2018-12-01FCBdesignandtestanalysisforthermalpowerunits

LIPeng,ZHAOQicheng(China Power Construction Engineering Consulting Central Southern Company Limited, Wuhan 430000，China)

Abstract:Unit with FCB function plays a significant role in power grid and power plants. Research on configuration selection of high/low pressure bypass and HP cylinder exhaust ventilation valves,effective volume and steam source switching of deaerator,feed water pump operation adjustment and the choice of reheating pressure are made. Combined with FCB test data of a subcritical 660 MW unit in Saudi Arabia, the main system parameters of the turbine are analyzed. The results show that the FCB function is feasible and the design selection is validated. It provides reference for the design and operation of FCB system in the future.

Keywords:thermal power unit；FCB；design；PCV valve

2018-12-04Evaluationofheatingsystemleakagecondition

FUQiang1,LIUYaowen1,ZHOUTian2,LIUHaibo1,ZHAOJia’ning2,ZHOUZhigang2,WANGRuixin2(1.Heilongjiang Longdian Electric Company Limited, Harbin 150000, China; 2.Harbin Institute of Technology, Harbin 150090, China)

Abstract:In recent years, there are frequent failures in domestic heating systems. It brings not only economic losses, but also social impacts. The construction of domestic heating network has developed rapidly since the 1990s. Many systems that have been around for 20 years and are in a high accidental rate period. Based on the investigation of the actual working state of pipe network, it analyzes the variation law of parameters during the heat medium leakage, and proposes a network leakage evaluation system based on the upload parameters. It gives corresponding suggestions for different evaluation results.

Keywords:heating system; make-up water pump; leakage fault；heating network

2018-12-08Summeryofdomesticandoverseasresearchongasturbinecombustionadjustment

XUTingting,DINGYang,ZHANGMengke,LIUZhimin(Huadian Electric Power Research Institute Company Limited, Hangzhou 310030, China)

Abstract:It introduces the mechanism and method of combustion adjustment, and compares the research objective and maturity of combustion adjustment technology at home and abroad. The domestic research is shallow and focuses on the consolidation and excavation of the combustion adjustment process. The overseas research focuses more on gas turbine services, which is more advanced than domestic research both in implementation scale and technology level. Therefore, gas turbine enterprises are encouraged to carry out research projects on combustion adjustment technology to promote the development of localization of gas turbines.

Keywords:gas turbine; combustion adjustment; domestic and overseas research

2018-12-13Over-temperatureanalysisandtechnicaltransformationof35t/hauxiliaryboiler

LIMao1，YOUBichao1，HOUYingli1，WANGLin2(1.Diandong Power Plant,Huaneng Yunan Diandong Energy Company Limited, Qujing 6555082, China; 2.Xi’an Thermal Power Research Institute Company Limited, Xi’an 710054, China)

Abstract:In order to solve the frequent tripping caused by steam over temperature after the start up of a unit and ignition of the boiler, combined with the field operation data, it is confirmed that excessive output of the burner under low load and the mismatching of heat absorption on different levels heating surface are the main reasons for the overheating of the steam.Accordingly, a comprehensive plan including burner, desuperheating water, furnace flue modification and furnace combustion adjustment is proposed.By adding a burner back leakage bypass, back leakage can be increased and nozzle output can be reduced. By using the secondary air swirl baffle and adjusting the flame shape, heat absorption capacity of the water wall can be improved.By implementing the furnace flue transformation and redistribution flue gas flow,the heat absorption of the superheater can be reduced.By replacing a large-aperture desuperheating water nozzle, the control of the steam temperature can be improved. After retrofit, startup of boiler is stable, and over-temperature shutdown is basically eliminated, and steam parameters of the boilers are basically reach the design value. Relevant experience can be used for reference by similar equipment in the future.

Keywords:auxiliary boiler; over-temperature; heat absorption matching; technical transformation; combustion adjustment

2018-12-16Faultanalysisofa600MWhydro-generatorstatorwindingdamage

QIJie(Goupitan Power Plant, Zunyi 564408，China)

Abstract:The differential protection and stator grounding protection of a 600 MW generator set in a large hydropower station suddenly operated during generator starting before griding，which caused the startup failure. Through the analysis on the protection action record and the fault recorded data before and after the fault, treatment and repair were made on the stator coil bar,the core and the rotor pole block that caused the fault.The fault was completely solved. The troubleshooting process is analyzed and suggestions for improvement are put forward from the relay protection.

Keywords:hydropower generator；600 MW； longitudinal differential protection； grounding protection； start-stop protection

2018-12-20Commongroundingfaultsandtroubleshootingmethodsforelectricalequipmentinthermalpowerplants

DUWenhua,ZHANGKui(Yangquan Coal Industry Group Xishangzhuang Thermal Power Company Limited, Yangquan 045000, China)

Abstract:Grounding of electrical equipment is an important technical measure to ensure the stable operation of thermal power plant systems and the safety of personnel and equipment. It introduces the grounding classification of electrical equipment in thermal power plants and the purposes of various types of grounding . It analyzes some common grounding faults and proposes common troubleshooting methods for them.

Abstracts

Keywords:thermal power plant; electrical equipment; grounding fault; troubleshooting

2018-12-24Bigdatasystemapplicationinthermalpowerinfrastructurequalitymanagement

YANGYadong(China Huadian Engineering Company Limited, Beijing 100160, China)

Abstract:According to the principle of full service life, the big data system in thermal power infrastructure quality management analyzes the acceptance data of the thermal power project and the construction quality evaluation data from the perspectives of project, profession, problem attribute, inspection item, responsible party and standard. It solves the difficulty in classifying and grading the quality process data and quality problems. Accurate and convenient approaches are provided to retrieve and export common quality problems in different construction phrases, which provides references for project companies. The standardization of the infrastructure management process is realized. The workload putting into operation in compliance with standard is simplified.The service quality of the construction project is improved, and the infrastructure management of the thermal power project is promoted to a scientific, standardization and informatization way.

Keywords:thermal power infrastructure; quality management; big data; full service life; grading

2018-12-27Causeanalysisandpreventivemeasuresofsteamturbinehigh-pressureanti-fuelpipefracture

SUNGuoqiang(Henan Branch, China Huadian Corporation Limited , Zhengzhou 450046, China)

Abstract:Based on the actual situation on site, the main reasons for the pipe fracture of high-pressure anti-fuel control system are analyzed, and the preventive measures are given.The recommendations for the repair, maintenance and operational supervision of anti-fuel system in daily work are given to improve the safety of anti-fuel system.

Keywords:steam turbine; anti-fuel; pipe; fracture; control system

2018-12-30Analysisonsafetyandstabilitycontrolofself-providedpowergridunitaspowerplummet

FANGJian,CHENHairong,XIAYuyu(Nanjing SAC Power Grid Automation Company Limited, Nanjing 211153, China)

Abstract:The problem of power plummet in the self-provided power grid of power generating enterprises is analyzed from multiple aspects and dimensions. According to the practical problems of the XF Group’s self-provided power grid, the corresponding control strategy is formulated for the power plummet, tripping after the power plummet and power plummet of the multiple units.

Keywords:self-provided power grid; power plummet; safety and stability control; control strategy

2018-12-33Craneselectionandhoistingprocessofthehigh-leveldesulfurizationtowerinstallation

YUHongzhu(SEPCOIII Electric Power Construction Company Limited, Qingdao 266100, China)

Abstract:The desulfurization and efficiency improvement project is to expand and renovate on the basis of the original desulfurization equipment and ancillary equipment. A new secondary spray tower are installed and every boiler is given double towers.The new spray tower and flue ducts are arranged in a high position.The working space is narrow, and there are many working planes and and crossed process.The selection process and main hoisting process of the main lifting machine for the desulfurization tower renovation and installation project are introduced.

Keywords:desulfurization tower；hoisting process；lifting machinery；spray tower

2018-12-36Analysisofcabletemperaturefieldandcurrentcarryingcapacitybasedonfiniteelementmethod

QIJiawei(Customer Service Center, State Grid Henan Electric Power Company, Zhengzhou 450000, China)

Abstract:As an important equipment for power transmission and distribution systems, cables have on affection on electric capacity and transmission reliability of cities. A large number of complicated parameters determine the current carrying capacity of the cable. There will be large error in determining the current carrying capacity of cable solely according to the IEC 60287-2-1—2015ElectricCables-CalculationoftheCurrrentRatingstandard, which cannot meet the actual needs. Finite element method is used to obtain the current carrying capacity of the cable. The correctness and effectiveness of the method are verified by COMSOL software and simulation tests. Suggestions that benefit for the cable laying and cable current carrying capacity improvement are given.Meanwhile, it is proved that this method has practical significance for the safe and economic operation of power cables.

Keywords:power cable; finite element method; current carrying capacity; COMSOL software

2018-12-39Designof2000kNgantryhoistatthetopofHekouVillageReservoir

SHITianming1,LEIHai2,ZHANGXiaohui3,TONGYanfeng4(1.Zhengzhou Hydraulic Machinery Company Limited, Zhengzhou 450042, China; 2.Standard and Quality Control Research Institute, MWR, Hangzhou 310012,China; 3.Yellow River Engineering Consulting Company Limited, Zhengzhou 450003, China; 4.Sanmenxia Xinhua Hydraulic Machinery Company Limited, Sanmenxia 472000, China)

Abstract:The 2 000 kN gantry hoist at the top of Hekou Village reservoir runs in one direction which is same as the direction of flow. The downstream gate chamber is close to the edge of the platform. As designing the hoist according to the conventional scheme, it is necessary to expand the platform and increase the workload of civil construction. Decreasing the base distance will affect the safety against wind and stability of the hoist. In order to solve these problems, comparison and optimization of the hoisting mechanism layout are carried out. It proposes the eccentric arrangement scheme of lifting point center and gantry hoist center in the direction of the base distance , which successfully solves the above problems and saves the engineering investment. The new landscape machine room not only meets the equipment protection requirements, but also meets the landscape requirements,which can be used for similar projects.

Keywords:Hekou Village Reservoir; gantry hoist; landscape machine room

Abstracts

2018-12-42SelectioncalculationofmainhoistingmechanismoffixedwinchhoistinWunonglongHydropowerStation

ZHANGWenke(Huaneng Lancang River Hydropower Company Limited, Kunming 650200, China)

Abstract:Based on the selection calculation of the hoisting mechanism for the 2×2 500 kN-34 m fixed winch hoist at the tailwater tunnel exit of Wunonglong Hydropower Station, the calculation document and depth of design that should be provided to the mechanism with the same type during the design review stage are proposed, which provides a powerful guarantee for reasonable design and safe operation.

Keywords:hydropower station；hoist; wire rope; reel calculation; reducer; stress；tailwater tunnel；hoisting mechanism

2018-12-45StressanalysisandresearchontheflexiblewaterstopdeviceoftheshipliftopenchannelinGoupitanPowerPlant

MAYaopo(Goupitan Power Plant, Zunyi 564408, China)

Abstract:Flexible water stop device is connected the open navigation channel of ship lift and the steel gate in Goupitan Power Plant. The device has the characteristics of simple design, convenient construction, economy and practicality. According to the construction form of the device, the mechanical properties of the base, U-shaped pressure plate and water-stop rubber are analyzed. The results show that the strength of the weld for base and U-shaped plate can meet the requirements, and the water-stop rubber can provide double security. Finally, combined with the calculation results, the problems that need attention in the construction are explained, and the optimization suggestions are put forward.

Keywords:ship lift; flexible water stop device; force analysis; construction

2018-12-48Utilizationmodeandbenefitanalysisofbiomassbiogaspowergeneration

LILi(China Huadian Engineering Company Limited,Beijing 100160, China)

Abstract:Cogeneration is an acknowledged energy-saving technology, and its comprehensive efficiency of energy cascade utilization is about 80%. Based on the principle of improving energy utilization efficiency, this method should be adopted by biomass biogas power generation projects.Taking the biogas produced from waste comprehensive treatment in a large scale pig farm as a reference, it introduces the cogeneration technology in biogas engineering. Based on the simple balance of energy in the system, quantitative analysis is made on power generation and cooling. The results show that the biogas power generation systems can not only generate electricity, but also produce hot and cold water (7～10 ℃) by using the low-grade heat in flue gas and cylinder liner water, which improves the comprehensive efficiency of energy utilization and provides theoretical basis for engineering practice.

Keywords:cogeneration; biogas power generation; waste heat utilization; cooling; quantitative analysis

2018-12-50Selectionandmatchingofreelropegrooverotationandwireropetwistingdirection

WANGPengge1,SHIXiaofei1,ZHAOXiaowei1,DINGZhenxing2,ZHANGJingyong1(1.Huadian Zhengzhou Mechanical and Design Institute Company Limited, Zhengzhou 450046, China; 2.Nanning Exploration and Survey Institute, Nanning 530022, China)

Abstract:Reel and wire rope are common accessories in all kinds of cranes. How to correctly select the direction of rope groove rotation and wire rope twisting are critical to the life and safety of the steel rope. It introduces the method of judging the twisting direction of the wire rope and the rotation direction of the rope groove. According to the structural characteristics of the wire rope and the rope groove, the matching principle between the two ropes is scientifically explained. Finally, a common and simple selection principle is given after the combination of the left-hand and right-hand principle.

Keywords:crane; rotation direction of reel rope groove; twisting direction of wire rope; selection and matching

2018-12-53Analysisofstandardtestmethodofarsenicinimportedandexportedcoal

DINGYan(Jinzhou Customs of People’s Republic of China, Jinzhou 121000, China)

Abstract:It studies three basic methods for arsenic detection in imported coal, and discusses the advantages and disadvantages of different detection methods from experimental principle, testing procedure, cost control, accuracy and precision of data,which provides references for the laboratory to select detection methods of arsenic.

Keywords:imported and exported coal; arsenic in coal; sources of energy

2018-12-56BriefanalysisofreducingmethodforTOCmassconcentrationinboilermake-upwater

XINGYaoyu(Huadian Qingdao Power Generation Company Limited, Qingdao 266031, China)

Abstract:The mass concentration of TOC in boiler make-up water has been exceeding the standard due to the large amount of water supply during heating. The cation conductivity of make-up water and steam are way below the standard. Analyzing the TOC source of boiler make-up water and the TOC removal ability of water treatment equipment, a solution is proposed to solve the problem of unqualified boiler make-up water and steam.

Keywords:TOC mass concentration; water treatment; boiler make-up water; reverse osmosis; seawater desalination

2018-12-58Inspectionandtreatmentofamulti-pointgroundfaultofanexcitationtransformercore

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

Abstract:Failure of the relevant components of excitation transformer (core body, clamps, pull plates, grounding devices, etc.) will affect the safe operation of the transformer. The multi-point grounding of the iron core will create a closed loop between the grounding points. There is magnetic flux and induced potential at the linking parts, which can form a circulating current and lead to local overheating. The rise of the local core temperature of the transformer will accelerate the insulation aging and even cause the high-temperature trip protection. Therefore, the multi-point grounding of the iron core is extremely harmful to the transformer.It must be taken seriously and eliminated. Taking the multi-point grounding of a gas turbine excitation transformer core as an example, the method is analyzed, and some suggestions are provided for the maintenance and repair of related faults.

Keywords:excitation transformer; iron core; multi-point grounding; temperature rise; insulation

2018-12-60Mercuryremovalcharacteristicsofdomesticcoal-firedpowerplantpollutantcontroldevice

SUJunhua,LIChao(China Huadian Engineering Company Limited, Beijing 100160, China)

Abstract:Three typical domestic coal-fired power plants are chosen.Through mercury balance analysis in coal and flue gas，mercury pollution extend of power plants are understood, and the mercury removal ability of existing denitrification equipment,bag filter, electrostatic precipitator and wet desulfurization equipment are evaluated,which provides a theoretical basis for developing corresponding control measures of mercury pollution.

Keywords:coal-fired power plant; mercury removal; pollutant control device; mercury balance

2018-12-63DiscussiononenvironmentalprotectionsupervisiononFGDsystemoperationincoal-firedpowerplant

ZHANGJianhua，F(xiàn)ENGYingshan(Fujian Branch, China Huadian Corporation, Fuzhou 350001，China)

Abstract:Fujian Huadian Kemen Power Generation Company Limited takes limestone-gypsum wet desulfurization method to desulfurize flu gas. Based on the operation of the desulfurization system, the daily operation, maintenance and management of the desulfurization system, the factors affecting the operation of FGD system are analyzed. The abnormal conditions in the desulfurization system are summarized. The emphases on daily environmental protection supervision of the desulfurization system are determined.

Keywords:coal-fired power plant; FGD; environmental supervision

2018-12-66Caseanalysisofultra-lowemissionengineeringofbagfiltersina660MWcoal-firedunit

MENGJunya,DINGTao(Department of Engineering Technology, Zhoukou Longda Power Generation Company Limited, Zhoukou 466100, China)

Abstract:Taking the selection of bag filters for 2×660 MW coal-fired units as an example, it expounds the reasons for improving the selection of boiler dust removal equipment with the changes of national environmental protection policies, strict environmental protection standards and the development of boiler dust removal technology. It also conducts technical and economic analysis.Through the equipment selection,the aim of ultra-low emission required by environmental protection has achieved, which provides experience for the realizing ultra-low emission of units of the same type.

Keywords:dedusting equipment; electric bag dust collector; bag filters; ultra-low emission; environmental protection; standard

2018-12-69StudyoncrystallizationcomprehensivetreatmentofSCRdenitrationureapyrolysissysteminthermalpowerplant

WANGChaojun(Datang Luoyang Thermal Power Company Limited, Luoyang 471003, China)

Abstract:The urea crystallization of the pyrolysis furnace in the selective catalytic reduction (SCR) denitration system of thermal power plant will lead to the failure of operattionof the whole denitration system. The case of the urea crystallization of the denitrification pyrolysis furnace of No.6 unit of Datang Luoyang Thermal Power Company Limited is taken as example to analyze the reason for the crystallization of urea in SCR urea pyrolysis furnace. The system design optimization scheme is proposed to effectively control the crystallization problem. It is hoped that the phenomenon of urea crystallization in the pyrolysis furnace can be effectively prevented and targeted countermeasures can be provided.

Keywords:denitrification reform; pyrolysis furnace; urea crystallization

2018-12-72Effectofreverseosmosisnon-oxidizingbiocidedosingoninfluentSDIvalue

JIANGKai1,ZHUMengqi1,LONGXuwei2,LUJiali1(1.Hangzhou Huadian Jiangdong Thermal Power Company Limited, Hangzhou 311200, China; 2.Nanjing University of Science and Technology, Nanjing 210000, China)

Abstract:Due to operating conditions and environmental conditions, influent water of reverse osmosis is unqualified (pollution index of reverse osmosis membrane is high). Ultrafiltration tank has to be flushed frequently, which results in the increase of workload , water resources and operating costs. By optimizing the dosing position and dosing strategy of the reverse osmosis non-oxidizing biocide, the number of unqualified reverse osmosis water is greatly reduced. The influent water quality is effectively controlled, waste and operating cost are significantly reduced. It also improves the economy and the reliability of reverse osmosis equipment , which can provide reference for the similar projects.

Keywords:reverse osmosis; reverse osmosis membrane; silting density index (SDI); non-oxidizing biocide; microorganism; economy

2018-12-74Analysisondeeprecoveryandutilizationofwasteheatingas-firedpowerstations

WANGXin(Huadian Fuxin Guangzhou Energy Corporation Limited, Guangzhou 510000, China)

Abstract:In view of the utilization of waste heat in gas-fired power plants, the deep utilization of waste heat of waste heat boilers and steam turbines in power plants is analyzed.The waste heat utilization systems of flue gasand steam turbine are integrated and optimized to improve the overall utilization efficiency of waste heat and achieve energy saving and emission reduction.

Keywords:flue gas; waste heat recovery;gas-fired power station