Integrated Intelligent Energy

Analysis on blended burning experiment of Indonesian coal in 300MW coalfired unit

HONG Changshao

2011, 33(6): 1-4.

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Taking the blended burning of the Indonesian coal in a power plant as example, various blended burning experiments with different blending ways were carried out, the purpose of which is to evaluate the influence of blended burning of the Indonesian coal on the boiler burning system and the coal pulverizing system. Based on the comparison of site experiment and coal analysis, the operating characteristics of the boiler blended burning Indonesian coal were known well; the rational operation mode was provided for the boiler blended burning Indonesian coal, and certain reference was provided for other power plants in blended burning of Indonesian coal.
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Application of ‘lengthwise store and breadthwise take’ coal yard storage method in coal blending of power plant

LU Changde;MA Bo;WANG Qingan

2011, 33(6): 5-7.

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In Huadian Weifang Power Generation Corporation Limited, according to the coal asreceived with different coal grade and the field practical requirements, in coal storing on coal yard and coal feeding for boilers, the different coal blending schemes were compared, and a simple, practical, easy for management and industrialized coal blending method was summarized; which can be used as reference for other power plant in coal blending.

Management of coal blending for 335MW unit

FANG Yonghai;WANG Xiaozhu;WANG Zhiqiang

2011, 33(6): 8-10.

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The influence of chemical compositions of coal on the boiler operation was expounded. The coal quality for the 4×335MW units of Huadian International Zouxian Power Plant was analyzed. According to the coal blending theory, the rational and scientific coal blending method was put forward. 

Analysis on largeratio ligniteblended burning scheme in thermal power plant

CHEN Lizhi

2011, 33(6): 11-12.

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In order to enlarge the coal source and reduce the coal price, Huadian Harbin Thermal Power Corporation Limited has tried to blend lignite, which was produced in Inner Mongolia Baorixile, with definite proportion to adjust the coal grade composition, certain economical benefits were obtained. The analysis and statistics for the operation parameters of the boiler burning ligniteblended were done, it was expected that the analysis result can be used as reference for ligniteblended burning.

Design and implementation of spraying system of coal conveyor belt in thermal power plant

WEI Xia;LIU Bo

2011, 33(6): 13-15.

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The belt spraying system is effective tool to control the dust pollution of coal conveyor system in thermal power plant.Due to that the belt spraying system is auxiliary equipment, so persons often do not pay sufficient attention to it. Some times, the unit had been put into operation formally, and the belt spraying system can not operate properly yet.Various problems, which happened during design, construction and commissioning stages of the coal conveyor belt spraying dustfalling system in 2×330MW cogeneration project of Urumqi Thermal Power Plant of Huadian Xinjiang Power Generation Corporation Limited,were discussed.The design optimization scheme of coal conveyor belt spraying dustfalling system for newly constructed thermal power project was put forward.It was proved by the practice that this scheme can simplify the design,and the system can be put into operation more reliably and stably.

Optimized design and reformation for coal handling system of 2×300MW unit

GUAN Shaojiang;WANG Wei;DAI Shuxiang

2011, 33(6): 16-18.

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The design of the coal handling system of a newlybuilt power plant is not rational, many problems occurred in some equipments operation, and there are potential safety hazards to the system. The problems were analyzed and discussed. Combining with site practical situations, the treatment methods were put forward to ensure the safe operation of the system. 

Influence of coal grade on combustible matter in flyash of CFB boiler

HAO Mingyue

2011, 33(6): 19-20.

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The influence of the particle size distribution, the volatile matter and the ash content of the fired coal on the combustible matter in flyash of CFB boiler was analyzed. The reasons of higher mass concentration of combustible matter in flyash were expounded; and concrete improvement proposal was given.

Application of automatic material control system in coal conveying programmed control system

SUN Qingwu;LU Weidong;WANG Wei

2011, 33(6): 21-22.

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The SQUARE-LK-2 automatic material control system and its working theory were introduced. The composition and main technical data of the SQUARE-LK-2 automatic material control system and the technical requirements of the system installation were expounded. The application of the SQUARE-LK-2 automatic material control system in coal conveying system can resolve the problems of prevention and alarm of jamming of the coal conveying and dropping pipes effectively.

Function of 9Eseries gas turbine power generating set in peak load regulation of power grid

WU Qiang;HOU Xingheng;FAN Fang

2011, 33(6): 23-26.

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According to the structure characteristics of 9Eseries natural gasfired combined cycle units in Shanghai Power Grid, the role of these type units in peak load regulation of power grid was arranged. The technical and economical characteristics of natural gasfired combined cycle unit were analyzed and compared with the economical efficiency of 300MW, 600MW and 1000MW coalfired units; and it was pointed out that the gas turbine combined cycle power generation has advantages of comprehensive utilization of energy and higher efficiency. Based on analysis of main equipment operation reliability of 9Eseries combined cycle units, a conclusion was obtained that the reliability of 9Eseries units in load regulation operation is better than that of other type units. 

Field welding method of T91 steel hightemperature superheater tube of boiler

PENG Chong

2011, 33(6): 27-28.

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The T91 steel has poor weldability, stronger coolcrack sensitivity and certain hotcrack trend; so its field welding passing rate is lower. According to the site practical situation of the 300MW cogeneration project of Hubei Huadian Huangshi Power Generation Corporation Limited, the T91 steel superheater tube field welding of this project, the argon filling method and related matters needing attention were summarized, providing reference for similar power plant in T91 steel tube welding.

Analysis on stall fault of primary air fan in a large thermal power plant and preventive measures

GAO Xi;LI Qingang

2011, 33(6): 29-31.

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Two adjustable movable blade type axial flow fans are configured in boiler of a power plant as primary air fan. Since they were put into operation, the stall fault occurred frequently, and this influenced on safe operation of the unit seriously. According to the experiment and adjustment of the primary air fans of the unit, the reasons of stall fault of the fans in practical operation were analyzed. From the angle of operation technical management, the prevention and treatment measures of fan stall fault were put forward, which can be used as reference for operators of similar fans in prevention and treatment of primary air fan stall fault.
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Adjustment of shaft system center of M701F gas turbine after alone disassembly and rotor replacement

JIN Yanhai

2011, 33(6): 32-34.

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Aiming at the problems, which were occurred in centering of shaft system of current domestic Fclass gassteam combined cycle unit after the gas turbine rotator was replaced, some feasible adjustment measures for centering of shaft system were put forward. These measures can be used as reference in similar gas turbine overhaul.

Analysis on measurement of flow passing through hydraulic turbine

HE Xiaobo

2011, 33(6): 35-36.

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The flow measurement method by using differential pressure transmitter is used in hydropower stations currently. In this method, according to that the water flow in the volute casing abides by the law of constant velocity torque, combining with the Bernoulli equation and the water flow similarity law, the relation between the flow and the pressure difference can be obtained; and by processing, the flow can be calculated. The effects of differential pressure transmitter use are not ideal in many hydropower stations. Starting from the angles of experience, installation and data processing, the reasons of deviation of measured value were analyzed; and relevant solutions were given. 

Erection of 1.5MW large horizontal axis wind turbine generator system

LUAN Huaidong;YU Zhenghua;SHAO Zhufen

2011, 33(6): 37-39.

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A 1.5MW large horizontal shaft axis wind turbine generator system was erected in Hebei Huadian Guyuan Wind Power Corporation Limited project phase I. The structure features, erection technological process, the key points of the erection engineering and the debugging terms before commissioning of the wind turbine generator system were introduced; which can be used as reference for erection of similar wind turbine generator system.

Analysis on vibration measurement experiment under synchronization condition with power changing of Asahan First Stage Hydropower Station

CHEN Wei;WANG Zhihao;ZHOU Qingke

2011, 33(6): 40-41.

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The vibration measurement experiment under synchronization condition with power changing of Asahan First Stage Hydropower Station was studied. Starting from the aspects of the +x/+y swing amplitudes of upper guide bearings and others, the measuring steps of the vibration measurement experiment under synchronization condition with power changing were expounded; and the relationship between the vibration zone and the operation stability of related unit was analyzed emphatically, which can provide some references for other oversea projects.

Analysis on defect of vibration online monitoring device for generator stator winding head and treatment

LUO Yuhuan

2011, 33(6): 42-44.

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The method and the process of defect treatment of online vibration monitoring device for generator stator winding head were introduced. Using the subsection excluding method and the frequency analysis method, the possibility of generator resonance fault was excluded, and the generator emergency shutdown accident was avoided.

Method to prevent shaft seal locking fault of 1000MW steam turbine in startup and shutdown processes

WU Chunchao;WANG Feng;CHEN Li

2011, 33(6): 45-16.

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The accident of shaft seal locking of 1000MW domestic steam turbine was happened repeatedly. The structure of the shaft seal and the characteristics of its steam supply control system were introduced. The reasons of shaft seal locking were analyzed; and relevant solution was put forward, which is helpful to ensure safety of steam turbine in startup and shutdown processes.

Method for increasing firsttime qualification rate of cement cushion fabrication

WEI Xiaobao

2011, 33(6): 47-49.

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Combining with site statistical data, various steps of cement cushion fabrication were introduced. The main reasons of the lower firsttime qualification rate were analyzed. Relevant countermeasures were given, and the firsttime qualification rate of cement cushion fabrication was increased.

Improvement of air flow measuring device for boiler

ZHAO Anmin

2011, 33(6): 50-51.

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The original air flow measuring devices of 4×300MW unit boiler of Huaneng Pingliang Power Generation Corporation Limited. Project phase I were blocked by dust frequently. In order to eliminate the blockage fault, the technical reformation for the air flow measuring devices was carried out, and the multipoints plugin type dust selfcleaning air flow measuring device was adopted. The measurement accuracy was enhanced; the security and reliability of the unit protection equipment and the economical efficiency of boiler operation were ensured.

Remedial measures for aging of generator stator temperature measuring element

YE Chaoping;CHEN Xixin

2011, 33(6): 52-54.

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The fault of temperature measuring element of unit No.2 of Guangdong Yudean Xinfengjiang Power Generation Corporation Limited was analyzed. The remedial method and steps of stator temperature measuring element aging were expounded. The actual effects of the remedial measures were evaluated.

Comparison of two methods for measuring liquid density in absorption tower using mass flow meter and pressure transmitter

WU Hongfeng

2011, 33(6): 55-56.

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Two methods for measurement of liquid density in the absorption tower of thermal power plant FGD project were introduced, which are the Coriolis force mass flow meter density measuring method and the diaphragm pressure transmitter density measuring method. The advantages and disadvantages of the two methods were compared.

Reformation of heating way used in electric control room

ZHANG Yong;ZHANG Xingshun;WANG Xiujuan;CAO Yanan;HU Zhijian

2011, 33(6): 57-58.

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Keeping to the state requirement on control room heating way, the reformation scheme of electric control room heating was put forward, in which the floor heating way was adopted. After the scheme was implemented, the work environment of onduty staffs becomes better.

Adjustment of main steam temperature and reheat temperature of 300MW boiler

HU Zhijie

2011, 33(6): 59-62.

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The main factors influencing on the main steam temperature and the reheat temperature during unit normal operation and boiler start-up and shutdown process were introduced. The accidents maybe caused by excess high steam temperature or too low steam temperature were expounded emphatically; the reasons of these accidents were analyzed; and concrete adjustment method was given, providing reference for treatment of similar problems.

Analysis and treatment of lower insulating strength of enclosed busbar of generatortransformer unit

XIAO Yajuan

2011, 33(6): 63-64.

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After the generatortransformer unit of a power plant is shutdown, the insulating strength of the enclosed busbar of the unit often decreases more or less. Taking the Shaoguan Power Plant as example, the features and the reasons of the lower insulating strength of the enclosed busbar were analyzed. The experience of site treatment was summarized; and concrete treatment method was given.

Variable frequency reformation of condensate pump

TANG Shimin;FANG Yuan

2011, 33(6): 65-66.

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Aiming at the higher energy consumption and lower efficiency of the condensate pump system in a power plant, the necessity of variable frequency reformation for the condensate pump was expounded. The improvement of operation reliability and economical efficiency of the condensate pump after reformation comparing with that before reformation was analyzed. After reformation of condensate pump, the power consumption was decreased, the operation cost was reduced, and obvious energy conservation effect was obtained.

Analysis on reason of enlarged flow of EH oil of 330MW unit and treatment

GAO Ming

2011, 33(6): 67-67.

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After the 330MW unit of a power plant was shut down and started up again, it was found that the flow of the EH oil increased from 18L/min to 95L/min (its normal value range is 15L/min to 25L/min); and the current of the motor of EH oil pump was exceeded the limit, and the temperature of the motor was higher. Based on checking analysis, the internal leakage point had been found; and this internal leakage causes the larger flow of the EH oil flow; and the defect was eliminated gradually in unit operation. The flow of EH oil was decreased to 18L/min, and an unplanned outage accident was avoided, and safe and stable operation of the unit was ensured.

Fault diagnosis and reformation of absorption tower agitator in 600MW unit FGD system

YIN Pengfei

2011, 33(6): 68-71.

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The corrosion and fracture of agitator blade of absorption tower in unit No.3 desulphurization system of Jinwan Power Generation Corporation Limited. were analyzed. Combining with practical situation of the engineering design, the preventive and improvement measures were put forward to ensure safe and stable operation of the desulphurization system.

Optimization of equipment control scheme for flue gas desulphurization system

ZHOU Genlai;LI Chaoqiong;ZHAO Xinhong

2011, 33(6): 72-74.

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The main equipments of flue gas desulphurization system and their control tasks were introduced. Some control schemes for the oil station of booster fan, the seal fan and the heater were expounded. The control scheme of bypass damper of desulphurization equipment was put forward, in which the adjustable type driving device and the switchtype driving device are combined. These schemes can be used as reference for similar flue gas desulphurization systems.

Energysaving optimized reformation of circulating water system and forced draft fan

CHEN Xiaodong;XIANG Guanglu

2011, 33(6): 75-77.

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The optimization of circulating water system and the energysaving reformation of the forced draft fan of Shenhua Zhejiang Guohua Zheneng Power Generation Corporation Limited. were introduced. After the energysaving optimized reformation, the house service consumption rate and the net coal consumption rate were decreased effectively; and the operation benefit had been maximized. 

Reuse of discharged water from circulating water system in power plant

LI Hongxiu;LI Wenjie;YU Baoyuan

2011, 33(6): 78-80.

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According to the comparison of the immerged ultrafiltration technical scheme with the pressure type ultrafiltration technical scheme, a conclusion was obtained that adopting the immerged ultrafiltration combining with reverse osmosis technology to treat the discharged water from the circulating water system can satisfy the requirements of predesalination for boiler feedwater, and 2.4 million tons fresh water can be saved in a year; this provides a new thinking for water conservation in power plant. 

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