Integrated Intelligent Energy

Application of field bus control technology in water treatment center of fossil fuel power plant

WU Zhiyong;LI Hongyan

2012, 34(12): 1-5.

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Taking 2×330MW direct air cooled unit as an example, the general layout and the overview of the building design of the power plant water, the water source and the water treatment center were introduced. The feasibility to adopt the field bus technology in the water treatment center was analyzed. By adopting the field bus control technology in the water treatment center, the transmitted information is changed from analog signals into digital signals, the devices have functions of intelligent diagnosis and predictive maintenance, and the digital control of the water treatment center is realized. Using the technical advantages of the field bus control technology fully, such as the fewer occupied area caused by centralized control, the lower investment and the higher safety and reliability, the operation and management level of the water treatment center are improved greatly.

New criteria suitable for overcurrent protection of highvoltage motor

YU Jiandong

2012, 34(12): 6-8.

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The overcurrent protection adopted in domestic motor protection at present was introduced, and it is considered that the criteria of the protection can not meet the requirement of user safety production. According to the analysis of the motor current characteristics, a new overcurrent protection logic criterion with negative sequence current latch was proposed and verified by practical example.

Research on static and dynamic characteristics of tail water emergency gate of pumped storage power station

HUANG Jun;XIE Zhixiong

2012, 34(12): 9-11.

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The static and dynamic characteristics of the tail water emergency gate structure of a pumped storage power station were researched numerically by use of the software ANSYS. The fixed wheel reacting force under two connection forms of the two gate sections, the stress and the displacement of various parts of the gate, the buckling stability and the frequency and type of the gate natural vibration were calculated and analyzed. The results of this paper provide technical basis for selecting the final design scheme of the gate structure, which can be used as reference for design and calculation of the similar gate structure.

Design of 4500kN inclinedpulled twoway gantry crane of Sanmenxia Water Control Project

TANG Songzhi;ZHAO Zhongying;ZHU Junxue

2012, 34(12): 12-14.

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The main structure and technical parameters of the 4500kN inclinedpulled twoway gantry crane of Sanmenxia Water Control Project were introduced. The main trolley hoisting mechanism, the load limiter, the trolley driving mechanism, the crane travelling mechanism and the design and arrangement of the gantry were expounded. The test data of the gantry crane all accord with the requirement of relevant standards.
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Analysis on flow field characteristics of direct air cooling unit based on computational fluid dynamics software

SUN Qide;;MA Ying

2012, 34(12): 15-17.

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Aiming at the larger influence of the environment factors on the direct air cooled unit, taking the 300MW direct air cooled unit of a power plant as an example, using the numerical simulation method, the computational model of the air cooled condenser unit was established. And further, the law of the influence of environmental factors on the flow field of condenser unit was found. The relation between the heat transfer efficiency of the air cooled condenser and the environmental factors was studied quantitatively. The result in this paper can provide numerical reference for optimized design and economical and safe operation of the condenser.

Design and optimization of siphon well arrangement scheme of oncethrough cooling water system in power plant

CHEN Fushan;SUN Haiyan;ChenYunhuai

2012, 34(12): 18-20.

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In the oncethrough cooling water system of power plant, the siphon well plays important role. The rationality of the siphon well design scheme influences on the safety of the system operation greatly. Under the extreme condition of the hydraulic transient process, combining with the practical project example of the YH Power Plant, the influence of the siphon well arrangement scheme on the safety of system operation was analyzed. The improvement measures of the arrangement scheme were proposed, and the general design principle of siphon well arrangement scheme was summarized.

Research on key technologies for intelligent reformation of traditional hydropower stations based on standard IEC 61850

LI Zhongming;PANG Min;YUAN Kejun;NI Weidong;GAO Zhiyong

2012, 34(12): 21-24.

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The intelligent reformation of the domestic traditional hydropower stations is an inevitable development trend. The intelligent hydropower station must use the unified hydropower station model to realize data exchange on integrated platform based on the standard IEC 61850. Based on analysis of current situation of the traditional hydropower stations, the feasible system framework for intelligent reformation of traditional hydropower stations, the equipment modeling method for hydropower stations based on the standard IEC 61850 and the software structure of the intelligent communication server, which will be used to realize IEC 61850 communication with the master station, were proposed. The future intelligent reformation of hydropower stations was discussed.

Analysis on accident of asynchronous connection of generator into grid and treatment countermeasures

ZHAO Shengli;YAN Hongjian

2012, 34(12): 25-26.

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Taking the generator set of Hunan Valin Lianyuan Iron and Steel Company Limited as an example, an accident of generator stator winding overburning, which is caused by that the generator outlet switch switched on in delay time, the generator had been connected into the grid asynchronously. The reasons of the accident were analyzed, and the targeted treatment method was given, which provides reference for handling similar problems.

Analysis and optimization of design of cable main tray based on cable laying software

LIU Qing;CHEN Zhiqiang

2012, 34(12): 27-31.

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A new design and optimization method of cable main tray of thermal power plant was introduced. The cable path table, which is created by the software ‘SDEPCT power plant thermal control cable digital wiring’, will be used to analyze the cable tray capacity of each layer of the 2×300MW unit in Xinjiang Hefeng Power Plant. The optimized scheme of cable tray design was put forward. The method provides the data basis for cable main tray design, which can be used as reference for standardization of cable main tray design of similar units.

Analysis on design and operation of condensate polishing system of Ling’ao Nuclear Power Station project phase II

SHEN Jianyong;YANG Mancheng;WANG Zhengping

2012, 34(12): 32-35.

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The design features of the condensate polishing system of units in Ling’ao Nuclear Power Station project phase II were summarized. The operation situation of the system after putting into operation successfully was analyzed. The application feedback information was presented. The system has advantages of the rational design, the safe and stable operation and the technology and devices with selfowned intellectual property rights. The defects in previous design and type selection were solved, which provides reference for design of condensate polishing system in subsequent nuclear power stations.

Analysis on reason of accident of Heller indirect aircooling system and treatment

WU Henggang;WANG Zhong’ao;LU Xudong

2012, 34(12): 36-37.

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Taking the 660MW indirect aircooled unit in a power plant as an example, the two accidents of aircooling system occurred in system operation were analyzed. The operation characteristics and matters needing attention of the indirect aircooling system were expounded. The measures were given when the circulating pump of the indirect aircooling system had tripped or the circulating water had been cut off, and the safety of the unit operation was improved.

Influence of quality of EH fireresistant oil on unit safe operation

ZANG Xudong

2012, 34(12): 38-41.

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In the load reducing process of unit No.11 of Wangting Power Plant, the highpressure governing valve closed suddenly, which caused that the water level in steam drum rose and the main fuel protection tripped (MFT) finally. It was determined by analysis that the reason caused the high pressure governing valve to be closed suddenly as following，the gap and the porthole of the MOOG valve were blocked by the pollutant in the EH oil system and the valve was malfunctioned. The governing features of the water level in the steam drum of drum boiler and the matters needing attention in the operation were put forward, which is helpful for avoiding unplanned outage and improving safety and reliability of the unit.

Analysis on reason of load fluctuation of turbine hydraulic control system and treatment

LI Dongqin

2012, 34(12): 42-45.

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The reasons of load fluctuation of turbine hydraulic control system were analyzed. The relevant measures were adopted. The factors influencing on the load fluctuation of the control system were eliminated, and the operation stability of the control system was improved.

Analysis on rotor grounding fault of 390H generator and treatment

WANG Zhongming;GUO Weijun;ZHANG Zhenguo

2012, 34(12): 46-48.

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The rotor of 390H generator and matched grounding protection device were introduced. The process of a rotor grounding fault and the fault inspection and treatment were expounded. The reasons of the fault were analyzed. The test method of the rotor grounding fault and preventive measures were put forward.
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Heatsupply reformation of 335MW straight condensing unit in Zouxian Power Plant

WANG Xiaozhu;LI Xiangling;DUANMU Yanfeng;WANG Shuchun;ZHAO Xinpu;JIANG Shoukun;LI Shuguang

2012, 34(12): 49-50.

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In order to satisfy the heating demands of the Zoucheng city, the 2×335MW straight condensing unit of Zouxian Power Plant was reformed into heat supplying unit. The steam extraction for heatsupply is led out from the steamguide tube between medium pressure cylinder and low pressure cylinder to the initial station of heat supply network. The initial station of heat supply network was built in plant area and connected with the heat supply piping network of Zoucheng city through the heat supply piping new built in plant area. After the reformation, favorable social effects and economical benefit were obtained.

Analysis on reasons causing highpressure bypass governor valve of M701F unit to be unable to close

BAI Binjie

2012, 34(12): 51-53.

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Combining with the bypass logic action behavior of the Mitsubishi gassteam combined cycle unit, the problem of the highpressure bypass governor valve of the M701F unit, which could not be closed normally during the unit startup process, was expounded. The problems were analyzed. The solution was given, and similar trouble was avoided.

Repair and analysis of outlet terminal overheat of 500kV high voltage bushing

WANG Fuzheng;ZHANG Qingping

2012, 34(12): 54-55.

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Aiming at the overheat defect existing in the outlet terminal of 500kV high voltage insulating bushing of Huadian International Zouxian Power Plant, the reasons of the overheat fault were analyzed, and the treatment process was introduced, which provides reference for treatment of similar problems.

Analysis on tripping of main transformer differential protection caused by fault in cross point of lines

ZHU Shaotang

2012, 34(12): 56-57.

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A breakdown accident occurred in the cross point of the 110kV line and the 35kV line of a substation and caused that the main transformer differential protection skiplevel tripped, a grounding fault occurred in the outside B phase and a lightning arrester breakdown accident occurred in internal C phase. Combining with the tripping report and the waveform, using the fault sequence component analysis method, the reasons of the accident were analyzed, and the improvement scheme was proposed to prevent similar accident.

Reason analysis and treatment of high acid and alkali consumptions of first stage desalinization equipment

DENG Ying

2012, 34(12): 58-60.

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The reasons of higher acid and alkali consumptions of first stage desalinization equipment in Sichuan Guang’an Power Generation Company Limited project phase I were analyzed. The concrete regulating measures were proposed, and the optimal resin regeneration process was formulated. After the regulation, the acid and alkali consumption of the desalinization system for anion exchange resin and cation exchange resin regeneration decreased obviously, and the economic efficiency of the resin regeneration of desalinization system was increased.

Offline detection method of temperature characteristics of SiC deexcitation resistor

FU Yu

2012, 34(12): 61-63.

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The SiC deexcitation resistor is constituted by multiple SiC resistor chips connected in serialparallel mode. Their current equalizing and energy equalizing performances can be examined by temperature characteristics. Aiming at the temperature characteristics of current SiC deexcitation resistors, a new offlinedetection method was proposed. The new method is economical, practical, safe and simple.

Analysis on safety margin for selection of components of belt coal conveyer in power plant

LIU Tianjun;WANG Libo

2012, 34(12): 64-64.

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According to the application situation of the belt coal conveyer in power plants for the past few years, combining with the operation data of the belt coal conveyers of multiple power plants and the damage of the conveyers, the matching attribute of the component type selection was analyzed theoretically. Some suggestions about the selection of belt type and the driving power of the belt conveyer were given, which provide reference for belt coal conveyer design.

Recovery and reuse of metal oxide in waste denitration catalyst

REN Zhen;CONG Xiaorong

2012, 34(12): 65-67.

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The type and main components of the catalysts used in SCR denitration process were introduced. The recovery method of the metal oxide in the waste catalyst was analyzed. The economic benefit of recovery of waste catalyst was estimated.

Index system for environmental impact assessment of new energy power generation project plan

SHEN Zhiwei

2012, 34(12): 68-70.

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Based on the characteristics of environmental impact of new energy power generation project, combining with the research idea and method of environmental impact assessment of traditional energy power generation project plan, the main environmental impact factors of new energy power generation project plan were selected, and the index system for environmental impact assessment of new energy power generation project plan was established.

Analysis on feasibility of application of leasing and power costrepaying mode in solar energy utilization

LI Qi;WU Xiaoli

2012, 34(12): 71-73.

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The bottleneck encountered in popularization of solar energy utilization was analyzed. A solution based on leasing and power costrepaying mode was proposed. Combining with practical examples, the economic rationality of the solution was analyzed. The problems may occur in the application of the mode were improved. The development prospect of the mode was forecasted.

Research on multifunctional safety monitoring and fault diagnosing system for wind power generation set

CHI Jifeng;LIU Xiaoguang

2012, 34(12): 74-78.

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A multifunctional safety monitoring and fault diagnosing system for wind power generation set was developed. Using the developed system, it is able to carry out the predictive maintenance of the condition of wind turbine drive system, to prevent the secondary fault of the equipment and to reduce the economic losses caused by accidental shutdown. The system is helpful for improvement of modern management level of the wind farm. Other than vibration monitoring of the drive system and the fault diagnosis, the safety monitoring and fault diagnosing system can monitor open flame and smog caused by electric short circuit inside the cabin and can monitor the realtime surface temperature of the devices. The system has functions of video monitoring, voice interaction and radio frequency identification (RFID), which is useful for effective management of the maintenance of wind farms and improvement of the office automation level of wind farms.

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