Integrated Intelligent Energy

The problems occurred in commissioning of 660MW ultrasupercritical unit electric system and its countermeasures

WANG Shibo;JING Xucheng;XUE Fei;YU Wentao

2009, 31(3): 1-4.

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This paper roundly introduces the design of electric system and main equipments lectotype features of 2×660MW ultrasupercritical unit in Anhui Huadian Wuhu Electric Power Corporation Limited Firstterm Project，concurrently aiming at the merits & demerits of this design scenario and problems occurred in commissioning，several advices which should be noticed were proposed for the forthcoming design and working.

Analysis of startup through IP cylinder and its fault treatment for 600MW supercritical unit

HE Hui;WU Qiang

2009, 31(3): 5-8.

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The process and features of startup through intermediate pressure（IP）cylinder of two 600MW units in some power plant project phase I were presented.The faults occurred in the process of startup through IP cylinder were analyzed in detail, and the relevant treatment measures were proposed. At last, it was pointed out that the tartup through IP cylinder is a safer and more economic way for unit startup.

Reformation of starting system of 600MW supercritical oncethrough boiler

ZHANG Baoguo

2009, 31(3): 9-10.

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In this paper the design features of the starting system of 600MW supercritical boiler with boiler circulating pump were introduced, the related advantages and disadvantages in the design were pointing out. A design reformation method was proposed, in which the boiler circulating pump was eliminated and the feedwater heat regenerative was used to recovery heat and working medium,the initial investment and maintenance cost were decreased due to the reformation.

Countermeasures for ashconveyor faults treatment by destructing water seal in 600MW supercritical boiler

LIU Xiaojun;XIAO Lizheng

2009, 31(3): 11-13.

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For the 600MW supercritical units with boiler with dryash furnace of Huaian Xiangfan Power Generation Corporation Limited,there are no slag well and shut down valve at the furnace bottom, the water seal at the bottom has to be destroyed and the slag has to be discharged when the ashconveyor was breakdown, otherwise the boiler has to be shutdown for overhauls. Summing up the experiences and lessons of the former failures, the counter measures were developed, it has been avoided to boiler overtemperature and MFT in the ashconveyor faults.

Deformation control in assembling and welding of ultra supercritical unit low pressure cylinder

LIU Hongguo

2009, 31(3): 14-17.

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The low pressure cylinder of ultra supercritical unit in Yuhuan Power Plant of China Huaneng Group has larger contour structure size.By adopting rationale method and scientific welding process: CO2 gasshield welding + synchronous section backwards welding process, the deformation in assembling and welding of low pressure cylinder was controlled effectively, the deformation values were smaller than the design values. This experience could be a useful reference for the assembling and welding of other ultra supercritical unit.

Principal and application of slight oil ignition device

HU Mingjun;LI Fengde

2009, 31(3): 18-21.

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The principle of work of slight oil ignition device is introduced. The main technological parameters, the system structure and main devices were expounded elaborately. Based on these, the analysis and calculation for economic benefit were carried out. The application of this technique brought a fuel saving ratio above 90%, comprehensive energysaving benefit about 80%, cost saving more then 2 million yuan (RMB), the upstanding results have been obtained in economy and social effects.

Reasons analysis and improvement for pipe bundle leakage in waste heat boiler of S109FA gas turbine

ZHU Chenxi;HUANG Wanli;SI Baoxiang

2009, 31(3): 22-26.

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The structure characteristics of waste heat boiler exchange module in S109FA gas turbine combined cycle units were introduced. Based on the mechanism of damage, design of pipe bundle, influence of operation conditions, quality of welding, the damage reasons of the middle header outlet tube in the left of the high-pressure superheater 2 were analyzed. The purpose of protecting the pipe bundle from leakage was reached by improving the structure, welding process and optimum operation.

The field test of high speed balance of turbogenerator set

NIU Xueling

2009, 31(3): 27-29.

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In Thermal Power Plant of Power Division of Guangzhou Branch of China Petroleum&Chemical Group, the vibrations of No.3 and No.4 shafts of No.1 turbogenerator set were higher and influenced the unit’s safety operation. After field test of high speed balance by double balance method, obvious effect has been obtained, the shaft vibration values have reached favorable level. The experiment method can be considered as a reference to check and treat faults for unit’s safe operation.

Application of automatic voltagevar control system in fuel gas power plant

WANG Xiabin

2009, 31(3): 30-32.

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The automatic voltagevar control system(AVC) which was newly used in Guangdong Huizhou Liquefied Natural Gas Power Corporation Limited is the first experimental unit project of China Southern Power Grid. The running mode, the adjustment principle, the logic composing of the AVC automatism equipment and the communication among systems was introduced in this article. The electric power system voltage and the reactive power reserve were held in rather higher level through the application of the AVC system. The security of the power grid and the stability of the generator set were greatly improved.

Application of industrial Ethernet in power plant

BAI Guohua;JIA Jingchen

2009, 31(3): 33-37.

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The development of Ethernet was introduced. The redundancy, openness, extensibility and reliability of Ethernet were analyzed. Based on this, the application of industrial Ethernet in Zouxian Power Plant of Huadian International Corporation Limited Phase IV Project was described in detail. The description shows that automation level of power plant is raised greatly by application of Ethernet in thermal power plant, and a good result is obtained.

Design and application of multiaxial jetgrouting impervious wall in the reinforcement project

ZHANG Wei

2009, 31(3): 38-40.

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Multiaxial jetgrouting impervious wall is a new vertical seepage prevention technique developed on the basis of multiheader paddling pile technique which has advantages of higher work efficiency, lower construction cost, complete wall body and good continuity, and is dam seepage prevention technique worthy to be generalized. The application of this technique in the reinforcement project of south segment of Hanjiang NorthSouth Dam in Chaozhou City, Guangdong Province was introduced, the selection process of design scheme and the construction of experimental section were analyzed. The result of the scheme was excellent.

Exploration on largecapacity units in charge of frequency regulation of small grid

HUANG Chunzhong;CHEN Fajun

2009, 31(3): 41-44.

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As a specialty goods, productionsupplydistribution of electric energy should be completed simultaneously and kept balance, otherwise the quality of electric energy, safety and stability of grid system operation would be influenced. Therefore it is necessary to regulate and control the frequency and voltage of generator units. The problems presented in largecapacity units taking responds for frequency regulation of small regional power grid were explored to provide the reference for persons in the same business.

Principle of TXP distributed control system and upgrading

SHI Gang;SHANG Jun

2009, 31(3): 45-47.

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According to the operating principle of control system, some problems occurred at operation of SIEMENS TXP distributed control system in Yangzhou Second Power Generation Corporation Limited were analyzed. The control system were reformed and upgraded, and some regulating measures were adopted. After upgrading, the control system tends to be steady, and failure rate was lowered obviously.

Analysis and handling of generator stator Bphase grounding faults

XU Yongsheng

2009, 31(3): 48-51.

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The main technical parameters and stator winding of generator No.2 of Zilanba Hydropower Station were introduced. The reasons of stator Bphase grounding fault were analyzed. The method for locating the fault points, the resolving process and resolving method of the fault were discussed. Combining with field practical situation, four measures for generator stator maintenance were proposed.

Discussion of crude oil back pressure regulating and frequency conversion control

XU Jinlei

2009, 31(3): 52-53.

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The function of premodule crude oil back pressure regulating valve is to satisfy the requirements of flow rate and pressure of crude oil for fuel selecting module by adjusting the bypass oil flow from crude frontmounted pump outlet. Because the control pipe is so petty that blockage is easy to occur,there were some other faults, such as membrane aged and broken, pressure unsteady, etc. in the system. So the reformation was carried out in 2007, the regulating valves was backout, frequency conversion control was used for fuel flow rate adjusting. Two altering way reformation scheme were introduced and their advantages and disadvantages were analyzed, and the existing problems were pointed out in this paper.

Discussion on reform of the transformer in hydropower station

ZHENG Zhenfen;ZHAO Jianjun

2009, 31(3): 54-55.

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Following the change of time and technical measures, some hidden troubles in the hydropower station transformer, such as the malpractices and its harmful aftermath in the main connection mode and the transformer operation, and the overtension of the terminal voltage and the auxiliary power, were emerged, it is necessary to reform aiming at deferent status. This paper analyzed the reform reasons of the hydropower station transformer, and proposed the optimum reform plan.

Safeguard measures of installation quality for air cooling system

HAN Jun

2009, 31(3): 56-58.

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The composition of air cooling system was expatiated, and its installation process was summarized and analyzed for insuring the successful execution of the air pressure experiment. Aiming at the critical process problems in installation, the related countermeasures were adopted to guarantee the installation quality. The experience can be as a reference for air cooling island construction later on.

Discussion on safety management of network and important information system

HUANG Liwen

2009, 31(3): 59-61.

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Summing up the experiences of electric power enterprise informationization, some demerits were discovered by network and important information system safety examination, and their causes were analyzed. A series of feasible suggestions and methods was put forward to make safety management of network and important information system of electric power enterprise a further step.

Analysis and treatment of power frequency interference inducing microcomputer based protection misoperation

GUO Libin;YAO Qingrong

2009, 31(3): 62-64.

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In combination with the investigation and analysis for a misoperation of microcomputer based protection, the troubleshooting process and cause analysis were described, the conclusion has been drawn that AC powerfrequency interference caused protection misoperation, which may provide a reference for analysis and reduction of AC powerfrequency interference hereafter.

Analysis of disconnecting switch misoperation caused by earthing of its control circuit

CHEN Xiaolong

2009, 31(3): 65-66.

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Now electric disconnector were applied in all modern substations, combining with FivePrevention Interlocking System to get safety and convenience as well as relieving labor intensity, but potential safety hazards would exist if the design for the control circuit of motordriven disconnecting switch was unreasonable. The disconnecting switch misoperation was happened due to earthing of its operation circuit when the disconnecting switch was installed in a line. This case was analyzed and the solving measures were put forward in this paper.

Application of transducer on thickener operation control

SU Quanwei;ZHANG Yan

2009, 31(3): 67-68.

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Adopting transducer to control the driving motor of thickener, the stepless speed regulation of motor can realized easily for accuracy controlling output slurry concentration from thickener. The application of wattmeter in control system can monitor current change of driving motor operation of thickener, thereby making the driving motor of rake lift action, rake lifting and protecting the machine from filled up.

Reformation of main transformer cooling mode and effect analysis

CHENG Qiang;WANG Yong

2009, 31(3): 69-72.

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The necessity of main transformer cooling mode reformation was expounded. The heat dissipation effect was analyzed. The numerous operation data after reformation were collected. The practical oil temperature rise of top layer was compared with theoretic calculation results, which shows that the reformation was effective.

The response for change of sulfur content rate of coal in FGD design

PENG Bin;WANG Kailiang;TAO Aiping;WANG Yun;ZENG Hui

2009, 31(3): 73-75.

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At present, the sulfur content of coal in the actual operation of limestonegypsum wet desulphurization system is often far greater than the design value, which leads to the bypass opening operation because of the limitation of adaptive capacity for changes of sulfur content rate. In this paper, improving the design margin to suit the possible changes in sulfur content rate of coal was proposed for new projects. Searching for the optimal scheme by technoeconomic comparison based on local conditions was suggested for renovation projects explained by the real project.

Measures for optimizing combustion to reducing NOx emission concentration of boiler

JIA Zichen;XU Xingke

2009, 31(3): 76-80.

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The reasons of higher NOx concentration emission of two 670t/h pulverized coal fired boilers in Shengli Power Generation Plant of Shengli Petroleum Administration of phase 1 were analyzed. The process of dramatic reducing NOx concentration by optimizing combustion was introduced. After jet burner changing to "horizontal bias air combustion pulverized coal burner", and then staging air and staging powder transfer to optimize combustion, the decreasing amplitude of concentration NOx emission reached to 40%, the obviously effect in reducing boiler NOx emission was gained.

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