Table of Content

25 October 2017, Volume 39 Issue 10

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660MW secondary reheat ∏ type boiler start up commissioning technology study

WANG Lin, HE Jiwang, YANG Bo, GAO Jinghui, ZHAO Zhidan, WANG Hongyu, MENG Yingqi

2017, 39(10):  1-5. 

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Secondary reheat technology was widely applied due to high economic efficiency. This is not any application of secondary reheat unit in our country yet. Base one the first 660MWclass ultrasupercritical secondary reheat boiler, the unit boiler features were introduced. Key technologies of secondary reheat boiler were discussed from cold state ventilation test, low load stable combustion, preliminary burning adjustment and other aspects. Solutions for the problems of combustor, fan and control logic were provided. After commissioning and improvement, unit operation is stable and reliable. All parameters meet the generation requirements.

Gaussian mixture modelbased steam turbine shaft failure

LUO Chanchun1, LI Dezhong2, YANG Liu2, HU Rong2, REN Zilong2, XIE Xiaopeng2, XIANG Chunbo2

2017, 39(10):  6-9. 

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Based on  K means clustering algorithms and Gaussian mixture model, and a power plant’s 320MW unit historical operation data, Gaussian mixture model of steam turbine shaft was built. By analyzing the similarity of realtime operation and expectation value from model, combined with steam turbine shaft failure database, ultimately realized steam turbine shaft failure diagnostic.

Superheater oxide dissolution metal material local corrosion mechanism study

DENG Yuqiang, YE Zhi, ZHANG Xiaoping, ZHANG Shaoyong, CAI Guobao, ZHANG Jiguang, TU Wei

2017, 39(10):  10-13. 

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In the cut pipe inspection and simulated cleaning test after engineering cleaning，it was found that the local oxide skin peeling part appeared a corrosion pit of more than 400 microns. The reasons for the formation of corrosion pit are analyzed. Analysis results show that the regional and local scale dissolved metal oxide skin peeling bare area, will form the “large cathode” and“small anode” battery corrosion effect, accelerated the corrosion of metals, the partial oxidation of skin peeling parts generated serious corrosion pit. Therefore, it is necessary to evaluate the corrosion control effect with the actual pipe sample when the chemical cleaning of the oxide skin of superheater is carried out simultaneously.

Heat network heater inlet flow regime numerical simulation study

LI Na

2017, 39(10):  10-13. 

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Heat network heater is the core equipment of power plant heat supply system. The steam inlet flow regime is critical for the safety of heat network heat. Based on an operating heat network heater, the accident of heat exchange tube exploration was analyzed. Different improvement proposal was indicated. Based on 1︰1 physical model and k-ε turbulence model, inlet flow regime numerical simulation was carried out under different pressure and flow rate by adopting computational fluid dynamics (CFD). The inlet flow rate distribution of different types of heat network heater was analyzed. Different improvement proposals were compared. Study result indicated that inlet flow regime influenced operational stability in certain level. Reformation of inlet type could effectively improve inlet regime and even flow rate distribution. Adding concentric reducer optimally effect flow regime.

Distribution network automation safety protection development and realization

QIN Kai, GAO Zhiyong

2017, 39(10):  14-16. 

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With the development of power distribution network, most network that does not have fiber optic communication adopted public network, such as General Packet Radio Service (GPRS), which increased the risk that attacked through public network. Safety protection plan published by State Grid in 2011 and 2017 was introduced and realized on Guodian Nanjing Automation Company Limited power distribution terminal, and then passed by the test of China Electric Power Research Institute.

1000MW unit boiler soot blowing steam resource reconstruction

QIN Xichao

2017, 39(10):  23-24. 

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To improve the safety and economic efficiency of boiler soot blowing system, steam resource shall be properly selected. After compared three steam resource plans, mixed resource from high pressure cylinder exhaust and low temperature reheater inlet was selected. After reconstruction, boiler heat consumption rate and generation coal consumption decreased. Working condition of soot blowing control valve was improved. Unit safety was enhanced.

Spectral vanishing viscosity method combined with spectral element method for convectiondiffusion equation

SHI Yongxing

2017, 39(10):  25-29. 

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The Chebyshev spectral element method combined with spectral vanishing viscosity method is used to solve the onedimensional convectiondiffusion equation, aiming at the instability phenomenon of spectral element method for convectiondiffusion equation with high Reynolds number. The stability of the method is deduced with character analysis, and the feasibility of the proposed scheme is verified by a numerical example. The influence of spectral vanishing viscosity parameters on stability and accuracy is discussed. It is demonstrated that the stability and accuracy at high Reynolds number of spectral vanishing viscosity method are obviously improved compared with that of spectal element method. Larger spectal vanishing viscosity term is beneficial for extending the stable region and smaller viscosity term is beneficial for improving the accuracy at the condition of stable computation. The size of the viscosity term could be appropriately set to guarantee the stability and obtain numerical solution with high accuracy.

Inferiorlignitefired 600MW supercritical circulating fluidized bed boiler bunker bay arrangement design improvement

KONG Ming, ZHOU Zhengyi, LUO Zizhan

2017, 39(10):  30-31. 

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Based on a circulating fluidized bed boiler which burning inferior lignite, to increase reliability, uniformity and controllability of boiler coal feeding, the arrangement of coal bunker bay was improved. The alignment of to embed bunker bay beside boiler was introduced. This arrangement take remarkable advantage on technical and economic aspect.

1000MW unit net coal consumption counter balance calculation influence factor analysis

ZHANG Yan

2017, 39(10):  32-34. 

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In the production statement system of a power plant’s 1000MW ultrasupercritical unit, the counter balance net coal consumption value fluctuation is bigger than positive balance net coal consumption. Which did not satisfy the requirement of difference of positive balance and counter balance net coal consumption shall be less than 2%. To find the causes, heat balance was applied to evaluate unit performance. Factors that could influence counter balance net coal consumption were quantitively analyzed. The measurement tolerance, unknown leakage quantity, water supply pump seal leakage quantity and other factors were indicated. Realtime heat rate formula and accuracy of counter balance calculation was improved.

Thermal power plant circular coal storage erection technology

ZENG Xinming, CHEN Yaxiu, HUANG Peibing

2017, 39(10):  35-37. 

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In power plant construction, the erection of circular coal storage is critical for the whole project if the steel trestle span, erection height and weight over a certain scale. Erection plan, including lifting plan, steel trestle segment, erection site arrangement, lifting steel rope calculation and sectional lifting plan, was introduced. Matters about sectional lifting needs attention was pointed out.

Zhanjiang Tiaoshun Power Plant circulating water pump optimization analysis

ZHENG Hongfa

2017, 39(10):  38-40. 

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Based on Zhanjiang Tiaoshun Power Plant 2×600MW, common failure of circulating water pump was introduced. Failure cause was analyzed. Treatment was provided accordingly. After treatment, safety, reliability of circulating water pump was increased. Economic benefits was obtained.

Thermal power plant belt conveyor foundation load general algorithm

LENG Yikang

2017, 39(10):  41-43. 

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The calculation of belt conveyor foundation load is critical in coal handling system design. The accuracy of foundation load, provided by coal handling system engineer, is related to the cost of conveyor trestle, unloading ditch, transfer station and other facilities. Existing algorism is too simple, and lack of feasible or reliable theoretical prove. By consulting literature and engineering data, belt conveyor foundation load algorithm was discussed. Which could be referred for foundation load calculation.

SA738Gr.B steel welding cold crack sensitivity analysis

LUO Zhenxin1, DING Lianzheng2

2017, 39(10):  44-45. 

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Oblique Ygroove cracking test and implant test was carried out on SA738Gr.B steel plate. Welding cold crack sensitivity of this material was analyzed.  The result indicated that nuclear power steel SA738Gr.B, according to ASME II, has fine cold cracking resistance. 

Cause analysis and treatments of face cracks for concrete face rockfill dam of Elesai Downstream Hydropower Station in Cambodia

HUANG Chengbin

2017, 39(10):  46-48. 

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In the first phase construction process of concrete face rockfill dam of Elesai Downstream Hydropower Station in Cambodia, intensive cracks appeared on the face after the concrete pouring. According to the situation analysis, the main cause of cracks on face is the differential settlement of dam and the reverse water pressure inside the dam intensified the development of cracks and deformations. This paper introduced the treatments of the cracks and its effect, and summarized the experience and lessons in the construction process of concrete face.

Supercritical boiler tail flue gas duct vibration cause analysis and treatment

LI Youxin

2017, 39(10):  49-51. 

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A power plant’s supercritical II1 type boiler was vibrating after maintenance. After analysis, calculation and test, vibration source was indicated from low temperature overheater. Vibration was found resonance due to Karman vortex shedding frequency is close to the acoustics standing wave frequency of duct. By adding antivibration separate plate at low temperature overheater area, vibration was eliminated.

Partial high oil circulation ratio cased control oil quality degradation analysis

WANG Dawei

2017, 39(10):  52-53. 

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There was an incident that a gas power generation company control oil turned black, electrical resistivity and acid value over standard and other degradation phenomenon, and affected operational safety and stability of control oil system component. After excluding overheat, inner inspection of control oil tank was carried. Partial circulating ratio abnormal high is the main reason caused oil quality degradation. The improvement of providing tank baffle was introduced.

Low load working condition electric pump operation method improvement

LIU Xiaoxin

2017, 39(10):  54-55. 

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Based on the problem of high power consumption of a heat and power plant’s 330MW sub critical unit electric pump, load test was carried out. Single unit operation is able to satisfy 65% or under load working condition. Power consumption reduction is significant while sliding pressure operation.

 

1000MW unit highspeed mixed bed resin leakage accident analysis

PAN Lina, WANG Jinglong

2017, 39(10):  56-57. 

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The problem of a thermal power plant’s 1000MW unit prefilter abnormal pressure differential, highspeed mixed bed resin leakage and resin catcher leakage comprehensive analyzed. The main causes were indicated as large quantity of water soluble paper was imported into system by mistake, ignoration of reheater cleanup procedure and resin catcher seal washer aging. Treatment measures were indicated accordingly.

17CrNiMo6 pulverizer reducer gear shaft breakage cause analysis

WANG Xi

2017, 39(10):  58-59. 

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17CrNiMo6 is normal steel for bearings. There was an accident that a thermal power plant’s pulverizer reducer gear shaft, made from 17CrNiMo6, was broken. After macroscopic analysis, chemical element analysis metallographic structure analysis and mechanical property test, it was found that mechanical properties are not evenly distributed on the shaft outside surface carburized layer. Partial area is lower than standard required value. Breakage appears like impact fatigue caused. This equipment worked in high load condition for long period. Impact in startup caused crack and expended to shaft core, ultimately caused shaft broken.

Large scale hydro power plant one button blackstart plan and system test

TIAN Xiaobing

2017, 39(10):  60-62. 

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The onebutton blackstart plan of Goupitan Power Plant was introduced. This system is able to remote recover the service power system. At the same time, problems of equipment reconstruction and site test was analyzed. This plan is a rapid and effective blackstart method that not relying on manually start diesel generator. This method and specific test has certain operability for unattended operating power plant.

Retrofit of high voltage variable frequency speed regulating device for induced draft fan motor of 600MW unit

HUANG Haibo

2017, 39(10):  63-65. 

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Four units of induced draft fans of Hunan Huadian Changsha Power Generation Company’s two units of 600MW are open cycle type. Due to operation environment of large humidity deviation and high dust content, power unit failed frequently. After reformation of combination of ID fan and booster fan, capacity of ID was increased from 4000kW to 6000kW. Existing 4500kV·A high voltage variable frequency device would not satisfy the requirement. To reduce the investment, the operation mode of redundant parallel was indicated. Power supply system capacity was increased. After reformation, fractional energy savings achieved 30% to 50%. At the same time, power consumption cost and operational cost was significantly reduced.

Lignite boiler waste heat integrated gradient utilization system application and study

ZHAO Xiaonan1, YANG Jusheng2

2017, 39(10):  66-68. 

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Lignite boiler preheater exhaust temperature above 161℃ is not energy efficient. Based on the energy grade gradient utilization principle and methodology of systems integration, system of tail flue gas waste heat integrated gradient utilization was designed and applied. Compared with traditional arrangement, the advantage of gradient utilization technology is significant.

Application of Sound PLAN on thermal power plant noise prediction analysis

QIU Gang

2017, 39(10):  69-71. 

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Clients in China and foreign countries are having more and more strict requirement on noise control. Accurate estimation of denoise work amount in bidding stage is critical. Bidder shall simulate noise distribution, and analyze noise source. And then make the denoise plan. Based on client’s requirement, denoise plan was made based on Sound PLAN software.

660MW thermal power plant energy saving improvement control strategy

ZENG Lilan

2017, 39(10):  72-73. 

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To reduce steam turbine control valve throttle loss, steam distribution method was improved according to control valve flow characteristic test. After improvement, unit primary frequency modulation and automation generation control (AGC) responsiveness was weakened. To improve unit primary frequency modulation and AGC responsiveness, a technology that bring condensate water into primary frequency modulation and AGC was introduced. Unit capability of capacity variation was enhanced, and reduced control valve throttle loss. Energy saving operation was realized.

Guodian Hanchuan Power Generation Company Limited desulfurization waste water evaporative crystallization project process analysis

WAN Yonggang1, XU Feng2, TIAN Xufeng3, ZHAO Lixin3, WANG Xin3

2017, 39(10):  74-76. 

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Power plant desulfurization waste water contents large quantity of salt and water quality fluctuate greatly, which requires very thoughtful design. After applied mechanical vapor recompression (MVR) evaporative crystallization technology, desulfurization waste water zero emission was achieved. MVR evaporative crystallization system was detailed introduced, which could be referred for application of evaporative crystallization process.