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SSRN 2025年

作者： Liu, Yunlian Liu, Mingkai Shen, Yuanhui Li, Yang Gai, Zhongrui Zhang, Ruqi Pan, Ying Jin, Hongguang Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

The integrated CO2 capture and conversion (ICCC) has emerged as a promising and cost-effective pathway for achieving carbon neutrality. However, limited energy-efficient pathways and durable materials for ICCC systems remains challenging. This study proposes a novel approach that synergistically integrates CO2 capture and conversion through a unified chemical framework. The method employs Li-based sorbents for CO2 capture, coupled with CH4-driven sorbent regeneration that is seamlessly integrated with chemical looping dry reforming of methane (CLDRM), enabling in-situ CO2 conversion. By coupling sorbent regeneration with CLDRM, this system enhances decarbonation kinetics through Le Chatelier's principle via continuous CO2 conversion. One-step calcination synthesized Li-based sorbents particles exhibit stable CO2 capture capacity of 5.25 mmol·g-1 within 15 min per cycle, maintaining 7.5-15% operational efficiency over 40 cycles at 600 ℃. In CLDRM, hydrogen radicals from CH4 dissociation promote the conversion of CO2 to intermediates, lowering the apparent activation energy of sorbents regeneration by 29.2%. Through systematic optimization in a fixed-bed reactor, we achieved 90% CO2 uptake and 85% CH4 conversion, with syngas production rates reaching 13.71 mL·min-1·g-1. Notably, the H2/CO molar ratio in syngas stabilizes ~1.6, aligns with iron-based Fischer-Tropsch and methanol synthesis to produce valuable fuels. This integrated system maintains >80% syngas purity with © 2025, The Authors. All rights reserved.

关键词： Activation energy

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Preparation, improvement, and application of metal–organic framework-based sensing materials for gas leakage and emission: A review

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Nano Materials Science 2025年

作者： Liu, Manyi Wang, Liang Ren, Shan Bai, Bofeng Chai, Shouning He, Chi Zheng, Chunli Yin, Xitao Li, Fengguang College of Materials Science and Engineering Chongqing University Chongqing400044 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China School of Physics and Optoelectronic Engineering Ludong University Yantai264000 China School of Materials Science and Engineering Hubei University of Automotive Technology Shiyan442002 China

Industrial gas leaks and flue gas emissions pose significant threats to the safety of industrial operations and the atmospheric ecological environment. Traditional gas sensing materials often struggle to meet the challenges posed by complex industrial environments. Recently, metal-organic framework (MOF)-based gas sensing materials have garnered significant attention in industrial gas detection due to their high sensitivity, selectivity, and tunable properties. The exponential increase in related publications highlights the growing research interest in this field. This paper presents a comprehensive review of the advantages of various types of metal-organic frameworks and their derivatives for detecting industrial gas leaks and flue gas emissions, alongside an introduction of representative MOF synthesis methods. Furthermore, the primary sensing mechanisms of MOF-based gas sensing materials and strategies for enhancing the sensing performance are summarized. The current state of MOF-based gas sensing materials in industrial gas detection is also discussed. Finally, the potential limitations, existing challenges, and future directions of MOF-based industrial gas sensing materials are systematically analyzed, with suggestions for addressing these challenges to advance industrial gas detection technologies. © 2025 Chongqing University

关键词： Application Improvement Industrial gas detection MOF-Based sensing materials Preparation

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Pulse laser induced microbubble motion dynamic in a nanofluid pool

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Physics of Fluids 2025年第5期37卷

作者： Yan, Xin Xu, Jinliang Zhang, Yuqian Wang, Hongbiao Liu, Guohua Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power University Ministry of Education Beijing102206 China

Understanding bubbles motion dynamic with laser interaction is crucial for applications in boiling heat transfer enhancement, precision laser surgery, and cell manipulation. Here, we investigate the micro-bubbles motion dynamic with pulsed laser irradiation. A horizontally projected pulse laser induces the generation of vapor micro-bubbles in nanofluids via plasmonic absorption effects. Parametric variation in pulse energy and laser frequency reveals four distinct bubble flow regimes: (1) microbubble streaming, (2) frequency-regulated bubble orbital motion, (3) bubble self-rotation, and (4) bubble translation combined rotational motion. The frequency-regulated bubble orbital trajectory forms a triangular shape with oscillation amplitudes spanning 16.9-65.0 µm in the x-direction and 21.8-115.7 µm in the y-direction. The angular velocity of bubble self-rotation is about 13.2-20.3 rad/s. By force analysis, we identify Marangoni forces arising from thermal gradients and indirect light pressure resulting from asymmetric laser heating as dominant actuation mechanisms. At low frequencies, spatiotemporal characteristics of Marangoni forces enable bubble self-sustained orbital revolution. Conversely, high-frequency laser irradiation induces stationary bubble confined by Marangoni forces and buoyancy. The laser eccentrically irradiates the bubble, which induces indirect light pressure that drives the bubble's self-rotation. This study revolutionizes bubble motion manipulation by using pulsed lasers, thus enabling precise microfluidic operations. The introduction of laser-guided bubble motion can enhance heat transfer and facilitate advanced mixing and reagent management in chemical processes. © 2025 Author(s).

关键词： Laser surgery

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Flame mode transitions in outer recirculation zone of lean premixed prevaporized n-decane/air swirling flames

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Experimental Thermal and Fluid Science 2025年 168卷

作者： Lin, Wenjun Zhang, Weijie Liu, Hongfang Gao, Zhihao Cai, Xiao Wang, Jinhua Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang621000 China

The outer recirculation zone (ORZ) flame modes and their transition were experimentally investigated in lean premixed prevaporized n-decane/air swirling flames. The flame structure and flow field were measured employing simultaneous CH2O/OH-PLIF and OH-PLIF/PIV laser diagnostics. The ORZ temperature was estimated with thermocouples. Three ORZ flame modes were identified: (1) mode II, characterized by extensive CH2O but nearly absent OH in the ORZ;(2) mode III, with flickering CH2O and OH in the ORZ;(3) mode IV, with flickering OH in the ORZ but nearly without CH2O. Besides, the mode I is defined as the inner shear layer (ISL) flame and mode V is the ISL/outer shear layer (OSL) flame. A theoretical diagram from mode I to V is achieved describing transition from the ISL to ISL/OSL flames. It is confirmed that the presence of CH2O in the ORZ results from the first-stage low-temperature autoignition, which is validated to be predictable with the ignition Damköhler number (Daig) after examining the fluid residence time and ignition delay time. It is found that the high-temperature ORZ flame indicated by the flickering OH radicals cannot be predicted merely using Daig. Instead, the increased flame speed and intensified ISL flame propagation into the ORZ due to the elevated equivalence ratio influence a lot, which can also be promoted by the shear layer vortices. These processes are expected to motivate the entrainment of hot burnt gas into the ORZ thus to form the high-temperature ORZ flame. The flickering ORZ flame is undesirable due to the potentially induced combustion instabilities, and this work can broaden its understanding and provide insights for its suppression. © 2025 Elsevier Inc.

关键词： Thermocouples

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Experimental Study on Supercritical Water Flooding in High Water Cut Heavy Oil Reservoirs

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2025年第5期46卷 1528-1533页

作者： Miao, Yan Zhao, Qiuyang Wang, Xuetao Lei, Yuhuan Gao, Yunbo Jin, Hui Guo, Liejin State Key Laboratory of Multiphase Flow Engineering Xi’an Jiaotong University Xi’an710049 China

Elevated water cut obstructs recovery of heavy oil in later stage of heavy oil reservoir exploitation. This paper simulates such scenarios using one-dimensional sandstone cores filled with saturated oil utilizing hot water flooding. Subsequently, we conducted indoor flooding tests for supercritical water flooding, high-pressure hot water flooding, and superheated steam flooding. Results reveal that supercritical water flooding yields the highest recovery rate (96.27%) and superior in-situ upgrading compared to hot water flooding and superheated steam flooding. The mechanism for enhancing oil recovery via 400◦C, 25 MPa supercritical water flooding in a high water cut heavy oil reservoir environment lies in the occurrence of thermal fluid breakthrough phenomenon, miscible flooding, and hydrothermal pyrolysis of heavy oil under supercritical water conditions. © 2025 Science Press. All rights reserved.

关键词： Petroleum reservoir evaluation

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A 3D-dimensional interconnected structured poly (m-phenylene isophthalamide) nanofiber separator with Li1.5Al0.5Ge1.5(PO4)3 for high-safety lithium-sulfur batteries

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Journal of power Sources 2025年 645卷

作者： Liu, Jianwei Zhu, Lei Chai, Qinqin Sun, Shiyi Yang, Xiaomeng Sun, Jingyun Zhang, Yating Zhu, Youyu Yan, Wei College of Chemistry and Chemical Engineering Xi'an University of Science and Technology Shaanxi Xi'an710054 China Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao tong University Shaanxi Xi'an710049 China Xi'an Hantang Analysis & Test Co. Ltd Shaanxi Xi'an710201 China

Safety concerns have consistently presented substantial obstacles to the widespread adoption of lithium-sulfur (Li-S) batteries. Conventional polyolefin separators, which are characterized by low flash points and insufficient mechanical strength, pose potential safety hazards, including risks of fire and explosion under extreme operating conditions. In this study, we introduce a thermally stable and non-flammable poly-m-phenyleneisophthalamide (PMIA)-based multifunctional separator (L-PMIA separator), which is enhanced with lithium aluminum germanium phosphate (Li1.5Al0.5Ge1.5(PO4)3 or LAGP) fillers. By incorporating g high-ionic-conductivity LAGP and establishing an interconnected framework, this design effectively mitigates the issues of particle agglomeration and uneven commonly ion transport associated with traditional separators. The L-PMIA separator demonstrates remarkable mechanical strength (with a tensile strength of 8.5 MPa and a puncture force of 0.72 N) and thermal stability (showing no dimensional shrinkage even at 200 °C), while also facilitating the formation of continuous ion channels that inhibit lithium dendrite growth. Consequently, Li-S batteries utilizing the 4L-PMIA separator demonstrated a reversible capacity of 4.97 mAh cm−2 after 150 cycles, even under conditions of high sulfur loading (6.75 mg cm−2), limited electrolyte availability (E/S = 7), and elevated temperatures. This approach offers novel insights for the development of future energy storage systems characterized by enhanced safety and performance. © 2025 Elsevier B.V.

关键词： Lithium sulfur batteries

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Research on control strategies for rapid load decrease events in fluoride salt reactor-supercritical CO2 Brayton cycle systems

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Nuclear engineering and Design 2025年 439卷

作者： Shichang, Yun Xinyu, Li Dalin, Zhang Ping, Song Wenxi, Tian Suizheng, Qiu Guanghui, Su State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Marine Thermal Power Technology Wuhan Second Ship Design and Research Institute Wuhan China

This study delves into the control strategies for the Fluoride-salt-cooled High-temperature Reactor-Supercritical CO2 (SCO2) Brayton cycle power generation system under rapid grid load reduction scenarios. By developing a dynamic simulation model, the system's dynamic response characteristics under rapid load changes were analyzed, and a combined control strategy emphasizing safety, speed, and economic efficiency was proposed. The research first compared the dynamic response characteristics and steady-state performance of different bypass configurations under load rejection conditions. The computational results indicate that all three bypass control systems exhibit excellent load-following capabilities, effectively responding to a 50 % load step change within 10 s. However, significant differences were observed in their steady-state thermodynamic performance: the upper cycle bypass control achieves the highest steady-state efficiency (η = 29.92 %), followed by the turbine bypass control (η = 27.50 %), with the heat source bypass control showing relatively lower efficiency (η = 26.49 %). Although the upper cycle bypass offers superior efficiency, it leads to a substantial increase in the working fluid flow through the compressor (ΔQ = 15 %) during operation, raising the risk of compressor blockage and necessitating additional flow restriction and anti-blocking interlock control systems. Considering system safety, control complexity, and engineering feasibility, the turbine bypass system, with its relative independence and lower operational risk, is deemed more suitable as the primary control strategy for load rejection conditions. Building on this, the study proposes a combined control strategy that leverages the strengths of both bypass control and inventory control. During the initial phase of rapid load reduction, the bypass control system quickly adjusts the turbine bypass valve opening to promptly respond to grid load changes, ensuring system frequency stability

关键词： Frequency stability

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Enhancing the Frequency Control Stability in Large-Scale VPPs with Limited Capacity of Fast-Response Units 19th

Enhancing the Frequency Control Stability in Large-Scale VPP...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Liang, Jun Tian, Zeyu Zhang, Penghua Zhang, Mingyue Li, Wei Liu, Huan Chong, Daotong China Nuclear Power Operation Technology Co. Ltd. Hangzhou 311215 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China China Nuclear Power Operation Management Co. Ltd. Jiaxing 314300 China

ISBN: (纸本)9789819647996

As renewable energy penetration increases, Virtual power Plants (VPPs) must not only manage energy scheduling but also ensure system security, particularly in response to frequency fluctuations. Existing research focuses on optimizing Primary Frequency Control (PFC) and developing specific control strategies for VPP units. In this study, a dynamic simulation model of a VPP was constructed, and two control systems—Energy Management System (EMS) and Capacity Coordinated Frequency Control (CCFC)—were established and optimized for better control effectiveness. The results demonstrate that the EMS designed for rapid energy storage response is better than traditional methods in responding frequency disturbances caused by rapid power demand changes. Under EMS control, the frequency nadir improved by 17.5%, and the time to reach steady-state was reduced by 77.2% during rapid power increases. Similarly, the nadir improved by 17.1%, and the steady-state time was reduced by 69.5% during power decreases. In addition, the coordinated optimization of EMS and CCFC enhances the VPP’s ability to manage large-scale power fluctuations. The safe power step adaptation range is expanded from 5 MW to 25 MW when the BESS’s dispatchable power is limited. This study highlights the potential of integrated control strategies to significantly enhance the frequency regulation and overall stability of VPPs. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Energy Management System Frequency Fluctuations Primary Frequency Control Virtual power Plant

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Effect of surface roughness on corrosion behaviour of stainless steel in supercritical CO 2

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Journal of Materials Research and Technology 2025年 36卷 4946-4954页

作者： Liyong Cao Wenyan Zhang Chongjun Jiang Hui Wang Hong An Chao Ye Jiyun Ren Xiaole Huang Lei Deng China University of Xihua Chengdu 610039 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China China University of Petroleum-Beijing Beijing 102249 China PipeChina Gansu Branch Lanzhou 730070 China Zhengzhou Yutong Group Co. Ltd. Zhengzhou 450000 China

To study the effect of surface roughness on the corrosion behavior of austenitic steels in supercritical CO 2 , the corrosion experiments were conducted on 304 and 310S stainless steels at 550 °C and 15 MPa. The corroded samples were characterized using XRD and SEM-EDS. The results demonstrate that surface roughness significantly affects the morphology and structure of the oxide films formed on 310S stainless steel. Samples prepared with varying surface roughness (grounded using from 200# to 1000# metallographic abrasive papers) showed that rougher surfaces tend to develop denser oxide layers, whereas smoother surfaces exhibit relatively loose and porous oxide films. Despite these differences in oxide structure, the overall corrosion weight gain remained largely unaffected, indicating minimal oxide shedding from 310S steel. The oxidation product is mainly Cr 2 O 3 . For 304 stainless steel, surface roughness was found to influence the composition of surface oxides. Both 200# and 1000# samples formed loose, porous oxide films prone to spallation, with the primary constituents being Fe 3 O 4 , (Fe, Cr) 3 O 4 and Fe 2 O 3 . Because the content of (Fe, Cr) 3 O 4 and Fe 3 O 4 of the former is higher, more voids appear in the oxide film, leading to spallation within the first 100 h of exposure. The rougher surface showed a more pronounced loss of oxide. But for the 600# sample, the main component is Fe 2 O 3 . Carburization was observed to intensify with increasing surface roughness in both materials. Notably, the 200# sample of 310S stainless steel exhibited more severe carburization compared to the 1000# sample of 304 stainless steel.

关键词： Supercritical CO 2 Corrosion Austenitic stainless steels Surface roughness Oxidation

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Application and Optimization of Monte Carlo Method for Simulation of Light Propagation in Biological Tissue

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Zhongguo Jiguang/Chinese Journal of Lasers 2025年第9期52卷

作者： Zhang, Hao Liu, Yifeng Wu, Wenjuan Li, Dong Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China

Objective The Monte Carlo (MC) method has become a cornerstone for simulation of light propagation in biological tissues, particularly for applications in laser therapy and medical imaging. However, traditional voxel-based Monte Carlo (VMC) methods often exhibit significant errors when dealing with complex curved surfaces due to the inherent limitations of structured grid discretization. By contrast, tetrahedron-based Monte Carlo (TMC) methods, based on unstructured meshes, offer better adaptability to complex geometries but incur higher computational cost. This study aims to address the trade-off between computational efficiency and accuracy in light propagation simulations by proposing a novel correction method to improve the performance of VMC in handling curved interfaces with large refractive index differences. The objective is to enhance the accuracy of VMC while maintaining its computational efficiency, making it more viable for practical biomedical applications, such as laser treatment and optical diagnosis. Methods This study compares the performance of VMC and TMC in light propagation simulations under different refractive index conditions. We propose a coordinate transformation-based correction method to reduce the errors in VMC caused by the inaccurate handling of reflection and refraction at curved interfaces. The simulations were carried out on a multi-layer skin tissue model with varying refractive index conditions;the laser light was directed at blood vessels embedded within the dermis. The correction method involves transforming the photon direction vector in a way that accounts for the curvature of the interface, thereby improving the accuracy of light photon interactions at the tissue boundaries. Simulations were conducted using MATLAB, and the results were validated through experimental cases, such as diabetic retinopathy laser treatment. The computational setup included an Intel i7-9700K processor and an NVIDIA GTX 3080 graphics card (GPU). Resu

关键词： Laser surgery

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