Integrated Intelligent Energy

Analysis on technologies of onsite assembly welding and sliding installation for large steel track girder

YANG Kaiping;LIANG Guanghui

2011, 33(10): 1-4.

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Taking the installation of steel track girder of 3000kN vertical ship lift for Danjiangkou dam heightening project as example, the problems existing in lifting, sliding installation and onsite assembly welding of large steel track girder were introduced. The concrete construction technical measures were put forward, which can be used as reference for installation of similar large steel track girder.

Design of radial working gate of sand sluicing gate in Caojie navigation and hydropower junction project

LIU Yongsheng;HE Mengyun;JIA Shikai

2011, 33(10): 5-9.

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The working gate of sand sluicing gate of Caojie Navigation and Hydropower Junction Project is extra large type exterior radial gate. The operation condition of the gate is complex. When the water level is the check flood level and the discharge gate is opened fully, the gate bottom edge is in 14.18m below the water surface. The general structure, the design form, the selection of the hoist type and other technical problems of the radial gate were introduced. The experimental research on the flow induced vibration model of the gate structure was carried out, which proved the rationality of the design.

Design of monitoring system for flow of hydraulic turbine

DENG Yaokun

2011, 33(10): 10-12.

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In Hunan Province Nanjindu Hydropower Station, the monitoring system of the bulb tubular hydraulic generator set was replaced by the PLC monitoring system. After this, based on original differtential pressure flow measurement method, various hydraulic parameters were readjusted and recalibrated; a complementary measure for flow calculation was added; the effective flow calculation formulas were established; in the design of programs for analog data collecting, calculating and monitoring, the local PLC control penel and the touch screen of monitor and control general system (MCGS) of the unit were used sufficiently. Finally, the realtime monitoring of flow of the hydraulic turbine was realized.

Engineering practice of manufacturing special shape bifurcated pipe for hydropower station with ultra high water head by using of 15MnNbR vessel steel

YU Jianhua;ZHANG Jinbin;JIANG Jianguo;YUAN Jianhua

2011, 33(10): 13-15.

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The shape features of the steel bifurcated pipe and the weldability of 15MnNbR vessel steel were introduced. The manufacturing process of special shape steel bifurcated pipe suitable to ultra high water head and its quality control strategy were analyzed. The technical difficult points and control countermeasures of manufacturing of steel bifurcated pipe in Duodihe Hydropower Station by using 15MnNbR vessel steel were expounded.

Analysis on reasons of abnormal tripping of 220kV high voltage switch in Changzhou Hydropower Station

YE Ning

2011, 33(10): 16-18.

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The related situations of two times abnormal tripping incidents of 220kV high voltage switch in Changzhou Hydropower Station were introduced. The reasons of abnormal tripping were analyzed. The technical measures and management measures for effectively preventing the abnormal tripping of 220kV high voltage switch were put forward, which ensures that the high voltage switch operates safely and reliably after it was put into operation.

Research on platform of relay protection setting calculation and management for power plant

ZHENG Shouwen;ZHOU Lai

2011, 33(10): 19-21.

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A design scheme of a general platform of relay protection setting calculation and software management for power plant was put forward. In this scheme, the setting calculation will be done facing concrete relay protection devices directly; and the protection devices will be stored in device information database according to their catagories. In setting calculation process, the selfdefined protection setting mode was provided, and the work load of operators can be decreased, which is more in line with the requirement of the practical production. Combing with Power Plant C, the design was analyzed and tested; and it was proved that the design scheme not only has good commonality, but also has fast calculation speed, high accuracy and strong applicability.

Realization of monitoring platform integration for thermal power plant by DCS

PENG Xiaoyan;ZHAO Zhigang

2011, 33(10): 22-24.

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The monitoring platform integration for thermal power plant realized by DCS can lessen the interfaces between the control systems and increase control reliability, and can simplify the management of spare parts and reduce the work load of training and maintenance. The application of DCS in thermal power unit control and auxiliary workshop control was expounded; and the problems in the application were analyzed.

Optimization of lubricating oil system of gear reducer in coal mill

HOU Dongwei;ZHU Yaoxian

2011, 33(10): 25-26.

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The lubricating oil system, which includes the selflubrication oil pump and the lubrication oil cooler, is configured for the gear reducer of the coal mill of 200MW unit in a thermal power plant in Zhengzhou. Due to the operation of the selflubrication oil system of the gear reducer was not stable, the gear reducer was damaged frequently. The gear reducer lubrication oil systems of four coal mills of unit No.2 was optimized and reformed; the lubrication oil stations for mill main bear set were used for providing lubrication and cooling for the gear reducers. The operation reliability of gear reducers of the coal mills in unit No.2 was increased greatly. The optimization scheme can be used as reference for the power plant using similar gear reducer of coal mill.
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Design of hook pulley specially used for 220kV two bundled lines

WEI Shutian;;YU Yang

2011, 33(10): 27-28.

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According to the analysis on overhaul process of 220kV two bendled conductors output line, the technical difficult points existed in current overhaul work were found. A hook pulley, which is specially suitable for overhaul of 220kV two bendled conductors transmission line, was designed; and the problem in overhaul can be better solved by using the pulley.

Comparison of calculation of boiler pressure cylinder strength according to ASME codes with that according to domestic standard

CHEN Zhigang;ZHANG Xu;MAO Fujie;WANG Fang

2011, 33(10): 29-31.

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The strength calculation is important component of steam boikler design. The similarities and differences of the ASME codes volume I and the domestic boiler strength calculation standard, GB/T 9222—2008 “Strength calculation of pressure parts for watertube boiler”, on strength calculation of boiler body were compared and analyzed, which can be used as reference for engineers and technicians.

Frequency domain analysis of rectifier current distribution

XU Lijuan;WANG Zezhong

2011, 33(10): 32-34.

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By onloading voltage in the ANSYS model, the uneven distribution of each harmonic current between different phases and between different branches of the same phase was analyzed. A method to analyze the uneven distribution of the current by calculation in frequency domain was put forward, which provides more simple and effective way to research the current sharing.

Procurement management for EPC lumpsum contract project of domestic electric power design institutes

LI Liang

2011, 33(10): 35-36.

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In order to adapt to changes in the economy, the domestic electric power design institutes develop the EPC contracting business, which provides the experiences and lays foundation for their transformation into engineering company. The procurement is very important link in the implementation process of an EPC contract project. The problem of improvement of procurement process was discussed, and some suggestions were put forward; it is expected that this paper will be helpful for electric power design institutes in procurement of equipments and materials.

Optimized design of circulating water system for reconstructed 2×350MW unit

ZHAO Baibo;WANG Xin

2011, 33(10): 37-41.

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In the reconstructed 2×350MW unit project of Huaneng Jining Power Plant, the preexisting cooling equipment for 2×110MW unit was utilized sufficiently. The cold side parameters of the unit were calculated and optimized. Based on the tendency analysis and the sensitivity analysis, a configuration scheme was put forward, and in this scheme, the annual total operation cost of the unit is most economical. Then the optimization of the unit cold side configuration and the maximizing of operation benefit were realized.

Freeze protection and optimization for indirect air cooling system of 600MW unit

LIU Haijun

2011, 33(10): 42-44.

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In the indirect air cooling unit, the freeze injury of the radiator can cause the equipment damage and shutdown accident, which may lead serious economic loss for power generation enterprise. Starting from three aspects, the freeze protection of the indirect air cooling system was researched and optimized. The corrective measures of operation mode were put forward; some automatic adjustment and control measures were added, which can ensure the safety of radiator of air cooling unit.

Analysis on abnormal chromatograph of insulation oil of main transformer and fault treatment

WANG Baojian;YANG Yongshang

2011, 33(10): 45-47.

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In Huadian Inner Mongolia Energy Corporation Limited, Baotou Power Generation Branch Company, after the B phase main transformer of unit No.2 was put into operation, during the periodical chromatographic analysis of the gas dissolved in the oil, it was found that the volume fraction of the total hydrocarbon was increasing continuously, and the absolute gas generation rate exceeded the warning value. It was judged that there is over temperature fault inside the transformer. The transformer was overhauled many times and had been transported to the manufacturing factory to repair, and the fault was found and eliminated finally; then the safe and stable operation of the transformer was ensured.

Analysis on reason of a power outage accident in 10kV bus

ZHOU Xuan

2011, 33(10): 48-50.

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A power outage accident in a 10kV bus was occurred in a company, and it caused a shutdown accident of the production system of the company. The phenomenon of the accident and the action of the protection devices were introduced. The reason of the accident was analyzed. The characteristics of the power system, the neutral point of which is grounded through a resistor, were expounded. The development tendency of the neutral point grounding mode was pointed out.

Comparison and calibration of two kinds of transformer differential protection

GE Xiaojun

2011, 33(10): 51-53.

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The transformer microcomputer differential protection is very different from the conventional differential protection in their principle and the device structure. And the microcomputer differential protection devices, which are manufactured by different companies, are different from each other; so they must be treated earnestly and respectively in field calibration. The difference of protective principle between the two devices, which are the RCS978, manufactured by Nanjing Nanrui Relay Protection Company Limited, and the CSC326, the product of Beijing Sifang Relay Protection and Automation Company Limited, was compared. Based on this, taking the Y0/Y0/D11 threewinding transformer as example, the calibration step and calibration method of differential protection were introduced.

Optimized reformation of multiring coal feeder

XIE Wujie

2011, 33(10): 54-55.

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Some problems of multiring coal feeder of coal handling system, such as the insufficient output of the coal feeder, the coal leakage and serious wear of travelling wheel and coal bearing platform, were analyzed. Several optimal reformation schemes were put forward. The coal feeder had been reformed, and satisfactory effect was obtained.

Calculation and analysis of auxiliary power consumption rate of thermal power plant

YANG Yiwei

2011, 33(10): 56-57.

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The calculation method of auxiliary power consumption rate of thermal power plant was introduced. The main factors influencing on the auxiliary power consumption rate were analyzed. Some measures for decreasing the auxiliary power consumption rate were put forward, which can be used as reference for thermal power plants to decrease own auxiliary power consumption rate.

Analysis on vacuum problem of condenser of 300MW turboset

PENG Quanyuan;YAN Xianghong

2011, 33(10): 58-59.

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The factors influencing on the vacuum of 300MW turboset were analyzed. Combining with the actual situation of the power plant, the vacuum problem occurred in condensing turbine unit was expounded. The method to enhance the condenser vacuum was found out, providing reference for the persons of the same profesional to handling similar problems.

Optimized reformation of thermal system of 600MW unit for preventing unplanned outage

HE Yang

2011, 33(10): 60-63.

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The hidden dangers existed in each link of thermal system of Jiangsu Guoxin Yangzhou Power Generation Company Limited were investigated. The related control systems, logic and site components were rectified and optimized. The thermal system was perfected. Thus, the possibility of the unplanned outage was decreased; and the safe and stable operation of the unit was ensured.

Analysis on reasons of two times leakage incidents of hydraulic oil system in PG9171E gas turbine

YU Lifan

2011, 33(10): 64-65.

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In Xinjiang Kashgar Emergency Power Station, during debugging and operation of the PG9171E gas turbine, two times leakage incidents were occurred in hydraulic oil system of PG9171E gas turbine. The finding process and treating process of the two leakage incidents were introduced. A conclusion was summarized, which is that when the leakage of the hydraulic oil system was occurred, the auxiliary hydraulic oil pump will start automatically; if the outlet pressure of the hydraulic oil system is lower, then the motor current of auxiliary hydraulic oil pump is smaller and the leakage point is closer to the oil pump outlet. The experience can be used as reference for technicians to treat similar problems.

New method of dynamic debuggiong of fast switching over system before reverse power transmission of main transformer

CHEN Shuqin;ZHANG Xianhui;LIU Hong;LI Xingzhao

2011, 33(10): 66-68.

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Aiming at the suggestion of the dispatch department, in which the reverse power transmission test of the main transformer was not recommended, a new fast switching over system debugging method was designed. By using this method, the dynamic switching over of auxiliary power before the unit starting can be realized; and the correctness of the dynamic switching of the fast switching over system after the unit was put into operation had been increased.

An energysaving measure for 300MW unit by turning off its boost fan under low load condition

YAO Zhongdong;CAO Yongqi;GUO Xusheng

2011, 33(10): 69-71.

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The technical parameters and performances of the induced draft fan and the boost fan were introduced. The feasibility of turning off the boost fan under operation condition was analyzed. As an energysaving measure, the boost fan was turned off, and the desulphurization system was driven by induced draft fan in series mode, and favourable economic benefit was obtained.

Optimized reformation of electrostatic precipitator of 200MW unit

BAI Guogang

2011, 33(10): 72-76.

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The electrostatic precipitator of a 200MW unit was reformed into electrostaticfabric filter. The reason of the reformation was introduced. The comparison and analysis of the device type selection were discussed. The main implementation scheme was described. The working principle and the performance characteristics of the electrostaticfabric filter was analyzed. The operation regulating measures were put forward. The concentration of the dust emission of the unit was decreased, and the economic benefit and the social effect were improved.

Treatment measures of molten core of nuclear reactor

RAN Ke;ZHOU Tao;LI Jingjing

2011, 33(10): 77-81.

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Based on the analysis of the structure features, the heat transfering characteristics of the nuclear reactor molten core and the cooling treatment strategy for the molten core, according to the analysis and comparison of the treanment measures for the molten cores of four type nuclear power plants, which are AP1000, EPR, VVER1000 and the boilingwater reactor in Fukushima, Japan, it was confirmed that to cool and to contain the molten core in a pressure vessel have very important function for mitigating serious accidents. The difference in treatment mode of molten core influences the range of application of reactor unit power in a certain degree. The treatment mode of molten core of new reactor pattern is improved obviously comparing with the previous one. The difference in measures of different reactors for treatment serious accident reflect the difference in design concept of different reactor patterns. The remedial measures of molten core for various reactor patterns were researched in depth, which has important value for ensuring the safety of nuclear power plants.

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