Abstracts

Abstracts

Abstracts

Abstracts

廣 告 索 引

s

2017-07-01 Statically indeterminate structure support stress calculation

SU Ruijie, SHAN Xiuyang, LI Xin(Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450046, China)

Abstract:Take statically indeterminate structure support as study objective, mechanical model was designed. Based on static equilibrium equation, the stress and deformation of on the analysis of the support under the premise of using force and displacement condition of deformation coordination and supplement the physical relationship between deformation equation, the force situation of solving differential equations and obtain support. The calculation method is consistent with the result of simulation analysis, and the deviation is within the allowable range. The calculation method is compared with the traditional estimation method, which is more widely used and more accurate.

statically indeterminate structure；support；stress analysis；calculation

2017-07-04 Steel rope stress and structural stability calculation while steel trestle integral lifting

HUANG Peibing, CHEN Yaxiu, WAN Yueying(Jiangxi Hydropower Engineering Bureau, Nanchang 330096, China)

Abstract:In large scale steel structure lifting, steel rope stress and structural stability calculation was usually ignored by engineers. Which significantly increased the safety risk. This paper took steel trestle integral lifting as example, detailed introduced the procedure of steel rope stress and structural stability calculation.

Keywords:steel structure; lifting status; steel rope stress; structural stability calculation

2017-07-07 Boiler heat surface small diameter pipe ultrasonic phased array inspection technology study

WANG Dong, WANG Ye, LIU Wensheng, JIA Shaowei, WANG Jingwei, ZHU Guobin(China Datang Corporation Science and Technology Research Institute Central China Branch Company, Zhengzhou 450000, China)

Abstract:Based on the principle of ultrasonic phased array inspection technology, combined with the character of heat surface small diameter pipe butt weld, the specific ultrasonic phased array inspection transducer and wedge was developed. Two dimensions image inspection for small diameter pipe was realized based on PHASCAN portable ultrasonic phased array device. Artificial defects of ?51mm×4mmsmalldiameterpipewaschosenforverification.Thistechnologyisrapid,intuitional,andeffective.Thiswillensurethesafetyofboileroperationandpreventpipebooster.

Keywords:boiler；heat surface small diameter pipe；butt weld；ultrasonic phased array inspection；transducer；wedge

2017-07-11 Cabinet shock resistant performance study based on response spectrum method

DAI Tingzhen, GU Jinshu, GAO Xuebin(Nanjing Guodian Nanzi Power Grid Automation Company Limited, Nanjing 211153, China)

Abstract:This paper introduced the process of an intelligent power grid secondary cabinet modal analysis by ANSYS Workbench to study its dynamic characteristic, and then carry out the shock resistant study by response spectrum method. The weak points of cabinet were indicated by simulation. After improvement, deformation and stress,and eventually shock resistant performance was improved. This paper provided an effective and convenient shock resistant design method, and provided data for electrical equipment earthquake test.

Keywords:cabinet; shock resistant; ANSYS Workbench; response spectrum method; model analysis；imitation research

2017-07-15 Comparison of different operating methods of centralized heat supply pipeline

LUAN Tianhua(China Huadian Engineering Company Limited, Beijing 100160, China)

Abstract:Based on the centralized heat supply system of a certain area, the hydraulic calculation method for dendritic and ring pipeline was introduced. Circulating resistance of dendritic and ring pipeline was calculated and compared based on different work condition. It was indicated that ring pipeline take advantages than dendritic pipeline on operation energy consumption and reliability in certain work condition. Which has certain value for promotion and implementation.

Keywords:centralized heat supply; dendritic pipeline; ring pipeline; hydraulic calculation; circulating resistance

2017-07-20 EMTP-based interconnection cable lightning overvoltage affecting factors analysis

WANG Xuxu1，ZHENG Xianlong2，GUO Jing3(1.State Grid Corporation of China Direct Current Construction Company，Beijing 100032，China；2.State Grid Electric Power Research Institute Wuhan NARI Company Limited，Wuhan 430074，China；3.Ningxia Power Transmission and Distribution Construction Company，Yinchuan 750000，China)

Abstract:Based on electro-magnetic transient program(EMTP) simulation model， lightning current waveform，cable alignment，cable length，impulse grounding resistance，and the relationship of cable end load and cable lightning overvoltage was studied. The result indicated that steeper the wave front is，greater the overvoltage is. The lightning overvoltage is relatively small if cable is horizontally aligned. Lightning overvoltage is maximum if the cable length is 3 000 m. Cable aligned in same length will reduce lightning overvoltage. Impulse grounding resistant and soil resistant can barely affect the lightning overvoltage. Bigger the load is，greater the cable lightning overvoltage is. The cable lightning overvoltage is greater if load is capacitive or inductive.

Abstracts

Keywords:interconnection cable；lightning overvoltage；EMTP；affecting factors； simulating model

2017-07-24 Regional power grid degree of balance evaluation model and method

WEN Xiaoqiang(Qinhuangdao Power Supply Company, Qinhuangdao 066000, China)

Abstract:The concept of reginal degree of balance was introduced.The model for balance degree evaluation was build based on grey association analysis method. Combination weighting approach of subjective and objective was carried out. The resource improvement friendship degree of five provincial power grid was evaluated. A model was built to testify the correctness of balance degree model. The result indicated that it could indicated the reginal balance degreed under different operation condition. And it featured with commonality and operability.

Keywords:regional power grid; degree of balance; resource optimization; combination weighting; grey correlation analysis

2017-07-28 A power plant’s 350 MW boiler combustion test adjustment and anti-coking test study

BAI Hongsen, GUO Jincheng, HU Zhen(Huazhong University of Science and Technology School of Energy and Power Engineering, Wuhan 430070, China)

Abstract:To solve the problem of boiler coking and NOxover-emission, a series of tests was carried out. The boiler operation status and cause of serious coking was accurately indicated. By improvement adjustment, boiler opertaion and NOxemission was optimized. Constant coking was solved. Boiler combustion adjustment and anti-coking test achieved expectation.

Keywords:combustion test; coal blending; coking; efficiency

2017-07-32 The design and implementation of differential protection based on current differential harmonic content

KANG Feng，WANG Runyi，ZHANG Wei，LIU Qinghai，YANG Qingsong(Nanjing Guodian Nanzi Power Grid Automation Company Limited，Nanjing 211100， China)

Abstract:Accurately determine current transformer (CT) saturation caused by internal or external fault will increase the reliability of differential protection. After analyzing cause of CT saturation and current differential waveform，a differential protection plan was indicated based on current differential harmonic content. CT is able to accurately transmit secondary current at zero passage. By analyzing the current differential harmonic content，the fault is in or out of the protection range will be determined. The simulation proved that，after applying this protection plan， external fault CT saturation will interlock differential protection effectively. Internal fault CT saturation will release differential protection rapidly.

Keywords:differential protection；current transformer (CT)；saturation；current differential harmonic content；current differential wave；simulation study

2017-07-36 Cause analysis of low temperature of reheated steam at low load of boiler and reconstruction of combustor

WANG Lipeng, WANG Lei, QIN Qi, LAN Xiaocun, JI Ya(China Datang Corporation Science and Technology Research Institute Central China Branch Company，Zhengzhou 450000, China)

Abstract:Based on a domestic 350 MW boiler low reheat steam temperature at low load, by investigating and combustion adjusting tests, it was determined that operation adjustment would not solve this problem, and combustor improvement reconstruction is necessary. The plan that to reduce furnace heat absorption and upper flue gas swirling was indicated. After improvement, reheat steam temperature was significantly raised at low load. Situation of combustion and slugging was improved. Unit NOxemission mass concentration was reduced. The combustion adjusting tests after improvement provided instruction cards for operation crew. Unit economy and safety was enhanced.

Keywords:boiler; low load; reheat steam temperature; combustor; reconstruction

2017-07-39 Main transformer non-electric quantity protection action-by-mistake causes analysis and prevention measurements

BAI Guogang(Huadian Energy Company Limited Mudanjiang No.2 Power Plant, Mudanjiang 157015, China)

Abstract:Based on the accident of a power plant unit No.9 non-planed outage, by test analysis and inspection, the integrated converter in winding temperature controller was found burn, and caused winding temperature raising and non-electric protection action. After main transformer outlet tripped, unit stopped. Based on relative standards, the prevention and treatment measurements were indicated after non-electric protection trip switch was out-of-service, to prevent non-planed outage.

Keywords:main transformer; non-electric protection; winding temperature; integrated converter; non-planed outage

2017-07-42 Distribution automation system intelligent device communicating function rapid construction

ZHANG Hang, KANG Zhenquan, WANG Zhenyue(Xuji Group Corporation, Xuchang 461000, China)

Abstract:Based on the problem that distribution automation system intelligent devices have to be reprogrammed for different embedded software of hardware environment, or different application, a rapid communicating function developing method for embedded device was introduced. Plug-in type communicating serv-

Abstracts

ice frame,communicating process plug-in,communicating media plug-in and communicating protocol plug-in were designed. The modelling process of configuration tool was described. Rapid communicating construction and on-line update was realized.

Keywords:distribution automation system；intelligent device；embedded；communicating； rapid construction；on-line updating

2017-07-44 Bali Power Plant dual internal water-cooled generator rotor splash water analysis and treatment

LI Yanfeng(China Huadian Engineering Company Limited, Beijing 100160, China)

Abstract:Based on the treatment of Bali Power Plant generator No.2 rotor discharging support water splash, the cause of water splash was analyzed. Improvement was carried out. Experience was summarized, which could be referred by similar projects.

Keywords:Bali; dual internal water-cooled; generator rotor; splash water

2017-07-46 Puding Power Generation Company 10 kV distribution transformer reconstruction

WANG Wen(Guizhou Qianyuan Power Corporation Limited Puding Power Generation Company, Anshun 562100, China)

Abstract:The development process and production status of amorphous alloy transformer was introduced. The feature of Yyn0 wiring and Dyn11 wiring, and the advantage of amorphous alloy transformer were analyzed. The reconstruction was summarized. The future of amorphous alloy transformer research, produce and application was discussed.

Keywords:amorphous alloy transformer; Yyn0 wiring; Dyn11 wiring

2017-07-48 Super (ultra) critical unit low load MFT cause analysis and improvement strategy

YUAN Shitong(Datang Central China Electric Power Test Research Institute, Zhengzhou 450000, China)

Abstract:The incident that main fuel trip (MFT) of two units of super-critical units, which was caused by feed pump recirculating valve opened while varying condition operating, was analyzed. A proportional-integral-derivative (PID) control strategy was designed. If feed pump inlet flow rate is higher than protection value, recirculating valve is automatically controlled by PID. If feed pump inlet flow rate is low to protection value, recirculating valve is controlled by valve position function. This significantly reduced the effect of recirculating valve on feed water flow rate, and enhanced the safety of units operating in low load.

Keywords:super(ultra)critical；low load；main fuel trip；feed pump recirculating valve； proportional-integral-derivative control

2017-07-52 The incident of 220 kV circuit lightning conductor heat cause analysis and treatment

XIAO Mingwei(Huadian Zibo Power and Heat Company Limited, Zibo 255054, China)

Abstract:Base on the overheat of connection point of high voltage transmission line lightning conductor incomer and transformer gate-type frame, far infrared technology was adopted and diagnosed a heating defect of connection metal fitting. The causation and creation condition of heating was analyzed. The on-site treatment and result of heat defect was introduced. Advices for transmission line lightning conductor insulation joint design was introduced. Which could be referred by similar situation.

Keywords:lightning conductor; heat; induced electromotive force; gate-type frame; insulation joint

2017-07-54 Vertical condensate pump motor over-vibration cause analysis and treatment

CAO Jingfang, WU Changhao, LI Menglin(Huadian Power International Corporation Limited Zouxian Power Plant, Zoucheng 273522, China)

Abstract:A power plant’s unit No.5 condensate pump motor B is over-vibrating while switch operation. By vibration analysis, over-vibration is caused by heavy wear of rubber bearing and shaft sleeve. Treatment measurements were carried out accordingly. Motor over-vibration was eliminated.

Keywords:condensate pump; vertical type; motor; rubber bearing; over-vibration; vibration diagnostic

2017-07-57 S109FA unit main steam pressure abnormal raising cause analysis and treatment

YANG Xutao(Jiangsu Huadian Qishuyan Generation Company Limited，Changzhou 213011， China)

Abstract:Based on an incident of S109FA unit main steam pressure abnormal raising， the flow passage damage situation by foreign matter was introduced. The main cause of combined cycle units steam turbine flow passage failure was identified. Specific inspection measures was introduced.

Keywords:S109FA unit；combined cycle units；high pressure main steam；high pressure cylinder；flow passage；steam turbine；foreign matter

2017-07-59 The optimization and transformation for control circuit of air preheater

SUN Yan,ZHAO Xiaohui(Huadian Laizhou Power Generation Company Limited,Laizhou 261400,China)

Abstract:This paper introduces the principle of Huadian Laizhou Power Generation Company Limited air preheater control circuit, air preheater accident analysis and the problems existing

Abstracts

in the control loop.At the same time,puts forward the solution of pneumatic motor circuit, DC power supply circuit and PLC control circuit,which can optimize these circuit.It can be improving the reliability and safety of the air preheater by transformating control circuit of air preheater.

Keywords:air preheater; control circuit; accident analysis;transformation; reliability

2017-07-62 Gas-steam combined cycle unit bypass system logic improvement

WAN Zhiyong(Jiangsu Huadian Qishuyan Generation Company Limited, Changzhou 213011, China)

Abstract:9FA class gas-steam combined cycle unit has problems of start-up slow and poor economy. After analyzing unit bypass system logic, the economy was enhanced by improving bypass system operation logic.

Keywords:bypass system; cold start; hot start; economy; logic improvement

2017-07-64 Flue gas wet type desulfurization gypsum dewater system improvement and implementation

LIU Kaihui, LIU Liwei, NIE Haitao(Datang Environmental Industry Corporation Sanmenxia Project Department, Sanmenxia 472000, China)

Abstract:Gypsum dewater system is critical for the stability of wet type desulfurization system, especially on ensuring absorber slurry quality, material balancing and byproduct comprehensively utilization.This paper introduced the process and common fault of gypsum dewater system. Based on the reconstruction of Sanmenxia Huayang Power Plant 1 000 MW unit wet type desulfurization gypsum dewater system, the alignment improvement was introduced. Which could be referred by similar upgrading reconstruction.

Keywords:wet type desulfurization; gypsum dewater system; material balance; alignment improvement

2017-07-67 Air-cooled unit auxiliaries circulating water cooling method selection analysis

WANG Lei, HE Ruixue(Shandong Electric Power Engineering Consulting Institute Company Limited, Jinan 250013, China)

Abstract: Base on a power plant 2×300 MW direct air cooling unit in Shanxi Province, the selection and comparison of mechanical air wet type cooling tower, air cooler and evaporative condenser was carried out. One reliable and economic plan was indicated. Which could be referred by similar auxiliary circulating water system.

Keywords:air cooling unit; auxiliaries cooling; mechanical air wet type cooling tower; cooler; evaporative condenser

2017-07-71 350 MW unit electric-bag precipitator trip cause analysis and treatment

FU Sicong(China Datang Corporation Science and Technology Research Institute Central China Branch Company, Zhengzhou 450000, China)

Abstract:Stable operating dust removal and ash conveying system is precondition of ultralow emission. The incident of a power plant’s 350 WM unit electric-bag precipitator trip was introduced and analyzed. The main cause was determined as ash hopper deposition. Treatments were indicated from mechanical, electrical and control aspects. The stability of precipitator and dust removal system was ensured.

Keywords:electric-bag precipitator；trip；pneumatic ash conveying system；ash hopper； deposition

2017-07-73 600 MW coal-fired unit SCR ammonia spraying improving adjustment test studyHAO Gongtao, LIAN Ke, JIANG Jiaxu, ZHU Yue(Huadian Electric Power Research Institute, Hangzhou 310030, China)

Abstract:Based on a power plant 600 MW coal-fired unit denitration project, the harm of ammonia escape, criterion of selective catalytic reduction (SCR) system ammonia spraying improving test and procedure and method of ammonia spraying improving adjustment was introduced. By ammonia spraying improving adjustment test, the NOxmass density of side A and side B outlet was reduced from 60.8% and 28.9% to 13.5% and 8.8%. Ammonia escape mass density reduced by 63.4% and 53.8%. Reactor outlet NOxmass density distribution was improved. Ammonia escape mass density was controlled. The safety and economy of unit operation was enhanced.

Keywords:flue gas denitration; SCR; ammonia escape; ammonia spraying improving adjustment

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優(yōu)勝光分儀器南京有限公司

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