Table of Content

25 December 2015, Volume 37 Issue 12

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A new type magnetic control reactor and its performance analysis

LI Xiaoming

2015, 37(12):  1-3. 

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Abstract:Existing self exciting magnetic control reactor is not suitable for extra high voltage electrical system.The paper raised a new type elf exciting magnetic control reactor for extra high voltage electrical system.The Simulink in Matlab was adopted to build the model and run the simulation.Analysis report indicated that this new type self exciting magnetic control reactor has same structure with exitingself exciting magnetic control reactors,its transient respond time is less than half of existing self exciting magnetic control reactors.Which is suitable
for extra high and ultra high electrical system.

Improvement of voltage switching circuit of JFZ-12B phase separated operation box

MA Yonghui，CHEN Jun，ZHANG Jianfeng

2015, 37(12):  4-6. 

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Abstract:JFZ phase separator operation box is widely used in the high voltage circuit breaker of the power plant.There occurred an accident that a 330kV bus protection failed to act in a certain power plant.The failure was analyzed and the results showed that it was the failure of the voltage switch that caused the accident.As for the problem of the voltage switch,new project was put forward. The project prevent the switches form secondary accidents caused by bad contacts effectively.

Effects of static excitation voltage filter circuit of generator rotor grounding protection devices

LI Yi, ZHANG Wenbin, LI Zhou, WANG Zhigao

2015, 37(12):  7-9. 

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Abstract:The theory of the injection square wave ground protection,PingPang ground protection,and excitation voltage filter for generator rotor were analyzed.The injection wave ground protection and PingPang ground protection were easily affected by the parameters of the excitation voltages. Based on the engineering projections,the effects of the.

Optimal design for coal sampling device through train handling

SUN Yong

2015, 37(12):  10-14. 

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Abstract:According to the problem cause by coal sampling device for QCZ-I train handling,this paper introduced a new method to handle this problem.This upgraded device was introduced from its overall structure,big and small car system,sampling system,and sample preparation system and its mechanical structure optimization.Practice shows that stability and reliability of this sampling device has been increased a lot.Also,this device provide accurate basis for monitoring coal quality.

The finite element analysis of the slag warehouse based on ANSYS software

MIAO Ruiling

2015, 37(12):  15-16. 

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Abstract:The support of the slag warehouse was taken as the research object.Then,the finite element analysis of the slag warehouse were built based on ANSYS.The support of the slag warehouse was analyzed by placing the load of the same situation of the power plant.Based on the results analyzed,the support of the slag warehouse was optimized,which made the equipment more safety and reliability.

Finite element analysis based on hydraulic pressure platform system structure for chimney by using ANSYS software

HU Ting1,LIANG Qingchun2,YAN Yuping3

2015, 37(12):  17-20. 

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Abstract:The structure of hydraulic pressure construction platform system for chimney is complex,and with high frequency indeterminate and varieties of loads.In order to simplified and assure the result of calculation,this paper adoptedfinite element analysis based on hydraulic pressure platform system structure by using ANSYS software to calculate strength and stiffness.It pointed out weakness of main structure of the platformand proposed a platform structure optimization,which made the calculation results of main structure of the platform meet regulatory requirements.

Research and application of an adaptive temperature wind energy saving technology of 300 MW coal burning boiler

LIU Yongjun，FENG Renhai

2015, 37(12):  21-24. 

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Abstract:In order to reduce the exhaust gases temperature of the No.7 boiler of the Huadian International Shiliquan Power Plant,to improve the thermal efficiency of the boiler,the modification technology of inputting cool air into the pulverized coal system ,which made the No.7 boiler unit save energy, automatically adjust the rate of the cooling air input quantity according to the power load, coal quality and other factors.With these technology reform, the input quantity of the cool air was great reduced,the temperature of the flue gases exhausted was decreased,which saves the energy,improve the boiler unit economic.

Measures to improve unit utilization rate

HUANG Haibo

2015, 37(12):  25-29. 

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Abstract:Both Hunan Huadian Changsha Power Plant Company Limited’s two units of 600 MW supercritical generators adopted generatortransformer unit connection mode.Generator transformer unit No.2 directly connects to 500 kV Shaping Substation.Due to lack of power source,
the grid is not stiff enough and existed many electromagnetic loops cannot open and operate.Hence,generating rate of unit No.2 was limited. With the fall of coal price,thermal power profit margin was increased.The competition of generation capacity between power companies became more and more serious.To outperform planned annual generation capacity, the measure of unit No.2 interconnect to the grid through the main transformer of unit No.1 was raised.To implement this,primary electrical system,surveillance system and unbuild interlock,sequential control synchronization and other related circuits were reconstructed.Unit utilization rate was increased.

Improvement of power signal circuit logic for gas turbine generator

PAN Yimin

2015, 37(12):  30-33. 

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Abstract:The circuit connections of potential transformer used by the three active transmitters at the outlet of E class gas turbine generator were the same set of coils voltage,and they were also lack of redundancy.Once primary or secondary circuit break happened in the potential transformer,it might lead to large fluctuations on output power signal values of the three active transmitters simultaneously.Furthermore,tripping accidents might occur.After a deep analysis and investigation of the above problem,the signal circuit and logic were improved.As a result,the lack of redundancy problem was solved,and the safety and reliability of equipment operation were improved as well.

Differentiation and solution of 6kV system grounding on one line and PT fuse failure

ZHANG Lei

2015, 37(12):  34-36. 

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Abstract:Modern large scale power plants with 6kV are mostly using neutral point ungrounded system.Some of operators are easy to make misjudgment of one line grounding and PT fuse failure.Based on the electrical principle and case study,this paper brought up two types of trouble shooting methods and the difference between this two types,which helps operators judging and handling obstacles are put forward.

Failure analysis and its treatments of 1000 MW ultra supercritical power unit

HUANG Yuzhong1, ZHANG Qi2

2015, 37(12):  37-40. 

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Abstract:Generator is one of the most important devices in power system and its safety is crucial to ensure the safe and stable operation of power grids.1000 MW ultra supercritical coalfired power unit is currently the largest unitin capacity and its generator is working at a high speed,high temperature,high voltage and large current state.Combining with the reasons of design,manufacture,installation,operation and systemfailure etc,the failures, such as the temperature increasing of generator stator,rotor core and winding,the insulation dropping of winding,the fever ignition of carbon brush,the overload or overvoltage of generator,and interturn short circuit etc.are occurredfrequently.Taking the 1000MW power unit as an example,this paper analyzed its failure reasons from the aspect of electric and proposed specific treatments to avoid or reducethe occurrence of similar failures.

Cause analysis of boiler water wall burst

JIA Shaowei

2015, 37(12):  41-43. 

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Abstract:The author adopted macroscopic test,spectral analysis,mechanical property test,metallographic examination and other methods,and analyzed the cause reasons of a power plant’s boiler water wall burst. Based on macroscopic test,we can find the trace of long-term and short term overheat at the burst hole area. And there are intensive parallel transverse crack at the fire face.Based on metallographic examination,the
transverse crack at fire face are thermal fatigue crack,the burst is caused by the aggravation of these thermal fatigue crack.The author suggested to find out what caused water wall thermal fatigue,and to replace those water wall pipe with thermal fatigue crack.

Hydrophobic optimization of cylinder body of G6.6-0.78 type boiler feed water pump turbine

LIU Wenhui

2015, 37(12):  44-44. 

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Abstract:Taking the second stage project of Datang Luoyang Shouyangshan Power Generation Company Limited.as an example,this paper discussed the water over standard phenomenon of lubricating oil in the G6.6-0.78 type boiler feed water pump turbine firstly.After that,it analyzed the leakage reason of front shaft seal and solved the problem through optimizing the hydrophobic mode of cylinder body and pipe from front shaft seal to the fifth low pressure stage,which improved the security and economy of equipment operation.

Analysis of the high back pressure circulating water heating solution of 350MW supercritical air cooling unit

LI Shanghua1,LI Hongsheng1,HAN Ling2

2015, 37(12):  45-46. 

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Abstract:With the development of urban construction,the heating area of Yining city,where is located in the severe cold region of western Xinjiang,is increasing annually.Therefore,the scattered small boilers heating mode is replaced by the cogeneration district heating mode gradually.For urban district heating,Ili Coal and Electricity Company Limited.plans to construct two 350MW cogeneration units and corresponding pipe network,which adopt the energy saving technology of high back pressure circulating water heating.The two units are working in peak shaving mode,which means when one unit is working in high back pressure heating mode,the other one is in extraction condensing mode.This paper introduced the high back pressure circulating water heating solution of 350MW supercritical air cooling unit and analyzed its feasibility.It considered that the solution could increase the heating ability and relieve the heating tense situation of Yining.

The Application of the coal electric procurement system in the coal fired power plant

WANG Yuchun

2015, 37(12):  47-49. 

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Abstract:Took the coal procurement of the branch enterprises of the Datang Group for example,the coal procurement modes were expounded based on the internet technologies in the coal enrichment areas of the Eerduoshi district.The characteristics of high efficiency,target,open and transparent were summarized.The problems that should be paid attention to were put forward,which provided the references for establishing
and perfecting the coal procurement mechanism of coal power plants.

The construction monitoring control of hammer penetration type prestressed high strength concrete (PHC) pipe piles in expansion areas

XU Zhengliang，LIN Xizhen

2015, 37(12):  50-51. 

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Abstract:Combining with engineering example,this paper introduced the construction measures,the construction monitoring methods and results of prestressed high strength concrete (PHC) pipe piles in expansion areas.After some monitoring methods,such as excess pore water pressure, deep soils displacement and pile head displacement etc.were adopted in the construction process to control the construction sequence and schedule,the response of earth squeezing from group pile and the impact on external area were controlled effectively,and the construction quality was guaranteed.

Treatment measures of the malfunction of power plant isolated network

PAN Wenliang

2015, 37(12):  52-54. 

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Abstract:A certain power plant set up two 220kV power line tripped at the same time,and caused isolated network operation.After diagnosing the problem of 220kV power line,the system runs again by following the system recovery method,and the buses of 220kV and auxiliary power are bake to service as well,which allows paralleling operation and guarantees the safety of host equipment.

A comparative analysis of soot ultra low emissions retrofit schemes of coal fired power plant

HU Yongfeng

2015, 37(12):  55-58. 

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Abstract:This paper introduced the current situation of fume dust removers in coal fired power plants in China,the national policies and requirements of ultra low emissions of coal fired units and the commonly used fume dust removal technology.After that,a comparative techno economic analysis of three soot ultra low emissions retrofit schemes were carried out,which are adopting high efficiency dust removal desulfurization tower,adding dust removal demister and adding wet electrical dust precipitator.Through comparison,the retrofit scheme of adopting high efficiency dust removal desulfurization tower is proved to be the most stable, reliable and the lowest cost one.

Application of economical start stop evaluation to power plants’ energy saving and cost reducing

WANG Bin

2015, 37(12):  59-60. 

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Abstract:Unit start stop is a special process that with high energy consumption.To lower the energy consumption while start stop,a company indicated a way to strengthen the unit energy consumption management by unit start stop energy saving evaluation.This paper provided detailed requirements and regulations for management measures,technical measures that evolved in start stop process.This included quantitative evaluation into energy saving evaluation of start stop process,and significantly reduced energy saving of start stop process.

 

 

Simulation analysis of electrical equipment in thermal power unitultra low emission reconstruction

HU Jianming, ZHI Jianping

2015, 37(12):  61-63. 

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Abstract:While Yangzhou No.2 Power Generation Company Limited’s ultra low emission reconstruction,to understand the performance characteristics of electrical equipment,ETAP software was applied to carry out load flow calculation,short circuit calculation,protection,motor starting and other kinds of analysis.Guidance of equipment selection,setting value adjustment and operation has been indicated.

Impact on angle stability of power system with doubly fed induction generators connected to grid

YU Canping, YU Weiwei, XIONG Jianqing, HUANG Ningji

2015, 37(12):  64-68. 

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Abstract:As a new generation mode,a large amount of the integrated doubly fed induction generators (DFIG) have an effect on the dynamic behaviors of the power system.With the installed capacity of DFIG based wind power increased,this impact on the power system stability is gradually emerging.In this paper,the theoretical analysis and simulation verification for the angle stability of the synchronous generator after the DFIG connected to the grid are studied from two aspects,one is reducing the synchronous generator output and the other is replacing the generators with the equally capacity DFIG.The results demonstrate that the DFIG connected to the system is benefit for the angle stability of synchronous generators to a certain extent.

Relation between gas price of building type gas for distributed energy project and energy selling price

YANG Zhu1，TIAN Guodong2，CHEN Zhifeng3

2015, 37(12):  69-72. 

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Abstract:Take a certain building type gas for distributed energy project as an example,this paper analyzed reasons like gas price,cooling price and heat price that would affect project economics,and get a linkage relation formula among gas price,cooling price and heat price,which could be taken as a consideration when it comes to adjustment of produce price and guarantee of project economics.