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Table of Content

    25 June 2018, Volume 40 Issue 6
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    Simulation research on imbalance fault in the rotor of variablespeed constantfrequency wind turbine
    LIU Lin, GUO Peng
    2018, 40(6):  1-6. 
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    There are disadvantages in the diagnotic method of wind rotor imbalance fault based on the vibration signal, which are in great demands for sensors, of high cost and poor reliability. Matlab and Simulink are used to build the models of units under normal and unbalanced conditions respectively. Taken the second wind speed data measured in a real wind farm as simulation input, output power is obtained. Results of frequency domain analysis indicates that output power signals of wind rotor includes first frequency component during imbalance fault. After empirical mode decomposition (EMD), output power contains different energy values in different frequency bands. The amplitude of first frequency component and the EMD energy entropies are used as the evidence of fault. Relationship between fault severity and two evidences mentioned above are obtained by numerical fitting ，which realizes the fault diagnosis without requirements for expensive sensors.
    Study on equipment condition monitoring and fault warning in thermal power plants
    XIE Xiaopeng1，LIN Yueting2，LIN Yingming2
    2018, 40(6):  7-9. 
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    Taking the condition monitoring and fault warning of a thermal power plant as researching subject，the application of Gaussian mixture algorithm and Kmeans algorithm in the research of equipment condition monitoring and fault warning is mainly discussed. It introduces architecture of the whole system, research subjective, design ideas, technical requirements and technical highlights. And it analyzes the application effect of equipment condition monitoring and fault warning system in power plants.
    Highvoltage motor power factor compensation based on nonlinear fitting
    LIANG Weiping, NIU Botong
    2018, 40(6):  10-14. 
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    Local compensation for reactive power of asynchronous motors is an economical and efficient power factor compensation method. It introduces the principle of compensation for motors and current calculation method of compensation capacity. Taking a YKK7104 high voltage primary air fan of a power station as the prototype, the Matlab simulation is carried out under the condition different load factor. If highvoltage motors are in light load, the compensation of motor that is calculated according to rated capacity performs poor. It puts forward a compensation capacity fitting method based on the optimum compensation data. Based on the Matlab toolkit which provides nonlinear fitting data, the optimum experimental data are processed .The error rates of fitting curve of compensation capacity and load rate are less than 1%. The fitting curves of compensation capacity at 30%, 50%, 70% and 90% working load are verified. The fitting curves at 35% and 75% load rates are also verified. The compensation results obtained in the experiment reach 94%~95% of the requirements, which proves that this method can give a more accurate compensation to a specific motor under different load rates in the practice.
    Online evaluation system of automatic regulation loops based on SIS platform
    WANG Feng， PAN Mengyao，CHEN Shaowei
    2018, 40(6):  15-18. 
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    For the purpose of deepening SIS data applications, brief introduction of automatic regulation loops applied on online evaluation system is given. The software and hardware environment required by the evaluation system is put forward. The certainty evaluation index is analyzed and certainty evaluation results of the loop are given. Randomness evaluation index based on minimum variance control is analyzed and randomness evaluation results of the loop are given. Model identification and parameters optimization principles of the control loops are summarized and the results are given. The analysis and statistics of AGC and primary frequency regulation, as well as other statistics reporting functions are introduced. Putting the online evaluation system of automatic regulation loops into use has great practical meaning to optimization, administration and maintenance of thermal power plants.
    Charging load prediction of electric vehicles based on Monte Carlo simulation
    QIAO Wenjuan
    2018, 40(6):  19-22. 
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    Prediction is made mainly according to the load generated by charging of various types of electric vehicles in group. Based on the current state of the development of China’s electric vehicles, electric vehicles are divided into four categories on the basis of purpose which are electric buses, electric taxis, electric official cars and electric private cars.Different types of electric vehicles have different charging characteristics, charging methods and charging time. The initial state of charge (SOC) and the initial charge time are extracted by using the Monte Carlo simulation method. The charge loads of four types of electric vehicles are calculated and the corresponding load characteristic curve is simulated in C++ language, where then overall load curve is obtained. By analyzing the characteristics of the load curve, the overall trend of electric vehicle charging load in the future is obtained, which will provide guidance for the rapid development and construction of electric vehicle.
    Regular deviation analysis and treatment of tube explosions caused by oxide scale clogging at final superheater of boilers
    CHEN Yongsheng
    2018, 40(6):  23-25. 
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    After the operation of the #2 boiler in a power plant, tube explosion caused by oxide scale clogging at final superheater has occurred many times. The explosion part of tube is analyzed and found to have regular deviation. Through investigation, the main reason for the deviation is improper pouring of thermal insulation castable material. It will lead to a change in the smoke flow field and the formation of flue gas corridor caused by central ash. By modifying the structure of the thermal insulation castable, the problem of ash accumulation and flue gas corridor in the central part is solved, and the hidden danger of the explosion tube can be eliminated.
    The maloperation of common variable ratio differential protection caused by the main transformer zero sequence CT disconnection
    ZHANG Xuefeng
    2018, 40(6):  26-27. 
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    It analyzes an accident due to the disconnected point of zerosequence CT circuit of a main transformer on the power plant side. When a singlephase ground fault occurs outside the grid side zone, it leads to a utility variable ratio differential protection. It reveals that if there is disconnected point in a zerosequence CT secondary side, the induced secondary high voltage may affect the adjacent AC sampling loop. Analyzing the typical wave characters of this accident, specific preventive measures are put forward as references for the unknown accident.
    Brief introduction of Shenhua coal’s mix burning by 630MW lean coal boiler
    LI Mingyu1, SHEN Xinfeng1, QIAO Yongsheng1, L Hongbiao2, DING Min1
    2018, 40(6):  28-31. 
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    A 630MW coalfired power station adopts lean coal as design coal. The lean coal are combusted with coal of similar qualities in the long term after being put into production and the blended coal quality varied greatly from its design quality. Analyzing the cases in which Shenhua coal is blended and combusted, it is proved that the mixed burning ratio of this coal can be increased since it is safe, environmentally protecting, longterm and economic after examinations.
    Measurement error analysis of online hydrogen conductivity meter
    ZHOU Yang，LI Liang，YU Yang，LIU Qinghua
    2018, 40(6):  32-34. 
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    It analyzes the influences on online hydrogen conductivity monitors brought by cationic resin, temperature compensation, electrode constant, electrode polarization and capacity effect. It suggestes that online hydrogen conductivity instrument should take the reasons above into consideration during its downtime. It should analysis the error factors precisely, take appropriate measures and improves the measurement accuracy.
    Failure analysis and preventive measures of S109FA gassteam turbine warm start  up
    WAN Zhiyong
    2018, 40(6):  35-37. 
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    Taking the warm startup failure of an S109FA gas steam combined cycle units made by an American company, GE, as an example, the reasons for temperature difference between top and bottom of high and middle pressure cylinder arranged in system is analyzed after the stop of the steam turbine. By shutting down, breaking the vacuum , stopping shaft seal and then close the high/middle pressure diverging valve, the temperature difference between top and bottom of high and middle pressure cylinder can be reduced, which can avoid the startup failure caused by upper and lower cylinder temperature difference.
    Analysis of actual operation effect of pulse power supply
    WANG Zhicheng, ZHAO Feng, ZHANG Bojun, ZHANG Deben
    2018, 40(6):  38-40. 
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    In order to study the actual operation effect of the pulse power supply, the power supply parameters of the pulse power supply in actual operation are analyzed. When the precipitators are powered by the pulse power supply, the dust emission concentration at outlet are reduced by 50% or so. The pulse power supply also have a good control on PM2.5. During the operation of pulse power supply, it can effectively reduce the secondary current and increase the effective secondary total voltage. It also has a better energysaving effect and improves the removal of fine dust. Thus, the pulse power supply can be used as an effective measure for fine dust and PM2.5 removal.
    Common fault treatment and optimization of oil pressure device
    TIAN Xiaobing，ZHANG Yi
    2018, 40(6):  41-43. 
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    Goupitan Power Plant which is run by Wujiang Hydropower Development Company Limited. has experienced a high faulty rate on oil pressure equipment of speed regulation system after starting up.Because of multiple leakages, oil pump vibration, abnormal loading/unloading condition of oil pump and unreasonable operation mode of oil pump, it cannot meet the requirement of economic operation. According to the situation above, improvement is made from the equipment sealing transformation and control procedure optimization. It greatly improves the economic efficiency of the oil pressure device, and completely avoids the leakage caused by the defect of equipment, which has certain promotion value.
    Unplanned outage analysis and optimization of circulating water control system of a unit
    CHEN Chunlin， YUAN Shitong
    2018, 40(6):  44-46. 
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    Circulating water system is a basic system of a thermal power unit. The control quality of the system is directly related to the safety and economy of unit operation. It analyzes the direct and indirect causes of unplanned outage caused by the trip of circulating water pump. The control logic optimization is made on circulating water pump, circulating pump outlet butterfly valve and pump power cabinet. Advice on maintenance of butterflyvalve power station at pump outlet is proposed.It improves the safety and reliability of unit operation.
    Implementation of status monitoring system based on realtime database
    TIAN Tian
    2018, 40(6):  47-48. 
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    The importance of the realtime database system and problems existing in the system are introduced. It points out the existing disadvantages of realtime database system in daily maintenance. By construction of state monitoring system based on realtime database system, it realizes the whole process state acquisition which includes production data acquisition, transmission, data stored and application. It meets the power plants’ monitoring requirements for hardware, software and network environment crossing different security regions. The maintenance mode turns from passive maintenance to active maintenance, in order to achieve ‘timely detection, rapid identification, accurate positioning and instant recovery’ of the faults in realtime database.
    Analysis and research on the leaking causes of fuel triple duty valves
    HE Zhongcai
    2018, 40(6):  49-50. 
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    There are oil side leakage, steam side internal leakage and external leakage in the practical operation of fuel triple duty valves of 300MW boiler frequently which affects the normal start of the unit. By adopting appropriate sealing material, improving the structure of triple duty valves and decreasing the atomization steam pressure in front of furnace, the oil side leakage, steam side internal leakage and external leakage offuel triple duty valves can be avoided, which can ensure safe and stable operation of equipment.
    Application and case analysis of generator stator ground protection
    ZOU Hailong，YAN Pengfei
    2018, 40(6):  51-53. 
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    It briefly explains the principle of generator stator ground protection. Analyzing living examples of generator stator ground protection, the fault point is searched and the cause of the determined. It is of great significance to the safe operation and accident treatment of the same type of generating unit.
    Research for light portabletower climbing equipment
    WANG Zhijun，LI Yi，MEI Jia，WEI Xiaodong，LI Xuebin，YANG Junning
    2018, 40(6):  54-55. 
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    With the construction of ultrahigh voltage(UHV) transmission line, the maintenance workload of transmission towers become heavier， which proposes a higher requirements on the tower climbing equipment. Accordingly, mechanical analysis should be performed on the lightweighted and modular design of existing equipment. It shows that its performance and security meet the design requirements. The equipment can be used on tower climbing maintenance work of UHV lines and other transmission towers’ maintenance. Its favored portability and performance can improve the efficiency and security in maintenance working and reduce the labor intensity.
    Optimization strategy of PCV valve control system for supercritical unit
    KE Zhao，HAO Han，WANG Gang
    2018, 40(6):  56-57. 
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    There was a false opening during the operation of pressure control valve (PCV) of 680MW ultrasupercritical unit of Hubei Xisaishan Power Generation Company Limited. The cause of the failure is analyzed and a scheme which includes signal isolation grid, increasing decision circuit , partially reformation on circuits are put forward, which effectively improved the reliability of PCV valve control system.
    Analysis and treatment of high temperature of bearing of primary air fan motor in 660MW singleseries unit
    CHEN Jianfei
    2018, 40(6):  58-59. 
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    During the debugging of the 660MW singleseries unit of Ningxia Guohua Ningdong Power Generation Company Limited, the temperature of the bearing of the primary fan motor is high and there is a risk of forced shutdown. Checking the bearing at the motor drive end after the shutdown, it was found that the bearing wear was serious and the assembly clearance of the bearing was unreasonable. Adjusting the gap between the bearings edges, adjusting the coaxial degree between the pressure packing cover and the shaft, and increase the diameter of the fuel charging throttle valve plate, can effectively eliminate the phenomenon of the motor bearing high temperature, which ensures the safe and stable operation of unit.
    Feasibility analysis and research on the modification scheme on desulfurization equipment of thermal power plant
    XU Qi，ZHANG Yan
    2018, 40(6):  60-62. 
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    The transformation of desulfurization equipment of thermal power unit is becoming more and more urgent for the problem of substandard emission concentration from the most power plants. The feasible transformation scheme of 2×600MW supercritical units’ desulphurization device of a coalfired power plant is analyzed and studied. Based on desulfurization efficiency experiment, two schemes which are twin tower double circulation and single tower are proposed. Technological and economic analyze of these two schemes are made and compared. Meanwhile, by comprehensively considering the influence factors, such as technology risk, transforming difficulty, transformation period, site area and project investment, twin tower modification scheme is identified as a more suitable scheme. It provided reference for the transformation of the denitrification device for domestic thermal power unit in the future.
    Application of highsalinity wastewater zero discharge and salt separation technology
    LI Hongxiu1，FAN Xiaopeng2，LIU Zhijiang3，LI Wenjie1
    2018, 40(6):  63-65. 
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    After the water consumption revamping and cascading using, the wastewater with high salinity must be treated by highefficiency chemical soften device, nanofiltration, multistage reverse osmosis system, disk tube reverse osmosis and forced circulation crystallizer before meeting the requirement of makeup water of circulating water. At the same time, industrial salt is obtained whose purity is up to 98.5%. The technology can provide reference for zero discharge of highsalinity waste water in thermal power plants.
    Design characteristics of clean flue pipe support in wet flue gas desulfurization project of China Resources Power Jiaozuo Company Limited
    YANG He1, LIU Fangfang1, ZHANG Caoqing2, YU Xingliang2, LIU Zhaobin3
    2018, 40(6):  66-67. 
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    It expounds the insufficiency of current clean flue pipe support in desulfurization project and the design characteristics of 2×660MW supercritical unit flue gas desulfurization project. This design does not need to consider the floor space, and does not need to provide concrete or steel structure support for the clean flue, which can reduce the investment cost and construction difficulty, effectively shorten the construction period and reduce the influence on the chimney foundation. It can provide reference for similar projects.
    Application and comparison of SCR, SNCR and SNCR/SCR flue gas denitration technology
    WANG Jihua
    2018, 40(6):  68-70. 
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    The principle, layout, performance index and the engineering application of selective catalytic reduction (SCR), selective non catalytic reduction (SNCR) and SNCRSCR hybrid denitrification for coalfired power plant have been briefly presented. Comparing the three kinds of denitration technology comprehensively, three kinds of control system configuration schemes of denitrification are provided, which can provide reference for the choice of denitrification scheme and control mode.
    Analysis of white smoke after operation of SNCR in waste incineration power plant
    ZHANG Hui
    2018, 40(6):  71-72. 
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    After the operation of selective noncatalytic reduction (SNCR)，there is  white smoke appeared above the chimney of the power plant . By analyzing the white smoke, the composition of it is determined as ammonium chloride. With the experimental method including ammonia escape laser spectrum analyzer and flue gas automatic monitoring system, the formation characteristic of NH3Cl is analyzed. Control strategy of SNCR ammonia spraying is made so as to effectively restrain the formation of white smoke.
    Process and optimization of pipe blowing of heat recovery steam generator in gassteam combined cycle unit
    WANG Lin，WANG Hongyu， ZHANG Yafu， GAO Jinghui， MENG Yingqi
    2018, 40(6):  73-76. 
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    In order to improve the efficiency of pipe blowing of heat recovery steam generator and enhance the safety of pipe blowing, a threestage energystorage and depressurization technique is put forward and practiced. The technique can be used to blow the high pressure system associated with medium pressure system, and separated from low pressure system, which ensures the effect of the pipe blowing, and improves the efficiency of the heat recovery steam generator. By reducing the exhaust temperature of the gas turbine, heating rate of heat recovery steam generator is optimized to solve the problem of water hammer in pipes at the initial stage of ignition. Increasing the temperature of exhaust smoke before the formal pipe blowing  can improve the steam parameters, and decrease the fuel consumption and time of blowing process. The results of targeted acceptance show that the pipe blowing works well in the steam system of boilers, and the process of pipe blowing is safe and efficient. Relevant experience can be used as reference for subsequent similar units.
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