Table of Content

25 January 2017, Volume 39 Issue 1

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Application of Meyer wavelet in harmonic detection of power system

YANG Chao, TANG Ping, SUN Feng

2017, 39(1):  1-4. 

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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.

A new type intelligent gird system structure study

LIAO Huanyu, WU Shenghua

2017, 39(1):  5-9. 

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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.

A new type coal fired power plant digitalization construction key technology analysis

BAI Delong1, NI Yongzhong2, SI Xingzhong1

2017, 39(1):  10-13. 

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Differential protection research of voltage regulating transformer of rectifier unit and its application

HU Bing, GUO Xiao, CHEN Shi, XING Wu, WANG Zhe

2017, 39(1):  14-17. 

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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.

Pre cast secondary equipment compartment overall structure stiffness measurement method

WANG Tao, BAO Anqun, GU Mingfei

2017, 39(1):  18-20. 

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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.

SCADAdatabased wind turbine generator posttechnicalimprovement evaluating method study

YANG Chao1, WANG Zhi2, YE Xiaoguang2, JIA Siyuan1, LIU Qingchao2

2017, 39(1):  21-23. 

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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.

W boiler Y type heavy oil gun blockage cause analysis and treatment

ZHU Jiaying1, ZHAO Weigang2, GUO Sanhu2

2017, 39(1):  24-26. 

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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.

FCB operation condition bypass control system improvement

WANG Meng, LAI Yanyun, WANG Ji

2017, 39(1):  27-30. 

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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. 

Application of phased array technology on hydraulic power plant crescentrib steel bifurcated pipe composite welds inspection

ZHANG Yu, ZHANG Bing

2017, 39(1):  31-34. 

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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.

Application analysis of thermal power plant primary air coal powder velocity and density measuring under serious wet coal condition

XIA Mudan1, LIANG Longfei2, LU Jianwang2

2017, 39(1):  34-37. 

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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.

Direct firing pulverizing system coal powder pipe blockage test and treatment

LI Youxin

2017, 39(1):  38-39. 

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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.

600MW ultracritical steam driven water supply pump startup method discussion

CHEN Shuke, XUE Senxian, REN Shaojun

2017, 39(1):  40-42. 

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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. 

A new type water supply pump steam turbine adjusting valve site change tool and application

ZHAO Chao, ZHU Yan

2017, 39(1):  43-44. 

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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.

600MW ultracritical thermal power unit primary frequency modulation disqualification analysis and logic improvement

BAI Yi

2017, 39(1):  45-49. 

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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. 

300MW bleeder turbine collision and friction cause analysis

GE Ting, GAO Kuan, LI Yong, LIANG Zhuo

2017, 39(1):  50-52. 

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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. 

Cause analysis and improvement measures of the damage of a steam turbine turning gear

FANG Jianyong

2017, 39(1):  53-55. 

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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.

Application of dry wet incorporated cooling system in direct aircooled unit

WANG Xueping

2017, 39(1):  56-57. 

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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.

Power plant auxiliary control wiring error caused by the failure analysis

WANG Aiming

2017, 39(1):  58-60. 

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Incident of field loss protection caused by line tripping analysis

CHEN Haojie

2017, 39(1):  61-62. 

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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. 

Directcooled unit low load economic efficiency analysis

ZHANG Yan

2017, 39(1):  63-67. 

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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. 

2×670MW thermal power station denitration system overall working conditions improvement analysis and application

GUAN Xiangfeng, JIAO Yulong, WU Xiaoming

2017, 39(1):  68-70. 

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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.

Gas engine triple cogeneration system flue gas denitration analysis

CHEN Zhifeng

2017, 39(1):  71-72. 

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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 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.

Coalfired power plant stack emission colored smoke plume study

GUO Jingjuan

2017, 39(1):  73-74. 

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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.

Comprehensive utilization scheme of desulfurization waste water in coalfired power plant

MAO Lingling1, YANG Qingshan2

2017, 39(1):  75-76. 

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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. 