Integrated Intelligent Energy

Technical solution of capacity expansion reformation for wet FGD system

XU Bin;TAO Aiping;LIU Xiaolei

2012, 34(4): 1-6.

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Taking the capacity expansion reformation of a limestonegypsum wet FGD system in a 600MW coalfired power plant as example, a reformation scheme of desulphurization system under the conditions of limited construction site and use old main equipments was introduced. After the reformation, when the high sulfur coal is burned, the emission can satisfy the requirement of relevant standard. The reformation technical solution can be used as reference for similar unit reformation.

Comparative analysis on selective catalytic reduction deNOx equipments with and without standby catalyst layer in coalfired power plant

WANG Gang;HUANG Rui;CHEN Fuguo

2012, 34(4): 7-9.

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The technical difficulty of deNOx system reformation project of coalfired power plant is larger, and its project cost is higher; so it was considered to cancel the standby catalyst layer in deNOx equipment. Based on comparative analysis of two management and operation modes of catalyst, which are ‘2+1’ and ‘2+0’, it was found that to cancel the standby catalyst layer can reduce project technical difficulties and the project cost, but it will increase the operation cost. The comparative analysis of deNOx equipments with and without standby catalyst layer can provide certain guidance and foundation for deNOx system reformation projects in planning and design stages.

Scheme of removing bypass dampers in wet FGD system and implementation

GUO Haojie;YU Zhongyong;HU Long

2012, 34(4): 10-12.

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In the unit No.14 of Wangting Power Plant, the bypass dampers of the limestonegypsum wet FGD system had been removed. The removing scheme and implementation process of the bypass dampers were introduced. The problems existing in startup, shutdown and operation process of the FGD system without bypass dampers were expounded; and targeted solution was proposed.

Study on fracture toughness test of SUMITEN 950-TMCP highstrength steel welded joint

LEI Qinghua

2012, 34(4): 13-17.

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Based on the fracture toughness test of the SUMITEN 950-TMCP highstrength steel welded joint, the CTOD (Crack Tip Opening Displacement) values of the parent metal, the welded seam and the heataffected zone were measured respectively; and the fracture toughness values of the various zones of the joint were compared. According to the test data, the antifracture performance of the steel and the welded joint was analyzed. Combining with the impact toughness test and the blast test data of the scale model bifurcated pipe, the eligibility criteria of the fracture toughness for highstrength steel was discussed. Some conditions satisfied with the steel used in hydropower project was proposed.

Optimized design and schemes comparison of station auxiliary power system for 600MW level units

DING Yimin;CHENG Lin;DING Zhuyuan

2012, 34(4): 18-22.

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The optimized design of novel station auxiliary power system for the 600MW unit of a power plant was introduced. Design schemes have been analyzed and compared ，and the scheme suitable for the practical situation of the power plant had been selected finally.
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Study on thermal control design of air cooling system of thermal power plant

CHEN Junli;SHAO Yiming

2012, 34(4): 23-25.

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The general situation of the air cooling system was introduced. The design features of the air cooling system of 2×600MW unit in a power plant were analyzed. And then the structure and the function of the air cooling system, the configuration and selection of the instruments and control equipments, and the network structure of the monitoring system were expounded in detail.

Influence of air fan 88VG on vibration of bearing No.3 of S109FA unit

NIU Zhifeng;ZHANG Ping

2012, 34(4): 26-27.

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The problem of bearing No.3 vibration in the S109FA unit manufactured by GE existed generally in operation of the domestic power plants. The features of the bearing No.3 vibration in operation of the S109FA unit in Jiangsu Huadian Qishuyan Power Generation Company Limited were analyzed. According to the analysis, a conclusion was reached that under certain conditions, the alternation of air fans 88VG may cause unstable vibration of the bearing No.3，and it is expected that the result is helpful for solving the problem of the bearing No.3 vibration.

Optimized operation of belt dewatering system

SU Junhua;SHEN Yuhui;JIN Yingshan;REN Zhen

2012, 34(4): 29-30.

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In the limestonegypsum wet FGD system of the 300MW unit of Hubei Huadian Huangshi Power Generation Company Limited, the experiment of operation frequency of the vacuum belt dewaterer had been carried out; and the influences of the operation parameters of the belt dewaterer on the energy consumption, the vacuum and the water content of the gypsum were obtained. According to the research results, ensuring that the water content of gypsum can satisfy the requirement of relevant standard, the operation parameters of the dewatering system were adjusted, so the energy consumption of the dewatering system reduced to minimum.

Operation mode optimization for water circulating system of 670MW unit

WANG Bin;ZHENG Tao;LIU Zunping

2012, 34(4): 31-34.

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In a power generation company, some researches and tests were carried out for changing the operation mode of the circulating water system of two 670MW units over from the unit system to the expanded unit system. Based on the thermodynamic test, the switching operating point which can make the condenser to operate in best back pressure was found. So the goal of economy and energy conservation was achieved. 

Fault analysis and treatment of adjustment mechanism of adjustable movableblade axial flow fan

LIN Xing

2012, 34(4): 35-38.

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The abnormal situation of the movableblade adjustment of the adjustable movableblade axial flow forced draft fan and primary air fan in a 600MW unit boiler at long time operation was introduced. The fault phenomenon of the movableblade adjustment mechanism was analyzed and treated, and the practical feasible preventive measures were summarized, which can be used as reference for similar fan operation.

Preventive measures of ‘four pipes’ leakage of boiler

WANG Xiaoli

2012, 34(4): 39-41.

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In the installation and commissioning operation of the 1900t/h supercritical boiler of unit No.5 in Pingdingshan Yaomeng Power Plant, the ‘four pipes’ leakage was prevented successfully. Taking this project as example, the quality control in installation process, the operation control strategy in period of the whole unit starting up and the problems occurred in early operation period were analyzed, which provides certain reference for similar units.

Realization of automatic oil feeding for stable combustion in supercritical unit

LI Xinjian;SANG Changyong

2012, 34(4): 42-44.

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The oil feeding situations of supercritical unit under different load conditions (the runback is excepted.) were analyzed. According to practical situation, the judgment signal of ‘accident trip’ of the coal mill and the frequency converter were perfected. Grasping the accident omens of the fire extinction and faults of auxiliary devices, the automatic oil feeding for combustion supporting was realized; so the combustion of the boiler was stabilized effectively, the unit power generation was ensured, and the disturbance of the unit on the power grid was decreased.

Analysis on reasons of higher mass fraction of combustible matter in fly ash of flue gas of coalfired boiler and countermeasures

HUANG Yanzhang

2012, 34(4): 45-46.

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The mass fraction of the combustible matter in fly ash greatly influences on the economic efficiency of the coalfired unit. In the heat loss of the boiler, the heat loss caused by mechanically incomplete combustion is about 2% and only less than the heat loss caused by the exhaust flue gas. Since the 420t/h boiler of a power plant in Guizhou was put into operation, the mass fraction of combustible matter in the fly ash is always higher. According to analysis, the reasons of the higher mass fraction of combustible matter in fly ash were found. The boiler equipments were reformed, and the combustion in the boiler was adjusted. So the mass fraction of the combustible matter in fly ash had been decreased greatly; and favorable economic benefit was obtained.

Analysis on reason of burning loss of rotor slip ring in 300MW generator

CHEN Lizhi;DONG Wei;LIU Dehui

2012, 34(4): 47-49.

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The reason of burning loss of the rotor slip ring in the 300MW generator was analyzed. The improvement suggestion for twopoint earthed fault protection of the generator rotor was offered; and some response measures for preventing the burning loss of rotor slip ring in the 300MW generator were given.

Tinyoil ignition reformation of 600MW supercritical unit

WU Qiang

2012, 34(4): 50-52.

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The tinyoil ignition system reformation had been accomplished in a power plant. The application situations of the tinyoil ignition system in the cold start, the hot start and lowload stable combustion operation of the boiler were introduced. Based on the reformation and the establishment of the management system for the boiler optimized combustion and blended coal burning, the favorable economic benefit was obtained.

Analysis and treatment of abnormal operation of bus

WEN Bisheng

2012, 34(4): 53-55.

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The busbar is main device to constitute the main electric connection of the power plants and substations; and the fault of busbar will lead the power outage in part or whole of the station. The reasons of common faults of the busbar were analyzed; and the relevant treatment methods were given, which can be used as reference for operation and maintenance of the busbar.

Analysis on reason of damage of deexcitation resistor in excitation system

CHEN Wei;LIN Fei

2012, 34(4): 56-57.

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Since the unit No.1 of Huadian Fujian Shaxian Chengguan Hydropower Company Limited was put into operation, the deexcitation resistor was damaged first time. Aiming at the happened problem, the reason of the fault was analyzed. Using the exclusive method, it was diagnosed that the fault is deexcitation resistor failure preliminarily. After the deexcitation resistor was replaced by new one, the unit operates normally.

Analysis on reason of refusing to act of electromagnetic valve in emergency tripping system of steam turbine

WANG Jianghong

2012, 34(4): 58-59.

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In a 600MW unit, the electromagnetic valve refused to act, which caused that the pressure of fireresistant oil could not relieve, and the steam turbine could not stop，and this brings potential safety hazard for unit reliable operation. Considering the quality of the fireresistant oil, the daily operation of the equipments and other factors, the reasons of the fault were analyzed. The accident treatment method was given. So the emergency tripping system can act reliably, and safe operation of the unit was ensured.

Application of highvoltage variable frequency technology in energysaving reformation of condensate pump of 1000MW unit

LIU Hongyu;WANG Liying;ZONG Yanxia

2012, 34(4): 60-63.

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Aiming at the requirement of energysaving and consumption reducing for modern large thermal power units, in the Huadian International Zouxian Power Plant, the variable frequency speed regulation reformation of two condensate pumps of the 1000MW unit was carried out. The control scheme of water level in the deaerator using variable frequency adjustment technology was introduced, and the control of the water level in deaerator was optimized. The reformed system operates reliably; and the energysaving effect of the reformation is obvious. 

Detection and analysis of energy consumption of air compressor

BAI Xueli;AN Huiyong;LI Libo

2012, 34(4): 64-66.

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Based on the calculation and comparison of operation cost of the air compressor, the importance and the necessity of the energy conservation for the air compressor were explained. The specific power was used as an indicator to measure the performance of the air compressor, and the energy consumption of the air compressor was detected and analyzed to evaluate its performance. Based on this， the operation mode and the maintenance plan could be arranged rationally, then the energy consumption aim will be achieved further.

Research on application mode of gridtied microgrid matchable with wind farm

LI Qiangqiang

2012, 34(4): 67-70.

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The application of the microgrid in wind farm can reduce the service power rate of the wind farm and ensure the reliability of the power supply effectively, which is of realistic significance for the safe, stable, economical and efficient operation of the wind farm. The feasible application scheme of the microgrid was introduced. Based on the comparison and analysis, the optimal microgrid application mode was determined finally, that is the wind power generation as the main power source and the fuel cells as the auxiliary one.

Settings matching up method for wind turbine generator system after connecting into 110kV grid

MA Yuling;;LIU Baozhu;LIAO Hongtao

2012, 34(4): 71-72.

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After the wind farms with low voltage ride through (LVRT) capability are connected into power system, in the settings calculation of the farms, it is unable to consider the wind farms as a simple load system. Taking the settings calculation of a wind farm connected into 110kV system as example, the factors, which must be taken into account in settings calculation, were analyzed; and a settings matching up method, for inside of the wind farm and the tieline with large power grid, was proposed.

Design of simulating testing system for main control system of wind turbine generator system

YU Lianxi;ZHANG Jinhuan;ZHAO Jing

2012, 34(4): 73-75.

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Aiming at the difficulties that the main control system of wind turbine generator system is short of effective testing method at present，a design method of a simulating testing system for main control system of wind turbine generator system was proposed, in which the computer technology and the communication technology are combined. The principle, the software design and the test mode of the testing system were introduced. Using the developed testing system, the quality problems of the wind turbine's main control system in development period can be found out correctly, quickly and all sidedly, which is useful for development and test of the wind turbine's main control system.

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