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Experimental study on combustion, ash fusibility and slagging propensity during co-combustion of organic solid waste and lignite

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Journal of the Energy Institute 2023年 106卷

作者： Liu, Hu Wang, Yancheng Xue, Jingwen Zhang, Yankang Yu, Pengfei Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Rapidly growth of organic solid waste (OSW) has caused serious social and environmental problems. Incineration as one of the most good public acceptance and environmentally friendly method attains increasing attention. In this study, the co-combustion characteristics of OSW and lignite, including the ignition and burnout temperature, ash melting and slagging propensity were studied. The experimental results show that the ignition temperature almost remains stable while the burnout temperature of the blends decreases as the increase of the OSW blending ratio, since the heat release during volatile combustion is beneficial for the burnout of coal char, but the polymer may melt and block the pores of the coal char at high temperature when the OSW blending ratio is higher than 30%. Besides, the slagging propensity of blending fuel is severe when the OSW blending ratio is 30%, and special attention should be paid to avoid slagging during the combustion process. © 2022 Energy Institute

关键词： Lignite

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Flocculation of suspended cohesive particles in Rayleigh-Bénard turbulence

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Physical Review Fluids 2025年第2期10卷 024305-024305页

作者： Han Huang Shuaiqi Zhao Rui Zhang Binbin Pei Kunpeng Zhao Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Key Laboratory of Mechanics on Disaster and Environment in Western China The Ministry of Education of China Lanzhou University Lanzhou 730000 China

We employ a four-way coupled numerical approach to investigate the dynamics of suspended cohesive particles in Rayleigh-Bénard turbulence. The Stokes drag, cohesive, and direct contact forces between primary particles are captured in detail, yielding the phenomena of flocs' aggregation, breakage, and deformation. The momentum and thermal exchange between primary particles and the fluid are considered based on the Source-in-Cell method. We found that the initial increase of the average floc size indicates a temporary flocculation phase, which is followed by an equilibrium phase where the average floc size becomes stable, reflecting the balance between aggregation and breakage. Different from the traditional perspective, which attributed the local accumulation of particles to their gravity, we found that the suspended particles still tend to accumulate in the bottom hot boundary layer region. This accumulation is primarily driven by the temperature-induced variation in aggregation strength and the nonuniform spatial distribution of floc inertia. Additionally, the stronger cohesion yields a reduction in momentum intensity of the thermal plumes, primarily due to the more pronounced weakening of fluid momentum by the larger flocs.

关键词： Momentum

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engineering of Fe d-band center in Fe_(3)O_(4)/CeO_(2)hetero-nanoparticles via orbital coupling for high-efficiency oxygen reduction electrocatalysis

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Nano Research 2025年第1期18卷 129-139页

作者： Jiayi Liu Jingwen Yin Yingzi Lin Mingxin Pang Huan Pang Songtao Zhang Lin Xu Jun Yang Yawen Tang Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023Chin a 2 State Key Laboratory of Multiphase Complex Systems Center of MesoscienceInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Testing Center Yangzhou UniversityYangzhou 225009China

The deliberate engineering of the d-band center of metal site represents an effective strategy to boost the intrinsic electrocatalytic performance toward the oxygen reduction reaction(ORR).Herein,following a heterointerfaceinduced orbital coupling rationale,we report a judicious design of an efficient ORR electrocatalyst consisting of Fe_(3)O_(4)/CeO_(2)hetero-nanoparticles in-situ encased into N-doped carbon nanofibers(abbreviated as Fe_(3)O_(4)/CeO_(2)@N-CNFs hereafter).The theoretic calculations uncover that the Fe_(3)O_(4)/CeO_(2)heterointerface-triggered orbital coupling can cause the down shift of the d-band center positions of Fe sites,which leads to the weakened chemisorption of oxygenated groups and lowered energy barrier for the potential-determining step,ultimately dramatically boosting the ORR intrinsic *** a consequence,the well-designed Fe_(3)O_(4)/CeO_(2)@N-CNFs display admirable ORR activity with a half-wave potential of 0.84 V and outstanding structural/electrochemical stability in an alkaline electrolyte,surpassing the commercial Pt/C benchmark and a majority of recently reported Fe_(3)O_(4)-based *** encouragingly,the Fe_(3)O_(4)/CeO_(2)@N-CNFsincorporated Zn-air battery outperforms the Pt/C-assembled counterpart with higher power density,larger energy density,and excellent cycling stability,serving as a competent candidate for ORR-involved renewable energy *** study offers an innovative approach for the rational manipulation of the d-band center and interfacial electron behavior of active sites toward the optimization of electrocatalytic performance.

关键词： hetero-nanoparticles electrospinning interfacial engineering orbital coupling oxygen reduction reaction

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Surface display of CadR protein on Rhodopseudomonas palustris CGA009 for enhanced heavy metal bioremediation

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Journal of Hazardous Materials 2025年 494卷 138592页

作者： Wang, Minmin Gao, Zixuan Jiang, Qiushi Mu, Xuefang Jiang, Youmin Li, Yanjing Zhang, Sihu Cao, Wen Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road Xi'an710049 China

Heavy metal pollution poses significant ecological and public health risks, and surface display engineering shows promise for bioremediation in this area. Although anoxygenic photosynthetic purple nonsulfur bacteria (PNSB) have been effectively applied to degrade pollutants due to their metabolic versatility, the use of surface display technology in PNSB remains very limited. In this study, we constructed a surface display system using Rhodopseudomonas palustris CGA009 as the host. The metal-binding protein CadR was fused with outer membrane protein A (OmpA) and expressed in CGA009. SDS-PAGE and immunofluorescence analysis identified the successful expression of the fusion protein on the cell surface. In addition, we used flow cytometry to explore the enhancement effects of linker peptides and different promoters on surface display efficiency under different light intensities. The surface display system enhanced the heavy metal resistance of the host bacteria, and the maximum removal rate of Cd2 + reached 95.6 %. By means of Langmuir isotherm analysis, the maximum biosorption capacity of the system for Cd2+ is 101.11 mg/g. The system demonstrates feasibility for application in complex real-world environmental samples. The presence of various metal ions does not interfere with the system's specific adsorption of Cd²⁺. It can stably maintain an adsorption efficiency of over 80 % under conditions of pH 6–8, temperatures of 20–35°C, and light intensity of 1000–6000 lux. Additionally, the system achieves a removal efficiency of 94.3 % in Cd wastewater. In summary, this study provides a reference for the development of photosynthetic bacterial surface display systems and provides an advanced bioremediation strategy for heavy metal contaminated wastewater. © 2025 Elsevier B.V.

关键词： Bioremediation

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Experimental study on the thermochemical reduction of supercritical CO2 by guaiacol

Experimental study on the thermochemical reduction of superc...

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International Multidisciplinary Conference on Computer and Energy Science (SpliTech)

作者： Yimeng Wei Jiadela Kuanibieke Hui Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

The continuous growth of CO 2 emissions is one of the global problems facing humanity, and how to convert and exploit the stock of CO 2 has become an urgent issue. Biomass as an activity of CO 2 thermal reduction medium has become the focus of human attention in general. Supercritical CO 2 (SCCO 2 ) has the advantages of near-liquid density and high solubility, which can further strengthen the reduction process (T≥31.26℃, P≥72.9 atm). This paper described a SCCO 2 reduction method of guaiacol on an intermittent Kettle Reactor to investigate the effects of reaction temperature (400-700℃), residence time (5-20 min) and reactant concentration (4 wt%-16wt%) on the three-phase products. The experimental results indicated that the carbon gasification efficiency (CE) and hydrogen gasification efficiency (HE) were 43.7% and 56.7%, respectively, when the carbon dioxide consumption reached 16.15 mol/kg. As the temperature increased, the consumption of carbon dioxide increased and the concentration of reactants increased with opposite results.

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Experimental Study on Stable Jet Impact Process Under Simulated Pipeline Rupture 21

Experimental Study on Stable Jet Impact Process Under Simula...

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21st IEEE Student Conference on Research and Development, SCOReD 2023

作者： Tao, Zhang Qincheng, Bi Jinle, Zhao Teng, Wang Jingrong, Chen Fan, Feng Xi'an Jiaotong University State Key Lab Multiphase Flow Power Engn Shaanxi Xi'an China North China Electric Power University School of Energy Power and Mechanical Engineering Bao'ding Hebei China

ISBN: (纸本)9798350318821

In this study, an advanced experimental system was utilized that incorporated heating, jetting, recycling, and cooling capabilities to ensure the successful execution of stable jet impact experiment that simulating a pipeline complete rupture. High-temperature resistant tempered glass was employed in the experimental system to realize the visibility. During the experiment, 8mm pipes/nozzles of varying lengths were employed as the test sections, and jetting phenomena when the import status is single-phase cold water or two-phase mixture at 0-2MPa were obtained by high-resolution photos. Additionally, the shape of the jet cone and the impact force exerted on the target plate were meticulously analyzed after the working fluid under different state parameters jetting into an atmospheric pressure environment through pipes/nozzles. The research also focused on the variation trend in the magnitude of the jet-impact force, as a function of inlet pressure and temperature, target plate distances, and length-to-diameter ratios. The research findings revealed that cold water(below 100°C), sub-cooled water(above 100°C but not reaching saturation temperature), and two-phase steam-water mixture exhibited distinct jet cone shapes during the jetting process, resulting in varying distributions of the jet force. Furthermore, the distance from the spout to the target plate and the length-to-diameter ratio significantly influenced the magnitude of the jet impact force. © 2023 IEEE.

关键词： Pipelines

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Thermal management performance and optimization of a hybrid system integrating liquid cooling and fin-enhanced phase change material for large-capacity energy storage battery pack

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Energy Conversion and Management 2025年 336卷

作者： Lin, Xiang-Wei Zhou, Zhi-Fu Liu, Maochang Chen, Bin Lu, You-Jun Jing, Deng-Wei Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Battery energy storage systems become increasingly important to address the intermittency of renewable energies, but their widespread adoption is still hindered by thermal concerns. However, a single thermal management strategy cannot ensure the overall performance of energy storage battery systems. In this study, a hybrid strategy combining topological fin structure, phase change material, and active liquid cooling is established for 280 Ah lithium-ion battery pack. A fluidic-thermal-phase change coupled model is built and verified experimentally. Meanwhile, a novel comprehensive evaluation parameter is defined to feature the overall performance of thermal management system. Based on this, comparative investigations are conducted to assess the efficiency of three cooling strategies. Despite additional weight caused by hybrid design, topological fin structure not only constructs the thermal conduction in phase change material but also dissipates the accumulated heat by connecting cold plate. Additionally, the impacts of fin fraction, thickness of phase change material, and inlet velocity are systematically explored using single-factor analysis. Furthermore, a surrogate-based model is utilized to reveal the interactions between design parameters and system performance, while accomplishing a global optimization. In contrast to original design, comprehensive evaluation parameter is reduced by 0.218, 0.273, 0.256, and 0.2 for discharge rates of 0.25, 0.5, 0.75, and 1C, respectively. © 2025 Elsevier Ltd

关键词： Battery storage

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Thermophysical property prediction of supercritical multiple mixtures fluid by molecular dynamics simulation

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Journal of Molecular Liquids 2025年 432卷

作者： Gui, Tete Li, Jiasunle Ge, Zhiwei Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Supercritical multiple mixtures (H2O/CO2) fluids are produced in the poly-generation system based on supercritical water gasification (SCWG). Understanding the thermophysical property of supercritical multiple mixtures fluid is rather essential to design and industrialize the poly-generation system. At present, the selection of force field models for H2O/CO2 mixtures are rather complicated, chaotic and inconsistent, the calculation of each parameter necessitates the use of one force field model. There is no universal force field model to calculate and conduct thermophysical property of H2O/CO2 at one time in a wide range of temperature within SCW. In this paper, heat capacity, viscosity and thermal conductivity of multiple mixtures in supercritical and near-critical water (575 K–1075 k) are first investigated via a novel common force field model with molecular dynamics (MD) simulations. The effects of different factors including the pressure, temperature and CO2 mass fraction on thermophysical properties of H2O/CO2 at a wide range of temperature were first analyzed and conducted in detail. The calculated results indicate that the phenomenon "critical point drift" for viscosity and thermal conductivity of H2O/CO2 mixtures migrating toward the low temperature region occurs. The drift values of viscosity and thermal conductivity are about 10 K and 28 K. The variation of heat capacity and viscosity of H2O/CO2 mixtures increases with increasing pressures only in low temperatures region (700 K-–800 K), while the thermal conductivity always increases with increasing pressures. When the mass fractions of CO2 increases from 20 % to 40 % and 60 %, the drift values for thermal conductivity and viscosity of H2O/CO2 mixtures decreases from 628 K to 624 K and 620 K, and from 627 K to 618 K and 610 K, respectively, and the peak heat capacity decreases from 64.9 J/mol·K to 52.4 J/mol·K and 45.1 J/mol·K. The fitting polynomial to determine conductivity, viscosity and heat capacity H

关键词： Temperature distribution

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Performance Analysis of Cooling Wall of Supercritical CO_(2) Coal-Fired Plants

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Journal of Thermal Science 2022年第6期31卷 1881-1890页

作者： WANG Yanjuan YU Binhui GAO Shuo LIU Qibin XU Jinliang The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power UniversityBeijing 102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Using supercritical CO_(2)(S-CO_(2)) instead of water steam as heat transfer fluid for coal-fired power plants is another way to further improve the power generation efficiency. In this paper, a multi-field coupling model that integrates fluid flow, heat transfer and thermal stress is proposed to solve the complex problem. The effects of the key operating parameters on the performances of the cooling wall are numerically investigated. More details of the characteristics of fluid dynamics, thermal stress, pressure drop, coupled heat transfer and the whole flow and temperature fields in the S-CO_(2) cooling wall are revealed and discussed. A comparison study is made between the cooling wall tube and waterwall tube. Both temperature and thermal deformations of cooling wall tube are much higher than that of water. Numerical simulation results indicate that inclination angle has little effects on the temperature distribution, while increase of pressure drop is obvious as the inclination angle increases. Increasing tube diameter can effectively reduce both the pressure drop and the temperature of the cooling wall tube. As a result, a new insight is introduced for the design of S-CO_(2) power cycle.

关键词： supercritical CO_(2) cooling wall coal-fired power plant heat transfer

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PROCESS MODELING AND ECONOMIC VIABILITY ANALYSIS OF A power-TO-H2-TO-power SYSTEM: CASE STUDY IN CHINA 37

PROCESS MODELING AND ECONOMIC VIABILITY ANALYSIS OF A POWER-...

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37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2024

作者： Li, Yanxin Dai, Yanbing Han, Xiaoqu Guo, Xuanhua Karellas, Sotirios Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Qingdao Huaru Energy Technology Company Limited Qingdao China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens 9 Heroon Polytechniou str. Zografou Greece

ISBN: (纸本)9798331307660

The power sector generates the most significant greenhouse gas emissions in many countries, while renewable energy penetration faces a bottleneck due to its ***, it is imperative to make substantial efforts to promote the penetration of renewable energy sources into the power *** process of hydrogen production with renewable energy sources is becoming increasingly economical as the cost of renewable energy sources, particularly onshore wind, has fallen *** the present work, a power-to-H2-to-power system (PHPS) combining onshore wind power was proposed as a solution for high penetration of renewable energy, which incorporates a large-scale alkaline water electrolyzer, and a gas turbine.A techno-economic study based on NOVO PRO© and GT PRO was carried out and applied to cases in Shaanxi, *** performance and operational characteristics of two types of PHPS with different hydrogen storage methods, PHPS/Tank and PHPS/Cavern, were *** is indicated that when 30% of the fuel of the gas turbine was replaced by hydrogen, the levelized cost of energy (LCOE) of the PHPS/Cavern was 0.0498 €/kWh with an internal rate of return (IRR) of 6.41%, therefore, PHPS/Cavern was economically feasible in ***, the renewable energy utilization and carbon reduction benefits of the PHPS were *** surplus electricity (curtailed electricity) and carbon emissions of the PHPS/Cavern can be decreased by 52% and 12%, respectively, compared to those of PHPS without hydrogen as the energy *** performance of PHPS with different hydrogen substitution ratios was *** analysis was further conducted to investigate the influence of key parameters on the system performance, including wind modules investment, electrolyzer investment, transport distance, and electricity ***, under the future scenarios in China in 2050, the LCOE of PHPS/Cavern can be reduced by 15% as well as the IRR increased by 66%.The result

关键词： Hydrogen storage

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