英文摘要

2018-07-01Optimizationofenergyconsumptionforecastmodelbasedonbigdataplatformandparallelrandomforest

XIAOXiangwu,WENWen,BAIQuansheng,HUWeidong,LIZhijin,LIUKeqing(Hunan Datang Xianyi Technology Company Limited, Changsha 410007, China)

Abstract:A healthy data set is acquired through data collection and preprocessing based on the construction of distributed big data analysis platform such as Hadoop, Spark and Hbase. Regression forecasting model of energy consumption based on the parallel random forest algorithm is built to comprehensively analyze and compare the relationship between input based on random forest prediction model, model parameters and output. The emphasis lies on comparative analysis of the decision tree number, depth of the decision tree and maximum number of split, which will affect the training model accuracy, running time and complexity. Optimization of the prediction model can achieve accurate prediction on the coal consumption for power supply and soft measurement calculation.

Keywords:big data analysis platform; random forest regression algorithm; Spark distributed computing; coal consumption; prediction

2018-07-05Researchonfaultdiagnosistechnologyofsupercriticalunitbasedondatafusion

NIXinyu1,MAODajun2(1.Jiangsu Wangting Power Plant of China Huadian Group Corporation, Suzhou 215155, China； 2.School of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China)

Abstract:Since the supercritical generating system has complex structure and high requirements on safety performance, fault diagnosis is very difficult. Combining fuzzy theory and DS evidential theory, a new fault diagnosis method is proposed, whose process includes membership function determination, fuzzy processing, neural network diagnosis, data fusion with DS evidence theory and obtaining the final result. Taking the fan of a supercritical generating system as an example, this method can be used for fault diagnosis, finding the equipment with higher fault probability quickly and accurately and providing countermeasure according to the fault in time.

Keywords:supercritical unit; fault diagnosis; fuzzy algorithm; DS evidential theory; data fusion

2018-07-10Researchandapplicationoncalculatingmethodofcoalquantityasfireforsupercriticalunitequippedwithdouble-inletanddouble-outletmill

XUWeiqiang,LIUXiang(Huadian Electric Power Research Institute Company Limited, Hangzhou 310030, China)

Abstract:The coal quantity as fire is an important parameter for units equipped with double-inlet and double-outlet mill. Accurate calculation of coal quantity as fire is related to the control and adjustment of the unit. Based on the analysis of the coal mill running mechanism and a large number of field tests, several factors affecting the coal quantity as fire are modified, and various working conditions are considered. A new method for calculating the coal quantity as fire is made, which can control the coal as fire accurately. It solves the great fluctuation of the generators’ parameters caused by large calculating deviation of coal as fire and improve the regulation performance of the unit.

Keywords:double-inlet and double-outlet mill; coal quantity as fire; calculating; relation parameter; modification; running state; application

2018-07-14Numericalsimulationstudiesofparabolictroughsolarthermalpowergenerationsystem

LIBo1,YUANYe2(1.China Electric Power Planning and Engineering Institute, Beijing 100120, China； 2.Northwest Electric Power Design Institute Company Limited, Xi’an 710075, China)

Abstract:In two regions suitable for the developing solar thermal power stations in western China, numerical simulation with system advisor model (SAM) software and Greenius software is made on a typical 50 MW parabolic trough solar thermal power plant. The calculation is carried out mainly on heat storage duration, gross power output per month, annual gross power out, annual utilization hours, photoelectric efficiency, etc. The numerical results indicates that the results of two softwares show similar results and the difference of the results may be caused by the heating field thermal output model and the steam turbine model.

Keywords:solar thermal power generation; system advisor model software; Greenius software; numerical simulation

2018-07-18Explorationandpracticeof660MWultra-supercriticalunitsoperatingin620℃reheatingsteam

HANRongli,FENGRenhai(Huadian International Shiliquan Power Plant , Zaozhuang 277103,China)

Abstract:After the operation of domestic 660 MW ultra-supercritical units, it is hard to achieve the designed reheating steam (turbine side) temperature which is 620 ℃. Analysis, optimization and improvement are made from unit design, engineering quality control and operation optimization, etc. After the commercial operation of units, the reheat steam temperature can be kept at the targeted 620 ℃ stably in long term. The success of the practice provides a reference for the same-type units in their construction and operation.

Keywords:660 MW units; ultra-supercritical unit; reheat steam; 620 ℃ technology; optimization

2018-07-22Studyandapplicationonflowfieldoptimizationoffluegassystematfanoutletinthermalpowerplant

LIDongmin1,ZHANGZhen2,PANGShaojian1(1.China Huadian Science and Technology Group Company Limited, Beijing 100160, China; 2.Guangdong Radiation Monitoring Center,Guangzhou 510300,China)

Abstract:In order to thoroughly solve the commonly existing problems in traditional rectangular design of flue gas system for induced draft fan outlet in thermal power plant, through the new circular double-tube eccentric confluence technology, a new type of circular flue and new design concept determine the optimized technical solution for flow field of flue gas system at fan outlet. The feasibility and superiority is verified in Huaneng Shantou Power Plant.

Keywords:thermal power plant; induced draft fan; countercurrent confluence; double eccentric confluence; flue; flue model; optimize the flow field

2018-07-25ApplicationandanalysisoftheleakagemonitoringsystemofYangliuqingthermoelectricboiler

ZHAONa(Tianjin Huaneng Yangliuqing Thermal Power Company Limited, Tianjin 300380, China)

Abstract:It introduces the working principle, system composition and system function of the leakage monitoring system of a boiler tube. The application results show that the leakage monitoring system of boiler tubes play an important role in the timely detection on the minor leakage point of the boiler and the long-term stable operation of the boiler.

Keywords:boilers; leakage point;leakage monitoring system of boiler tubes; acoustic sensors; alarm

2018-07-29Reformofboilerfurnacepressureprotectionsystem

MOBulin(Shaoguan Pingshi Power Plant Company Limited (B Factory), Shaoguan 512229，China)

Abstract:In order to solve the problem of blockage and leakage of the measurement pipeline during the operation of boiler furnace pressure protection system, two pressure transmitters were added on the original measurement equipment. One pressure transmitter and one pressure switch shares one sampling device. Signal of transmitter after election is taken as a protection signal. After modification, the blockage or leakage of the furnace pressure measurement pipeline can be monitored online. The furnace pressure measurement equipment can perform on-line without withdrawing from the furnace negative pressure protection. The pressure switches and pressure transmitters installed in groups can be mutually compared with each other, from which anomalies can be found. The application situation shows that the transformation can greatly reduce the maintenance working intensity of the furnace pressure measurement pipeline, reduce the risk of maloperation caused by maintenance work and make further improvement on the reliability of the furnace negative pressure protection.

Keywords:boiler; furnace negative pressure; protection system; transmitter; pressure switch; control logic; online maintenance

2018-07-32Causeanalysisandtreatmentonvibrationofmainsteampipeinapowerplant

WANGXiaofeng1,CHENRui2(1.Jiangsu Huadian Yangzhou Power Generation Company Limited, Yangzhou 225007, China; 2.Huadian Electric Power Research Institute Company Limited, Hangzhou 310030, China)

Abstract:Through the stress review, pipeline vibration measurement and analysis on the main steam pipeline in a power plant, the vibration characteristics of the main steam pipeline are obtained. According to the vibration measurement results, a treatment scheme which is installing a damper on the main steam pipeline of max vibration is proposed. It effectively eliminates the pipeline vibration and provides a solid guarantee for the safe and stable operation of the unit.

Keywords:main steam pipe; vibration; supporting hanger; damper

2018-07-35Inspectionandprocessingofexcessivegascontentintransformeroil

MAJinping(Liyuan Power Station of Yunnan Huadian Jinsha River Hydropower Development Company Limited, Lijiang 674100, China)

Abstract:At present, the excessive gas content in the transformer oil are mainly caused by air entry. In the process of excessive gas content in the transformer, scientific and appropriate inspection steps are taken to analysis the reason for excessive gas content accurately, to prevent the new air entry and air residue, and to prevent the equipment damage. It is important to reduce unnecessary operation in the process of processing. It summarizes the useful experience in the process of dealing with the excess gas content of 500 kV transformer in Liyuan Power Station, and gives a detailed description of the process and control measures for the inspecting and dealing with the gas content that exceeds the standard in the transformer, which can be used for reference to the treatment process for transformers of the same type.

Keywords:transformer oil；gas content；exceeding the standard；inspection; treatment

2018-07-38Applicationof66kVsolidelectricheatstoragedeviceinvigorouspeak-loadregulationofthermalpowerunits

SUNLiben,ZHANGShaocheng,XUBing,SONGHongfei,ZHENGLihui,WANBaige(Dandong Jinshan Thermal Power Company Limited, Dandong 118000, China)

Abstract:In recent years, new energy has developed continuously and rapidly in China. However, the proportion of coal-fired thermal power in Liaoning is high. The construction conditions for peak-load power supply are poor. It is difficult to adjust the peak during the heating period in winter, and the wind power abandonment is serious. Dandong Jinshan Thermal Power Company Limited built a new 260 MW solid electric heat storage device, which converts the abandoned wind power into heat energy and supplies it to the heat network. It can ensure peak-load regulation in the winter without reduce the heating output, which realizes the thermo-electric decoupling for thermal power units in winter and increase the utilization ratio of new energy sources.

Keywords:electric heat storage device; wind power abandonment; vigorous peak-load regulation; thermo-electric decoupling

2018-07-40Applicationofrotaryairflowclearingtechnologyinthecoalbunkerunblocking

ZHANGShaoxing(Huadian Weifang Power Generation Company Limited, Weifang 261204, China)

Abstract:2×670 MW coal-fired units adopted a direct-blowing pulverizing system. When the coal quality was poor, the coal bunker was frequently blocked. The original methods which were vibration method, air cannon method, and screw dredge method worked ineffectively. A helical pneumatic dredging device is used to reduce the blockage of the coal bunker dramatically and improve the operation reliability of the system. It also avoids the problem of load reduction caused by coal blockage.

Keywords:coal bunker; coal quality; blockage; rotary air flow; antiblockage

2018-07-43Selectionandanalysisonpipediameterandlayingmodeofthemainpipeinheat-supplynetwork

ZHENGZhen(Wuxi Public Utilities Industrial Group Company Limited, Wuxi 214000, China)

Abstract:Taking the heat-supply network project of a thermal power plant for example, on the basis of heat-load data analysis, the optimal diameter configuration scheme of the main pipe is selected according to the hydraulic calculation and heat loss estimation of the thermal pipeline. And through the comparison, technologic and economic analyze on 2 schemes which are laying overhead and laying underground, a suitable pipe laying mode is obtained.

Keywords:heat-supply network; heatload; pipe diameter; laying mode; economy

2018-07-45Reconstructionofemergencyshut-offvalvecontrolloopingasregulatorstationofgasturbinepowerplant

LIKun(Jiangsu Huadian Qishuyan Power Generation Company Limited, Changzhou 213011, China)

Abstract:When the gas-steam combined circle cogeneration unit of Jiangsu Huadian Qishuyan Power Generation Company Limited was conducting a dual power supply switching test on the regulator station control source, the emergency shutdown device (ESD) tripped during the switching process. The power supply to ESD was switched to the output end of static switch, but the ESD still tripped .The reason was that the ESD control loop is not self- holding loop. When the control loop is equipped with the self- holding loop which delays in return after the power loss, the power supply reliability of the regulator station equipment is ensured and the safety hazard is eliminated.

Keywords:gas power plant; regulator station; emergency shutdown device; self-holding loop

2018-07-47Optimizationresearchoncondenserrubberballcleaningtechnology

ZONGXudong(Huadian Power International Corporation Limited Technology Service Center，Jinan 250014, China)

Abstract:The condenser end difference and the cleanliness of the cooling pipes are important factors affecting the condenser vacuum. The cleanliness of the cooling pipes depends on the operating conditions of the rubber ball cleaning device. Analyzing the operation limitations of the traditional condenser rubber ball cleaning devices and comparing the theoretical research and operation results of domestic optimization technology in recent years, the unreliable technical route are identified and the optimal solution for the actual conditions of the power plant units are obtained.

Keywords:cleanliness; rubber ball cleaning; concentrating serving; robot; spiral ties

2018-07-50Faultanalysisandtreatmentduringcommissioningperiodofanew350MWsupercriticalheatingunit

ANZongwu1，MENGYingqi1,LIUChao1，LIChanghai1，WUZhongsheng2(1.Xi’an Thermal Power Research Institute, Xi’an 710032,China； 2.Shenzhen Energy Baoding Power Generation Company Limited, Baoding 072150, China)

Abstract:The 350 MW heating unit with separated high and medium pressure sub-cylinder which is made by Harbin Steam Turbine Factory Company Limited takes a new steam sealing to improve cylinder efficiency. But it also brings certain problems to the start and operation of the steam turbine. During commissioning period of the unit, there were large bearing vibration, water contained in low-pressure shaft seal, serious steam leakage of high-pressure cylinder at shaft end and other faults. Through the on-site troubleshooting, measures such as increasing the rotation rate set point of units warming , optimizing the valve flow control, reinforcing the vibration measuring bracket, eliminating the cylinder expansion resistance, and correcting the high-speed dynamic balance of rotor were taken. After the treatment, the main faults in the generating units are eliminated, which ensures the 168-hour successful trial of the retrofit unit with full load.

Keywords:steam turbine generator; bearing vibration；dynamic balance；shaft seal

2018-07-54Analysisandtreatmentoflong-timecoldstartofa330MWsteamturbineinapowerplant

SUNHaiyuan(Huadian Weifang Power Generation Company Limited，Weifang 261204，China)

Abstract:During the cold starting process of a 330 MW steam turbine of a company, due to unqualified impulse starting parameters, large temperature difference between high pressure and intermediate pressure cylinder caused by uneven expansion of different parts of the cylinders, and large vibration of shaft system, the unit took too long term from starting to grid-connection. It analyzes the influencing factors and puts forward solutions to solve the problem of too long-time start and improve the safety and economy of the unit.

Keywords:steam turbine; start time; impulse starting parameters; vibration of shaft system; cylinder warming; cold start

2018-07-56Reasonanalysisandcountermeasuresofashsloughingin1000MWdouble-reheattowertypeboiler

CUIXiaoguang(Guodian Taizhou Generating Company Limited，Taizhou 225327, China)

Abstract:Taking a 1 000 MW ultra-supercritical double-reheat updraft boiler an example, it considers from the structure arrangement of the heating surface, the flow rate of flue gas, the concentration of fly ash etc. It explores the main cause of ash deposition on the heating surface, and studies the reasons for ash sloughing. The countermeasures are put forward to guarantee the stable and safe operation of boilers.

Keywords:1 000 MW unit; ultra-supercritical unit；double-reheat; updraft boiler; ash deposition; ash sloughing; countermeasures

2018-07-59TechnicalandeconomicanalysisofnaturalgasheatingbywasteheatofLM2500+G4gas-steamcombinedcyclegenerator

MAQin1,2，LIWei1,2，CHANGNana1,2，WANGChenxi1,2(1.China Huadian Engineering Company Limited，Beijing 100160，China； 2.National Energy Distributed Technology Center, Beijing 100160，China)

Abstract:The LM2500 + G4 gas-steam combined cycle generator makes use of the waste heat from the HRSG to heat the natural gas intake system. The intake gas temperature is 20 ℃ normally and will be heated to 30～80 ℃.Through comparative analysis, the technical and economic performance is optimal when heating natural gas to 80 ℃, which not only significantly improves the comprehensive energy utilization efficiency of distributed energy system with LM2500 + G4, but also improve the economy, reliability and safety of the generator. Low temperature corrosion can be effectively prevented.

Keywords:gas-steam combined cycle；natural gas；heater；comprehensive utilization of energy；energy conservation

2018-07-62Vibrationfaultanalysisandcountermeasureoflow-pressurebearingofa1000MWunit

WANGHui(Guangdong Datang International Chaozhou Power Generation Company Limited, Chaozhou 515723, China)

Abstract:The cause analysis and treatment to the large vibration of#7 bearing of low-pressure cylinder in a 1 000 MW unit are made. Through the reinforcement of the condenser support pipe at lower part of low-pressure cylinder bearing, over vibration of the bearing is effectively solved. The scheme is simple, reliable and of low cost, which provides guarantee for the long-term safe and reliable operation of the unit and provides reference for relevant personnel.

Keywords:1 000 MW unit; low-pressure cylinder; vibration of the bearing; treatment

2018-07-64Businessstrategysimulationandtradingstrategyofpowergenerationenterprises

WANGHuixiang1，WANGQiuming2(1.Zhongshan Jiaming Electric Power Company Limited, Zhongshan 528437,China; 2.Guangdong Branch of Huaneng International Power Development Corporation, Guangzhou 510000,China)

Abstract:With the continuous deepening of China’s new power system reform, the competition model of the power market has been continuously updated, and power generation enterprises are facing unprecedented threats and challenges.According scheme of electric industry reform, power generation enterprises is gradually reducing the electricity output while their market proportion of electricity is keeping increasing. Therefore, power generation enterprises should make full use of the cost model, and conduct business simulation analysis and market electricity trading strategy research in advance according to business data of the enterprise. Besides, power generation companies can make full use of the external market to control costs and maximize the profits of enterprises.

Keywords:electric power enterprises; business strategy simulation analysis; trading strategy

2018-07-68ProblemsandcountermeasuresoftechnicalmanagementonoverseasEPCprojects

CAOChen(Sinohydro Bureau 8 Company Limited, Changsha 410004, China)

Abstract:Considering 3 engineering procurement construction (EPC) projects of thermal power in Sumatra, Indonesia, technical management problems and their causes existing in the fulfillment of overseas EPC projects are found out, according to technical management analysis. Solutions and advice is proposed, which provide reference for the better implementation of EPC projects.

Keywords:overseas EPC project; technologic management; problems and countermeasures

2018-07-70Studyonoptimizationschemeofcirculatingwaterinsystemcommissioningperiodofadomesticnuclearpowerplant

BAOHuanming,LIUKenan(State Nuclear Engineering Company, Shanghai 200233，China)

Abstract:A domestic nuclear power plant is the first AP1000 nuclear power plant in the world, and it is also the first domestic nuclear power plant using circulating pump with adjustable blade structure. The circulating water system is the debugging basis of the conventional island process system. Its debugging schedule is critical to other systems’ debugging. According to the characteristics of the circulating water system in the nuclear power plant, the commissioning period is optimized, which greatly shortens commissioning period of the system.

Keywords:nuclear power plant; circulating water system; circulating pump with adjustable blade; commissioning period; optimization

2018-07-74Annualenergyutilizationefficiencyimprovementschemeforbuilding-typenaturalgasdistributedenergysystem

YULi1,2,ZHANGZhen1,2(1.China Huadian Science and Technology Group Company Limited, Beijing 100160, China; 2.Huadian Distributed Energy Engineering Technology Company Limited, Beijing 100160, China)

Abstract:Due to the influence of mass concentration characteristics and corrosivity of lithium bromide solution, the exhaust gas temperature of the flue gas hot water lithium bromide unit of building-type distributed energy system cannot be lower than 160 ℃ during cooling period in summer. In order to reduce the exhaust gas temperature of the system, it proposes 2 schemes which are setting up a flue gas hot water heat exchanger at the exhaust outlet of the lithium bromide unit and providing domestic hot water externally, or increasing hot water flow that flow into the lithium bromide unit. Taking a distributed energy system project as an example, the annual average energy utilization efficiency of the 2 schemes are calculated and the results show that setting up flue gas hot water heat exchanger can reduce the system exhaust gas temperature, and greatly improve the annual average energy utilization efficiency.

Keywords:building-type natural gas distributed energy system; flue gas hot water lithium bromide unit; exhaust gas temperature; flue gas hot water heat exchanger; annual average energy utilization efficiency