Abstracts

Abstracts

Abstracts

Abstracts

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2017-03-01 Study on the backpressure correction curve of 600 MW direct air cooling unit and the backpressure of economic operation

ZHANG Xuehai(Huaneng Tongchuan Zhaojin Power Plant, Tongchuan 727100, China)

Abstract:To study the 600 MW direct air-cooling unit backpressure economical operation, backpressure chocking was calculated by adopting equivalent heat drop principle. By adopting the steam turbine power net increment method to calculate the different load is obtained under different environmental temperature, air cooling fan frequency curve and the fitting formula of economic operation, for the economic operation of the same kind of direct air cooling unit to provide the reference.

direct air-cooling unit; backpressure chocking; backpressure correction curve; equivalent heat drop principle; economic frequency

2017-03-05 Heat supply unit water-steam system organic matter behavior study

WANG Guorong(Wangting Power Plant, Suzhou 215155，China)

Abstract:As the large capacity and high parameter unit into power assistant unit, pure power of large and medium-sized unit under huge pressure, heating to reform is of great significance to improve the economic benefit. After reforming heating due to the increase of filling water, water the influence of organic matter on the unit water vapor quality even more outstanding. Web of processing system from the furnace to the furnace water system to research the behavior of organic matter removal efficiency of organic matter, organic matter in different stages of the study system for water quality as well as to the role of the boiler heating surface corrosion, the influence of the unit for heating water treatment system improvement are proposed.

Keywords:large and medium scale unit; heat supply; water-steam system; organic matter; corrosion

2017-03-09 Principle of contact resistance of alternating current sampling circuit and its simulation analysis

SUN Beijun, XU Liqing, CHEN Xinzhi(Nanjing SAC Automation Company Limited, Nanjing 211153, China)

Abstract:This paper analyzed the resistance characteristics of alternating current sampling circuit of protective control device in intelligent substation and proposed the contact resistance model of alternating current sampling circuit. Firstly, this paper built a simulation model of contact resistance of alternating current sampling circuit using the Matlab Simulink software. Then it analyzed the influence of contact resistance variation on signal transmission and verified it by simulation through adjusting the resistance parameters among terminals. At last, it proposed some reasonable suggestions to preventing the contact defaults of connector.

Keywords:connector; contact resistance; alternating current sampling; protective device; intelligent substation

2017-03-12 Large scale coal-fired power plant boiler blowing technology and application status

ZHANG Guangcai, WANG Yikun, LIU Honggang, XIE Bing(Xi’an Thermal Power Research Institute Company Limited, Xi’an 710032, China)

Abstract:In coal-fired power plant boiler operation, heating surface deposition and slagging is unavoidable. To ensure the operation safety, this has to be control. This paper introduced and compared steam blowing, hydraulic blowing, gas pulse soot-blowing and kinds of sonic soot blowing. Suggestion on application was provided.

Keywords:coal-fired power plant; boiler; steam blowing; hydraulic blowing; gas pulse soot-blowing; sonic soot blowing

2017-03-16 Water supply pump steam turbine high backpressure heat supply reconstruction technology study and application

LUAN Jun1, JIANG Jianping1, GAO Peng2(1.Huaneng Jinan Huangtai Power Generation Company Limited, Jinan 250002, China; 2.Shandong Hong’ao Power Technology Company Limited, Jinan 250002，China)

Abstract:For the reconstruction of 330 MW unit water supply pump steam turbine high backpressure heat supply reconstruction, a series of technical measurements to ensure operation stability and economic efficiency was indicated. This could be referred by similar type of unit for energy saving.

Keywords:high backpressure; heat supply; water supply pump steam turbine; heat system improvement; stability

2017-03-19 Design of radial gate for spillway of Qincun Reservoir

LIU Guorui(Zhejiang Design Institute of Water Conservancy and Hydroelectric Power, Hangzhou 310003, China)

Abstract:Based on the feature and function of Qincun Reservoir, radial gate was selected. This paper introduced the structure and design feature of radial gate. In the common oblique branch arm structure, slightly lifting the upper frame will even the load on upper and under frame, and will increase the gate overall rigidity. To eliminated vibration while leakage, steel with less strength was used on gate, and higher strength steel on gate frame. Alignment of hinges was optimized to avoid interference while opening and closing. Fine lubricity and mesh accuracy requires less maintenance.

Keywords:reservoir; radial gate; support hinge; closed type hoist; design

2017-03-21 Discussion on the method of 390H generator rotor demagnetization

WANG Zhongming(Guangzhou Zhujiang Natural Gas Power Generation Company Limited, Guangzhou 511457, China)

Abstract:To solve the magnetization problem of journal, sliding ring, fan disk of 390H type rotor journal, sliding ring, fan disk central ring and other parts, the causes were analysed. At the scene of the demagnetization short time limit, the insufficient capacity of ac voltage regulator, steam turbine side guard ring did not pull out the conditions, comprehensive the direct current demagnetization method and ac demagnetization method is adopted to be magnetized parts separately demagnetization, demagnetization effect is good, completely eliminated the generator bearing damage, journal electric burns safe hidden trouble.

Keywords:generator；rotor；magnetization；DC demagnetization；AC demagnetization

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Abstracts

2017-03-25 Study and application of bowl type medium speed pulverizer overall performance improvement

ZHENG Xifeng, LÜ Zhenzhen(Huadian Luohe Power Generation Company Limited, Luohe 462300, China)

Abstract:To solve the problems such as coal bunker frequent jam, air seal leakage and powder pipe blockage, improvement reconstruction of coal bunker, air seal, hot air isolation valve and pulverizer impeller was carried out. The lifetime of vulnerable parts was evaluated. An integrated performance improvement plan for bowl type medium speed pulverizer was established. This could be referred by similar power plant.

Keywords:bowl type medium pulverizer; coal bunker; air seal; hot air isolation valve; life evaluation

2017-03-28 Discussion on “hand in hand” reconstruction of gas turbine power plant service power system

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

Abstract:Gas turbine power plant usually adopted peak load operation mode. To reduce the off-grid power while shutdown, the so-call “hand-in-hand” reconstruction to integrate the service power systems between units was carried out. This paper detailed introduced the operation process and the risks existed. This could be referred by similar power plants.

Keywords:gas turbine power plant；service power；off-grid power；hand-in-hand；risk

2017-03-31 Steam air heater dewater pumps of different size one-operating-one-standby control problem and solution

LI Xinjian(Huadian Weifang Power Generation Company Limited, Weifang 261204, China)

Abstract:This paper introduced the application of steam air heat dewater pump in a power plant. Based on the requirement of auto-control of steam air heat dewater pumps of different size one-operating-one-standby, the control method of shared setting value on two manual controllers and two individual PID regulating was indicated. Which fulfilled setting value undisturbed switching and ensured adjusting two pumps of different size.

Keywords:air heater; dewater pump; one-operating-one-standby; size pump control; balance of directives; shared setting value; undisturbed switching

2017-03-33 Study of the influence of steam temperature of shaft seal on the life of 600 MW supercritical steam turbine rotor

ZHANG Gaohui(Fengjie Power Plant of Huadian Power International Corporation Limited, Chongqing 404600, China)

Abstract:In the process of large thermal power unit to participate in grid peak regulating, variation in turbine shaft sealing system parameters causes the rotor at shaft seal to bear alternating stress effect, and finally causes the life loss of rotor. Taking the appearing problems in the commissioning of a certain Huadian power plant as a basis, this paper introduces the influence of steam temperature variation of shaft seal on the life of rotor when current power plant system is in variable load operation. After that, it proposed some corresponding improvement measures in aspects of operation and technical management, which has a certain reference significance for the life management of similar units.

Keywords:peak regulating; rotor; steam temperature of shaft seal; life loss

2017-03-36 1 000 MW primary fan increasing vibration cause analysis and solution

CAO Jingfang(Huadian Power International Corporation Limited Zouxian Power Plant，Zoucheng 273522, China)

Abstract:A power plant’s 1 000 MW unit YKK710-4W type primary fan passed the vibration test after overhaul. In the three months after, vibration kept increasing till over limit vibrating and threatened to unit operation safety. By vibration diagnostic and current spectrum analysis, the primary cause was found as the contact surface of adjusting washer was too small. After changed washer to proper size, this issue was solved.Damage extending and over-maintenance of generator was avoided. This shortened the maintenance period, reduced cost and effectively ensured equipment safety.

Keywords:YKK710-4W type primary fan motor; vibration diagnostic; power spectrum analysis; adjusting washer

2017-03-39 Linear optimal transformation of internal leakage treatment and regulation for reheater attempering water control valves of 1 000 MW unit

WEI Daojun,WAN Zhirong(Huadian Laizhou Power Generation Company Limited, Laizhou 261441, China)

Abstract:Based on the problem of a power plant’s No.1 and No.2 boiler reheater attemperating water control valve leakage at zero opening, this paper introduced the improvement plant that changed the control valve core to triple seal structure, change the throttle sleeve to triple stage control structure, and change the valve control cure to equal percentage characteristic. After this improvement, the leakage at zero opening was eliminated. Valve flow control linearity is fine. This could be referred by similar control valve improvement project.

Keywords:reheater attemperating water control valve; internal leakage; small opening; linear adjusting; equal percentage character

2017-03-42 Steam turbine primary high pressure adjusting steam stigma valve mechanical jam analysis and emergency measures

GONG Li, SUN Gailing(Hubei Huadian Jiangling Power Generation Company Limited, Jingzhou 441041, China)

Abstract:Frequent load dip was occurred in Xiangyang Power Plant No.1 Unit. After detailed analysis and test, this was caused by mechanical jam after opening of 80%. To solve this problem, emergency measures were taken and ensured operation. This defect was eliminated after shutdown.

Keywords:300 MW steam turbine；load dip；septum valve；high jam

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Abstracts

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2017-03-44 Economy and feasibility analysis of desuperheating water transformation of a superheater

WANG Donghui(Baiyinhua Jinshan Power Generation Company Limited, Xilingol 026200, China)

Abstract:Desuperheating water of superheater is the most important mean for main steam temperature regulating because of its simple structure and rapid temperature regulation. Through transforming the connection method of desuperheating water, this paper analyzed the feasibility and economy of transformation, and proposed reasonable suggestions for the existing problems after transformation.

Keywords:desuperheating water; specific enthalpy; economy; transformation

2017-03-47 Improvement practice of circular enclosed coal yard laser inventory counter

CHEN Wei, LIU Yi(Huadian Laizhou Power Generation Company Limited, Laizhou 261441, China)

Abstract:There is blind spot if laser inventory counter was mounted on the stacker boom in circular coal yard. After analysing the cause in site, the laser counter was taken off from stacker boom and mounted onto the reclaimer boom. After this change, the accuracy of counter was increased.

Keywords:circular enclosed coal yard; laser inventory counter; reconstruction

2017-03-49 220 kV transformer slight gas protection reaction analysis and treatment

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

Abstract:As the primary protection for oil immersed transformer, gas protection reflected the kind of inside failure. Normally, slight gas reaction to warn, and heavy gas protection to trip. By analysing a slight gas reaction of a 220 kV transformer, a false warn caused by moisture absorber blockage was found. This could be referred for oil immersed transformer maintenance.

Keywords:oil immersed transformer; slight gas reaction; moisture absorber

2017-03-51 The design and application of dual power auto switch device

YUAN Siyuan(Anhui Huadian Suzhou Power Generation Company Limited, Suzhou 234000, China)

Abstract:A dual power supply auto switch device based on moulded case circuit breaker and AC contactor was designed. The application of this device in Anhui Huadian Suzhou Power Generation Company Limited was indicated. This device is reliable, and easy to install and wiring.

Keywords:dual power supply; auto switch; AC contactor; power distribution cabinet; backup power supply

2017-03-53 Reason analysis of 380 V switch override in desulfurization system and its treatments

TIAN Yuqin(Yunnan Huadian Kunming Power Generation Company Limited, Anning 650308, China)

Abstract:The incident that a power plant’s 380 V desulfurization system busbar incoming switch override tripped multiple times was analysed. The main cause was determined that the load was improperly distributed and improper protection value setting. After redistributed the critical load and adjusted the setting valued, the stability of desulfurization system was increased.

Keywords:desulfurization system；incoming switch；override trip；breaker；load distribution; protection setting

2017-03-55 Practical application of blowpipe technology in a tri-drum heat recovery boiler of the 9F class 475 MW gas turbine

YAN Xi, ZHANG Qingguo, WANG Yongjia, XIAO Guanhua(Shandong Branch of Huadian Electric Power Research Institute，Jinan 250000，China)

Abstract:This paper analyzed the technical requirements of boiler blowpipe with energy storage and pressure-reducing method, introduced the detailed process of blowpipe with energy storage and pressure-reducing method for a tri-drum heat recovery boiler of the 9F class 475 MW gas turbine in a certain power plant, and presented the control points in blowpipe process. Through theoretical analysis and practical verification, the blowpipe process performs excellent.

Keywords:blowpipe with energy storage and pressure-reducing method; heat recovery boiler; steam drum

2017-03-57 Cause analysis and treatment of the fault of spiral conveyor in BBD3854 pulverizer

SANG Changyong, DU Fuming, GAO Quanhai, LI Xinjian(Huadian Weifang Power Generation Company Limited, Weifang 261204, China)

Abstract:This paper analysed the breakage incident of Huadian Weifang Power Generation Company Limited’s BBD3854 type double-in-out pulvervizer spiral conveyor support stick. Two improvement treatments were indicated. During overhaul, spiral conveyor was changed to elasticity self-compensating structure. The risk was eliminated, system capacity was increased.

Keywords:pulverizer；spiral conveyor；support stick；crack；breakage；abrasion；elasticity self-compensating structure

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2017-03-60 Design of locking circuit for preventing misoperation of grounding switch in low voltage side of transformer

SHI Shengyang, LI Shizhao(Yunnan Huadian Ludila Hydro Power Company Limited, Dali 671600, China)

Abstract:To prevent operating crew operate the grounding switch while transformer energized, high voltage display and locking device was adopted. By connecting multiple operating circuits in series with grounding switch, the risk of misoperation was effectively reduced. The safety and stability of electrical system was ensured.

Keywords:transformer; grounding switch; contact point; misoperation

2017-03-62 Indication and application of a simplified method to detect silicon dioxide content in desulfurization limestone

PAN Lina(Huadian Laizhou Power Generation Company Limited, Laizhou 261441, China)

Abstract:The limestone-gypsum method desulfurization process is widely applied in thermal power plant. The process of limestone acceptance is complicated. Based on GB/T 176—2008MethodsforChemicalAnalysisofCement, the reference method requires more than 20 hours. The instead method in GB/T 5762—2012MethodsforChemicalAnalysisofLimestone,QuicklimeandHydratedLimeforBuildingMaterialsIndustryneeds more than 10 hours. By innovating test procedure, the simplified method reduced the test duration from three working days to one working day, and reduced the drug consumption. Test deviation is acceptable for site limestone acceptance.

Keywords:limestone; silicon dioxide; acid non-soluble substance; reference method; instead method; simplified method

2017-03-68 Measures of energy saving and consumption reduction during shutdown of thermal power units

WANG Wei(Hunan Huadian Changsha Power Generation Company Limited, Changsha 410000, China)

Abstract:To reduce the energy consumption while thermal power unit reserving, the main energy consumption in reserving period was analysed. After set the hydrogen pressure to 0.150 MPa and stopped cooling water system, hydrogen dryer, close type pump and oil-seal pump, the hydrogen purity and dew point satisfied the requirement and would save 800 000 Yuan on energy and maintenance.

Keywords:thermal power unit；shutdown to reserve；hydrogen pressure；dew point；energy consumption

2017-03-70 Application analysis of circulating bucket technology in flue gas desulfurization absorber tower

WANG Zhijiang1, ZHANG Chun2, ZHOU Zhongqiang3(1.China Huadian Engineering Company Limited Environmental Protection Company Nanjing Branch, Nanjing 210000, China; 2.SINOPEC Pipeline Research Institute, SINOPEC Pipeline Storage & Transportation Company Limited, Xuzhou 221008, China;3.Marketing Department, SINOPEC Pipeline Storage & Transportation Company Limited, Xuzhou 221008, China)

Abstract:In absorber tower slurry area of power plant flue gas limestone-gypsum wet method desulfurization system, problems of oxidation air slurry undermixing and gypsum stacking are common. The principle, structure and application of circulating bucket technology was introduced. This technology is effective to solve the problems mentioned above.

Keywords:wet desulfurization; absorber; oxidation air; slurry; circulating bucket

2017-03-72 Practice of heat-power cogeneration and energy saving and emission reduction

ZHAO Fangming(Yunnan Huadian Kunming Power Generation Company Limited, Anning 650308, China)

Abstract:Heat-power joint operation is the technological upgrading project that combined heat-power cogeneration, energy saving & energy saving, resources comprehensive utilization, circular economy and other concepts. Based on the policy, cost, profit measurement and analysis of investment revenue, this project has fine profit ability, to improve the production and operation of thermal power enterprises, play a positive role, and provide reference for working on the technical workers.

Keywords:heat-power joint operation constitute; energy conservation and emission reduction application; heat supply network

2017-03-74 Floating photovoltaic power generating system

WANG Hongyu, WANG Peiming, LI Yanhong, ZHAO Xiaoguang(China Huadian Engineering Company Limited, Beijing 100160, China)

Abstract:Floating photovoltaic power generation is a new concept that was not widely promoted. This paper compared the merit and demerit of floating photovoltaic power generation system with ground photovoltaic power generation system and curtain wall distributed photovoltaic power generation system. The variety and current situation of floating photovoltaic power generation system was introduced. A few important problems were indicated.

Keywords:floating photovoltaic power generation；fixed buoy；azimuth tracking buoy；floating part