Integrated Intelligent Energy

The anti interference design of analog integrator for electronic current transformer

XU Liqing, SHI Zhiwei, YU Huawu, DONG Jincai

2016, 38(5): 1-3.

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Abstract:In the electromagnetic compatibility test, the analog integrator of electronic current transformer is liable to be disturbed.According to the characteristics of surge and common mode interference of electrical fast transient, this paper proposed the antielectromagnetic interference measures for the analog integrator of electronic current transformer. It optimized the voltage suppression circuit using safety capacitors, piezoresistors and transient suppression diodes, improved the filtering circuit using metal film resistors, high frequency capacitors and differential amplifier with high common mode rejection rate. Meanwhile, the surge suppressing, voltage clamping and high frequency filtering of interference signal were conducted by adopting some measures, such as optimizing the circuit board layout and strengthening the grounding, etc. The experimental results proved that this analog integrator has strong antiinterference capacity.

Research of coal inventory based on six axis aircraft

XING Yafei

2016, 38(5): 4-7.

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Abstract:Six axis aircraft is a new type of coal inventory system. This paper introduced the principle,compose and feature of this system.The comparison of testing data and data from bucket wheel proved that the application of this system could significant save time and cost,reduce labor intensity,and realize automation and informatization of coal inventory.

Application of fieldbus foundation on thermal power plants

CUI Chaochao1,ZHANG Ying2,SHEN Dongsheng2,CUI Yiqun1

2016, 38(5): 8-10.

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Abstract:Base on the practice of Huaneng Xinjiang Luntai Power Plant 2×350MW ultra-critical coal fired unit, the design, construction principle and debugging of fieldbus foundation for thermal power plant was introduced. The application, construction & commissioning of fieldbus foundation for thermal power plant was discussed for reference. 

Ring grid distributed type arc protection system for intelligent substation

ZHANG Wei,LI Yuping,KANG Feng,CHEN Qingxu,YE Pinyong

2016, 38(5): 11-14.

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Abstract:In the new generation intelligent substations, to protection the LV busbar, shared information provided by advanced internet communication technology was fully applied, incorporate with merging unit and intelligent unit, ring grid distributed arc protection for intelligent substation were indicated. Slaves interconnected by dual redundant ring grid and share data with each other. Based on highly reliable communication, logical judgement will not be done by salves. Pointband universal type sensor and its selfinspection technology will benefit the system extension and maintenance. High speed tripping technology will increase the overall performance of intelligent substation.

Algorithmic research on the peak regulating range of cogeneration unit and its application

LU Jun1,NAN Hao2,LI Wei1,QIAN Huadong2, LU Peng1, LIU Na2, GAO Ning1

2016, 38(5): 15-17.

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Abstract:As the peak valley difference of grid load and the capacity of heating unit increase, the stability and dispatching of power grid are faced with great difficulties. In order to ease this situation, most of the heating units need participate in the peak load regulation while ensuring the heat supply. In this paper, a linear fitting of turbine working condition diagram was conducted and its fitting function was obtained, which could figure out the peak regulating range of cogeneration unit according to the information of current heating extraction flow, maximum main steam flow and minimum power, etc. This calculation method is convenient and rapid for engineering use because that the local thermal test is not required, and it was verified that the calculated peak regulating range is basically close to the actual range by living example.

Study and application of boiler water wall anti corrosion technology

ZHANG Lei

2016, 38(5): 18-21.

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Abstract:After analyzing the cause and affection of large scale power plant coal fired boiler water wall corrosion. Pertinent measurements were studied. Matrix distributed air button type close to wall air system anti corrosion technology was claimed. This technology was applied on a 660MW supercritical unit wall type boiler, and proved effective.

Establishment and analysis of load pressure model for the thermal power unit

MA Liang

2016, 38(5): 22-26.

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Abstract:The coordinated control system of traditional thermal power plant is difficult to meet the requirements of power grid under new circumstances. In order to make an analysis and optimization of the system,a load pressure mathematical model of unit should be established.Taking the 2×330MW units of the first phase of Huadian Luohe Power Generation Company Limited as examples,this paper established the mathematical model of units on the basis of mechanism analysis, and confirmed the model parameters according to the historical data and the results of dynamic test. In addition,a simplified model was also built for the distributed control systems of objected units.Through comparing the model results with actual operation data of units,it was proved that the model has good accuracy and reproducibility.The establishment of unit model could lay a good foundation for the future application of advanced control algorithm.

Deep sliding parameter shutdown of 660MW ultra supercritical power unit

KONG Fanxu, GUO Yiyong, KUANG Zheng

2016, 38(5): 27-29.

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Abstract:As the capacity and other parameters of ultra supercritical power unit increase,the cooling time after the shutdown of unit is greatly extended, which strongly influences the overhauling of unit and reduces its utilization time. This paper summarized the operation process of deep sliding parameter shutdown of 660MW ultra supercritical power unit and its announcements, minimized the body temperature of boiler and turbine, and effectively shortened the cooling time of unit, which ensured the safety, stability and reliability of the unit during the process of shutdown.

Analysis of QFR480 generator seal oil pressure abnormal fluctuation and solve

YANG Xutao

2016, 38(5): 30-32.

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Abstract:The operational feature of Oriental Mitsubishi QFR480 gas turbine generator oil seal system was introduced. The causes of seal oil pressure fluctuation were analyzed. Troubleshooting plan and procedure were indicated, which is able to increase the reliability of oil seal system oil supply.

The effect of steam distribution on bearing bush metal temperature and solving

REN Liang

2016, 38(5): 33-35.

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Abstract:Based one the incident of a power plant’s unit No.2 bearing bush metal temperature rising, the author tested and analyzed the effect of steam distribution mode on bearing bush metal temperature, and indicated the improvement measurements. The problem was solved.

Radial seal transformation of rotary air preheater and its economical analysis

LIU Hong

2016, 38(5): 36-37.

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Abstract:This paper analysis the reason of high air leakage rate of No.5 and No.6 rotary air preheater. Based on malpractice of apex seal of rotary air preheater and the characteristic of heat transfer elements, this paper brings up a radial seal transformation plan. After this transformation, the air leakage rate declined obviously.

Reconstruction design of safety monitoring and management system for gantry crane

JIANG Jun1,GUO Yalan2

2016, 38(5): 38-40.

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Abstract:In order to implement the national standard of crane safety monitoring and management system corresponding national policies, a method of how to reform the finished gantry crane to meet the requirements of the national standard has been studied. It is based on the original PLC control system framework, and does not affect the normal operation of the original system. It makes the monitoring parameters of the whole equipment more perfect. The implementation of the actual reconstruction project verify that the performance of the design is stable, and it is easy to achieve and meet the requirements of the national standard.

Discuss of ultracritical secondary reheat megawatts unit high pressure heater Layout

YAN Zhe, ZHANG Shiming, GU Yong

2016, 38(5): 41-42.

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Abstract:By introducing the structure and performance feature of coiler, to apply coiler high pressure heater to instead Utube high pressure heater was proposed. By analyzing the second phase of Huadian Jiangsu Power Plant Company Jurong Power Plant’s double reheat of high pressure heater, the reliability and feasibility of coiler high pressure heater was introduced.

Study of HR3C steel under high temperature after lonetime running

LI Yanjun，NIU Baoxian

2016, 38(5): 43-45.

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Abstract:It has been proved that HR3C steel has good high temperature performance, corrosion resistance and welding performance, and it can be used for ultrasupercritical power plant boiler superheater and reheater tubes. It was found that there is no more difference between run pipe intensity and spare pipe intensity of HR3C, but the brittleness increases obviously，the break elongation and impact toughness significantly reduced of run pipe. A large number of grain boundary carbides in flaky distribution, which reducing the grain boundary strength and making the material easy to brittle fracture along grain boundaries.

Optimized transformation of technical water supply system of the Xiaolangdi Project

YU Yue, JIAO Yufeng, WAN Yongfa, WANG Hongfei, ZANG Weijie

2016, 38(5): 46-48.

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Abstract:In order to improve the safety and reliability of technical water supply system of the Xiaolangdi Project, technical water supply system transformations to two units that combining the unit Alevel maintenance were conducted. This paper introduced five optimized transformations of water supply pipes, valves, pressure reducing valves, water filters and pipeline anticondensation, and proposed corresponding countermeasures to the construction difficulties, which provided a reference for the optimized transformations of other largescale hydraulic projects.

Inspiration of Murphy’s Law on the safety production management of electric power

ZHANG Xuehai, WANG Wenwei, MENG Gang

2016, 38(5): 49-51.

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Abstract:This paper introduced the main content of Murphy’s Law, analyzed the causes of production accident through studying on several typical production accidents of a certain power plant, and expounded the inspiration of Murphy’s Law on the safety production management of electric power. It pointed out that the hidden danger should be eliminated before accident in order to break the curse of Murphy's Law to the safety production management of electric power.

Reason analysis on the abruptly dropping of vacuum degree in the process of vacuum pump switching and its countermeasures

WAN Zhiyong

2016, 38(5): 52-53.

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Abstract:The abruptly dropping phenomenon of vacuum degree often occurs during the vacuum pump switching process of gassteam combined circulating generation unit, which seriously threatens the safety and stable operation of unit. Through analyzing the dangerous points in the vacuum pump switching process, this paper pointed out the reason of abruptly dropping of vacuum degree. After the optimizations of operational logic and operation order, the abruptly dropping phenomenon of vacuum degree was eliminated and the safety of equipment operation was improved.

Ash deposition and air leakage control of circulating fluidized bed boiler tube type air preheater

DU Jiajun

2016, 38(5): 54-56.

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Abstract:Ash deposition and air leakage existed in a power plant’s circulating fluidized bed boiler tube type air preheater. After analyzing the equipment structure, fired coal type and operation condition, poor equipment design and installation, and poor air heater drain control are the main causes. By equipment maintenance, technology improvement and adding adjustable soot blower, the safety, satiability, reliability and cost efficiency were ensured.

Calculation analysis of desiccant and ventilation quantity in direct firing pulverizing system of medium speed coal pulverizer

XU Qi, LI Qiaoqiao, PAN Mengmeng

2016, 38(5): 57-60.

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Abstract:Taking caliper bituminous coal combusted in the forced circulation boiler Model HG-1900/25.4-MPa as an example, the impact analyses of ventilation quantity on coal mill output and life, as well as the desiccant temperature on coal mill output and boiler coal combustion effects are performed. The results show that the appropriate selection of ventilation quantity and the reasonable determination of desiccant temperature and share ensure the coal mill to run at maximum output condition, the power consumption to be reduced effectively, and the service life and economy of coal pulverizing system to be improved. Furthermore, the unit economy, safety and stable operation can be also protected.

The ammonia storage content calculation of horizontal liquid ammonia tank

ZHANG Yaojun, ZHANG Guojun, XUAN Dayu

2016, 38(5): 61-63.

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Abstract:In order to accurately calculate the ammonia storage content of horizontal liquid ammonia tank, this paper analyzed the gasliquid transformation rule of ammonia and the changing rules of gas phase pressure and liquid ammonia density in liquid ammonia tank, and proposed a calculation method of ammonia storage content according to the temperature, pressure and liquid ammonia level in liquid ammonia tank. The field application indicated that this method could accurately calculate the ammonia storage content of liquid ammonia tank, the consumption and unloading capacity of ammonia over a period of time, etc.

Effect of ultralow emission on gas flow continuous detecting system design

SHAO Min

2016, 38(5): 64-67.

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Abstract:Recent years, government’s regulation of power plant pollution emission became more and more strict. Technology applied to achieve ultralow emission will affect the design continuous emission monitoring system (CEMS). The operation principle of CEMS was introduced. Combined with twintower cascade, twintower duocycle and twintower multiple and other ultralow emission technology, the affection of different ultralow emission technologies on the design of CEMS was analyzed.

Exploration of energy saving for thermal power plant environment protection facilities

YANG Qingshan

2016, 38(5): 68-69.

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Abstract:Due the more and more strict emission regulation, the number and performance of power plant environment protecting facilities is increasing. After the improvement construction of ultralow emission, power plants’ environmentalfriendly construction will come to a conclusion. However, those constructions will increase the power consumption. To move a step over the existing accomplishment, this paper indicated an improvement plant to comprehensively utilize environment protecting facilities and saving energy. Applying this plan while low load operation could high efficiently use environment protecting facilities, and significantly reduce plant energy consumption.

Energysaving transformation measures of steam condenser vacuum system

HAN Lina, LI Shaogang, WANG Gang

2016, 38(5): 70-73.

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Abstract:To solve 1000MW ultra critical units water ring vacuum pump’s problem of high electricity consumption, low efficiency, high maintenance cost, the solution of using high efficiency roots vacuum pump to instead was provided. Based on electricity saving and limiting vacuum, two kinds of vacuum pump were compared. After increasing vacuum degree, coal consumption was reduced, unit efficiency was increased. 

Contrastive analysis on electricity generation performance of photovoltaic power station which based on temperature correction

CHEN Jianguo, ZHANG Jinjian,YU Litao

2016, 38(5): 73-76.

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Abstract:System efficiency(PR)index is a frequentlyused evaluation parameter for power station, while calculation of PR of photovoltaic power station at present is calculated as per stipulation of IEC 61724—1998 Guide Rule for Performance Monitoring, Measurement, Data Exchange and Analysis of Photovoltaic System, and influence of temperature of unit battery piece is not considered, therefore difference will be caused between calculation value and actual value in winter and summer. The study added temperature correction factor on basis of traditional PR formula, compared result of different temperature correction method, obtained relatively accurate result of Sunpower temperature correction method, and conducted investigation to calculation method of temperature of different battery pieces.

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