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Table of Content
25 November 2014, Volume 36 Issue 11
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Operation practice of desulphurization system after flue gas bypass had been dismantled
ZHAO Xinpu, XING Hao
2014, 36(11): 1-3.
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Abstract:Along with the environmental requirement becomes more and more strict, to dismantle the flue gas bypass becomes a new research topic. Taking the Luohe Power Generation Company Limited as example, the significance of demolition of flue gas bypass in limestonegypsum wet desulphurization system was analyzed. The feasibility of the desulphurization system logical control scheme before and after demolition of the bypass was expounded. The result in this paper can be used as reference for handling with similar problems.
Equipment reformation and operation optimization of desulphurization system after bypass is cancelled in power plant
GUI Dongbo
2014, 36(11): 4-6.
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Abstract:There are some risks in unit operation after the desulphurization bypass of the unit was cancelled. The risks were analyzed. Some measures of the logic optimization, the operation optimization and the equipment reformation were adopted. After the system had been reformed, the operation reliability of the desulphurization system was improved, and the operation period of the desulphurization system is suitable for the repair cycle of the unit.
Application of technology of planting steel bar on basis in denitration system reformation
LIANG Zhigang
2014, 36(11): 7-9.
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Abstract:In the old units of thermal power plants, the installation site was not reserved for flue gas denitration equipment. The original basis can not satisfy the strength requirement of the denitration equipment. Taking the denitration reformation project of the 2×300MW unit of Shanxi Zhangshan Power Generation Company Limited Phase I as research object, the basis planting steel bar and strengthening scheme, the technical requirements and the construction technology were summarized and analyzed. The equipment safety was ensured, and the reformation was accomplished successfully.
Optimization and realization of runback logic of main machine
YAO Xiujuan
2014, 36(11): 10-12.
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Abstract:After the bypass damper of unit No.1 of Huadian International Zouxian Power Plant had been cancelled, a runback logic for main machine when the booster fan failed and tripped was designed. The main function of the runback logic is that after the booster fan failed and tripped, the runback logic will act, the unit will execute a series action automatically to reduce the unit load, the relevant mill exhauster will trip, the fuel feed will decrease, the target load of the unit will be reduced, will be put into furnace to help combustion. Then the fan and the whole unit can operate safely.
Study on optimization of control strategy of furnace pressure control system
SU Chen, WANG Wenlan, ZHANG Jiahui, FENG Yongxiang
2014, 36(11): 13-16.
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Abstract:Aiming at the unstable furnace pressure, an optimized control strategy of furnace pressure control system was proposed. In the control strategy, the variable gain control is used to enhance the deviation restraining ability of the system and minimize the fluctuation of the furnace negative pressure; meanwhile, a furnace pressure override control is added to fast reduce the movable blade angle of the induced graft fan to improve the furnace pressure condition. It was verified by the disturbance test and the test curves analysis that the optimized control strategy has some advantages, which include the strong antiinterference capability, the strong ability to adapt to variable condition and strong ability to follow the control goal. Comparing with conventional control strategy, the optimized control strategy has stronger adaptation and robustness.
Analysis on influence of frequency deviation on directional element
LI Yuping, WANG Sheng, RAO Jianbo, Yang Dong
2014, 36(11): 17-19.
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Abstract:The directional element is a major part of relay protection function elements. The memory voltage of directional element is used to ensure the right action during threephase outlet fault. Based on Fourier algorithm, the influence of the frequency deviation of the power system on amplitude and phase of the current and voltage were analyzed. The action features of the positive sequence directional element were discussed in depth. Aiming at the problems of memory voltage of directional element during fault occurrence of power system with frequency deviation, a rational solution was given.
The logical optimization for the soaring back pressure protection of 600MW direct air cooling unit
WANG Tiankun
2014, 36(11): 20-21.
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Abstract:The author put forward runback control strategy in order to resolve soaring back pressure of the 600MW direct air cooling unit.Back pressure protection logically system of 600MW subcritical direct aircooling unit were optimized, risks of environmental strong wind may generate hot air back flow above air cooling island and with soaring back pressure, direct aircooling unit may trip were reduced. In this way, the unit safe operation under hostile circumstances of high back pressure were ensured.
Development of management and evaluation system of production indexes of power plant
GUO Fan, MIAO Wei, LI Dongfeng
2014, 36(11): 22-24.
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Abstract:The general situation and the development background of the production indexes management and evaluation system of power plant were introduced. The functions and features of four modules of the system, which are the indexes evaluation module, the unit vacuum dynamic management module, the indexes early warning module and the fault data modification application module, were analyzed. The results of the system obtained after it put into operation were expounded.
Construction scheme of outstanding items of Q601 mechanical module of AP1000 project
LI Peng1, WEI Xiaobao2, BAI Lifeng1, LIU Pengfei1
2014, 36(11): 25-27.
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Abstract:The temporary location of the Q601 mechanical module of unit No.1 in Sanmen Nuclear Power Plant could not meet the requirements of the outstanding items construction. Aiming at above problem, various restriction factors in site were analyzed, and the module integral secondary shifting, lifting and fixing scheme of Q601 module before site outstanding items construction was developed. Meanwhile, according to the outstanding items condition of the module, the scheme of erecting scaffold for construction platform was decided, and the temporary support used for items lifting was designed. At last, the basic flow chart for construction of the outstanding items was expounded.
Application of cable tunnel automatic fireproofing technology in thermal power plant
BAI Aiping
2014, 36(11): 28-30.
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Abstract:The cable tunnel fire alarm and the fireproofing door technologies are already applied widely in industrial production. Aiming at larger difficulty in fire protection in underground cable tunnel, the system composition and the working principle of the cable tunnel automatic alarm and monitoring and automatic fireproofing door system were analyzed. The normally opened fireproofing door system, the multilayer cable tunnel temperature measuring and alarm system and the cable tunnel monitoring system were discussed. The cable tunnel fire automatic alarm and monitoring and automatic fireproofing door system of the thermal power plant was established preliminarily.
Application of cascade PLC Modbus communication optimization strategy in fire protection water system of hydropower station
WU Kai
2014, 36(11): 31-32.
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Abstract:In fire protection water system of hydropower station, the traditional communication scheme is Modbus communication including one master station and multiple slave stations, and there is serious delay problem in this communication mode. A cascade PLC communication solution was proposed. The hardware and communication algorithm software were optimized and improved. The program period time of the central processing unit of PLC was decreased. The traffic rate and the response speed of the communication system were improved greatly.
Application of operator training simulator in power plant
ZHAO Li, FU Haihao, YANG Mingming, CHEN Liaoyuan
2014, 36(11): 33-36.
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Abstract:The development situation of the power plant operator training simulator (OTS) was introduced. The solution of power plant OTS was analyzed. Taking the 2×300MW unit of a power plant in Xinjiang as example, combining with specific situations, the application of OTS was illustrated.
Hight increasing design of tower structure of FZQ600 attached selfraising tower crane
LI Wei, ZHANG Qian
2014, 36(11): 37-39.
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Abstract:The tower structural composition of FZQ600 attached selfraising tower crane was introduced. The force conditions of the tower under attached state were expounded. Using ALGOR software, the finite analysis for hight increasing design of the tower structure of FZQ600 attached selfraising tower crane was done, and the stress of the tower and the adhesive forces in each adhesive layer were given. The safety of the tower crane in use by users was ensured.
Factors causing higher exhaust gas temperature of boiler and treatment measures
ZOU Shaobo, WANG Renli
2014, 36(11): 40-42.
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Abstract:In Shandong Century Electric Power Development Company Limited, the boiler exhaust gas temperature of unit No.5 is higher due to blended combustion of inferior coal in large percentages. The factors influencing on the exhaust gas temperature were analyzed one by one. The operation mode was adjusted, and the boiler exhaust gas temperature was reduced effectively. The boiler efficiency was improved.
Analysis on rejecting act accident of automatic bus transfer equipments in an 110kV substation and treatment measures
CHEN Hangsheng, ZHANG Guoping, CHEN Ping
2014, 36(11): 43-45.
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Abstract:In an 110kV substation, when the 110kV line failed and relevant beaker tripped, the automatic bus transfer equipments of the substation did not act, and related transformer and 110kV bus were cutout. Using the theoretical analysis and logic verification method, the accident was analyzed and discussed. The preventive measures in operation and maintenance were pointed out. The results in this paper provide reference for design and operation of the automatic bus transfer equipments.
Analysis on leakage of rear plate superheater tubes of boiler in a power plant
HAO Dongfu, LIU Hong
2014, 36(11): 46-47.
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Abstract:A tube crack accident of the boiler rear plate superheater in a power plant occurred. The macroscopic examination, the microstructure analysis and the thickness measurement of the oxide skin on internal wall were down for the cracked tube. Combining with the formation mechanism of the oxide skin, it was determined that the tube crack accident of the rear plate superheater is caused by overtemperature at long time and decreasing of the tube wall thickness. Based on the examination results of the rear plate superheater, the measures to ensure safe operation at long term were proposed.
Causes analysis and resolution methods for the declining resin regeneration in primary demineralize system
XUE Changgang, ZHOU Zhibin, WANG Fengtao, SUN Yong
2014, 36(11): 48-51.
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Abstract:As for the demineralize system of one stage 2 ×300MW unit′s boiler feed water resin regeneration begin to decline in primary demineralize a power plant.The possible causes were analyzed, the specific resolve methods were proposed.After actual implementation proved to be best effective.
Comparison of system configurations of Fclass gas turbines
ZHOU Yimin
2014, 36(11): 52-54.
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Abstract:The development situation of Fclass gas turbines was introduced. The technical parameters, the startup mode, the CO2 fire protection system, the antipant air vent valve, the oil system and the configuration of the burners of Fclass turbine series were analyzed. The differences of 6Fclass gas turbines and 9Fclass gas turbines in system configuration and operation were compared. There were relatively less 6Fclass gas turbines to be put into operation in china, the comparison and analysis in this paper may be helpful for operation of 6Fclass gas turbines.
Analysis on reasons of outoflimit vibration of water intake pump
HAN Lizheng
2014, 36(11): 55-57.
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Abstract:In operation of the water intake pump of a coalfired power plant, the vibration of the pump exceeded permitted limit. The reasons of the vibration were analyzed, and it was pointed out that the main reasons causing the overoflimit vibration are the external pipeline stress, the insufficient lubricating water pressure and the poor lubricating water quality. The faults were treated, the vibration of the water intake pump weakened, and the water intake pump operates normally.
Analysis on maintenance mode of heavyduty gas turbine
ZHENG Xiaoqing
2014, 36(11): 58-59.
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Abstract:Based on the execution situation of maintenance of Fclass gas turbine for seven years, according to the negotiation experiences of various maintenance mode clauses with manufacturers many times in recent period, the definition, the features, the differences and the liability scope of various maintenance modes of gas turbine were analyzed. The advantages and disadvantages of each maintenance mode were expounded. The results in this paper provide reference for the gas turbine maintainers to select the gas turbine maintenance mode.
Analysis on reasons of abnormity of deaerator water level control of 700MW steam turbine and treatment
WANG Jipeng
2014, 36(11): 60-61.
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Abstract:Taking the 2×700MW unit of a power plant as example, the principle of the deaerator water level control system and the control mode were introduced. Combining with the fault phenomenon, the reasons of the fault were analyzed, and concrete treatment measures were given. The ideal result was obtained.
Construction and practice of technology management system of ultralarge thermal power enterprises
YAN Yuhong1,2
2014, 36(11): 62-64.
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Abstract:The enterprises become main force of national technical innovation system, this is present inevitable trend. But the science research level of many stateowned large power enterprises is seriously deviates from their position, and it is necessary to establish a complete, scientific and effective technology management system for the enterprises to improve their science research level. Combining with the technology management practice of the Togtoh Power Company, the innovative establishment of technology management system for ultralarge thermal power enterprises was expounded. The successful experiences summarized in this paper can be used as reference for similar enterprises.
Reformation of control and measurement unit of coal feeder
LI Zhi
2014, 36(11): 65-65.
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Abstract:In Anhui Huadian Wuhu Power Generation Company Limited, the coal feeder and its control cabinet are assembled into an integer. During operation, the vibration of the coal feeder caused several faults of the control cabinet, which include the connection wire loosing, the board cards falling off, the board cards failure and the supply voltage fluctuation. The control cabinet had been separated from the coal feeder and installed in a better position. The faults of the control cabinet caused by vibration of the coal feeder were avoided. The tripping accident of the coal feeder was decreased. The equipments operate more safely and stably.
Experimental study on harmless treatment of fly ash formed in waste incineration
ZHAO Xiaofeng
2014, 36(11): 66-71.
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Abstract:A pharmacy prescription for stabilization treatment of waste incineration fly ash and matching technology were introduced. The treatment result of the technology can meet the admission demand specified in file GB 16889—2008 “Standard for Pollution Control on the Landfill Site of Municipal Solid Waste”. The chronic disease of larger heavy metal mass concentration of waste incineration fly ash in some domestic cities was solved by the pharmacy prescription, and the technology has stronger cost advantage.
Type selection and design of temporary combinedtype chimney for coalfired power plant
YANG Yawen1, ZHAO Weixing2
2014, 36(11): 72-74.
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Abstract:In FGD technical reformation project of coalfired power plant, the gasgas heater is eliminated, and the original chimney must be reformed for anticorrosion. So a temporary chimney is necessary to ensure the main machine to operate normally during the chimney anticorrosion reformation. Taking the technical reformation project of Huadian Baiyinhua Jinshan Power Generation Company Limited as example, a design method of combined type temporary chimney was introduced. The method of this paper provides a new idea for chimney anticorrosion reformation.
Application of “biological aerated filter + lime clarifier” technology in water treatment of power plant
YAN Caixia
2014, 36(11): 75-76.
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Abstract:The Huadian Baotou Hexi Power Plant uses the output water of the Baotou Southern Suburb Sewage Treatment Plant and the output water of the Advanced Treatment Station of the Baotou Steel Company as own water source. The treatment technology “Biological aerated filter + Lime clarifier + Vfilter” was adopted to treat the water, and the treated water was reused as supplementary water of circulating water. The fresh water resource was saved, and the contradiction of insufficient water resource was relieved. The economic benefit and social effect of the project are favorable.
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