Integrated Intelligent Energy

Reformation of unit No.5 in Hunanzhen Hydropower Station for vibration attenuation and capacity expansion

YU Huiqing

2011, 33(8): 1-4.

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The reasons of reformation of unit No.5 in Hunanzhen Hydropower Station for vibration attenuation and capacity expansion were introduced. The implementation of the reformation for vibration attenuation and capacity expansion of unit No.5 was expounded. The test and operation results of reformed unit No.5 of Hunanzheng Hydropower Station show that the reformation is very successful; and the technical data of the unit were reached expected value of the capacity expansion reformation.

Reformation of main shaft air supplying valve in Suofengying Power Plant

LUO Le;CHEN Hao

2011, 33(8): 5-6.

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The problems existed in original gas supplying valve of Huadian Guizhou Suofengying Power Plant were analyzed. The existing gas supplying device was reformed. The buffering type gas supplying valve with new material and new structure was adopted; the stability and the efficiency of the unit were enhanced.
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Protection configuration of 275kV switching station of Asahan First Stage Hydropower Station

DU Zhihong

2011, 33(8): 7-8.

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The bus protection, the protection of shortconnectline, the switch protection, the line protection and the protection for short line configured for 275kV switch station equipments of Asahan First Stage Hydropower Station were analyzed. The difference between the intrinsic functions of devices and the practical application was pointed out. The application of the concrete functions of protection devices and the matters needing attention in operation were expounded.

Configuration of over voltage protection for excitation system of Tongbai Hydropower Station

DI Haiyan;HUANG Xibin;CHEN Lingfeng

2011, 33(8): 9-11.

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The reasons of over voltage in AC and DC sides of the excitation system were analyzed briefly. The configuration of over voltage protection for excitation system of generator set in East China Tongbai PumpedStorage Power Station and the calculation of related parameters were introduced, which can be used as reference for other units.

Development design and application of large diving tubular pump set

LIU Jianlong;TAO Aizhong

2011, 33(8): 12-18.

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Based on research of the design of the pump station structure, the model test of the diving tubular pump, its manufacturing in factory and true machine test, combining with the own features of diving tubular pump, under the situation of special low pumping head, the horizontal type diving tubular pump, the designed flow of which is 10m3/s and the impeller diameter of which is 2m, the domestic largest one, was selected; and the efficiency of the pump set of 77% can be obtained.

Research and improvement of hydrogen peroxide passivation technology

MA Qi;YANG Daowu;LIU Yi;REN Zhuo;TANG Yuan

2011, 33(8): 19-20.

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By using the single factor variable method, the hydrogen peroxide passivation technology had been improved, in which the cupric sulfate spot test is used to detect the quality of the membrane caused by hydrogen peroxide passivation technology. The research result shows that the optimized recipe and craft are as below: the mass fraction of the hydrogen peroxide is 0.5%, the mass fraction of chelating agent X is 0.15%, the pH value of the passivation liquid is 9.6, the passivation temperature is 40℃, and the passivation time is 6 hours. The passivation craft can increase the whole corrosion resistance of the carbon steel greatly.

Improved design of secondary circuit of automatic safety device

PANG Xueyue

2011, 33(8): 21-22.

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The design scheme of the safety and stability executing substation of a power plant was introduced. The reliability of its secondary circuit was analyzed; some improvement measures were put forward; and aiming at the similar problems occurred in projects, relevant suggestions were given.

Design features of belt conveyor for hydropower station

CAO Yungai;JIAO Xiaowu

2011, 33(8): 23-24.

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The application of the belt conveyor in hydropower stations was introduced. Combining with the practical dirt cleaning system project of the hydropower station of Hunan Dayuandu Navigation and Hydropower Project, the arrangement of whole machine and the structure form of the belt conveyor for hydropower station were expounded. The design features of the belt conveyor for hydropower station were analyzed. After the belt conveyor was put into service, the satisfactory effect was obtained.

Experimental research on vibration caused by blasting for dam base excavation engineering of Lizhou Hydropower Station

HOU Zhongfa;LI Rongguo

2011, 33(8): 25-26.

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Based on research and analysis on the data of blasting experiment of dam abutment of Lizhou Hydropower Station, the attenuation laws of blasting vibration suitable to special geology and geography conditions of this hydropower station were obtained; and the blasting control parameters for excavation engineering of dam base surface were provided. Simultaneously, according to site observed results, the reference for forecast of blasting vibration velocity and security checking was provided.

Analysis and improvement of malfunction of protection 'all stopping when 500kV switch tripped' under 3/2 connection mode

WANG Dongya;LIN Shaoming

2011, 33(8): 27-29.

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In the Guangdong Zhuhai Jinwan Power Generation Company Limited, during the test of the generatortransformer unit protection device G60, it was found that the protection 'all stopping when 500kV switch tripped' configured in the protection device acted incorrectly. Based on indepth analysis, it was considered that the main reason of the fault is the malfunction of the generatortransformer unit protection device. The improvement method of the protection logic was put forward; the protection malfunction happening again was avoided, and a serious hidden danger of the generatortransformer unit protection device was eliminated.

Reasons of larger vibration of drainage tubes in heat supply network of 300MW heat supply units and treatment

MA Yanxin

2011, 33(8): 30-31.

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The reasons of vibration of drainage tubes in heat supply network of two 300MW heat supply units in a power plant were analyzed. Based on this, an improving scheme was put forward, according to which the steam inlet gate of the heat supply network heater had been replaced by adjustable valve, and the drainage electrically operated gate had been replaced by drainage adjustable valve; and the vibration of drainage tubes of heat supply network heater was eliminated.

Improvement of reliability of switching over operation between main and standby excitation systems of thermal power plant

CHENG Wei;SHI Yunfeng

2011, 33(8): 32-33.

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In the switching over operation process between main and stand by excitation systems of a thermal power plant in Guangzhou, the reactive power fluctuated greatly, and the excitationloss accident of the unit was happened. Aiming at the above problems, the current switching process of parallel silicon controlled rectification and diode rectification was analyzed, and the mechanical characteristics of the voltage regulating device of the standby excitation system were analyzed too. The measures to increase the reliability of switching over operation between main and standby excitation systems were put forward, and the reliability of switching over operation between main and standby excitation systems was increased effectively.

Analysis on motor control circuit and its reformation

LI Qiuping

2011, 33(8): 34-36.

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The Pmac 801 intelligent protection controller was introduced. According to several accidents occurred in the power plant, the motor control circuit, which includes low voltage 380V molded case circuit breaker plus contactor with Pmac 801 intelligent protection controller, was analyzed theoretically. Some existing problems were pointed out, and the solving methods were put forward.

Application of drumtype filter screen in nuclear power projects

HUANG Haibin

2011, 33(8): 37-40.

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The rotary filter screen and the drumtype filter screen were compared. The structure, the advantages and disadvantages, the calculation for type selection and the application of the drumtype filter screen were introduced emphatically, the purpose of which is to enhance the understanding of the drumtype filter screen and to promote the application of the drumtype filter screen in engineering construction.

Analysis on reasons of fault of boiler primary air fan

FU Zhongli

2011, 33(8): 41-42.

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The reasons of faults occurred in operation of primary air fan were analyzed. Based on calculation and comparison, it was determined that the basic reason, which causes the air fan can not operate normally, is incorrect selection of the bearing type for the air fan in design. The concrete solving method was put forward and implemented, and the primary air fan operateswell.

Special protection device reformation for hydraulic coupler of reclaimer bucket wheel drive station

HE Yanqing;LI Fengsheng

2011, 33(8): 43-44.

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Combining with the service condition of the hydraulic coupler of reclaimer bucket wheel drive station in Shenhua Tianjin Coal Dock Company Limited, taking the protection modes of other site equipments as reference, a reformation scheme for protecting the safe operation of hydraulic coupler was put forward. The scheme design process, the installation and implementation of the reformed protection device and its operation and maintenance were introduced. After the scheme implementation, through the test of site operation, the expected effects were achieved.

Analysis on reason of oil level continuously falling in oil tank of boiler feed pump turbine

BI Yuheng;L Pengfei

2011, 33(8): 45-46.

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The oil level in oil tank of the boiler feed pump turbine B of 600MW supercritical unit No.2 in a power plant was falling continuously, and the phenomenon was analyzed. According to the analysis, it was determined that the reason of the oil level falling is siphon. The solving methods and preventive measures were put forward.

Analysis on electrical monitoring and management system of Huaneng Tongchuan Power Plant

ZHANG Xuefeng;WANG Xiaohui

2011, 33(8): 47-48.

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The features of the electrical monitoring and management system of Huaneng Tongchuan Power Plant were introduced. The advantages of the system in the power plant production technical management, especially in equipment accounts, the settings management and the accident analysis, were analyzed. Based on deepseated data mining, the power plant management level was improved, and favorable economic benefit was obtained.

Analysis on reasons of blockage of doubleinlet & doubleoutlet coal mill separator

YIN Jun;LI Jianxing;YAN Yanhua;YIN Minquan

2011, 33(8): 49-52.

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The abnormal operation conditions of doubleended ball mill separator for 1000MW ultra supercritical boiler were introduced. The problems, which happened during the separator operation and maintenance, were expounded. Aiming at the influences of internal wear and air leakage, the structure design, maintenance and management and equipment reformation of this type mill separator were analyzed comprehensively; and some improvement suggestions were put forward.
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Analysis on reasons of wear of balance disc of fuel oil feeding multistage pump and countermeasures

HOU Dongwei

2011, 33(8): 53-54.

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In operation of the horizontal type 9stage centrifugal oil delivery pump of a thermal power plant in Zhengzhou, the balance disc was worn seriously, and the oil leakage fault was occurred frequently in machine sealing. The above problems were analyzed; and according to this analysis, it was determined that the main reason of wear of the balance disc is that the axial thrust can not be counteracted by the balance disc. Relevant reformation measures were adopted, and the fault rate of the oil feeding multistage pump was decreased greatly.

Application of distributed control system OC6000e in upgrade of XDPS-400

ZHANG Junwei;LI Yongkang

2011, 33(8): 55-57.

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The defects in software and hardware of original distributed control system used in unit No.1 of Xinjiang Huadian Hongyanchi Power Generation Corporation Limited . were introduced. The problems, which are encountered in upgrading the DCS using OC6000e, were analyzed. Based on the optimized upgrading, the best control effect was obtained by the reformed distributed control system of the unit No.1.

Reformation of bag filter for boiler No.1 of Shanghai Waigaoqiao Power Plant

ZHANG Liang

2011, 33(8): 58-61.

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In the Waigaoqiao Power Plant, using the overhaul opportunity, the original electrostatic precipitator of boiler No.1 was transformed into low pressure pulsetype long bag filter. The performance and structure of the bag filter were introduced. The automatic detection and protection of the bag filter, the filtering bag, the soot cleaning and the status of the bag filter before and after putting into operation were described. After the bag filter was put into operation, it operates stably, each index of its operation was well, and the requirement of flue gas emission was met.

Optimization of furnace safeguard supervision system of 200MW unit

DONG Maoliang

2011, 33(8): 62-66.

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The problems existing in original FSSS of the 200MW unit boiler of Huadian Energy Harbin Third Power Plant were introduced. According to analysis of the system and practice, the optimized solution was summarized and implemented; the operation reliability of the unit was enhanced further.
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Analysis on two peeling off faults of protective coat of demineralized water tank in condensate system

HUANG JIanxiong;ZHOU Yimin;YU Lifan

2011, 33(8): 67-69.

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The condensate system and abnormal process occurred in its operation were introduced. The functions and the requirements of the coat of the demineralized water tank were expounded. By listing practical examples, two peeling off faults of the protective coat of the demineralized water tank was analyzed. The abnormal problems were treated, and the healthy operation of the equipment was ensured.
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Optimization of operation mode of 600MW unit FGD system

SUN Puchun;YIN Minquan

2011, 33(8): 70-72.

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According to the operation situation of 600MW unit FGD system of Huadian International Zouxian Power Plant, the optimized energysaving mode with reduced electricity consumption, lime stone powder consumption and water consumption was analyzed. Based on optimal regulation and management of operation indicators competition, favorable effects were obtained.

Application of hydraulic jacking device in wet FGD reformation project

LI Youwei;DONG Changhui

2011, 33(8): 73-77.

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The application of the hydraulic jacking device in wet FGD reformation project was introduced. The selection of the hydraulic jacking device and the reverse erection method used in absorption tower reformation were described. Based on related calculation, the safety of the absorption tower jacking was proved.

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