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《華電技術》來稿要求

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2017-01-01 Application of Meyer wavelet in harmonic detection of power system

YANG Chao, TANG Ping, SUN Feng(Guodian Nanjing Automation Company Limited, Nanjing 210003, China)

Abstract:Some problems exists in the detection and analysis of harmonic signals when using current wavelet basis function and fast Fourier transform algorithm, such as spectrum aliasing, spectrum leakage, etc.,and it causes a large error of detected harmonic wave. For the problems, a new accurate detection and identificationmothodis proposed in this paper, which using the Meyerwavelet basis function to make wavelet decomposition on harmonic signals due to its characteristics of infinite conductivity, biorthogonality and no spectrum aliasing phenomenon. After that, a simulation experiment of harmonic signals using this method is conducted and its result is compared with that of db3 wavelet basis analysis, which verified the accuracy and effectiveness of this method.

power quality;harmonic detection; wavelet analysis; Meyer wavelet

2017-01-05 A new type intelligent gird system structure study

LIAO Huanyu, WU Shenghua(Nanjing SAC Metso Control System Company Limited, Nanjing 210032, China)

Abstract:Recent years, intelligent grid attracted broad attention. A base system structure to realize intelligent grid functions was indicated. Distributed self-state-estimating was adopted to estimate grid real-time working condition. Based on the structure, fault detection, load balance, minimizing grid loss, power supply reliability and other applications of intelligent grid were detailed discussed. This intelligent grid structure has broad application prospect, can be referred for intelligent grid construction.

Keywords:intelligent grid; system structure; state estimation; failure detection; load balance; grid loss

2017-01-10 A new type coal-fired power plant digitalization construction key technology analysis

BAI Delong1, NI Yongzhong2, SI Xingzhong1(1.Daihai Power Generation Company Limited, Ulanqab 013750, China; 2.North China Electric Power University, School of Energy, Power and Mechanical Engineering, Beijing 102206, China)

Abstract:To build digital substation is an effective method to increase the intelligent and automation degree of thermal power plant, and to reduce energy consumption. After analyzing current digital substation development, the problems, such as information isolated island, life-time control, intelligent device utilization and big data mining, were introduced. The core of new-type digital substation is to realize equipment life-time control, to build integrated information control platform, and then to realize thermal power plant energy saving, emission reduction and efficacy increasing.

Keywords:digital power plant; full life cycle; integration; big data

2017-01-14 Differential protection research of voltage regulating transformer of rectifier unit and its application

HU Bing, GUO Xiao, CHEN Shi, XING Wu, WANG Zhe(Nanjing SAC Automation Company Limited, Nanjing 211153, China)

Abstract:This paper analyzed the defects in current protection configuration of voltage regulating transformer of rectifier unit and the necessity of configuring differential protection, proposed solutions of differential protection, and focused on the fundamental principles of differential protection of voltage regulating transformer that based on gear tracking. For the possible exceptions of gear collection, several gear checking methods were proposed. When the gear checking failed, it would switch to high constant value differential protection mode, and which could ensure the reliability of differential protection.

Keywords:voltage regulating transformer; rectifier transformer; differential protection; gear

2017-01-18 Pre-cast secondary equipment compartment overall structure stiffness measurement method

WANG Tao, BAO Anqun, GU Mingfei(Nanjing State Power Automation Company Limited, Nanjing 211153, China)

Abstract:Pre-cast secondary equipment compartment requires strength, stiffness and other mechanism property in each process, such as manufacture, assembling, transport and erecting. To measure the mechanism property in the a limited environment, a new approach based on base deflection was indicated.

Keywords:pre-cast secondary equipment compartment; structure stiffness; base deflection; measurement method

2017-01-21 SCADA-data-based wind turbine generator post-technical-improvement evaluating method study

YANG Chao1, WANG Zhi2, YE Xiaoguang2, JIA Siyuan1, LIU Qingchao2(1.Huadian Fuxin Energy Company Limited Yunnan Branch, Kunming 650228, China; 2.Huadian Electrical Power Research Institute, Hangzhou 310030, China)

Abstract:Evaluating methods for wind turbine generator based on supervisory control and data acquisition (SCADA) was introduced. The analyzing method for comparing load capacity and operation performance was indicated. This will quantitively evaluates the benefits increase after technology improvement.

Keywords:wind turbine generator; SCADA data; technology improvement; post-evaluation; load capacity; evaluating method

2017-01-24 W boiler Y type heavy oil gun blockage cause analysis and treatment

ZHU Jiaying1, ZHAO Weigang2, GUO Sanhu2(1.China Datang Corporation Science and Technology Research Institute Central China Branch, Zhengzhou 450000, China; 2.Xi’an Thermal Power Research Institute Company Limited, Xi’an 710032, China)

Abstract:While W boiler Y type oil gun burning heavy oil, carbon deposition, coking, nozzle and oil pipe blockage usually happened. Based on the incident of continuous extinguishment, poor atomization and continuous decreased oil flow that happened during a newly built boiler commissioning, the blockage cause was analyzed. Treatment and improvement measurements was taken accordingly. After treatment, the oil gun blockage was significantly improved, and work fine during boiler start. The problem of oil gun cleaning was fundamentally solved. Oil gun long term and continuous operation was ensured.

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Keywords:W boiler; Y type oil gun; heavy oil; blockage; treatment

2017-01-27 FCB operation condition bypass control system improvement

WANG Meng, LAI Yanyun, WANG Ji(China Energy Engineering Group Zhejiang Thermal Power Construction Company Limited, Hangzhou 310016, China)

Abstract:This paper introduced Indonesia Cilacap 1×660 MW ultra-critical unit major equipment and bypass control system. Based on the requirement for bypass control system under fast cut back (FCB) operation condition, the bypass control system was improved. After improvement, the unit passed 100% load FCB test. Which can be referred by similar bypass control system design and improvement project.

Keywords:ultra-critical unit; FCB operation condition; bypass control system; control strategy; improvement

2017-01-31 Application of phased array technology on hydraulic power plant crescent-rib steel bifurcated pipe composite welds inspection

ZHANG Yu, ZHANG Bing(The Ministry of Water Source Center for Hydraulic Metal Structure Quality Inspection and Test, Zhengzhou 450000, China)

Abstract:To better control the quality inspection of hydraulic power plant crescent-rib steel bifurcated pipe composite welds, phased array technology was adopted for sector scanning. The scanning result is very close to dissection. Which proved that ultrasonic phased array inspection is fast, accurate. It also can accurately measure incomplete penetration depth, which is not capable of traditional ultrasonic inspection.

Keywords:crescent-rib steel bifurcated pipe; composite welds inspection; incomplete penetration; phased array technology

2017-01-34 Application analysis of thermal power plant primary air coal powder velocity and density measuring under serious wet coal condition

XIA Mudan1, LIANG Longfei2, LU Jianwang2(1.China Southern Power Grid Zhuhai Integrated Energy Company Limited, Zhuhai 519000, China; 2.Beijing ENLANDAR Advanced Instrumentation & Control Company Limited, Beijing 100085, China)

Abstract:Existing coal powder velocity and density measurement technologies for coal-fired power plant primary air was introduced and compared. After analysis, the new type online whole section non-contact electrostatic sensor can accurately measure primary air coal powder and density under serious wet coal condition.

Keywords:wet coal powder; electrostatic measurement; whole section non-contact type; coal powder velocity; coal powder density; accurate measurement

2017-01-38 Direct firing pulverizing system coal powder pipe blockage test and treatment

LI Youxin(China Datang Corporation Science and Technology Research Institute Central China Branch, Zhengzhou 450000, China)

Abstract:Blockage frequently happened on a power plant’s No.4 pulverizer. After times of examination and adjustment, this problem remained. By tests of powder pipe air speed, coal powder fineness and powder concentration, the cause of blockage was determined as partial powder aggregation. After adjusting pulverizer separator damper, blockage was eliminated.

Keywords:pulverizer; separator; blockage; vane

2017-01-40 600 MW ultra-critical steam driven water supply pump start-up method discussion

CHEN Shuke, XUE Senxian, REN Shaojun(Zhuhai Jinwan Power Generation Company Limited, Zhuhai 519050, China)

Abstract:At present, 600 MW ultra-critical unit usually adopted incorporated start-up method of both electricity and steam driven water supply pump. To solve the problem of high current and large energy consumption, the advantage and procedure of only applying steam driven water supply pump was introduced. After this change, power consumption was reduced. Time from synchronization to denitration system started was shorten by one and a half hour. Environmental protection competitiveness was remarkably enhanced.

Keywords:ultra-critical unit; steam driven water supply pump; electrical water supply pump; energy saving; environmental protection

2017-01-43 A new type water supply pump steam turbine adjusting valve site change tool and application

ZHAO Chao, ZHU Yan(1.Jiangsu kanshan Power Generation Company Limited, Xuzhou 221011, China; 2.Xi’an Technology Unversity, School of Optoelectronics Engineering, Xi’an 710000, China)

Abstract:This paper introduced a portable tool to change high temperature and high pressure valve seat. Based on this tool, a new type turning tool, including butter, vertical guide liner, sleeve, fixing flange, hand wheel, lock hoop and other parts, was designed. To adjust position and depth of turning tool per valve seat depth and valve seat hole inner dimension, turning tool will drilling and move vertically to turning on site. This tool requires less operational still, less change term and will increase work efficiency.

Keywords:valve technology; turning tool; adjusting valve seat; feed water pump turbine

2017-01-45 600 MW ultra-critical thermal power unit primary frequency modulation disqualification analysis and logic improvement

BAI Yi(Fujian Huadian Kemen Power Generation Company Limited, Fuzhou 350001, China)

Abstract:Took the incident of primary frequency modulation disqualification happened in Fujian Huadian Kemen Power Generation Company Limited unit 4, the principle of 600 MW ultra-critical thermal power unit primary frequency modulation was introduced. Combine with the practice, the plan for logic improvement was indicated.

Keywords:600 MW; ultra-critical; primary frequency modulation; logic improvement

2017-01-50 300 MW bleeder turbine collision and friction cause analysis

GE Ting, GAO Kuan, LI Yong, LIANG Zhuo(Datang Central-China Electric Power Test Research Institute, Zhengzhou

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450000，China)

Abstract:Collision and friction happened in the high-low pressure flow passage area along shaft while the first start-up of 300 MW bleeder turbine after retrofit. After analyzing collision and friction causes, based on the calculation of high-low pressure flow passage area running clearance of each two stages, the first collided and fricated part was indicated. Improvement suggestion was provided.

Keywords:collision and friction; expand; abrasion

2017-01-53 Cause analysis and improvement measures of the damage of a steam turbine turning gear

FANG Jianyong(Hangzhou Huadian Xiasha Thermal Power Company Limited, Hangzhou 310018, China)

Abstract:The operation procedure of a steam turbine turning gear and the incident of serious damage were indicated. By analyzing the start-up curve, problems of instrumentation and control logic were indicated. After repair welding and polish, and I&C logic improvement, the safety and stability of turning gear was ensured.

Keywords:steam turbine unit; turning gear; gear; instrumentation and control logic

2017-01-56 Application of dry-wet incorporated cooling system in direct air-cooled unit

WANG Xueping(Yantai Longyuan Power Technology Company Limited, Shanghai 200062, China)

Abstract:With more and more serious air-cooled condenser bundle deposition, unit operation backpressure is much higher than design value, and has to operate in lower load. Dry-wet incorporated cooling system is able to lower operation backpressure and increase load capacity in summer. The application of dry-wet incorporated cooling in a 2×600 MW direct-cooled unit was introduced and analyzed. The author indicated this technology has well economic efficiency and worth widespread.

Keywords:dry-wet incorporated cooling; peak cooling; reduce backpressure; direct air-cooling unit

2017-01-58 Power plant auxiliary control wiring error caused by the failure analysis

WANG Aiming(Huadian Hubei Jiangling Power Generation Company Limited，Jingzhou 434100, China)

Abstract:In the thermal power plant auxiliary system,380 V power supply circuit of control power generally use 380 V/380 V isolation transformer to provide .The isolation transformer primary side connected to the motor control center (MCC) on the bus, isolation transformer secondary side by isolating switch power supply for control circuit. Auxiliary system function in the same 2 motors are generally interlock with each other, different motor control circuit of isolation transformer secondary side wire on the terminals are close, if the isolation transformer primary side and secondary side connection is not consistent, will lead to different voltage difference between motor control power supply wire, when two wire mistake touch two motor trip at the same time.

Keywords:coal-fired power plants; auxiliary system; the control wiring; failure analysis

2017-01-61 Incident of field loss protection caused by line tripping analysis

CHEN Haojie(Zhejiang Huadian Wuxijiang Hydraulic Power Plant, Quzhou 324000, China)

Abstract:An incident of field loss protection caused by line tripping was introduced. By detailed analysis, the main caused was determined that improper configuration of excitation system. Protective measurements and technical support was provided accordingly for the generator operation safety.

Keywords:line tripping; generator; field loss protection; excitation system

2017-01-63 Direct-cooled unit low load economic efficiency analysis

ZHANG Yan(Shanxi Guohua Jinjie Power Company Limited, Yulin 719000, China)

Abstract:A power plant’s 600 MW sub-critical direct air-cooled unit jointed grid low load regulation, rang of 50% to 100% rated load. The coal consumption of this unit reaches to 360 g/(kW·h) in load operation. To find the causes, thermal performance test, equivalent enthalpy drop and other methods were adopted. The factors that affects economic efficiency in low load was quantitatively analyzed. Treatments to improve operation and economic efficiency was provided.

Keywords:air-cooled unit; low load; equivalent heat drop; economic efficiency

2017-01-68 2×670 MW thermal power station denitration system overall working conditions improvement analysis and application

GUAN Xiangfeng, JIAO Yulong, WU Xiaoming(Huadian Weifang Power Generation Company Limited, Weifang 261204, China)

Abstract:Governmental environment protection regulations are more and more strict in recent years. Ultra-low emission reconstruction became power plants’ key projects. To realize ultra-low emission, a power plant implemented denitration overall working conditions improvement reconstruction. By staged economizer improvement, the incident of outage of SCR system while low load operation was improved. After improvement, boiler efficiency was maintained. Denitration efficiency was increased. Unit nitrogen emission achieve standard. Denitration overall working conditions operates was realized.

Keywords:denitration overall working conditions; ultra-low emission; economizer staged improvement; SCR inlet temperature

2017-01-71 Gas engine triple co-generation system flue gas denitration analysis

CHEN Zhifeng(Huadian Distributed Power Engineering Company Limited, Beijing 100160, China)

Abstract:In virtue of high efficiency, less energy consumption and other technical features, gas engine became more and more popular for smaller capacity triple co-generation system. Due to

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combustion structure of gas engine, it is difficult to control oxynitride emission. At present, gas engine flue gas temperature doesn't fit to typical denitration catalyst. By reconstructing flue gas waste heat part, tripe co-generation system effectively cooperated with conventional catalyst. Oxynitride emission up to requirement.

Keywords:gas engine; oxynitride; catalyst; denitration; triple co-generation

2017-01-73 Coal-fired power plant stack emission colored smoke plume study

GUO Jingjuan(China Datang Corporation Science and Technology Research Institute Northwest Branch, Xi’an 710065, China)

Abstract:The mechanism of colored plume (mainly blue and yellow) emitted from coal-fired power plant stack was introduced. The effect of different operation condition and reconstruction process of coal-fired unit to colored plume was analyzed. Incorporated with existing technology and ultra-low emission reconstruction technology, the measurement to reduce colored plume was indicated.

Keywords:coal-fired power plant; colored smoke plume; pollution; aerogel

2017-01-75 Comprehensive utilization scheme of desulfurization waste water in coal-fired power plant

MAO Lingling1, YANG Qingshan2(1.Foshan Chancheng Environmental Monitoring Station, Foshan 528000, China; 2.Foshan Shunde Wusha Thermal Power Company Limited, Foshan 528000, China)

Abstract:With the increasing demands of China on environmental protection emissions and water resources conservation, the treatment and reuse of desulfurization waste water in coal-fired power plant are gradually becoming the hot spots of power industry. Through analyzing the characteristics of desulfurization waste water in coal-fired power plant, which is generated by limestone-gypsum wet flue gas desulphurization, and combining with the utilization situations of water resources of different industries, this paper proposes a comprehensive utilization scheme of desulfurization waste water, which is supplied to the manufacturing enterprise of eco-friendly bricks. The scheme could not only save water resources and realize the comprehensive utilization of desulfurization waste water in coal-fired power plant, but also decrease operating cost of enterprise and obtain good economic benefits.

Keywords:coal-fired power plant; desulfurization waste water; eco-friendly brick; comprehensive utilization

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