Integrated Intelligent Energy

Analysis and correction of defects in heating surfaces of domestic 1 000 MW ultrasupercritical boiler during construction period

DONG Kun;WANG Huanli;XU Aijun

2010, 32(11): 1-4.

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The development trend of the domestic thermal power industry is to construct the ultrasupercritical units with large capacity. Along with the increasing of the steam pressure and the steam temperature of the unit, the steel grade selected for the boiler heating surface is increased continuously. In the construction period, the top priority is to control the welding process and the welding quality of boiler heating surface. In the construction period of the first 1 000 MW ultrasupercritical boiler in Shenhua Guohua Xuzhou Power Generation Corporation Limited, the supervision of metal quality was enhanced. By inspecting, the defects and the potential hazards of the heating surface tubes were found, and some effective measures were adopted, so the safe, stable and longperiod operation of the unit was ensured.

Control and operation adjustment method for combustible matters in fly ash of 670 MW boiler

WANG Bin;;LI Dewen;ZHAO Yusheng

2010, 32(11): 5-6.

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After the boiler No.3 of Huadian Weifang Power Generation Corporation Limited project phase II was put into operation, its index of combustible matters in fly ash are always higher. In order to effectively reduce the combustible matter in fly ash and raise unit economical efficiency, some measures, such as to improve the air distribution mode, to ensure the appropriate oxygen content and advisable fineness of pulverized coal, were adopted, and the index of combustible matter in fly ash of unit No.3 was improved obviously.

Analysis on reasons of ‘fourtubes’ crack and leakage of 420 t/h boiler and preventive management

WANG Lukui

2010, 32(11): 7-9.

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Taking the crack and leakage accident of a 425 t/h boiler in Henan Zhoukou Longda Power Generation Company Limited as an example, the reasons of crack and leakage were analyzed. From the view of management, some pertinent preventive measures were put forward. It was pointed out that the prevention of crack and leakage of the ‘fourtubes’ must be started from fountainhead, by supervision and management of the whole process, which includes design, manufacture, installation, operation and overhaul, to reduce the probability of the ‘fourtubes’ crack and leakage, lessen the unplanned outage and the economical losses, and ensure the unit safe and economical operation.

Analysis and design of the stiffened cylindrical shell for largescale ACC exhaust ducts

DU Qinghai;SHU Lei;WAN Zhengquan;REN Chibing

2010, 32(11): 10-14.

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Using the application experiences of direct air cooling project of domestic large thermal power project and domestication technical research results for reference, combining with the characteristics of stiffened cylindrical shell structure, a design method of material and geometric nonlinear finite element numerical assist computation was put forward, and the design method was compared and analyzed in depth. The method was adopted in the exhaust duck design of a large ACC project, the structure characteristics in whole combined operation conditions were analyzed, and the structure design optimization of the ACC duck system of large thermal power project was realized.

Computation model of hot point temperature indirect measurement method for transformer winding

LIU Jia;YANG Ping

2010, 32(11): 15-17.

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The progress of the research on hot point temperature indirect measurement method for transformer winding in operation was introduced. According to the establishing features, the computation models of hot point temperature indirect measurement method were reduced to several categories, which are based on the technical standard, the heat resistance or the heat circuit respectively. The theory and the characteristics of these categories of computation models were analyzed in brief. The development direction of the research on the hot point temperature indirect measurement method of the transformer winding was prospected.

Comparative study on valve standards for nuclear power plant and ordinary power plant

ZHOU Tao;RAN Ke;LIU Mengying;FU Tao

2010, 32(11): 18-23.

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Based on the analysis of the valve standards for nuclear power plant and ordinary power plant at home and abroad, these two kinds of valve standards were compared in the respects of the classification, application, main technical conditions and the concrete valve standard etc. By referring to existing valve standard for ordinary power plant, the valve standard for nuclear power plant was blended in the valve standard for ordinary power plant. But in many respects, the valve standard for nuclear power plant has higher technical requirements. The operation approach, which the valve standard for nuclear power plant is combined with the existing relevant standards of electric power industry, was pointed out. This paper proposes to establish unified coordinative power plant valve standard to promote the development of the general electric power industry (the nuclear power generation is included). 

Improving design of dual-ring coal feeder

HAN Jianbin;HU Jian;CHENG Wenguang

2010, 32(11): 24-25.

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Because of the irrational design of the dualring coal feeder, some problems would occur in its operation, such as the unstable operation, the horizontal pulsation, the vertical fluctuation, the coal scattered from the car and so on. These problems leaded that the equipment can not operation normally, increased the work load of the operators and the maintainers and brought serious environmental pollution. Aiming at the problems mentioned above, some parts of the equipment were improved, and favorable effects were obtained.

Application of ANSYS software for radial gate design in hydropower station

YAN Yunjing;ZHANG Ruijie

2010, 32(11): 26-27.

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Aiming at the features of the radial gate in SouthtoNorth Water Diversion Project, the calculation condition and the calculation load were analyzed. By using the ANSYS software, the SHELL63 elastic shell element model was established; the connection, the constraint and the load of metal structures were processed effectively. The stress and the deformation in different conditions were calculated by using the finite element method.

Evaluation method of application effects of steam sealing with different structure in steam turbine

ZHAO Yuzhu;CHANG Hao

2010, 32(11): 28-29.

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According to the type and the structure of the steam turbine, the evaluation method to determine if the steam sealing has achieved the desired effects was given by analysing the test results of several kinds of steam sealings application in steam turbine.

Analysis on reasons of larger deviation between the results of two centring methods for paired wheels

WANG Hui;LIU Ningyi

2010, 32(11): 30-31.

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In centring for lowpressure cylindergenerator paired wheels of a power plant, the problems existed in two centring methods used by two companies were compared and analyzed. The matters needing attention in centring were pointed out, which can be used as reference for other electric power construction enterprises or overhaul service enterprises in centring.

Analysis on abnormal tripping accident of full capacity boiler feed water pump turbine

AN Xin;LI Jijun;ZHANG Yafu;LIU Guobi

2010, 32(11): 32-33.

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The practical significance of the reliability of boiler feed water pump turbine to the unit was expounded. The configuration scheme of the feed pump of domestic 350 MW supercritical unit was introduced. The reasons of abnormal tripping accident were analyzed; and resolving scheme was put forward, which can be used as reference for the same units in commission and operation. 

Unloading process of KM80B bottom unloading dumper

YANG Yafeng;CHENG Li

2010, 32(11): 34-35.

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In order to further raise the transport capacity of road and port, the unloading process of the Ctype rotor double dumper was improved to adapt to KM80B bottom unloading dumper . After the improvement, the Ctype rotor double dumper not only can satisfy the requirements of the unloading operation for the decoupling dumper C61, C62 and C64 and the nondecoupling dumper C63, C76 and C80, but also can satisfy the operation requirement of the KM80B bottom unloading dumper. In addition, the improved unloading process can raise the unloading operation efficiency of the equipments. 

Analysis on reverse charging in secondary equipment circuit of potential transformer

LU Yuhong

2010, 32(11): 36-38.

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Some trouble frequently occurred in 220 kV system AC voltage circuit of substation, which may impact on the safe operation of the secondary devices, even can cause the protection malfunction. Especially, the reverse charging in secondary circuit of the potential transformer may lead serious accident. Through the practical example analysis of a reverse charging of potential transformer, the consciousness on the serious accident caused by fault in AC voltage circuit was raised. The measures to avoid the reverse charging accident were proposed. 

Analysis on an abnormal switchedover accident of waterring vacuum pump

GAO Linfeng

2010, 32(11): 39-40.

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The characteristics of the waterring vacuum pump and its typical system composition were introduced. The process of an abnormal accident occurred during switchingover operation was analyzed. The preventive measures were put forward to ensure the safe and economical operation of the unit. 

Analysis and treatment on transformer faults of electrostatic shielding and oil sulfur corrosion

LA Yuan;CHEN Jiehua;CHEN Zhongdong

2010, 32(11): 41-46.

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Based on an example of case, which is a transformer fault of electrostatic shielding and oil sulfur corrosion, the reasons of the fault were analyzed. The influence of the oil sulfur corrosion on the insulation strength of the transformer was discussed, and relevant preventive measures were proposed.

Treatment of asynchronous motor vibration fault caused by temperature rise

HUANG Jian

2010, 32(11): 44-46.

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The process of an asynchronous motor vibration fault caused by temperature rise in a bump station and its treatment were expounded. A conclusion was obtained that the allowable temperature and the temperature rise of the motor stator/rotator are not only associated with the insulation class, but also restricted by the thermal expansion of the stator/rotator or the air gap. 

Water level measurement and control strategy of condenser hot well

YANG Jinfeng;HU Shanyun;XIAO Changge

2010, 32(11): 47-49.

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The influence of water level control of condenser hot well on the unit operation was expounded. The harms of the too higher or too lower water level of the condenser was analyzed. According to the comparison of the condenser water level measurement schemes, combining with practical field situation of Huaneng Weihai Power Plant project phase III, the water level measurement scheme of condenser hot well was reformulated, and the control strategy of condenser water level automatic adjustment system was put forward. The improved measurement scheme and control strategy can control the water level of condenser hot well stably, shorten the oscillation period of the regulating loop; and ensure the safe and stable operation of the unit.

Problems existing in primary overspeed protection and its technical reformation scheme

YANG Shiyong

2010, 32(11): 50-51.

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The configuration and the action process of the primary protection of the water turbinegenerator set were introduced. The problems existed in primary overspeed protection were analyzed. The technical reformation scheme of the primary overspeed protection was put forward. After the reformation scheme was implemented, the faulty action of the primary overspeed protection no longer occurred.

Problems existing in airpreheater of WGZ670/1402 type boiler and reformation measure

WANG Qingdong

2010, 32(11): 52-54.

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In the Shandong Bainian Electric Power Development Corporation Limited, the temperature of the exhaust flue gas was higher, which was caused by the larger air leakage and the lower heat exchange efficiency of the airpreheater. In order to raise the heat efficiency of the boiler, the problems existed in airpreheater were analyzed, and the rectification measures were formulated. Based on investigation and argumentation, the airpreheater was replaced by the rotary airpreheater. After the reformation, the heat efficiency of the boiler increased by 3%, and the economic benefit was remarkable.

Experimental analysis on Dayugou coalblended burning in 1025 t/h boiler

LIU Zhijie;XU Juntao

2010, 32(11): 55-56.

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In order to reduce the generating cost effectively and ensure the unit safe and stable operating, based on the analysis of the combustion characteristics of the Dengfeng coal blended with Dayugou coal, the blending scheme was formulated. It was demonstrated by the blended combustion experiment in boilers No.4 and No.5 of the Second Electric Power Branch of Henan Zhongfu Industry Corporation Limited that the Dayugou coal can be blended in ratio of 20%; the combustion will be safe, and the generating cost will reduce 0.01Yuan/kW·h, while the changes of the system and equipment structure are not needed. 

Reason analysis and treatment of exciter bearing vibration of 50 MW unit in a thermal power plant

CHEN Sheng

2010, 32(11): 57-58.

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The larger vibration of the exciter bearing bush of 50 MW unit in a thermal power plant influenced on the unit safe operation. The characteristics and the law of the vibration were researched and analyzed, and the fault reason has been determined that the connecting force between the rotating rectifier insulating board of exciter and the bolts was not sufficient, which causes the insulating board shifting and the bearing bush vibration increasing. After the bolts had been tightened up, the vibration fault was eliminated.
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Safety monitoring of hoist in active service of hydraulic and hydropower projects

JIANG Ning;LI Wenming

2010, 32(11): 59-60.

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The quality of gate hoist is related with the safe operation for whole hydropower engineering. In our country, quite a number of hoists in active service are aged at present stage, their performances are seriously deteriorated, and lead to the security and durability are too low. In order to ensure the production safety, give full play to hydropower engineering benefits and avoid major accidents, viewing from safe operation and scientific management, the safety monitoring and evaluation for hoists must be enhanced urgently. In this paper the contents and methods for the safety monitoring were introduced, and some pertinent suggestions were put forward. 

Application of the air water backwashing technology in siphon filter reformation

LI Shengwei

2010, 32(11): 61-64.

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The equipments and the operation principle of the siphon filter in sewage station were introduced. The problems occurred in operation of the siphon filter were analyzed. A reformation method was put forward, in which the air water backwashing technology is adopted to raise the backwashing efficiency of the siphon filter. The method is of important significance for reducing the water consumption in backwashing process, shortening the backwashing time, raising the quality of the output water and lengthening the operation period. 

Variable frequency reformation of condensate pump for 600 MW supercritical steam turbine

MA Shidong

2010, 32(11): 65-67.

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The variable frequency reformation of the condensate pump of 600 MW supercritical unit and its energysaving effect were analyzed. On the basis of warranty for safe operation of the condensate pump，the ‘one drive one’ mode was adopted in the variable reformation of the condensate pump. The operation data after reformation show that the reformation scheme achieves the design requirements, the power consumption of the condensate pump reduced by 36%, and the houseservice consumption rate was reduced by 0.12%, the energysaving effect is remarkable.

Reasons analysis and countermeasures of coal jamming of coal handling system in thermal power plant

ZHAO Yashan

2010, 32(11): 68-71.

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The parts and positions, which the coal jamming faults are frequently occurred in thermal power plant coal handling system, were introduced. The reasons of coal jamming in coal handling system were analyzed. Combining with the actual situation of the engineering design, the effective measures for eliminating coal jamming were put forward, and favorable results were obtained. 

Design and type selection of bag filter for garbage incinerator

DENG Huipeng

2010, 32(11): 72-75.

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The influences of the fly ash particle size and the concentration of dry/semidry desulphurized dust on the deashing mode of the bag filter for garbage incinerator were introduced, and the design details of the nozzle and the tubesheet were described. The method for selecting the filter materials in accordance with the flue gas characteristics of the garbage incinerator was expounded. By taking an engineering project as an example, the importance of design and type selection of bag filter for garbage incinerator on the basis of the flue gas characteristics were illustrated.

Typical design of ammonia station for SCR flue gas denitration equipment

CHEN Peng;HU Yongfeng;ZHU Liansen

2010, 32(11): 76-78.

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The characteristics of three reductants, which are normally used in SCR flue gas denitration technology, are compared . Taking the 660 MW ultrasupercritical unit of a coalfired power plant as an example, the typical design of the ammonia station for large coalfired unit flue gas denitration equipment of which the liquid ammonia is used as reductant, was introduced, and the matters needing attentions in the ammonia station design were pointed out.

Application of honeycombed catalyst in flue gas denitration using selected catalytic reduction method

HUANG Rui;XI Wenchang;CHEN Fuguo

2010, 32(11): 79-81.

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The domestic main energy source is coal; this situation would not change in the short term. Therefore, to reduce the NOx emission in coal fired flue gas is one of main research topics of environment protection technicians. The theory of selected catalytic reduction denitration was introduced. The characteristics of three kinds of catalyst were compared. The main factors influencing on the activity of the honeycombed catalyst (such as the reaction temperature, the ratio of ammonia and nitrogen, the velocity in empty tower, the high contents of calcium and sulfur) were analyzed. The application prospect of the honeycombed catalyst in coalfired power plant was expounded. 

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