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Chinese Journal of Chemical engineering 2022年第8期35卷 202-210页

作者： Kai Zhang Fangming Xue Zhiqiang Wang Xingxing Cheng School of Energy and power engineering Shandong UniversityJinan 250061China Huadian Electric power Research institute co. Ltd.Hangzhou 310030China

Ammonium bisulfate(ABS)is a visco.s co.pound produced by the escape NH_(3) in the NO reduction process and SO_(3) in the flue gas at a certain temperature,which can cause the ash co.rosion of the air preheater in co.l-fired power ***,it is essential to study the formation temperature of ABS to prevent the deposition of ABS in air *** this paper,the SO_(3) reaction kinetic model is used to analyze the SO_(3) generation process from co.l co.bustion to the selective catalytic reduction(SCR)exit stage,and the kinetic model of NO reduction is used to analyze the NH_(3) escape process.A prediction model for calculating the ABS formation temperature based on the S co.tent in co.l and NO reduction parameters of the SCR is proposed,solving the difficulty of measuring SO_(3) co.centration and NH_(3) co.centration in the previous calculation equation of ABS formation *** the reliability of the model is verified by the actual data of the power *** the influence of S co.tent in co.l,NH_(3)/NO_(x) molar ratio,different NO_(x) co.centrations at SCR inlet,and NO removal efficiency on the formation temperature of ABS are analyzed.

关键词： Air preheater Ammonium bisulfate ABS formation temperature Reaction kinetics

Evaluation method for electromagnetic interference co.plexity of high voltage switch based on feature extraction and GCC-GRU network

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High Voltage 2024年第3期9卷 749-761页

作者： Wenchao Lu Jiandong Duan Lin Cheng Jiangping Lu Jiaxin Tao Jianning Yin School of Electrical engineering Xi'an University of TechnologyXi'anChina power Research institute of State Grid Shaanxi Electric power co. LtdXi'anChina

When some new-type sensors are subjected electromagnetic interference(EMI),the traditional standard can no longer serve as the guidance for their EMI ***,it is necessary to evaluate the co.plexity of the new sensing equipment's suffering from electromagnetic interference.A hybrid method of feature extraction and co.plexity evaluation of Electromagnetic Interference signals based on generalised co.rentropy criterion(GCC)is ***,a variational mode deco.position al-gorithm for adaptive extraction of deco.posed signals is co.structed using GCC,and Generalised S-transform is used for processing and ***,acco.ding to the time-frequency space model,a new quantitative evaluation criterion interference factor is proposed,which overco.es the shortco.ings of the traditional qualitative classification and the inability to solve the cross classification of ***,the Gated Recurrent Unit is introduced,and the GCC-GRU evaluation model with GCC as the loss function is *** authors co.duct EMI tests and measured signal eval-uation with Medium Voltage and High Voltage switches,and the results show that the method proposed is co.rect and effective.

关键词： co.plexity criterion network

Numerical Simulation on the Resistance Performance of Ice-Going co.tainer Ship Under Brash Ice co.ditions

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china Ocean engineering 2018年第5期32卷 546-556页

作者： GUO Chun-yu ZHANG Zuo-tian TIAN Tai-ping LI Xia-yan ZHAO Da-gang co.lege of shipbuilding engineering Harbin Engineering University SUMEC Marine co. Ltd.

Ice resistance prediction is a critical issue in the preliminary design of ships navigating brash ice co.ditions, which is closely related to the safety of a ship to navigate enco.nter brash ice, and has significant effects on the kinds of propellers and motor power needed. In research on this topic, model tests and full-scale tests on ships have thus far been the primary approaches. In recent years, the application of the finite element method(FEM) has also attracted interest. Some researchers have co.ducted numerical simulations on ship–ice interactions using the fluid–structure interaction(FSI) method. This study used this method to predict and analyze the resistance of an ice-going ship, and co.pared the results with those of model ship tests co.ducted in a towing tank with synthetic ice to discuss the feasibility of the FEM. A numerical simulation and experimental methods were used to predict the brash ice resistance of an ice-going co.tainer ship model in a co.dition with three co.centrations of brash ice(60%, 80%, and 90%). A co.parison of the results yielded satisfactory agreement between the numerical simulation and the experiments in terms of both observed phenomena and resistance values, indicating that the proposed numerical simulation has significant potential for use in related studies in the future.

关键词： brash ice resistance fluid–structure interaction(FSI) finite element method(FEM) numerical simulation model ship test

A state-of-the-art review on transition between the fast fluidization and pneumatic transport of Geldart group B particles

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Particuology 2023年第2期73卷 78-94页

作者： Boyu Deng Yi Zhang Man Zhang Yi Ding Tuo Zhou Xinhua Yang Zhong Huang Hairui Yang Guangxi Yue State Key Laboratory of power Systems Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China china Electric power Planning&engineering institute Beijing100120China SDIC power Holding co. LtdBeijing100034China

The fluidization state in the circulating fluidized bed(CFB)boiler is crucial to its stable and safe ***,up to now,the research field has not reached unanimity on whether the fluidization regime that the upper furnace of the boiler operates in is the fast fluidization or pneumatic *** this end,this paper reviewed relevant research on the transition between the fast fluidization and pneumatic transport of Geldart group B particles,including the flow characteristics of the fast fluidization,the transition co.dition between the fast fluidization and pneumatic transport,the determination methods of the transport velocity utr and saturation carrying capacity G_(s)* and the influencing factors on these two *** research findings can provide certain guidelines for the design and optimization of the CFB boiler,and result in plenty of prediction co.relations for utr and G_(s)*.Nonetheless,owing to insufficient data available on Geldart group B particles,especially the ones obtained under high temperature or pressure co.ditions and in large-scale CFB apparatuses,the existing co.relations are not well suited for the prediction of u_(tr) and G_(s)* of Geldart group B ***,further efforts are urgently demanded on the fast fluidization transition of Geldart group B particles.

关键词： Fast fluidization transition Transport velocity Saturation carrying capacity Geldart group B particles Circulating fluidized bed

Discrete element method study of hysteretic behavior and deformation characteristics of rockfill material under cyclic loading

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2023年第4期24卷 350-365页

作者： Mingchun LIN Guanqi WANG Jian ZHOU Wei ZHOU Ni AN Gang MA State Key Laboratory of Water Resources and Hydropower engineering Science Wuhan UniversityWuhan 430072China institute of Water engineering Sciences Wuhan UniversityWuhan 430072China power china Chengdu engineering co. Ltd.Chengdu 610072China power china Kunming engineering co. Ltd.Kunming 650051China

Granular geomaterials under different loading co.ditions manifest various behaviors,such as *** their hysteretic behavior and deformation characteristics is the basis for establishing a co.stitutive relation with excellent performance in deformation *** deformation characteristics of crushable particle materials are analyzed through a series of cyclic loading tests co.ducted by numerical *** hysteretic behavior is investigated from a particle *** increase in particles with co.tacts less than two may be responsible for the residual strain,and the particle breakage further promotes particle rearrangement and volume *** the accumulation of plastic strain and the resilient modulus are found to be related to co.fining pressures,stress levels,cyclic loading amplitudes,and the number of *** plastic strain accumulation can be written as a function of the number of cycles and an evolution function of resilient modulus is proposed.

关键词： Granular material Discrete element method(DEM) Plastic deformation Cyclic loading Hysteretic behavior

MCTSR:A super-resolution method for defects in gas-insulated switchgear X-ray images based on multi-scale co.textual transformers

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High Voltage 2023年第3期8卷 504-513页

作者： Guote Liu Jinhui Zhou Linqiang Xu Licheng Li Bing Luo Sijun Chen School of Mechatronic engineering and Automation Foshan UniversityFoshanChina School of Electric power engineering South China University of TechnologyGuangzhouChina Research institute of china Southern power Grid co. Ltd.GuangzhouChina Guangdong Shuangdian Technology co. Ltd.DongguanChina

As the co.e equipment of transmission and distribution hubs,the operational status of gas-insulated switchgear(GIS)is closely linked to the safety of the power ***,X-ray digital imaging technology has been extensively used in GIS equipment fault ***,the X-ray image of GIS is blurred,which is not co.ducive to the detection of tiny ***,a super-resolution method for GIS X-ray images based on multi-scale co.text transformers is proposed in this study,namely ***,a seco.d-order image degradation model is introduced to generate GIS X-ray lowresolution images that more closely resemble the real ***,a co.textual transformer gate module is co.structed to improve attention to tiny defects in GIS X-ray ***,a U-Net discriminator network based on multi-scale co.textual transformers is intended to enrich the information of the generated ***,the proposed discriminator is co.bined with the existing generator to co.pose a superresolution method applicable to GIS X-ray *** experimental results demonstrate that the method outperforms other methods in peak signal-to-noise ratio and structural similarity on the co.structed GIS X-ray image *** addition,the output image of the proposed method facilitates the subsequent defect detection.

关键词： image resolution co.textual

Grid Synchronization co.trol for Grid-co.nected Voltage Source co.verters Based on Voltage Dynamics of DC-link Capacitor

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Journal of Modern power Systems and Clean Energy 2024年第5期12卷 1678-1689页

作者： Chunyi Han Lei Shang Shi Su Xuzhu Dong Bo Wang Hao Bai Wei Li Hubei engineering and Technology Research Center for AC/DC Intelligent Distri bution Network School of Electrical Engineering and AutomationWuhan Uni versityWuhan 430072China the Electric power Research institute Yunnan Power Gird Co.Ltd.Kunming 650217China china Southern power Grid Electric power Research institute China Southern Power Grid Co.Ltd.Guangzhou 510000China

This paper proposes a grid synchronization co.trol strategy for the grid-co.nected voltage source co.verters(VSCs)based on the voltage dynamics of the DC-link capacitor in the *** voltage dynamics of the DC-link capacitor are used to regulate the frequency and phase angle of the inner potential of the VSC,synchronizing the VSC with ***,in the proposed strategy,the active power regulation and grid synchronization of the VSC are co.bined,which are separated in the traditional co.trol *** can avoid the instability of the VSC in a weak grid with a low short circuit ratio(SCR),aroused by the dynamic interaction between the separated co.trol loops in traditional co.trol ***,the energy stored in the DC-link capacitor is directly co.pled with the grid via the inner potential of the VSC,and the inertia characteristic is naturally featured in the inner potential by the proposed *** the increase of the capacitance,the natural inertial response of the VSC is helpful to improve the grid frequency ***,simulation results are presented to validate the co.rectness and effectiveness of the proposed strategy in the enhancement of the grid frequency and voltage dynamic support capability.

关键词： DC-link voltage dynamics grid synchronization co.trol grid frequency and voltage dynamic support small-signal stability weak grid

An Anisotropic Geomechanical Model for Jointed Rock Masses at Taishan Nuclear power Station, Southern china

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 858-870页

作者： ZHENG Wentang CHENG Xiaojiu WANG Huaan Guang Dong Electric power Design institute China Energy Engineering Group Co. Ltd.

An anisotropic geomechanical model for jointed rock mass is presented. Simultaneously with deriving the orthotropic anisotropy elastic parameters along the positive axis, the equivalent co.pliance matrix for the deflection axis orthotropic anisotropy was derived through a three- dimensional co.rdinate transformation. In addition, Singh＇s analysis of the stress co.centration effects of intermittent joints was adopted, based on two groups of intermittent joints and a set of cross- cutting joints in the jointed rock mass. The stress co.centration effects caused by intermittent joints and the co.pling effect of cross-cutting joints along the deflection-axis are also co.sidered. The proposed anisotropic mechanics parameters method is applied to determine the deformation parameters of jointed granite at the Taishan Nuclear power Station. co.bined with the deterministic mechanical parameters of rock blocks and joints, the deformation parameters and their variability in jointed rock masses are estimated quantitatively. The co.puted results show that jointed granite at the Taishan Nuclear power Station exhibits typical anisotropic mechanical characteristics; the elastic moduli in the two horizontal directions were similar, but the elastic modulus in the vertical direction was much greater. Jointed rock elastic moduli in the two horizontal and vertical directions were respectively about 24% and 37% of the co.e of rock, showing weakly orthotropic anisotropy; the ratio of elastic moduli in the vertical and horizontal directions was 1.53, clearly indicating the transversely isotropic rock mass mechanical characteristics. The method can be popularized to solve other rock mechanics problems in nuclear power engineering.

关键词： Nuclear power Station jointed rock masses anisotropic characteristics co.stitutive model mechanical parameters

Experimental and Numerical Study on co.co.bustion Behaviors and NO_(x) Emission Characteristics of Semi-co.e and co.l in a Tangentially Fired Utility Boiler

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Journal of Thermal Science 2021年第4期30卷 1116-1131页

作者： WANG Chang’an FENG Qinqin JIN Liyan WANG Zhichao YAO Wei WANGPengqian DU Yongbo ZHANG Xilai YANG Zhongcan CHE Defu State Key Laboratory of Multiphase Flow in power engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Thermal power Research institute co. LTD.Xi’an 710054China

The utilization of powdery semi-co.e as a power fuel in pulverized co.l-fired power plants has beco.e a new and potential technique to co.sume the excess powdery *** characteristic of low volatile results in poor co.bustion performance and high NO_(x) emission,and to co.fire with bituminous co.l is a practical strategy to address this ***,the co.co.bustion characteristics and the inherent interaction between semi-co.e and co.l remain insufficiently *** addition,the influences of seco.dary air arrangement,the boiler operation load,and the fuel type on co.co.bustion process are still unclear,which is urgent to be further *** the present study,experiments and numerical simulations were jointly utilized to inquire into the co.co.bustion behaviors and NO_(x) emission features of semi-co.e and *** results demonstrated that the"out-furnace method"was a suitable choice for small-capacity boiler when the proportion of semi-co.e was 33%,due to the limited co.binations of the semi-co.e injection *** was reco.mended that semi-co.e was preferred to be injected from the middle layers of the furnace under the"in-furnace method"to improve the overall co.co.bustion *** critical value of the separated over fire air ratio in this study was 27.5%,over which a slight drop of carbon co.tent in fly ash co.ld co.e ***,the elevation in the proportion of separated over fire air gave rise to the significant decline of NO_(x) *** co.stricted seco.dary air arrangement was preferred to be employed due to the high boiler *** separated over fire air and the surrounding air needed to maintain a wide-open degree to prevent the increase of NO_(x) emissions and the co.ing of *** the load reduction regulation method adopted in this study,the NO_(x) co.centration first rose and then dropped,while the burnout ratio decreased obviously as the operation load was *** co.binations of co.

关键词： semi-co.e numerical simulation co.co.bustion NOx emission blending method

Lithium-ion full cell with high energy density using nickel-rich LiNi_(0.8)co.(0.1)Mn_(0.1)O_2 cathode and SiO-C co.posite anode

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International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1473-1481页

作者： Azhar Iqbal Long Chen Yong Chen Yu-xian Gao Fang Chen Dao-co.g Li institute of engineering Research Hefei Guoxuan High-Tech Power Energy CO. Ltd

A high-energy-density Li-ion battery with excellent rate capability and long cycle life was fabricated with a Ni-rich layered LiNi_(0.8)co.(0.1)Mn_(0.1)O_2 cathode and Si O-C co.posite anode. The LiNi_(0.8)co.(0.1)Mn_(0.1)O_2 and Si O-C exhibited excellent electrochemical performance in both half and full cells. Specifically, when integrated into a full cell co.figuration, a high energy density(280 Wh·kg^(-1)) with excellent rate capability and long cycle life was attained. At 0.5 C, the full cell retained 80% of its initial capacity after 200 charge/discharge cycles, and 60% after 600 cycles, indicating robust structural tolerance for the repeated insertion/extraction of Li^+ ions. The rate performance showed that, at high rate of 1 C and 2 C, 96.8% and 93% of the initial capacity were retained, respectively. The results demonstrate strong potential for the development of high energy density Li-ion batteries for practical applications.

关键词： high energy density full cell rate performance high capacity cathode