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Table of Content

    25 December 2017, Volume 39 Issue 12
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    Side coal bunker opposed firing boiler primary airpowder balance test study
    Lv Hongbiao, SHI Henghui
    2017, 39(12):  1-3. 
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    It is common that coal powder distribution unbalance of each combustor outlet of side coal bunker boiler. Combustors that closer to extension end have higher coal powder flow rate and higher air velocity. Combustors that closer to fixed end have lower coal powder flow rate and lower air velocity. This is the main cause of uneven combustion and primary air tube blockage. A new type of air velocity adjustment device was introduced. After installed between each distributor and combustor, airpowder velocity of each branch tube was effectively online balanced. The problem of boiler uneven combustion was solved.
    The configuration and layout analysis of large thermal power plant feedwater pump set
    Yv Liping
    2017, 39(12):  4-7. 
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    The different choice of configuration, driving device, control method and the layout of large thermal power plant feedwater pump sets, would form the different influence to the auxiliary power, auxiliary power consumption. This article through the comparing technical and economic of feedwater pump set configuration scheme, both domestic and overseas as well as the actual work, analysis and put forward that a single 100% capacity turbinedriven feedwater pump for daily running configuration, coaxial ectopic layout of small steam turbine using double output shaft to drive feedwater pump and booster pump, is the more reasonable configuration and the layout of feedwater pump set.
    Heavy load pulley highcycle fatigue and lifespan analysis
    HAN Ganghua
    2017, 39(12):  8-10. 
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    For belt conveyor heavy duty pulley, body welding fatigue damage is the most common failure. The application of highcycle fatigue method on heavy duty pulley fatigue analysis was introduced, and discussed based on engineering practice. Which could be refer for designing.
    Silo top stacking equipment unloading ditch sealing type study
    CHENG Wenguang
    2017, 39(12):  11-13. 
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    With the increasing of number of silos in electric power, coal, coal chemical, port and steel industry, the requirement of seal of top stacking equipment became more and more strict. It is very important to study on unloading ditch sealing technology, and to satisfy environmental requirements. After analyzing and comparing with traditional sealing method, it was indicated that the sealing method studied is more feasible.
    Applicationof realtime simulation in a new type governor
    YANG Bingliang
    2017, 39(12):  14-18. 
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    Based on the reconstruction of four units of China Huadian Corporation Fujian Branch’s Mianhuatan hydro power plant governors, a method of rapid and stable adjust mode and coordination control strategy was introduced. Based on waterturbine generator nonlinear model, a new type governor combined variable parameter power adjustment and variable parameter power feedforward control was introduced and proved by application. This study solved the problem that existing governor key component mostly relying on import.
    Reason analysis and treatment of the distortion of the deaerator level measurement
    CHANG Yingli1, CHANG Yali2, BIAN Heying1, ZHAO Shuiping2
    2017, 39(12):  19-20. 
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    A power plant has discovered the vaporization in the waterfeeding pump when the deaerator showed normal reading on deaerator level measurement. Focused on the discovery, the researcher found out the existence of distortion on the deaerator level measurement. Discussion and theoretical analysis was carried out to find out the solution to the problem, and to provide reference to the accuracy on the level measurement of the deaerator of similar types.
    Economic analysis under different control mode of M701F4 gas turbine unit
    CHEN Zhao
    2017, 39(12):  21-26. 
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    In order to make the M701F4 gassteam combined cycle power generation unit in high load operation achieve maximum economic benefits, the unit stable operation under different control mode, the electric consumption, such as auxiliary power data statistics, analysis, combined with the primary frequency control modulation requirements and testing, the temperature control and temperature control mode of the comprehensive economic benefits of quantitative comparison, draw speed control (close to the temperature control) model of the optimal operation mode, can provide a reference for the choice of the same type unit operation mode.
    Power distribution network feeder failure simulation system study and implementation
    LI Junda
    2017, 39(12):  24-26. 
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    To ensure failure will be fixed correctly after distribution network automation system put into service, the function of feeder automation shall be tested. Traditional test has multiple problem and drawbacks. This study provided a softwarebased distribution network failure simulation system.Which could be used for distribution network automation system feeder automation test.
    Threedimensional power plant and its application during the maintenance period
    CHEN Xiaohong, MENG Yingchao
    2017, 39(12):  27-29. 
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    Based on digital design and data achievement, the digital power plant is using KKS coding system and extendible database design, based on the intercommunication between the production management system and the information management system, to implement the information sharing and integration. Through exploration and indepth analysis of the accumulated data and making good use of the information, the level of the digital optimization, digital management，and policy support will be greatly enhanced. The 3D visualization management on overhaul and operation maintenance, and the improvement in the level of collaboration in each link will enable the enhancement of safety, reliability, and the economy of the power plant and promote the energy saving, emission reduction, green environmental protection.
    Application of fluoroplastics heat exchanger in thermal power plant
    FAN Peng1, LI You1, XIE Jie2
    2017, 39(12):  30-34. 
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    This paper introduced a new type fluoroplastics zeroleakage gas gas heater (MGGH) to solve the problem of white smoke and gypsum rain. The feature of fluoroplastics heat exchanger, process component, working principle, design parameter, operation performance was detailed introduced. After put into operation, heat exchange performance, air and flue gas system resistance, low load auxiliary steam consumption and system air leakage achieved or precede design expectation. This system is safe and reliable, and solved the problem of white smoke and gypsum rain.
    Analysis and trouble shooting of the gas control PM4 instruction deviation of  #1 generator unit
    SHI Xiaowei, JIANG Minjie
    2017, 39(12):  35-36. 
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    During the operation of S109FA gassteam combined cycle generator unit ,it occurred that the feedback indicating the actual valve position of the gas control PM4 deviates from its instruction, threatening the safe operation of the unit. In this paper, we studied the the cause of this fault and the solution was found.
    Benchmarking and optimal operation of 600MW thermal power plant
    JU Wenfei, WANG Jinnan
    2017, 39(12):  37-39. 
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    In this paper, the comparative study was carried out between two 600MW thermal power plant (A and B) with similar power units and load factor but significantly different operation economics. The annual generation capacity of plant B is 97.6% of plant A, but it has created 143.9% of the annual profit in comparison to plant A. Major economic indicators of plant A and B were normalized using benchmarking, and their influences on the coal assumption are calculated for comparative study. The research revealed that as integrated power plant, plant A has a higher power consumption rate，bigger condenser difference，and higher exhaust temperature, which results in its poor performance in its operation economics. 5.343g/(kW·h) of coal consumption of power supply was affected by the three factors above, which occupies 84.3% of the total. According to the actual unit setup, technological modification measures are suggested.
    Study on secondary leakage caused by superheater explosion
    LUO Chuanxu, WU Zhangqin, AI Chuan, SUN Chenggang
    2017, 39(12):  40-41. 
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    Thermal power plant boilers heatabsorbing tube sometimes may explode due to long overtemperature or shortterm overheating in the daily operation. This paper analyzes the case that after the analysis and solution of the explosion of the heatabsorbing tube, other place which had been affected by the proexplosion had been damaged by a sudden secondleakage. By means of macro analysis, material analysis, metallographic analysis and other methods, the weld organization where the leakage was caused and the nearby tube samples were analyzed. The reason for the second leakage is due to the large burst stress at the fillet weld at the upper header after the first burst, and the secondary leakage from the fillet weld zone occurred after the start of boiler. Therefore, after the treatment of bursting tube, a nondestructive testing should be made on relevant metal parts comprehensively to eliminate hidden dangers.
    Design of prevent seepage on Huilong Pumpedstorage Hydropower Plant
    YANG Yang
    2017, 39(12):  42-43. 
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    Huilong Pumpedstorage Hydropower Plant take the combination of concrete slabs and shotcrete layer with net as reservoir’s fullclosed seepage control measures。After the severe leakage of reservoirs, polyvinyl chloride (PVC) coating+mortar protection scheme should be adopted. After years of operation, with the serious aging of PVC waterproof layer, seepage control effect decline gradually.  Tests demonstrate that with high strength cement mortar as understructure, spraying singlecomponent polyurea control is a successful measure.
    Heat network heater safety operation treatment
    WANG Yuchuan1, YANG Zhifeng2
    2017, 39(12):  44-45. 
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    Heat network heaters usually operate under different working condition from design condition. This could significantly shorten life span of heaters. Equipment damage causes were analyzed. The treatment of increasing circulating water quantity and inlet temperature was indicated to made heater steam pressure closer to design value. Operational safety of heat network heater was ensured.
    Technical and economic analysis of “zero emission” treatment of  high salinity wastewater from coalfired power plants
    JIN Yinjia1, SUN Haifeng1, WANG Fengji1, YAN Min1, SHI Xiaolei1, ZHU Yue1, LIN Jingmin2
    2017, 39(12):  46-49. 
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    In a power station，wastewater dealt with the cascade utilization and enrichment， produces 50m3/h, high salinity waste water. Terminal wastewater, which come from deep concentrated high salinity waste water, will evaporate , crystallize and finally achieve zero emissions of wastewater. There is introductions about concentration technologies such as the disctube reverse osmosis, electrodialysis, positive osmosis, decumbent membrane steaming, and mechanical vapor compression (MVC), and evaporation crystallization process such as multiple effect distillation (MED), mechanical vapor recompression (MVR) and mechanical vapor compression (MVC). It provides the basis for choosing ideal treatment process to achieve the zero emission of high salinity waste water from coalfired power plant.
    Calculation method of pollutant emission based on calorific value ratio of coalfired flue gas
    ZHANG Jinzhu, CHEN Qizhao, JI Jinfang, LIANG Xinlei
    2017, 39(12):  50-52. 
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    In the working process of the thermal power industry, it is often necessary to estimate the volume of flue gas and the pollutants absorb and emit by equipment, but it is difficult to estimate without reliable data of the coal. It presents the calculation formula of the pollutant emissions based on calorific value ratio of coalfired flue gas. Comparing with the provided standard formula and estimation formula, the calculation method is convenient, fast and calculation error is smaller.
    Influence of the dosage of excitant on the strength and curing Pb2+ properties of the material based on CFBC ash geopolymer
    CAO Wangjun1, CHEN Yuzhao2, CHEN Shiguo3
    2017, 39(12):  53-55. 
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    The utilization of a large amount of deposited coal ash from circulating fluidized bed, which is the CFBC ash geopolymer by using CFBC ash as raw material. The study is carried out for the effects of alkaline excitation agent on the strength of the geopolymer, and the curing properties of Pb2+ with inductively coupled plasma method. Research results show that when the excitant of n(Na2O)/n(SiO2) is 0.27, the CFBC ash geopolymer's intensity reaches maximum, when n(Na2O)/n(SiO2) is higher than 0.27, the intensity is almost constant, the solidify of Pb2+ with CFBC ash geopolymer grows with the increase of the amount of excitant.
    The prevention of the ash blocking in air preheater of the denitration system of 1000MW unit
    LI Shaogang，HAN Lina
    2017, 39(12):  56-58. 
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    Huadian Laizhou Power Generation Company Limitied a phase of the selective catalytic reduction (SCR) denitration device parameter is rising air preheater plugging ash.Which results in the increase in the electrical assumption of the fan, and the pressure difference between the preheater gas outlet and the primary and secondary air outlet. This would cause the decrease in the economy of the unit and unit output. In this paper, the cause of ash blocking has been analyzed, and the precautionary measures are presented to improve the economy or the unit.
    The effect of H2O on the combustion characteristics in syngas flame
    LI Jianliang
    2017, 39(12):  59-61. 
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    A numerical study has been conducted to investigate the effects of H2O on flame propagation speeds and ignition delay times in syngas flame by Chemkin with GRIMech 3.0.The results show that the property especially chemical property of H2O has a significant influence on the combustion characteristics. When H2 concentration is low, the chemical property of H2O increases flame propagation speeds and ignition delay times; When H2 concentration is high, the chemical property of H2O decreases flame propagation speeds and increases ignition delay times.
    Discussion of mist eliminator renovation in 2×660MW thermal power units
    LI Zhigang1，LIU Honglei2，LI Xutong3
    2017, 39(12):  62-64. 
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    Taking a FGD (fluegas desulfurization) technical reform in a thermal power plant as an example, the transformation scheme of the differentiator in the original absorber was adopted, and the equipment layout was carried out according to the simulation results of the mist eliminator. After the completion of the transformation, the emission quality of net flue gas droplets is less than 20mg/m3, which fully meets the requirements of the country’s ultralow emission standards.
    Pressure difference control measures for air preheater of ultralow emission thermal power unit
    WANG Bin
    2017, 39(12):  65-66. 
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    The problem of air preheater clogging is becoming more and more prominent after the implementation of ultralow emission transformation of thermal power units. With analysis of a sets for ultralow emissions after transforming influence on differential pressure of the air preheater, through the denitration system performance optimization test and air preheater performance test, the ammonia injection quantity adjustment, such as blowing optimization, puts forward the comprehensive control of air preheater cold end temperature not overrun, reasonable puttinginservice proactively air preheater blowing and other measures. In the case of the ultralow emission standard of the unit, the operating pressure difference of air preheater is stable, and there is no abnormal blockage of air preheater, and the power consumption of the fan is greatly reduced.
    Impact analysis of equipment attenuation rate to the PV power generating equipment availability hour
    XIAO Liming
    2017, 39(12):  67-69. 
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    Generating equipment availability hours is the core performance indicator for the operation diagnosis of a power plant. It is subjected to the impact of many variables. Besides the natural conditions and the curtailment of PVbased power generation, equipment performance and O&M also impacts the power plant availability hours. PV power generation industry needs to address such impact through its own improvements. This paper provides followup review on a specific PV power plant. The impact of battery attenuation rate to its availability hours is measured: namely attenuation rate up by 1%, availability hours down by 12 hours. This poses new demands for technology innovation on both the PV equipment manufacturers and the integrated development between upstream and downstream PV power plants.
    Exploration on key points and process of environmental protection management of gas distributed energy station
    LIU Feng
    2017, 39(12):  70-72. 
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    In recent years, with vigorously advocating the effective use of clean energy and promoting the concept of green development by the state, the scale and number of gas distributed energy station has been developing steadily because of its advantages such as clean and green, short construction period, low initial investment and small occupied area. Most of the gas distributed energy stations are located in the environmental sensitive area around the city or industrial park. Once the environmental pollution problem occurs, the impact on the surrounding environment and residents will be great Therefore, enough attention should be paid to the environmental problems of gas distributed energy stations.We must understand and grasp the main points and key links of the environmental protection management of gas distributed energy stations, and take various effective measures to ensure that no environmental pollution incidents occur.
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