2018-01-05StudyoncharacteristicsofuniformityoptimizationonpulverizedcoalflowinaW-flameboiler

WUYue(China Datang Corporation Science and Technology Research Institute Northwest Branch, Xi’an 710065, China)

Abstract: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 NOxreduced 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 NOxgeneration and improves the combustion condition of the furnace (especially in the middle of the furnace).

Keywords:W-flame; boiler; baffle plate; powder distributor; primary air pipe; uniformity on pulverized coal flow; economizer; reheater

2018-01-10Calculationoficethicknessofoverheadtransmissionlines

LIGuiming(Hunan Electric Power Construction Supervision & Consultancy Corporation Limited, Changsha 410002，China)

Abstract: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 ±800 kV 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.

Keywords:overhead lines; wire; ice thickness; wire sag

2018-01-13ApplicationsandcharacteristicsofBS-Ipitottube

LIUGuanqing1,CAOWenguang1,ZHANGGaoshan2，HUALiang3，SHIZhansheng1,MAZhian1,ZOUChongen1(1.China Huadian Science and Technology Institute, Beijing 100070, China；2. China Huadian Corporation Hunan Branch，Changsha 410004，China；3. Hunan Huadian Changsha Power Generation Company Limited，Changsha 410203，China)

Abstract: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. In-situ 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.

Keywords:BS-I pitot tube；particle-laden flow；CFD；velocity coefficient；relative attitude；deposit ash

2018-01-16Anti-corrosionoptimizationofreinforcedconcretesingletubechimneyinwetdesulfurizationcondition

JIAJungang1，CHAIJun1，WANGRichao2，WANGJinxing3，ZHAOJingzhong4，LIUFei4(1.China Energy Engineering Group Shanxi Electric Power Engineering Company Limited，Taiyuan 030001，China；2.Shanxi Guojin Coal Power Company Limited，Taiyuan 030001，China；3.Taiyuan OM Chimney Material Company Limited，Taiyuan 030001，China；4. China Energy Engineering Group Shanxi Electric Power Construction Third Company Limited，Taiyuan 030001，China)

Abstract:Since the coal-fired 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 anti-corrosion optimizing measures for chimney structure are proposed after numerous researches were taken on domestic coal-fired 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 anti-corrosion insulation, lining with belt tongue-and-groove hydrophobic acid-proof brick, closing to the building form of isolation layer. The 210 m 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 3-years operation.

Keywords:wet desulfurization；single tube reinforced concrete chimney stack； seepage prevention and anti-corrosion；optimization；seepage

2018-01-19Analysisontransformationofelectricallydrivenfeedpumpin150MWheatingunitinWudaHeatingandPowerPlant

GUOYafeng1,LIUChunsong2,WANGDongchuan1(1.Inner Mongolia Huadian Wuda Heating and Power Plant Company Limited, Wuhai 016040, China; 2.Guodian Nanjing Automation Company Limited, Nanjing 210032,China)

Abstract: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 on-site 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.

Keywords:Wuda Heating and Power Plant; heating unit; feed water pump system; auxiliary pump; conversion of frequency conversion; scoop pipe regulation; energy saving

2018-01-22Analysisandtreatmentofthetrippingcauseofa1000MWunitboilerairpreheater

HANLina,LIShaogang(Huadian Laizhou Power Generation Company Limited, Laizhou 261400, China)

Abstract:Based on the example of Huadian Laizhou Power Generation Company Limited’s 2×1 000 MW coal-fired 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.

Keywords:1 000 MW unit; air preheater; trip; runback(RB); frequency converter

2018-01-27IEC-61850-basedlocalizedprotectionintelligentmanagementunitinteroperateproblemanalysisandtreatment

QIANWei,RUIGuojun,LUOZhaojun,LIUWenbiao(Guodian Nanjing Automation Company Limited, Nanjing 210003, China)

Abstract: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.

Keywords:localized protection device; intelligent management unit; IEC 61850; modeling of string-type data; interoperation of settings

2018-01-30Comprehensivemanagementmethodaboutarcfaultinpowersystemsoflargethermalpowerplant

WANGJue(China Huadian Engineering Corporation Limited, Beijng 100160, China)

Abstract:To reduce the damage caused by the arc fault occurred in the 6 kV auxiliary power system of large thermal power plant，it should adopt a kind of comprehensive management method including improving the high-voltage 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.

Keywords:6 kV auxiliary power system; bus protection; high voltage transformer; arc protection device

2018-01-346FAgeneratorprimaryrotorgroundingprotectionactiontreatment

YULifan1,CHENGTu2(1.Hangzhou Huadian Xiasha Power and Heat Company Limited, Hangzhou 310018, China; 2.Jiangsu Huadian Qishuyan Power Generation Company Limited, Changzhou 213011, China)

Abstract: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.

Keywords:generator; excitation system; rotating excitation; grounding protection; analyze and treat

2018-01-36Causeanalysisandtreatmentforjammingofdouble-stagemovingbladeadjustableaxialflowfan

ZHANGShaoxing(Huadian Weifang Power Generation Company Limited, Weifang 261204，China)

Abstract:After denitration ultra-low emissions renovation in Huadian Weifang Power Generation Company Limited, unit#3，#4 double-stage 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.

Keywords:double-stage moving blade adjustable axial flow fan；blade；jamming；seal

2018-01-39Analysisofcommonproblemsinthermalreliabilityassessment

WENGJiang(Fujian Huadian Electric and Engineering Company Limited,Fuzhou 350013, China)

Abstract:On the basis ofDetailedrulesforreliabilityevaluationofthermalcontrolsystemofthermalpowerunitinHuadianGroupCorporation(trial) and DL/T 261—2012Theguidelinesforthethermalpowerplantautomationsystemreliabilityevaluationtechnology，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 inde-pendent 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.

Keywords:thermal control; reliability; the rectification; unplanned shutdown

2018-01-42Initialinvestigationofon-linetestoftransformerpressurereliefvalve

ZHUDa(Hangzhou Huadian Xiasha Co-generation Company Limited，Hangzhou 310018，China)

Abstract:In the operation of transformer pressure relief valve, there is a certain hidden trouble. There is no in-situ 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.

Keywords:transformer；pressure relief valve；online test

2018-01-44Pneumaticcontrolvalveselection

YANGChunming(Huadian Environmental Protection Engineering and Technology Company Limited, Nanjing 211153, China)

Abstract: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.

Keywords:control valve; selection; safety; flow characteristic

2018-01-46Analysisonanabnormalvoltagesagof400Vmotor

YEPengzhen1，SUXing1，ZHANGGuangyun2(1.Wanneng Tongling Power Generation Company Limited, Tongling 244012，China；2.State Nuclear Power Engineering Company Limited，Shanghai 200233，China)

Abstract:Focusing on a tripping event of a 400 V 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 400 V devices is proposed.

Keywords:voltage sag; trip; control power; fault type; probability

2018-01-50Glassfiberreinforcedplasticsexhauststackqualitycontrolfactorsandmanufacturecontrolkeypoints

LIUHuiping,SUQi,LIPeng,ZHANGYang,SUHui(Beijing Datang Hengtong Mechanical Conveying Technology Company Limited, Beijing 100097, China)

Abstract:With the widespread of glass fiber reinforced plastics exhaust stack in newly built coal-fired 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.

Keywords:glass fiber reinforced plastics exhaust stack; resin matrix; reinforced fibers; process design; quality control

2018-01-53Constructiontechnologyandapplicationofautomatichydraulicroofliftinhighstacktitaniumsteeltube

LIFulin(Huaneng Qinbei Power Generation Company Limited,Jiyuan 454650，China)

Abstract: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.

Keywords:ultra-high schimneys；titanium steel inner tube；automatic hydraulic jacking system；construction；stress

2018-01-55Examplesoftreatmentsonweldingcracksinsidethethick-wall12Cr1MoVsteelpipe

LIUXinying1，LIUJinqiu1，XIAXiaotao1，LIGen1，HAOGuangting2(1.Shandong Branch of China Electric Power Research Institute，Jinan 250062，China；2.Huadian Zhangqiu Power Generation Company Limited, Jinan 250200，China)

Abstract:12Cr1MoV is the most commonly used low-alloy heat-resistant 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 300 MW units with the largest number in service.

Keywords:12Cr1MoV steel；cracks；welding；heat treatment；supervision and inspection

2018-01-57Largescalecoalsteelplatesilodesignandsafetyprotection

PENGLiyuan,JIANGChuanfei(Shandong Huajian Warehousing Equipment Company Limited, Liaocheng 252000, China)

Abstract: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.

Keywords:large scale silo; safety surveillance; clean up device; inert gas protection; spray system

2018-01-59Analysisofultra-lowemissiontransformationofa1000MWcoal-firedunit

PANJianqiang1，YOULiangzhou2(1.Huadian Jiangsu Energy Company Limited Jurong Power Plant, Jurong 212400, China; 2.Huadian Electric Power Research Institute，Hangzhou 310030，China)

Abstract:Taking an ultra-low emission transformation project of 2×1 000 MW coal-fired 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 ultra-low emission.

Keywords:1 000 MW unit; coal-fired units; pollutants; desulfurization; denitration; ultra-low emissions

2018-01-62Selectionanddesignoftemporarychimneyplacedonthetopofdesulfurizationtower

XIAHuaipeng,WANGYang,ZHAOBing(China Huadian Engineering Corporation Limited, Beijing 100160, China)

Abstract: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 cross-section can be selected and reasonable structural measures are taken to address the vulnerable points, which can achieve design optimization.

Keywords:desulfurization tower; temporary chimney; finite element analysis; stress; deformation

2018-01-65Analysisofregionaldistributedenergygasturbineunitselection

SHAOXufeng(Jiangsu Huadian Qishuyan Power Generation Company Limited, Changzhou 213011, China)

Abstract: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.

Keywords:gas turbine; distributed energy; selection of units; comparison of selection

2018-01-68Studyonheatingreformofsteamturbineunit

SUNJiquan1,XUTao2,SHANGYongqiang2(1.Xinzhou Guangyu Coal Power Company Limited, Xinzhou 034000，China；2.Huadian Zhengzhou Mechanical Design Institute Company Limited, Zhengzhou 450046，China)

Abstract:In response to national policies energy conservation and emissions reduction, to meet the demand of civil heating supply modification，2×135 MW steam turbine were taken into heat-and-power 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 DN1 200 mm steam supply line, at the same time extract 5 t/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 9.4 kt of standard coal every year, which reduce the consumption of coal and smoke in the region.

Keywords:thermal power generation；heat supply modification；back pressure steam turbine

2018-01-71Retrofittingoffluepipemisteliminatorof330MWthermalpowerunit

XINGHao,ZHENGXifeng(Huadian Luohe Power Generation Company Limited, Luohe 462300, China)

Abstract:With constant improvement of the national environmental protection requirements and increasingly strict air pollutants emission standards on coal-fired 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 330 MW thermal power unit, the quality concentration of the droplet at the outlet of desulfurization device fluctuates greatly.The retrofitting scheme of two-stage 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 30 mg/m3.

Keywords:thermal power unit; desulfurization system; purifying flue; mist eliminator; soot; emissions

2018-01-73Technologicalandeconomicanalysisaboutultra-lowemissionofdustfroma200MWcoal-firedunit

ZHUWentao,WANGJianfeng,HUDa,LIUQiang(China Huadian Electric Research Institute, Hangzhou 310030, China)

Abstract:Taking a dust emission reduction transformation of 2×200 MW coal-fired 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, 5 mg/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.

Keywords:coal-fired unit; ultra-low emission; wet ESP; efficient desulfurization dust removal technology; technological and economic