Integrated Intelligent Energy

Study on selfvibration characteristics of threearm radial gate

XIE Zhixiong;LIANG Minghui;HU Shuangtian

2012, 34(8): 1-4.

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In order to grasp the selfvibration characteristics of the threearm radial gate of a hydropower station, the finite element models based on four calculation modes were established respectively. Using the ANSYS software, the selfvibration characteristics of the gate were calculated. The calculated results of different calculation modes were compared and analyzed. The research results can be used as reference for design calculation of similar gate structure.

Analysis on temperature stress of pier wall of hydraulic structure and research on design of anticrack hidden beam

YANG Junjing;KANG Lirong;ZHU Qinghua

2012, 34(8): 5-7.

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Aiming at the hard condition of effectively control in the concrete cracks of pier wall in hydraulic structure at the water gate, the ship lock and others. The necessity of the anticrack design was expounded, and the design method of the anticrack hidden beam was discussed by calculation and analysis of the temperature stress of the pier wall. The engineering implementation result shows that to configure pier wall hidden beam rationally can control the concrete cracks effectively in the penetrating cracks in especial .It is an anticrack design method with obvious effects.

A fast installation method of water turbine inlet valve

JIAO Xingping

2012, 34(8): 8-9.

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For the hydropower station with the water turbine inlet valve in its design, whether the inlet valve can be installed quickly is one of important factors determining that whether the hydropower station can generate electricity ahead of time. Based on the experiences of construction, a fast installation method of the inlet valve was proposed. The method had been used in practice, and the anticipated goal was achieved.

Design and implementation of power plant simulation supporting system based on virtual DCS stimulative mode

WANG Peng;YANG Weimin;WU Ke

2012, 34(8): 10-13.

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A simulation supporting system based on virtual DCS stimulative mode was introduced. The whole structure of the system was first given,then the partition of function modules, the design and realization of each module, the technical characteristics of the function modules were expounded; and the way to construct the complete simulation system using simulation supporting system with the virtual DCS was described. The practical engineering application of the simulation system in a 300MW thermal power unit shows that the system is effective.

Prediction method of monthly power load based on grey cycle combined model

QIAO Songshan;ZHANG Jianjun

2012, 34(8): 14-16.

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The traditional grey prediction model can reflect the general variation trend of the power load only, but it can not reflect the seasonal fluctuation feature of the power load. Based on the monthly adjusting coefficient, the grey cycle combined prediction model was proposed; and a complex monthly power load prediction with consideration of two tends was studied. The calculation example shows that the prediction accuracy of the combined prediction method is better than that of the traditional prediction method.

Experimental research on blended burning with coal produced in Indonesia

WANG Xiaojun;CAI Xiao;HU Jiabing

2012, 34(8): 17-21.

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In order to reduce the power generation cost and raise the economic benefit of power plant completely, aiming at the combustion characteristics of the 630MW unit boiler of a power plant, the characteristics of blended burning with coal produced in Indonesia were tested. The rational blending scheme was proposed, and the matters needing attention in Indonesia coal blended burning were pointed out. The favorable effect of practical coal blended burning was obtained in the power plant, and the economic efficiency of the unit was improved, which provides powerful technical basis for Indonesia coal blended burning in boilers in the future.

Design of a distributed power generation system driven by fitness equipment with up and down reciprocating mechanism

ZHANG Yua;ZHANG Hanga;SHI Liangxiaob;LIN Haofana;HAO Meijuanb;GENG Jianghuab;JI Zhiyuanc

2012, 34(8): 22-25.

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A distributed power generation system driven by the fitness equipment with up and down reciprocating mechanism was introduced. The system can translate the bidirectional input into single directional output. Whether the substitution of the selected fixed pulley is rotating in forward direction or in backward direction, using the ratchet mechanism, the rotations can all be translated into single direction rotation; and by the gear set, the rotation speed can be raised to high enough to drive the generator to generate electricity. The power generation system can satisfy the requirement of energy conservation and emission reduction. The experiment shows that the average power of the generating system is 200W, and the minimum mass of the weight is 31.56kg. The cost of every device can be recovered for 1.68 years. The power generation system presented in this paper has high utility value.

Construction and application analysis of phasor measurement system in power plant side

REN Baorui;GUO Yuheng;LU Jianhong

2012, 34(8): 26-28.

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The basic working theory, the system structure and the component units of the synchronous phasor measurement system were introduced. The basic

functions of the phasor measurement unit for generator set and the phasor measurement unit for transmission line were analyzed. The application of the phasor

measurement device in the power grid wide area monitoring and control, the measurement and monitoring of the generator powerangle, the monitoring of low

frequency oscillation, the monitoring of the P-Q operation curve and other aspects was expounded.

Analysis on reason of disengagement of hydraulic servomotor piston seal sleeve of steam turbine

DING Huaigao

2012, 34(8): 29-30.

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The retardation and jam occurred in the regulating system of the steam turbine mediumpressure hydraulic servomotor in a thermal power plant.

According to the analysis, it is determined that the gland of the mediumpressure hydraulic servomotor was installed askew by the maintenance staff，the

seal sleeve was squeezed with the shell. When the servomotor piston is moving down quickly, the friction force act as resistance for the seal sleeve, which

disengages the seal sleeve upward and makes the fault of mediumpressure hydraulic servomotor. The servomotor seal sleeve had been taken down and repaired,

and it had been installed again. The hidden danger of the equipment was eliminated, and the equipment accident was avoided.

Experiment of primary frequency regulation of 2×600MW supercritical unit in Gongxian Power Plant

LAN Ligang;GUO Tongshu;ZHAO Ming;ZHU Nengfei

2012, 34(8): 31-33.

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The function setup of primary frequency regulation for the supercritical oncethrough boiler unit in Gongxian Power Plant was introduced.

Depending on the rational setup of the speed variation rate of DEH and CCS for primary frequency regulation, the fast action of DEH side in primary frequency

regulation operating process was realized; the primary frequency regulation requirement of the power grid was satisfied; and the frequency stabilization and

fine operation quality of the power grid were ensured.

Analysis on problems existing in startingup and operation of 150MW unit and preventive measures

WEI Shengluan

2012, 34(8): 34-36.

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The main problems existing in commissioning and commercial operation of the 2×150MW unit in Panzhihua Branch of Huadian Sichuan Power Generation

Company Limited were summarized. Combining with the structure features and practical situation of the unit, some response measures on system reformation and

operation adjustment were proposed, and the unit safe operation is ensured.

Analysis on fault of frequency converter for 6kV draft fan

MURONG Yongjian

2012, 34(8): 37-39.

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The irrational design of control circuit of frequency converter may cause hidden trouble for safe and stable operation of the frequency converter.

Taking the fault of the frequency converter for the 6kV draft fan in Yunfu Power Plant as example, the reasons of the fault were analyzed. It was pointed

out that the irrational design of the inner control circuit of the highvoltage frequency converter and the poor quality of the elements are the crucial

reasons of the fault of the highvoltage frequency converter. The preventive measures were put forward to reduce various losses caused by the fault.

Measures for solving problem of outdoor DC grounding in substation

LIN Wangqing

2012, 34(8): 40-41.

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The DC grounding faults exist in the outdoor equipments of 220kV and higher voltage grade substations inevitably. According to relevant examples,

the types of the grounding fault were summarized. The reasons of the grounding faults were analyzed. Aiming at the grounding faults, the improvement measures

were proposed; and the safe and stable operation of the equipments were ensured in practice.

Analysis on out of tolerance problem of trolley track of bridge type grab ship unloader and repair method

NIU Wenxian;GENG Jiabin

2012, 34(8): 42-43.

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After the 1800t/h bridgetype grab ship unloader of a project had been assembled; an out of tolerance problem of the trolley track was found.

The problem was introduced; and the reasons of the problem were analyzed. The defect was repaired; and some preventive measures were proposed, which provides

reference for manufacturing and installing of the subsequent products.

Analysis on unit disconnection accident of 700MW unit caused by switchover failure of auxiliary power and preventive measures

YIN Song

2012, 34(8): 44-46.

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After the 700MW unit of a power plant had been connected into grid, the auxiliary power switchover had failed; due to the bus voltage loss, the 1A

stator cooling water pump was stopped; although the 1B stator cooling water pump started automatically, but the stator cooling water pressure difference low

signal had been given out, and protection device had tripped and caused the generator disconnection from the power system. The reason of the protection trip

was analyzed in depth; and the hidden dangers were found. Some prevent measures were proposed with 3 aspects of measures such as optimizing the interlock

protection logic, replacing the instruments by new type instruments and formulating antiaccident measures; and the safety hidden dangers for unit operation

were eliminated effectively. 

Analysis on reason of frequent trip of frequency converter for induced draft fan and countermeasures

PAN Zhishang

2012, 34(8): 47-48.

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In boiler No.1 of a power plant, the communication fault of the frequency converter for induced draft fan B occurred repeatedly. The reason of the

fault was analyzed and searched; and it was verified finally that the fault reason is that the connection of the plugin connectors between the fiber

communication mother board and the fiber communication daughter board in master control system was loose. The treatment method of the converter communication

fault was introduced; and some suggestions on converter operation were given.

Improvement of signal functions for important thermotechnical protection system

SHANG Haiguo;LI Juan

2012, 34(8): 49-51.

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Along with the increase of unit capacity, the single signal of some important protection systems influences on the reliability of the system.

According to the requirements of the file DL/T 5428—2009‘Technical Code for Design of I&C Protection System in Fossil Fuel Power Plant’, and the file DL/T

1083—2008‘Specification of Distributed Control System for Fossil Fuel Power Plant’, aiming at the current situation of the FSSS protection system of

Huadian Weifang Power Generation Company Limited, in which some signals are singlechannel signals and there is not the alarm function for single signal

failure, the functions of important protection signals were improved. The improved important protection system signals ensure safe and stable operation of the system.

Analysis on reason of overload trip of generator stator caused by fault of excitation system

CHEN Jianyang

2012, 34(8): 52-53.

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An overload trip accident of generator stator caused by fault of synchrotransformer of the generator excitation system was introduced. The

accident reasons and treatment process were analyzed; and the preventive measures were put forward to avoid similar accident.

Research and improvement of variable frequency control system for draught fans of 300MW unit

ZHENG Wei

2012, 34(8): 54-56.

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Taking the induced draught fans of the 300MW unit in Tianjin Huaneng Yangliuqing Thermal Power Company Limited as example, the relative logic and

functions of the automatic control system after reformation of variable frequency control system for the induced draught fans were introduced. Some problems

were existed in the variable frequency control system, which including that the adjustment speed of the frequency converter is faster than electric actuator

of the fan inlet damper adjustor, and when one of the two fans is driven by frequency converter and the other is driven by 50Hz power source, there are not

automatic balancing and deviation rectification functions in the original control system. In order to solve above problems, the electric actuator of the fan

inlet damper adjustor was replaced, the parameters of the PID adjustor were adjusted, and the two fans automatic balancing function and deviation

rectification logic were added into the system. The static and dynamic tests and practical operation show that the improvement of the variable frequency

control system achieves expect goal, the induced draught fans operate more economically and reliably.

Monitoring and intervention of vibration of turbine generator stator winding

LIU Shengjian

2012, 34(8): 57-59.

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In operation of the turbine generator, under the action of forces, the stator winding may vibrate; and the abnormal vibration of the end of the

winding will cause faults. The feasibility and the necessity of additional installation of optical fiber vibration monitoring system onto the turbine

generator were analyzed. The installation method of the optical fiber vibration measurement probe was described. After the optical fiber vibration

measurement system had been installed additionally onto the generator No.4 of Guangdong Zhuhai Jinwan Power Generation Company Limited, by means of manual

intervention, the vibration amplitude of the winding end was reduced effectively. 

Protection configuration and way of program trip shut down in the protection for the large generatortranformer set

GONG Likui

2012, 34(8): 60-62.

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In process of the large generator set shut down , if operate not appropriate or the protection install not reasonable , not only damage the

generator set,also to bring about seriously influenc for the electrical network .This paper aims at the large generator set shut down the process in the

extensive adoption of procedure trip to shut down the way, is convenient to trip in the procedure to the large generator set protect of protection

configuration were analysed， a few protections configuration was contrasted and put forward in the light of suggestion.

Method for improving quality of vulcanization glued joint of coal handling belt under lowtemperature condition

LIU Shuming;ZHANG Xuefeng

2012, 34(8): 63-63.

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Under low temperature condition, the quality of vulcanization glued joint of the belt joints for coal handling is generally poor; the strength and

abrasion resistance of the glued joints of coal handling belt all can not satisfy the quality requirement. The reasons influencing on the quality of the belt

glued joints under low temperature were analyzed. The method to improve the quality of vulcanization glued joint of coal handling belt joints under low

temperature was found.So the abovementioned problem was solved thoroughly.

Analysis on reason of frequent blockage of desulphurization demister and countermeasures

YANG Honghui;CHEN Chen;LIN Jixiang;LIU Peng;MA Fafeng

2012, 34(8): 64-65.

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The desulphurization demister of Shangqiu Yudong Power Generation Company Limited was blocked frequently. The fault was inspected and analyzed，and

it was determined that the main reasons of frequent blockage of the demister are that the original gas flue and the cleaned gas flue are too short, and the

arrangement of the wash water tube and the angle of the jet nozzle of the demister are irrational. A suggestion on reformation of the wash water system was

put forward. The suggestion had been implemented, and favorable economic benefit was obtained.

Optimized design of sealing air of damper gate for FGD system of thermal power plant

WU Chong

2012, 34(8): 66-67.

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The design of sealing air system of flue gas damper gate for thermal power plant FGD system was introduced and optimized. Taking 2×600MW unit as

example, two sealing modes for flue gas damper gate, in which the sealing air fan and the primary air of the boiler were used respectively, were analyzed,

and their energysaving effects were compared.

Problems existed in circulating water residual heat utilization system and improvement

LI Tiejun

2012, 34(8): 68-72.

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In the steam turbine of a power plant, the heat pump technology was used to recover the great amount of lowtemperature waste heat of circulating

water for heat supply in winter. The theory of the circulating water waste heat recovery by the heat pump in the power plant was introduced. The problems

occurred during debugging were analyzed，and improvement measures were proposed, which can be used as reference for popularization and application of the

technology and relevant feasibility study and design.
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Analysis on energysaving effect of lowpressure economizer installed in 300MW grade units

SHI Yan;LIANG Xiujin

2012, 34(8): 73-76.

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Aiming at the question of the energysaving benefit of the lowpressure economizer installed in power generation unit, taking a system reformation

project of a power plant, in which the lowpressure economizer was installed in a 300MW grade unit, as example, the energysaving effect obtained by

theoretical calculation was compared with the site measured result, and the energysaving effect of the lowpressure economizer applied in 300MW grade unit

was analyzed objectively.

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