Table of Content

25 March 2017, Volume 39 Issue 3

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Study on the backpressure correction curve of 600MW direct air cooling unit and the backpressure of economic operation

ZHANG Xuehai

2017, 39(3):  1-4. 

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To study the 600MW direct air cooling unit backpressure economical operation, backpressure chocking was calculated by adopting equivalent heat drop principle. By adopting the steam turbine power net increment method to calculate the different load is obtained under different environmental temperature, air cooling fan frequency curve and the fitting formula of economic operation, for the economic operation of the same kind of direct air cooling unit to provide the reference.

Heat supply unit watersteam system organic matter behavior study

WANG Guorong

2017, 39(3):  5-8. 

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As the large capacity and high parameter unit into power assistant unit, pure power of large and mediumsized unit under huge pressure, heating to reform is of great significance to improve the economic benefit. After reforming heating due to the increase of filling water, water the influence of organic matter on the unit water vapor quality even more outstanding. Web of processing system from the furnace to the furnace water system to research the behavior of organic matter removal efficiency of organic matter, organic matter in different stages of the study system for water quality as well as to the role of the boiler heating surface corrosion, the influence of the unit for heating water treatment system improvement are proposed.

Principle of contact resistance of alternating current sampling circuit and its simulation analysis

SUN Beijun, XU Liqing, CHEN Xinzhi

2017, 39(3):  9-11. 

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This paper analyzed the resistance characteristics of alternating current sampling circuit of protective control device in intelligent substation and proposed the contact resistance model of alternating current sampling circuit. Firstly, this paper built a simulation model of contact resistance of alternating current sampling circuit using the Matlab Simulink software. Then it analyzed the influence of contact resistance variation on signal transmission and verified it by simulation through adjusting the resistance parameters among terminals. At last, it proposed some reasonable suggestions to preventing the contact defaults of connector.

Large scale coalfired power plant boiler blowing technology and application status

ZHANG Guangcai, WANG Yikun, LIU Honggang, XIE Bing

2017, 39(3):  12-15. 

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In coalfired power plant boiler operation, heating surface deposition and slagging is unavoidable. To ensure the operation safety, this has to be control. This paper introduced and compared steam blowing, hydraulic blowing, gas pulse sootblowing and kinds of sonic soot blowing. Suggestion on application was provided.

Water supply pump steam turbine high backpressure heat supply reconstruction technology study and application

LUAN Jun1, JIANG Jianping1, GAO Peng2

2017, 39(3):  16-18. 

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For the reconstruction of 330MW unit water supply pump steam turbine high backpressure heat supply reconstruction, a series of technical measurements to ensure operation stability and economic efficiency was indicated. This could be referred by similar type of unit for energy saving.

Design of radial gate for spillway of Qincun Reservoir

LIU Guorui

2017, 39(3):  19-20. 

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Based on the feature and function of Qincun Reservoir, radial gate was selected. This paper introduced the structure and design feature of radial gate. In the common oblique branch arm structure, slightly lifting the upper frame will even the load on upper and under frame, and will increase the gate overall rigidity. To eliminated vibration while leakage, steel with less strength was used on gate, and higher strength steel on gate frame. Alignment of hinges was optimized to avoid interference while opening and closing. Fine lubricity and mesh accuracy requires less maintenance.

Discussion on the method of 390H generator rotor demagnetization

WANG Zhongming

2017, 39(3):  21-24. 

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To solve the magnetization problem of journal, sliding ring, fan disk of 390H type rotor journal, sliding ring, fan disk central ring and other parts, the causes were analysed. At the scene of the demagnetization short time limit, the insufficient capacity of ac voltage regulator, steam turbine side guard ring did not pull out the conditions, comprehensive the direct current demagnetization method and ac demagnetization method is adopted to be magnetized parts separately demagnetization, demagnetization effect is good, completely eliminated the generator bearing damage, journal electric burns safe hidden trouble.

Study and application of bowl type medium speed pulverizer overall performance improvement

ZHENG Xifeng, L Zhenzhen

2017, 39(3):  25-27. 

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To solve the problems such as coal bunker frequent jam, air seal leakage and powder pipe blockage, improvement reconstruction of coal bunker, air seal, hot air isolation valve and pulverizer impeller was carried out. The lifetime of vulnerable parts was evaluated. An integrated performance improvement plan for bowl type medium speed pulverizer was established. This could be referred by similar power plant. 

Discussion on “hand in hand” reconstruction of gas turbine power plant service power system

LI Kun

2017, 39(3):  28-30. 

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Gas turbine power plant usually adopted peak load operation mode. To reduce the offgrid power while shutdown, the socall “handinhand” reconstruction to integrate the service power systems between units was carried out. This paper detailed introduced the operation process and the risks existed. This could be referred by similar power plants.

Steam air heater dewater pumps of different size oneoperatingonestandby control problem and solution

LI Xinjian

2017, 39(3):  31-32. 

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This paper introduced the application of steam air heat dewater pump in a power plant. Based on the requirement of autocontrol of steam air heat dewater pumps of different size oneoperatingonestandby, the control method of shared setting value on two manual controllers and two individual PID regulating was indicated. Which fulfilled setting value undisturbed switching and ensured adjusting two pumps of different size. 

Study of the influence of steam temperature of shaft seal on the life of 600MW supercritical steam turbine rotor

ZHANG Gaohui

2017, 39(3):  33-35. 

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In the process of large thermal power unit to participate in grid peak regulating, variation in turbine shaft sealing system parameters causes the rotor at shaft seal to bear alternating stress effect, and finally causes the life loss of rotor. Taking the appearing problems in the commissioning of a certain Huadian power plant as a basis, this paper introduces the influence of steam temperature variation of shaft seal on the life of rotor when current power plant system is in variable load operation. After that, it proposed some corresponding improvement measures in aspects of operation and technical management, which has a certain reference significance for the life management of similar units.

1000MW primary fan increasing vibration cause analysis and solution

CAO Jingfang

2017, 39(3):  36-38. 

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A power plant’s 1000MW unit YKK710-4W type primary fan passed the vibration test after overhaul. In the three months after, vibration kept increasing till over limit vibrating and threatened to unit operation safety. By vibration diagnostic and current spectrum analysis, the primary cause was found as the contact surface of adjusting washer was too small. After changed washer to proper size, this issue was solved.Damage extending and overmaintenance of generator was avoided. This shortened the maintenance period, reduced cost and effectively ensured equipment safety.

Linear optimal transformation of internal leakage treatment and regulation for reheater  attempering water control valves of 1000MW unit

WEI Daojun,WAN Zhirong

2017, 39(3):  39-41. 

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Based on the problem of a power plant’s No.1 and No.2 boiler reheater attemperating water control valve leakage at zero opening, this paper introduced the improvement plant that changed the control valve core to triple seal structure, change the throttle sleeve to triple stage control structure, and change the valve control cure to equal percentage characteristic. After this improvement, the leakage at zero opening was eliminated. Valve flow control linearity is fine. This could be referred by similar control valve improvement project.

Steam turbine primary high pressure adjusting steam stigma valve mechanical jam analysis and emergency measures

GONG Li, SUN Gailing

2017, 39(3):  42-43. 

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Frequent load dip was occurred in Xiangyang Power Plant No.1 Unit. After detailed analysis and test, this was caused by mechanical jam after opening of 80%. To solve this problem, emergency measures were taken and ensured operation. This defect was eliminated after shutdown.

Economy and feasibility analysis of desuperheating water transformation of a superheater

WANG Donghui

2017, 39(3):  44-46. 

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Desuperheating water of superheater is the most important mean for main steam temperature regulating because of its simple structure and rapid temperature regulation. Through transforming the connection method of desuperheating water, this paper analyzed the feasibility and economy of transformation, and proposed reasonable suggestions for the existing problems after transformation.

Improvement practice of circular enclosed coal yard laser inventory counter

CHEN Wei, LIU Yi

2017, 39(3):  47-48. 

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There is blind spot if laser inventory counter was mounted on the stacker boom in circular coal yard. After analysing the cause in site, the laser counter was taken off from stacker boom and mounted onto the reclaimer boom. After this change, the accuracy of counter was increased.

220kV transformer slight gas protection reaction analysis and treatment

NIU Zhifeng

2017, 39(3):  49-50. 

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As the primary protection for oil immersed transformer, gas protection reflected the kind of inside failure. Normally, slight gas reaction to warn, and heavy gas protection to trip. By analysing a slight gas reaction of a 220kV transformer, a false warn caused by moisture absorber blockage was found. This could be referred for oil immersed transformer maintenance.

The design and application of dual power auto switch device

YUAN Siyuan

2017, 39(3):  51-52. 

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A dual power supply auto switch device based on moulded case circuit breaker and AC contactor was designed. The application of this device in Anhui Huadian Suzhou Power Generation Company Limited was indicated. This device is reliable, and easy to install and wiring.

Reason analysis of 380V switch override in desulfurization system and its treatments

TIAN Yuqin

2017, 39(3):  53-54. 

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The incident that a power plant’s 380V desulfurization system busbar incoming switch override tripped multiple times was analysed. The main cause was determined that the load was improperly distributed and improper protection value setting. After redistributed the critical load and adjusted the setting valued, the stability of desulfurization system was increased.

Practical application of blowpipe technology in a tridrum heat recovery boiler of the 9F class 475MW gas turbine

YAN Xi, ZHANG Qingguo, WANG Yongjia, XIAO Guanhua

2017, 39(3):  55-56. 

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This paper analyzed the technical requirements of boiler blowpipe  with energy storage and pressurereducing method, introduced the detailed process of blowpipe with energy storage and pressurereducing method for a tridrum heat recovery boiler of the 9F class 475MW gas turbine in a certain power plant, and presented the control points in blowpipe process. Through  theoretical analysis and practical verification, the blowpipe process performs excellent.

Cause analysis and treatment of the fault of spiral conveyor in BBD3854 pulverizer

SANG Changyong, DU Fuming, GAO Quanhai, LI Xinjian

2017, 39(3):  57-59. 

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This paper analysed the breakage incident of Huadian Weifang Power Generation Company Limited’s BBD3854 type doubleinout pulvervizer spiral conveyor support stick. Two improvement treatments were indicated. During overhaul, spiral conveyor was changed to elasticity selfcompensating structure. The risk was eliminated, system capacity was increased.

Design of locking circuit for preventing misoperation of grounding switch in low voltage side of transformer

SHI Shengyang, LI Shizhao

2017, 39(3):  60-61. 

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To prevent operating crew operate the grounding switch while transformer energized, high voltage display and locking device was adopted. By connecting multiple operating circuits in series with grounding switch, the risk of misoperation was effectively reduced. The safety and stability of electrical system was ensured.

Indication and application of a simplified method to detect silicon dioxide content in desulfurization limestone

PAN Lina

2017, 39(3):  62-67. 

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The limestonegypsum method desulfurization process is widely applied in thermal power plant. The process of limestone acceptance is complicated. Based on GB/T 176—2008Methods for Chemical Analysis of Cement, the reference method requires more than 20 hours. The instead method in GB/T 5762—2012 Methods for Chemical Analysis of Limestone, Quicklime and Hydrated Lime for Building Materials Industry needs more than 10 hours. By innovating test procedure, the simplified method reduced the test duration from three working days to one working day, and reduced the drug consumption. Test deviation is acceptable for site limestone acceptance.

Measures of energy saving and consumption reduction during shutdown of thermal power units

WANG Wei

2017, 39(3):  68-69. 

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To reduce the energy consumption while thermal power unit reserving, the main energy consumption in reserving period was analysed. After set the hydrogen pressure to 0.150MPa and stopped cooling water system, hydrogen dryer, close type pump and oilseal pump, the hydrogen purity and dew point satisfied the requirement and would save 800000 Yuan on energy and maintenance.

Application analysis of circulating bucket technology in flue gas desulfurization absorber tower

WANG Zhijiang1, ZHANG Chun2, ZHOU Zhongqiang3

2017, 39(3):  70-71. 

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In absorber tower slurry area of power plant flue gas limestonegypsum wet method desulfurization system, problems of oxidation air slurry undermixing and gypsum stacking are common. The principle, structure and application of circulating bucket technology was introduced. This technology is effective to solve the problems mentioned above.

Practice of heatpower cogeneration and energy saving and emission reduction

ZHAO Fangming

2017, 39(3):  72-73. 

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Heatpower joint operation is the technological upgrading project that combined heatpower cogeneration, energy saving & energy saving, resources comprehensive utilization, circular economy and other concepts. Based on the policy, cost, profit measurement and analysis of investment revenue, this project has fine profit ability, to improve the production and operation of thermal power enterprises, play a positive role, and provide reference for working on the technical workers.

Floating photovoltaic power generating system

WANG Hongyu, WANG Peiming, LI Yanhong, ZHAO Xiaoguang

2017, 39(3):  74-76. 

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Floating photovoltaic power generation is a new concept that was not widely promoted. This paper compared the merit and demerit of floating photovoltaic power generation system with ground photovoltaic power generation system and curtain wall distributed photovoltaic power generation system. The variety and current situation of floating photovoltaic power generation system was introduced. A few important problems were indicated.