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Table of Content

    25 March 2018, Volume 40 Issue 3
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    Distribution of load optimization of gas distributed energy system based on genetic algorithm
    LIU Yubin1, QUE Yawei2, WU Zhenghua2, KONG Fei1, SUN Siyu1, WANG Hengtao1, LIU Jie1, LU Yongqing2, LIU Qingyang2
    2018, 40(3):  1-4. 
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    In order to improve the efficiency of gas distributed energy system operation, a load optimal allocation model based on genetic algorithm is proposed. By establishing the accurate model of the unit characteristic curve and the intelligent load distribution model, the load of each unit is allocated reasonably and the profit of the distributed energy station is maximized. Using the optimal load distribution model, a distributing energy station on a Shanghai campus is optimized. The optimization results show that the model can greatly improve the comprehensive efficiency of generating units and integrated gross margin of the power station.
    Research on QoS model based on SOA of power application system
    CHEN Xiaohong, MENG Yingchao
    2018, 40(3):  5-8. 
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    According to service need of electric power information, PoSOA is developed as a onestop integrated information service system based on serviceoriented architecture (SOA).Inevitably, there are varied services with similar functions and service indicators (response time, available time, cost, etc.), since they are from different provides. This makes services selection and replacement difficult. Driven by the requirements of PoSOA, it presents a QoS property description model that helps to customize the description set of QoS properties with relevant problem domain for different applications, and provide better supports to service selection and exception handling in serviceoriented applications. The model has been applied in power application system.
    Study on IP control valve of largescale steam turbine engaged in heat supply regulation
    LIU Xiaoyan, WANG Wenzhong, OUYANG Jie, WEI Dongliang, XIE Lingui
    2018, 40(3):  9-12. 
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    As to reheating turbine, high temperature reheat steam flow reheated in boiler goes through the IP and controlling valve before entering the IP cylinder, which secures the safety of the unit by controlling the intake. Normally, the IP control valve is not involved in load adjustment. But when there is a requirement for IP valve controlling from a unit, IP control valve should be able to adjust the reheating steam pressure as well as the steam flow for the purpose of engaging in heat supply regulation. According to the application example, the feasibility of IP control valve to regulate the heat supply is studied from the reheat steam parameters, the valve flow characteristics, the valve operation mode and the influence of the flow velocity design on the steam force. The results show that the technique of IP control valve’s engagement in heat supply regulations is feasible and has good effectiveness.
    Feasibility study of alteration for pressure control valve inner structure in supercritical units
    JIANG Jianwei
    2018, 40(3):  13-16. 
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    Considering the harsh conditions, frequent faults and the high maintenance fee of the pressure control valve, a reform to the inner structure of pressure control valve was taken. It simulates flow field and stress of valve with ANSYS12.0, proves that the reform is stable and reliable.Success in implementing the valve in localization application of 600MW supercritical units is achieved.
    Online monitoring technology and case analysis of large power transformer oil chromatography
    KANG Zhenhua
    2018, 40(3):  17-20. 
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    As the voltage level and capacity of the power transformer is rising, its operation safety and reliability is of increasingly importance. At present, many power plants have installed oil chromatogram online monitoring device on the transformers. Through the daily monitoring and data analysis, the hidden trouble existing in the equipment can be effectively found. It mainly introduces the source of chromatographic fault gas and introduces the method of fault diagnosis. It also analyzes two cases of oil chromatographic anomalies which provides reference for operation and maintenance personnel.
    Analysis and treatment of the cause of a 335MW unit’s tire burning during startup process
    QIU Huahai, LI Feng, JING Bao
    2018, 40(3):  21-23. 
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    After the overhaul of  #4 unit of a power plant, there has been 2 tile burning accidents on power generation exciter’s  #7 bearing bush in the startup process. According to analyze, abnormal temperature rise is not only related to large bearing load. The insufficient bearing load, poor contact between axle and bearing bush, the shake of bearing bush caused by large clearance which leads to no enough force to fasten, and dry grinding between bearing bush and axel caused by lacking oil film, can also lead to damage of bearing bush. Using the exclusion analysis method, it is concluded that the building oil film through increasing load is the key to solve the problem on  #7 bearing bush.
    Transformation and benefit analysis of plasma ignition device
    FENG Peifeng1, WANG Lin2，LIU Xiaosha3
    2018, 40(3):  24-26. 
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    In order to improve the support on the plasma ignition device from the coal pulverizing system, to solve the problem of the severe vibration of the coal mill under the condition below minimum output, a technological transformation plan of the frequency conversion of the coal mill is put forward. Frequency converter is installed onto the motor at the bottom of boiler’s coal mill. When the boiler starts, it remains the minimum coal feed volume of the coal mill unchanged. Decreasing the speed of the disc can reduce the output of coal pulverizing and meeting the requirements of the plasma ignition device. As the amount of coal is not reduced, the thickness of the coal layer on the grinding disc is guaranteed, and the coal mill would not vibrate obviously. The field practice results show that the matching degree of the coal pulverizing system and the plasma ignition system is significantly improved after the transformation, so does the running smoothness of plasma ignition device and operation of coal mill. Environmental benefits and economic benefits are good.
    Application of stacked spiral dewatering filter in a large power plant
    YUE Yujin，LI Yan，LIU Zili
    2018, 40(3):  27-29. 
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    It introduces the working principle of centrifugal dewatering machine, plateframe dewatering machine and stacked spiral dewatering filter by comparing their technical and economic indexes. It choose the stacked spiral dewatering filter as sludge dewatering equipment for a power plant’s purification station since its low cost, low energy consumption, and high dewatering efficiency. The low moisture content of mud cake and high sludge recycling rate can effectively reduce the sewage discharge of power plant.
    Development and application of supervision and management of plant auxiliary power in thermal power plant
    WU Xin1, WAN Zuming1, WU Ning2, YU Lei2, LIANG Huixian3
    2018, 40(3):  30-32. 
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    In order to control the private energy usage of coalfired power plant precisely, reduce business operating costs, the thermal power takes detailed management by fusing the analysis on the electric energy acquisition technology, information technology and energy saving theory. The practical application shows by analyzing the rationality of the main auxiliary engine usage, energy efficiency of the motor can be promoted and the operating cost of the thermal power plant can be reduced.
    Construction and application of a new model for the whole process of fuel in thermal power enterprise
    CUI Xiuqiang，QIAO Long
    2018, 40(3):  33-35. 
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    The new model of whole process fuel technology diagnosis is based on the whole process online monitoring and diagnosis platform of fuel. In combination with fuel management concept and advanced technology experience, the online fuel technology diagnosis standard and index system is established. It depends on remote online analysis, by means of threelevel accurate treatment and basing on comprehensive analysis and comparison, which make a success on the whole process fuel online “Diagnosis and Treatment”. Using the monitoring platform to detect problems in time, in combination with expert onsite diagnosis, it would provide technical support for solving the problem of fuel management.
    Application of analytical techniques of vibration material level to ball mill
    WANG Xiaojie
    2018, 40(3):  36-38. 
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    In order to poach the potential of energy saving in pulverizing system, optimize operation mode, improve its output，reduce the unit consumption, and keep longterm safe economic operation under best working condition，it takes telemetry vibration analysis technique. The technique takes mill material level, entrance pressure, and exit temperature as control objects to comprehensively adjust coal feeder, hot air actuator and cold air actuator. Through parameter optimization and coordination control, it finally integrate the pulverizing system’s grinding, conveying and drying capacity regulating into a complete set of control system, which realizes the automatic control for coal pulverizing system.
    Analysis and preventive measures for the ash collapse and fire extinguishing of the 600MW Wshaped flame boiler
    DAI Jingyi1, DAI Bin2, MA Kecong2
    2018, 40(3):  39-41. 
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    The ash collapse and fire extinguishing of the boiler will bring great loss to the thermal power plant. Mastering the operating condition of the boiler is very important to prevent flue ash from collapsing andeliminate the fire hazard. The analysis is made according to the accidentally fire extinguishing of HG1900Wflame boiler during operation. It takes operational control and technical transformation as preventive measures, which improves the stability of unit operation significantly.
    Comparative analysis of the influence of structural shape andabrasion of a coal mill lineron the coal mill output
    SANG Changyong,DU Fuming
    2018, 40(3):  42-44. 
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    Tracking and analyzing 2 sets ofliners with different structures which are applied on 3B and 3C coal mill of #3 boiler in Weifang Power Generation Company Limited for 3 years, the causes of insufficient coal mill output are found and the corresponding measures are put forward. Utilizing the overhaul, maintenance and QC activity,liner transformation is implemented. By comparison, the MVL liner of Magotteaux Company can improve the output of the coal mill and ensure the safe and economical operation of the coal mill.
    Development and preliminary application of fan selection software in electric power industry
    ZHANG Dawei
    2018, 40(3):  45-47. 
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    Designers in the fan selection process，lack software tools which can comprehensively process practical data. The workload is heavy, which may lead to errors and inconsistent results comparing with final documents. This software can analyze and calculate the parameters of fans’ test data, operation data and equipment type and help designers to conduct the fan selection process, to improve the unity and professionalism of the work and reduce the labor intensity. According to the optimization and model selection by this software on a 410t/h pulverized coal boiler’s powder evacuation machine, 114 thousand yuan can be saved per year. It proves a reference.
    Analysis and prevention of the large expansion difference of ultrasupercritical steam turbine in hot startup process
    ZHANG Liangjie
    2018, 40(3):  48-49. 
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    Through the analysis and treatment of the abnormal vibration during a ultrasupercritical steam turbine startup process, it makes an deduction and calculation of the special relationship between the temperature of the shaft seal and the variation of expansion difference. And it is confirmed that mismatching of temperature of the shaft seal is fundamental reason to large expansion difference. It puts forwards accurate prevention measures and can provide reference for the risk control of units’ startup.
    Research on the inspection and improving method of direct current resistance of electrical wire and cable conductor
    JIN Kunpeng, LU Chenjie, QIAN Xiying
    2018, 40(3):  50-52. 
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    The inspection on DC resistance of electrical wire and cable is one of key projects of state grid material inspections. The resistance seriously affects the safety and efficiency of power supply. It summarizes the influence, brought by sample preparation process, bending degree, testing environment, clamps design and contact resistance, on the DC resistance value of electrical wire and cable in inspection. And it makes analysis on the further improvement of inspection accuracy.
    Fault and treatment of highvoltage motor rotor’s iron core
    FAN Mengxiang
    2018, 40(3):  53-54. 
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    Motor is a device that converts electrical energy into kinetic energy. There are many forms and structures of electric motors, but all of them are composed of stators and rotors. It analyzes the routine inspection on bulging fault and fault itself of the high voltage motor rotor in details, and puts forward the countermeasures to tackle the fault.
    Calculation analysis and application of special tool for generator stator hoisting
    JIANG Yuehui, ZHANG Qian
    2018, 40(3):  55-56. 
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    A set of special tool for hoisting generator stator is introduced. It can be used with the Loxic hydraulic lifting device to lift stator, and shift the stator into place with the help of power plant bridge machine. The special tool has the advantages of simple combination, convenient installation and high structural rigidity. ANSYS Workbench software is used for the finite element analysis of each beam in the special tool. The maximum stress of each beam should be less than that of the material allowable stress and the intensity should meet the request for utilization. The application can be promoted in practical engineering project.
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    LAN Bin
    2018, 40(3):  57-58. 
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    In view of the great fluctuation and lagging reaction of the primary air quantity measurement at the inlet of the coal pulverizers of 2 doublestage 1000MW units of the secondphase Shanxi Qingshui Chuanneng Company Limited, modification of air volume measuring device was carried out. The new type of antiplugging array air measuring device can help the operators make better judge to the boiler air distribution which ensure the safety and stability of unit operation.
    Economic analysis of different water supply modes of M701F4 gas turbine rotor cooling system
    HE Xugao
    2018, 40(3):  62-65. 
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    Taking experimental contrasting method，it compares two different TCA cooling water pump allocation scheme of M701F4 gas turbine which are supplying water with separated TCA cooling water pump or from outlet of high pressure feed pump. The advantages and disadvantages of 2 schemes are analyzed from economy and security under two common working conditionsstarting procedure and normal operation.
    Research on carbon emission data management of thermal power enterprises
    SHAO Yuan
    2018, 40(3):  62-65. 
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    Through the analysis of the key parameters affecting carbon emission and quota, it proposes data management which can reduce carbon emission and increase the quota. After analyzing the key parameters that affect the carbon intensity, it is concluded that reducing the coal consumption or increasing the heating ratio can fundamentally reduce the carbon emission intensity.
    Consideration and analysis about carbon asset development in thermal power enterprise
    ZHAO Guotao1, DING Quan1,NIE Bing2
    2018, 40(3):  66-69. 
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    Responding to global climate change and controlling greenhouse gas emissions, thermal power enterprises are facing increasing pressure to reduce emissions. It is necessary to strengthen the awareness of innovation and to focus on developing the potential of carbon assets from a new perspective. Applications of carbon emission trading, CCER(China certified emission reduction) and PHCER can bring more economic benefits and social benefits to the enterprises and are good supplements and promotions for conducting the new energy business. CCS(carbon capture and storage) technology can reduce the greenhouse gas emissions directly from the production phrase and its future application prospects is optimistic. Carbon finance is the product of the combination with greenhouse gas emission and capital market, who will get greater development in the future. Carbon asset development management system is the combination and innovation of lowcarbon concept and information technology and is also one of the important steps in energy internet construction. Thermal power enterprises have greater potential in the development of carbon assets so it is needed to formulate and implement a plan as soon as possible.
    Discussion on characteristics of rooftop photovoltaic project and project construction
    HAN Qi, WANG Chao, ZHANG Xiaoqi
    2018, 40(3):  70-73. 
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    It explains the current situation of photovoltaic power generation in China, summarizes the main problems of ordinary photovoltaic power projects and the development bottleneck. It concludes that rooftop photovoltaic power generation has prominent advantages and would be one development direction of the photovoltaic industry. Analyzing existing problems in the process of constructing rooftop photovoltaic project, it formulates the key points of direction control and requirements of management in the process of engineering construction. A number of measures to promote rooftop photovoltaic project construction are in sustainable development.
    Application of fivestage biological process in the upgrading of urban wastewater plant
    WANG Zhengping, MENG Lu, ZHENG Yijiang
    2018, 40(3):  74-76. 
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    The designed capacity of second phase project of a wastewater treatment plant in Tianjin is 4.5×104m3/d. A2O process for denitrification and desulfurization is adopted in the biological treatment process. The effluent quality meet the primary standard grade A of 〖WTBX〗Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant 〖WTBZ〗(GB 18918—2002).The upgrading and reconstruction project improves the effluent quality to meet the Tianjin local primary standard,〖WTBX〗Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant 〖WTBZ〗(DB 12/599—2015).As the capacity remains unchanged，the original A2O tank was modified to AAOAO process (fivestage biological process). Furthermore, carbon source addingand bioselectors devices were installed into the biological process. After reconstruction, denitrification and desulfurization were significantly promoted, and the effluent quality meet the discharge standard steadily. The fivestage biological process has great popularization and application value in upgrading and reconstruction of urban wastewater treatment plant due to its advantages of no additional land occupation, short reconstruction period, low investment cost and stable effluent quality.
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