Integrated Intelligent Energy

An optimization multiple objective model of distributed coolingheatingpower supply

HUANG Delian

2014, 36(2): 1-3.

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Abstract:The general condition of combined cooling, heating and power(CCHP) system were discussed, for the production process and how the energy transformation was go deep into analyzed. Based on this, individual researches about the correlations between relation operation parameters and several features such as energy utilize rate and demand balance of supply and demand, economy, and need; an multiple objective optimization model was putted, the coordinate and optimization of balance between the three objectives of energy supply and demand balance, economy, and energy utilize rate were achieved.

Application of flue gas condensing technology in gasfired distributed energy system for removing water mist in chimney

HE Binbin, XU Jingjing, LI Heping, SONG Hongtao

2014, 36(2): 4-7.

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Abstract:Taking the Huadian Industry Park Energy Station project as example, the flue gas condensing technology for removing water mist in chimney was discussed. The type selection and arrangement form of the flue gas condensing heat exchanger were analyzed. The economic analysis result shows that the equipment investment can be returned in 6.37 years. Under the condition of stable waste heat users, by using this technology, the problems of deep utilization of flue gas waste heat and chimney visual pollution can be solved.

The application of domestic elastic metal plastic tile in 600MW hydropower units

WANG Guilai, YI Jilin

2014, 36(2): 8-12.

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Abstract:Elastic metalplastics tile of large hydroelectric generating set excel then superior to imported Babbitt alloy sliding bearing in terms of friction power loss, selfadjusting ability, heat resistance, load capacity, pv value and the insulation properties; it has been the good qualities such as large safety margin, high loadcarrying capacity, long useful life and low price. For the purpose of propelling the localization of giant hydraulic turbine and break the foreign countries' monopolization of its key technology, Goupitan Power Plant technicians was based on a lot of researches and innovatively ,have a try at it application elastic metalplastics tile with thrust load capacity as large as 30000kN.After 4 years operation the result make known,when thrust load amount to 30000kN application of domestic elastic metal plastic tile,that hydroelectric unit has feature of operation stability,safety and reliability.

Energy save transformation of closed cooling system of 330MW steam turbine unit in Yangzhou Power Plant

SHI Zhengsheng, YUAN Kaixiang, JI Yayun, JI Jianyu

2014, 36(2): 13-15.

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Abstract:In order to study the water consumption of the closed cooling system for the 330MW unit under different seasons，the operation conditions of closed cooling water system in the whole year 2012 Jiangsu Huadian Yangzhou Power Generation Corporation Limited were analyzed. Based on the features and selection principle of the closed cooling pump, the economy of small pump instead of the original large pump were analyzed . The energy saving plan of adding a small pump in closed cooling water system to reduce the system energy consumption were advanced. Transformation results showed :suitable small pumps can reduce energy consumption of closed cooling water system and the system is running in good condition.

Treatment and case analysis of high power consumption rate in Harbin Third Power Plant

WANG Chuansheng

2014, 36(2): 16-17.

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Abstract:Take #3 unit of Harbin Third Power Plant of Huadian Energy Corporation Limited as an example, the reason of high power consumption rate were analyzed,the influencing factor of power consumption rate were discussed. After take the measures of targeted adjustment and technical transformation, the power consumption rate of #3 unit were clear decreased.

Analysis and calculation of electrical geometric model

LIU Lei

2014, 36(2): 18-21.

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Abstract:The principle and specific calculation method of electrical geometric model were introduced, the exposure distances of all varieties of electrical geometric structure were discussed in categories. Based on this, electrical geometric model was adopted to calculate shielding failure tripout rate of the circuit, and the result was compared with that calculated by order method. According to data derived though the operation, calculations of electrical geometric model are more reliable.

Analysis on debugging technology of direct aircooled unit of power plant

ZHANG Juncheng

2014, 36(2): 22-26.

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Abstract:In debugging and commissioning process of the direct aircooled unit, the problems in design, installation and operation of the unit were exposed gradually. The problems of the aircooled unit, such as the thermal system design, the air cooling island flushing, the aircooled unit starting, the freezeproofing of air cooling island in winter and the influences of strong wind and high temperature, were analyzed. The idea and method to solve the problems were explored actively to ensure safe and stable operation of the direct aircooled unit.

Influence of cutting highpressure heater system off on unit thermal economy performance under variable operating conditions

LEI Tianpeng 1, JIA Jinchan 1, CHAI Guoxu 2

2014, 36(2): 27-29.

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Abstract:Based on the theory of variable operating conditions of steam turbine, the variation of the thermal economy performance indexes of the steam turbine unit after the HP heater had been cut off was analyzed. According to the amplitude of the index variation, the influence of cutting the HP heater off on economic efficiency was estimated. After the HP heater was cut off, the heat rate of the unit increases obviously, the cycle thermal efficiency of the system decreases, and the gross coal consumption rate increases. For more long time the HP heater is stopped, the caused economic loss is more obvious.

Analysis and calculation of kilowatthour data error caused by incorrect voltage loop wiring of kilowatthour meter

HUANG Donglan

2014, 36(2): 30-32.

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Abstract:The measurement principle of kilowatthour meter was introduced. The relation between the true active power and the incorrect meterdisplayed active power caused by incorrect voltage loop wiring of kilowatthour meter was analyzed, and according to this relation, the kilowatthour data error was calculated. Various incorrect voltage loop wiring forms of the kilowatthour meter were analyzed. It was pointed out that the adopted calculation method of the kilowatthour data error must be suitable to the voltage loop wiring form of the kilowatthour meter and practical load condition.

Evaluation of uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method

ZHAO Zhixiang, WU Suozhen, TAI Wenfang

2014, 36(2): 33-35.

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Abstract:The uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method was evaluated. According to the files CNAS-GL06—2066 “Guidance on Evaluating the Uncertainty in Chemical Analysis” and JJF 1135—2005 “Evaluation of Uncertainty in Chemical Analysis Measurement”, the sources of the uncertainty during whole measurement process were analyzed. Each component of the uncertainty was calculated, and the expanded uncertainty on the measurement result was obtained. When the mass fraction of iron in water sample is 3.67μg/L, the expanded uncertainty is 0.16μg/L.In the various uncertainty components, the uncertainty brought by using the regression equation to calculate the iron content has largest influence, so it is necessary to control the related coefficients of the regression equation well. The influence of the digestion and volume calibration process on the uncertainty is very little and can be neglected.

Variable frequency energysaving reformation of water circulating pump in heat supply network of 300MW cogeneration unit

MA Yanxin

2014, 36(2): 36-38.

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Abstract:The composition of the heat supply network system of 300MW cogeneration unit was introduced. The problems happened in operation of water circulating pump in heat supply network were analyzed. A variable frequency energysaving reformation scheme for the water circulating pump in heat supply network was put forward. The total water supply flow of the heat supply network was regulated by the regulating valve installed in outlet of the water circulating pump originally; and in the reformation scheme the total water flow will be regulated by the reformed water circulating pump directly. After the scheme was implemented, the operation and maintenance cost of the unit was decreased; the heat supply safety factor of the heat supply network was increased; the economic benefit and the social effect of the enterprise were enhanced.

Analysis on defects of oil pump for the oil pressure equipment system of Huanglongtan Hydropower Plant and treatment

DENG Chenghong, CAI Xinwu, LI Mingsheng, PENG Jun

2014, 36(2): 39-39.

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Abstract:In the operation of the oil pump No.1 of oil pressure equipment system in the waterturbine generator set No.3 of Huanglongtan Hydropower Plant, the oil pump operated abnormally with large sound, which is serious threat for safe and stable operation of the unit. According to the fault phenomenon, the installation process, the equipment, the skill of the operators and the use of the materials were analyzed, and the oil pump was repaired for eliminating its defects. After the repair, the waterturbine generator set operates safely，the desired result were achieved.

Power flow calculation of power grid based on SSSC

ZHAO Lina

2014, 36(2): 40-43.

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Abstract:Based on the static model of synchronous static series compensator (SSSC), the influence of SSSC on power grid was translated into the equivalent injected power on the nodes. The relation between the node injected power and SSSC control parameters was deduced. According to given power control target, new state equation was established, and a power flow calculation method for power grid containing SSSC under condition of given power control target was proposed. In the calculation process of the method, it is not needed to modify the original grid node admittance matrix. Based on original grid power flow equation, the new state variables were selected, and the influence of SSSC on the power grid was transferred to the amendment of the power flow equation. The effectiveness of the method was verified by practical example.

Optimization of maintenance method for heating surface of boiler stopped as standby for long term

ZHANG Hejing

2014, 36(2): 44-47.

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Abstract:The well maintenance of the inside of boiler, which was stopped as standby for long term, is the basic premise for ensuring safe and economic operation of the boiler. The corrosion is important factor to shorten the service life of the boiler stopped as standby for long term. Taking the boiler optimized maintenance method of Fujian Huadian Shaowu Power Generation Company Limited as example, the reasons and the damages of boiler corrosion were analyzed, and the advantages and the disadvantages of various maintenance methods were analyzed. The analysis results are useful for safe and economic maintenance of the boiler.

Management measures for preventing leakage of heating surface tubes of boiler

LI Peng

2014, 36(2): 48-50.

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Abstract:Aiming at the problems of fracture and leakage of the heating surface tubes of the water wall, the superheater, the reheater and the economizer of the boiler, starting from the view of management, the preventive measures were proposed to prevent the leakage accident of the heating surface tubes of the boiler.

Diagnosis and analysis on abnormal steam extraction parameters of a 600MW supercritical unit

XU Xing, HUANG Qilong, DAI Weibao

2014, 36(2): 51-52.

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Abstract:A 600MW unit operates continuously for two years, and its HP steam extraction parameters deviated from the design value seriously. So the heat consumption rate of the unit increased greatly, which influenced on safe and economic operation of the unit vastly. By means of comparison of the operation data and the performance test results of the unit in different periods, considering the main steam flow, the operation parameters of the heaters and the variation of the pressure ratio of stages, the reasons of the abnormal HP steam extraction parameters were analyzed. The conclusion of the analysis is that there is scale formation in the flow path of the HP cylinder, and it was suggested to open the cylinder for maintenance. The result in this paper can be used as reference for safe operation and maintenance of steam turbine.

Reformation of fanshaped plate gap control system for air preheater

WANG Fangdong, WANG Jie

2014, 36(2): 53-54.

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Abstract:A part of air preheater control equipments of boiler No.5 in Huadian International Zouxian Power Plant was damaged, which caused that the gap control system can not be put into operation normally, the air leakage increased, and the boiler efficiency was affected. The fanshaped plate gap control system was reformed and brought into DCS to realize centralized control. After the reformation, the radial air leakage of the air preheater had been controlled effectively.

The operation tactics of 670MW supercritical oncethrough boiler under AGC (R) pattern

CHEN Wei, SUN Guoyi

2014, 36(2): 55-56.

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Abstract:When the 670MW supercritical unit of Huadian Weifang Power Generation Company Limited operated under AGC(R) pattern, the larger fluctuation of the unit load leaded the unit parameters to be unstable, and the unit had to exit from AGC(R) pattern frequently. Aiming at this problem, the possible reasons were analyzed, and some targeted measures, such as to control intermediate point temperature, to adjust the coal quantity in ignition stage and last stage of load variation and so on, were adopted. So the operational reliability and economic efficiency of large unit under AGC(R) pattern were improved.

Analysis on reason of gradually increasing of acid consumption in positive ion exchanger and treatment

CAO Deping

2014, 36(2): 57-59.

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Abstract:Taking the treatment of high acid consumption incident of Hunan Huadian Changsha Power Generation Company Limited as example, the factors, which may leading to acid consumption increasing, such as the source water quality, the resin quality, the resin quantity, the pollution, the equipment factors, the acid quality, the regeneration parameter control, the water temperature and others, were analyzed term by term. Aiming at different influencing factors, different treatment measures were adopted, and obvious result was obtained.

Variable frequency reformation of primary air fan and optimization of RB function

ZHU Zhijun

2014, 36(2): 60-62.

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Abstract:Taking the newbuilt 300MW unit of a heat and power company in Dandong as example, the defects of the primary air fan, such as high energy consumption and large noise, were analyzed. The thermal control strategy was optimized, and the variable frequency automatic adjustment function was perfected. So the energy consumption and the noise were reduced, and the safety, reliability and the economic efficiency of the unit were improved.

Analysis on reason of suddenly decreasing of oil pressure in lubricating oil system of small turbine in 300MW unit and treatment

ZHENG Xiaohong

2014, 36(2): 63-64.

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Abstract:Taking the Huadian International Shiliquan Power Plant as example, the function of the small turbine lubrication oil system was introduced. The reasons of the incident of the small turbine shutdown caused by suddenly decreasing of the small turbine lubrication oil pressure were analyzed. The small turbine lubrication oil system was reformed, and the hidden trouble of the suddenly decreasing of the small turbine lubrication oil pressure was eliminated.

Analysis on fracture of axial flow fan blade in air cooling island of direct aircooled unit

ZHOU Kai

2014, 36(2): 65-68.

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Abstract:Taking the 600MW direct aircooled unit as example, the reasons of abnormal fracture of axial flow fan blade in air cooling island were analyzed. The measures for preventing blade fracture were proposed, which can be used as reference for similar steam turbine in installation of axial flow fan blade in the air cooling island.

Analysis on reasons causing dissolved oxygen in condensate water of 1000MW unit to exceed standard and control measures

QU Haiying, SUN Lei

2014, 36(2): 69-72.

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Abstract:In practical operation of the 1000MW unit of Huadian International Zhouxian Power Plant, the dissolved oxygen in condensate water exceeded standard. The factors influencing on the dissolved oxygen in the condensate water, such as the condensate water make up model, the return water temperature of feed pump sealing water, the output of the vacuum pump and the mechanical seal of the condensate pump, were analyzed. The comprehensive control measures were put forward, and the safe and economical operation of the unit was ensured.

Application of incentive mechanism through practical management in the wind power enterprise

QI Fang, BAO Jinchun

2014, 36(2): 73-74.

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Abstract:In order to rise the efficiency management and enhance the management mechanism of the enterprise, the theoretical foundation of incentive mechanism from the angle of psychotherapy were expounded.Lay down variable salary system，respecting employees, concerning subordinates, fostering humanbased concept, meeting the needs of employees by involving them into management and achieving their selfworth are effective means of enterprise management were point out. These measures used in wind power enterprise, fine effect of positive motivation were obtained.

Analysis on reasons of high fault rate of wind power generator collecting ring and countermeasures

LI Peng, YAO Junbing, BI Xiaoying

2014, 36(2): 75-77.

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Abstract:Aiming at the too high fault rate of collecting ring of wind power generator in a wind farm, the statistical result of the faults was analyzed, and based on this analysis, it was determined that the main reason of the faults is shortcircuit fault by carbon powder, and to reduce the carbon powder accumulation can reduce the fault rate of shortcircuit caused by carbon powder. It was proposed to add carbon powder cleaning device in the collecting ring chamber. After the measure was implemented, the fault rate reduced from 3.17 times per month to zero.

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