Integrated Intelligent Energy

Research and application of positive pressure dense phase ash pneumatic conveying system based on stable transportation flow field

SU Fuqiang;JIANG Wenwen;GUO Liang;WANG Yong

2010, 32(2): 1-3.

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Aiming at the higher energy consumption and serious pipeline wear of pneumatic ash conveying system of large thermal power unit, the reasons were analyzed. According to the relation between the flow characteristics of gassolid twophase fluid and its stable transportation flow field, a novel multipump micro positive pressure dense phase pneumatic ash conveying system was designed. The system had been researched and tested in a 600MW unit, and the test result shows that the designed system can reduce the energy consumption and weaken the pipe wear.

Application of coordinated optimal control system in 480t/h circulating fluidized bed boiler

ZHU Xuecun

2010, 32(2): 4-6.

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The CFB boiler combustion automaton control of Inner Mongolia Huadian Wuda Thermo Power Generation Corporation Limited was difficult to put in operation normally due to the complexity and the particularity of CFB boiler combustion. By using the control software CFB boiler combustion process optimal control system, the combustion automatic control for 480t/h level CFB boiler was realized. Based on this, the unit coordinated control was realized.

Principle of measurement of rotor expansion in S109FA unit and location analysis

ZHANG Haoliang

2010, 32(2): 7-9.

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The turbine rotor expansion of GE S109FA class singleshaft gas turbine unit was measured by dual sensor. In the MK VI control system, the rotor expansion measurement and calculation module was protected by three stages password, and this level password was not provided to users. This makes great troubles for thermal technician in maintenance of rotor expansion measurement system. By using collected various technical materials of rotor expansion measurement, combining with field installation and maintenance experiences, the working principle of the calculating module was extrapolated. The result can be used as reference for thermal technicians in installation, debug and location of rotor expansion measurement system of same type equipment.

Optimization of air and flue gas system of CFB boiler

WANG Yingdong;SUN Yong;Lü Hongqi;GUO Xinhai

2010, 32(2): 10-13.

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In order to prevent coking of boiler (mainly high temperature coking), it is necessary to keep higher primary air flow. But the surplus capacity of primary air fan selected by design institute may be too larger to cause larger house service consumption rate. Simultaneously, the application of the high pressure fan can cause larger airheater leakage factor. The house service consumption rate of large CFB unit is commonly about 10%, and this is main factor restricting largescalization of CFB unit. The air and flue gas system of boiler was optimized, some necessary reformation measures were adopted. Then the house service consumption rate had been reduced by 1.62%, and good result was obtained.

Design factors affecting water balance of limestonegypsum wet flue gas desulphurization system

ZHONG Shanxia;ZHANG Yuming;SHEN Yuhui

2010, 32(2): 14-15.

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The water balance of limestonegypsum wet flue gas desulphurization system and its absorption tower was calculated according to different design conditions. The analyzing thought and affecting factors of water balance in design process were analyzed, and a reference for relevant design was provided.

Research of long shaft system stability of ultra supercritical turbogenerator

HE Xinjiang;LI Xiangling;SUN Shouyi

2010, 32(2): 16-21.

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The total length of shaft system of 1000MW ultra supercritical turbogenerator in Huadian International Zouxian Power Plant is 54.652m, and the stability of the shaft system had been tested by too large shaft length. In order to verify the stability of unit shaft system, the load dump test, the oil temperature changing test and the vacuum changing test were down and a series of test data was analyzed, and the stability of the unit shaft was ensured. The results provide reference for optimal design of turbogenerator shaft system.

Design features of twoway gantry crane for dam intake tower in the Three Gorges Underground Power Station

SI Jianwei

2010, 32(2): 22-25.

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The main technical parameters and their selection of 3500/1000/100kN twoway gantry crane for dam intake tower in the Three Gorges Underground Power Station were introduced; the main design features of main hoisting and slewing crane were discoursed; the selection of seven working conditions of three dimensional finite elements calculation for the frame was discussed and the calculation results were given.

Design and analysis of slagoff machine in an ammonia synthesis project with annual production of 500 kilotons

WANG Haitao;GUO Shilei

2010, 32(2): 26-28.

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The composition and structure of slagoff machine for gasgenerating apparatus were introduced. The operation process of the apparatus was discussed. The design and calculation methods of the volume of the slagoff machine, the maximum chain tension of the slagoff machine and the motor power were given, and the technical characteristics of the slagoff machine were summarized.

Study on improving measures for pulverized coal distribution evenness

ZHANG Huxiang

2010, 32(2): 29-30.

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Good results have been obtained after reforming the pulverized coal system of #11 boiler in Wangting Power Plant. The maximum deviation of air and coal powder in deferent layer was less than ±10%, which is favorable for the balance of flue gas flow from two sides of furnace outlets, implementation of low NOx emission and steady combustion in boiler lowload. Now flue gas temperature deviations between two sides before hightemperature reheater are controlled in 15℃. No blockage in pulverized coal pipe, no overtemperature tubebursting and other bad phenomenon have been occurred until now, and unburned carbon content in the fly ash has decreased year by year.

Problems needing attention in installation of damper preventing air blast in coupling

LIU Zhonghua

2010, 32(2): 31-33.

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The damper preventing air blast of coupling of 600 MW domestic units, which was newly installed or newly overhauled, was often fall off in trial operation, and this has an adverse effect on safety operation of unit. Some typical accidents were enumerated and analyzed, and the problems needing attention in installation of the damper preventing air blast in coupling were pointed out to avoid similar accident.

Influence of excessive steam turbine blade tip seal clearance on the unit economical efficiency

FENG Renhai;NI Ding

2010, 32(2): 34-36.

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The variation of turbine blade tip seal clearance will influence on the tip steam leakage and reduce the unit economical efficiency. Based on structure data of a 200MW reheating condensing steam turbine of Inner Mongolia Huadian Zhuozi Power Generation Corporation Limited, by calculation of characteristics of thermodynamic process, the influence of the amount of steam leakage on unit thermal economical performance was determined, which can be used as basis for unit reformation decision.

Problems in operation of 300MW CFB boiler and solving methods

LIU Yanpeng;SUN Zuping

2010, 32(2): 37-39.

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The problems occurred during commission and train run of 300MW CFB unit in Huaibei Linhuan Joinlion Power Generation Corporation Limited were introduced, which included the lower resistance of the air distributor, the easy jam of the bed lances, the damage of expansion joints of induct burner, the fault of the coal feeding system, the problems of adding bed material in coldstate experiment and slag leakage of external heat exchanger, and the jam of peat gun. The following ways were used to solve the abovementioned problems, such as strictly controlling the particle size distribution of coal, ventilating the bed lances with compressed air when they were stopped, cooling the expansion joints of induct burners by water, controlling the moisture content of coal in the lower range, installing tube below the wind chamber of external heat exchangers and manually adding water according to the outlet pressure of the peat guns. By the above means, the problems were solved.

Analysis of single auxiliary operation mode for high capacity unit operating in low load condition

ZHAO Junbin

2010, 32(2): 40-41.

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The unit of Shanxi Zhangshan Power Generation Corporation Limited operated in low load condition in long term, and the efficiency of its auxiliary was lower and the house service consumption rate was higher. Aiming this situation, an energy conservation operation experiment was accomplished, in which single feed pump, single primary induced/forced draft fan, two boiler circulation pumps and two mills were put into operation. The effective energysaving measures were adopted, and obvious energysaving effect was obtained.

Analysis of oil leakage fault of oil level indicator in oilimpregnated paper condenser transformer bushing and treatment method

ZHAO Jun

2010, 32(2): 42-43.

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The concrete reasons of oil leakage fault of single round glass oil level indicator in highvoltage oilimpregnated paper condenser bushing for start & standby auxiliary transformer of 1000MW unit of Huaneng Haimen Power Plant project phase I were described in brief. According to analysis, the oil leakage fault eliminating methods were put forward which can be used as reference for similar fault treatment.

Cause analysis of doublestages axialflow primary fan blades drifting

QIAN Hongxiang

2010, 32(2): 44-45.

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The causes of stall and surge of axialflow fan during practical operating were analyzed, and the reasons of blade drifting of double stages axialflow primary fan of 600MW unit in operation were discussed. The problems needing attention in overhaul were pointed out, and relevant solving measures were given.

Centralized monitoring network scheme and configuration for auxiliary shop of largescale thermal power unit

XIAO Changge;HU Shanyun;YANG Yuhong

2010, 32(2): 46-50.

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The control level of auxiliary shops of largescale thermal power unit and various monitoring scheme were discoursed, and the problems existing in auxiliary shop centralized monitoring network system were discussed. Several key technologies restricting the auxiliary shop monitoring network system were analyzed in detail. Combining with Guodian Feixian Power Plant phase I project (2×600MW supercritical units), the monitoring plan and configuration scheme of auxiliary shop centralized monitoring network system of largescale thermal power unit based on industrial Ethernet were provided.

Reformation of flow path of 300MW domestic unit manufactured using introduced technique

DUAN Yongcheng

2010, 32(2): 51-53.

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The faults of lower efficiency of HP casing and larger steam leakage were often occurred in domestic 300MW unit manufactured using introduced technique, and the economical efficiency of unit operation had been influenced. A reformation scheme of flow path of 300MW unit was introduced, in which the combinations of Brandon steam gland and honeycomb gland was adopted. The performance data of the unit before and after reformation were compared each other, and the conclusion obtained is that using newstyle gland rationally can improve the unit performance.

Analysis of closing faults of butterfly valves and treatment method

LIN Chengfa;SU Yijian

2010, 32(2): 54-56.

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In some hydropower stations in which the butterfly valves are closed by themselves using heavy punch, the butterfly valves often can not closed fully after operating several years. The problem was analyzed, and a reliable automatic closing procedure of butterfly valve was proposed. The procedure can not only ensure normal closing of butterfly valve and provide safety guarantee for operation and overhaul of hydropower station, but also can protect the main shaft and bearing of butterfly valve and lengthen the service time of butterfly valve.

Reason of sealing oil pressure fluctuation and treatment

ZHANG Wenhui;ZHANG Shiqiang;SUN Hui

2010, 32(2): 57-59.

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The general situation of sealing oil system and the working principle of its main equipments were introduced. Based on this, the problem of oil pressure fluctuation occurred in operation of sealing oil system was described, and the cause of the problem was analyzed. The operation measures and overhaul measures were adopted respectively; then, the sealing oil pressure fluctuation was basically eliminated.

reatment of oil leakage of combination bearing in bulb tubulous turbine generation unit

ZHANG Wei

2010, 32(2): 60-62.

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The oil leakage faults of combination bearing of two bulb tubulous turbines were occurred in Chaozhou Water Supply Project, and safety production of the two units had been influenced seriously. The combination bearing had been disassembled. It was found that the gland packing was aged; and serious corrosion was occurred in the shaft of unit and thrust runner. The reasons of oil leakage of combination bearing were analyzed; some relevant treatment measures were adopted; and satisfactory effects were obtained.

Analysis of cracks in wheel blades of hydraulic turbine and strength enhancing

LIANG Wei

2010, 32(2): 63-66.

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The adding units of Wujiangdu Hydropower Plant were put in operation in 2004 in succession. It is first time found that the cracks were occurred in blades in overhaul period in 2007. The cracks were analyzed and treated, then the units were put in operation again, but the cracks were occurred frequently in some blades. In unit overhaul period in 2009, in the joint of trailing edge of blade and upper canopy of wheel blades of #1 hydraulic turbine, the angle steels were welded to enhance the strength. The dynamic balances of unit before and after the strength enhancing were compared and analyzed, and a basis for solving the problem of cracks in wheel blades was provided.

Reason analysis of shortconnectline differential protection malfunction trip and prevention measures

ZHANG Tailin

2010, 32(2): 67-68.

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The connection mode of 500kV system of a power plant was introduced, and the operation of the shortconnectline protection was presented too. The process of the malfunction trip fault of the shortconnectline protection and its reasons were analyzed, and some prevention measures were proposed.

Redundant power supply mode of UPS using directly parallel connecting plus automatic mutual throwing

LI Zhengkun;ZHANG Yan

2010, 32(2): 69-71.

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Two redundant configuration schemes of UPS were compared. Combining with the example of unit tripping caused by UPS fault in power plant and the successful reformation of UPS system, an optimal design scheme of UPS was proposed, in which the output of two UPS directly parallel connected into load, and each of them can be put in automatically. The scheme can ensure the reliability of power supply, and provides a reference for UPS system design and reformation in thermal power plant.

Energysaving reformation of induced draft fan and testing study of its performance

KONG Lingjun;WANG Kehua

2010, 32(2): 72-77.

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After #1 and #2 boilers of Huadian Qingdao Power Generation Corporation Limited putting into operation, the efficiency of induced draft fan was lower, and its energy consumption was higher all the while. In minor overhaul period at 2008, the #2 induced draft fan had been reformed by authorized Xian Thermal Power Research Institute. The test after reformation indicated that the efficiency of induced draft fan had been increased by 15%～20%, the energysaving effect was very obvious.

Adjustment of FGD operation and research of gypsum quality

GUO Haojie

2010, 32(2): 78-80.

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In limestone gypsum wet desulphurization system the de-SOx efficiency and gypsum quality were determined by the important parameters, such as limestone slurry concentration, pH, liquid/gas ratio, Ca/S ratio, and oxidation air pressure. Through the discussions on operation manners and parameters configuration, this article tried to find the optimal operation point in order to improve de-SOx efficiency and gypsum quality.

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