Integrated Intelligent Energy

Application of partial discharge online monitoring technology for steam turbine generator

JIA Han;SHAN Ming

2011, 33(4): 1-4.

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The classification and characteristics of partial discharge signal of high rating generator, and the application of PDA monitoring method in stator insulation monitoring were introduced.The influence of the capacitor coupling unit in the partial discharge online monitoring system and its frequency response on performance of monitoring system was analyzed qualitatively. The application of PDA technology in partial discharge online monitoring of 150 MW No.2 generator of Huadian Tengzhou Xinyuan Thermal Power Company Limited shows that this technology can analyze and diagnose, and can correctly judge the problem existing in generator insulation to give evidence for company to arrange and implement the maintenance plan.

Application of large flux oil circulating washing method in steam turbine of thermal power plant after overhaul

QIU Xinming

2011, 33(4): 5-8.

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The two stage oil circulation technology applied in steam turbine washing after its overhaul was expounded in detail and compared with conventional oil circulating mode. Comparing with conventional oil circulating mode, the two stage oil circulation technology is more simple and feasible; it can provide better washing effect and can shorten oil circulating washing time, which is useful to ensure the limit time for overhaul work.

Temperature monitoring and faults treatment for stator winding of 1 000 MW turbo generator

LI Cunhuai;YANG Lei

2011, 33(4): 9-11.

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In the Huadian International Zouxian Power Plant, the displayed temperature data of several measuring points in stator winding of 1 000 MW turbogenerator were abnormal. The elements installation and connection were inspected; the problematical elements were tracked and measured. Based on this, it was determined that there was electromagnetic interference and‘ground loop’ problem in temperature measure process. Aiming at the found problems, the temperature measurement of the turbogenerator stator winding was optimized and improved, so the accuracy of the temperature measurement of turbogenerator stator winding was ensured.

Analysis on reasons of crack of 600 MW steam turbine highpressure cylinder and treatment

HOU Shiyong;ZHANG Yanfei

2011, 33(4): 12-14.

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In overhaul of 600 MW unit of Huadian Inner Mongolia Energy Corporation Limited Baotou Power Generation Branch Company, it was found that cracks were occurred in highpressure outer casing. The reasons of the cracks were analyzed. The advantages and disadvantages of several patch weld technologies were compared. Finally, the lowtemperature preheating nickelwelding materialused patch weld technology was selected and adopted, and favorable effect was obtained.
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Discussion on consistency of development and test for control and protection products

MA Yicheng;ZHANG Juliang;JIA Xiaojie;LI Honggang

2011, 33(4): 15-17.

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The periods of upgrading and updating of products are more and more short, and this leads the repeatability of test. The functions of products are more and more complete, and this leads the complexity of test. According to the requirement of product consistency and the modularization characteristics, the test method in accordance with the consistency of development and test was put forward. Based on the modularization and the tabular mode of test and established test method, the test effect and the consistency of the product modules were ensured, and the accumulation of test experiences have certain directive functions for product design.

Application of TSP203 advanced geologic prediction system in diversion tunnel of Lizhou Hydropower Station

HUANG Chao;HOU Zhongfa

2011, 33(4): 18-21.

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In construction of diversion tunnel of hydropower station or other underground chamber, the collapse, the solution cavity, high pressure surging water, large fault and other adverse geologic sections often appear, which cause large potential hazard for construction safety. Usually the geological drilling was adopted to explore the geologic situation ahead, but this method can explore only shorter distance and consume longer time. The use of TSP203 advanced geologic prediction system can solve abovementioned problems effectively. The successful application of this system in construction of hydropower engineering has provided reference for other similar underground complex project construction.

Application of feedforward and integral separation in coordinative control of supercritical unit

LI Xinjian

2011, 33(4): 22-25.

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The static feedforward linear relation and dynamic feedforward control technology were introduced. Aiming at the characteristics of coordinative control for 2×670 MW supercritical unit in Weifang Power Generation Company Limited, the main points of the boiler instruction, fuel instruction, water feed instruction and fuel calorific value (BTU) correction in coordinative control of supercritical unit were expounded. The application effects of the integral separation were analyzed.

Designed types and selection of coal receiving equipments for coal trucks

ZHAO Yashan

2011, 33(4): 26-29.

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The types of coal receiving equipments in common use, and different types and length of slot type coal bin for coal transport truck were introduced. The advantages and disadvantages of three types of coal receiving equipments were compared qualitatively, their use scopes and matters needed attention in design were listed. Some suggestions on designs of the truck scheduling yard, the coal metering and sampling, the environmental protection, etc. were put forward, which can be used as reference for related design.

Structure and application of hightemperature highpressure parallel double gate valve for power plant

XU Xiuran

2011, 33(4): 30-31.

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The frequentlyused structure and the characteristics of hightemperature highpressure parallel double gate valve were introduced. Some key points in structure design and manufacture of this valve were put forward. This gate valve has many advantages, which cause the gate valve will be applied in steamwater system of large thermal power units more widely.

Vacuum system leakage detection method for unit No.2 of L Power Plant in Indonesia

CAI Youmin;ZHANG Caiwen;WAN Zhijiang;ZHU Ciying;GUO Yibing

2011, 33(4): 32-34.

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The vacuum system fault of steam turbine No.2 of L Power Plant in Indonesia was introduced. The reasons caused the vacuum system fault were diagnosed and analyzed. Using the filling water method and the Helium mass spectrum leakage detector to find the leakage point of the vacuum system, the especially big leakage point was found in lower half casing of low pressure cylinder. The effective measures were adopted, and the condenser vacuum leakage fault does not occur again.

Leakage detection of unit No.3 vacuum system in a power plant and treatment measures

WANG Bin;

2011, 33(4): 35-36.

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The result of vacuum leakage test of unit No.3 in a power plant was below standard all the time after its minor repair in January 2009; the decreasing speed of the condenser vacuum in testing basically remained in 600 Pa/min. The leakage of the vacuum system was detected by using the vacuum leak detector, and related leakage points were found. The suggestion for system improvement was put forward. The leakage points were plugged, and the system was improved; so the result of vacuum leakage test of unit No.3 became qualified.

Analysis on reasons of corrosion in inner wall of CFB boiler water wall tubes and treatment measures

ZHENG Huixiana;XU Huifena;HE Libingb

2011, 33(4): 37-38.

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In the Thermal Power Plant of Zhejiang Jiangshan Chemical Corporation Limited, due to corrosion of inner wall of CFB boiler water wall tubes, the tube cracking accident was occurred many times for short term. Using the steel tube corrosion scanning detector, the remote field eddy current testing for water wall tubes in key area was carried out. By many times analysis, the corrosion defect positions were found, and the corrosion reasons were determined. The relevant preventive measures were adopted, and the tube cracking accident does not occur again.

Arcdischarge fault detecting and locating device for switchgear

HAN Dong;WANG Zhenyue;SUN Jinguo

2011, 33(4): 39-40.

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The arcdischarge fault detecting and locating device for the switch gear were expounded, in which the design of various units of several function modules was included. By combined use of the fault current detection method, the arc light probe technique, the arc light imageforming principle and the virtual instrument platform technology, the device can detect the arcdischarge fault occurred in the switchgear and locate the fault; and the detection results can reflect the occurring and developing process of the arcdischarge fault inside switchgear, which provides the basis for subsequent arcdischarge fault analysis.

Application of high gradient magnetic filter in heat supply reformation project of a thermal power plant

ZHOU Jianwei;WANG Jilun;LI Liangwu;LIU Shanbo

2011, 33(4): 41-43.

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There is a mass of ferric ion in condensed water of steam heat supply system of thermal power plant in winter; and this condensed water can not be reuse directly. The domestic deferrization filtering device can not suit the site water temperature of 150 ℃.In Huadian International Shiliquan Power Plant, the highgradient magnetic filter was used to remove the ferric ions in condensed water; and the water quality can satisfy the demand of boilerused water quality. The effects in water conservation and energy conservation of this deferrization technology are remarkable.

Analysis on cracks of water wall in 1 000 MW ultrasupercritical towertype oncethrough boiler and treatment

TANG Haoyi;SHENG Weimin

2011, 33(4): 44-46.

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The type of the cracks of water wall, the material of which is T23 steel, in 1 000 MW ultrasupercritical towertype oncethrough boiler in a power plant was introduced; and the structure of leakage fault position was described. The reasons of the cracks were analyzed; and effective solution was put forward.

Analysis on defect of pressure monitoring circuit of protection devices

SHU Yishi;MA Yong;WEI Min

2011, 33(4): 47-48.

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The pressure monitoring circuit of relay protection secondary circuit was introduced. The defect of pressure monitoring circuit of protection devices in new line protection design specification was analyzed, which is that when the first group operating power source is cut off; the second group operating circuit will be broken simultaneously, the breaker will be blocked incorrectly and can not trip after the line fault occurred. A solving scheme was put forward, in which the protection device will only block the reclosing mechanism, and the blocking of breaker open and close will be realized by secondary circuit of the breaker itself.

Analysis on problems existed in emergency governor of 330 MW unit and countermeasures

WEI Xiaobao;SHAN Hongliang

2011, 33(4): 49-51.

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In debugging of the 330 MW unit of a power plant, it was found that the stay hook of the emergency governor can not reset sometimes. According to analysis, the reason of the defect mentioned above is that the moment of torsion of parallelarranged doublesupported springs installed in location near the stay hook is insufficient. The moment of torsion of the springs was increased by some means, and the problem of stay hook reset was solved.

Analysis on reasons of lower feed water temperature of domestic 200 MW unit and treatment

SHEN Zhongyong;JIA Gongli;ZANG Xiao

2011, 33(4): 52-54.

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The feed water temperature is an important economical index, which influences on the coal consumption rate directly, and finally influences on the generating cost. The structure, operation characteristics and thermal insulation of highpressure heater, lowpressure heater, pipeline and valves were analyzed; and based on this analysis, the factors influencing on feed water temperature were found; the measures for increasing the feed water temperature were determined. By continuous perfection of relevant measures, the economical benefit of the unit operation can be further increased.

Application of mechanical seal in boiler feed pump of power plant and fault analysis

YAN Chuanwu;WANG Zhangsheng

2011, 33(4): 55-56.

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The structure of mechanical seal of boiler feed pump in a thermal power plant in India and the arrangement of its sealing circulating liquid pipeline were introduced. The working principle of the mechanical seal and the influence of the higher temperature of mechanical sealing liquid on the sealing property were expounded. Combining with practical project, the reasons of the higher temperature of sealing liquid caused by its leakage were analyzed, and relevant solving measures were put forward.
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Analysis on operation of generator without non fullphase protection

XI Junming

2011, 33(4): 57-58.

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Aiming at the practical operation situation of Hebei Guohua Cangdong Power Generation Corporation Limited, the similarities and differences of the generator non fullphase protection and the breaker non fullphase protection were compared. When the non fullphase operation state occurred and the generator non fullphase protection was not configured, the behavior of the generator negative sequence inversetime limit protection was analyzed. It was pointed out finally that there is certain need to configure the generator non fullphase protection for the unit without generator non fullphase protection, which can cut off the failure parts for shorter time when the non fullphase situation under rated condition occurs; and the safety of the generator will be protected.

Numerical simulation of flue gas distribution in multiple desulphurization towers using active coke

WEI Xing;ZHAI Shangpeng;LIU Jing;ZENG Yan;ZHANG Peng

2011, 33(4): 59-62.

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By using numerical simulation method, the flue gas distribution of flue gas purification desulphurization equipment integrated from multiple desulphurization towers using active coke was studied. The nonuniformity of gas flux existed between various desulphurization towers and between various adsorption units was found and revealed. In order to enhance the desulphurization efficiency of the equipment and the use ratio of the active coke, multiple hypothetical regulating schemes were tried, compared and filtered. The research result shows that the flue gas distribution can be regulated uniform by changing the diameters of the flue gas inlet branch pipes.

Transformation for energysaving of condenser air extraction tube of 600 MW units

SUN Ruming;NI Ping;YANG Jianping

2011, 33(4): 63-67.

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The analysis on the operating parameters of unit No.1 and No.2 condensers in Huadian Inner Mongolia Energy Corporation Limited. Baotou Power Generation Branch Company found that the terminal differences of low back pressure condensers were larger, and the heat transfer deteriorated, the technical improvement scheme was proposed and implemented, after that the vacuum of low back pressure condenser increased to above 0.4 kPa, created good economic benefits, it can be as the reference for energysaving improving of the same type unit.

Analysis on reasons of larger consumption of acid and alkali in chemical ion exchange desalting process

LI Lianming;YU Beiliang;QI Shunshan

2011, 33(4): 68-69.

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The reasons of larger consumption of acid and alkali in exchange resin regeneration of a power plant were analyzed. By taking full advantages of existing equipment and technology without new investment, the regeneration process was improved; the resin regeneration degree and the water quality were raised; the operation period of the resin was lengthened; and the consumptions of acid and alkali were reduced.

Application of roof gridconnected photovoltaic power system in 110 kV substation

ZHAO Fei;SHEN Hongfeng;WU Weijiang

2011, 33(4): 70-74.

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The project of configuring the photovoltaic power system in 110 kV substation was researched. A scheme was put forward, in which the photovoltaic cell panels will be installed on rooftop of the substation buildings to construct the gridconnected photovoltaic power generation system. The photovoltaic system will translate the solar energy radiated on substation into electric energy, which can be used as supplemental power source for substation load power supply. 

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