Integrated Intelligent Energy

Association analysis of economy and security of AP1000 nuclear power technology

HUO Qijun, ZHOU Tao, YANG Xu, et al.

2015, 37(5): 1-3.

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Abstract:The economic efficiency of nuclear power is associated with its security. The AP1000 was compared with typical nuclear power plants in operation,and it was found that the AP1000 thechnology has higher security and lower economic efficiency. It is wrong to neglect security for economic efficiency,and it is also wrong to reduce economic efficiency for higher security. The key to get higher economic efficiency is independent intellectual property rights of designing and making of the major equipments. In addition,the standardization and larger quantities of AP1000 construction are useful for higher economic eficiency. It is also need to pay more attention on combining the passive technology with the active technology.

Retrofit and optimization of steam turbine supervisory system of Ling′ao Nuclear Power Plant

HU Yanjun, WANG Jun

2015, 37(5): 4-8.

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Abstract:Taking the units No. 1 and No. 2 of Ling′ ao Nuclear Power Plant phase I as examples, the problems, which existed in operation of ALSTOM TYPE7 system used in steam turbine supervisory system, were analyzed.Using MMS6000 system manufactured by epro GmbH, the steam turbine supervisory system was retrofited, and the signal channels were optimized. The stability and reliability of the system were improved.

Analysis on improvement of pressure water injection design for circulating water system of a nuclear power plant

ZHANG Baoguo, MA Jingwei, LI Tiefeng

2015, 37(5): 9-11.

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Abstract:Basic information of the circulating water system of a nuclear power unit was introduced. Based on analysis, it was pointed out that there is not pressure water injecton design in this system, and due to influence of tide levelthe unit startup may be delayed. The pipeline of circulating water and related equipments were analyzed, and a priliminary thermodynamic estimation was carried out. Based on these,the pressure water injection of the circulating water pipeline was proposed, and a method of small flow circulation during downtime was given.

Technical characteristics of steam generator nozzle dam in Sanmen Nuclear Power Plant unit No. 1

LU Jing, ZHAO Wenbing

2015, 37(5): 12-13.

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Abstract: The sealing principle, the basic structure and the main components of the nozzle dam of the steam renerator in Sanmen Nuclear Power Company Limited were introduced.The
site installation of the nozzle dam of the steam generator No. 1 of Sanmen Nuclear Power Company Limited was discribed.The matters needing attention during nozzle dam installation process were summarized. The nozzle dam of Sanmen Nulear Power Company Limited was compared with the nozzle dams of other nuclear power stations.The advantages and the disadvantages of the nozzle dam of Sanmen Nulear Power Company Limited were summarized, and the suggestions for improvement were proposed.

Influence of the oxygenated treatment of boiler feedwater on forming and shedding of oxide skin in steam side of austenitic pipe

CAI Hui, XIONG Wei, TANG Liying, et al.

2015, 37(5): 14-20.

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Abstract:The pipes of the finishing superheater and the reheater of the boiler of a power plant were investigated experimentally.The pipe samples were obtained in different time periods under different oxygenation treatment modes. The experimental methods includes the microstructure analysis,the grain size measurement, the inner wall oxide layer metallographic analysis and the scanning electron microscope ( SEM) analysisand Xray energy dispersive spectrometer ( EDS) analysis for typical inner wall oxide layer structure.The results show that the feedwater oxygenatin treatment can acilitate forming of Fe2O3 outer shell of oxyde layer in pipe inner wall.The sample tubes of the finalstage reheater of a boiler were oxygenated most seriously, the percentage of the sample tubes,in which there was not the fine grain zone in inner wall, is larger. In the inner wall of the sample tubes,the uniform and continous Crrich layer did not formed, and this is one of the main reasons caused the oxide skin to shed concentratedly.The feedwater oxygenation treatment is a factor to promote the oxyde skin to shed.

Precision inspection system of equipments of thermal power plant and its application

KE Yulong, CHEN Guang, WU Zhengfeng, et al

2015, 37(5): 21-23.

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Abstract:In domestic thermal power plants, there always were problems of excessive equipment maintenance and insufficient equipment maintenance.The precision inspection system of China Huadian Corporation was introduced. In the system, five technologies, the vibration analysis, the infrared analysis,the ultrasound analysis, the oil analysis and the motor current analysis,were combined to grasp the equipment operation situation all sidedly and exactly.The application of the system in power plantsshows that large amount of equipment defects were found and eliminated by the precision inspection.The equipment emergency repair was reduced greatly, and the unit load reducing operation and unplanned shutdown incidents were avoided repeatedly.Theequipment management level of thermal power plant was raised effectively.

Analysis and treatment of protection fault information based on modern simulation software

LIU Bing

2015, 37(5): 24-26.

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Abstract:A fault record file analysis method was introduced. In the method, the modern simulation software MATLAB and PSCAD were combined to analyze the fault record file based on COMTRADEformat to obtain the original data of relay protection devices during power equipment fault. The method can be used in behavioural analysis, fault reappearance,fault simulation and accident identification for relay protection tripping, which is an effective auxiliary way to solve practical problem.

Optimization strategy for coordinate control system of thermal power unit

WENG Jiang

2015, 37(5): 27-29.

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Abstract:In order to improve the adaptability of thermal power unit to coal grades, the origional coordinate control system of the unit was optimized and adjusted.The advanced coal quality forecast control strategy was adopted to amend the coal quality. At the same time, the temperature control of the main steam and the logic parameters were optimized.After optimization, the unit can suit to coal grade variation, and the main parameters were controlled in beter level. The safe and stable operation of the unit was ensured.

Selection of steam turbine for gasfired distributed energy system

WANG Jianwei

2015, 37(5): 30-31.

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Abstract:Based on theoretical analysis, the importance of steam turbine type selection for gasfired distributed energy system was demonstrated. According to concrete example,the principle and the method of steam turbine type selection for gasfired distributed energy system were expounded.To select steam turbine for a project by the method presented in this paper can ensure fine technical performance and favorable economic efficiency of the project.

Control of vibration of 300 MW unit with reformed steam seal

QIU Weikun

2015, 37(5): 32-34.

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Abstract:The steam seal of the steam turbine of unit No. 4 in Jiangsu Huaiyin Power Generation Company Limited was reformed. In order to ensure the steam seal reformation effect,the
influence of the steam seal clearance on the system vibration wasanalyzed. The vibration control measures during unit acceleration and operation were proposed, which can be used as reference for similar units.

Control mode optimization of air preheater of power plant boiler

FANG Hongjuan, YAO Xiuhong

2015, 37(5): 35-36.

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Abstract: The air preheater tripped repeatedly caused by unknown reasons.In order to solve this problem, the frequency converter control cabinet of the air preheater was reformed. The
driving mode of the air preheater was changed.The air preheater is driven by frequency converter in startup process, and then the air preheater is driven by 50 Hz auxiliary power during normal operation.The safe and economical operation of the unit was ensured.

Application of SSS turning gear in feed pump turbine and debugging

DAI Zhigang1, LI Changsong2

2015, 37(5): 37-39.

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Abstract:The structure, the principle and the installation method of the synchroselfshifting ( SSS) clutch type highspeed turning gear were introduced.The interlock protection test and debug method were expounded, which can be used as reference for users to install, debug and use the device.

Analysis on reasons of lower limit action of fuelfeed water crosing restriction of an ultra supercritical unit and treatment

SHAO Changnuan

2015, 37(5): 40-41.

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Abstract:There are exacting requirements about the fuel to feed water ratio and the fuel to air flow ratio for the oncethrough boiler. In its control logic,the crossing restriction circuit may be added to prevent sharp variation of main steam temperature and reheat steam temperature and to prevent instable combustion.The functions of the crossing restriction in control logic were introduced. The reasons of lower limit action of fuelfeed water crosing restriction were analized. Some measures,such as to adopt BTU loop in control logic to amend the total fuel amount and to count the capacity air flow of the mills into the fuel amount timelapse and stepped during mill startup and shutdown,were proposed.

Analysis on reasons of leakage defect of positivepressure directfired system and treatment measures

QI Xiaopan

2015, 37(5): 42-43.

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Abstract:The reasons of leakage defect of positivepressure directfired system of two 660MW coalfired turbine generator units in a power plant were analyzed.The treatment measures for different leakage points were proposed. The leakage defect of the coal pulverizing system was eliminated effectively.

Analysis on reason of fracture of valve stem of turbine HP main valve and repair

XU Jingmin

2015, 37(5): 44-45.

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Abstract: Abnormal openclose phenomenon occurred in main steam valve No. 62 of unit No. 6 in Jiangsu Huadian Yangzhou Power Generation Company Limited.Aming at above problem,based on analysis, it was determined that the main failure occurred in mechanical part of the valve.The valve was disassembled, and it was found that the valve stem was fractured from the root segment in the small spring chamber of the preinlet valve.The reason of fracture of the valve stem of the main steam valve was analyzed, and the relevant countermeasures and repair method were proposed.

Analysis on application of new steam seal clearance measurement technology for steam turbine

CHEN Sheng

2015, 37(5): 46-47.

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Abstract: In steam turbine overhaul duration, the steam seal clearance was measured by medical rubberized fabric or lead wire,and the problems existed in the two methods were introduced. The features of the dummy shaft measuring method and the regulus lead measuring method were analyzed,and the application of these two methods was analyzed with examples.To adopt the two methods can avoid rubbing fault between rotor and steam seal and weaken bearing bush vibration during unit startup and operation after overhaul, and the unit efficiency can be improved.

Analysis on steam flowexcited vibration of steam turbine of an 1 000 MW ultra supercritical unit and treatment

GUO Jie, QIN Xichao

2015, 37(5): 48-49.

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Abstract:In commissioning process of unit No. 4 of Guangdong Yudean Jinghai Power Generation Company Limited, it was found that under high unit load,the vibration of the shafts No. 1 and No. 2 suddenly increased. Considering related vibration parameters, it confirmed that steam flowexcited vibration occurred.In the original valve control logic of the steam turbine DEH system, the main control valve CV4 and the last control valve CV1 were exchanged, so the inlet steam distribution of upper and lower parts of the turbine cylinder was changedand the steam flowexcited vibration was restrained. After adjustment,the vibration of shafts No. 1 and No. 2 is about 40 μm during normal operation, and favorable result was obtained.

Analysis on reasons of ash blockage of boiler air preheater and treatment measure

DUAN Xiaoyun

2015, 37(5): 50-52.

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Abstract:The harm of ash blocage fault of air preheater was introduced. Aiming at the ash blocage fault of air preheater of the boiler No. 2 in Guangzhou Zhongdian Lixin Power Industry Company Limited,the main reasons of the ash blocage fault of air preheater were analyzed. The targeted treatment measures were adopted. The ash blocage fault of the air preheater was solved effectively, and safe,stable and economical operation of the boiler was ensured.

Simulation research on electrohydraulic synchronous control system of tumble gate in ship lift gate bay of Silin

ZHU Jiang, SONG Yuanzhuo, NI Jia

2015, 37(5): 53-54.

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Abstract:The operating of the weak regidity tumble gate in ship lift gate bay of Wujiang Silin Hydropower Station was analyzed.A masterslave electrohydraulic proportional synchronizing circuit with daul hydraulic cylinders was designed.Using AMESim software, a simulation model was established.The feasibility of application of the masterslave daulcylinder synchronous control strategy in the synchronous control of the weak regidity tumble gate was verified by the simulation model.Some suggestions of engineering practice were proposed.

Analysis on faults of multipumps concentrated phase pneumatic ash removal system

HE Zhongcai

2015, 37(5): 55-56.

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Abstract: Taking Liaoning Huadian Tieling Power Generation Company Limited project phase II as example,the composition and operating principle of multipumps concentrated phase pneumatic ash removal system were introduced.The reasons of common faults in blending combustion were analyzed. Relevant suggestions were proposed, which can be used as reference for treatment of similar problems.

Analysis on reason of high fault rate of pneumatic drain valve of steam turbine and treatment

YANG Yuxian

2015, 37(5): 57-58.

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Abstract:Taking the 670 MW supercritical coalfired unit of a company as example, the reason of high fault rate of steam turbine pneumatic drain valve was analyzed.The targeted fault treatment method was given, and preventive measures were proposed. Originally, the faults occurred 16 times in unit startstopduration in average.After the treatment measures were implemented, the faults occurred 2. 5 times in unit startstop durationin average. The treatment result is favorable.

Application of plasma ignition device in lowvolatiles coalfired boiler

ZHOU Yonghui

2015, 37(5): 59-60.

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Abstract:In Sichuan Guang′an Power Generation Company Limited unit No. 34, it was difficult to ignite lowvolatiles coal by ordinary plasma ignitor. Aiming at this problem,a reformation scheme of large power plasma ignition system was proposed. The reformation scheme of the plasma ignition system and the plasma ignition control logic were introduced.The zero fuel oil consumption in boiler starting and shutdown process was realized, and the environmental protection devices were free from oil pollution.

Interface design for ventilation system of S109FA gassteam combined cycle unit

LIU Sheng

2015, 37(5): 61-62.

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Abstract:Taking Hangzhou Huadian Banshan Power Generation Company Limited as example,the features of cooling ventilating system of S109FA heavy gassteam combined cycle unit were introduced. The defects of the original design were analyzed. Based on reference of similar power plants,the measuring elements were installed additionally in air duct. A new supervisory and alarm page was drawn, and relativelogic was modified.Then the realtime monitoring and realtime processing were realized. The favorable result was obtained.

Research on reformation strategy of thermal power plant for “untra clean emissions”

YANG Qingshan, MAO Lingling, ZHAO Hubin, et al.

2015, 37(5): 63-65.

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Abstract: Along with the environmental policy becoming more and more rigorous, the reformation of ultra clean emission in thermal power enterprises is imperative.ltra clean emission in thermal power enterprises is imperative. The feasible technical measures to realize ultra clean emission reformation were introduced as below. In denitration,there are low NOx combustion technology and the low load putting into operation reform scheme. In desulphurization,there are the reformation of capacity extansion and the single tower duoble circulation technology.In dust removal, there are wet electrical dust removal technology and high frequency power supply technology.At last, the hot topics of thermal power enterprises in future were prospected.

Establishment of service power consumption rate model for desulphurization system of power plant based on SPSS

XIA Jinling, SONG Jihu

2015, 37(5): 66-69.

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Abstract:The thermal power plant is a tremendous and complexsystem, which refer to complex related variables. To find the relationship between main control parameters and related variables in enormous database is the difficulty in production of thermal power plants.Taking the desulphurization system as example, using the data analysis software SPSS,the relation between the sevice power consumption rate of the desulphurization system and the unit load and the SO
2 mass concentration in inlet and outlet of the desulphurization system was researched,and a mathematic model was established, which can be used to guide the power plant operation.

Integrated technology to treat poisoned slurry of limestonegypsum WFGD system

YANG Yonglong, SU Qiufeng, WANG Fengji, et al.

2015, 37(5): 70-71.

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Abstract:The reasons of slurry poisoning in wet limestonegypsum desulphurization system were analyzed. Based on experiment, an integrated technology to treat thepoisoned slurry of desulphurization system was proposed. The poisoned slurry can be utilized completely and effectively by this technology.

Application of biological aerated filter and immerged ultrafiltration membrane combined technology

LI Hongxiu

2015, 37(5): 72-73.

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Abstract:In order to use the reclaimed water as the source of make up water of circulating water,it is able to adopt the biological aerated filter and immerged ultrafiltration membrane combined technology as advanced treatment process. The produced water of the treatment process meets the qualitystandard of make up water of circulating water and the boiler make up water. Comparing with other treatment technologies,the process in this paper has advantages of small ccupation of land and low energy consumption, and can used as reference for other power plants in water deficient area.

Analysis on reasons of low boiler efficiency of a 300 MW unit

WANG Chengliang

2015, 37(5): 74-76.

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Abstract:aiming at the problem of lower efficiency of a 300 mw boiler, some experiments were carried out, which include the boiler efficiency test, the draft fan efficiency test,he experiment of air leakage rate of the air preheater, the oxygen meter calibration test and the oxygen fileld calibration test.finally, the reason of lower boiler efficiency is that the indicated value of the oxygen meter in inlet of the air preheater was lower than the true value. The operation oxygen was reduced to 1. 14 % ,the boiler operation efficiency raised by 0. 52 percentage, the house power consumption rate reduced by 0. 34 percentage, and the coal consumption rate reduced by 2. 7 g/( kw· h) .

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