Integrated Intelligent Energy

Computerization model for converting offline dew point of generator into hydrogen pressure dew point and its optimization

GUAN Dachun

2012, 34(1): 1-3.

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The method to calculate the dew point of generator under its operation hydrogen pressure by using its offline dew point data was introduced. The formula was established in the software Excel table. The calculation result can be displayed in the table as soon as the data was input into the table. The repeatedly table lookup and calculating processes, which is recommended in the file DL/T 651—1998 “ Requirements for hydrogen humidity of generators using hydrogen as a coolant ”appendix A, can be avoided. The calculation scope can be extended to calculate the absolute humidity and the relative humidity of the hydrogen; and the result can be optimized into monthly report, which is convenient for statistics.
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Influence of environment temperature variation on measurement accuracy of clearance of generator sealing bush

ZHANG Hong;ZHANG Xiaonan

2012, 34(1): 4-5.

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The measured value of the clearance of generator sealing bush will change due to the variation of the environment temperature. Based on theoretical analysis, a calculating method for correcting the radial clearance value was put forward. By using this method, the error existed in measurement process can be decreased further. This method is active function for increase the measurement accuracy and ensuring safe and economical operation of the equipment.

Analysis on reasons of oil hammer in generator seal oil system and countermeasures

MU Xiaojing

2012, 34(1): 6-9.

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In 2×600MW hydrogencooled unit of Huaneng Tongchuan Power Plant, the singlering seal oil system is adopted. In this system, the phenomenon of oil hammer, which is similar to the water hammer, occurred many times; and large fluctuation of the outlet pressure of seal oil pump and the pressure difference of oil and hydrogen occurred in the same frequency. The reasons of the faults were analyzed; and some improvement measures were put forward.

Analysis on reasons of incorrect tripping of excitationloss protection section III of generator and preventive measures

WANG Shaoping

2012, 34(1): 10-11.

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The incorrect tripping accident of the excitationloss protection section III for the generator was occurred frequently. The reasons of the incorrect tripping of the excitationloss protection section III of the generator were analyzed. According the analysis, the reason of the incorrect tripping of excitationloss protection is that the operation mode of the unit primary system had been changed, but the binary input connection of excitation loss protection section III did not be modified relevantly. The measures to prevent incorrect tripping of excitationloss protection were put forward, which are helpful for ensuring the safe operation of the devices.

Diagnosis of contacts loosening fault of onload tap changer based on EEMD

HONG Xiang;MA Hongzhong;GAO Peng;CHEN Kai;WANG Chunning

2012, 34(1): 12-15.

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Aiming at the mode mixing problem, which is exists in the vibration signal fault detection for transformer onload tap changer (OLTC) using HilbertHuang transform (HHT) based on empirical mode decomposition (EMD), the ensemble empirical mode decomposition (EEMD) method was put forward; and the mode mixing problem of EMD had been proved effectively. Based on the EEDM, the vibration signal can be HilbertHuang transformed; the marginal spectrum can be drawn from the HHT result; then the detection of the contacts loosening fault can be realized. The simulation and practical experiment show that to use this method in analysis of vibration signal of the tap changer can draw the values of the fault characteristic parameters effectively; and this is useful for contacts fault diagnosis.
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Analysis on typical layout of circular stockyard

LI Yu;CHEN Mingyu

2012, 34(1): 16-18.

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The circular stockyard, which has advantages of advanced and perfect technique, high automation extent, pollutionfree, high safety and reliability, is used widely. The main composition and the loading and unloading process of the circular stockyard were expounded. Taking a project as example, the plane layout of the circular stockyard and its loading/unloading capability were introduced.
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Optimized realtime unit load distribution system based on double layers increment dynamic planning method

XU Shiyuan

2012, 34(1): 19-23.

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The optimized load distribution model between units of Fujian Mianhuatan Hydropower Development Company Limited, which is based on the double layers increment dynamic planning method, was introduced. An objectoriented programming frame was established. An application software system, which is highly configurable, powerful and easy to use, was developed. The application software system had been used practically in power generation dispatch, and obvious economic benefit was obtained.

Design and application of synchronizing circuit under 3/2 connection mode

ZHANG Qiong

2012, 34(1): 24-27.

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The design requirement and application situation of the synchronizing circuit under 3/2 connection mode were expounded, in which the synchronization control circuit design, the synchronization AC voltage loop design and the synchronization check test of large generator set under 3/2 connection mode were included. The purpose of this paper is to ensure the synchronizing operation of the units under 3/2 connection mode to be more rational, perfect and security.

An approach for eliminating accumulative error of SOE module in DCS

WU Shenghua;TIAN Haibo

2012, 34(1): 28-29.

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Due to the influence of the temperature, the excitation level and other instability factors on the frequency of the clock oscillator, it is difficult to avoid the error of the system clock. Because of the complexity of the program, this influence is continuous and random; and it is difficult to eliminate this influence in short time. A realistic corrective method for the accumulative error of analog clock of SOE module in DCS was put forward and analyzed in detail. The method can reduce the accumulative error and enhance the accuracy significantly.

Optimization of thermal control system design for newlybuilt thermal power plant and its application

WEI Xia;LIU Bo

2012, 34(1): 30-32.

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The design of thermal control system for thermal power plant is rational or not rational, that is important factor not only influencing on unit installation and debugging, but also influencing on safety, stability and economic efficiency of the unit operation. The design experiences of thermal control system for 2×330MW heat and power cogeneration project of Huadian Xinjiang Urumqi Power Plant were introduced. Some typical problems were analyzed, and relevant solving methods were put forward.
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Analysis on reformation of steam purge system of gasgas heater

GUO Haojie;SONG Haiyan

2012, 34(1): 33-35.

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The mechanism of blockage of GGH was introduced. The reformation method of GGH steam purge system of Wangting Power Plant was analyzed. The effect of the reformation was evaluated. It was proved that to increase the steam purge temperature and to use the upper and bottom soot blowers simultaneously can improve the blockage of GGH obviously, which can be used as reference for improvement of GGH blockage.

Selection and application of fuel crushing equipment for CFB boiler

ZHANG Xingshun;XING Jin;TANG Tao

2012, 34(1): 36-37.

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The fuel crushing equipment is important auxiliary equipment for CFB boiler to ensure its safe and stable operation. The crushing theory and the requirement of CFB boiler about the fuel were introduced. The current situation of the fuel crushing system of CFB boiler was analyzed. The optimized selection and application measures of the fuel crushing equipment were put forward.

Optimization of main steam temperature automatic control for supercritical unit

DU Zhiqiang;LI Diyong;JIANG Huabin

2012, 34(1): 38-40.

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Since the domestic 600MW supercritical unit was put into operation, its operation is not so stable, and unplanned outage was happened many times. The current situation of automatic control of the supercritical unit was analyzed. Aiming at automatic adjustment of main steam temperature, some improvement suggestions were put forward, which causes the control of main steam temperature to be more fast and accurate, and the operation reliability and safety of the supercritical unit were increased.

Repair welding measures of cracks on diaphragm of steam turbine lowpressure cylinder

YANG Zhanjun;WANG Lipeng

2012, 34(1): 41-42.

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During overhaul of steam turbine No.2 of a power plant, it was found that there is an about 35mm surface crack in sixth stage diaphragm of the lowpressure cylinder, which influences on unit safe operation directly. According to comprehensive analysis of the material of the diaphragm, it was decided to repair the defect by dig grinding and patch weld, and to adopt the cold welding method for the patch weld. The patch weld process, the preparing work, the preventive measures and the inspect method were introduced. The repaired diaphragm had operated for an overhaul period, and there was not new defect occurred in the patch welded position. This shows that the patch weld technology can ensure safe operation of the repaired diaphragm completely.

Chemical cleaning technology of continuous electrodeionization module

TAN Mingde;HUANG Wei

2012, 34(1): 43-46.

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After the continuous electrodeionization modules of Huaneng Henan Zhongyuan Gas Power Generation Company Limited operated for 4 years, the resistivity of the produced water decreased to 5MΩ·cm, and the mass concentration of SiO2 in the produced water increased to 120μg/L, so the produced water can not meet the production requirement already. Using the mixed liquids of 1.8%HCl，1.0%NaOH and 5.0%NaCl, the electrodeionization modules were cleaned respectively. Through debugging for several days, the function of the modules returned to normal; and the resistivity of produced water of the electrodeionization modules No.1 and No.2 increased to 18.26MΩ·cm and 17.30MΩ·cm respectively, which are very ideal results.

Study on the speed regulation characteristics of Voith R16K-550 hydraulic coupling

YAN Chuanwu;WANG Zhangsheng

2012, 34(1): 47-48.

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Based on the structure of Voith R16K-550 hydraulic coupling, its speed regulation principle was related. By the testing for spoon pipe opening, feed water pump rotation speed and outlet flow of boiler feed pump (BFP) A of technical innovation project in Ningxia Guodian Shizuishan Power Plant unit 1, the speed regulation characteristics of hydraulic coupling were acquired, and the BFP automatic control quality has been improved.
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Optimization and implementation of technical reformation scheme for electric actuator

NI Ping

2012, 34(1): 49-50.

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The faults of the electric actuators used in Baotou Power Generation Branch of Huadian Inner Mongolia Energy Company Limited were occurred frequently, which reduce the equipment reliability greatly; and the optimal control effect can not be obtained. The electric actuators for the inlet gas baffle of air preheater, the electric actuators for the attemperating water adjusting valve of the boiler superheater and the electric actuators for the butterfly valve of water circulating system all were transformed into split type electric actuators. The reliability of the reformed electric actuators was increased greatly; the hidden danger of the equipments was eliminated thoroughly; the maintenance cost was decreased; and the favorable effect was obtained.

Analysis and adjustment strategy of the flameout of 300MW tower type boiler

YAO Zhongdong

2012, 34(1): 51-53.

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The reason of flameout of the 300MW tower type boiler in Yaomeng Power Generation Company Limited was analyzed. Based on the coldstate kinetic field experiment and targeted combustion adjustment experiment, the origin of the problem was found. According to the actual situation of the power plant, a rational operation adjustment scheme and preventive measures were put forward. The practical result shows that the boiler combustion condition was improved obviously, and the flameout fault does not occur again.

Analysis on wrong shutdown accident caused by oil level measurement of main oil tank

WANG Linhui

2012, 34(1): 54-56.

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The lubrication oil system of the unit was introduced. Based on this, a wrong shutdown accident caused by oil level measurement of main oil tank was analyzed. The fault had been inspected. A treatment scheme was put forward; and the accident does not occur again.
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Analysis on dry and wet states transition process of 600MW supercritical unit

WANG Hongliang;WANG Guoqing

2012, 34(1): 57-58.

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In order to increase the safety and stability of the dry and wet states transition process of supercritical unit, the reasons of accident shutdown, which had happened in dry and wet states transition process of a 600MW supercritical unit, were analyzed; and it is considered that the main reason caused the accident is maladjustment of the watercoal ratio. In dry and wet states transition process, must pay attention to adjust the watercoal ratio to ensure the stability of pressure and temperature of main steam.
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Analysis on reasons of tube cracking and leakage of economizer of supercritical oncethrough boiler

MA Shidong;ZHU Daohua;MA Yunping

2012, 34(1): 59-60.

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The tube cracking and leakage of the horizontal tube in economizer of boiler No.2 of a power plant were analyzed. The boiler soot blowing management rule and preventive measures were formulated, which are helpful for ensuring the safe and stable operation of the boiler.

Analysis on anticorrosion measures for boiler tail flue and other equipments of 600MW unit

SHEN Xianping;WANG Jie;WAN Yousheng

2012, 34(1): 61-63.

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The anticorrosion measures for boiler tail flue and other equipments of the 2×600MW unit project of Guizhou Huadian Tongzi Power Generation Company Limited were analyzed. Two schemes were put forward, one of which is to increase the outlet gas temperature and the other is to adopt professional anticorrosion measures. The investment and the cost of operation and maintenance of the two schemes were compared. The result shows that the better choice is to adopt professional anticorrosion measures for the boiler tail flue and other equipments, and to increase the outlet gas temperature is not recommended in this project.

Analysis on problems existed in desulphurization system of 600MW unit and their treatment

SUN Zhikuan;WEN Xiufeng;YANG Jianping;SUN Fengwei

2012, 34(1): 64-66.

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Some problems found in operation of desulphurization equipment in Huadian Inner Mongolia Energy Corporation Limited, Baotou Power Generation Branch Company were introduced and analyzed. Some technical measures for preventing blockage of GGH and scale formation in absorption tower were put forward and implemented; and the good result was obtained in practical operation.

Application of tiny oil ignition technology in Wangting Power Plant

HU Long

2012, 34(1): 67-69.

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The characteristics of four kinds of oilsaving ignition technology were introduced. The system composition, the step for putting the system into operation and the matters needed attention of the tiny oil ignition system were expounded. Aiming at the problems occurred in its application process, relevant measures and solving methods were put forward. The result of successful application of the tiny oil ignition technology in boiler No.11 and No.14 of Wangting Power Plant has shown that the oil conservation effect of this technology was favorable.

Analysis on economical benefit of desulphurization index competition

MO Junwu;PENG Yizao;LI Jiang

2012, 34(1): 70-72.

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In Jiangsu Huadian Yangzhou Power Generation Company Limited, in order to strengthen the desulphurization operation management, the desulphurization index competition was carried out. The desulphurization indexes were disassembled and explained in detail. The formulation and implementation of the procedure of desulphurization index competition were introduced. The experiences and shortcomings in development of desulphurization index competition were summarized.

Analysis on reasons of unbalance of threephase currents of double feed asynchronous wind power generator stator

DI Hailong;LIANG Zhenfei;WANG Bo

2012, 34(1): 73-75.

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In the double feed asynchronous wind power generators No.62 and No.41 of the Inner Mongolia Huadian Huitengxile Wind Power Generation Company Limited, the unbalance faults of stators threephase currents had occurred one after another. The reasons of the faults were analyzed and tested; the concrete fault positions were found out. The result of this paper can be used as reference for other wind power farms in stator overhaul of double feed asynchronous wind power generators.

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