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Instantaneous mixing characteristics of binary mixtures differing in density in a gas-solid fluidised bed

Particuology 2020年第6期18卷 63-71页

作者： Zhen Wan Youjun Lu Hao Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina

Characterisations of instantaneous mixing behaviours in fluidised beds with binary mixtures has many *** studied the instantaneous mixing characteristics of binary mixtures in a 2-D quasi gas-solid fluidised bed using a capacitance probe *** method enabled the quantitative assessment of instantaneous mixing behaviours,including mixing index,rate,and *** kinds of binary mixtures of similar size but different density were used for the transient and steady fluidisation experiments in a bubbling fluidised *** mixing curves of initially segregated binary mixtures were acquired,and the instantaneous characteristics for the entire process were *** equation was proposed to describe the mixing process and predict the mixing degree over *** comparing experiments with different working conditions,the effects of superficial gas velocity and density ratio on the mixing in the centre and at the wall of the fluidised bed were *** the stable fluidisation stage,the axial concentration profiles of the mixtures were obtained,and the mechanisms of mixing were *** showed that the mixing level increased logarithmically with time and eventually reached a relatively stable *** the superficial gas velocity and reducing the density ratio promoted mixing and reduced mixing *** superficial gas velocities tended to mix the mixtures well and quickly,regardless of the density ratio of the two components.

关键词： Binary mixtures Fluidised bed Mixing Instantaneous characteristics

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Multiple load short-term forecasting model of integrated energy system based on multiple LSTM networks

Multiple load short-term forecasting model of integrated ene...

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International Conference on power engineering 2021, ICOPE 2021

作者： Cai, Yanchun Xu, Kaiwen Chong, Daotong Wang, Jinshi Yan, Junjie Liu, Ming State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Accurate short-term load forecasting of integrated energy system can optimize system operation and play an important role in improving system energy efficiency. In this paper, a multiple load short-term forecasting model of integrated energy system based on multiple LSTM networks is proposed. Firstly, the load influencing factors are divided into meteorological characteristic, delay characteristic and periodic characteristic, and the correlation is calculated based on Pearson coefficient. Secondly, a load forecasting model with multiple LSTM network coupling is established to explore the relationship between load and three characteristics, and excavate the complex coupling relationship among cooling, heating and power. The results show that the model has better prediction performance compared with other commonly used models. © 2021 The Japan Society of Mechanical Engineers.

关键词： Long short-term memory

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Thermal-hydraulic performance evaluation of annular fuel based on modified FROBA-ANNULAR

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 108-118页

作者： Li, Chenxi Liao, Haoyu Wu, Yingwei Tian, Wenxi Su, G.H. Qiu, Suizheng School of Nuclear Science and Technology Shanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this study, based on the modification of the pellet cladding mechanical interaction, gap closure process, and the cladding water corrosion model, Fuel Rod Behavior Analysis-ANNULAR (FROBA-ANNULAR) was uprated. The modified code was verified with FRAPCON-ANNULAR and ABAQUS. The verification calculation was under low power density when both two gaps were open. The calculation results showed good agreement. The modified code was then utilized to evaluate the annular fuel behavior, compared with the original code FROBA-ANNULAR. In this study, the annular fuel exhibits a much lower peak fuel temperature(about 900K). The different results for heat flux fraction(0.55 for the original code, 0.66 for the modified code) indicated that the gap closure process strongly affected the movement of the adiabatic pellet line. The internal pressure results (7.5 MPa for the original code, 6 MPa for the modified code) were also affected by the different assumptions. The results also showed that Zr's oxidation thickness and hydrogen concentration were related to both time and temperature. The higher the temperature was, the larger the oxidation rate was when the transition thickness was reached. © 2021

关键词： Heat flux

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Development of a three-dimensional method for thermal-hydraulics/neutronics coupling analysis and its application on CFETR helium-cooled solid breeder blanket

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 154-165页

作者： Lian, Qiang Tian, Wenxi Qiu, Suizheng Su, G.H. Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Blankets are of practical importance in the fusion reactor due to their main functions for engineering application. As the fusion power designed for the Chinese Fusion engineering Test Reactor (CFETR) is increased from 200 MW to 1.5 GW during its phase II operation, more challenges are issued for blankets from the points of view of thermal-hydraulics, neutronics, mechanics, and safety. In this paper, the Coupling Analysis of Thermal-hydraulics and Neutronics Interface Code (CATNIC) was developed using the user-defined function (UDF) in the CFD software FLUENT. The explicit coupling scheme based on cell-to-cell mapping approach was adopted to transfer data between neutronics calculation and thermal-hydraulics simulation. Three-dimensional thermal-hydraulic model and neutronics model were established using Fluent and MCNP4C, respectively. The helium-cooled solid breeder (HCSB) blanket of CFETR was simplified as a slice model to reduce the computing resources. With the slice model of CFETR HCSB blanket, the coupling analysis was carried out using the developed CATNIC. The calculation results from coupling and non-coupling analyses were compared to verify the feasibility of the coupling method in this study. As the helium coolant was considered as the transparent medium for neutron, the thermal-hydraulic and neutronics analyses were both converged after two iterations. However, using the developed coupling method in this study, the detailed change of tritium production ratio (TPR) and nuclear heat deposition in different parts of the blanket was revealed, which could provide important guidance for the design of the distribution for both coolant and purge gas. © 2021 Xi'an Jiaotong University

关键词： Coolants

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Dynamic performance analysis of different schemes of solar tower power plant

Dynamic performance analysis of different schemes of solar t...

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International Conference on power engineering 2021, ICOPE 2021

作者： Wang, Yaqian Chen, Weixiong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this paper, solar power tower stations with different configurations of steam generators are proposed, and a detailed dynamic model of one-dimensional distributed parameters is established and verified. The response characteristics of the two systems under the disturbance of the main controllable variables are calculated, and the results are analyzed and compared. It is concluded that, compared with steam turbines, steam generation systems have significant thermal inertia, and different steam generation system schemes will have a significant impact on the dynamic performance of the system. For a natural circulation-driven system, the energy balance and power output are more sensitive to the hot salt mass flow rate, and mass balance would be adjusted by the feedwater mass flow. For a once-through-driven system, the energy balance is controlled by hot salt mass flow, but the mass balance and power output should be adjusted by the feedwater mass flow. © 2021 The Japan Society of Mechanical Engineers.

关键词： Solar energy

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Analysis for fuel rod performance under LOCA based on the FROBA-ROD 2.0 code

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International Journal of Advanced Nuclear Reactor Design and Technology 2021年 3卷 54-65页

作者： Liao, Haoyu Li, Chenxi He, Yanan Wu, Yingwei Zhang, Yapei Tian, Wenxi Su, G.H. Qiu, Suizheng School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Loss of Coolant Accident (LOCA) is one of the major design-basis accidents in LWRs. Fuel rod may fail due to the rupture of the cladding. By developing a LOCA simulation module, the steady-state fuel rod performance analysis code, FROBA-ROD, is now capable to predict fuel rod behaviors under a LOCA transient. The relevant models and the code was verified and validated by comparing with authoritative commercial codes and with the experimental measurements. Comprehensive calculations and analyses of fuel rod behaviors under different LOCA transients were performed by the new version of FROBA-ROD. Compared the failure conditions to the non-failure conditions through the simulation results, a cladding failure threshold equation was found for a better estimate of the integrity of high burnup fuel rods under LOCA transients. © 2021 Xi'an Jiaotong University

关键词： Loss of coolant accidents

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3D In2S3/C/Fe3C nanofibers for Z-scheme photocatalytic CO2 conversion to acetate

Materials Today Catalysis

引用

Materials Today Catalysis 2023年 3卷

作者： Liao, Chen Jing, Wenhao Wang, Feng Liu, Ya International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 China

Constructing a Z-scheme heterostructure is of great significance to achieve efficient photocatalytic CO2 conversion without sacrificial reagents. However, the fabrication of a well-suited Z-scheme remains a challenge. In this work, we constructed a Z-scheme system with a suitable band structure by in-situ hydrothermal growth of In2S3 nanosheets on electrospun Fe3C/Carbon fibers with 3D structure. The Z-scheme electron transport path is verified by the calculation of the energy band structure calculation and the method of photodeposition, indicating that In2S3 and Fe3C are reduction reaction sites and oxidation reaction sites respectively. Carbon fibers serve as both the skeleton of the 3D structure and the electron mediator from Fe3C to In2S3. Moreover, the DFT calculation demonstrates that the introduction of Fe3C can reduce the energy barrier of *CO and *COH coupling on In2S3, and weaken the bonding of In-S, thereby enhancing the product selectivity towards acetate. Owing to the efficient charge transfer of the Z-scheme system, the photocorrosion in In2S3 is also greatly reduced, showing a relatively stable chemical composition after several hours of reaction. Compared with In2S3 and Fe3C/C, In2S3-C/Fe3C composites showed a significantly increased acetate evolution rate of 11.33 μmol/h/g without any sacrificial reagents. This work provides important insights into the design and research of the photocatalyst system that combines a monolithic 3D structure and a Z-scheme charge flow for efficient CO2 conversion. © 2023 The Authors

关键词： Carbon fibers

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Changing Conditions and Thermodynamic Transient Characterization of Therminol VP-1 Oil-Water Heat Exchanger

Changing Conditions and Thermodynamic Transient Characteriza...

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power System and New Energy Technology Innovation Forum (NPSIF), Boao New power System International Forum -

作者： Shuai Dong An Zheng Peng Wang Chaoyang Wang HUANENG YIMIN COAL-POWER CO. LTD. Hulunbuir China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (数字)9798331504557

ISBN: (纸本)9798331504564

In this paper, the exergy efficiency of high-pressure heater feedwater in a coal-fired power generation thermal system heated with Therminol VP-1 as the thermal fluid is investigated, and the transient characteristics of the heat exchanger are analyzed after changes in heat transfer oil parameters. The results show that the exergy efficiency of Therminol VP-1 for heating feedwater tends to decrease as the unit load decreases. The exergy efficiency for heating high pressure heater feedwater was 80% to 90%, with a maximum of 90.3%. The time required to reach the new steady state after perturbation of the boundary parameters of the oil-water heat exchanger increased with the load rate, with a minimum of 200 s and a maximum of 500 s in the study range. the new steady state was reached more quickly with increasing load than with decreasing load.

关键词： Thermodynamics Technological innovation Oils Water heating power system stability Thermal analysis Steady-state Transient analysis Heat transfer Turbines

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Experimental Study on the Propagation Mechanism of Acetylene-Air Detonation Waves in a Unilaterally Intermittently Constrained Channel

SSRN

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SSRN 2024年

作者： Gai, Jingchun Qiu, Hua Xiong, Cha Zhao, Minghao He, Xinlu Yang, Zhan Feng, Zhiyuan Cehn, Xitao Huang, Zuohua School of Power and Energy Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

This study experimentally explores the propagation mechanisms of acetylene/air detonation waves within a channel intermittently constrained on one side, utilizing soot foil and high-speed schlieren photography to capture the cellular structure and shock-flame evolution. The experiments revealed that the detonation waves traverse the semi-enclosed channel with various discrete wall configurations on the side in four distinct propagation modes: (I) periodic detonation failure and re-initiation;(II) single extinction and re-initiation;(III) localized extinction and (IV) non-extinction. Mode I occurs exclusively when the open area ratio exceeds 0.85, while detonation tends to favour Mode II when the gaps between discrete walls exceed three times the cell size;otherwise, it tends towards Modes III and IV. The re-initiation mechanism of detonation involves curvature shocks inducing local explosions of reactive mixtures through multiple Mach reflections off the discrete walls. The self-sustained propagation mechanism of the detonation wave is maintained by the interaction of strong transverse shocks reflected from discrete walls with the inherent transverse waves within the detonation structure, sustaining the instability of the cellular detonation. © 2024, The Authors. All rights reserved.

关键词： Detonation

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Co-Optimization for Distributed Multi-Energy System Based on Multi-Objective Robust Stackelberg Game: Energy Management and Multi-Energy Pricing

SSRN

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SSRN 2024年

作者： Ren, Xiaoxiao Wang, Jinshi Yang, Sifan Zhao, Quanbin Jia, Yifan Ou, Kejie Hu, Guangtao Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Energy Engineering Yulin University Yulin719000 China

To achieve low-carbon operation of distributed multi-energy system (DMES) and enhance its activity in the energy market, this paper proposes a novel multi-objective Stackelberg game model. The DMES operator (DMEO) acts as the leader, guiding users' behavior through DMES optimal scheduling and multi-energy pricing. The optimization objectives include maximizing DMEO revenues, minimizing DMES primary energy consumption and carbon emissions. The users act as followers, adjusting energy demand based on upper-level energy pricing with the objective of maximizing consumption surplus. To achieve the low-carbon and flexible operation of DMES, carbon trading and demand response mechanisms are introduced. The upper-level model is solved using the non-dominated sorting genetic algorithm III (NSGA-III), while the lower-level model is solved by the Gurobi solver. Furthermore, a robust optimization model with adjustable robust measure is established to mitigate the impact of renewable energy uncertainty. Finally, the validity of the proposed model is verified by a data center in Qinghai. Compared with traditional Stackelberg game model, the proposed model reduces DMEO revenue by 0.63% but decreases carbon emissions by 1.64% and energy consumption by 1.59%. Under this optimization framework, the energy efficiency and exergy efficiency of DMES are 0.798 and 0.535, and the share of renewable energy is 34.6%. Besides, increasing renewable energy uncertainty leads to lower DMEO revenue, higher carbon emissions and energy consumption, while significantly reducing energy efficiency and exergy efficiency. The proposed multi-objective Stackelberg game model may provide some references for multi-stage energy system optimization. © 2024, The Authors. All rights reserved.

关键词： Energy utilization

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