Integrated Intelligent Energy

Study and design of building integrated photovoltaic system for Huadian Industrial Park

YANG Yong，LIU Lei, YU Chao

2013, 35(6): 1-4.

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Abstract:The system scheme and type selection of main equipments of the building integrated photovoltaic project for Huadian Industrial Park were introduced. The key design of the system was analyzed. The emphasis of building integrated photovoltaic system design was put forward.

Prophase investigation and analysis on fuel resource for biomass power plant

LIU Sen

2013, 35(6): 5-9.

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Abstract:The investigation method of prophase investigation on fuel resource for biomass power plant were summarized.The basic situation of the earmarked biomass power plant site and peripheral area and the production and utilization of various biomass fuels were investigated. The cost and economic performance of various biomass fuels were analyzed. The future development tendency of various biomass fuels was predicted.

Design calculation of flue system of distributed energy station

YU Xiuyan

2013, 35(6): 5-13.

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Abstract:The contents of the design calculation for flue system of distributed energy station and the calculation method were analyzed. Combining with practical example, the calculation and analysis were accomplished, and the calculation result was evaluated. The result of this paper provides reference for design of flue system.

Design of array spacing for photovoltaic power station on northern slope area

ZHOU Changyou, YANG Zhiyong, YANG Shengming

2013, 35(6): 14-17.

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Abstract:The photovoltaic array spacing design for largescale aboveground PV power station and housetop PV power station built on northern slope area was studied. Based on the concrete gradient, the terrain and the azimuth angle of buildings, an optimized design of PV array spacing was given. By means of general array spacing calculating formula, the coefficient of sunshine spacing at different latitude of the Northern Hemisphere was calculated. The relation between the field gradient and the PV array spacing was analyzed. The theoretic calculation method of PV array spacing design for northern slope area was deduced. Aiming at similar largescale aboveground power station, a multistep array design method was proposed.

Monitoring of air temperature at inlet and outlet of direct air cooled condenser and optimized design

GUO Jiangang, JIA Jie, TIAN Zhenyu

2013, 35(6): 18-20.

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Abstract:The online temperature field monitoring system for air cooling system was introduced. Aiming at the problems existing in operation of direct air cooled unit, according to the realtime data of temperature field of air cooling system, the energysaving effect of the back pressure set value of the air cooling system was enhanced. Based on this, the design of antifreeze monitoring for the air cooled condenser was optimized. The necessity to measure the air temperature at inlet and outlet of the air cooled condenser by the air cooling temperature field online monitoring device was expounded.

Detection and analysis of driving fault of highvoltage frequency converter

ZHAO Shuwei, ZHANG Yangdi

2013, 35(6): 21-24.

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Abstract:The fault process of the highvoltage frequency converter was introduced. The reasons of the fault were analyzed. The power module monitoring and the master control system were inspected. The fault investigation scheme and the problems needing attention were put forward. The idea of fault investigation in this paper can be used as reference for persons of same profession.

Optimization of coordinated control system of 600MW unit

LI Jian, DAI Xihui

2013, 35(6): 25-29.

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Abstract:The coordinated control system of the 600MW supercritical oncethrough unit of Shanwei Power Plant was analyzed. The load variation rate feedforward loop for the boiler input rate (BIR) had been designed. The steam pressure corrective loop of steam turbine master control was optimized. The control strategy of the boiler master control was adjusted. A more perfect coordinated control scheme was formed. Some problems, such as that the main team pressure fluctuates greatly, there is certain delay for load increase and load decrease, the disturbance of the steam pressure near the inlet of the turbine is too large, the main steam temperature often exceeds the normal and so on, were solved. The test result shows that after the coordinated control system had been optimized, the load response ability and the safe and stable operation level of the unit were improved effectively.

Use vibration gSE spectrum and velocity spectrum to track fault development process of rolling bearing

LIU Mahuo

2013, 35(6): 30-35.

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Abstract:In order to track the fault development process of the rolling bearing, the vibration signal data of the rolling bearing were collected periodically. The signals in different frequency range were processed to obtain gSE spectrum and velocity spectrum. Based on analysis of the gSE spectrum and velocity spectrum obtained in different time, the current status of the bearing was obtained, and the residual lifetime of the bearing can be estimated, which provides scientific data basis for predictive maintenance.

Analysis on fracture failure of highpressure cylinder bolts of gassteam combined cycle project in Guangzhou Zhujiang Power Plant

WANG Longping

2013, 35(6): 36-39.

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Abstract:The failure analysis of fractured bolts of highpressure cylinder of steam turbine No.2 in gassteam combined cycle project of Guangzhou Zhujiang Power Plant was carried out by several tests, which include macroscopic examination, chemical component analysis, mechanical property test, metallographic inspection, energy spectrum analysis, fracture analysis and others. The results show that the bolt failure mode is stress corrosion crack, and the main reason causing the bolt fracture is the shortcircuit and electrodischarge fault of the electrical heater, which caused a pit with stress concentration on the centre hole wall.

Study on power system load prediction method for medium and long term based on comprehensive model

WANG Xiao

2013, 35(6): 40-41.

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Abstract:The load prediction is the base and important premise for power system planning and operation. The principle of the comprehensive model method was introduced. A new comprehensive prediction model was established, and using the variance reciprocal method, the weighting coefficients of each single model were determined. The analysis of calculation examples shows that the prediction precision of the comprehensive model method is higher than the prediction precisions of each single model method.

Quality control for establishment of technical standard systematic frame of AP1000 construction and commissioning

CHEN Qixia

2013, 35(6): 42-44.

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Abstract:The factors influencing on quality of technical standard systematic frame of AP1000 construction and commissioning were analyzed. According to the analysis result, the quality control objects in the establishment process of the technical standard systematic frame were determined. Some concrete quality control measures were formulated, and the scientificalness and applicability of the technical standard systematic frame were ensured.

Application of mobile twodimensional barcode in management of spare parts of electrical secondary devices

YANG Jinfei, LIN Zhen, YE Wei, CHEN Xuyan, ZHOU Guoqing

2013, 35(6): 45-46.

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Abstract:The hardware fault rate of electrical secondary devices is higher, and the spare parts management is not perfect, so to find the suitable circuit boards needed for site repair immediately is more difficult and the defects of the devices can not be eliminated quickly. Aiming at this problem, a new management method of spare parts by mobile twodimensional barcode technology was put forward, which is helpful for eliminating device defects quickly.

Analysis on asynchronism of secondary auxiliary switch of independent phase operated breaker with 220kV and above voltage grade

NING Nan

2013, 35(6): 47-49.

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Abstract:There is asynchronism problem in secondary auxiliary switch of independent phase operated breaker with 220kV and above voltage grade, which influences on safe and stable operation of power grid certainly. But there are not relevant rules on this problem in current technical specifications of breaker with 220kV and above voltage grade. Taking an abnormal incident as example, the reasons of asynchronism of breaker secondary auxiliary switch were analyzed, and the influence of this problem on power grid was expounded.

Analysis on reasons of reactive power fluctuation of generator

TAN Weisheng

2013, 35(6): 50-53.

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Abstract:The reactive power of generator No.1 of Guangdong Yudean Yunhe Power Generation Company Limited fluctuated abnormally multiple times. The factors leading the reactive power of the generator to fluctuate were pointed out. According to analysis, it was decided finally that the main reason of the reactive power fluctuation of the generator No.1 is transient fault of the excitation voltage transformer of the generator excitation system. The excitation voltage transformer of the generator No.1 had been replaced, and the fault of reactive power fluctuation was eliminated.

Analysis on reasons of 6kV bus power failure and preventive measures

MA Hongchao，WU Qian

2013, 35(6): 54-55.

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Abstract:Taking the 300MW unit of China Resources (Henan) Power Gucheng Company Limited as example, the reasons of power failure accidents on 6kV bus IB segment were analyzed. Some concrete preventive measures were put forward, which provides reference for related personnel.

Optimization of water feed mode for boiler of 300MW unit in startup stage

YAN Xiaosheng

2013, 35(6): 56-57.

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Abstract:The advantages and disadvantages of three different water feed modes of the 300MW unit in a power plant in startup stage were analyzed. The operating process of water feed mode of turbinedriven feed pump assisted by electric feed pump was introduced, and the matters needing attention in operation were summarized. After the optimization, the reliability and economic efficiency of unit startup were improved.

Analysis on perforation by strike corrosion of condenser copper pipe and membraneplating protective treatment

FU Dongmiao1, HUANG Xiaochun2

2013, 35(6): 58-60.

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Abstract:Taking 2×300MW generator set of Shenhua Shenwan Anqing Wanjiang Power Generation Company Limited as example, the perforation problem of condenser copper pipes by silt strike was analyzed. The membraneplating method was adopted to treat the condenser copper pipes, and better effects were obtained.

Treatment of fail of remote turbine latch operation by control and protection system

DONG Qisheng, YAN Yun

2013, 35(6): 61-62.

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Abstract:Combining with the latch principle by the control and protection system and the structure features of the emergency stop slide valve, the reason of the fail of remote turbine latch operation was analyzed. As a temporary treatment scheme, the oil input restriction orifice of the latch solenoid valve had been replaced, and the fault was eliminated. It was ensured that the unit commissioning can go on successfully before the problem had been solved thoroughly,will lapping face and seal surface，which is waiting for some necessary conditions.

Analysis on reason of fuse fault in F-C circuit and treatment measures

WANG Jiqiang, SHAO Hua, YANG Jun

2013, 35(6): 63-64.

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Abstract:The characteristics and working principle of the F-C switch circuit constituted by highvoltage currentlimited fuse and highvoltage vacuum contactor were introduced. Taking the fuse fault of F-C switch circuit of a highvoltage motor in coal conveying belt system of a power plant as example, according to analysis, it was determined that the fault reason is poor fault signal transmission between F-C switch circuit protection device and upper computer of DCS , which caused the belt motor current overload accident. Concrete treatment measures were put forward, and the safe operation of the equipment was ensured.

The risk management research on the EPC international hydropower projects

TIAN Binqiang1,ZHOU Yong2,CHEN Qianwen1,XU Jifei1,MA Ming1

2013, 35(6): 65-68.

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Abstract:Starting with the characteristics of the risk management of the international EPC hydropower projects in combination with the risk management practice of a hydropower project in Cameroon, the writer describes the risk management in three aspects, namely the risk identification & analysis, risk assessment and risk management strategies. The writer builds the WBS model and risk level analysis model for an international EPC hydropower project with his own characteristics. The risks are identified according to the models that are built. The AHP analysis method is adopted for the weight calculations. The fuzzy comprehensive evaluation (FCE) is also applied to the assessment of the risk effect. According to the above research the writer puts forward “the risk management strategies and risk responses system” for an international EPC hydropower project. By doing so, the writer provides the Chinese EPC contractors references on the risk management of the international EPC hydropower projects.

The heat rate consumption impacting on economic for the BOT thermal power oversea projects

YANG Mancheng,CHEN Wei

2013, 35(6): 69-71.

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Abstract:The factors were analyzed through the heat rate for the two Indonesia BOT thermal power projects related about affecting investment on the project . It was revealed that fuel payments and unit performance test of the grid power purchase agreement(PPA) signed by the company, which heat rate consumption, the actual coal consumption and the efficiency of the units are closely related to.During the design, supervision, construction, commissioning, operation stages and so on, the process was well controlled with the heat rate in the final, in order to ensure the safety of funds for the foreign investment, and then gain maximum benefits.

Economic optimization of auxiliary system of supercritical aircooled unit

TANG Guangtong, LI Changsong, NAN Weiliang

2013, 35(6): 72-75.

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Abstract:Aiming at the features of auxiliary system of the supercritical aircooled unit in a power plant, the design and operation of main auxiliary system of the unit were optimized and improved, and the economic efficiency of the unit was increased. The results of this paper provide reference for similar unit in design and operation.

Study on numerical simulation of flow field of desulphurization absorption tower in wet FGD system

CHEN Anxin, ZHANG Junmei, GAI Dongfei

2013, 35(6): 76-79.

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Abstract:The absorption tower design is key technology for realization of localization and independence of the wet FGD technology. Using software Pro/Engineering, the empty tower model of absorption tower was established. Using the computational fluid dynamics software Ansys CFX, the gaseous phase dynamic flow field in absorption tower was simulated. The influence of different outlet forms of absorption tower on its performance was discussed and compared, and the distribution of the pressure and the vector velocity in tower were compared, which provide some guidance for subsequent simulation and optimization of flow field in absorption tower.

Design of waste heat utilizing system for cooling circulating water of air compressors

LUO Haihua

2013, 35(6): 80-81.

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Abstract:The conventional cooling mode of the air compressor of a power plant and the air compressor system of the whole plant were introduced. Combining with the actual situation of the plant, the waste heat utilization scheme of cooling circulating water for the air compressors and economic performance of the system design were analyzed. A design idea was proposed, in which the cooling tower will be replaced by plate heat exchanger to cool the lubricant oil of the air compressors.

Study on application of energysaving and emission reducing technology in electrostatic precipitator of 630MW coalfired unit

JIAO Guofeng, LI Shiguo

2013, 35(6): 82-84.

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Abstract:The dust emission concentration of electrostatic precipitators of most domestic coalfired units is larger and can not meet the requirement of the newest state standard of air pollutants emission. Taking the energy saving and emission reducing technology by high frequency power source for electrostatic precipitator of Yangzhou Second Power Generation Company Limited as example, the practical energy saving and emission reducing effects of the company were introduced. The feasibility of electrostatic precipitator of coalfired unit to realize energy conservation and emission reduction was analyzed. The upgrade and reformation scheme of electrostatic precipitator and suggestions were put forward.

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