Integrated Intelligent Energy

Reformation of electric roller of bucket wheel reclaimer

ZHANG Xiangfei;WANG Jiantao

2011, 33(11): 1-2.

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The faults were occurred frequently in operation of electric roller of bucket wheel reclaimer. The problems were analyzed. A reformation method for roller driving part (the motor, the decelerating drive gear and the control part) was put forward. After the electric roller of the bucket wheel reclaimer had been reformed, the problem of frequent damage of the electric roller was solved; the service life of the roller was lengthened; the maintenance load was decreased; and favorable effect was obtained.

Operation and management measures of positivepressure directfired pulverizing system

ZHAO Yusheng;;LI Yong;WANG Bin; 

2011, 33(11): 3-5.

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Limited, Weifang 261204, China)
The normal operation of the pulverization system greatly influences on the safety and economical efficiency of the unit. Combining with the practice of a power generation enterprise, the main problems occurred in pulverization system were analyzed. Aiming at the problems, the relevant countermeasures were put forward. The safety and the economical efficiency of the unit were increased by these countermeasures, which can be used as reference for similar units.

Optimization of automatic fuel control system of 660MW supercritical unit

L Xing;HU Changlin

2011, 33(11): 6-8.

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In the 660MW unit of Huadian Xinxiang Power Generation Company Limited, the fuel measurement was inaccurate; and in startup and stop processes of the mill, there was larger deviation between the air flow in accordance with the unit capacity and the fuel quantity actually fed into the furnace. These problems caused larger disturbance for coordination control system. By using the soft sensor technology and the modeling method, the automatic fuel control system was optimized, and better effect was obtained.

Thermodynamic calculation of steam discharging pipe of safety valve in power plant and its application

ZHANG Xin

2011, 33(11): 9-11.

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The layout form of the steam discharging pipe and the discharge process were introduced. The thermodynamic calculation methods of opentype and closedtype discharge systems were expounded emphatically. Based on the calculation method recommended in ASME B31.1, the methods specified in code for piping design of steam turbine were adopted to solve the critical mass volume ratio. The combining of the two calculation methods can give high calculation accuracy, better operability and obvious effects in practical application.

Experimental research on blended coal combustion for 600MW supercritical boiler

GUO Luyang;JI Mingbin;WANG Fuwen;HUANG Pingping;GAO Chunyang;REN Mingwei;LIN Deping

2011, 33(11): 12-14.

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There are two basic blended coal combustion modes, one of them is premixed combustion, and the other is separately milled layered combustion. Taking a 600MW supercritical boiler as example, the experiments of premixed combustion and separately milled layered combustion were carried out. The experiment results show that when the soft coal ratio is lesser, the premixed combustion mode is more simple and practical, and when the soft coal ratio is larger, to adopt the separately milled layered combustion mode can obtain better result.

Setting calculation of overexcitation protection for large generator set

FAN Yuhao

2011, 33(11): 15-16.

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The setting calculation of the overexcitation protection for generatortransformer unit must be based on the tolerance of the generator and the transformer to the overexcitation. The settings must be matched up with U*-f* limit curve of the excitation system; it must be adjusted in accordance with the backup protection of U*-f* limit component of generator field regulator. According to the analyses of overexcitation curve of the 680MW generator and transformer in Hubei Xisaishan Power Generation Corporation Limited and the U*-f* limit curve of ABB excitation system, the responding value of overexcitation protection and the actuation time were analyzed and calculated concretely.

Analysis on construction experience feedback system of AP1000 nuclear power project

LI Erfei;SHEN Wenlong

2011, 33(11): 17-18.

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Combining with the experience feedback system, which is formed in the construction of unit No.1 of the Zhejiang Sanmen Nuclear Power Station, the AP1000 dependingon project, the orgnization and management, the operation mode and the feedback system were expounded. Aiming at that how to realize the experience feedback of AP1000 project construction effectively, some methods and suggestions were put forward.

Selection and application of cathode protection of electrical grounding grid under geology condition of coastal dredger filled area

YAN Bing

2011, 33(11): 19-22.

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The site geotechnical engineering characteristics of Tangshan Caofeidian Coalfired Heatsupply Power Plant of China Resources were introduced. The cathode protection mode of electric grounding grid and its design calculation method were analyzed. The effects of cathode protection were tested systematically. The test result shows that to select magnesium alloy sacrificial anode in cathode protection of grounding grid can get designed protective potential and can obtain better anticorrosive effect.

Reason analysis of suddenly opening of mediumpressure regulating valve in digital electrohydraulic control system

ZENG Aiping

2011, 33(11): 23-27.

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In the Hunan Changsha Power Generation Corporation Limited, after the overhaul of the unit No.1, the mediumpressure regulating valve suddenly opened during rolling the turbine and warming up two times, and the rotate speed was increasing quickly and can not be controlled. The digital electrohydraulic control system and the reason of the mediumpressure regulating valve suddenly opening were analyzed in detail. After the effective measures were adopted, the suddenly opening of the mediumpressure regulating valve was not occurred again. 

Analysis on ability to spend summer of direct aircooled thermal power unit in north burning hot area

SHI Quancheng;HAN Xiaogang

2011, 33(11): 28-30.

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In direct aircooling unit, the backpressure is higher; the cooling capability of the condenser is affected greatly by external environment. In summer, when the dry bulb temperature is higher, the higher wind speed and higher temperature influence on the fans and the radiators, and their efficiency will reduce; the generation efficiency of the unit will be affected. Based on analysis, it was considered that to adopt some measures, such as to increase the unit fully generating backpressure, to configure the cooling area of aircooling system rationally, to stop the high pressure heater without accident, to spray water mist on external surface of the radiators and others, can increase the ability to spend summer of the direct aircooling unit; which is helpful for ensuring the power grid safety and full generation of the turbine, and the generation efficiency of the unit will be raised.

Online monitoring of power system based on image recognition technology

MA Qing;GUAN Bao′an;ZHANG Yang;LI Ruyan

2011, 33(11): 31-34.

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The rapid development of digital image processing and recognition technology provides good opportunity for automation of online monitoring system of the power system. Whether the electric power equipments operate normally is very important for safe and reliable operation of the system. Based on automatic recognition and analysis functions of the computers, using the image processing and recognition technology, combining with several methods, such as the method of OTSU for threshold selection, the SSDA for recognition and the FD for judgment, the online monitoring of electric power equipments was realized. The traditional manual inspection was replaced by this system, and the efficiency was improved. The advantages of various technologies had been integrated in this image recognition technology, so its processing result is more accurate.
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Analysis on hazard of air leakage in vacuum system of 600MW unit and treatment method

FU Kaihui

2011, 33(11): 35-36.

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Aiming at the characteristics of the vacuum system of 600MW unit, the changes of unit operation parameters caused by local air leakage of the vacuum system were analyzed. The air leakage point was found out; the treatment method was put forward; and relevant measures were adopted. Then the air leakage of the vacuum system did not happen again.

Diagnosis of corrosion and scaling faults of condensers

ZHANG Zhendong;GENG Weizhong

2011, 33(11): 37-40.

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In order to solve the corrosion and scaling problems of condenser′s copper tubes, aiming at the corrosion pits and sediment, the element analysis was done; several experiments, such as the reagent detection, the corrosion coupon, the silt abrasion and antiscaling, were carried out. A conclusion was obtained that the comprehensive affect of silt abrasion, the corrosion behind scaling, the bed operation condition and others led the corrosion and scaling of the copper tubes. According to the diagnosis suggestion, some corrosion slowing and antiscaling measures, such as coating film on tubes plate, water quality control and improvement of reagent adding process, were adopted; and the faults were eliminated.
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Optimization of 380V auxiliary power systemYANG Ke

YANG Ke

2011, 33(11): 41-43.

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In 380V auxiliary power system of the 300MW unit of Sichuan Guang′an Power Generation Company Limited project phase I, the configuration of some low voltage distribution equipments, such as PC, MCC and power inlet switches, was not rational, which formed hidden safety danger for the operation of the unit and its auxiliary equipments when a fault of the auxiliary power occurred. The hidden danger and hazard existing in the 380V auxiliary power system of the unit were analyzed; the optimization scheme was put forward; and safety power supply of the auxiliary power system of the unit was ensured.

Analysis on fault reason of oil turbine pump in lubricating oil system of 600MW steam turbine and treatment

FU Jie

2011, 33(11): 44-46.

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In startup process of the 600MW unit of Sichuan Guang′an Power Generation Company Limited, the fault of oil turbine booster pump in lubricating oil system of the steam turbine occurred, which caused the main oil pump to operate abnormally and the lubricating oil pressure to be low; then the unit starting up process had to cease. The reasons of above problems were analyzed; the relevant preventive measures were put forward, which can be used as reference for handling similar problems.

Application of gate slot structure with guide wall under condition of gate fully opening

LIU Guorui;LIU Xuhui

2011, 33(11): 47-48.

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Starting from the cavity characteristics and the flow pattern, the functions of the gate slot structure with guide wall when the gate is fully opened, which include improving the flow pattern and reducing the risk of the scour and the cavitation erosion on the gate slot, were analyzed. It was confirmed that the gate slot structure with guide wall has good application prospect in the gates on deep hole sluiceway and other high water head plane gates.

Analysis on output water test of condensate treating mixed bed

CUI Shaobo

2011, 33(11): 49-51.

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Combining with the condensate quality of eight generator units of Huadian International Zouxian Power Plant, according to the test and analysis on the monitoring indices of the output water of condensate treating mixed bed, the operator can find the failure controlled parameters in output water quality indices monitoring of mixed bed more conveniently; so the failure operation of the mixed bed with an outoflimited parameter was avoided, and more excellent water quality and steam quality were ensured.

Application of modulation theory in harmonic analysis of AC/DC transmission system

LIANG Jiyun;KANG Jitao

2011, 33(11): 52-53.

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Due to the application of the electronic devices in power system, especially the application of the high voltage DC transmission technology in power system, the harmonic analysis theory and method for power system became very important. Based on the comparison of relevant methods, the principle of the modulation theory and its application in harmonic analysis and calculation were expounded emphatically. The advantages and disadvantages of the modulation theory were summarized; and at last, its development direction was prospected.

Realization of complex report management based on high level programming language WINCC

XU Zhijie

2011, 33(11): 54-56.

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In the upper computer monitoring system of the soot emission reducing control system of a power plant, the high level programming language (VB) and the script programming language VBSCRIPT were used to interface with SQL2005 database under WINCC, and the interface method was introduced. By using this method, the storage and reading out of procedure history data were accomplished. By calling the spread active controls, the query and print of complex reports can be realized, and Exceland HTML files can be output easily. The recombing of the data was analyzed, which provides interface to access procedure operation data in B/S mode.

Implementation of integrated solution of intelligent shore power supply system

CAO Shenghua;XU Dake;WANG Wenqiang;XU Gaowen

2011, 33(11): 57-60.

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The function and composition of the intelligent shore power supply system were introduced. Starting from the angles of emission reduction and energy saving, the feasibility of energy saving and emission reduction of the intelligent shore power supply system was analyzed. According to the current situation of domestic and foreign shore power supply systems, an integrated solution of intelligent shore power supply system was put forward; and a conclusion was obtained, which is that the intelligent shore power supply system has obvious effect in energy saving and emission reduction.

Analysis on communication realizing methods for I/O module of distributed control system

WU Shenghua;WANG Danlin

2011, 33(11): 61-62.

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Four communication realizing methods for communication between the process control stations in DCS and the site I/O modules were introduced. The advantages and disadvantages of various methods were analyzed; and the analysis results provide a reference for concrete application of these four methods. 

Analysis on reason of outputdisappearing fault of oil pump

WANG Hui

2011, 33(11): 63-64.

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In the lubricating oil system of 1000MW steam turbine of a power plant, some air harboured in the outlets of three electric oil pumps. The air formed air resistance, which caused that the output of the oil pump was disappeared and the bushburning accident of the turbine occurred. The accident was introduced. The oil pumps had been reformed two times, and the problem of air resistance was solved successfully. The reasons of the accident were analyzed, providing a reference for related persons.

Analysis on reason of larger vibration of belt conveyor driving device and treatment

LIU Hainan

2011, 33(11): 65-66.

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In the coal handling system of 2×300MW project of Fujian Huadian Zhangping Thermal Power Generation Company Limited, the vibration of the C-4A belt conveyor driving device in first single test run was exceeded the standard seriously. The vibration reason of the belt conveyor driving device was analyzed; and it was pointed out that the main reason of the vibration is that the strength of base and support of the driving device is not sufficient. The support of the driving device had been reinforced, and the fault was eliminated. 

Analysis on reasons of larger water content in desulphurization gypsum

SUN Puchun;YIN Minquan

2011, 33(11): 67-68.

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Combining with the practical operation of FGD system of Huadian International Zouxian Power Plant, the reasons of larger water content in desulphurization gypsum were analyzed. The concrete countermeasures were put forward, which can be used as reference for treatment of similar problems.

Analysis on reasons of larger water content in desulphurization gypsum

SUN Puchun;YIN Minquan

2011, 33(11): 67-68.

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Combining with the practical operation of FGD system of Huadian International Zouxian Power Plant, the reasons of larger water content in desulphurization gypsum were analyzed. The concrete countermeasures were put forward, which can be used as reference for treatment of similar problems.

Analysis on reasons of demister blockage of 600MW unit wet FGD systeme and countermeasures

NIE Pengfei;BIAN Dongsheng;WU Xuemin;ZHANG Hongyu

2011, 33(11): 69-73.

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The working theory of the plate type demister and the category of its scaling were introduced. Aiming at the demister blockage fault, which often occurred in the wet FGD system of the 2×600MW unit of Hebei Datang International Wangtan Power Generation Company Limited, combining with the operation experience of the power plant FGD system obtained for 5 years since it was put into operation, the two main factors influencing on demister blockage and scaling were analyzed; and concrete countermeasures were put forward.

Application of remote monitoring system in wind power generation

WANG Tao

2011, 33(11): 74-79.

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The background of the wind power generation and the development situation of its monitoring system were introduced. The business solutions, the data storage scheme, the system frame and the system arrangement of the wind farm remote monitoring system were analyzed. The application effects of the wind farm monitoring system were summarized; which can be used as reference for domestic relative research and engineering application.

Application of distributed control system in wind generator unit control

YANG Weimin;WANG Bin;QIN Chenghu;DONG Shenggang;SHI Yujia

2011, 33(11): 80-83.

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Taking the main current MW stage doublefed wind generator unit as research object, according to the operation characteristics and distribution features of various parts, the structure features and configuration and application of the current domestic and foreign master control systems of the wind turbines were analyzed synthetically. Based on this, a solution of control system, which is equipment oriented and drawing configurable, was proposed. The control characteristics of the DCS for thermal power generation were blended into this solution. The controller hardware platform was developed independently, which can satisfy new requirements of the unit control system.

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