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中文
Table of Content
25 September 2014, Volume 36 Issue 9
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Application of system optimization analysis program in 680MW ultra supercritical unit
ZHAO Zhihong1, LIU Ji1, WANG Li2, SU Yunshan1, LI Jinli2
2014, 36(9): 1-5.
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Abstract:The boiler of 680MW ultra supercritical unit of a power plant was studied. The comprehensive optimization experiment of the adjustable parameters of boiler operation was carried out, and the data representing the boiler operation features were obtained. The system optimization analysis program (SOAP) was used to sift the experimental data. By means of the artificial intelligence neural network technology, the optimized operation mathematic model was established. Based on the mathematic model, the economic efficiency and the reliability index of the boiler system were optimized and coordinated completely, and the optimal operation mode of the boiler system under various load conditions was realized.
Design features of nonbypass flue gas desulphurization equipment of 1000MW unit
ZHANG Yuming1, PENG Bin2
2014, 36(9): 6-7.
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Abstract:Aiming at the design features of the desulphurization equipment of the 2×1000MW unit in Jiangsu Huadian Jurong Power Generation Company Limited, the defects of the limestonegypsum wet FGD equipment, such as blockage, wear and corrosion, were analyzed. The effective measures were adopted, and the reliability of the nonbypass flue gas desulphurization equipment was improved.
Design of special lifting scheme of “three devices” inside towertype boiler of 1000MW unit
WU Desheng
2014, 36(9): 8-10.
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Abstract:There are larger difficulties in installation of tower type boiler of 2×1000MW unit in Pengcheng Power Plant. Especially, the installation of the “three devices” inside the boiler is difficult point in the boiler installation due to condition restrictions. Starting from the angle of installation technology, a hoisting system was designed, and the technical difficulty in lifting of the “three devices” inside boiler was solved. Better economic benefit and social effect were obtained.
Optimized layout scheme of coal as fired middle mechanical sampling devices
LI Meilin, LONG Wei
2014, 36(9): 11-12.
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Abstract:The coal as fired middle mechanical sampling devices layout schemes in multiple layers and in the same layer of power plant and the main technical parameters were introduced. The two layout schemes of coal as fired middle mechanical sampling devices were expounded. The technical economic performances of the two layout schemes were compared with each other.
Protection scheme of stator grounding fault of large gassteam combinedcycle generator
SHEN Quanrong1, WANG Lei2, CHEN Jun1, YAN Wei1
2014, 36(9): 13-15.
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Abstract:The characteristics of large gassteam combinedcycle generator and its influence on stator grounding fault protection were introduced. A complete large gassteam combinedcycle generator stator single phase grounding fault protection scheme was proposed. In the scheme, the shortcoming of previous large gassteam combinedcycle generator stator grounding fault protection scheme was overcome. The scheme was applied widely on many domestic and abroad 390MW level large gassteam combinedcycle generator units, and favorable effects were obtained.
Application of flow compensation calculation configuration of distributed control system
CHEN Le
2014, 36(9): 16-18.
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Abstract:The application of DCS flow compensation calculation configuration of Emerson OVATION system was taken as practical example. The first step is to obtain the flow calculation sheet of the flow measuring devices. Then, according to practical fluid characteristics, the next step is to select the correct and verified flow compensation formula to form calculation configuration and to calculate using standard flow unit. Afterwards, the small flow measurement signals can be removed rationally for obtaining accurate flow calculation data. The application of the flow compensation calculation configuration can create favorable conditions for safe and stable operation of the unit.
Calculation of running resistance of pipe belt conveyor in straight segment and bended segment
YUE Xinxi
2014, 36(9): 19-20.
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Abstract:The resistance analysis models of pipe belt conveyor in straight segment and bended segment were established, and the force on the conveyor was analyzed. The resistance calculation formulas for straight segment and bended segment were deduced, which can be used as reference for engineering technicians in design of pipe belt conveyor.
Strengthening and correcting scheme of highvoltage power line tower in minedout area of fully mechanized topcoal caving face of coal mine
MENG Xianglong, LIU Yu
2014, 36(9): 21-23.
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Abstract:The safe operation of the highvoltage power transmission line above minedout area of the coal mine fullymechanized topcoal caving face is threatened and damaged by the mining. The influence of the ground deformation of the minedout area on the power transmission steel tower was studied in detail. Based on this, referring to domestic and overseas treatment scheme of highvoltage power line tower strengthening in minedout area, a strengthening and correcting scheme of highvoltage power line tower on the minedout area of fully mechanized topcoal caving face was proposed. The scheme had been implemented, and better result was obtained.
Influence of variation of primary air pressure on combustion of east Junggar coal
WANG Yi1, LI Peng2, ZENG Qi2, ZHANG Dade2, YU Liyang2
2014, 36(9): 24-26.
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Abstract:Taking the 350MW coalfired boiler of selfsupply power plant of Xinjiang Xinte Energy Company Limited as research object, the site experiment was expounded. The temperature distribution in furnace during experiment process was recorded, and the influence of the variation of primary air pressure on boiler combustion and coking was analyzed. Based on this, the target of this paper is to find the law of the influence of primary air pressure on east Junggar coal combustion. The result of this paper can be used as reference for east Junggar coalfired power plant in selection of primary air pressure.
The processing technology for slewing tracks of largescale portal crane
NIU Wenxian, ZHANG Jingyong
2014, 36(9): 27-28.
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Abstract:Structure of the large and ultra large portal crane’s slewing track determine its manufacturing technique and the convenience of latter maintenance.The processing technique of a large portal crane’s large sized slewing track were studied.A new type of removable slewing track, making the processing were proposed, to go this slewing portal crane ease manufacture and maintenance.
Analysis on dynamic simulation experiment of circulating cooling water
WEN Xiaohong, CUI Shaobo
2014, 36(9): 29-31.
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Abstract:In Huadian International Zouxian Power Plant, the surface water and the city reclaimed water are used as supplementary water source of the circulating cooling water of two 1000MW units. According to the proportional relation of the supplementary water quantities of the two water sources, an antiscaling and corrosion dynamic simulation experiment was carried out, and more scientific and rational water quality control standard and optimal drug dosage were found.
Description of fuel management of thermal power enterprises in brief
WANG Yuchun
2014, 36(9): 32-33.
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Abstract:The fuel cost is always the main part of the total operation cost of a thermal power enterprise, and the fuel management becomes the priority among priorities of thermal power enterprise operation and management. The fuel basic management, the fuel purchase, the fuel planning and transport, the fuel checkout and storage were expounded separately, and the targeted management measures were proposed. The result of this paper can be used as reference for thermal power enterprises in fuel management.
Analysis on reasons of leakage of heating surface of power plant boiler and preventive measures
DONG Ruixin1,WU Chaofeng2,LI Hua1,LIU Hongqiang1
2014, 36(9): 34-36.
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Abstract:Some cases of boiler shutdown accident caused by leakage fault of water wall tubes of power plant boiler were described. Based on analysis, it was determined that the leakage fault of water wall tubes is caused due to soot blower fault. The steam source of the soot blower was reformed. The soot blower fault online monitoring device and the boiler soot blowing optimization monitoring device were installed additionally. The abnormal shutdown accident due to boiler heating surface leakage caused by soot blower fault was reduced, and the safety and economic efficiency of the unit operation were improved.
Analysis on reasons of fracture failure of main shaft of bucketwheel stackerreclaimer
FENG Yufeng
2014, 36(9): 37-39.
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Abstract:In the coal handling system of Inner Mongolia Datang Togtoh Power Generation Company Limited, an accident of main shaft fracture of the bucketwheel stackerreclaimer occurred suddenly. After urgent repairs, the accident had been controlled in minimum margin. Combining with site actual situation, the reasons of the main shaft fracture accident were analyzed in detail. The analysis result is useful for preventing similar accident.
Reformation of monitoring system lower position machine of Guangzhou Pumped Storage Hydropower Plant
CHEN Longxiang
2014, 36(9): 40-41.
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Abstract:The monitoring system lower position machine of Guangzhou PumpedStorage Hydropower Plant had been put into operation for more than 20 years. The parts for repair are not available. So it is necessary to upgrade and reform the lower position machine and to use new equipment and new technology to improve the equipment operation reliability. The reformation conditions were combed, the device types were selected, and the reformation process was designed. Then a set of reformation schemes was designed. To implement the schemes can solve a series of reformation problems, and meanwhile, as short as possible equipment stoppage time is needed.
Reformation of cooling water system of rollingcylinder type slag cooler of 440t/h CFB boiler
DUAN Jingwei1, LI Jiangang2, CHEN Chuanping1, LIU Junfeng3
2014, 36(9): 42-45.
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Abstract:In the cooling water system of boiler rollingcylinder type slag cooler of a thermal power company, the waste heat of the boiler slag was not recovered and reused effectively. The industrial water flux flowed through the slag cooler was larger. The temperature rise of the cooling water is larger. Aiming at above problems, in order to ensure the unit to operate safely, stably and economically, a cooling water system reformation scheme was proposed. The safety of the system design was verified by the pipeline hydraulic loss calculation. After the system reformed, the unit safety was improved further, and favorable economic benefit was obtained.
Differences between the GB standard and IEC standard about 6kV switchgear
JIANG Fangshuai, ZHOU Zhengyi, QI Yue
2014, 36(9): 46-48.
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Abstract:The International Electrotechnical Commission (IEC) standards is a very large system. The Chinese national standards(GB) about product and engineering are related with IEC standards closely. The IEC standard about 6kV switchgears and the matching breakers, which had been used in an oversea thermal power plant project, was compared with corresponding GB standard, and the matters needing attention in application of the two standards were expounded.
Analysis on reasons of decreasing of condenser vacuum degree and treatment
CAO Ye
2014, 36(9): 49-50.
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Abstract:The condenser vacuum degree of the unit No.1 in Huilai Power Plant of Guangdong Yudean Group decreased. The system was investigated and analyzed, and it was determined that the factors influencing on the condenser vacuum degree are the temperature of the vacuum pump working liquid, the opening of the adjust valve of backwater of feed pump mechanical sealing water, the leakage of the hole on the condenser wall, through which the oil discharge pipe of the bearing box passes, and so on. The relevant treatment measures were adopted, and the condenser vacuum degree returned to normal value. The safety and the economic efficiency of the unit operation were improved.
Antiabrasion measures for Brazil high ash content coalfired boiler
SHI Guoliang1, KANG Lili1, ZHANG Haiyong2
2014, 36(9): 51-52.
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Abstract:In a 350MW coalfired power plant in Brazil, the fired coal is of high ash content and large abrasion index. So the boiler heating surface abrasion and leakage faults occurred. Aiming at above problem, some measures, such as to control velocity of flue gas, to install antiabrasion devices, to adjust operation mode and so on, were adopted. The abrasion and leakage faults of the boiler were controlled effectively.
Application of FRP pipes in seafloor water supply and drainage engineering of thermal power plant
ZHOU Zhengyi
2014, 36(9): 53-55.
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Abstract:The material characteristics and the economic efficiencies of the filament wound FRP pipe and the concrete box culvert were compared. The advantages of the seafloor water supply and drainage engineering of an oversea thermal power plant, in which the FRP pipes were used, were illustrated. The construction scheme of the FRP pipe was introduced in detail, and the key points and the innovations of the technology were summarized.
Reformation and function simulation of protective device of PCV
LI Xinjian
2014, 36(9): 56-57.
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Abstract:The usage conditions of the pressure control valves of two 670MW units in Huadian Weifang Power Generation Company Limited were introduced. The problem of PCV malfunction was pointed out, and the reformation scheme was put forward. Using the virtual distributed process unit (DPU) of Xinhua distributed processing system (XDPS), the function of reformed PCV protective device was simulated.
Analysis on reasons of boiler feed frontmounted pump motor overload and treatment
WANG Qiang
2014, 36(9): 58-59.
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Abstract:In operation of the boiler feed frontmounted pump of a power plant, a motor overload fault occurred.The reasons of the motor overload fault were analyzed.The reformation scheme of the boiler feed frontmounted pump was proposed.The scheme had been implemented, and better result was obtained.
Analysis on accident prevention method for live working in 10kV power distribution line
CHEN Shuguo，LIN Deshan
2014, 36(9): 62.
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Abstract:The habitual violation of regulation in live working in 10kV power distribution line often occurred. In order to ensure the working site safety and completely eradicate personal injury, taking the line parts of power grid safety regulations as main reference, the reasons and the process of accidents in live working were analyzed, and the method to avoid accident was given.
Examination key points of pollutant total emission reduction in coalfired power plant and matters needing attention
HAN Meiling
2014, 36(9): 62-63.
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Abstract:According to the accumulated experiences of total emission reduction examination over the years, respectively starting from four aspects, which are the material examination, the flue gas automatic monitoring examination, the distributed control system examination and the emission reduction devices site examination, the key points of the emission reduction examination and the matters needing attention were introduced.
Research on rational configuration of combined cooling heating and power distributed energy system
CHEN Linxin
2014, 36(9): 64-67.
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Abstract:The expected goals of the gasfired combined cooling heating and power distributed energy system (DES/CCHP) are to reduce primary energy resource consumption, to raise the efficiency of energy utilization and to obtain better economic benefit. In order to achieve the goals, the rational configuration of the combined cooling heating and power distributed energy system (DES/CCHP) and equipments was researched, and the energysaving performance and the economic benefit of the system were analyzed. Some concrete suggestions were proposed for reader’s reference.
Research on optimized design of photovoltaic array of largescale photovoltaic power station
ZHOU Changyou1, SUN Wei2, ZHU Guofeng2
2014, 36(9): 68-72.
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Abstract:The experiences of photovoltaic power station construction were introduced. The best tilt angle and the economical optimal tilt angle of photovoltaic array design were expounded. The optimized design method of photovoltaic array of largescale photovoltaic power station was researched. The feasibility to adopt lowtemperature and lowsolar irradiance condition in calculation of module string design was analyzed. Based on this, an optimized design scheme of the array spaces in southnorth direction and in eastwest direction and the supports was proposed.
Engineering application of low resistance grounding system of current collection line in wind farm
HU Sen, ZHANG Lei, CHENG Lei, YANG Fei
2014, 36(9): 73-76.
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Abstract:The advantages and disadvantages of the low resistance grounding mode were analyzed. The several common low resistance grounding modes were described. The protection configuration scheme of main electric equipments of the current collection line and the setting principle of the protection were expounded. Aiming at common problems in engineering application, relevant countermeasures were proposed, and the further research direction was prospected.
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