Integrated Intelligent Energy

Nuclear power plant wash cleaning guide radar liquid level meter parameter improvement

ZHANG Shu,HUANG Laiming,QIU Fengxiang

2016, 38(8): 1-2.

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Abstract:A nuclear power plant applied VEGAPULS 62 guide radar liquid level meter on hot water heating system to precisely measure surge tank liquid level. To prevent demineralized water run over surge tank, and supply valve over frequently act while wash clean, the liquid level meter parameter was improved. After improvement, liquid level in surge tank remains normal, liquid level meter work properly.

Influence factors and reducing measures of water requirement ratio of coal ash

ZHANG Xue1,CHEN Shiguo2,WANG Qunying2,JIA Lutao2,LI Yonghui2

2016, 38(8): 3-7.

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Abstract:The water requirement ratio is an important indicator for the coal ash quality evaluation of coalfired power unit. In order to improve the coal ash quality and its economic benefits of power plant, this paper analyzed the influence factors of coal ash water requirement ratio based on the waterreducing effect mechanism of coal ash, including the fineness, loss on ignition and particle shape, etc.,and introduced the current technologies and methods of reducing coal ash water requirement ratio in China and abroad.

GIS bellow expansion joint structure improvement

ZHANG Jing1,ZHANG Zhongwen2,CHU Honghe1,LI Na1,SUN Chao1

2016, 38(8): 8-11.

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Abstract:Bellow expansion joint structure was improved and compared with original structure under finite element analysis. The result indicated that stress and axial deformation of improved structure was significantly reduced, deformation difference of expansion joint center and margin was reduced, bending moment on bolt was reduced. After improvement, equipment could resist exterior force more effectively, and bear stronger deflection. Thus, bellow expansion structure improvement could effectively resist exterior force, reduce deflection, and ultimately ensure the operating safety and stability of GIS.

Online fitting method of performance curve of combined cooling,heating and power unit

LIU Jie, WANG Hengtao, LI Yiqiang, CHEN Yaobin

2016, 38(8): 12-15.

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Abstract:In order to evaluate the operation performance of combined cooling, heating and power unit and perform a realtime optimization, this paper proposed a piecewise fitting method of operation data using genetic algorithm. The genetic algorithm adopted the existing ga function in MATLAB, and utilized the least square method to evaluate the fitting error and constraints to ensure the continuity and smoothness at piecewise points.Using this method, this paper fitted the relationship among high pressure steam quantity, low pressure steam quantity and generating capacity of gas turbine for the heat recovery boiler of a certain distributed energy station in Shanghai. Fitting results indicated that this method could realize the automatic piecewise fitting and the fitting curve could accurately reflect the trend of data.

Research and application of new type anti condensation system for high voltage switch cabinet

LI Chuanjiang

2016, 38(8): 16-18.

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Abstract:Based on the principle of condensation formation, the reason that switch cabinets condensate and the shortage of existing anti condensation measures, this paper put forward a new type anti condensation system for high voltage switch cabinet and describes structure principle, application and control algorithm of this system, which solved the problem of high humidity and easy condensing of high voltage switch cabinet effectively.

Intelligent substation secondary circuit operating maintenance system design and implement

WANG Dongxia, JI Ling, TAN Tingfang, WANG Tao

2016, 38(8): 19-24.

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Abstract:To improve secondary system design, allocating, operating maintenance and control integration level, enhance intelligent substation secondary system operating maintenance efficiency, intelligent substation secondary operating maintenance technology was studied, virtual secondary circuit operating maintenance system was designed and implemented. Intelligent substation secondary virtual circuit design, allocation, automatic integrating allocation, version control, alteration control, alteration analysis, virtual secondary circuit monitoring, failure positioning and virtualized presentation was realized. Virtual secondary circuit operating and maintenance efficiency and control was effectively improved.

A new detection method of de excitation circuit jumper

GU Jianrong

2016, 38(8): 25-27.

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Abstract:This paper introduced a new detection method for deexcitation circuit jumper function test using rotor reverse voltage, which could be simulated from the negative half cycle of power rectifier bridge output voltage according to the inductance characteristics of generator rotor. Field application indicated that this method could ensure the reliability of related deexcitation circuit and reduce the deexcitation accidents of power unit due to faults of deexcitation circuit to the most extent.

Power plant diesel power generator start anomaly treatment

NIU Zhifeng

2016, 38(8): 28-29.

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Abstract:Power plants usually equipped diesel power generator as emergency backup power source. Once plant power supply deenergized, diesel power generator will quickly start and take the load to secure the main equipment. Diesel power generator start anomaly causes were analyzed. The cause of preheat system failure caused start anomaly was indicated. Reference for diesel power generator operating and maintenance was provided. 

1000 MW unit start backup power tapping plan selection

ZHANG Yanlin，LIU Zhengqiang，WANG Peng

2016, 38(8): 30-31.

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Abstract:This paper took Jiaozuo Danhe Power Plant extension project as example, combined with site location, position in grid and outside start/backup power tapping condition, four tapping plans were indicated. By technical and economic comparison, the best plan was confirmed. 

Production process of prefabricated cabin for GRC secondary equipment

GU Jinshu1,ZHENG Jiasong2,YUAN Difei1,YU Chunlin1,BAO Anqun1

2016, 38(8): 32-34.

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Abstract:Prefabricated cabin for secondary equipment is a core product in intelligent substation generalized by the State Grid, which can substitute protection chamber and reduce the occupied area of substation and shorten the construction period. Based on the practical engineering experience, this paper introduced the GRC and cabin specification and listed the production method and technological process, which gives a good effect on promoting GRC secondary equipment.

Wind power tower P&H prestress high strength anchor bolt fracture analysis

LEI Qinghua1,WANG Jianwen2,WANG Zheng2

2016, 38(8): 34-36.

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Abstract:Anchor bolts for a wind power plant’s P&H prestress pile foundation were fractured after installation. Units were forced to stop, foundation need repair or rebuilt, and caused enormous economic losses. Macroscopic and microcosmic analysis were made, and confirmed that the fracture was caused by insufficient material toughness. Due to inner defect and impurities, stress concentrated partially, and caused crack extended, finally fracture. Material selection standard was discussed, advises were provided for similar projects. 

Analysis of fieldbus debugging for coal fired power plant

CUI Chaochao1, ZHANG Ying2, SHEN Dongsheng2, CUI Yiqun1

2016, 38(8): 37-39.

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Abstract:According to the implementation process of fieldbus system project of coalfired power plant, this paper analyzed the effects of operation processes on fieldbus debugging, such as design, configuration, leavefactory check and acceptance, bus construction and monomer debugging, etc., pointed out the problems that caused by technique or incomplete organization management in the processes, and proposed the corresponding countermeasures.

Overcurrent malfunction analysis of AC oil pump electric motor for TC2F steam turbine

YANG Zhangang

2016, 38(8): 40-41.

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Abstract:This paper introduces the structure and principle of steam turbine oil system and AC oil pump of coal to gas relocation project at Tianjin Chentang Thermal Power Company Limited, and put forward precautionary measures and main control point for routine maintenance based on the process of the oil system, pump structure and the analysis of overcurrent reason of AC oil pump electric motor for No.3 steam turbine, and to make sure to avoiding the occurrence of accident and increasing stability and reliability of the unit.

Discussion and practice on mixed burning low ash fusion coal in 300MW unit boiler

ZHANG Bo, ZHANG Weibin, SONG Xiuke

2016, 38(8): 42-43.

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Abstract:This paper conducted a feasibility experiment on mixed burning lowashfusion coal in 300MW unit boiler and studied each important monitored parameter and boiler agglomerating under different load conditions, maximal oxygen uptake and type of air distribution. The result shows that the surface of boiler tend to coke after mixed burning lowashfusion coal. However, through adjustment of type of air distribution, coking phenomenon was decreasing, which increased the effectiveness of boiler.

400V PT primary fuse fusing cause and treatment

BU Fanwei

2016, 38(8): 45-47.

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Abstract:The incident of 400VPT primary fuse fusing was analyzed, and confirmed that the main cause is that the exciting current increase. To provide currentsensitive resistant on neutral point solved the problem of PT primary fuse fusing when single phase grounded.

Application of copious cooling low pressure economizer in new 660MW ultracritical unit

ZHOU Renmi, LUO Haihua

2016, 38(8): 48-50.

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Abstract:Economizer is usually used to lower boiler emission temperature. Aim to the emission temperature of new unit was normal, economizer could use gas and steam afterheat, lower coal consumption and lower desulfurization system intake temperature, lower desulfurization system water consumption, and then increase unit economic efficiency. 

Analysis of characteristics and application for control strategy of thermal stress of 660MW unit

PENG Bowei

2016, 38(8): 51-53.

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Abstract:A certain power plant has been running two 660MW units. Its digital electric hydraulic control system has been transfer thermal stress and rate limitation of load change to logical program, which make sure the control of equipment thermal stress. This paper combined the theory of thermal stress control and control strategy and analyzed application characteristic to make sure equipment has functioned for the maximum effect within the service life and the safety and stability of the units.

Application of infrared imagery temperature measurement on preventive maintenance in 630MW unit

LI Hu, LI Jian

2016, 38(8): 54-55.

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Abstract:This paper mainly introduces the basic principles of infrared thermal camera and the infrared thermal camera management methods and applications at a 630MW super critical turbine unit in Huadian Anhui Suzhou Electricity Generating Company Limited. By analyzing one case of some equipment abnormal heating to illustrate the importance of the infrared thermal camera in daily maintenance. Infrared thermal camera's applications greatly improved the turbine unit management and the reliability of electrical equipment and the thermal control equipment after maintenance.

Danger points analysis and their preventive measures of modifying protection setting value without power outage for the line of 500kV transformer substation

JIANG Yuan, LI Ting, LI Lu, XIE Peng, LIU Jun, MIN Tiejun

2016, 38(8): 56-58.

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Abstract:It is easy to cause the maloperation or refusaloperation of relay protection device and result in a serious accident of power grid while modifying protection setting value without power outage.In order to control safety risk, simplify workflow, improve work efficiency and ensure the safety operation of power grid, this paper conducted a detailed danger points analysis in the work of modifying protection setting value without power outage for the line of 500kV transformer substation and proposed some preventive measures, such as unifying workflow, making investigation plan of parasitic circuit, adopting cut area operation of setting value and optimizing allocation management, etc.

330MW boiler water wall breakage analysis and preventive measures

LIU Yongjun

2016, 38(8): 59-60.

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Abstract:Water wall is the main evaporating heating surface of boiler. Once boiler stopped by water wall breakage, power generating and heat supply will be directly affected. Thus to have knowledge of water wall breakage causes and preventive measures is essential. Water wall breakage was analyzed. Preventive measures were provided.

Economic analysis of a power plant’s draining system improvement

FU Yiwei, YU Xinying, JIAO Hao

2016, 38(8): 61-62.

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Abstract:A power plant’s drain system was blocked while low load operation. After analyzing operating data and equipment installation, which was known, in low load condition, low pressure difference is not able to overcome the resistance of equipment and level difference. The authors indicated the improvement measurements that to provide additional draining pump. The authors also provided and compared two improvement plan.

Waterturbine efficiency calculation fining method analysis

LU Jun1，WANG Jianghuai2，LI Wei1，ZHANG Tianxia2，LU Peng1，WU Jinhui2，GAO Ning1

2016, 38(8): 63-65.

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Abstract:Existing waterturbine efficiency calculation methods and their problem were introduced. The process of to realize realtime online analyzing waterturbine efficiency was discussed. Waterturbine efficiency calculation formula, input data collection method, input data effectiveness estimation, result tolerance analysis and other problem were emphasized. Calculation instantaneity and effectiveness were achieved. A new approach to exam waterturbine efficiency was indicated.

Power plant environmental protection data collection center implement based on EDPFNT+

LIANG Weiping, JIA Yan, ZHANG Chaofeng

2016, 38(8): 66-68.

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Abstract:To strictly follow the national environmental protection policies and standards, thermal power plants are adding desulfurization and denitrification system, and implement SOx, NOx,dust and other pollutant monitoring. The environmental protection data integrated display system, developed based on EDPFNT+,was introduced. Function and Implement process was discussed. By using this system, environmental protection data from each central control room could be integrated onto one computer. Data storage and real time display was also provided for monitoring and inspection.

The measures of decreasing units ammonia consumption

WANG Lei, FAN Yan

2016, 38(8): 69-70.

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Abstract:In 2013, Huadian Inner Mongolia Energy Baotou Company Limited has conducted denitration technology reform on 2 units and acquired environmental protection benefit, but the consumption of liquid ammonia is always slightly high. After equipment optimization, method improvement and management strengthening, the consumption of liquid ammonia is lower than before, which archives environmental protection, energy conservation and safty.

Certain energy conservation transformation of S109FA combined cycle and two platoon plan operating unit

GUO Weikang

2016, 38(8): 71-74.

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Abstract:This paper gives optimization on performance of the heater logic, temperature matching function and hazardous gas protection for S109FA combined cycle and twoplatoon plan operating unit, and transformation on cooling water for circulating water pump motor and closed cycle cooling water. Through analyzing the data before and after transformation, it approved a certain technical transformation satisfied the safety requirements and optimized working condition of the unit, which brought economic benefit and social benefit.

Case study of selective catalytic reduction for denitrification system of a certain power plant

HUO Xiaohua1, HU Zhijian2, REN Cuitao3

2016, 38(8): 75-76.

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Abstract:Take SCR reheat heating type in 200MW ultrahigh pressure steam turbine generator unit as an example, and combined with the problem of unsatisfied of denitration efficiency, unstable ammonia escapement ratio and blocking air preheater, this paper analyzed that the reason is because denitrification system was running away from the design value for a long time and several air preheater was blocking. In the end, this paper put forward countermeasures for above problems and set up the lowest temperature of safe operation to make sure flue gas is homogeneous distribution at the catalyst inlet of the reactor during actual operation. This proposal provides a security, high efficiency and stability guidance for SCR denitrification system.

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