a bottleneck in the hydrogen industry *** all kinds of hydrogen storage methods,light-weight solid-state hydrogen storage(LSHS)materials could become promising due to its intrinsic high hydrogen *** reaction of LSHS materials occurs at moderate conditions,indicating the potential for portable *** present,most of review work focuses on the improvement of material performance,especially the catalysts *** part is important,but the others,such as operation modes,are also vital to to make full use of material potential in the practical *** operation modes of hydrolysis reaction have an impact on hydrogen capacity to various *** example,hydrolysis in solution would decrease the hydrogen capacity of hydrogen generator to a low value due to the excessive water participating in the ***,application-oriented operation modes could become a key problem for hydrolysis reaction of LSHS *** this paper,the operation modes of hydrolysis reaction and their practical applications are mainly *** implements of each operation mode are discussed and compared in detail to determine the suitable one for practical applications with the requirement of high energy *** current challenges and future directions are also discussed.

关键词： Solid-state hydrogen storage High energy density Hydrogen generator Hydrolysis reaction Portable applications

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