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Bed inventory balance and stability of dual circulating fluidized bed systems

Particuology 2024年第1期84卷 98-106页

作者： Yangjun Wei Leming Cheng David Pallares Bo Leckner Institute for Thermal Power Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China Department of Space Earth and EnvironmentChalmers University of TechnologyS-41296GöteborgSweden

Experiments and modelling are conducted for general understanding on the imbalance phenomenon and for discussion on the strategies to improve the bed inventory balance and stability of a dual circulating fluidized bed(DCFB)*** experiments are carried out in a 15.5 m high pilot-scale DCFB cold test system.A fluid-dynamic DCFB model is developed based on a 1.5-dimensional semi-empirical model of an industrial CFB boiler,validated by experimental *** effects of control methods and operation conditions on the bed inventory balance and on the stability of the pilot-and large-scale DCFB systems are discussed.A"stable-unbalanced"state,where the system reaches a steady state,consisting of un-balanced bed inventories,is observed in both experiments and model *** maintain a balanced state and similar bed inventory in the DCFB systems with similar cross-sectional areas,it is recom-mended to keep similar total pressure drops or gas velocities in both reactors.

关键词： Bed inventory balance Stability Dual circulating fluidized bed(DCFB) Experiment Modelling

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Operando modeling and measurements:Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO_(2)capture in real conditions

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Frontiers in Energy 2023年第3期17卷 380-389页

作者： Tianyi CAI Mengshi WANG Xiaoping CHEN Ye WU Jiliang MA Wu ZHOU School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Thermal Control of Electronic Equipment and Advanced Combustion Laboratory of the Ministry of Industry and Information Technology School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Alkalicarbonate-based sorbents(ACSs),including Na_(2)CO_(3)-and K2CO_(3)-based sorbents,are promising for CO_(2)***,the complex sorbent components and operation conditions lead to the versatile kinetics of CO_(2)sorption on these *** paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions,facilitating the sorbent development,reactor design,and operation parameter *** reviewed the theoretical simulation achievements during the development of *** elucidated the findings obtained by utilizing density functional theory(DFT)calculations,ab initio molecular dynamics(AIMD)simulations,and classical molecular dynamics(CMD)simulations as *** hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas-solid mode to the gas-liquid mode,boosting the ***,it briefly introduced a machine learning(ML)approach as a promising method to aid sorbent ***,it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation *** proposed measurement system includes a micro fluidizedbed(MFB)reactor for kinetic analysis,a multi-camera sub-system for 3D particle movement tracking,and a combined Raman and IR sub-system for solid/gas components and temperature *** is believed that this system is useful to evaluate the real-time sorbent performance,validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO_(2)capture.

关键词： CO_(2)capture carbonation theoretical modeling operando techniques reaction visualization

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A Novel Approach for State of Health Estimation and Remaining Useful Life Prediction of Supercapacitors Using an Improved Honey Badger Algorithm Assisted Hybrid Neural Network

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Protection and Control of Modern Power Systems 2024年第6期9卷 1-18页

作者： Zhenxiao Yi Shi Wang Zhaoting Li Licheng Wang Kai Wang the School of Electrical Engineering Qingdao UniversityQingdao 266071Chinaand the State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300130China the Key Laboratory of Intelligent Information Processing Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190China the School of Engineering Brown UniversityProvidenceRhode Island 02912USA the School of Information Engineering Zhejiang University of TechnologyHangzhou 310014China the School of Electrical Engineering Qingdao UniversityQingdao 266071China

Supercapacitors(SCs)are widely recognized as excellent clean energy storage *** state of health(SOH)estimation and remaining useful life(RUL)prediction are essential for ensuring their safe and reliable *** paper introduces a novel method for SOH estimation and RUL prediction,based on a hybrid neural network optimized by an improved honey badger algorithm(HBA).The method combines the advantages of convolutional neural network(CNN)and bidirectional long-short-term memory(BiLSTM)neural *** HBA optimizes the hyperparameters of the hybrid neural *** CNN automatically extracts deep features from time series data and reduces dimensionality,which are then used as input for the ***,recurrent dropout is introduced in the recurrent layer to reduce overfitting and facilitate the learning *** approach not only improves the accuracy of estimates and forecasts but also significantly reduces data processing *** under different working conditions are used to validate the proposed *** results show that the proposed hybrid model effectively extracts features,enriches local details,and enhances global perception *** proposed hybrid model outperforms single models,reducing the root mean square error to below 1%,and offers higher prediction accuracy and robustness compared to other methods.

关键词： Supercapacitors state of health remaining useful life honey badger algorithm recurrent dropout.

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Interlinked water and sediment microplastics in the Laizhou Bay of China

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Journal of Oceanology and Limnology 2025年第2期43卷 446-458页

作者： Hong CHEN Fenghua JIANG Jingxi LI Wei CAO Di ZHANG Futao ZHANG Shiliang WANG Chengjun SUN College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Analytical Technology Development and Offshore Eco-Environment Conservation First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Qingdao National Laboratory of Marine Science and Technology Laboratory of Marine Drugs and Biological ProductsQingdao 266071China

To explore the relationship of microplastic pollution in different media in marine environment,microplastics in the surface seawater and sediments of Laizhou Bay,Bohai Sea,North China,were *** samples were collected using a pre-concentrator equipped with a 20-μm mesh size sieve,and sediment samples were collected by a box *** shape,color,size,and type of microplastics were obtained by a stereomicroscope and a Fourier transform infrared spectrometer(ATR-μ-FT-IR).Results show that the abundance of microplastics in the surface seawater of Laizhou Bay was 858.3±573.2 items/m~3,and that of microplastics in sediments was 151.0±77.4 items/kg dry weight(d.w.)The microplastics in seawater and sediments were mainly ***,the microplastics in seawater were mainly transparent,and those in sediments were transparent and *** highest proportion of microplastics in seawater was rayon(77.48%),followed by polyethylene terephthalate(PET,13.17%).The highest proportion of microplastics in sediments was rayon(73.66%),followed by PET(8.90%).The size of microplastics in 1000-2000μm accounted for the largest proportion of 28.54%in seawater,while that in 500-1000μm took 27.93%in *** in seawater and sediment showed medium-level *** seawater,microplastic abundance was higher in offshore and nearshore areas of *** sediment,microplastic abundance was higher in offshore and nearshore areas of *** results of the principal component analysis(PCA)indicated that microplastics in sediment exhibited greater stability compared to those in *** microplastics in seawater and sediment show a positive correlation in terms of shape and plastic type,while exhibiting a negative correlation in terms of ***,microplastics in sediments were smaller in size,and those in seawater and sediments had consistent size distribution characteristics in space.

关键词： microplastic Laizhou Bay sediment seawater correlation

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Enhanced degradation of florfenicol by microscale SiC/Fe:Dechlorination via hydrogenolysis

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Chinese Chemical Letters 2024年第7期35卷 218-221页

作者： Yun-Fei Zhang Chun-Hui Zhang Jian-Hui Xu Lei Li Dan Li Jin-Hong Fan Jiale Gao Xin Quan Qi Wu Yue Zou Yan-Ling Liu Dongguan University of Technology School of Environment and Civil EngineeringDongguan 523830China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Herein,the degradation of florfenicol(FLO)over zero-valent iron(ZVI)enhanced by SiC was systematically *** was found that 5 g/L of ZVI/SiC(1:3)at pH 3.0 could completely degrade 20 mg/L of FLO within 1 h,with a Kobsvalue of 0.0873 min^(-1),12.5 times greater than that of pure ZVI(0.0069 min^(-1)).Vibrating sample magnetometer(VSM)characterizations revealed that the use of SiC supporter reduces the magnetic intensity of ZVI,which mitigates iron particle agglomeration,increases Brunauer-Emmett-Teller(BET)surface area,and enhances FLO degradation ***,ZVI/SiC exhibits a much lower hydrogen evolution potential(HEP)and significantly higher corrosion currents compared to pure *** was proposed to undergo degradation via reductive dechlorination,involving a hydrogenolysis mechanism that entails the cleavage of theσ*** study provides new insights into the reduction hydrogenation mechanism of ZVI.

关键词： Zero-valent iron Silicon carbide Reductive dechlorination Hydrogenolysis Florfenicol

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Synthesis of Ce/BiFeO_(3)composites and activation of persulfate for pharmaceutical wastewater degradation

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Journal of Rare Earths 2025年第3期43卷 462-469,I0002页

作者： Yanting Zuo Shi Cheng Ziwen Guo Haolin Liu Huaicheng Zhang Ji Wu Ziwu Fan Wentao Li Aimin Li Key Laboratory of Taihu Basin Water Resources Management Ministry of Water ResourcesNanjing Hydraulic Research InstituteNanjing 210029China School of Urban Construction Changzhou UniversityChangzhou 213164China School of Resources and Environmental Engineering Jiangsu University of TechnologyChangzhou 213001China State Key Laboratory of Pollution Control and Resources Reuse School of the EnvironmentNanjing UniversityNanjing 210023China School of Environment and Safety Engineering Nanjing Polytechnic InstituteNanjing 210048China

Sulfamethoxazole(SMZ)is a prevalent and recalcitrant micropollutant in water,posing a significant threat to both aquatic organisms and human ***,investigating the removal of SMZ is of critical *** order to investigate the effect of rare earth metal doping on the performance of activated persulfate oxidative degradation of SMZ,BiFeO_(3)with different Ce doping amounts was successfully prepared by a hydrothermal ***,it was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),scanning transmission electro n microscopy(STEM)and Brunauer-Emmett-Teller(BET)*** performance of porous Ce/BiFeO_(3)in the catalytic activation of persulfate(PMS)for the degradation of SMZ in water was investigated using SMZ solution as a simulated *** impact of Ce doping rate,catalyst dosage,temperature variations,common anions,natural organic matter,and PMS concentration on SMZ removal was systematically *** characterization results show that the octahedral rhombic structure of Ce can be observed on the surface of this doped catalyst,and Ce doping does not change the crystalline shape of Ce/BiFeO_(3).The specific surface area of the doped catalyst increases,accompanied by an enlargement of pore size,thereby enhancing the catalyst's adsorption capacity and resistance to contamination by *** the optimal conditions of 25℃,SMZ concentration of 20 mg/L,0.8 g/L PMS and 0.3 g/L 0.05Ce/BiFeO_(3)catalyst,the removal rate of SMZ reaches approximately 95%within35 min of reaction *** after five cycles of reuse,the degradation rate of SMZ remains above 88%,demonstrating the catalyst's good stability and *** experiments show that SO_(4)^(·-),·OH,1O_(2)and O_(2)^(·-)are involved in the catalytic degradation process,with 1O_(2)playing a dominant role.

关键词： Ce/BiFeO_(3) Persulfate Sulfamethoxazole Sulfate radicals Rare earths

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The Approach of Equipment Degradation Processes Considering Self-Recovery Characteristics 14

The Approach of Equipment Degradation Processes Considering ...

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14th International Conference on reliability, Maintainability and Safety, ICRMS 2023

作者： Zhou, Weixuan Lv, Chuan Geng, Jie Jin, Yuxue Zhang, Miao Gao, Zhuoying School of Reliability and Systems Engineering Beihang University Beijing China State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China Key Laboratory of Reliability and Environmental Engineering Beihang University Beijing China

ISBN: (纸本)9798350329988

Recent research in the process of equipment state evolution emphasizes the comprehensive consideration of the event process. However, the process does not consider the self-recovery capability of equipment in detail. In view of this problem, a detailed explanation of the self-recovery characteristics is given. Subsequently, a self-recovery model for equipment is established. Furthermore, the degradation process considering self-recovery is established. Finally, a numerical analysis is carried out to give the degradation process curve with self-recovery characteristics. The result shows that the degradation process can reflect the state evolution process more comprehensively for the equipment with self-recovery capability. © 2023 IEEE.

关键词： Degradation process Gamma process Self-recovery Shock process

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Darcy to non-Darcy seepage transition in heterogeneous coarse-grained soil:Seepage characteristics and critical threshold prediction

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岩石力学与岩土工程学报（英文版） 2025年第4期17卷 2526-2538页

作者： Xin Zhang Yufeng Wei Guoxiang Tu Hao Yang Shixin Zhang Peng Liang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China

Seepage in coarse-grained soil exhibits distinct non-Darcy characteristics,and the transition from linear to nonlinear seepage significantly affects the hydraulic characteristics and geotechnical *** to the complexity of pore structure in heterogeneous coarse-grained soil,identifying the critical threshold for the transition from Darcy to non-Darcy seepage is *** paper introduces equivalent particle size(dep)and relative roughness(λt)as indirect indicators reflecting the pore char-acteristics,quantifying the complex pore structure of heterogeneous coarse-grained *** formulae for the derivation of Reynolds number and resistance coefficient for heterogeneous coarse-grained soil are *** conducting permeability tests on coarse-grained soils with different pore structures,the effect of particle composition heterogeneity on seepage characteristics was *** flow regime of heterogeneous coarse-grained soil is divided into laminar,transitional,and turbulent stages based on the relationship between Reynolds number and resistance *** energy loss patterns in each stage are closely related to pore *** setting the permeability ratio k*=0.95 as the critical threshold for the transition from Darcy to non-Darcy seepage,a method for calculating the critical Reynolds number(Recr)for heterogeneous coarse-grained soil is ***,we applied this method to other published laboratory data,analyzing the differences in the critical threshold for seepage transition between homogeneous and heterogeneous coarse-grained *** study aims to propose a more accurate and general criterion for the transition from Darcy to non-Darcy seepage in heterogeneous coarse-grained soil.

关键词： Coarse-grained soil Porous media Seepage characteristics Non-Darcy seepage Pore characteristics

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Enhanced nitrogen removal from low strength anaerobic membrane bioreactor(AnMBR)permeate using complete nitrification and partial denitrification-anammox processes

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Frontiers of environmental Science & engineering 2024年第12期18卷 153-166页

作者： Jingwei Fu Zhaoyang Hou Hexiang Zhao Qian Li Rong Chen Yu-You Li Key Laboratory of Environmental Engineering Shaanxi ProvinceXi’an University of Architecture and TechnologyXi’an 710055China Hualu Engineering&Technology Co. Ltd.Xi’an 710000China International Science&Technology Cooperation Center for Urban Alternative Water Resources Development Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Department of Civil and Environmental Engineering Graduate School of EngineeringTohoku UniversitySendai Miyagi 980-8579Japan

In this study,an anaerobic membrane bioreactor coupled with a complete nitrification and partial denitrification-anammox process(AnMBR-NF-PDA)was developed to efficiently remove both chemical oxygen demand(COD)and *** control of raw water ratios was utilized to adjust the ratio of COD/NO_(3)^(-)-N,resulting in maximum nitrogen removal efficiency of 90.14% at a ratio of ***,specific anammox activity(SAA)increased with the proportion of raw water,peaking at 17.83 mg-N/(g-VSS∙d)in stage Ⅱ before *** variation was attributed to the significant presence of filamentous bacteria,especially“Acinetobacter”(13.58%-31.59%),which facilitated nitrite generation,supporting the nitrous oxide hypothesis in partial denitrification processes and enabling cross-feeding with ***,the average particle size of granular sludge increased from 300 to 528μm under the influence of filamentous *** analysis revealed an upsurge in genes associated with partial denitrification(NarG and NapA)as the COD/NO_(3)-N ratio *** abundance of genes closely correlated with anammox(Hzs and Hdh)peaked during stage Ⅱ,indicating the beneficial role of filamentous bacteria in the stable conversion of nitrite in PDA *** study offers valuable insights into optimizing the synergistic metabolism and granulation processes involving filamentous bacteria and AnAOB,thereby laying the groundwork for the practical application of AnMBR coupled with anammox processes in wastewater treatment.

关键词： Anammox Anaerobic membrane bioreactor COD/NO_(3)^(-)-N Filamentous bacteria

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Synthesis ofδ-MnO_(2)via ozonation routine for low temperature formaldehyde removal

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Journal of environmental Sciences 2025年第1期147卷 642-651页

作者： Guijun Fan Yacong Guo Shaohua Chai Le Zhang Jian Guan Guojun Ma Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 361021China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Petrochemical Engineering&Environment Zhejiang Ocean UniversityZhoushan 316022China

Nowadays,it is still a challenge to prepared high efficiency and low cost formaldehyde(HCHO)removal catalysts in order to tackle the long-living indoor air ***,δ-MnO_(2)is successfully synthesized by a facile ozonation strategy,where Mn^(2+)is oxidized by ozone(O_(3))bubble in an alkaline *** presents one of the best catalytic properties with a low 100%conversion temperature of 85℃for 50 ppm of HCHO under a GHSV of 48,000 mL/(g·hr).As a comparison,more than 6 times far longer oxidation time is needed if O3 is replaced by O_(2).Characterizations show that ozonation process generates a different intermediate of tetragonalβ-HMnO_(2),which would favor the quick transformation into the final productδ-MnO_(2),as compared with the relatively more thermodynamically stable monoclinicγ-HMnO_(2)in the O_(2)***,HCHO is found to be decomposed into CO_(2)via formate,dioxymethylene and carbonate species as identified by room temperature insitu diffuse reflectance infrared fourier transform *** these results show great potency of this facile ozonation routine for the highly activeδ-MnO_(2)synthesis in order to remove the HCHO contamination.

关键词： δ-MnO_(2) Ozone oxidation HCHO oxidation In-situ DRIFTS

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