Integrated Intelligent Energy

Forming reasons of oxide skin in supercritical/ultrasupercritical unit and preventive measures

FAN Wenbiao

2011, 33(3): 1-4.

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The forming mechanism of the oxide skin in supercritical/ultrasupercritical unit and the main conditions of the oxide skin dropping in the inner wall of the superheater and the reheater were introduced. The main harms of the oxide skin were expounded. The relations between the oxide forming and the unit operation mode, the system configuration and the material selection were analyzed. The measures for preventing the oxide skin in periods of design, commissioning and operation were put forward.

Technical characteristics of acoustic pyrometry and its application in 1000MW ultrasupercritical boiler

CHEN Qin;YANG Quan;SHU Maolong

2011, 33(3): 5-7.

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The furnace temperature is a key parameter for control of combustion process. The basic theory and characteristics of the acoustic pyrometry system were introduced， and its first application in domestic 1000MW ultrasupercritical boiler and common problems were analyzed. The results can be used as reference for application of this technology in other ultrasupercritical units.

Research for cold aerodynamic field of supercritical oncethrough boiler

WANG Chaoyang;CUI Yukui;

2011, 33(3): 8-10.

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Contrapose the temperature deviations widely existing in horizontal flue of tangentially fired furnaces, the cold state aerodynamic test has been conducted in the newlybuilt boiler of Hebei Guohua Dingzhou Power Engineering Corporation Limited, the research focused on the flue gas distribution of the furnace outlet. The experiment has shown that through adjusting the angle of separated overfired air (SOFA) nozzle, the flue gas distribution of the furnace outlet can be improved effectively, guarantee homogeneous speed between right and left flue gas, and meet the demand of normal operation.

Commissioning and acceptance of supercritical power unit simulator

LIU Jianghua

2011, 33(3): 11-13.

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Contrapose the existing problems in simulator application, taking the commissioning and acceptance of domestic 600MW supercritical power unit simulator of Guangdong Datang International Chaozhou Power Corporation Limited as a example, from the local part of the simulator and distributed control system, also in the point of view of power plant, the simulator commissioning and check and acceptance were discussed, the main commissioning process, debugging about faults, check and acceptance procedures, and key points for the simulator were indicated. Training the operation personnel by use of the simulator before and after unit operation will have realistic meaning for rising allround operating ability and technical level.

Application of power plant information realtime database system in 1000MW unit

WU Xiangtao;LIU Jianrong;HE Hui;ZHEN Wei

2011, 33(3): 14-15.

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The power plant information (PI) realtime database system is necessary for the management layer of the power enterprise to analyze and optimize the production data for enhancing the enterprise competitive capacity. Combining with the application of the PI realtime database system in Zouxian Power Plant, the related problems of the system in installation and debugging were expounded.

Modeling and aerodynamic characteristics calculation of circulating water cooling tower in 300MW thermal power plant

PAN Wenrui;REN Jianxing;WENG Jianhua;ZENG Xianping

2011, 33(3): 16-19.

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The circulating water temperature is an important index for ensuring good vacuum of condenser and reducing the energy consumption of unit. If the circulating water temperature decreased by 1℃, the vacuum of the condenser would increase by 400～500Pa, and the unit coal consumption would decrease by 1.0～1.5g/(kW·h). As an important equipment of circulating cooling system in thermal power plant, the cooling effect of cooling tower is the key factor influencing on circulating water temperature. Based on the consideration of enhancing the cooling effect of cooling tower, taking the hyperbolic wet cooling tower with natural convection in 300MW thermal power plant as prototype, a simulating test device for circulating cooling system was designed and built. The calculation of aerodynamic characteristics for the model tower was carried out to realize the purpose of simulating the internal flow of the cooling tower and evaluating the cooling effect in 300MW thermal power plant to some extent.

The method of shafts alignment of a turbogenerator set

HUANG Guoqiang

2011, 33(3): 20-23.

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Shafts alignment is the most important procedure in a turbogenerator set installation, which is related with the safety, stability and operation economy of units. The right method and procedure for aligning the shafts of turbogenerator set are the key guarantee to successfully install. This paper introduced the correlation method and procedure for shafts alignment, and the relating matters needed to pay attention were pointed out.

Reasons analysis on of T92 steel pipe bursting of high temperature superheater

DONG Hongnian

2011, 33(3): 24-28.

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The T92 steel outlet pipe of high temperature superheater of a power plant bursted. The normal temperature tensile test and the high temperature tensile test for the cracked pipe and six pipes around the cracked pipe were carried out respectively. Combining with the practical site situation and through comparison and analysis of test results, the real reasons of this pipe crack accident were investigated, and relevant measures were proposed for preventing the pipe crack occurring once again.

Inspection of pipe bends of power plant boiler using ultrasonic phased array technology

YU Daoguo

2011, 33(3): 29-30.

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In the periodical inspection of the connecting pipe bend from economizer to steam drum, it was found that the reflection signal exceeds the specified value. Using A scan pulse echo technology, the flaw echo could be found, but the exact defect information could not be judged. Using the TOFD technique to recheck, the defect could not be detected. When using the ultrasonic wave phased array method, the defect was detected easily. Based on the detection results of ultrasonic wave phased array method, the exact defect information could be obtained.

Analysis on faults of FZ1-2A rotary tipper system and its treatment

YANG Zhangang;BI Yunying;ZHANG Chao

2011, 33(3): 31-34.

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The operation flow process and general circumstance of the two wagon tippers of Tianjin Chentang Thermoelectric Corporation Limited. were introduced. The main problems occurred in operation were analyzed, and the reformation scheme was put forward. Presently the reformed wagon tipper system is in good operation condition, and ensures the system running has safely and stability. 
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Barcode identification technology of concrete mixingbuilding installation unit and its application

MA Bin

2011, 33(3): 35-37.

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Combining with the characteristics of barcode identification technology，the research put emphasis on the method to use this technology instead of the old numbering mode in the concrete mixing building installation and pull down, a set of suitable process flow for enterprise to use was designed, a specific operation rule was formulated.

Automatic generation control strategy based on control performance standard

ZHANG Zhixiong;YANG Ping

2011, 33(3): 38-40.

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Under the control performance standard (CPS), automatic electric power generation control strategies mainly include two schemes: one is adjustment mode of original scheme, another is newdesigned mode based on new standards. The adjustment mode is useful for the transition from old standard to new standard, the newdesigned mode places extra emphasis on implementation of CPS. Each of them has own specialty and relevant scope of application; and the development prospects of the two strategies are also different. 

Analysis on problems of 300MW unit occurred during early period of production and optimized operation

CHEN Lizhi

2011, 33(3): 41-44.

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The problems of two 300MW thermal power generating and heat providing units of Huadian Harbin Thermal Power Corporation Limited occurred in commission and operation during early period of production were analyzed. Some devices of the units were reformed rationally, and the operation mode was improved reasonably, so the security and the economical efficiency of the units were raised. 
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Technical reformation of dualbackpressure condenser vacuumpumping system

ZENG Hua

2011, 33(3): 45-47.

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Using the dualbackpressure condenser vacuumpumping system, the average vacuity of the dualbackpressure condenser can achieve designed value, and the consumption of auxiliary power can be reduced in large amplitude. If the singlemain piping vacuumpumping system of 600MW unit is transformed into dualmail piping doublesuction vacuumpumping system, its average vacuity can increase 0.7245kPa, and the coal consumption can be reduced by 4284.755t each year. If the dualmain piping singlesuction vacuumpumping system of 600MW unit is transformed into dualmail piping doublesuction vacuumpumping system, one vacuum pump can reduce the auxiliary power consumption by 621997kW·h each year. The economic benefits and the social effects of the technical reformation of the dualpressure condenser vacuum pumping system are notable.

Selection of bypass mode for the motor frequency converter of thermal power plants

ZHANG Xiaobing

2011, 33(3): 48-49.

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The movement process of different bypass switchover modes for auxiliary motor frequency converter of thermal power plant were introduced, it was analyzed that the influences on operating conditions of pump motor frequency converter and fan motor frequency converter by automatic and manual bypass switchover modes, which can be for a reference when other power plants transform motor frequency control.

Reformation of condenser of 300MW unit

WU Baohua;LIU Hui;LIU Bin

2011, 33(3): 50-51.

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Combining with practical reformation of a power plant, the leakage reasons of the condenser copper pipe were analyzed. The feasibility of selecting the stainless steel pipe as cooling pipe of condenser was discussed, which provides certain reference for condenser reformation of thermal power units.
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Treatment of the frequent action fault of the emergency steam trap valve in low pressure heater

LI Xingmin

2011, 33(3): 52-54.

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The emergency steam trap valve of low pressure(LP) heater number 8B of unit number 5 in Huadian International Zouxian Power Plant was frequently acted under condition of high load, and this bring unfavorable influence on safety and economical operation of the unit. The reason of the fault was investigated. It is found by the investigation that the spring of regulating valve, which is installed in the normal drain pipe from LP heater number 6 to LP heater number 7A, was broken, and this caused the quantity of drain water in B side of LP heater system is larger than that in A side, and further caused the emergency steam trap valve of LP heater number 8B to act frequently. After the spring and the sealing ring were replaced, the emergency steam trap valve no longer acts frequently.

Treatment of leakage in middle surface flange of high pressure heater

DUAN Jipeng

2011, 33(3): 55-56.

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The reasons of leakage in middle surface flange of the high pressure heater in Xinjiang Baicheng Power Plant were analyzed. The method and concrete requirements for treating the groove in joint face of the middle surface flange were given in detail. The leakage in the middle surface flange was solved effectively.

Method for improving effects of equipment overhaul in power plants

LI Aimin

2011, 33(3): 57-59.

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Aiming at the dissatisfactory overhaul effects of power plant at present, the problems in some aspects, such as the personnel quality, the construction scheme, the construction organization, the configuration of machines and tools, the overhaul management mechanism and the equipment research groundwork, were analyzed. The relevant countermeasures were put forward, which may provide reference for power plants to improve their equipments overhaul.

Measurement and adjustment for total axial drifting value and working clearance of CHTC5/5SP2 feed pump

HUANG Xianhua

2011, 33(3): 60-61.

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The measurement and adjustment of total axial drifting value and working clearance of feed pump are the important links in feed pump overhaul; and its basic purpose is to make the feed pump impeller to be always in accordance with the center position of the guide vane slot and avoid the friction between the rotating part and the static part of the pump; which will be helpful to enhancing the pump efficiency. According to the equilibrium principle of feed pump, starting from the measurement and adjustment of the axial thrust, combining with the practical working experience, the problems on enhancing the feed pump overhaul quality were expounded. 

Application of virtual instrument in power plant

YU Lifan

2011, 33(3): 62-63.

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The definition and the characteristics of the virtual instrument were introduced, and the reason of probation of the virtual instruments in power plant was explained. When the virtual USB oscilloscope is used directly, some difficulties exist in reading and analysis; and the probation example of the oscilloscope after improvement and the matters needing attention were given.

Integrally replacing method of heat pipe type air preheater

HOU Zhicheng

2011, 33(3): 64-66.

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Some problems, such as the serious wear, the decreased heat exchange efficiency and the increased air leakage, existed in heat pipe type air preheater of boiler No.7 of Tianjin Junliangcheng Power Generation Corporation Limited. The construction technical scheme for integrally replacing the heat pipe type air preheater and relevant safety precautions were introduced in detail. The comparison of the test data after replacing with that before replacing indicates that after the heat pipe type air preheater had been replaced, the operation situation was obviously improved, and the prospective effect was achieved. 

Main points of Quality control for thermal power plant construction

GUO Zhijian;WEN Zhihua

2011, 33(3): 67-68.

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The power plant construction quality directly affects the safety, stability and operation economy of units，energy conservation, environment protection and the service life after the unit putting into operation. Aiming at the construction characteristics of thermal power projects, the key points for construction quality control about the civil engineering, boiler, steam turbine, electric, thermal control system and weld, etc. were expounded and summarized, expecting to give same reference for thermal power plant construction.

NO_xemission control technology in boiler and its application

CAO Dinghua;LIU Haiyang

2011, 33(3): 69-72.

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The control for the pollutants emission from power plant by the government is becoming more and more stringent. Under the premises of boiler combustion stability and the high combustion efficiency, it is very important to control the NO_x emission. The generative mechanisms of the NO_x were introduced. The influences of the burners with different structure on the NO_x analyzed. The application of the NO_x restraining technology in Inner Mongolia Huadian Baotou Power Generation Corporation Limited was expounded.

The improvement for the limestone slurry agitator base in desulfurization system of 600MW supercritical unit

YIN Pengfei

2011, 33(3): 73-74.

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The rocking problem of whole limestone slurry agitator of the unit No.3 and No.4 desulfurization system in Guangdong Zhuhai Jinwan Power Generation Corporation Limited was analyzed, and the cause of rocking was found out, after implementing the pertinence measures, the rocking problem of the whole agitator was solved radically, hoping this experience can be a reference to solve the same problems.

Design of electric monitoring system for photovoltaic power station based on PS6000+

ZHANG Qi

2011, 33(3): 75-78.

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Taking the Qinghai Xitieshan 10MW photovoltaic power station connected into power grid as example, the design idea, the hierarchical structure and the networking configuration scheme of the electric monitoring system for photovoltaic power station were expounded. The features and existing problems of the system were described. 

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