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Table of Content

    25 November 2018, Volume 40 Issue 11
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    Research on data error detection method of heating system sensor
    LI Silu1, LIU Yaowen2, YU Jingping3, FU Qiang2, LIU Haibo2, ZHOU Zhigang4, XUE Puning4, LIU Jing4
    2018, 40(11):  1-4. 
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    In order to improve the accuracy of data uploading by central heating system, the identification method of error data is studied. Three methods including wavelet filtering, median filtering and error back propagation (BP) neural network are applied by the heat exchange station in the heating system. The data uploaded by the first level network traffic sensor are used to detect the error, and the results detected by the three methods are compared. It is concluded that the error detection method with the median filtering is the best.
    Application of ultrasonic beam diffusion theory in TOFD technology
    GUAN Lei，LEI Hai，DING Peng，LI Qin，XU Ling
    2018, 40(11):  5-7. 
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    Time of flight diffraction (TOFD )is used to test the weld. If other parameters are given, a probe with a higher frequency can reduce the height of the surface dead zone to a certain extent. However, considering the theory of sound beam diffusion, the probe with a higher frequency has a smaller sound beam coverage, which hinder full coverage of waves on the welds. Based on the ultrasonic beam diffusion theory, combined with the welding process and other factors, the reasonable probe parameters of work pieces with different thicknesses can be obtained, which can provide reference for relevant personnel to prepare the TOFD detection process.
    Filter circuit analysis and test of localized protection measurement and control device
    ZHANG Baoshan，ZHANG Qunling，CHENG Kejie，YANG Jing，WANG Mengqi，ZHAO Ying
    2018, 40(11):  8-11. 
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    Correct sampling is the key technology to localized protection measurement and control device. According to the requirements of the protection and control device, a lowpass filter circuit with reasonable cutoff frequency should be designed to solve the problem of frequency aliasing. Since passing through the filter circuit will affect the amplitude and phase of the fundamental wave and harmonics, the corresponding compensation parameters need to be correct. It theoretical analysis the filter circuit cutoff frequency, amplitude and frequency characteristics as well as phase frequency characteristics，and protection program based on analytic results is designed. According to the amplitude and phase accuracy of the sampling value output of localization protection measurement and control device , the technical requirements of the localized protection measurement and control device are met.
    Research on the detection technology of corrosion defects on the heating surface tube inner walls of the power station boiler
    ZHU Guobin, JIA Shaowei, WANG Jingwei, JIANG Ye, LIU Wensheng, WANG Dong
    2018, 40(11):  12-16. 
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    Considering the limitation of the corrosion defects detection method for the heating surface tube inner walls of the current boilers in power plants, a special array lowfrequency eddy current probe is designed. Combined with the requirements on the supervision and inspection of the heating tubes of boilers, contrast test tube samples with axial and circumferential artificial defects are made respectively to study the sensitivity of array low frequency eddy current test. Field application shows that the array lowfrequency eddy current test can improve the detection efficiency of corrosion defects on the inner wall of the boiler heating surface tube, with less missing defects.
    Modification of high temperature reheater and its problem solving
    HOU Shengcun, CAO Wei, WU Yuegang, CAO Li
    2018, 40(11):  17-20. 
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    A 600MW supercritical coalfired generator set in a power plant had stopped  many times because of the weld desoldering of inverted Ubend and weld failure of dissimilar steel of hightemperature reheater since the commissioning. In this case, the power plant carried out the inverted Ubend transformation and displacement modification on dissimilar steel welding joints, according to the requirements of the factory. There has been no tube burst caused by inverted Ubend pipe cracking or dissimilar steel welding joints in the 3 years after the modification.The weld cracks of the small header pipe socket of the reheater appeared after transformation, can be solved by patching and repairing welding.
    Control analysis of X criterions before the turbine rushes of 1000MW secondary reheat units
    YE Luo，DIAO Honghu，CUI Xiaoguang
    2018, 40(11):  21-23. 
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    In 2×1000MW ultra supercritical secondary reheat steam turbine unit of second phase of Guodian Taizhou Power Plant, T3000 control system was taken as digital electrohydraulic(DEH)control system.The DEH control system is equipped with thermal state estimator (TSE) for calculating and monitoring the heat stresses of various metal components of steam turbines in different starting modes. The X criterion is one of the basis for the judgment and control of TSE. The proper temperature margin can make the steam turbine have good adaptability and reliability under variable working conditions. By introducing the significance of the X criterion under cold, warm and hot conditions before the turbine rushes, the conditions and methods corresponding to meet X criterions are analyzed, which provides a reference for the smooth turbine rushes of similar type.
    Gas turbine excitation protection action tripping accident analysis and processing
    JIANG Zhihui, WANG Yaokun
    2018, 40(11):  24-26. 
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    The maloperation case of a gas turbine overexcitation protection was analyzed to find out the cause of the protection maloperation. The hidden danger was eliminated by adding a harmonic elimination lowvoltage potential transformer (PT).Countermeasures are proposed to prevent malfunction protection and improve the protecting function.Countermeasures can provide reference for the subsequent problems of the secondary side voltage distortion caused by the ungrounded operation mode of the primary side of the PT.
    Causes and preventive measures for heating surface leakage of waste heat boiler of gas turbine power station
    LU Dingkang, XU Jianguo, QIAN Songfeng
    2018, 40(11):  27-30. 
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    :The reliability of the pressurebearing components of the waste heat boiler of a gas turbine power station determines whether the boiler can operate safely for a long time. Taking a waste heat boiler of a gas turbine power plant as an example, typical cases of heating surface leakage are analyzed, and preventive measures and treatment schemes are proposed, which can provide reference for the inspection and maintenance for the pressurebearing parts of the waste heat boiler.
    Diagnosis of vacuum drop of 680MW ultrasupercritical unit
    DONG Lin1，ZENG Yajie2，SHEN Yang1，LIU Mingxing1，ZHANG Zhiyong1，MA Yong3
    2018, 40(11):  31-33. 
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    In view of the vacuum drop occurred during the operation of unit No.4 in a power plant, the vacuum system was checked for leaks within a helium mass spectrometer. Through leak detection, adjustment and analysis of the suspected areas, it is found that the breakage of the shaft seal pipe of the B steam feed pump turbine is the cause of the vacuum drop. After replacing the shaft seal pipe, the problem of vacuum reduction of the No.4 was effectively solved.The condenser vacuum returned to normal, and the vacuum tightness test passed.
    Static analysis of boom structure of flathead tower crane based on ANSYS
    YU Hongzhu
    2018, 40(11):  34-35. 
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    The mass of the flat arm tower boom takes a large proportion of the whole machine’s. Optimizing the design of the boom structure can greatly improve the economics of the whole machine. The structure of the boom is briefly introduced. By analyzing various working conditions of the boom, the control conditions of the boom are obtained. The limit state method is used in designing and calculating the boom structure，which is verified by ANSYS software. The maximum stress and displacement nephogram of the boom structure under different working conditions are obtained, which can provide data basis for optimizing design for the boom structure.
    Finite element analysis of lower bearing ring beam of PZQ1400 attached selflifting tower crane
    ZHAO Xiaowei，ZHANG Qian，SHI Xiaofei，ZENG Guang
    2018, 40(11):  36-39. 
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    Taking the lower bearing ring beam of PZQ1400 tower crane as the analysis object, it considers two kinds of dangerous working conditions. Via the software Creo, an 3D finite element model of the ring beam is set up and imported into the workbench to carry on the finite element analysis. By comparing with the strength of ring beam obtained by traditional computing,the rationality of model simplification and loading is explained.It provides a method for designingthe structure of the type.
    Boiler and pressure vessel safety supervision in quality supervision stations during the thermal power construction
    HUANG Youchang
    2018, 40(11):  40-41. 
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    :In combination with the thermal power unit installation project, it discussed how the quality supervision station carries out safety supervision on boiler and pressure vessel effectively according to the regulations and standards.It also does discussion on the supervision content incompletely.
    The effect and improvement scheme on unfavorable draining of shaft sealing pipeline
    CHENG Tu1, YU Lifan2
    2018, 40(11):  42-44. 
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    It introduces and analyzes the abnormal conditions and measures taken during pipe warming and operation of shaft sealing system of a unit. The improvement scheme has been calculated and explained, which can be used as a reference for the same type of problems in units.
    Cause analysis and improvement measures of oil system faults in feed water pumps turbine
    SUN Guoqiang
    2018, 40(11):  45-47. 
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    Taking 2×330MW units of a company as an example, the problems that one of the main oil pumps tripped during the operation of feed water pump turbine and another feed water pump turbine tripped during its abnormal joint since the pressure of lubricating oil was low are analyzed. Through theoretical analysis and field test, the reasons for the low joint oil pressure of the oil pump are found out, and the corresponding improvement measures are implemented to improve the safety of the unit operation.
    Test and research of the low voltage ridethrough influence on the converter of coal feeder
    HAN Feng1, YU Cheng2
    2018, 40(11):  48-51. 
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    In order to avoid the power plant tripping due to low voltage disturbance of the power plant which triggers the protection action of the unit, the test of the influence of low voltage on the converter of the coal feeder was carried out according to the specific conditions of the equipment of Zhejiang Energy Lanxi Power Generation Company Limited. It proposed a method of low voltage ridethrough for coal feeder frequency converter of directfiring pulverizing system with middle speed mill.
    Technology and application of a new prefabricated overhead insulation pipe
    GU Jinglei1, ZHONG Shengkai2
    2018, 40(11):  52-54. 
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    It analyzes the disadvantages of traditional overhead insulation pipes that are widely used in heating projects. Accordingly, a new prefabricated overhead insulation pipe and its characteristics are introduced. Compared with traditional overhead insulation pipes, its advantages of short construction period, high cost performance and strong thermal insulation performance are clarified. The actual cases show that within the new prefabricated overhead insulation pipe, the energy consumption of the heating project is significantly reduced, and the environmental protection and economic benefits are remarkable.
    Analysis and precaution on tube bursting in lowtemperature superheater of boiler
    CHEN Xianxian, FANG Jue
    2018, 40(11):  55-56. 
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    There was a tube bursting in the lowtemperature superheater of supercritical unit in a power plant.Through macro inspection, metallographic analysis and electron microscopy, combining previous startup and shutdown inspection status, maintenance status, abnormal operation and the initial design of the boiler, it is discovered that oxidized scale falling off which leads to tube blockage and shortterm overheating is the cause to the tube bursting. Effective preventive measures for operating statuses are proposed, which effectively improve the safety and economy of the units
    Measures to reduce the exhaust loss of gas boiler deaerator
    WU Minjie, TANG Mingfeng
    2018, 40(11):  57-58. 
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    The exhaust loss of deaerator accounts for 87.69% of the total steam loss of gas boiler. In order to improve the economic efficiency of gas boiler in heating operation, measures should be taken to reduce the deaerator exhaust loss. Through analysis, it is confirmed that both excessive and lacking intake water will lead to an increase of deaerator exhaust loss rate. When the load is low, feeding water is heated by admission from the bottom. When the load is high, the feeding water is heated mainly by admission from the top and assisted by admission from the bottom. The measures effectively reduce the exhaust gas loss rate and the gasheat ratio of the gas boiler, and the annual natural gas cost can be saved by about 720000 yuan.
    Safety analysis of boilers taken lownitrogen burner reformation
    CUI Xiuqiang
    2018, 40(11):  59-61. 
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    After lownitrogen burner reformation, the combustion instability of a company occurred in several units. The impacts of the reform on the safety, economy and nitrogen oxide emissions of the boiler were analyzed. Focusing on the five reformed units that have been in loss of ignition,  analyzed from the aspects of boiler check calculation, retrofit installation, cold state acceptance and thermal state adjustment, useful suggestions for the modification and operation optimization for lownitrogen burners are proposed.
    Problems and optimization of heating network circulating pump sets
    ZONG Xudong
    2018, 40(11):  62-64. 
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    The heating network circulating water pump is an important power equipment in the heating system, which directly affects the heating safety and economy. The operation status of each heating network circulating water pump set in every company of Huadian Shandong Company is diagnosed from the driving mode, model selection and configuration.The typical problems such as cavitation erosion, high power consumption rate and large steam throttling loss are pointed out and the optimization plan is put forward.
    Analysis on life management technology of regenerated catalyst in coalfired power plants
    YIN Shun1, LU Zhifei2, YOU Jiyi1, LIU Changdong1, ZHAO Huimin1
    2018, 40(11):  65-67. 
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    The life management of denitration catalyst is an important means to reduce the cost and ensure effect of denitration. Both the regenerated catalyst and the new catalyst have problems in life management and employ different life management techniques. Combined with the characteristics of the deactivated catalyst and the cause of deactivation, the life management technology of the regenerated catalyst and the whole process of its regeneration application are detailed from the design and implementation of the regenerative production process, operation of regenerated catalyst,overhaul and maintenance, etc. It provides reference for the regeneration of the deactivated denitration catalyst and the application of the regenerated catalyst for coalfire power plants.
    Economic analysis of cogeneration system combined cooling,heating,power and steam driven by natural gas
    CHEN Jing1,2,JIANG Ting1,2, XU Jingjing1,2, HU Yongfeng1,2,LI Yue1, LIU Guangyu1,2
    2018, 40(11):  68-71. 
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    The distributed energy system driven by natural gas has the characteristics of being close to users, energy echelon utilization, low carbon, high efficiency, clean and environmental protection. Distributed energy system can provide users with various forms of energy such as cooling in summer , heating in winter, domestic hot water, steam and electricity. Taking a pharmaceutical industrial park as research object, it provides a kind of cogeneration system combined cooling,heating, power and steam. Installed configuration is given through the analysis of load, economic analysis and sensitivity analysis on the cogeneration system. The results show that there is a positive linear relationship between electricity price , steam price and system economy, while static investment , natural gas price have a negative linear correlation with system economy.Establishing a linkage mechanism between the price of cold,hot,electricity and the price of natural gas is conducive to improving the economic efficiency and reducing the operating risk of the project.
    Research and application of cooling storage solution in the natural gas distributed energy station
    WANG Xueqin1,JIANG Ting2,XU Jingjing2,DENG Ya’nan2,HU Yongfeng2
    2018, 40(11):  72-76. 
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    The natural gas distributed energy station has been vigorously promoted and demonstrated in recent year due to its characteristics of clean, high efficiency, safety and environmental protection. The users and load of natural gas distributed energy system are complex and changeable. The energy storage system has a good function of cutting peaks , filling valleys and balancing load. A certain scale of energy storage system can be deployed in the distributed energy station, which can optimize the operation strategy and improve the economics of the system. It takes the cooling supply method of a building type distributed energy station in Shanghai as the research object, and establishes two cold storage schemes which are ice storage scheme and water storage scheme. According to the operation mode and economy analysis, the water storage scheme that adopts waste heat to storage has an 83.2% annual comprehensive utilization rate on average.It is more economical and feasible than the ice storage scheme.
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