2018-08-01ThefeasibilitystudyonGFSrainfallforecastforfloodforecastinginGutianBasin

YEZiguo1,LIChunhong2,WANGRui2,RUANHonghua1(1.Gutian River Hydroelectric Power Plant, Huadian Fuxin Energy Company Limited，Ningde 352258，China；2.Nari Grope Corporation, Nanjing 210003，China)

Abstract:Based on the actual information of rainstorm and flood in the Gutian River Basin in June 2017, the accuracy of global forecasting system(GFS) rainfall forecast was analyzed from the inspection of meteorological quality and relative error of forecasting during flood season. The flood forecast based on GFS rainfall forecast was carried out. The results show that the forecast accuracy and forecast period of flood are obviously improved combined with GFS rainfall forecast compared with that of uncombined GFS.

Keywords:GFS; flood forecast; forecast period; forecast accuracy

2018-08-05Monitoringanalysisandfeatureextractionofrollingbearfulllifedata

RUIXiaoming，HUXin(School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206，China)

Abstract:Based on the simplicity, convenience and powerful data processing function on vibration signal of the matlab language program, the time-domain analysis is performed on detected rolling bearing vibration signal. In the frequency domain and cepstrum analysis, an energy eigenvalue is used. The signal data is processed, and the trend curves of various eigenvalue parameters are obtained, so that the data of the rolling bearing can be more intuitively monitored and analyzed, and the life prediction can be performed.

Keywords:matlab; rolling bearing; eigenvalues; data monitoring analysis; life prediction

2018-11Researchandapplicationofefficientcoarsepowderseparator

SHIZhansheng1,SUNZhengrui2,DUANCuijia1,CAOWenguang1,LIZonghui1,MAZhian1,FANXiaoming2(1.China Huadian Corporation Science and Technology Institute, Beijing 100016, China; 2. Huadian Weifang Power Generation Company Limited, Weifang 261000, China)

Abstract:Coarse powder separator is an important device of a pulverizing system in a coal-fired power plant. The merits and drawbacks of the available radial and axial coarse powder separator are studied and analyzed. A new coarse powder separator is proposed. The new coarse powder separator makes the best of its effective space and introducesa centrifugal separating module creatively which eliminates bumping separation, enhances centrifugal separation, and solves the wear of inner cone and particles accumulation. The results of demonstration show that output of pulverizing system, separation efficiency and uniformity of pulverized coal are greatly increased, and the pressure drop of the separator, fineness of the pulverized coal, cycle ratio and power consumption of the primary fan are significantly reduced. Soft material blockage isalmost solved as well.

Keywords:coarse powder separator; centrifugal separation; radial; axial; performance index

2018-08-14Designandapplicationofroboticcoalsamplingsystem

WEIJiadong1,CUIXiuqiang2(1.Technology Research and Development Center,Jiangsu Yiweida Intelligent Technology Company Limited, Xuzhou 221116, China; 2.Technical Service Center, Huadian Power International Company Limited, Ji’nan 250014, China)

Abstract:With the rapid development of industrial robot technology in China,industrial robots have been widely used in many fields. In the fuel intelligentization of thermal power generation industry, the feasibility, design and precautions of industrial robot technology in coal automated sampling and analysis system are mainly discussed. A new intelligent sampling system which can realize sample preparation, sample packaging, code recognition and moisture detection by utilizing general industrial robot technology is proposed. The robotic sampling system can be applied to the coal intelligent sampling system, and can also be used alone in the coal sampling room, so that the preparation, detection and other processes of the coal sampling can be intelligent, unmanned, standardized and dust-free.

Keywords:coal combustion; industrial robot; sampling; automation; intelligentization

2018-08-18Discussionofthenewstructuralformcalled‘foresidewiringandforesidedisplay’

GUJinshu,YUChunlin,YUANDifei(Guodian Nanjing Automation Company Limited, Nanjing 211153, China)

Abstract:In order to meet the construction requirements of intelligent substation,considering the characteristic and using habit of secondary device in prefabricated cabin, it proposes a new structural form of secondary device called ‘foreside wiring and foreside display’. It makes secondary device’s installing, wiring and operating in front of panel realizable. Using this in cabin, the space of prefabricated cabin can be maximize, the floor space of intelligent substation can be reduced. In that case, this form could impel the miniaturization of intelligent substation.

Keywords:prefabricated cabin; intelligent substation; foreside wiring and foreside display；secondary device

2018-08-21Methodforimprovingmeasurementaccuracyofsoftgroundbackfillingproject

HUANGChengbin,ZHANGYulin(China Huadian Science and Technology Group Company Limited, Beijing 100160, China)

Abstract:There is a thick layer of silt and silty clay in the shallow subgrade of a coal-fired power plant in Vietnam. A large amount of sand-blowing backfilling work is required. According to the measurement method provided by the construction contract, there is disparity between the total amount of work measured the contractor and subcontractor. Through analysis, it is determined that the measurement method, measuring point arrangement and calculation method are the main factors affecting the measurement accuracy. The measures such as rationally arranging the ground subsidence observation symbol, improving the observation method, improving the measuring point arrangement and the standardizing calculation method are proposed. The accuracy of work amount measurement is effectively improved, the disputes on measurement are resolved, the interests of both parties are protected, and the project is smoothly implemented.

Keywords:soft ground; sand-blowing backfilling; measurement of work amount; accuracy

2018-08-23TheinfluenceandpreventionmeasurefortheintegrationofIDFandBFintheboilerfurnaceandfluegassystem

TANGGuorui,YOULiangzhou,LIZhuang(Huadian Electric Power Research Institute Company Limited，Hangzhou 310030，China)

Abstract:With the prevalence of ultra-low emission reformon flue gas, the integration of induced draft fan (IDF) and boost fan (BF) in the power plant is commonly applied in power stations. Based on the DL/T 5240—2010 Technical Code for Design and Calculation of Combustion System of Fossil-fried Power Plant, a safety assessment on the boiler furnace and flue gas system of a 330 MW unit was carried out. It was found that the possibility of internal explosion of boiler furnace and flue gas system caused by high-pressure large-flow IDF was increased. It is suggested that by optimizing the design and selection of the IDF, optimizing the resistance of the flue gas system and improving the pressure protection system of thermal control, the probability of internal explosion of boiler furnace and flue gas system could be reduced.

Keywords:integration of IDF and BF;the explosion-proof of boiler furnace;flue gas system;prevention measure

2018-08-26Causeanalysisontubeburstingsincehigh-temperatureoverheatingina300MWsubcriticalboiler

GAOQinglin1，GUOKaisheng2(1.Fujian Electric Vocational and Technical College，Quanzhou 362000，China； 2.Fujian Huadian Zhangping Thermal Power Generation Company Limited，Longyan 364400，China)

Abstract:Based on the macro-morphological analysis, chemical composition analysis, metallographic strcture analysis and mechanical property analysis, a tube bursting since high-temperature overheating in a 300 MW subcritical boiler of a power plant is analyzed. It turns out that the tube bursting is due to both long-term over temperature and short-term overheating (tube blocked by foreign matter).

Keywords:high temperature superheater; tube bursting; long-termover temperature; short-term overheating

2018-08-28Analysisofmeasurestoimprovetheeconomyof6FAcombinedcycleunitduringnight-timeshutdown

ZHOUYimin,WUMinjie(Hangzhou Huadian Xiasha Thermal Power Company Limited, Hangzhou 310018, China)

Abstract:In order to reduce the power consumption rate of the auxiliary machine during shutdown of the 6FA gas turbine combined cycle unit in night, and improve the economic performance of the gas turbine units’ running mode which is running by day and stop by night, the shutdown cooling water pump is used to replace the closed cooling water pump during the nightly shutdown. The measure reduced the operating costs of the unit. After the optimization, the nightly power consumption rate of auxiliary mechanical was reduced from the 35.0% to 22.8%, and the cost was reduced by 8 562 yuan per month.

Keywords:6FA gas turbine; combined cycle; running by day and stop by night; power consumption rate; economic performance

2018-08-31Groundpointprincipleandcaseanalysisofcurrenttransformer

DUXilai(Inner Mongolia Datang International Togtoh Power Generation Company Limited，Togtoh 010216，China)

Abstract:Measured circuits shunts caused by two-point grounding of the current transformer secondary winding, leaded to malfunction of main transformer differential protection. Aiming at the accident, analysis on possible current transformer false wiring was made at the scene. It expounds the importance and necessity that only one-point ground of current transformer secondary circuit is the allowed in the protection cabinet screen.

Keywords:current transformer；secondary circuit；ground；main transformer; differential protection; malfunction

2018-08-34Causeanalysisofhigh-leveldissolvedoxygenincondensatewaterofa660MWunit

SHANGZiwen(Huadian Xinxiang Power Generation Company Limited, Xinxiang 453635，China)

Abstract:In the daily operation of condensing units, high-level dissolved oxygen in condensate water will affect the economy and safety of the unit. In the addressing process onhigh-level dissolved oxygen in condensate water of a power plant, the vacuum tightness, supercooling degree, mechanical sealing of the condensate pump, valve sealing and other aspects are investigated one by one to detect the direct factors affecting this index. Some suggestions are provide as references in dealing with similar cases.

Keywords:660 MW unit; condensate water; dissolved oxygen; condensate pump; mechanical sealing

2018-08-36Discussiononoperationandmaintenancemanagementmodeofcentralizedcooling/heatingsysteminthermalpowerplant

WANGJie,WANGAiming(Hubei Huadian Jiangling Power Generation Company Limited, Jingzhou 434100, China)

Abstract:Most modern large-scale thermal power plants adopt centralized control mode for their operation management. Spot inspection combined with regular maintenance is commonly used in the equipment maintenance management. With the widespread application of energy-efficient centralized cooling/heating systems with water source heat pump in thermal power plants, there is contradiction between existing management method and the operation and maintenance management of complex equipment system. The overall outsourcing operation is put forward as the operation and maintenance method for HVAC system of the thermal power plant. The advantages and disadvantages of this management method are analyzed and the corresponding optimization strategies are proposed. Practice has proved that this management method can ensure the higher reliability and economy of the HVAC system operation.

Keywords:thermal power plant; centralized cooling/heating system; HVAC equipment; operation and maintenance; outsourcing

2018-08-39BriefanalysisofLGGHoperationandmaintenanceinthermalpowerplant

YUZhongyong(Wangting Power Plant, Suzhou 215155,China)

通過(guò)對(duì)以上例子以及前人研究成果的了解，形聲字的聲符示音能力不如形符表義能力強(qiáng)，一部分聲符和整字的聲韻調(diào)保持一致，另一部分與整字部分相同或相似，有示音的作用，并不能起到準(zhǔn)確標(biāo)音的作用。聲符的示音功能存在著兩種類型：①直接示音：聲符的讀音與整字完全一致；②類推示音：聲符與其構(gòu)成的形聲字的讀音都不一樣，但是這些形聲字的讀音卻一致。如，召——超、怊、弨、欩；留學(xué)生們可以通過(guò)其中一個(gè)字的讀音類推出其他具有相同形符的漢字讀音[4]。

Abstract:It introduces the application of low-temperature gas-gas heater (LGGH) in thermal power plants. In order to solve the existing defects such as leakage, corrosion and blockage, it is necessary to improve the monitoring, analysis and adjustment during operation. During overhaul period, it is necessary to optimize the flow guide plate at the entrance of the cooler, to clean, check, flush, troubleshoot , measure and evaluate the heat exchanger, so as to improve the safety and reliability of the low-temperature gas-gas heater.

Keywords:low-temperature gas-gas heater; cooler; heater; wear; corrosion; leakage; block

2018-08-42Causeanalysisandtreatmentonvibrationabnormalityofcogenerationsteamturbinegeneratorsets

WANGBolei,CAOWei,MOUFahai,ZEGang,GONGZhenquan(Hebei Ji-Yan Energy Science and Technology Research Institute Company Limited, Shijiazhuang 050051, China)

Abstract:A few days after the operation of a cogeneration steam turbine generator set in a power plant, there was abnormal generator vibration, which would reduce the operation load and affect the safety, stable operation and economic benefits of the units. Through the vibration diagnosis analysis, it was found that the vibration abnormality was caused by the misalignment of rotor and the inadequate contact area of the generator foot gasket. After re-aligning and replacing the gasket of appropriate size, the vibration of the generator set is abated, which would avoid furtherdeterioration of the problem and would effectively ensures the safe operation of the equipment.

Keywords:cogeneration; vibration diagnosis; spectrum analysis; adjustment gasket

2018-08-44ApplicationoffaultrecordinginDS6000system

Abstract:The function of DS6000 system and fault recording data is introduced. The realization process of ground fault analysis function in DS6000 system is expounded. Finally, the importance and function of fault recording data in DS6000 distribution automation system are illustrated by actual cases.

Keywords:DS6000 system; fault recording; feeder automation

2018-08-47CausesandcountermeasuresofMGGHleakage

ZHUXueping(Wangting Power Plant, Huadian Electric Power Development Company Limited, Suzhou 215155, China)

Abstract:After ultra-low emission modifications for power plants, chimney anticorrosion and ‘white smoke’ come out due to the cancellation of gas-gas heater (GGH).Most of the power plant will add a low-low temperature flue gas heat exchanger (MGGH).However, for reasons of design, installation and so on, there will be MGGH leakage during operation, which will cause ash accumulation and increase of resistance, short circuit of electrostatic precipitation, dry ash removal system blockage and so on. Serious leakage will even affect the discharge of smoke and dust. It analyzes the reasons for the leakage of MGGH, and formulating countermeasures which provide reference for the relevant problems.

Keywords:ultra-low emission; low-low temperature flue gas heat exchanger; gas-gas heater; chimney anticorrosion; leakage；countermeasure

2018-08-50Analysisandtreatmentonabnormalsoundfromsupportingbearingofquad-sectorairpreheater

CHENJianfei(Ningxia Guohua Ningdong Power Company Limited, Yinchuan 750000,China)

Abstract:It analyzes the causesof abnormal sound of the single-series quad-sector rotary air preheater during the installation and commissioning. By checking the bearings and the contact surfaces and reinforcing the supporting structure, major hidden dangers affecting the operation of the units can be eliminated. It provides reference for the installation and debugging of same type air preheater in new power plants.

Keywords:air preheater; supporting bearing; abnormal sound; deformation

2018-08-52Preventionmeasuresforpipeburstingofwaterwallof600MWultra-supercriticalboilers

XIAXuemin(Liaoning Huadian Tieling Power Generation Company Limited, Tieling 112000, China)

Abstract:There has been several bursting and leakage accidents occurred on water wall pipes of the 600 MW ultra-supercritical unit in Liaoning Huadian Tieling Power Generation Company Limited. Considering from the operation, methods such as the throttle orifice at the inlet of anti-flushing water wall, the improvement of steam water quality, alteration of sliding pressure operation curve and the improvement of daily operation (stop and start)of units and are proposed. Measures effectively prevent the water wall from bursting, greatly reduce the unplanned outages and significantly improve the economic benefits.

Keywords:ultra-supercritical boiler; water wall; pipe bursting; unplanned outage

2018-08-54Reasonanalysisandpreventionschemeoftubeblowinglossinlow-temperaturereheater

WUXiaoming,GUANXiangfeng,JIAOYulong,SUNZhengrui(Huadian Weifang Power Generation Company Limited, Weifang 261204，China)

Abstract:When Huadian Weifang Power Generation Company Limited took part in an anti-wear and explosion-proof inspection on a second-phase power plant boiler, it was found that the low-temperature reheater suffered a serious blowing. Inspection on the heating area was carried out to found out whether the narrow spacing between the soot blower and the tube rows, the installation defect of protecting tile were the key factors causing blowing loss on the heating surface. According to these factors, the optimized installation process of the upper protecting tile, the installation of the “L” shield at the lower part, and reduce the frequency of soot blows are recommended.

Keywords:heated surface; anti-wear and explosion-proof; blowing loss; material

2018-08-57BriefanalysisofmakingredundancyandupgradingofVPcardinDEHsystemof600MWunits

LIWenxiu(Anhui Huadian Suzhou Power Generation Company Limited, Suzhou 234101, China)

Abstract:In a digital electro-hydraulic control system(DEH) of a power plant’s#1 unit, there had been many faults on linear variable differential transformer(LVDT) and valve position (VP) jamming before the upgrading of LVDT and VP. It puts forward the scheme and practical procedure of a redundancy making and upgrading transformation. After the redundancy making and upgrading transformation, safety and stable operation coefficient of steam turbine is increased.

Keywords:digital electro-hydraulic control system; linear variable differential transformer; valve position jamming; redundancy

2018-08-59Causeanalysisandtreatmentofcondenservacuumsystemleakage

YUANJie,QIANWeiwu,SHIXiaowei,HANJingyi(Jiangsu Huadian Qishuyan Power Generation Company Limited, Changzhou 213000, China)

Abstract:A gas-steam combined cycle unit leaked during the normal operation of the condenser vacuum system. In-depth theoretical analysis was conducted on the cause of this phenomenon to confirm the effect of the condenser vacuum system leakage on the vacuum. Due to the variety of leakage detection methods commonly used at present, the selection of appropriate treatment solutions can solve the problem and provide a reference for other companies in addressing the condenser vacuum system leakage.

Keywords:condenser; vacuum system; leakage; leakage detection

2018-08-61Applicationandanalysisofnewcoalcontainedwastewatertreatmentsysteminthermalpowerplant

CAOXuesong,XUXiangnan,YANGBaosen(Dalian Power Plant of Huaneng Power International Company Limited, Dalian 116113, China)

Abstract:According to the reformation project of coal-contained wastewater treatment in Dalian Power Plant of Huaneng Power International Company Limited, a new coal-containing wastewater treatment system is compared with the old one. It expounds the deficiency of domestic coal wastewater treatment technology in actual operation. It also introduces the treatment principle, process flow, energy saving, emission reduction effect of the new treatment system and the technical advantages of the new system. At the same time, problems in the actual operation of the system are analyzed and solved by data access and field test. Reasonable suggestions are put forward to make further improvement on the efficiency and safety of the whole system. The continuous addition of flocculating agent is solved and the economic performance is improved.The proposed optimization scheme reduces security risks, improves treatment efficiency and improves treatment effect.

Keywords:coal-containing wastewater; electric flocculator; filter set; reverse washing technology; alarming device modification.

2018-08-66Technicalcomparisonandselectionforgenerationschemewithwasteheatofblastfurnacegas

ZHAOQicheng1，YUEDaiwei2,LIPeng1(1.China Power Construction Engineering Consulting Central Southern Company Limited，Wuhan 430040,China； 2.China Machinery Engineering Corporation, Beijing 100055, China)

Abstract:According to the status quo of blast furnace gas in a small iron enterprise, comparison of generation technique between gas turbine/combined cycle generation, internal combustion engine and gas boiler with steam turbine are made, and so are the analyses on corresponding advantages and disadvantages. A feasible technical scheme is proposed, which provides reference for small iron enterprise waste heat utilization,energy saving and pollutant emissions reduction.

Keywords:blast furnace gas; waste heat generation; gas boiler; gas turbine; combustion engine

2018-08-69Optimizationandreformoffluegascontinuousemissionmonitoringsystem

YANHuanhuan(Xuchang Project Department, Datang Environmental Industry Group Company Limited, Xuchang 461670, China)

Abstract:After the ultra-low emission reform on 2×660 MW units in a power plant, the power consumption for desulfurization of the#4 unit is 0.2～0.3 percentage point higher than that of the#3 unit. Through analysis, it is determined that the high power consumption for desulfurization of the #4 unit is caused by the uneven gas flow field in the clean gas pipe and the inaccurate measurement of the flue gas by continuous emission monitoring system (CEMS). According to the analysis results, the baffle is added, reasonable sampling position is reselected and sampling probe is prolonged. After the reform, the measurement accuracy of CEMS is obviously improved, which can meet the requirements of operational monitoring and environmental monitoring. Energy saving and consumption reduction is obvious.

Keywords:ultra-low emission reform; power consumption for desulfurization; flue gas continuous emission monitoring system; measurement accuracy; sampling probe; flow field

2018-08-72Applicationoffluegascondensationtechnologyinultra-lowemissionprojectofthermalpowerplants

WUChong,WANGZhengrong(China Huadian Science and Technology Group Company Limited, Beijing 100160, China)

Abstract:It introduces the basic principle of flue gas condensation technology in desulfurization tower and application of design parameters in ultra-low emission units. It analyzes the operation effects, and draws corresponding conclusions.

Keywords:flue gas condensation technology; desulfurization tower; ultra-low emission

2018-08-74EffectofWFGDdeviceonPAHsemissioncharacteristics

XINXiaoying,ZHUWentao,HUDa(China Huadian Electric Research Institute, Hangzhou 310030,China)

Abstract:Taking a 600 MW coal-fired unit limestone-gypsum wet flue gas desulfurization (WFGD) system as an example, the polycyclic aromatic hydrocarbons (PAHs) carried within flue gas and flue gas particulate at inlets and outlets were tested and compared. The alteration of PAHs concentration at inlets and outlets of WFGD system are analyzed. The test results show that PAHs concentration carried within flue gas is 1 126.7 ng/m3and more than 66.8% of it is distributed in flue gas particulate. The removal rate of WFGD system to PAHs is 60% and the removal rate to tetracyclic hydrocarbon and PAHs with five or more membered rings are 68.5% and 59.2% respectively, which is much higher than the removal rate to PAHs with 2 or 3 membered rings.

Keywords:coal-fired power plant; wet flue gas desulfurization; polycyclic aromatic hydrocarbons; removal rate; particulate