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Table of Content

    25 August 2018, Volume 40 Issue 8
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    The feasibility study on GFS rainfall forecast for flood forecasting in Gutian Basin
    YE Ziguo1, LI Chunhong2, WANG Rui2, RUAN Honghua1
    2018, 40(8):  1-4. 
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    Based on the actual information of rainstorm and flood in the Gutian River Basin in June 2017, the accuracy of global forecasting system(GFS) rainfall forecast was analyzed from the inspection of meteorological quality and relative error of forecasting during flood season. The flood forecast based on GFS rainfall forecast was carried out. The results show that the forecast accuracy and forecast period of flood are obviously improved combined with GFS rainfall forecast compared with that of uncombined GFS.
    Monitoring  analysis and feature extraction of rolling bear full life data
    RUI Xiaoming，HU Xin
    2018, 40(8):  5-10. 
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    Based on the simplicity, convenience and powerful data processing function on vibration signal of the matlab language program, the timedomain analysis is performed on detected rolling bearing vibration signal. In the frequency domain and cepstrum analysis, an energy eigenvalue is used. The signal data is processed, and the trend curves of various eigenvalue parameters are obtained, so that the data of the rolling bearing can be more intuitively monitored and analyzed, and the life prediction can be performed.
    Research and application of efficient coarse powder separator
    SHI Zhansheng1, SUN Zhengrui2, DUAN Cuijia1, CAO Wenguang1, LI Zonghui1, MA Zhian1, FAN Xiaoming2
    2018, 40(8):  11-13. 
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    Coarse powder separator is an important device of a pulverizing system in a coalfired power plant. The merits and drawbacks of the available radial and axial coarse powder separator are studied and analyzed. A new coarse powder separator is proposed. The new coarse powder separator makes the best of its effective space and introducesa centrifugal separating module creatively which eliminates bumping separation, enhances centrifugal separation, and solves the wear of inner cone and particles accumulation. The results of demonstration show that output of pulverizing system, separation efficiency and uniformity of pulverized coal are greatly increased, and the pressure drop of the separator, fineness of the pulverized coal, cycle ratio and power consumption of the primary fan are significantly reduced. Soft material blockage isalmost solved as well.
    Design and application of robotic coal sampling system
    WEI Jiadong1, CUI Xiuqiang2
    2018, 40(8):  14-17. 
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    With the rapid development of industrial robot technology in China,industrial robots have been widely used in many fields. In the fuel intelligentization of thermal power generation industry, the feasibility, design and precautions of industrial robot technology in coal automated sampling and analysis system are mainly discussed. A new intelligent sampling system which can realize sample preparation, sample packaging, code recognition and moisture detection by utilizing general industrial robot technology is proposed. The robotic sampling system can be applied to the coal intelligent sampling system, and can also be used alone in the coal sampling room, so that the preparation, detection and other processes of the coal sampling can be intelligent, unmanned, standardized and dustfree.
    Discussion of the new structural form called ‘foreside wiring and foreside display’
    GU Jinshu, YU Chunlin, YUAN Difei
    2018, 40(8):  18-20. 
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    In order to meet the construction requirements of intelligent substation,considering the characteristic and using habit of secondary device in prefabricated cabin, it proposes  a new structural form of secondary device called ‘foreside wiring and foreside display’. It makes secondary device’s installing, wiring and operating in front of panel realizable. Using this in cabin, the space of prefabricated cabin can be maximize, the floor space of intelligent substation can be reduced. In that case, this form could impel the miniaturization of intelligent substation.
    Method for improving measurement accuracy of soft ground backfilling project
    HUANG Chengbin, ZHANG Yulin
    2018, 40(8):  21-22. 
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    There is a thick layer of silt and silty clay in the shallow subgrade of a coalfired power plant in Vietnam. A large amount of sandblowing backfilling work is required. According to the measurement method provided by the construction contract, there is disparity between the total amount of work measured the contractor and subcontractor. Through analysis, it is determined that the measurement method, measuring point arrangement and calculation method are the main factors affecting the measurement accuracy. The measures such as rationally arranging the ground subsidence observation symbol, improving the observation method, improving the measuring point arrangement and the standardizing calculation method are proposed. The accuracy of work amount measurement is effectively improved, the disputes on measurement are resolved, the interests of both parties are protected, and the project is smoothly implemented.
    The influence and prevention measure for the integration of IDF and BF in the boiler furnace and flue gas system
    TANG Guorui, YOU Liangzhou, LI Zhuang
    2018, 40(8):  23-25. 
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    With the prevalence of ultralow emission reformon flue gas, the integration of induced draft fan (IDF) and boost fan (BF) in the power plant is commonly applied in power stations. Based on the DL/T 5240—2010 Technical Code for Design and Calculation of Combustion System of Fossilfried Power Plant, a safety assessment on the boiler furnace and flue gas system of a 330MW unit was carried out.  It was found that the possibility of internal explosion of boiler furnace and flue gas system caused by highpressure largeflow IDF was increased. It is suggested that by optimizing the design and selection of the IDF, optimizing the resistance of the flue gas system and improving the pressure protection system of thermal control, the probability of internal explosion of boiler furnace and flue gas system could be reduced.
    Cause analysis on tube bursting since hightemperature overheating in a 300MW subcritical boiler
    GAO Qinglin1，GUO Kaisheng2
    2018, 40(8):  26-27. 
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    Based on the macromorphological analysis, chemical composition analysis, metallographic strcture analysis and mechanical property analysis, a tube bursting since hightemperature overheating in a 300MW subcritical boiler of a power plant is analyzed. It turns out that the tube bursting is due to both longterm over temperature and shortterm overheating (tube blocked by foreign matter).
    Analysis of measures to improve the economy of 6FA combined cycle unit during nighttime shutdown
    ZHOU Yimin, WU Minjie
    2018, 40(8):  28-30. 
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    In order to reduce the power consumption rate of the auxiliary machine during shutdown of the 6FA gas turbine combined cycle unit in night, and improve the economic performance of the gas turbine units’ running mode which is running by day and stop by night, the shutdown cooling water pump is used to replace the closed cooling water pump during the nightly shutdown. The measure reduced the operating costs of the unit. After the optimization, the nightly power consumption rate of auxiliary mechanical was reduced from the 35.0% to 22.8%, and the cost was reduced by 8562 yuan per month.
    Ground point principle and case analysis of current transformer
    DU Xilai
    2018, 40(8):  31-33. 
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    Measured circuits shunts caused by twopoint grounding of the current transformer secondary winding, leaded to malfunction of main transformer differential protection. Aiming at the accident, analysis on possible current transformer false wiring was made at the scene. It expounds the importance and necessity that only onepoint ground of current transformer secondary circuit is the allowed in the protection cabinet screen.
    Cause analysis of highlevel dissolved oxygen in condensate water of a 660MW unit
    SHANG Ziwen
    2018, 40(8):  34-35. 
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    In the daily operation of condensing units, highlevel dissolved oxygen in condensate water will affect the economy and safety of the unit. In the addressing process onhighlevel dissolved oxygen in condensate water of a power plant, the vacuum tightness, supercooling degree, mechanical sealing of the condensate pump, valve sealing and other aspects are investigated one by one to detect the direct factors affecting this index. Some suggestions are provide as references in dealing with similar cases.
    Discussion on operation and maintenance management mode of centralized cooling/heating system in thermal power plant
    WANG Jie, WANG Aiming
    2018, 40(8):  36-38. 
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    Most modern largescale thermal power plants adopt centralized control mode for their operation management. Spot inspection combined with regular maintenance is commonly used in the equipment maintenance management. With the widespread application of energyefficient centralized cooling/heating systems with water source heat pump in thermal power plants, there is contradiction between existing management method and the operation and maintenance management of complex equipment system. The overall outsourcing operation is put forward as the operation and maintenance method for HVAC system of the thermal power plant. The advantages and disadvantages of this management method are analyzed and the corresponding optimization strategies are proposed. Practice has proved that this management method can ensure the higher reliability and economy of the HVAC system operation.
    Brief analysis of LGGH operation and maintenance in thermal power plant
    YU Zhongyong
    2018, 40(8):  39-41. 
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    It introduces the application of lowtemperature gasgas heater (LGGH) in thermal power plants. In order to solve the existing defects such as leakage, corrosion and blockage, it is necessary to improve the monitoring, analysis and adjustment during operation. During overhaul period, it is necessary to optimize the flow guide plate at the entrance of the cooler, to clean, check, flush, troubleshoot , measure and evaluate the heat exchanger, so as to improve the safety and reliability of the lowtemperature gasgas heater.
    Cause analysis and treatment on vibration abnormality of cogeneration steam turbine generator sets
    2018, 40(8):  42-43. 
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    A few days after the operation of a cogeneration steam turbine generator set in a power plant, there was abnormal generator vibration, which would reduce the operation load and affect the safety, stable operation and economic benefits of the units. Through the vibration diagnosis analysis, it was found that the vibration abnormality was caused by the misalignment of rotor and the inadequate contact area of the generator foot gasket. After realigning and replacing the gasket of appropriate size, the vibration of the generator set is abated, which would avoid furtherdeterioration of the problem and would effectively ensures the safe operation of the equipment.
    Application of fault recording in DS6000 system
    LI Dejun, SHEN Quan
    2018, 40(8):  44-46. 
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    The function of DS6000 system and fault recording data is introduced. The realization process of ground fault analysis function in DS6000 system is expounded. Finally, the importance and function of fault recording data in DS6000 distribution automation system are illustrated by actual cases.
    Causes and countermeasures of MGGH leakage
    ZHU Xueping
    2018, 40(8):  47-49. 
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    After ultralow emission modifications for power plants, chimney anticorrosion and ‘white smoke’ come out due to the cancellation of gasgas heater (GGH).Most of the power plant will add a lowlow temperature flue gas heat exchanger (MGGH).However, for reasons of design, installation and so on, there will be MGGH leakage during operation, which will cause ash accumulation and increase of resistance, short circuit  of electrostatic precipitation, dry ash removal system blockage and so on. Serious leakage will even affect the discharge of smoke and dust. It analyzes the reasons for the leakage of MGGH, and formulating countermeasures which provide reference for the relevant problems.
    Analysis and treatment on abnormal sound from supporting bearing of quadsector air preheater
    CHEN Jianfei
    2018, 40(8):  50-51. 
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    It analyzes the causesof abnormal sound of the singleseries quadsector rotary air preheater during the installation and commissioning. By checking the bearings and the contact surfaces and reinforcing the supporting structure, major hidden dangers affecting the operation of the units can be eliminated. It provides reference for the installation and debugging of same type air preheater in new power plants.
    Prevention measures for pipe bursting of water wall of 600MW ultrasupercritical boilers
    XIA Xuemin
    2018, 40(8):  52-53. 
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    There has been several bursting and leakage accidents occurred on water wall pipes of the 600MW ultrasupercritical unit in Liaoning Huadian Tieling Power Generation Company Limited. Considering from the operation, methods such as the throttle orifice at the inlet of antiflushing water wall, the improvement of steam water quality, alteration of sliding pressure operation curve and the improvement of daily operation (stop and start)of units and are proposed. Measures effectively prevent the water wall from bursting, greatly reduce the unplanned outages and significantly improve the economic benefits.
    Reason analysis and prevention scheme of tube blowing loss in lowtemperature reheater
    WU Xiaoming, GUAN Xiangfeng, JIAO Yulong, SUN Zhengrui
    2018, 40(8):  54-56. 
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    When Huadian Weifang Power Generation Company Limited took part in an antiwear and explosionproof inspection on a secondphase power plant boiler, it was found that the lowtemperature reheater suffered a serious blowing. Inspection on the heating area was carried out to found out whether the narrow spacing between the soot blower and the tube rows, the installation defect of protecting tile were the key factors causing blowing loss on the heating surface. According to these factors, the optimized installation process of the upper protecting tile, the installation of the “L” shield at the lower part, and reduce the frequency of soot blows are recommended.
    Brief analysis of making redundancy and upgrading of VP card in DEH system of 600MW units
    LI Wenxiu
    2018, 40(8):  57-58. 
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    In a digital electrohydraulic control system(DEH) of a power plant’s #1 unit, there had been many faults on linear variable differential transformer(LVDT) and valve position (VP) jamming before the upgrading of LVDT and VP. It puts forward the scheme and practical procedure of a redundancy making and upgrading transformation. After the redundancy making and upgrading transformation, safety and stable operation coefficient of steam turbine is increased.
    Cause analysis and treatment of condenser vacuum system leakage
    YUAN Jie, QIAN Weiwu, SHI Xiaowei, HAN Jingyi
    2018, 40(8):  59-60. 
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    A gassteam combined cycle unit leaked during the normal operation of the condenser vacuum system. Indepth theoretical analysis was conducted on the cause of this phenomenon to confirm the effect of the condenser vacuum system leakage on the vacuum. Due to the variety of leakage detection methods commonly used at present, the selection of appropriate treatment solutions can solve the problem and provide a reference for other companies in addressing the condenser vacuum system leakage.
    Application and analysis of new coal contained wastewater treatment system in thermal power plant
    CAO Xuesong, XU Xiangnan, YANG Baosen
    2018, 40(8):  61-65. 
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    According to the reformation project of coalcontained wastewater treatment in Dalian Power Plant of Huaneng Power International Company Limited, a new coalcontaining wastewater treatment system is compared with the old one. It expounds the deficiency of domestic coal wastewater treatment technology in actual operation. It also introduces the treatment principle, process flow, energy saving, emission reduction effect of the new treatment system and the technical advantages of the new system. At the same time, problems in the actual operation of the system are analyzed and solved by data access and field test. Reasonable suggestions are put forward to make further improvement on the efficiency and safety of the whole system. The continuous addition of flocculating agent is solved and the economic performance is improved.The proposed optimization scheme reduces security risks, improves treatment efficiency and improves treatment effect.
    Technical comparison and selection for generation scheme with waste heat of blast furnace gas
    ZHAO Qicheng1， YUE Daiwei2,LI Peng1
    2018, 40(8):  66-68. 
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    According to the status quo of blast furnace gas in a small iron enterprise, comparison of generation technique between gas turbine/combined cycle generation, internal combustion engine and gas boiler with steam turbine are made, and so are the analyses on corresponding advantages and disadvantages. A feasible technical scheme is proposed, which provides reference for small iron enterprise waste heat utilization,energy saving and pollutant emissions reduction.
    Optimization and reform of flue gas continuous emission monitoring system
    YAN Huanhuan
    2018, 40(8):  69-71. 
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    After the ultralow emission reform on 2×660MW units in a power plant, the power consumption for desulfurization of the #4 unit is 0.2～0.3 percentage point higher than that of the #3 unit. Through analysis, it is determined that the high power consumption for desulfurization of the #4 unit is caused by the uneven gas flow field in the clean gas pipe and the inaccurate measurement of the flue gas by continuous emission monitoring system (CEMS). According to the analysis results, the baffle is added, reasonable sampling position is reselected and sampling probe is prolonged. After the reform, the measurement accuracy of CEMS is obviously improved, which can meet the requirements of operational monitoring and environmental monitoring. Energy saving and consumption reduction is obvious.
    Application of flue gas condensation technology in ultralow emission project of thermal power plants
    WU Chong, WANG Zhengrong
    2018, 40(8):  72-73. 
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    It introduces the basic principle of flue gas condensation technology in desulfurization tower and application of design parameters in ultralow emission units. It analyzes the operation effects, and draws corresponding conclusions.
    Effect of WFGD device on PAHs emission characteristics
    XIN Xiaoying, ZHU Wentao,HU Da
    2018, 40(8):  74-76. 
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    Taking a 600MW coalfired unit limestonegypsum wet flue gas desulfurization (WFGD) system as an example, the polycyclic aromatic hydrocarbons (PAHs) carried within flue gas and flue gas particulate at inlets and outlets were tested and compared. The alteration of PAHs concentration at inlets and outlets of WFGD system are analyzed. The test results show that PAHs concentration carried within flue gas is 1126.7ng/m3 and more than 66.8% of it is distributed in flue gas particulate. The removal rate of WFGD system to PAHs is 60% and the removal rate to tetracyclic hydrocarbon and PAHs with five or more membered rings are 68.5% and 59.2% respectively, which is much higher than the removal rate to PAHs with 2 or 3 membered rings.
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