Integrated Intelligent Energy

Analysis on fracture reasons of last fourstage blade of steam turbine and treatment

DUAN Jipeng

2011, 33(2): 1-3.

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The fracture accident of last fourstage blade of the steam turbine in Xinjiang Baicheng Power Plant was occurred again.The reasons of blade fracture were analyzed. The online replacing technology of last fourstage blade with pinned root and concrete requirements were introduced. After the blades were replaced online, the unit operates normally; and the actual effect of the blade replacing technology was obtained.

Application of DAS gland seal in reformation of 600MW steam turbine

LIU Junling;;LI Yongjun;ZHAO Tieying

2011, 33(2): 4-5.

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The reason and purpose of the gland seal reformation of a 600MW unit in Hebi Fenghe Power Generation Company Limited were analyzed. The theory and functions of DAS gland seal and the comparison with other type gland seals were introduced. The improvement of the unit in vibration and heat consumption rate after reformation were compared with those before reformation, and the evaluation of the reformation effects of DAS gland seal was obtained.

Analysis on reasons of bearing vibration of 330MW steam turbine in changeover from single valve mode into sequence valve mode

ZENG Qi

2011, 33(2): 6-7.

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In Urumqi Thermal Power Plant of Huadian Xinjiang Power Generation Corporation Limited, after the operation mode of steam turbine No.1 was changed over from single valve mode into sequence valve mode, the bearing vibration of turbine No.1 in X,Y direction increased to about 200μm, which has a strong impact on unit safety; so the turbine operation mode had to be changed over into single valve mode again. The single valve operation mode causes larger cutoff loss, and the steam rate of the unit will increase, the economical efficiency of the unit will reduce. The open sequence of single valve mode and sequence valve mode was regulated, the unit vibration had been controlled less than 70μm, and the desired effects were obtained. 

Analysis on engineering project of water intake and outlet layout for coastal nuclear power plant

ZHOU Jinquan

2011, 33(2): 8-14.

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In the design of water intake and drainage engineering for coastal nuclear power plants, the influence of multiple aspects, such as the coast stability, the variation of sediment flushing on the seabed, the tide level, the wave, the sediment and the sea creatures in the sea area near the plant, must be considered. Through the engineering project analysis, the optimized scheme between the hydraulic engineering allocation, the structure and the heat dissipation capacity was put forward, and the key points in design of the water intake and drainage project were given. It was pointed out finally that for the water intake and drainage project of coastal nuclear power plant, the engineering scheme must be determined on the base of the technical and economical comparison and argumentation of several schemes, the hydraulic numerical simulation calculation and the physical model experiment. 

Induced draft fan type selection for 2×600MW unit of Tongzi Power Plant

WANG Jie

2011, 33(2): 15-17.

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The feasibility of merging the induced draft fan and the booster fan for desulphurization in 2×600MW unit of Guizhou Huadian Tongzi Power Generation Corporation Limited was analyzed. The fan type selection schemes for merging mode and the two fans separately configuring mode were put forward. The initial costs and the costs of operation and maintenance of the two modes were compared. The type selection of merged fan and the configuring number of induced draft fan were demonstrated. The scheme of merging the induced draft fan and the boost fan for desulphurization was recommended in this project, and the axial fan with adjustable rotor blade was recommended for the merged fan.

Optimization of capacity increasing reformation scheme for desulphurization system of large thermal power generation unit

WANG Yong;WANG Zhidong;PEI Junyuan

2011, 33(2): 18-19.

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The poor quality and varied grades of asfired coal may cause the mass fraction of the sulfur to be much higher than the designed value, which will lead to the desulphurization equipments irregular operating and even to be damaged. In order to raise the adaptability of the desulphurization system for various coal grades, and satisfy the emission requirement of relevant standard when the highsulfur coal is fired, the capacity increasing reformation of the desulphurization system is necessary. The selection and optimization of the reformation technique scheme for the desulphurization system in Huadian Xinxiang Power Generation Corporation Limited were introduced, and the operation effects and the efficiency of the system after reformation were analyzed.

Analysis on electric field of wall bushing for 40.5kV switch cabinet and optimized design

WANG Wenfeng;ZHANG Qingjie;JIANG Liqi

2011, 33(2): 20-21.

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Aiming at the aging of partial insulation and partial discharge of wall bushing for switch cabinet bus, using the finite element analysis software Ansys, the partial electric field distribution was simulated and analyzed. The two structure optimization schemes were put forward, one of them is to increase the inner diameter of the insulation bushing properly, and the other is to reform the rectangular section of the bus into round corner shape. The simulation result shows that the optimized schemes can improve the electric field distribution in the air gap between the bus and the wall bushing and decrease the partial insulation aging of the wall bushing effectively.

Technical reformation of the final reheater of a boiler

LIU Ligang;GUO Jingling;YAN Changyou

2011, 33(2): 22-23.

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The crack and leakage problems of the ‘four pipes’ of boiler No.3 in Heilongjiang Huadian Fulaerji Power Generation Company Limited were analyzed technically. The pipeline design was optimized, and the relevant technical reformation was implemented. The reheater operates safely and reliably.

Reasons analysis and preventive measures on larger opening of normal drainage regulating valve of highpressure heater

BI Yuheng;L Pengfei;NI Guodong

2011, 33(2): 24-26.

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The reasons of larger opening of normal drainage regulating valve of highpressure heater No.1 in 600MW supercritical unit in a power plant were analyzed; and the solving methods and the preventive measures were put forward, which can be used as reference for the highpressure heater operation of other power plants. 

Application of highvoltage variablefrequency speed control device in condensate pump

WU Baohua;LIU Hui

2011, 33(2): 27-29.

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The energysaving theory of variablefrequency speed control device was introduced. Combining with the design parameters and operation conditions of the condensate pump of unit No.1 in SDIC Qujing Power Generation Company Limited, the variablefrequency reformation scheme for the condensate pump was put forward. The comprehensive economical benefit of the reformation of condensate pump was analyzed, and better effects were obtained.

Reformation and optimized operation of speed control system of boiler feed pump turbine

ZHAO Yuzhu;WANG Zhangsheng;XU Houda

2011, 33(2): 30-32.

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The particular case of the micro electro hydraulic control system (MEH) reformation of the boiler feed pump turbine and the fault of difficulty in latchon occurred in operation after the reformation were introduced. According to the experimental analysis, the reasons of the MEH system fault were found out, and the optimizing measures were given, the problems in MEH reformation were solved. 

Application of the three point method for dynamic balance to pulverized coal exhauster

WANG Qingdong

2011, 33(2): 33-34.

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The abrasion of the vane wheel of pulverized coal exhauster in Shandong Bainian Electric Power Development Corporation Limited was not uniform, which caused the larger vibration of the bearing pedestal. The procedure of threepoint method for dynamic balance was introduced. After the balance weight block was added in accordance with the calculation, the vibration of the bearing pedestal was reduced to acceptable value, and which is helpful for safe operation of the pulverized coal exhauster.

Analysis on fault of steam drum water level indicator in initial startup stage and prevention

GU Baoquan

2011, 33(2): 35-36.

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Taking several kinds of steam drum water level indicator frequently used in Heilongjiang Huadian Fulaerji Power Generation Company Limited as the examples, the working theory of the steam drum water level indicators and their common faults in different conditions were analyzed. Combining with the serious consequences caused by abnormal operation of steam drum water level indicator in boiler startup stage, the reasons of its faults were analyzed; the important significance of executing related regulations was expounded; and the preventive measures for enhancing the technical management and institution management were put forward.

Analysis and treatment on a unit tripout accident caused by tripping of generator ground protection

ZHANG Xiaobing

2011, 33(2): 37-37.

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The reasons of a unit tripout accident caused by abnormal melt of the fuse in PT primary side in the generator outlet were analyzed. The defections in the selection of PT primary fuse and in the voltage sampling mode of the protection device were pointed out; the improvement and preventive measures were put forward.

Analysis on reasons of abnormal oil dielectric dissipation factor and the treatments

WANG Hongming;LI Qingchang;SUN Chengjun

2011, 33(2): 38-40.

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The measurement value of the oil dielectric dissipation factor of the Huadian International Zouxian Power Plant has larger dispersibility, and electric discharge phenomena occurred in the measurement. According to the analysis of the collected data, it was determined that the reason of the larger variation of the measured value is the fault in the 2801 type electrical bridge. After the lead column joint of the oil cup of 2801 type electrical bridge was replaced, the measured data of the oil dielectric factor became stable, and the internal electric discharge was solved effectively.

Application of coal blending technology in thermal power plant

XUE Tiezhu;HU Linmao

2011, 33(2): 41-43.

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The theoretical foundation of the coal blending, the common blending modes, the ensuring measures and the requirements of the coal blending were introduced. Aiming at the coal blending scheme for the thermal power plant, some optimization suggestions were put forward, providing reference for coal blending in thermal power plant. 
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Analysis on shortcircuit fault and opencircuit fault of electrostatic precipitator in noload voltage rising test

BO Zunjun

2011, 33(2): 44-45.

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The working theory of the electrostatic precipitator was introduced; based on this, various common kinds of shortcircuit fault and opencircuit fault in noload voltage rising test of the precipitator were expounded. The voltage of the electrostatic precipitator could not rise up to rated voltage due to these faults. The reasons of shortcircuit fault and opencircuit fault were analyzed; the relevant measures were adopted; so the faults were eliminated.

The application of the separated circuit in equipments with uninterruptible power supply

GUO Bochun

2011, 33(2): 46-48.

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The current automatic power supply changeover switch and the redundant standby mode of important equipment were expounded, and their deficiencies in the security and the reliability of the equipments were pointed out. The way to optimize and perfect the circuit design using the separated circuit was put forward, and the security and the reliability of equipments in longterm operation were enhanced by this way.

Characteristics of fuel control system of 600MW supercritical boiler and optimizationQU Qijiu

QU Qijiu

2011, 33(2): 49-52.

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The directfired pulverizing system adopted in a 600MW supercritical unit has larger delay time and inertia. Depending on the quantitative measurement of coal feed rate, the compensating system and the cascade control system, the requirements of boiler operation were satisfied. The problems occurred in operation process were analyzed; some effective measures were adopted, and the operation stability was ensured.

Application of threepoint method for dynamic balancing in largescale fan

FAN Wenbin

2011, 33(2): 53-54.

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The threepoint method is a relatively practical dynamic balancing method for fans. In this method, an identical trial mass will be located in proper sequence on three positions,the angles between two of them are all 120°,for measuring the three vibration values, then the drawing diagram by using the CAD software. The result of the threepoint method can get perfect effect in the site conditions, the calculation and the diagram are accurate, and the vibration amplitude will be reduced less than 0.05mm by using this method.

Analysis of abnormal situation of rotor magnetic pole in 50MW hydroelectric generator

CHAI Fangguang;CHENG Zhenwei

2011, 33(2): 55-57.

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In the overhaul test of rotor of hydroelectric generator No.2 in Hunanzhen Hydropower Station, it was found that the alternating impedance of the magnetic pole was decreased and the power loss was increased. The left and right outlet terminals of pole No.9, the impedance voltage of which was decreased in largest scale, were unfastened, then relevant test was carried out, and the reasons of abnormal situation of the pole were analyzed. One of the reasons is metallic interturn shortcircuit in the pole coil. In addition, the dirt in the pole, in which metal particles were contained, should cause local short magnetic circuit of iron core. It is pointed out that the influence of the indirect short circuit of rotor magnetic circuit on the test data should be considered in test.

Analysis on reasons of electronic weighing coal feeder blockage

LIAN Yinghua

2011, 33(2): 58-59.

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Due to coal jamming, the coal feeder of the Fujian Huadian Kemen Power Generation Corporation Limited had been coerced to shut down repeatedly to clean the coal. It was found by analysis that the reason of the coal feeder blockage is the higher humidity of the asfired coal. The data of the blockage in inlet tube and outlet tube of the coal feeder were compared, and some suggestions on operation were given to ensure the boiler to operate safely and stably.

Application of newtype gland seal in domestic 600MW unit and economic efficiency analysis

FENG Renhai;YU Qiyun

2011, 33(2): 60-61.

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In order to reduce steam leakage loss and increase unit safety and economic efficiency, it is necessary to reform the traditional gland seal using advanced steam sealing technology. The application of the Brandon steam seal on N60016.67/538/538 steam turbine was introduced. The system pipeline was optimized. By comparison of the thermodynamic test result before reformation with that after reformation, it was found that adopting the Brandon steam seal can reduce the heat rate of turbine considerably and enhance the operation economic efficiency of the turbine.
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Perfection of furnace safety supervision system

LI Xinjian

2011, 33(2): 62-65.

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The furnace safety supervision system (FSSS) is one of main protection devices of largescale coalfired units. The imperfection of design of FSSS poses a great threat to the unit safe operation. Combining with the features of main and auxiliary equipments and distributed control system of the combustion system of Weifang Power Generation Company Limited, the control logic design, the signal switchover and the design of the MFT hardware connecting circuit were optimized; so the safety and reliability of the boiler operation had been maximized.

Realization of ‘four furnaces with one tower’ in semidry desulphurization project

QIU Gang;JI Chuanjun;MA Hongliang

2011, 33(2): 66-69.

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The semidry flue gas desulphurization technology with dualcirculating fluidized bed boiler was introduced. Based on this, combining with the practical application example of flue gas suspension desulphurization technology with dualcirculating fluidized bed in the ‘four furnaces with one tower’ flue gas desulphurization system, several key technologies applied in semidry flue gas desulphurization project were expounded. 

Treatment of leakage points of bypass flue in wet flue gas desulphurization system under the condition of it′s without sut up gasgas heater

NIE Pengfei;ZHANG Hongyu

2011, 33(2): 70-73.

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The reasons of leakage of bypass gas flue in the WFGD system without GGH of Hebei Datang International Wangtan Power Generation Company Limited were analyzed. The operation conditions of the bypass gas flue in WFGD system were introduced. According to the requirement of anticorrosion, three anticorrosion schemes were put forward and compared, and an optimal scheme was obtained finally. After the unit had been reformed, the water leakage of the gas flue was eliminated completely. 

Management practice of concessionary operation of flue gas desulphurization

XU Huaibin;YANG Lijun;HU Chuntao;LI Yupeng

2011, 33(2): 74-77.

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Since the desulphurization system of the Inner Mongolia Datang International Tuoketuo Power Generation Company Limited was operated in concessionary mode, by continuous grope and summarizing in practice, the management of the concessionary operation of desulphurization system had been perfected gradually, which ensures safe and stable operation of the desulphurization system. The management manner and the management requirements of the concessionary operation of desulphurization system were introduced, and the advantages and disadvantages of the concessionary operation of desulphurization system were expounded, which provide reference for concessionary operation of desulphurization system of thermal power plant.

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