Integrated Intelligent Energy

Standardization study on optimal combination scheme of gland seal type selection for steam turbine set

NI Ding;SHEN Guoping

2011, 33(1): 1-4.

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Due to diversification of technical development of steam turbine seal, when a power plant try reform its steam turbine for energy conservation, it is faced with a question: how to select various seals. According to the characteristics of the radial motion of turbine shaft under various conditions, the variation laws of seal safety gap and economical gap of steam turbine in two conditions were analyzed, and the classifying method of various gland seal was proposed, which provides more scientific and rational reference standard and basic principle for steam turbine seal reformation in power plants.

Realization of turbine governing valve calibration using Ovation system in operator workstation

GUO Bochun;XIAO Sheng

2011, 33(1): 5-8.

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In the Ovation DCS, using the graphic language configuration, the calibration of the turbine governing valve servo system was realized in operator workstation. The method of the governing valve calibration and the matters needing attention were expounded. The method may be used as reference for the enterprises of the power generation, the steel smelting and the chemical industry, in which the Ovation system was used.

Research on protection system of ultrasupercritical steam turbine

AN Xiaomin

2011, 33(1): 9-13.

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The equipment control strategy of protection system of ultrasupercritical steam turbine was expounded. The signal processing and operation principle of each protection circuit were introduced. According to several times tripping of the steam turbine, the problems existed in the system were analyzed, the improving scheme was put forward to raise the unit economical efficiency.
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Reformation of drainage pipeline of axial exhaust fan in 600MW steam turbine

ZHANG Xuehai;MEI Sen

2011, 33(1): 14-15.

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Aiming at the problem of obstructed drainage existed in axial exhaust fans No.1 and No.2 of 2×600MW unit in Huaneng Tongchuan Power Plant, two reformation schemes of axial exhaust fan drainage pipeline were analyzed. It was considered that connecting the drainage pipe in bottom of impellers stage I and stage II of axial exhaust fan directly into the inlet pipe can solve the problem of obstructed drainage. In Huaneng Tongchuan Power Plant, using the standby unattended time, the drainage pipes of axial exhaust fans No.1 and No.2 were reformed. After the reformation, the problem of obstructed drainage of axial exhaust fan was solved thoroughly, and desired result was obtained.

Reformation and debugging of highpressure intercept device of steam turbine

WU Xiangtao;LIU Jianrong;HE Hui

2011, 33(1): 16-17.

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In the periodical flexibility test of highpressure intercept device of 335MW steam turbine in Huadian International Zouxian Power Plant, some potential hazards of shutdown accident occurred, which include the fault of pressure transducer, the jam of electromagnetic valve, the human error and others. The highpressure intercept electromagnetic valve was redesigned, and an isolating device was added. In the flexibility test, the online safe oil system is completely isolated. Then the shutdown risk caused by hardware fault or improper operation can be avoided. 

Analysis on reason of jamming of steam turbine sliding key system and treatment

ZENG Jianbin

2011, 33(1): 18-20.

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The jamming of sliding key system of steam turbine generator set was occurred in a thermal power plant, which caused the differential expansion of the unit to be exceeded the standard badly in start up and shut down process, and endangered the unit equipments and the operation safety. The jamming part of the key seat of sliding key system had been repaired, and the key had been replaced; so the jamming of the sliding key system was eliminated basically.

Analysis on network framework of Mark VI control system for gas turbine

MAO Huajun

2011, 33(1): 21-26.

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The basic working principle of Mark VI turbine control system used in gassteam combined cycle generator unit was introduced. The applications of Ethernet, VLAN, the time synchronization and other technologies in the control system were analyzed. The related experiences were summarized.

Calculation method of alignment for shaft system of turbogenerator set

CUI Chuantao

2011, 33(1): 27-30.

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The alignment of shaft system is very important in unit overhaul; it is important factor influencing on safe and economical operation of the unit. The purpose of alignment for shaft system of turbogenerator set was introduced. The concrete method of alignment for shaft system was expounded. The feasibility of the method was verified by practical example. By using this method, the work load of alignment in unit overhaul was reduced, and favorable result was obtained.

Research of two units and single circulating water tower operation technology in winter

ZHAO Xiaokun;YANG Zhongbiao

2011, 33(1): 31-32.

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The water circulating pump of the 2×300MW unit of China Huadian Baotou Donghua Heat and Power Corporation Limited is driven by 50Hz power supply and is difficult to adjust the circulating water flow. In winter, the circulating water flow is smaller, and the serious icing occurs in the water tower, which causes that the pipe of the condenser is blocked, the terminal temperature difference and the subcooled temperature are increased, and the water consumption is increased too. According to the technical argumentation, the two units and single circulating water tower operation technology was adopted, the icing in water tower was avoided, the terminal temperature difference and the subcooled temperature were decreased, the water consumption was also reduced, and obvious economical benefits were obtained. 

Application of centralized auxiliary network control system based on Xinhua XDPS-400e in Zehua Power Plant

WANG Jian;MA Liang

2011, 33(1): 33-35.

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The design and application of the 2×330MW auxiliary network distributed control system of Luohe Power Generation Corporation Limited Zehua Power Plant project phase I were introduced. The features and the technical parameters of this auxiliary network were pointed out; the design idea and the working mode were analyzed, and typical application example of the auxiliary network established based on Xinhua XDPS-400e distributed control system was provided.

Discussion on real devices test method in electric starting test of large power unit

FAN Tao

2011, 33(1): 36-37.

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The importance of real devices test in electric starting test was expounded. Aiming at main electric protection of different devices, the concrete test methods were put forward, and some suggestions for relay protection real devices test were given.
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Development of video surveillance system for highvoltage switch

LI Yongqing;FU Shiping;LIU Yan;JIANG Bohua

2011, 33(1): 38-39.

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A dynamic video image surveillance system for highvoltage switch was introduced. The system was designed specially to adapt to the structure features and operation characteristics of highvoltage switch. In this system, the highspeed infrared camera technique was used, which can monitoring realtime the highspeed sharp image of the internal structure of the highvoltage switch, can record, track, analyze and identify the video image in long term. The video surveillance system will play an important role for ensuring the safe and stable operation of the power system and enhancing the automatic dispatch level and the maintenance level of power system.

Analysis of abnormal occurrence of WDPF system manual operation station

YAO Xiujuan;LIU San;HE Hui

2011, 33(1): 40-43.

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Since the WDPFII distributed control system of Huadian International Zouxian Power Plant had been put into operation, the MA station was switched over from AUTO mode into LOCAL mode many times. It was decided by analysis that the abnormal occurrence is caused due to that the output frequency of the UPS, which supplies power for the WDPF system, was varied rapidly. It is desired that the result can be used as reference for fault analysis of similar DCS system.

Reason analysis of unit power interruption accident caused by water spurt from　crack in the pipe

HUANG　Haibo

2011, 33(1): 44-47.

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In a power plant, the water spurt from crack in the pipe caused an instant earthing fault in 110kV line, and the zero sequence differential protection of start and standby auxiliary transformer No.1 was tripped incorrectly and caused the accident scope enlarged. The phenomenon of the accident and the accident treatment process were expounded. The experiences of the accident treatment were summarized. The problems exposed in the accident were analyzed. According to the protection action report and the accident field situations, the accident developing process and the action behavior of the relay protection were analyzed; and some concrete preventive measures were given.

Reason analysis of output deficiency of Milroyal metering pump and treatment

WANG Zhangsheng;WEN Shiwei;LIU Zhanli

2011, 33(1): 48-49.

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The working principle of the Milton Roy hydraulic membrane metering pump was introduced. The reason of the output deficiency of the membrane pump in operation was analyzed, and relevant solving method was put forward, which can be used as reference for daily maintenance and troubleshooting of the membrane metering pump.

Reason analysis and treatment measures on frequent jitter of high pressure and low pressure regulating valves of small steam turbine

LIN Chun

2011, 33(1): 50-52.

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In Fujian Huadian Kemen Power Generation Corporation Limited project phase I, when the unit operated under high load, the high pressure regulating valve of the small steam turbine was opened, a great quantity of cool reheating steam participated in working, and the high pressure regulating valve and low pressure regulating valve jittered frequently in large amplitude. According to analysis, it was considered that the fault reason is the setting of the overlap of high pressure regulating valve and the low pressure regulating valve of the small turbine tended to be larger. The degree of overlap had been modified in accordance with the value recommended by the manufacturer of the microelectrohydraulic control system devices, and the unit can operate normally in full load. 
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Analysis on leakage reasons of the tubes in water wall of a power plant boiler No.2

CHEN Jianjun

2011, 33(1): 53-54.

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Aiming at the tear and leakage in buttjointed seam of the fastening combshaped plate for water wall tubes, according to the comprehensive analysis on the parts structure, the strained conditions, the operation environment and the welding quality, the main reasons caused tearing were affirmed, and some pertinent treatment measures were put forward.

A technical reformation of furnace refractory belt of one power plant boiler

WANG Xiaopeng;YUE Yinfu;FENG Yong;TIAN Hongwei

2011, 33(1): 55-56.

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Taking the unit No.7 of Henan Zhongfu Industry Corporation Limited as an example, the technical requirement of furnace refractory belt design for power plant boiler was introduced. The technical reformation of furnace refractory belt of power plant boiler and relevant construction technology were expounded. This technical reformation is suitable for the boilers, in which the input flow of desuperheating water is smaller and the steam temperature adjustment is difficult. After the reformation, the input flow of desuperheating water was increased, the slagging in furnace was mitigated, and the effect of the main steam temperature adjustment became better.

Experience of commissioning of 135MW domestic circulating fluidized bed boiler

WANG Haibo;XIANG Ligang

2011, 33(1): 57-59.

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The basic situation of DG440/13.7-II2 type 135MW circulating fluidized bed boiler in Henan Yima Ganguefired Power Plant was introduced. The processes of the cold functional test, the ignition pressurization and operation were expounded. The problems occurred in debugging were summarized, and the solving methods were put forward. After the adjustment based on combustion optimization test, the continuous operation ability and the reliability of the boiler had been raised. The experience can provide reference for similar units.

Application of metalsealed ball valve in draining system of thermal power plant

YUAN Xiongjun;FU Zhongxuan;ZHANG Min

2011, 33(1): 60-62.

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The characteristics of draining system of thermal power plants and the use of drain valve were introduced. The technical characteristics of metalsealed ball valve were compared with those of traditional cutoff valve, and the technical characteristics of new type metalsealed ball valve were compared with those of traditional metalsealed ball valve. The conclusion obtained by the comparisons is that in the power plant startup drain system, the traditional cutoff valve will be replaced by the metalsealed ball valve gradually.

Pneumatic conveying test of cementitious material with hectometerlevel large drop

LIU Li;LIU Zekun

2011, 33(1): 63-64.

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The method of pneumatic conveying of cementitious material with hectometerlevel large drop was introduced. The rationality and the feasibility of the technical scheme of pneumatic conveying of cementitious material with large drop were expounded, which provides the site experimental data and the technical scheme for Xiaowan Hydropower Station to convey the cementitious material with large drop in its construction and installation period. 

Application of electrostatic demist technology in coalfired power plant

LIN Zuhan

2011, 33(1): 65-68.

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The electrostatic demister has powerful function of trapping the fogdrop and the small dust particles and had been used in petrochemical and metallurgical industrials for more than 30 years. The working principle of the electrostatic demister was introduced; the development situation of the electrostatic demister in our country was expounded. Aiming at the operating environment of power plant, the key technology for developing higheffective electrostatic demister with high gas velocity was put forward. It was pointed out finally that the application and dissemination of the electrostatic demister in coalfired power plant will be helpful for energy conservation and emission reduction. 

Energysaving reformation of closed cooling water system of thermal power plant

CHEN Peng;SHI Zhaohui;SONG Youxiang

2011, 33(1): 69-70.

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The problems occurred in operation of the closed cooling water system were introduced. The feasibility of the energysaving reformation for the closed cooling water system was analyzed. After the relevant measures were adopted, and obvious energysaving effects were obtained.

Reformation of electrostatic precipitator control system in 600MW power plant

CHAI Zuyun;SUN Dongxin;LI Lizhi;LIANG Junbin

2011, 33(1): 71-74.

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The energy saving reformation of electrostatic precipitator control system in Hebi Fenghe Power Generation Corporation Limited was introduced. The energy saving theory of electrostatic precipitator control system was explained; the reformation scheme and construction plan were described; the significances of the power controller and the turbidity meter feedback for energy saving control were expounded. By comparing with the operation condition before reformation, it was proved that after reformation the more excellent technical data were achieved, the energy saving efficiency was increased, and the automation level of operation and management was raised. The significance of the energy saving reformation of electrostatic precipitator control system was affirmed, and its application and dissemination in power plant were analyzed and forecasted.

Discussion on technology of reusing petrochemical waste water as circulating cooling water of power plant

QIN Haixia

2011, 33(1): 75-77.

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After advanced treatment, the regenerated water can be reused as circulating cooling water of power plant. The advanced treatment process of the petrochemical waste water in a power plant was introduced. In this process, the aeration biological fluidized tank + coagulation clarification process were adopted to treat the petrochemical waste water; the coagulation clarification treatment with adding lime was adopted to treat the exhaust waste water of power plant circulating water. The two kinds of waste water are merged, and then are filtered in the filter with variable holes. The quality of the output water of the filter can attain the standard of power plant circulating cooling water and is used in production.

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