Table of Content

25 January 2016, Volume 38 Issue 1

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Research of one dimensional shielding calculationusing finite element method

ZHAO Jingchang，ZHANG Bin，CHEN Yixue

2016, 38(1):  1-4. 

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Abstract:In this paper,the shielding calculations of one dimensional plate and one dimensional sphericity using deterministic method were studied and a one dimensional steady state neutron transport calculation program DONTRAN1D using discrete S N finite element method (FEM) was developed.In the calculations,a virtual point setting method was proposed when processing the model boundary conditions.In addition,a zeroing modification and a neutron balance calculation using transporte quation were adopted for negative flux.At last,a comparative analysis was conducted between DONTRAN1D and other mature program in the world using calculation examples.The results show that the
solving accuracy of DONTRAN1D could be guaranteed well.Besides that,a mount of functional module interfaces were reserved for future development in DONTRAN1D program.



Realization of telecontrol channel for power plant rapid regulating system and its application in scale small hydropower stations group

XU Yutao1, WU Jinhui2, LIN Chenghui1, JIAO Shaohua2, GU Wei1, ZHAO Jiwei3, LONG QiuFeng1

2016, 38(1):  5-8. 

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Abstract:In order to stabilize the power grid fluctuation due to the grid connection of wind and photovoltaicenergies and realize the combined
operation of scale small hydropower stations group witha variety ofnew energies, this paper aimed at the characteristics of stability, adjustability
and rapid regulation of scale small hydropower stations group,developed an embedded controller integrating the rapid regulating functions of active power and reactive power for hydropower station,which could make small hydropower stations have the ability of power rapid regulation. In addition,in order to realize the closed loop control of scale small hydropower stations group according to the remote control strategies, a closed loop control telecontrol channelamong remote hoststation and hydropower stations must be built.Therefore,this paper proposed two solutions that based on the dispatching data network and wireless communication that taking the practical features of small hydropower station
into consideration. The demonstration plants shows that the power rapid regulating system and the closed loop control of scale small hydropower stations group was realized successfully.

Application of automatic generation control in gas and steam combined cycle power plant

XU Zhenhua

2016, 38(1):  9-12. 

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Abstract:Automatic generation control(AGC)has become increasingly important with the development of power industry.Based on a gas and steam combined cycle power plant in Malaysia,an AGC system had been designed.This paper introduces the control pattern of AGC system,load limit,load rate of change and design content of operation procedure of AGC.The practical application indicates that the application
effect of AGC system turns out good and meet the technical requirements of electric power control center.

The heat transfer and flow resistance characteristics of snake like finned tubes of air cooling unit at low wind speed in winter

ZOU Qingjiang1, LI Peng1, GUO Minchen2, LI Ansheng2

2016, 38(1):  13-17. 

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Abstract:In winter, the ambient temperature is relatively low and the fan below the direct air cooling condenser is forced to run at low flow rate or shutdown in order to prevent the finned tube bundlesfrozen under low heat load conditions. Therefore, it is necessary to study the heat transfer and flow resistance characteristics of finned tubesat low wind speed, as well as the air cooling system status under natural ventilation
condition. This paper simulated the influence rules of ambient temperature, wall temperature of finned tubes and inlet velocity of air to the velocity and temperature fields of finned tubes using Fluent, and built a driving force generation model of airflow for direct air cooling condenser under natural ventilation condition. On the basis of numerical simulation, this paper analyzed the heat transfer and flow resistance characteristics of single row snakelikefinned tubes, obtained the natural ventilation air flow rate under certain condition through the balance of the lift and drag, and calculated the corresponding heat transfer coefficient. It provided a reference for the optimization design of direct aircooling condenserthat operating at low wind speed.

A logic optimization for power control of control system of M701D gas turbine

ZHAO Junhua

2016, 38(1):  18-21. 

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Abstract:Based on the fact that a trip failure occurred to a M701D gas turbine,this paper concludes that the cause of this failure is because the potential transformer is inconsistent with original design on the actual wiring and the logic of power control of turbine control system (TCS) is unreasonable.To overcome this problem,this paper suggests to take action by reconnecting,adding power controller and optimizing logic of TCS.After these modification,under the circumstances that each power transmitter and TCS are consistent on channel and adopted value,and one or three phase of fuse of power transmitter is fusing,the result showed that the logic of TCS is calculated correctly,which effectively improved circuit fault of control system.

Controlsystem design analysis of coalfired power plant in heating transformation of condensing power unit

LIU Bing1, GAI Dongfei2

2016, 38(1):  22-24. 

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Abstract:In coal fired power plants,the economic benefits of medium and small sized condensing power units are not as ideal as expected due to existing problems,such as low efficiency,high coal consumption and large scale pollution etc.In addition to the shutdown of medium and small sized cogeneration units,the formed heating gap is in urgent needsto be filled.Therefore,a large number of condensing power units has been transformed to extraction condensing cogeneration units gradually in recent years in order to meet the changing situation.Taking the 2×225 MW+2×300 MW units of a certain power plant as an example and aiming at the problems that exist in the heating transformation of subcritical condensing power units,this paper analyzed the design of control system and control logic and provided corresponding recommendations.

The design of the electric synchronous system of 2×1000 kN trolley type hoist  

XIE Haijian1,WANG Jidong2,GAO Jinming1

2016, 38(1):  25-27. 

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Abstract:Taking 2×1000kN platform hoist at Xijiang Changzhou hub ship lock project for example, the method how to use absolute value encoder, Siemens S120 inverter and Siemens S7-300 PLC to realize electrical synchronization with double lifting point of platform hoist was introduced in this paper.The synchronous system save the project cost,make the manual more flexible,simple and reliable.

600 MW boiler air pre heater on line water wash

WANG Weinian

2016, 38(1):  28-31. 

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Abstract:This paper analyzed the necessity of water wash to boiler air pre heater and feasibility of on line water wash,indicated
two methods to water wash air pre heater,and descried the process of air pre heater on line water wash.The operation parameter and waste water parameter indicated that water wash is effective and secured the safety and stability of unit operation.

Analysis and treatment for seal cast back problem of ball valve

WU Jinrong,WANG Jun

2016, 38(1):  32-35. 

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Abstract:Two ball valves with diameter 1720 mm were installed in Fujian Muyangxi Zhouning Hydropower Station.The overall operation of No.2 ball valve run well when it was first put into use,while seal cast back problem which affected automatic boot occurred at later stage.After analysis,the main reasons were seal damage and congenital design deficiency.The problems were solved by modifying the open process of No.2 ball valve,replacing the three D type seal and redesigning the package D type sealing packing.

Failure cause and treatment of 600 MW unit steam pump booster pump

MU Xiaojing

2016, 38(1):  36-38. 

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Abstract:After years of operation,many defects appeared on the booster pump of Huaneng Tongchuan Zhaojin Power Plant,such as abrasion of pump cover interface,serious axial movement while low load,damage of bearings,leakage of mechanical sealed cooling jacket and etc.After analyzation,solutions and suggestions to those defects was indicated,which are effective to improve the unit operation.

Estimate of 600 MW generator rotor turn to turn short circuit

 

YANG Qunfa, WANG Dongya, SHEN Wenhua

2016, 38(1):  39-41. 

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Abstract:While Guangdong Zhuhai Jinwan Power Plant Company Limited No.3 unit overhauling,site test found there is trace of turn to turn short circuit at rotor winding.Turn to turn short circuit was determined by two pole voltage balance test.Winding alternating voltage distribution test determined the coil with failure.After the rotor was sent back to factory to repair, failure was analyzed and repaired.The overhaul duration was secured.

Analysis of generator outage caused by HV plant transformer LV side non segregated busbar failure

QIN Zhuoxin

2016, 38(1):  42-44. 

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Abstract:The author studied on a generator outage,which caused by plant transformer LV side non segregated enclosed busbar failure.Based on the treatment of this accident and record analysis,the author indicated that the direct reason of this accident is the enclosure of LV side non segregated busbar was not well sealed,and insulator was damped.This paper also included the preventive measurement based on aspects of operation and equipment maintenance.

2×150MW generator ends winding loose and corona treatment

HUANG Yijin

2016, 38(1):  47-48. 

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Abstract:Panzhihua Power Plant 2×150 MW generator stator winding end part bearing fixing structure,lashing rope and a support ring and
supporting plate loosening effect,stator winding surface potential distribution is not uniform,in the high voltage,resulting in the big local potential gradient winding end part fixed and banding of tip and burr discharge phenomenon.In order to improve the life safety operation of generator, generator stator end winding were processed,and used the Harbin motor factory research obtains the reliable anti corona technology and anti corona treatment experience of winding of corona treatment,to take measures and through long-term monitoring on line partial discharge monitoring of generator stator winding insulation,can timely evaluation the state of generator stator winding fault,found early signs of early,to avoid the occurrence of accidents.After four years of operation,has achieved remarkable results.

Reason analysis and preventive measures of tripping caused by 600 MW steam turbine fuel injection test

ZHANG Xuehai

2016, 38(1):  47-48. 

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Abstract:The process and principles of the injection test of a 600 MW steam turbine were introduced in this paper.Taking the tripping accident of turbine caused by the injection test for example,the causes were confirmed,the jam of the electromagnetic valve and the logic blocking of the DEH tripping were main reasons for the accident.Through the analysis above,preventive measures were put forward,which provided a good
guidance to prevent the failure of units akin to the above.

The reasonable application of frequency converter in coal fired power plant

CHEN Lixin,SUN Jianbang,CHEN Rui

2016, 38(1):  49-50. 

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Abstract:In order to achieve the goal of saving energy and reducing consumption of 300 MW coal fired unit,additional frequency converter was installed on auxiliary electric motor in a certain power plant.After the installation,a tracking analysis of equipment running status was conducted and the corresponding treatment methods of problems occurred were given in this paper,which provided a reference for the energy saving and consumption reducing work of similar units.

Economy improvement analysis during hot start of 6FA gas turbine combined cycle unit

TANG Mingfeng, WU Minjie

2016, 38(1):  51-53. 

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Abstract:To reduce the gas consumption of natural gas during the host start of combined cycle unit and improve the economy of plant operation,several measures such as appropriate impulse starting parameter and reference datum selection,as well as the cylinder temperature reduction are performed to achieve lower plant operation costs.After optimization,the gas consumption during hot start has a significant descent and the plant operation has obvious economic benefits.

Domestic 600MW supercritical coalfired unit “near zero emission” reconstruction

YIN Pengfei

2016, 38(1):  54-58. 

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Abstract:To realize “near zero emission”,Guangdong Zhuhai Jinwan Power Plant Company Limited’s No.3 and No.4 unit took reconstruction. This paper introduced the reconstruction of desulfurization system,adding wet ESP(electrical precipitator),classification of economizer,denitration system adding catalyst,combination of duct fan and booster fan. After reconstruction,the emission concentration of dust,SO2 and NOx is lower than gas turbine unit, “near zero” emission was realized.

Low NOx combustion retrofit of boilerand its effect analysis for 330MW power unit

FAN Aibing

2016, 38(1):  59-61. 

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Abstract:The NOx emission concentration of an air preheater is up to 655.7mg/m­­­­­­­³  for the No.6 unit of a certain power plant.In order to meet the emission requirement of new standard,a low NOx combustion retrofit of boiler burners conducted using a multi air stereo staged and horizontal bias coal combustion technology,which carries out a multi air stereo staged combustion along the vertical direction and horizontal direction in the chamber of a stove.The performance test of the retrofitted boiler shows that the retrofit effect is significant with the NOx emission concentration of an air preheater could be kept below 300mg/m­­­­­­­³ for a long time,and the boiler efficiency and combustible matter content in flue dust are also meeting the requirements.

The application of selective non catalytic reduction denitration technology in garbage incineration power plant

ZHANG Hui

2016, 38(1):  62-63. 

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Abstract:SNCR is characteristic of a shortterm construction, minor investment and medium efficiency for denitration, which is fit for the medium scale or smal scale power plant,especially the waste incineration plant.Combined with the examples,the theory for the SCNR was introduced.The cases that should be paid more attention to are put forward.The conclusion are draw that SNCR technology,together with other denitration technologies can drop the NOx emissions at the low investment.

Failure analysis and design optimization of non metallic expansion joint at inlet duct of denitrification device

WANG Sen1,AN Hong2,ZHU Bin2,WANG Shushan2

2016, 38(1):  64-67. 

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Abstract:Some faults are existed in the non metallic expansion joint at inlet duct of denitrification device for a certain 1000MW power unit,such as the lower skin cracking and serious deformation of flange etc.Through the analysis,the failure reason is considered as the unreasonable structure design of double wave type middle flange hinge of expansion joint.In this paper,the original expansion joint was replaced by single wave structural non metallic expansion joint,and some structural optimizations of expansion joint frame,thermal protective coating and skin were also conducted.More than two years of operation shows that the expansion joint works well and the surface temperature is less than 50℃ under full load condition.

Simulation analysis of small break loss of coolant accident of AP1000 power unit

CHEN Jie, ZHOU Tao, LIU Liang, LI Yu

2016, 38(1):  68-71. 

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Abstract:Using the nuclear accident simulation software PCTRAN of MST Company, this paper carried out a transient curve analysis of small break loss of coolant accident (SBLOCA) of AP1000 power unit.The simulation results are as follows:After the occurrence of 400 cm² SBLOCA of AP1000 power unit,the water levels of makeup tank and safety injection tank of reactor core fall with the pressure decrease of reactor system. When the pressure drops to 13.09 MPa,the heat exchanger of passive residual heat removal system is triggered to remove the residual heat of reactor core.When the pressure continues to drop to  1.52 MPa,the water level of reactor core begins to rise.After the pressure reaches to 0.29MPa,it begins to be stabilizing.The calculated system pressure is in concordance with the results that obtained using the software NOTRUMP by Westinghouse Corporation in time and number.

Anemometer monitoring method based on adjacent wind turbines correlation model

WU Lizeng

2016, 38(1):  72-75. 

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Abstract:It has important significance for realtime monitoring of wind turbine anemometer due to its high failure probability.This paper proposed an anemometer monitoring method based on adjacent wind turbines correlation model for the high correlation of operation conditions and measured values of anemometers among adjacent wind turbines.This paper processed the normal measured data of anemometers of adjacent wind turbines using particle swarm optimization (PSO) algorithm and built a correlation model.In this model,the realtime measured wind velocities of anemometers are considered as the inputs.When a certain wind turbine anemometer is abnormal,the correlation among adjacent wind turbines is destroyed and the predicted residual of the certain wind turbine anemometer will increase significantly,which indicates that anemometer may have a fault. Hence this method could realize the realtime monitoring of anemometer.The practical operation data of a certain wind farm verified the effectiveness of this method.