Integrated Intelligent Energy

Analysis on optimization of steam sealing gap adjustment for 600MW steam turbine

DU Jinwei;JU Qiang;ZHANG Qingguo

2012, 34(2): 1-4.

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The steam sealing gap is a major factor influencing on the thermal efficiency and thermal economical performance of steam turbine, and its

adjustment method is especially important. The total process of semiinstalled cylinder steam sealing gap adjustment for the subcritical 600MW steam

turbine of Huadian International Zouxian Power Plant was expounded. Various factors influencing on the accuracy of semiinstalled cylinder steam sealing gap

adjustment were analyzed. The new technology of fullyinstalled cylinder steam sealing gap optimal adjustment was introduced. Based on experiment, a

satisfactory result of the 600MW turbine steam sealing gap optimal adjustment was obtained. The optimal adjustment scheme can provide a reference for

persons of the same profession.

Optimization measures of energysaving for 600MW thermal power unit

YANG Chengqiang;YANG Jianping

2012, 34(2): 5-6.

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Take 600MW thermal power unit of Huadian Inner Mongolia Energy Corporation Limited. Baotou Power Generation Branch Company as the example, overall

analysis was done for its circulating water system, boiler combustion system, soot blowing system, auxiliary system, the optimization measures for

combustion, steam turbine sliding pressure, circulating water system, condensate pump motor frequency reformation, gland seal reformation, dewatering pipe

rearrangement, etc. were implemented, the favorable energysaving effects were obtained.

Application of oxygen soft measurement system in 600MW supercritical boiler

ZHOU Liqun;ZHANG Bifang;XU Zhongchuan

2012, 34(2): 7-10.

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The problems existing in traditional oxygen metering and the advantages of the soft oxygen measuring system were analyzed. The soft oxygen

measurement system had been used in a 600MW supercritical boiler; the oxygen control was optimized; the power consumption of air and flue gas system was

reduced; the boiler operation safety was ensured, and the boiler operation efficiency was enhanced. 

Improvement and perfection of flame detector system of 600MW unit boiler

DONG Maoliang

2012, 34(2): 11-12.

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The problems existing in operation process of flame detector system of two 600MW units in Harbin Third Power Plant of Huadian Energy Corporation

Limited were introduced. The main reasons, which cause the flame to be unstable, were analyzed. The flame detector system had been improved and perfected;

its sensitivity and reliability were increased greatly; and the safe and reliable operation of the units was ensured.
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Analysis and prevention of tube crack of water wall in 600MW supercritical unit

WENG Jinyu

2012, 34(2): 13-15.

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Due to that there are many factors influencing on the tube cracking fault, and it can not judge the positions on low header outlet and upper header

outlet corresponding with the spiraled tubes intuitively, it is difficult to find the reason of tube cracking of spiral water wall in a 600MW unit. Based

on the metallographic analysis, the chemical analysis and the mechanical test of the cracked tube, it was found that the main reason of the water wall tube

cracking is overtemperature, and the preventive measures were given, which provides certain reference for tube cracking analysis.

Static and dynamic analysis on frame structure of gantry gate hoist

HU Youan;XU Ting;GU Xiaofeng

2012, 34(2): 16-21.

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Aiming at the frame structure of the gantry gate hoist of a dam, the finite element analysis model was established in the large finite element

analysis software ANSYS. According to the practical operation process of the hoist in hydropower station, several typical conditions were selected; and under

different load combination, the static characteristics of each condition were analyzed and calculated; and the rigidity and the strength of the structure

were verified. In order to research the dynamic characteristics of the frame structure, based on the vibration mechanics, using the modal analysis method,

the natural vibration characteristics of the structure were analyzed; and more exact and intuitive natural frequency and vibration type were obtained. The

result shows that the frame structure of the gantry gate hoist is safe and feasible, but there is stress concentration in some parts, the natural vibration

frequency of whole machine is smaller, and the parts with larger stress should be reinforced, and its structure design should be optimized properly.

Design of large sector gate of navigation drainage sluice in Jinqing Old Port

ZHOU Jun;YU Honggang;XIE Lihua

2012, 34(2): 22-23.

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The structure and design method of the large arcshape sector gate of navigation drainage sluice in Taizhou Jinqing Old Port and the operation

features of the gate hoist were introduced, providing reference for design of sector gate and common large gates.

Reliability design of switch type excitation system based on PSVR 100 regulator

PENG Gang

2012, 34(2): 24-27.

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Aiming at the faults problems, which may occur in operation of switch type excitation system, based on the fundamental of PSVR100 excitation

regulator made in Guodian Nanjing Automation Company Limited, the reliability design method of the regulator, the main circuit and the driving circuit was

put forward. The test results show that the reliability of switch type excitation system can be increased effectively by adopting this reliability design

technology. 

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Research and design of field data acquisition module in power plant side

LIN Shilong

2012, 34(2): 28-32.

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A new method used in power plantside real data acquisition was introduced. The field data acquisition module is made up of the data transmitter

and the COM component, which is installed in the industrial control computer of the continuous emission monitoring system (CEMS). The field data

acquisition module had been developed and used in Jiangsu coalfired unit FGD realtime monitoring and information management system; and the result shows

that using the field data acquisition module, the development and debug cost was reduced, the system stability was enhanced, and the data privacy was

realized.

Application of software Flowmaster in nonsteadystate operation of startup feedwater system of AP 1000

LUO Feng;ZHOU Tao;JIA Ruixuan

2012, 34(2): 31-34.

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Aiming at the configuration of the startup waterfeed system of AP 1000, using the onedimensional fluid analysis software Flowmaster, a water

feed system model was established. When the normal power supply of AP 1000 is outage, one startup waterfeed pump will be driven by standby diesel generator

set and will operate normally. Suppose that the pump stops suddenly, based on the transient analysis, the nonsteadystate operation of the waterfeed

system was simulated, and the simulation result was obtained. According to the comparison of the simulation results of different configurations, it was put

forward that to install an air intake valve in backward position of the control valve can decrease the fluctuation of the flow. When the gas storage was

installed, the fluctuation of the flow can be decreased, and the pressure rapidly increase will not occur, so the cavitations can be prevented effectively.

According to the calculation result, the control method of the transient characteristics can be established; the fluctuation of the flow can be decreased and

the cavitations can be controlled; so the startup waterfeed system of AP 1000 will operate more safely and stably.

Stator whole withstanding voltage test and cooling water system test of an ALSTOMmade unit

SHENG Guolin

2012, 34(2): 34-35.

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The main technical parameters of stator of the ALSTOMmade unit installed in the Three Gorges Left Bank Hydropower Station were introduced. The

test items and test standards of the stator whole withstanding voltage test and the cooling water system test were put forward; the test sequence and the

concrete implementation plans of different tests were drawn up; and some security matters were pointed out.

Analysis on antiabrasion technology for CFB boiler

HE Xianghui;

2012, 34(2): 36-39.

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Research Institute Company Limited, Beijing 100069, China)
The abrasion mechanism of CFB boiler and several kinds of antiabrasion technologies were introduced. Combining with the advantages and

disadvantages of various antiabrasion technologies, the measures for increasing the wear resisting property of CFB boiler were analyzed, and the problems

needing attention in antiabrasion technical reformation process were pointed out.

Analysis on reasons of leakage of 300MW CFB boiler and alarm optimization

DAI Xihui

2012, 34(2): 40-42.

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The leakage of CFB boiler is can not be avoided; and when the leakage occurs, the boiler must be stopped to treat the leakage fault. So it is necessary to find the leakage as early as possible, at early or medium stage of the fault. The leakage phenomenon of the 300MW CFB boiler and the history curves of relevant parameters in leakage process were analyzed. The optimized measures of alarm logic of boiler leakage were put forward and implemented; then the MFT triggered by serious leakage is avoided; the accident expansion is prevented; and the live of the boiler is lengthened.
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Analysis on incorrect action of transformer differential protection

LIN Chubin

2012, 34(2): 43-46.

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Aiming at the incorrect action of the main transformer differential protection, the reasons of the incorrect action were analyzed. Starting from the collecting of the technical analysis materials of the incorrect action and the finding of reasons of the incorrect action, the method and procedure to inspect the incorrect action of the transformer differential protection were expounded, which provides reference for the relay protection professionals in field accident investigation.

Thermotechnical logic design for variable frequency reformation of induced draft fan and energysaving effect analysis

LIU Xiaojun;XIAO Lizheng

2012, 34(2): 47-49.

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Taking the variable frequency reformation of ID fan of the 600MW boiler in Hubei Huadian Xiangyang Power Generation Company Limited as example, the thermotechnical logic design of variable frequency reformation and the cold functional test and hot functional test processes of the unit were introduced. The test results and the operation data show that the reformed ID fan operates reliably, and remarkable energysaving effect was obtained.

Comparison of electronic instrument transformer and electromagnetic instrument transformer and their application in smart power grid

WANG Zhenyue;CHEN Wei;LU Haicheng;SUN Huyun

2012, 34(2): 50-52.

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The composition and the operating principle of the traditional electromagnetic instrument transformer and the electronic instrument transformer were introduced. The advantages and the disadvantages of the two types of instrument transformer were compared and illustrated by practical examples. The sampled variables in intelligent substation and in traditional substation were compared; and the development direction of the instrument transformer was prospected.

Application and improvement of reserve power supply autoputinto device

LIANG Guozhu

2012, 34(2): 53-54.

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The reserve power supply autoputinto device is designed to increase the reliability of the power supply. However, when the bus fault occurred, the automatic switchover of the reserve power supply autoputinto device may enlarge the accident influencing scope and accident seriousness. The application of the reserve power supply autoputinto device in Guangdong Zhuhai Jinwan Power Generation Company Limited was introduced. An improvement switchover method of the reserve power supply autoputinto device was put forward. After the reserve power supply autoputinto device was improved, when the input switch tripped caused by a fault, the bus tie switch should not switch on automatically; so the switchover of the reserve power supply autoputinto device is blocked.

Mechanical analysis and treatment method of belt line deflection of belt conveyer

WANG Xiaobin

2012, 34(2): 55-58.

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The belt line deflection is the most common fault of the belt conveyer, and it is difficult to solve the fault thoroughly. Taking the different force angles of the carrier roller and the belt as research objects, the reason of belt line deflection was analyzed; the relevant treatment method was put forward; and the belt line deflection fault had been eliminated.

Analysis on problems occurred in debugging of unit No.5 protection of Wanneng Tongling Power Generation Company

YE Pengzhen

2012, 34(2): 59-61.

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The problems occurred in debugging of unit No.5 generator protection of Wanneng Tongling Power Generation Company, such as the stator grounding, the rotor grounding, the various power protections and the reliability of the auxiliary power switchover, were analyzed. The matters needing attention in debug and setting process of REG 670 protection were expounded. The results of this paper can be used as reference for unit No.6 and other large units in generator protection debugging.

Analysis and treatment of overvibration of bearing bush in turbine rolling process

CAO Yusheng

2012, 34(2): 62-64.

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In the Lianzhou Power Plant of Guangdong Lianzhou Yuelian Power Plant Company Limited, at the process of AC and DC oil pump test of the turbine lubrication oil system of unit No.2, the overpressure valve of the lubrication oil system was unable to reset normally and quickly; and this leaded to low oil pressure and tripping of the steam turbine. After this, in two times hotstate rolling processes of the steam turbine, the vibration of bearing bush No.1 was exceeded the standard, the turbine had been tripped. The main reasons of this fault and the exposed problems were analyzed, and the relevant preventive measures were put forward, which can be used as reference for other power plants.

Application of increment function observer in steam temperature control of Wshape flame oncethrough boiler

LAN Ligang;GUO Tongshu;MA Rui;LIU Mingli;ZHU Nengfei

2012, 34(2): 65-67.

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The control of the Wshape flame supercritical oncethrough boiler has some features, which include that the overheated steam temperature control and the coalwater ratio control are strong coupled，the furnace temperature is too high and leads severe coking，the control object of the overheated steam temperature has larger lag and longer inertia time and others. Aiming at above features, the increment function observer and state feedback control were added into the overheated steam temperature cascade PID control system of the 2×600MW unit in GongXian power plant. The practical commissioning and application show that the dynamic characteristics of the overheated steam temperature were significantly improved; and in the process of condition changing, the deviation of overheated steam temperature was controlled within the allowed range. The design scheme has better practical applicability and provides certain reference for supercritical units in steam temperature control.

A new slurry density measurement device for desulphurization system

WANG Yang;REN Zhen;SHEN Yuhui;DENG Huipeng

2012, 34(2): 68-71.

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The current slurry density measurement methods used in desulphurization systems were introduced. Aiming at the defects of the existing measurement devices, a comprehensive measurement device using differential pressure method was developed; the slurry density measurement function of the developed device is accurate, stable and reliable, and the device has pH value measurement and field sampling functions too. The device, in which the density measurement, the pH value measurement and the sampling were integrated, has advantages of lower cost, good operation stability, high measurement accuracy and long service life, so it can make favorable economical benefit and social effect. 

Optimization of desulphurization system operation mode and economic analysis

KUANG Renqin

2012, 34(2): 72-74.

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In order to decrease the power consumption of desulphurization system, in the Jiangxi Fengcheng Phase II Power Plant of Ganneng Corporation Limited, some measures, such as to blend the coal rationally, to stop the booster fan in low load condition, to decrease the number of the slurry pumps in operating, to adjust the pH value of the slurry timely, to raise the operation efficiency of the ball mill and others, were adopted to optimize the operation mode of the desulphurization system. Due to the optimization of the operation mode, the service power consumption rate had been lowered obviously, and favorable economic benefit was obtained.

Configuration and type selection of equipments for wet FGD system without bypass in coalfired power plants

XU Bin;TIAN Lijuan;TAO Aiping

2012, 34(2): 75-76.

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The feasibility of simplifing the desulphurization system configuration, optimizing the main equipments selection and adding anticorrosion and antiabrasion measures were analyzed. The measures for ensuring the reliability of desulphurization equipments after eliminating the flue gas bypass were expounded, which can be used as reference for FGD system in equipment configuration and selection.

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