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Table of Content

    25 January 2018, Volume 40 Issue 1
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    Prediction for the probabilistic distribution parameters of wind speed based on Grey Model
    LI Mudan WANG Yinsong LI Yalingb
    2018, 40(1):  1-4. 
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    On the premise that two parameters of wind speed subject to the Weibull distribution, based on Grey Verhulst Model, a method which is used to predict wind speed distribution parameters is proposed .Firstly, historical wind speed data was measured and fitted monthly. The average wind speed and standard deviation were substituted into the Weibull distribution equation to calculate the annual distribution parameters and the calculated prediction data are tested and analyzed. Then, the prediction data are substituted into Grey Verhulst Model for comparison and analysis. Finally, the wind speed distribution parameters of future years are predicted based on the historical regularity. Numerical results indicate that the Grey Verhulst Model can calculate highly accurate distribution parameters within fewer historical data.  This model can provide certain theoretical basis for the wind farm resource assessment.
    Study on characteristics of uniformity optimization on pulverized coal flow in a Wflame boiler
    WU Yue
    2018, 40(1):  5-9. 
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    It explored the regulating characteristics of baffle plate to pulverized coal flow in primary air pipe. By adjusting the baffle plate, the deviation of pulverized coal flow decreased and uniformity of pulverized coal flow was optimized. The temperature of furnace center reduced nearly 40 degrees Celsius, the temperature deviation in the middle region of economizer outlet reduced 10.67 degrees Celsius, the oxygen deviation at economizer outlet reduced 1.16%, the emissions of NOx reduced 16.79μL/L. All burners was running smoothly and over temperature problem on reheater tube was solved. It showed that uniformity optimization of pulverized coal flow was good for reducing deviation of flame, furnace heat load and steam temperature and possibility of high temperature corrosion and cracking accidents. Reducing temperature at furnace center and stable combustion made reasonable air supply and stable combustion along the furnace width will make the cooperation of wind and powder more reasonable, which can reduce NOx generation and improves the combustion condition of the furnace (especially in the middle of the furnace)
    Calculation of ice thickness of overhead transmission lines
    LI Guiming
    2018, 40(1):  10-12. 
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    Through establishing icing thickness mechanical models for overhead transmission lines, the formula for calculating the ice thickness of lines and wire sag is derived. Using the formula, thickness of the ice coating of ±800kV Fufeng line in Hunan region was calculated. Comparing the calculating results with field test results, the calculation error was 9.02%. The model can be used to predict the thickness of wire ice coating in advance, and provides a preliminary warning for icing protection.
    Applications and characteristics of BS-I pitot tube
    LIU Guanqing1, CAO Wenguang1, ZHANG Gaoshan2，HUA Liang3，SHI Zhansheng1, MA Zhian1, ZOU Chongen1
    2018, 40(1):  13-15. 
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    It is recommended by a standards of electric power that BS-I pitot tube is a measuring device that can be directly used in gas velocity in pulverized coal pipes. The correction of measuring based on the mass concentration of coal powders is not required and it is not easy to deposit ash. Insitu test on the BS-I pitot tube indicated that the measurement performance and accuracy are in line with expectations. Numerical computations with CFD were then conducted to investigate the BS-I pitot tube’s characters and the effect of relative attitude (rotation, inclination) and the degree of main pressure pipe to the velocity coefficient under measurement. The results showed that the measuring accuracy of BS-I pitot tube was insensitive to these factors.
    Anticorrosion optimization of reinforced concrete single tube chimney in wet desulfurization condition
    JIA Jungang1，CHAI Jun1，WANG Richao2，WANG Jinxing3，ZHAO Jingzhong4，LIU Fei4
    2018, 40(1):  16-18. 
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    Since the coalfired power plant adopts wet desulphurization, reinforced concrete single tube chimney has to be used in new projects. To keep this simple and economic chimney available in electric industry, some anticorrosion optimizing measures for chimney structure are proposed after numerous researches were taken on domestic coalfired power plant in current condition and chemical analysis of the flue gas condensation acid was made: using the impermeable concrete cylinder body, sticking two layers of cloth and five glue painting in the lining tube body as seepage prevention and anticorrosion insulation, lining with belt tongueandgroove hydrophobic acidproof brick, closing to the building form of isolation layer. The 210m chimney of Shanxi Guojin Coal Power Company Limited took this measure which is acid resistant and corrosion resistant, and economically applicable. There is no seepage after 3years operation.
    Analysis on transformation of electrically driven feed pump in 150MW heating unit in Wuda Heating and Power Plant
    GUO Yafeng1, LIU Chunsong2, WANG Dongchuan1
    2018, 40(1):  19-21. 
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    It introduced the first application of the high voltage converter that independent researched used in feed water pump system in Huadian Group. It included the main principle of high voltage converter and the frequency conversion renovation scheme of feed water pump .By timing the adjusting time of transmit pipe and calculate the drum water level time, a standby pump scheme is adopted after determining the failure of high voltage inverte. Finally, through the statistics and comparison of the onsite operation data, the energy saving effect is obvious after transformation. Annual electricity savings of 1.783 million yuan. It is worthy to be promoted inside Huadian Group.
    Analysis and treatment of the tripping cause of a 1000MW unit boiler air preheater
    HAN Lina, LI Shaogang
    2018, 40(1):  22-26. 
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    Based on the example of Huadian Laizhou Power Generation Company Limited’s 2×1000MW coalfired unit, the incident of air preheater runback (RB) was introduced. Analyzing the cause of the trip, detailed preventive measures were provided, which can secure the operation of the unit.
    IEC61850based localized protection intelligent management unit interoperate problem analysis and treatment
    QIAN Wei, RUI Guojun, LUO Zhaojun, LIU Wenbiao
    2018, 40(1):  22-26. 
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    Localized protection intelligent management unit generated with localized protection device. Intelligent management unit and localized protection adopted IEC 61850 protocol. During interoperation, function of intelligent management unit was influenced by protection device model and differences, especially the interoperation of reviewing and valuing of string type data. After analyzing these two problems, solution was provided accordingly. Correctness and reliability was proved in simulation and practical environment.
    Comprehensive management method about arc fault in power systems of large thermal power plant
    WANG Jue
    2018, 40(1):  30-33. 
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    To reduce the damage caused by the arc fault occurred in the 6kV auxiliary power system of large thermal power plant，it should adopt a kind of comprehensive management method including improving the highvoltage transformers resistance to short circuit and using IAC switchgear witch bus protection. It analyses the current status of arc protection device which is based on arc sensor.
    6FA generator primary rotor grounding protection action treatment
    YU Lifan1, CHENG Tu2
    2018, 40(1):  34-35. 
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    The process of 6FA generator brushless excitation system primary rotor grounding protection action treatment was introduced. The process of inspection, analyzing and treating was discussed. Each key pointed was detailed introduced. Which could be refed by similar problem.
    Cause analysis and treatment for jamming of doublestage moving blade adjustable axial flow fan
    ZHANG Shaoxing
    2018, 40(1):  36-38. 
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    After denitration ultralow emissions renovation in Huadian Weifang Power Generation Company Limited, unit #3，#4 doublestage moving blade adjustable axial flow fans have been jammed for several times since the soot on the blade root, and the serious scenario can be blade drifting. The modification to the fan blade sealing can improve the sealing condition of blade root and reliability of fan operation.
    Analysis of common problems in thermal reliability assessment
    WENG Jiang
    2018, 40(1):  39-41. 
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    On the basis of Detailed rules for reliability evaluation of thermal control system of thermal power unit in Huadian Group Corporation (trial) and DL/T 261—2012 The guidelines for the thermal power plant automation system reliability evaluation technology，Huadian Fujian Company exerted specialized inspect and evaluation on the reliability of the equipment, hidden troubles and  loopholes in management in its subordinate units from six aspects，such as thermal control system hardware configuration，software functions and site equipment installation ，thermal independent control device，technical management，and peripheral control system. At the same time, through finding problems timely and making prompt rectification，the possibility of abnormal condition or unplanned outage because of the thermal control system software and hardware equipment cab be reduced fundamentally, which improves the reliability of the thermal technology equipment.
    Initial investigation of online test of transformer pressure relief valve
    ZHU Da
    2018, 40(1):  42-43. 
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    In the operation of transformer pressure relief valve, there is a certain hidden trouble. There is no insitu inspection which can discover and eliminate the hidden trouble in time. An online test is introduced, together with the test method, procedures and matters needing attention. But the online test can only be carried out as qualitative check. It cannot replace the verification of pressure relief valve.
    Pneumatic control valve selection
    YANG Chunming
    2018, 40(1):  44-45. 
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    Control valve is a very common terminal control component in industrial production. Control valve received output signal from controller and control fluid flow to maintain pressure, temperature, level, flow rate and other process variates. To choose a proper valve is critical. The selection of control valve was introduced from pressure differential, structure, flow rate characteristics, aperture, leakage, safety and other aspects.
    Analysis on an abnormal voltage sag of 400V motor
    YE Pengzhen1，SU Xing1，ZHANG Guangyun2
    2018, 40(1):  46-49. 
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    Focusing on a tripping event of a 400V auxiliary under condition of voltage sagging, analysis is made according to the operation mode and fault type, to find out the fundamental cause of the incident. Through calculating the probability of similar incidents since diverse fault, in order to improve the reliability of equipment’s operation, a modified design of 400V devices is proposed.
    Glass fiber reinforced plastics exhaust stack quality control factors and manufacture control key points
    LIU Huiping, SU Qi, LI Peng, ZHANG Yang, SU Hui
    2018, 40(1):  50-52. 
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    With the widespread of glass fiber reinforced plastics exhaust stack in newly built coalfired power plant stack, the quality was concerned. The character of main material of glass fiber reinforced plastics was introduced. Factory test and storage method, design and other factors that affected quality was analyzed. Key point of quality control was summarized.
    Construction technology and application of automatic hydraulic roof lift in high stack titanium steel tube
    LI Fulin
    2018, 40(1):  53-54. 
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    The chimney titanium inner cylinder of Huaneng Qinbei Power Generation Company Limited phase I, use a new technology called automatic hydraulic jacking construction,there is no need to weld sliders on the serface of cylinder titanium, which can effectively ensure grinding, the quality of grinding and titanium strip weld.It introduces the composition and construction scheme of the automatic hydraulic top lift system and the safety of the system. The technology can effectively shorten construction period, save construction cost and guarantee engineering quality.
    Examples of treatments on welding cracks inside the thickwall 12Cr1MoV steel pipe
    LIU Xinying1，LIU Jinqiu1，XIA Xiaotao1，LI Gen1，HAO Guangting2
    2018, 40(1):  55-56. 
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    12Cr1MoV is the most commonly used lowalloy heatresistant steel in electric furnace and its high process performance and reliability has been widely proved. It is commonly applied in making superheater tubers，headers，and pipes a boiler. In this paper，the subcritical boiler is used as an example，and the analysis is focused on the cracks inside the connection pipes between the header and superheater. The solutions provide important experience and guarantees for the 12Cr1MoV steel pipes applied in most of the 300MW units with the largest number in service.
    Large scale coal steel plate silo design and safety protection
    PENG Liyuan, JIANG Chuanfei
    2018, 40(1):  57-58. 
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    To solve the problem of storage limited and easily explosive combustion, a new type of large scale storage with multiple surveillance protection system was introduced. Multiple sensors were adopted to monitor operation condition. The application proved that multiple unloading points increased empty rate and reduced coal deposition. Interlocked surveillance and protection systems ensured the safety of coal storage.
    Analysis of ultralow emission transformation of a 1000MW coalfired unit
    PAN Jianqiang1，YOU Liangzhou2
    2018, 40(1):  59-61. 
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    Taking an ultralow emission transformation project of 2×1000MW coalfired units in Jiangsu as an example, it introduces the denitration, desulfurization technology transformation scheme, demonstrates the feasibility and effectiveness of transformation and the problems should be aware of. The actual data shows that the pollutant indicator after transformation can meet the requirements of ultralow emission.
    Selection and design of temporary chimney placed on the top of desulfurization tower
    XIA Huaipeng, WANG Yang, ZHAO Bing
    2018, 40(1):  62-64. 
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    The structure of the desulphurization tower with a temporary chimney on the top is modeled by the finite element program ANSYS. The structure and load combination are simulated according to the actual situation and the stress and deformation characteristics of the structure under various loading conditions are analyzed. The results show that placing temporary chimney on the top of desulfurization tower is feasible. With finite element program, the stress of the structure can be clearly figured out. According to the results of finite element analysis, reasonable tower wall thickness and internal rod crosssection can be selected and reasonable structural measures are taken to address the vulnerable points, which can achieve design optimization.
    Analysis of regional distributed energy gas turbine unit selection
    SHAO Xufeng
    2018, 40(1):  65-67. 
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    Taking the project of a distributed energy station in Jinhua, Jiangsu Province as an example, a distributed energy plan is proposed within fully investigating the heating situation in the region and the heating demand. On this basis, it analyzed four types of gas turbine models and made a conclusion according to the principle of selection, and provided reference for the construction and unit selection of the same type of distributed energy station.
    Study on heating reform of steam turbine unit
    SUN Jiquan1, XU Tao2, SHANG Yongqiang2
    2018, 40(1):  68-70. 
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    In response to national policies energy conservation and emissions reduction, to meet the demand of civil heating supply modification，2×135MW steam turbine were taken into heatandpower cogeneration transformation. The extraction condensate heating unit was changed into back pressure unit, a new unicom exhaust pipes will consolidate and lead the gas from the 2 upper roads to DN1200mm steam supply line, at the same time extract 5t/h steam ,which after temperature and pressure reduction, will be cooled in the low pressure cylinder. Compared the parameters and main economic indicators before and after modification, the project can save about 9.4kt of standard coal every year, which reduce the consumption of coal and smoke in the region.
    Retrofitting of flue pipe mist eliminator of 330MW thermal power unit
    XING Hao, ZHENG Xifeng
    2018, 40(1):  71-72. 
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    With constant improvement of the national environmental protection requirements and increasingly strict air pollutants emission standards on coalfired power plant, soot have become the priority of environmental upgrade project in thermal power plants, besides sulfur dioxide and nitrogen oxides. In Huadian Luohe Power Generation Company Limited 330MW thermal power unit, the quality concentration of the droplet at the outlet of desulfurization device fluctuates greatly.The retrofitting scheme of twostage mist eliminator at the tail of desulphurizing flue is settled with experimental demonstration.After mist eliminator is installed on purifying flue,the quality concentration of smoke emission at the chimney inlet drops to 30mg/m3.
    Technological and economic analysis about ultralow emission of dust from a 200MW coalfired unit
    ZHU Wentao, WANG Jianfeng, HU Da, LIU Qiang
    2018, 40(1):  73-76. 
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    Taking a dust emission reduction transformation of 2×200MW coalfired units in Xinjiang region as an example, it make a comparison with wet ESP technology and efficient desulfurization dust removal technology. Both of all can make the outlet dust emission concentration lower than the requirement, 5mg/m3(the state, dry basis, 6% O2): wet ESP technology can be more adaptable to wide variety of flue gas load, but investment and operation and maintenance costs were higher than efficient desulfurization dust removal technology; while efficient desulfurization dust removal technology possesses a lower investment and lower running cost.
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