Integrated Intelligent Energy

Analysis and research on static deviation of the yaw system of wind turbines

2019, 41(7): 1-5.

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Static deviation is common in yaw control system of wind turbines,resulting in reduction of power generation efficiency and increase of low load.Based on the wind turbine operating data,an improved analysis and calculation method for discretized static deviation of yaw system based on data preprocessing is proposed. By analyzing the operating characteristics of the wind turbines,the operating data in the horizontally distributed interval of tip speed ratios during maximum wind power tracking are selected.And the static deviations of the yaw system are analyzed and calculated by comparing the power characteristics with different wind speed and yaw error intervals.Baesd on data measured by laser radarsonde,the effectiveness of the method can be tested,and the relationship between the static deviation of the yaw system and the impeller speed is established.More accurate analysis on static deviation of the yaw system can be made according to impeller speed.The application results in wind farms show that the proposed method can effectively and accurately analyze and calculate the static deviation of the yaw system.

Estimation method for exhaust gas flow and energy of gas internal combustion engine

TONG Hang，LI Guomin，WANG Baoyu，RUAN Huifeng，SUN Liang

2019, 41(7): 6-9.

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According to the limitations in measuring exhaust gas flow and energy,two estimation methods，namely carbon balance method and oxygen balance method，are introduced.Taking performance test results of a distributed energy internal combustion gas engine as example，all the factors influencing estimation precision are analyzed.The analysis shows that flue gas components，natural gas flow and CH4 content are the major influencing factors.Error of exhaust flow and exhaust energy estimated by carbon balance method is smaller than that by oxygen balance method with the same smoke component measurement error. 

Identification method and software design of testing failure report based on fault information system

LI Yiquan1，JIAO Shaolin1，ZENG Genghui1，LIU Wei1，TU Qingrui1，TAN Qian1，ZHAN Qingcai2

2019, 41(7): 10-14.

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During the operation of the power grid, network accessing tests may be made on protective relay devices of new substations everyday. The test data of the protective relay devices will be sent to the fault information system of dispatcher and generate fault report, as they act in a real fault. For dispatching operators, only the real fault report will be notified and those fault reports generated by field tests need to be effectively screened and filtered by fault information system. Therefore, it is very important to identify these fault reports by effective approaches instead of by dispatch operators. Four practical methods for eliminating test data which are judging by maintenance mark, judging by adjacent interval information, judging by information in the same interval and judging by primary auxiliary information, are put forward according to the field operation experience.The software developed upon these judging methods has been applied in a electric power dispatching company.Engineering practice shows that the power grid fault report recognition accuracy is greatly enhanced by the software.

Analysis on application effect of dust removal technology with high efficiency power supply

WANG Xiaohua，ZHANG Hai，HU Hanyu，ZHAN Jing

2019, 41(7): 15-17.

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In order to study the dust removal technology for the system with highefficiency power supply,the practical application of various highefficiency power supplies are analyzed.It is clarified that the dust removal technology with highefficiency power supply can improve the dust removal effect by improving the dust charge characteristics.At the same time,it is pointed out that high frequency power supply is more suitable for high resistance and high dust collection,pulse power supply and three phase power supply are more suitable for high resistance fine dust particles collection.Combining application of high efficiency power supply dust removal technology with other dust removal technologies can effectively realize the ultralow emission of dust. Therefore, the high efficiency power supply dust removal technology is a preferred technology route for ultralow emission.

Numerical simulation of flue gas flow field at the bag filter inlet of 1000MW boiler

WANG Lipeng，SHENG Ranran，AN Jingxue，CHENG Jinwu，WANG Lei

2019, 41(7): 18-23.

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The large deviation of the flue gas flow field uniformity at bag filter entrance in a domestic 1000MW ultrasupercritical oncethrough boiler leaded to the startup of its water spraying desuperheating system and affected its safe and efficient operation.The deflector was installed based on the numerical simulation and onsite test. After installation, the uniformity of the flue gas velocity and temperature at the bag filters entrances is improved obviously.

Design and application of twoway cleaning device for the head of belt conveyor

WANG Xiaobin

2019, 41(7): 24-26.

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The common belt conveyors head cleaner used in thermal power units have poor cleaning effect and limited application. By analyzing the structural characteristics and design defects of the head cleaners,a twoway cleaner with special cutter head,locking sleeve,compensation and retraction device is designed.The cleaner is of simple structure,convenient adjustment and good cleaning effect.

Experimental study of dissolved oxygen’s effect on dissolved hydrogen analyzer of the main steam

LI Haiyang，WANG Renlei，YOU Liangzhou，HENG Shiquan

2019, 41(7): 27-30.

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It is an effective method to monitor the high temperature oxidation rate of the inner wall of superheater and reheater tubes by using dissolved hydrogen analyzer to measure dissolved hydrogen content in main steam , which can warn the possible overheating or overheating deposit.However, it is found that in the actual operation, measurement accuracy of dissolved hydrogen analyzer is poor. The results of study show that the dissolved oxygen in water sample has obvious effect on the measurement of dissolved hydrogen. The smaller the dissolved hydrogen is, the more dissolved oxygen contains，and the greater the relative error of dissolved hydrogen analyzer makes. On the other hand, when the dissolved hydrogen content is constant, the actual value of the dissolved hydrogen analyzer has a linear relationship with the dissolved oxygen content.Therefore, dissolved oxygen may be an important factor affecting the measurement of dissolved hydrogen analyzer.

Derating and efficiency optimization operation of wind turbines running above cutout wind speed

HU Xiangtao，ZHANG Jinlei，XIANG Zongyuan

2019, 41(7): 31-33.

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Through the research on the derating and efficiency improvement of wind turbines, it is safe and feasible to reduce the output of the wind turbines with a cutoff wind speed higher than the designed speed to an extend.This method not only improves the power generation efficiency of the wind turbine itself, and also contributes to the continued stability of ongrid wind farms.

Brief analysis on the advanced work of EPC design for foreign wind power projects

HU Sen，YUAN Jing

2019, 41(7): 34-36.

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In view of the unfavorable factors such as the tight schedule, harsh contract terms, complicated boundary conditions and localized procurement of L wind power project in Thailand, the procurement team and the design team are required to communicate at any time, which asks for bringing forward the designing. In the process of onsite designing in Thailand, the traditional design pattern shows a lot of incompatibility.Through the sincere cooperation with the project management team, drawing on scientific management methods, we actively improved the design process, and adjusted the communication methods with all parties involved in the project. Finally, the wind turbines were put into operation in December 2017. The research can provide a reference for the design of similar EPC projects.

Design and optimization of villagelevel PV poverty alleviation power station in Inner Mongolia Autonomous Region

WANG Ming

2019, 41(7): 37-29.

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The rationality of the design of villagelevel PV poverty alleviation power stations directly affects the generation capacity, system security and return on investment of power generation systems. Taking the Xilingol League villagelevel PV poverty alleviation power station in Inner Mongolia Autonomous Region as the research object,it analyzes the site selection, PV string, grid connection scheme, fence and fire prevention optimization design of villagelevel PV power station in remote grassland area, which can be used as reference for system optimization of other PV poverty alleviation power plants.

Energysaving transformation of vacuum pump in 660MW steam turbine generator set 

JIN Wei

2019, 41(7): 40-42.

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With the improvement of national energy conservation and emission reduction requirements, power companies urgently need to transform the equipment with high energy consumption to improve the economy. In order to improve the operating efficiency of the vacuum pump in No.4 unit, Wangting Power Generation Branch of Jiangsu Huadian Energy Company Limited connects the lowpower 3stage variable frequency regulation Roots vacuum pump and the liquid ring pump in series, which forms an intelligent speedregulating mechanical vacuum pump unit. The liquid ring pumps are arranged side by side. The actual operation shows that the highefficiency vacuum pump set can realize intelligent speed regulation and can maintain or even improve the vacuum degree of the condenser in operation. After the transformation, the unit can save electricity consumption and coal consumption which are worth 1.249 million yuan a year in total. In the same year, the transformation cost can be recovered, and the economic benefits are very significant.

Water balance test and watersaving recommendations for gasfired power plants

ZHANG Zhiguo1，DENG Ruixia2，HAO Tongjie2

2019, 41(7): 43-45.

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Thermal power plants take water resources as the key to their production and development, so do the gasfired plants.In order to understand the status quo of water usage, look for water saving potential, and find out watersaving priorities, a water balance test is carried out in a gasfired power station for zero emissions research. Analyzing the water balance test results, watersaving measures are put forwarded, which is of energy saving and environmental significance.

Cause analysis and solution for tube burst in highpressure superheater of NG-M701F-R heat recovery boiler

ZHANG Junwei

2019, 41(7): 46-49.

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There were several tube bursts in the highpressure superheater of NG-M701F-R heat recovery boiler during its initial operation,which seriously affected the safety of the unit.Cause analysis is conducted from operation mode，desuperheating water，welding，structure and exhaust gas of the unit.It is convinced that periodic thermal stress，overrange desuperheating water flow，poor welding quality，unreasonable structure of tube bundles and rotating exhaust gas flow are the main reasons. By optimizing operation mode of the unit，strengthening management of highpressure superheater maintenance，adding compensation bend，reinforcing the antivibration bracket and installing antivibration beam, tube in the highpressure can be protected from burst.

Scale analysis and comprehensive treatment of condenser stainless steel tubes

QIAN Xilin

2019, 41(7): 50-53.

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Condenser scaling is a common problem of circulating water treatment in power plants.The scaling of condenser will seriously affect the condensation effect,increase the terminal temperature difference and decrease the vacuum degrees,which affects the output of units,and coal consumption for power supply.Analyzing condenser scaling by monitoring the operation status and inspecting the internal condition of condensers in a company,causes for scaling are given.In view of the reasons,comprehensive treatment such as physical cleaning and dosing recirculating water are formulated.Removing the scaling of condenser and effectively mitigating the process of scaling can improve the vacuum of condenser,which provides guarantee for the longterm effective and efficient operation of condenser and generator set.

Study on manufacturing technology of large diameter doublespoke pulley

LU Yongya1，LI Hangyu2，JIN Long1

2019, 41(7): 54-57.

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Taking pulleys on the Silin ship lift as the research object， the manufacturing routing of the large diameter doublespoke pulley is introduced in detail according to its structure characteristics.The key manufacturing processes that affect the performance of large diameter doublespoke pulleys,such as rope groove rolling,rope groove welding, postwelding stress removal and pulley machining,are analyzed and studied. The detection results of pulley residual stress show that the technology can effectively control the forming quality of pulleys, and vibration stress relief can effectively remove the pulley stress after welding, which provides an important basis for the application of large diameter doublespoke pulleys on the ship lift.

Discussion on operation and maintenance of hydrogencooling generator adsorption type hydrogen drying device

NIU Zhifeng，CHENG Tu

2019, 41(7): 58-60.

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The humidity of hydrogen in the hydrogencooling generator will directly affect the safety and economic operation of the generator.By analyzing and summarizing the abnormal conditions during the operation of the adsorption type hydrogen drying device in hydrogencooling generator,methods for ensuring the normal operation and handling the exceptions of the drying device are given,which can maintain the good operating state of the hydrogen drying device and controling the hydrogen humidity in the hydrogencooling generator.

Analyzing the existing problems and improvement scheme of suspended mechanical lifting beam

SHENG Ge1，GU Yuanquan2，WU Xiang2，LI Shuqi3

2019, 41(7): 61-63.

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The structure of a suspended mechanical lifting beam and its connection with the gate are introduced.The working principle of the mechanical lifting beam is explained.The shortcomings in the decoupling and hooking of the mechanical lifting beam,reasons for its frequent failure and the consequences of the accidents are demonstrated. A transformation scheme is provided which is replacing the mechanical lifting beam with hydraulic lifting beam.The working principle of gate hooking and decoupling with the aid of hydraulic lifting beam is mainly analyzed.Features and benefits of the replacement scheme are summarized, which provides an important basis and technical support for the optimization and transformations of mechanical lifting beams in the future.

Analysis and treatment of abnormal vibration of a steam turbine of 600MW unit

CHEN Xiao，XU Wei，LIU Li，CHEN Xin

2019, 41(7): 64-66.

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During the normal operation of No.2 unit in a power plant, there is unsteady intermittent vibration of steam turbine side No.2 bearing. Through the vibration data monitoring, the cause and mechanism of the abnormal vibration of the unit are analyzed. The abnormal vibration of the unit is caused by the intermittent rubbing due to the deposition carbonization on the oil battle. After cleaning the carbon deposit on the oil baffle, the vibration of the unit returns to normal.

Influence and analysis of water soluble paper on main steam quality

ZHOU Zhibin，CHANG Liang

2019, 41(7): 67-69.

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In order to prevent superheater tube burst caused by oxide coat peeling in a power generation company, pipe cutting inspection was carried out during unit overhaul.In the recovery process with argon arc welding, a special type of “instant watersoluble paper” was used to seal both ends of the weld in order to make the weld be protected by argon atmosphere.The hydrogen conductivity of the main steam of the unit repeatedly exceeded the standard after being connected to the grid.The main reason is that the superheater had not been washed sufficiently before the unit startup.The content of chloride and sulfate in the instant watersoluble paper is too high.The residual watersoluble paper continuously releases impurity ions such as chloride and sulfate after the unit startup.It is the main reason for the abnormal high hydrogen conductivity of main steam.Preventive measures are put forward to ensure that the quality of main steam reaches the standard.

Reasons analysis for tube blasting and preventive measures for superheater of 1000MW supercritical boiler

WANG Xueli

2019, 41(7): 70-72.

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For a 1000MW ultrasupercritical boiler after ignition and gridconnected to full load in a plant, there was a leakage accident due to the blasting pipe in high temperature superheater. Through metallographic examination, cause analysis and orifice inspectation, the reason for the tube burst in high temperature superheater is determined and relevant countermeasure is made, which has certain reference and guiding significance for the same type supercritical boiler in preventing tube bust and safe operation.

Application of mobile sonic soot blowers in economizer of 660MW boiler

XING Jun1，HE Chao1，SHU Zhongping2

2019, 41(7): 73-76.

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Traditional soot blowing method of economizers generally adopts high temperature steam as power for soot blowing which is directly purged on heat exchange elements.Its coverage is limited,soot blowing effect is poor,and the maintenance cost is high.The serious ash deposition on heat exchange tubes of economizer will quickly deteriorate the heat transfer effect.The boiler exhaust temperature will gradually increase and its thermal efficiency will be greatly reduced.The smoke resistance will also increase, which lead to high power consumption of induced draft fan.For the serious jamming problem of ash depositionin power planst,a new type of mobile sonic soot blower is adopted and the sootblowing effect is significantly improved.The economizer operation parameters are more superior than that with steam sootblowers alone.It solves the problems of poor soot blowing performance of the steam soot blower, corrosion and blow loss of the heat exchange elements.

Cause analysis and preventive measures of abnormal regulation of AGC in a power plant

YANG Yuzhu，XU Wei

2019, 41(7): 77-79.

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There is abnormal load regulation of AGC due to the disparity between power plant side and dispatching side parameter.Through the AGC data transmission, command algorithm, numerical conversion and adjustment mode analysis, the cause of abnormal load regulation is confirmed.Briefing from safety technical measures, parameter setting, command verification, test verification and process management ,specific preventive measures are proposed for AGC parameter adjustments that could lead to abnormal load regulation.It could provide reference for adjustment of AGC abnormal regulation and operation maintenance.

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