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Table of Content
25 April 2015, Volume 37 Issue 4
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Treatment measures of collapse and water gushing of water diversion tunnel of Mupo Hydropower Station
TANG Xianghua, GONG Rui
2015, 37(4): 1-3.
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Abstract:In excavation process of the water diversion tennel of Mupo Hydropower station, the collapse and water gushing were occurred. Aiming at this problem, based on analysis of the surrounding rock geology and the underground water features, some countermeasures, such as ahead ductule grouting, ahead anchor bolt support and steel sopport, were adopted. The excavation construction progress was improved effectively, and favorable economic benefit and social effect were obtained.
Analysis on vibration reasons of speed controller oil pipeline of unit No.3 in Huanglongtan Hydropower Station and treatment
DENG Chenghong
2015, 37(4): 4-4.
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Abstract:In Huanglongtan Hydropower Station, in the processes of startup, shutdown and load regulation of the unit No.3, the vibration of the speed controller oil pipeline was too large, which seriously threatened safe and stable operatin of the unit. According to analysis, some measures, such as to reinforce the speed controller oil pipeline and to readjust the route and time of the speed controller in startup and shutdown process, were adopted. The vibration of the oil pipeline was eliminated effectively.
Type selection and design of sevice gate of ice gate in Xiaoshankou Secondlevel Hydropower Station
YANG Lijuan1, ZHAO Zhongying2
2015, 37(4): 5-6.
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Abstract:Normal operation of the ice gate is an important safegard for diversiontype hydropower station located in cold region to operate safely in winter. The design schame of the ice gate of Xiaoshankou Secondlevel Hydropower Station was analyzed. The measures to ensure the ice gate to operate safely were given, which can be used as reference for similar projects.
Comparison and selection of technical economical schemes of main machine cooling system in a mine mouth power plant
WANG Shenglong1, WANG Jiangyi2, ZHANG Shufang2, NIU Yufa1, WANG Jun1, CHEN Yuqi3
2015, 37(4): 7-13.
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Abstract:Using national economic evaluation method, the internal revenue rates under differential investment of two cooling schames of a mine mouth power plant, which are reservoir composited cooling water supply (oncethrough cooling water supply and recirculating water cooling system) and cooling tower secondary circulation method, were compared. The comparison conclusion is that the scheme of reservoir composited cooling water supply is superior to the cooling tower secondary circulation method. The technical advancement and the economy of the scheme are as below. The water temperature of the reservoir, whch is locates in piedmont of high latitude area, is more lower. The back pressure of the steam turbine with final stage long blade is lower. The Rankine cycle efficiency of the unit is higher. The evaporation loss of the water resource is reduced as far as possible, so the water saving effect is excellent. The difficulty of the reservoir to melt ice in winter is solved, and the discharge is meets with the standard of thermal discharge of the reservoir. The scale of the project is larger, and the social effect is favourable. The coal mine, the thermal power generation, the hydropower generation and the reservoir were developed integratedly, which formed great intensive advantages and comprehensive development effects. The generating cost of the plant is lower. The reservoir composited cooling water supply scheme is an innovative application of the oncethrough water supply cooling system in arid region.
New scheme for improvement of reliability of emergency power supply system of 1000MW unit
LI Qingchang, WANG Jiazi
2015, 37(4): 14-15.
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Abstract:To provide power supply for oil pumps of the steam turbine and the feed pump turbine and other important loads under unit fault condition is the key task of the 400V emergency power supply system of power plant. The startup failure of the diesel generator set in the emergency power supply system will caused the 400V emergency power supply system to be not able to supply power under emergency condition, which may lead major accident and massive loss. Based on conventional design of the emergency power supply system for 1000MW unit given by design institute, a new scheme was proposed, which can improve the reliability of the 400V emergency power supply system effctively.
Optimal design of drainage system of coal yard and ash yard for power plant located in highrainfall port
JIANG Fangshuai, LI Nan
2015, 37(4): 16-18.
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Abstract:According to the local raining condition and the port position features of the Cambodia Sihanouk Power Plant, aiming at the problems existed in original drainage system of the coal yard and the ash yard, a new overflowtype drainage scheme was proposed. The analysis shows that the overflowtype drainage scheme can meet the drainage requirement. Meanwhile, the scheme can reduce the cost by about 3.34 million yuan.
Analysis on fault of loose connection of terminals in secondary circuit of current transformer
WANG Song1, WU Pengyue2, SUN Ganghu2, WANG Zhigao1, GAN Jianghua3
2015, 37(4): 19-21.
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Abstract:A false trip accident of generator differential protection, which was caused by poor contact of secondary circuit of current transformer, was described. Using the circuit model of current transformer, the mechanism of overvoltage fault caused by opencircuit of secondary winding of current transformer was analyzed. The opencircuit test of secondary circuit of current transformer was carried out in laboratory. The relationship between the overvoltage and the primary current was verified qualitatively. At last, several methods to check the poor contact of secondary circuit of current transformer were given.
Realization mechanism of I/O module redundancy of maxDNA distributed control system
WANG Danlin, WU Shenghua, MA Weidong
2015, 37(4): 22-24.
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Abstract:The redundant I/O module technology used in maxDNA distributed control system to improe the system reliability was introduced. Aiming at different applications, there are two modes for the I/O module redundant configuration of the maxDNA system, which are the redundant I/O module redundancy and the mixed redundancy. In the mixed redundancy configuration mode, there are two mixed I/O switching over modules YMODULE and IMODULE, which provide different ways to connect nonredundant I/O modules into I/O bus network. In actual application, according to actual needs, it is able to adopt flexible redundancy configuration for the maxDNA system to improve the system reliability.
GRC composite prefabricated cabin structure of secondary equipment and simulation analysis
GU Jinshu1, YUAN Difei1,YU Chunlin1,BAO Anqun1, SU Lin2, CHE Yong3, SHAN Qiang3
2015, 37(4): 25-27.
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Abstract:A novel secondary equipment cabin prefabricated by glassfiber reinforced concrete (GRC) composite material was introduced. The structural style and the features of the cabin were analyzed. Based on simulation analysis, the total calorific value was calculated, and a conclusion was obtained that the equipment cabin is suitable for various regions with extreme weather.
Analysis on fracture failure of EHV line clamp terminal
CHEN Jiaquan, LIU Fuying, SU Guangyao, HUANG Haixin, WU Genshen
2015, 37(4): 28-31.
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Abstract:In a substation, the line clamp terminal of the EHV transformer failed due to fracture. Mechanical property test, microstructure analysis, sample fracture analysis and finite element calculation for the clamp terminal were carried out. It was determined by the analysis results that there were defects in the clamp terminal material, which include the micro-pores, the casting shrinkage hole (or loose) and others. Meanwhile, the bolt pretightening force during the clamp terminal installation was too large. These caused the fracture failure of the clamp terminal. Some targeted improvement suggestions were given.
Analysis on selfdeveloped Excel data acquisition system used in LED screen
CHEN Hao, CHENG Liang
2015, 37(4): 32-35.
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Abstract:The LED synchronous display technology was introduced. A selfdeveloped data acquisitin was introduced, in which the Excel VBA is used to realize realtime communication with NT6000 DCS. The concrete realization process was analyzed. The technology was used in the LED screen of center centralized control room of the power plant. The diversified display was realized, and the system operates stably and reliably.
Causes analysis of large terminal temperature difference of 600MW subcritical generator
HUANG Taiming
2015, 37(4): 36-38.
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Abstract:In Huadian Baiyinhua Jinshan Power Company Limited, #1, #2 turbines′ high and low pressure heaters′ terminal temperature differences are sharply higher than the designed value, with a maximum deviation of 13.94℃. After analyzing parameters collected from 300 ,400 and 565MW, causes are concluded that both the heaters′ water level and the extraction steam temperature exceeded standard values; and measures are put forward.
Feasibility of application of heat pump technology in Fularji Thermal Power Plant
WANG Xiaohong
2015, 37(4): 39-40.
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Abstract:The general situation of the heat pump unit of the Kiamusze Thermal Power Plant was introduced. The influence of the heat pump technology on the operation of the Kiamusze Thermal Power Plant was expounded. The feasibility to apply the heat pump technology in Fularji Thermal Power Plant was analysis. The differences between the heat pump technology parameters and the actual situation of the Fularji Thermal Power Plant were explained. The improvement measures were proposed.
Analysis on fault of exciter rectifier of turbo generator and maintenance measures
CHU Dong
2015, 37(4): 41-42.
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Abstract:The grounding shortcircuit fault of the brushless exciter occurred due to coke powder pollution. Based on analysis of device structure, the parameters needing monitoring and adjusting during operation, such as temperature and insulation parameters, were proposed. Some measures, such as insulation maintenance and periodic dust removal, were adopted, and the brushless exciter operates normally.
Analysis on vibration of bearing bush No.7 of 1000MW generator set in a power plant
JI Yunsong
2015, 37(4): 43-44.
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Abstract:Taking the 1000MW generator set of a power plant as example, the monitoring data of vibration of each bearing during commissioning period were analyzed, and it was found that the vibration of the bearing bush No.7 exceeds standardpermitted value. According to investigations of startup process repeatedly, the reason of the vibration was found. The targeted measures were adopted, and the problem of vibration of bearing bush No.7 was solved.
Reformation of bypass system of thermal power plant and optimization of protection control
ZHUANG Xiangyang, ZHANG Qingfeng, ZHU Yong, WANG Youquan
2015, 37(4): 45-47.
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Abstract:After the bypass system of the 300MW condensing generator set of Hubei Huadian Xiangyang Power Generation Company Limited was reformed, it is needed to modify and perfect correlative logic. The hidden danger, which may occurs after the bypass system was rformed, was analyzed, and relevant control logic optimization measures were proposed. The unit bypass system had been reformed for a year, the system was tested by different conditions and operated reliably and stably.
Application of intelligent control system of heat supply network in centralized heat supply projects
CAO Peiqing
2015, 37(4): 48-51.
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Abstract:Aiming at the current situation of domestic heat supply management, a concept of intelligent heat supply management system was proposed. The structured design and realization method of the heat supply network intelligent management system of Huadian Energy Company Limited were introduced. The result in this paper provides a systematic management platform for safe, valable, intelligent and harmonious heat supply.
Analysis on application of feedwater oxygenation treatment for unit No.7 of Zouxian Power Plant
CUI Shaobo, SUN Wei, MA Wei
2015, 37(4): 52-54.
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Abstract:Taking the unit No.7 of Zhouxian Power Plant as example, the situation of feedwater treatment by all volatile treatment technology and oxygenation treatment technology was traced. Based on comparison of the water steam quality, the deposition on the water wall and the pressure losses of feedwater system, it was shown that the oxygenation treatment is more safe and economical operation mode for ultra supercritical oncethrough boiler unit.
Analysis on fault of rotor conducting bolt of 390H generator
GU Qing, YU Huafeng
2015, 37(4): 55-57.
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Abstract:After the 390H generators were put into operation at home, the fault probability of rotator conducting bolt was higher. Combining field evaluation and overhaul, the structure features of the collecting ring conducting bolt and the main lead conducting bolt of 390H generator were introduced. The fault reasons were analyzed, and some concrete maintenance suggestions were proposed.
Solution of high fault rate of movable blade adjusting mechanism of axial flow fan
RAO Hongjian
2015, 37(4): 58-58.
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Abstract:Taking the two 660MW coalfired units of Huadian Xinxiang Power Generation Company Limited as example, the reasons of higher fault rate of the movable blade adjusting mechanism of the forced draft fan and the primary air fan were analyzed. The concrete retrofit scheme was proposed and implemented, and favorable effect was obtained.
Analysis and improvement of primary frequency adjustment system in power plant
ZHANG Wei, MA Liang, DU Wei
2015, 37(4): 59-61.
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Abstract:Under the background that Henan provincial electric power scheduling center carries on examinations of primary frequency adjustment of unified scheduling generators, given the current low quality primary frequency adjustment rate for Huadian Luohe Power Company′s firststage 2×330MW generator, we conduct a indepth analysis of frequency adjustment system, and improve it from the aspects of hardware, software, control logics. Finally, we achieved a substantial increase in quality rate.
Analysis on reasons of slagging of 600MW front and backwalls opposed firing boiler and treatment
CHEN Fei
2015, 37(4): 62-63.
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Abstract:In the two front and backwalls opposed firing boilers of a power pant, serious slagging problem was occurred after unplanned overhaul. Aiming at this problem, the reasons of slagging were analyzed. Some measures, such as to cntrol the quality of as fired coal and to adjust the operation parameters and combustion mode, were adopted, and the slsgging phenmenon was obviously improved.
Study on numerical simulation of flow field uniformity in reactor of SCR system of thermal power plant
CAO Wei
2015, 37(4): 64-66.
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Abstract:Taking the reactor of SCR system of the unit in a thermal power plant as study object, using the Computational fluid dynamics (CFD) software, numerical simulation analyis of the flue gas flow field of the reactor was carrid out. The guiding device of the system was designed by oneself. The flue gas contents and vilocity field, the ammonia mass fraction distribution and the flue gas pressure drop of the system under the boiler maximum continuos rating condition were analyzed. The features of the structural arrangement of the reactor was evaluated. The research results can be used as reference for design and improvement of the guiding dvice and the ammonia injection grid of the SCR reactor.
Application of fluidized ash material level detector in pneumatic ash conveying system of electrostatic precipitator
GAO Baohua, LI Zhi
2015, 37(4): 67-71.
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Abstract:The application of fluidized ash material level detector in dense phase positive pressure ash conveying system of electrostatic precipitator was introduced. The working process of the electrostatic precipitator and the relation between variation of material level of ash hopper and the working condition of the precipitator were expounded. The importance to detect the material level of the ash hopper and the ash fluidization status were described. The fluidized ash material level detector was recommended for supervision of the ash hopper material level of electrostatic precipitator and the fluidization status. By the measure, the automatic control of ash hopper material level was realized, and the operation reliability and the ash conveying efficiency of the electrostatic precipitator were improved. At the same time, the supervision results provide theoretical foundation for operation analysis of air and gas system and coal pulverizing system of the boiler and the environmental emission reducing.
Study on grid simulator for testing high power photovoltaic inverter system
SUN Gongwei1, ZENG Zehu1, ZHANG Chunwang2, YU Zhifei3
2015, 37(4): 72-75.
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Abstract:In order to test low voltage ridethrough(LVRT) function of high power photovoltaic converter, designing work of high power grid simulator is in need. Based on TI Company′s floatingpoint DSC processor—TMS320F28335, researchers structured a dual threephase bridge inverter system, i.e. integrating controllable rectifier and converter system into of dual threephase bridge system, for the purpose of creating grid simulator. Sampling voltage and set voltage were performed on double dq decomposition, thus segregating positive and negative sequence voltage, to realize asymmetric voltage drop. Meanwhile, a 100Hz notch filter was adopted in the decomposition process.Connected with photovoltaic converter, a power loop was formed; the system completed LVRT performance test successfully with only a little power consumption.
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