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Table of Content

    25 February 2019, Volume 41 Issue 2
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    Intelligent substation secondary equipment online fault operation and maintenance platform architecture research
    ZHANG Xiaorui，JI Ling， TAN Tingfang， LIU Wenbiao，WANG Dongxia
    2019, 41(2):  1-5. 
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    It puts forward the architect for the intelligent substation secondary equipment,its own online fault operation and maintenance to finish the evolution process from the business demand to the architecture design. Integration modeling technology is adopted to realize the unification of data access.Based on CIM/E file,master and slave station integrated interaction model is built.The global unique coding technology realizes the global identification  of data. Based on Presto big data technology, online operation and maintenance capability of the platform is consolidated. Finally, the typical application scenarios of online fault alarm, event restoration and intelligent maintenance strategy confirm the superiority of the platform.
    Localization of GE 9E gas turbine brushless excitation system
    SHAN Huapeng，GU Jianrong
    2019, 41(2):  6-9. 
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    It introduces the localization of the GE 9E gas turbine generator brushless excitation system. In response to the special operation requirements of the brushless excitation system of the gas turbine, the PSVR100 excitation system adopts a number of advanced technologies to carry out targeted design. “Startup/shutdown with one key”works with the help of turbine island control system (Mark VI) during the startup and shutdown of the gas turbine. PSVR100 generator excitation system has excellent control performance, stable and reliable system operation, which perfectly replaces the imported excitation system in the original GE gas turbine brushless excitation system.Localizing the electric control device of this type is of great significance to the timeliness, economy and reliability of the following maintenance. And the economic benefits are remarkable.
    Discussion on detection capabilities comparison of water analysis laboratories in thermal power plants
    YU Yang，LIU Qinghua，ZHOU Can
    2019, 41(2):  10-13. 
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    In order to find out the irregularities in laboratory tests, improve the detection capability and management level of water analysis laboratory in thermal power plants, event organizer sent water quality blind samples with iron and chlorine to 8 power plants in a certain area.All laboratories were required to complete the test within specified time, and report the process records, test methods, test instruments, test results, etc. to the organizational unit. Staff of the organizer compared and analyzed the results, and then corrected the irregularities.
    Fault prediction system for low voltage power grid based on smart meters
    ZHANG Hang1，2,WANG Zhenyue2，CHEN Xing2
    2019, 41(2):  14-17. 
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    Proposes that smart meter can be used as a feedback of “Last gasp” information, which can be combined with the geographic information system and  identify lowvoltage fault point of distribution network through grid topology analysis technology.The nonmetering function of smart meter can locate lowvoltage fault  of the distribution network, improve the efficiency of lowvoltage power fault treatment, improve operational management efficiency, reduce power grid operating costs,improve power supply reliability and customer satisfaction, which leads to significant economic and social benefits.
    Research on a differential current protection device for Tconnection lines
    ZHANG Yonggang1, 2，WANG Yue3，YAO Liang1, 2，CHEN Qi1, 2
    2019, 41(2):  18-21. 
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    It introduces the main characteristics and application status of Tconnection lines. It also analyzes threeterminal data synchronization method, differential protection criterion, CT saturation discrimination method, logicconverting operation mode which are applied into Tconnection current differential protection device. The dynamical simulation test results show that the performance of fiber differential current protection device for Tconnection lines developed according to the principles above is excellent and reliable, which can completely meet the requirement for wholeline quickaction of Tconnection lines.
    Analysis of variation period and trend of annual runoff series based on Matlab
    XU Jinying1，HU Mingting2
    2019, 41(2):  22-25. 
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    Taking the leading reservoir of a basin as  research object, the annual runoff data from 1952 to 2013 was selected. Based on Matlab calculation,the variation period and trend of the annual runoff series of the leading reservoirs in the basin are analyzed by continuous power spectrum method, Kendall rank correlation test and Spearman rank correlation test. The results indicate that there were no obviously change period but a slightly decreasing trend in the annual runoff series of the leading reservoir.
    Design and implementation of a residual voltage module scheme for electricity distribution terminals
    QIN Kai，GAO Zhiyong
    2019, 41(2):  26-27. 
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    Residual voltage lockup closing logic is introduced into current insitu feeder automation technology, which can quickly isolate faults. A residual voltage module is added to the feeder automation terminal to implement the residual voltage lockup function. Based on electricity distribution terminal products of a company, a residual voltage module scheme which combines software and hardware is completed. Itrealizes the protection logic of voltagecurrenttime feeder automation and meets the technical standards issued by State Grid Company Limited according to tests.
    Cause analysis and countermeasures for tube burst of hightemperature superheater in supercritical boiler
    KE Hao，LI Zhenliang，WANG Xi
    2019, 41(2):  26-27. 
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    The supercritical boiler hightemperature superheater burst tube in T91 steel was tested and analyzed after 12079h operation. Through the macroscopic morphology analysis, chemical composition analysis, microstructure observation and mechanical property test, the early failure reason for super heater burst tube in T91 steel  is considered to be foreign matter clogged in the pipe.Longterm overheating accelerates the aging of pipe. The pipe’s performance degrades, which finally results in pipe burst.The cause of the blockage is analyzed and corresponding countermeasures are proposed.
    Cause analysis of secondary blade cracking at the end of lowpressure rotor in a power plant
    HOU Jiaxu，ZHOU Shukang，LI Yanjun
    2019, 41(2):  28-31. 
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    During a class A overhaul of No.2 unit in a power plant, there are 27cracks fromlow pressure lefthanded fifth grade blade to righthanded fifth grade(that is the last second stage)blade.Through the comprehensive appearance inspection and laboratory test, the reason for the cracks on the low pressure fifth blade of No.2 unit are found.It can provide reference for the analysis and processing of related problems.
    Cracking cause analysis and treatment of cold reheated steam Tpiece of a 450MW gas turbine
    WANG Lin，LIU Jinqiu，XIA Xiaotao
    2019, 41(2):  32-35. 
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    某450MW燃机电厂在机组开机时，发生高温再热蒸汽冷段管道三通焊缝开裂泄漏。分别从焊缝开裂趋势、坡口结构形式及支吊架承载情况进行分析其开裂原因，结果表明管系限位支架承载失效、焊缝坡口形式的不规范，加之机组频繁启停，最终导致该焊缝接头开裂，并对开裂焊缝进行了修复。
    Application analysis on high back pressure heating technology for supercritical intercooling unit
    HOU Xiaoning1，Abu Dhabi Krimu·ABU DHATI2
    2019, 41(2):  36-38. 
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    High back pressure heating is a highefficiency heating method that can recover the cold source loss of steam turbines to the utmost extent. The principle of high back pressure heating is introduced. Taking the high back pressure transformation of 2×350MW supercritical intercooling units in Kashi Thermal Power as an example, the main contents of high back pressure reform on supercritical intercooling units are introduced. At the same time, tests under the main working conditions are carried out. Analyzing the efficiency based on the testing data,it is proved that the high back pressure heating can effectively reduce the coal consumption of the unit, which is of great promotion value.
    Application of film bag grouting technology in leakage treatment of Hydropower Plant
    HU Dechun
    2019, 41(2):  39-42. 
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    The film bag grouting technology injects chemical materials into the film bags by highpressure grouter. As chemical material meets water, it quickly disperses, emulsifies, expands，solidifies and forms a new compound elastomer which makes the film bag expand and completely fill the larger holes or pipes to stop water leakage. Combined with the treatment process of leakage in Xuecheng Hydropower Plant, the application of the filter bag grouting technology is  introduced as a reference for similar cases.
    Analysis and solution for temperature fluctuation of turbine shaft seal steam
    SONG Xin
    2019, 41(2):  46-48. 
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    Stable temperature of shaft seal steam is very important for safe operation of steam turbine. Analyzing the abnormal temperature fluctuation of shaft seal steam in a steam turbine, it is pointed out that the change of steam temperature is due to the change of steam flow which results from the deviation of pressure measurement point. It further causes the movement of uneven steam mixed flow area and affects the measuring accuracy of steam flow temperature.Measures such as adjusting the pressure measuring point of the lowpressure shaft seal steam and reducing the set value of the inlet pressure of the lowpressure shaft seal steam are proposed, which effectively solves the problem of temperature fluctuation of the shaft seal steam.
    Cause analysis and treatment of steam flow excited vibration of steam turbine in Tongchuan Zhaojin Power Plant
    WANG Zhihui,SONG Zhiqiang,WANG Gangfeng,YU Yong
    2019, 41(2):  46-48. 
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    Huaneng Tongchuan Zhaojin Power Plant has been affected by steam flow excited vibration in different degrees after the operation of 2 turbines. The No.1 and No.2 bearings have greater vibration within heavy load. By analyzing the causes of steam flow excitation, after thorough investigation and demonstration, the valve sequence optimization method is finally used to eliminate the steam flow excitation, so as to improve the load capacity of the units and ensure the safety of the units.
    Reasons and regulation measures of low reheat steam temperature under variable load
    CAI Peng，CHEN Kui，L Xia
    2019, 41(2):  52-54. 
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    Reheat steam temperature has great influence on power generation efficiency.Regulation measures of the reheat steam temperature after low NOx combustion modification has been worthy of further study for the electric power workers. In low load conditions, the characteristics of the unit and the control ofreheat steam temperature change significantly with variable load. As the reheat steam temperature under the variable load is generally low after the low NOx combustion modification of the boiler, the cause analysis is carried out, and the countermeasures for the reheat steam temperature regulation are put forward.The adjustment strategy was implemented on the 330MW boiler, which reduced the fluctuation of the reheat steam temperature under variable load, and provided experience for the stability of the reheat steam temperature.
    Study on ammonia escape rate control technology of SCR denitrification system in coalfired power plant
    YOU Songlin1,LUO Honghui1, WANG Zhen1, YAO Yongqi1,LIU Xiuru2,SUN Yiqing2,CHEN Feng2
    2019, 41(2):  55-59. 
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    Based on the reaction principle of SCR denitrification system, causes of ammonia escape and hazards to coalfired power plants are revealed. Factors affecting the ammonia escape rate of the denitrification system include denitrification catalyst performances, flue field uniformity, boiler operation modes, ammonia injection logic system, measurement gauges and methods, etc. According to these influencing factors and units operational status, control strategies for reducing ammonia escape rate are proposed. It provides guidance and reference for ultralow emission modification and performance optimization of SCR denitrification system in domestic coalfired power plants.
    Research on the feasibility of reusing reverse osmosis concentrated water and reclaimed wastewater into circulating water system
    LI Yamin1，GUO Tinghui2
    2019, 41(2):  60-64. 
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    The large amount of reverse osmosis concentrated water and ion exchanger reclaimed wastewater in boiler feed water systems of thermal power plants can not be fully utilized.By analyzing the quality of reverse osmosis concentrated water and reclaimed wastewater, reasonable exploring on the feasibility of reusing it into circulating water system is made.Conclusion is drawn that it is feasible to reuse reverse osmosis concentrated water and reclaimed wastewater into the circulating water system, and the water-saving benefit is obvious.
    Economy calculation and application of lowlow temperature economizer
    ZHANG Fang，XIU Zhengping，FANG Jin
    2019, 41(2):  65-72. 
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    In order to fully exploit the potential of the lowlow temperature economizer on flue gas waste heat recovery to save the energy of steam turbine, equivalent enthalpy drop method is used to calculate the coal saving of dualway water intake and the dualway water return  lowlow temperature economizer under various working condition, based on operating parameters of a unit after transformation. Then the coal saving curve of lowlow temperature economizer of this type under variable working conditions and the most economical return water switching method can be obtained. It can provide debugging and operation reference for units with the same type of lowlow temperature economizer.
    Classification and optimizing retrofit of economizer for 600MW supercritical boilers
    REN Bin
    2019, 41(2):  69-72. 
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    Low inlet flue gas temperature of selective catalytic reduction (SCR) denitrification system under low load condition cannot meet the requirement for the operation of SCR devices. An upanddown classification retrofit for economizer is proposed. The plan can effectively increase the inlet temperature of the SCR denitrification device and meet the requirements of SCR operation without affecting the boiler efficiency and exhaust temperature. The new added primary economizer adopts H finned tube to solve the compact space at SCR exit . After the retrofit, the optimized soot blowing method for boiler can avoid the low flue gas temperature at the SCR exit under the longtime and low load condition, and avoid high flue gas temperature at the SCR exit under rising load condition. Finally, the problems that need to be considered in economizers classifying layout for different types of units are given.
    Determination of desulfurization wastewater amount of coalfired plants under zero liquid emission situations
    JIN Yinjia1,LI Zhuang1,TANG Guorui1,LIN Jingmin2,WANG Qingdong3
    2019, 41(2):  73-75. 
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    Determination of the amount of desulfurization wastewater not only matters the operation of flue gas ultralow emission equipments but also directly affects the investment and running costs of the wastewater treatment. However, many factors could effect the amount of desulfurization wastewater, such as Cl- concentration in the desulfurization slurry, gypsum property control, desulfurization process water quality as well as coal type, flue gas temperature, etc. All these factors were analyzed, and the wastewater reduction ways were also proposed.
    Transformation of pulse valve sequence control system of bag filter based on DCS
    ZHANG Songqi，YANG Yong，XU Tao
    2019, 41(2):  76-77. 
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    Modification of injection sequence of control system is made on bag filter in Guodian Zhumadian Thermal Power Company Limited. A distributed control system(DCS) replaces a pair of original programmble logic controllers (PLC)which are shared by the 2 units.It introduces the process of transformation and implementation of DCS in detail, as well as the positive effects and safety improvements that resulted from the commissioning of the system. This transformation improves the safety, stability and operabilityof the pulse jet control system of bag filters.
    Research on SO3 emission control of 300MW generators by WESP technology
    SHI Xu1,2
    2019, 41(2):  78-80. 
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    The working principle of the wet electrostatic precipitator (WESP) is briefly described. Based on the application of 2×300MW units in Guang’an Power Plant in high sulfur coal area, the influence of the WESP secondary current and secondary voltage on the removal rate of SO3 is analyzed，which provides reference for the promotion and application of WESP in other SO3removal areas.
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