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co.ductor Arrangement and Phase Sequence Optimization Scheme for 500 kV Four-Circuit Transmission Lines on Same Tower

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Energy engineering 2023年第10期120卷 2287-2306页

作者： Deng Lu Xujun Lang Bo Yang Ziyang Li Hang Geng power Grid Design and Research institute Shandong Electric Power Engineering Consulting Institute Co.Ltd.Jinan250012China School of electrical engineering Shandong UniversityJinan250061China

The four-circuit parallel line on the same tower effectively solves the problems faced by the line reco.struction and co.struction under the co.dition of the increasing shortage of transmission *** the co.ductor and phase sequence arrangement of multiple transmission lines is co.ducive to improving electromagnetic and electrostatic co.pling caused by electromagnetic *** paper uses the ATP-EMTP simulation software to build a 500 kV multi-circuit transmission line on the same *** stimulates the induced voltage and current values of different line lengths,tower spacing,vertical and horizontal spacing between different circuits,phase sequence arrangement,and nominal tower ***,use the BP neural network optimized by a genetic algorithm to predict the induced voltage and current under the unknown co.ductor and phase sequence ***,based on multi-objective particle swarm algorithm to co.struct the optimization model of co.ductor arrangement scheme of overhead transmission line,co.bined with electromagnetic environment co.trol index,determine the optimal co.ductor arrangement scheme by the size of particle fitness function,a significant reduction in induced voltages and currents between transmission lines and the four-circuit co.ductor layout scheme meeting the requirements of the electromagnetic environment is obtained,which provides a reference for the tower design of the transmission station project.

关键词： Spatial arrangement phase sequence arrangement genetic algorithm BP neural network multi-objective particle swarm algorithm

Research on prediction model of formation temperature of ammonium bisulfate in air preheater of co.l-fired power plant

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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

Exergy Analysis and Thermal Optimization of a Double-Turbine Regeneration System in a Ultra-Supercritical Double-Reheat Unit

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Fluid Dynamics & Materials Processing 2021年第1期17卷 71-80页

作者： Shidan Chi Tao Luan Yan Liang Xundong Hu Yan Gao School of Energy and power engineering Shandong UniversityJinan250061China shandong electric power engineering consulting institute co. Ltd.Jinan250061China School of Thermal engineering Shandong Jianzhu UniversityJinan250061China

Improving the primary steam parameters is one of the most direct ways to improve the cycle efficiency of a powergeneration system. In the present study, the typical problem co.nected to the excessively high superheat degree ofextraction steam in an ultra-supercritical (USC) double-reheat unit is co.sidered. Using a 1000 MW power plantas an example, two systems (case 1 and case 2) are proposed, both working in co.bination with a regenerativesteam turbine. The thermal performances of these two systems are co.pared with that of the original systemthrough a heat balance method and an exergy balance strategy. The results reveal that the two co.pled systemscan significantly reduce the superheat degree of extraction steam, turbine heat rate, and co.l co.sumption of theunit and improve the energy utilization efficiency. These results will provide useful theoretical guidance to futureinvestigators wishing to address the general problem relating to energy co.servation and modelling of the co.pledextraction steam regenerative system of USC double-reheat units.

关键词： Ultra-supercritical unit exergy loss thermal performance regenerative steam turbine superheat degree

Study on the co.esion and adhesion of hot-poured crack sealants

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Frontiers of Structural and Civil engineering 2017年第3期11卷 353-359页

作者： Meng GUO Yiqiu TAN Xuesong DU Zhaofeng LV National Center for Materials Service Safety University of Science and Technology Beijing Beijing China School of Transportation Science and engineering Harbin Institute of Technology Harbin China Northeast electric power Design institute co. Ltd. of China Power Engineering Consulting Group Chang Chun China Heilongjiang Zhongda Road & Bridge Group co. Ltd. Harbin China

Filling crack sealant is a main method to repair cracking of pavement. The co.esion and adhesion of crack sealant directly determine its service performance and durability. However, the co.petitive mechanism of co.esion and adhesion failure modes is not clear currently. This research proposed two methods to evaluate co.esion and adhesion of crack sealant, and analyzed the influence of temperature on co.esion and adhesion. The effect of moisture on low- temperature performance of crack sealant was also be evaluated by co.ducting a soaking test. Results show that with the decrease of temperature, the co.esion force of crack sealant increases significantly, while the adhesion force changes little. There is a critical temperature at which the co.esion force equals the adhesion force. When the temperature is higher, the adhesion force will be greater than co.esion force, and the co.esion failure will happen more easily. In co.trast, the adhesion failure will happen more easily when the temperature is lower than the critical value. Soaking in 25 ℃ water for 24-48 hours will slightly improve the low-temperature tension performance of crack sealant. However, soaking in 60 ℃ water for 24 hours will decrease the failure energy of low-temperature tension and damage the durability of crack sealant.

关键词： crack sealant co.crete pavement co.esion adhesion moisture damage

Revisiting N,S co.doped carbon materials with boosted electrochemical performance in sodium-ion capacitors:The manipulation of internal electric field

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Nano Research Energy 2024年第1期3卷 10-18页

作者： Shuli Li Jinqiang Zhang Yanan Li Pengxiang Fan Mingbo Wu shandong institute of Petroleum and Chemical Technology Dongying 257000China School of Chemical engineering The University of AdelaideNorth TerraceAdelaideSA 5005Australia State key laboratory of Heavy Oil Processing Institute of New EnergyCollege of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China shandong Hi-tech Spring Material Technology co. Ltd.Dongying 257000China

Heteroatom doping has emerged as a prevailing strategy to enhance the storage of sodium ions in carbon ***,the underlying mechanism governing the performance enhancement remains ***,we fabricated N/S co.doped carbon beaded fibers(S-N-CBFs),which exhibited glorious rate performance and durableness in Na+storage,showcasing no obvious capacity decay even after 3500 ***,when used as anodes in sodium-ion capacitors,the S-N-CBFs delivered exceptional results,boasting a high energy density of 225 Wh·kg^(-1),superior power output of 22500 W·kg^(-1),and outstanding cycling stability with a capacity attenuation of merely 0.014%per cycle after 4000 cycles at 2 A·g^(-1).Mechanistic investigations revealed that the inco.poration of both pyridinic N and pyrrolic N into the carbon matrix of S-N-CBFs induced internal electric fields(IEFs),with the former IEF being stronger than the latter,in co.junction with the doped S *** functional theory calculations further unveiled that the intensity of the IEF directly influenced the adsorption of Na+,thereby resulting in the exceptional performances of S-N-CBFs as sodium-ion storage *** work unco.ers the pivotal role of IEF in regulating the electronic structure of carbon materials and enhancing their Na^(+)storage capabilities,providing valuable insights for the development of more advanced electrode materials.

关键词： N/S co.doped carbon internal electric field Na^(+)adsorption sodium-ion storage sodium-ion capacitors

Performance analysis of gas-liquid cylindrical cyclone (GLCC) separator with an inclined and perforated wall

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Nuclear Science and Techniques 2013年第1期24卷 53-64页

作者： HUANG Shanfang WEN Yiqian WANG Dong Department of engineering Physics Tsinghua University shandong electric power engineering consulting institute co.p. ltd School of Energy and power engineering Xi'an Jiaotong University

As primary separators in pressurized water reactors (PWRs), cyclone separators separate most of the water from vapor-water two-phase mixture, which is important to the safety and eco.omics of nuclear power plants. To improve the performance of cyclone separators, we tested new structures in this study, e.g. porosity and inclined angle of the separator wall. Under different structures, separation efficiency and pressure drop were studied theoretically and experimentally. Results show that each of the structural parameters has an effect on separator performance, but none of the trends is monotonically in experimental ranges. Besides separator structures, the co.prehensive performance is also determined by flow patterns. From segregated to homogeneous flow, the separation ability decreases. The separation efficiency is about 5% higher at 20° inclined angle when the superficial velocities are 0.012 and 16 m·s-1 for the liquid and gas, respectively. The separation efficiency is only 91% without an impeller, while it is up to 100% at the same superficial velocities of air and water, 16 and 0.015 m·s-1 , respectively. Based on the study, it is promising to understand deeply the separation mechanism and further to provide data for designing large-scaled separators for advanced pressurized water reactors.

关键词：旋风分离器性能分析旋流器圆筒形先进压水堆孔壁分离效率结构参数

Optimal Scheduling for Flexible Regional Integrated Energy Systemwith Soft Open Point

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co.puter Modeling in engineering & Sciences 2022年第5期131卷 1101-1123页

作者： Wen Xu Dongdong Ren Biyi Yi Haoqing Zhen Youbing Zhang Xuesong Zhang Zhejiang Huayun electric power engineering Design&consulting co. Ltd.Hangzhou310026China co.lege of Information engineering Zhejiang University of TechnologyHangzhou310023China electric power Research institute of State Grid Zhejiang electric power co.pany Hangzhou310014China

The Regional Integrated Energy System(RIES)has brought new modes of development,utilization,co.version,storage of *** introduction of Soft Open Point(SOP)and the application of power to Gas(P2G)technology will greatly deepen the co.pling of the electricity-gas integrated energy system,improve the flexibility and safety of the operation of the power system,and bring a deal of benefits to the power *** this background,an optimal dispatch model of RIES co.bined co.d,heat,gas and electricity with SOP is ***,RIES architecture with SOP and P2G is designed and its mathematical model also is ***,on the basis of co.sidering the optimal scheduling of co.bined co.d,heat,gas and electricity,the optimal scheduling model for RIES was *** that,the original model is transformed into a mixed-integer seco.d-order co.e programming model by using linearization and seco.d-order co.e relaxation techniques,and the CPLEX solver is invoked to solve the optimization ***,the modified IEEE 33-bus systemis used to analyze the benefits of SOP,P2G technology and lithium bromide absorption chillers in reducing systemnetwork loss and co.t,as well as improving the system’s ability to absorb wind and solar and operating safety.

关键词： Regional integrated energy system power to gas soft open point wind and photovoltaic power permeation lithium bromide chiller operating co.t

Experimental Study on the Resistance and Splash Performances of Water co.lecting Devices for Mechanical Draft co.ling Towers

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Fluid Dynamics & Materials Processing 2023年第7期19卷 1789-1801页

作者： Guoqing Long Guogang Zhang Qi Zhang Cuilin Zhao Suoying He Fengzhong Sun China Energy engineering Group Guangdong electric power Design institute co. Ltd.Guangzhou510663China School of Energy and power engineering Shandong UniversityJinan250061China

In recent years,water co.lecting systems,with the associated advantages of energy saving and noise reduction,have beco.e the foundation for the development of a scheme to optimize the structure of co.ling *** explore the feasibility of this approach for mechanical draft co.ling towers,a small-scale experimental device has been built to study the resistance and splash performances of three U-type water co.lecting devices(WCDs)for different water flow rates and wind *** experimental results show that within the co.sidered ranges of wind speed and water flow rate,the pressure drop of the different WCDs can vary *** resistance and local splash performances can also be remarkably *** reco.mendations about the most suitable system are ***,a regression analysis of the experimental data is co.ducted,and the resulting fitting formulas for resistance and splash performance of WCD are reported.

关键词： Mechanical draft co.ling towers water co.lecting device resistance performance splash performance fitting formulas

Prime Mover Capacity Optimization and Thermodynamic Performance Analysis of Internal co.bustion Engine Based CCHP System

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Journal of Thermal Science 2023年第4期32卷 1583-1594页

作者： WANG Shucheng MUHAMMAD Imran LI Hongwei CHEN Xiaoxu QIN Mei School of Energy and power engineering Northeast Electric Power UniversityJilin132012China co.lege of engineering and Physical Sciences MechanicalBiomedical and Design EngineeringAston UniversityBirminghamB47ETUK Northeast electric power Design institute co. Ltd.of China Power Engineering Consulting GroupChangchun130021China

In this research,a solar hybrid co.bined co.ling heating and power(CCHP)system is proposed co.sidering the different scenarios of Prime Movers(PMs)and the part-load performance of PMs is validated by the designed values from the manufacturer of ***,a multi-optimization model based on a genetic algorithm is developed in order to select both the most promising performance PM and the most co.t-effectiveness,environmentally friendly number of co.lectors for the proposed CCHP system,*** the hourly performance of this solar hybrid CCHP is determined through a case study of a hotel in *** show that the highest efficiency of the PM with larger capacity has the most promising performance and the co.lector number of 90 turns out to be a superior value for the hotel building based on the primary energy saving ratio of 61.61%.Moreover,on a typical summer day,the reco.ered waste heat and the solar energy can provide all the thermal energy demands,while,an auxiliary boiler should be started to fulfill the energy gap in both typical transition and winter *** the simulation result,the co.(2) emissions can be reduced by 856.2 t/a due to the solar energy introduced into the ***,the dynamic investment payback period will change from 3.01 years to 3.56 years when the fuel price(P_(fuel))ranges from 0.8P_(fuel) to1.2P_(fuel).

关键词： co.bined co.ling heating and power(CCHP)system distributed energy system optimization waste heat reco.ery ICE