Integrated Intelligent Energy

Progress in intermediate and high temperature SOFC/MGT combined power generation technology

HU Xiaofu，WANG Yang，TIAN Li，SU Junhua，GENG Xuan，SHEN Jianyong，ZHANG Nanji

2019, 41(8): 1-5.

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New combined power generation systems including intermediate and high temperature solid oxide fuel cells(SOFC), and micro gas turbines(MGT) are highefficient, environmentalprotective, and lowcost, which is promising in distributed power generation. We introduced the working principle of SOFC/MGT combined power generation system, and focused on the SOFC/MGT combined power generation system driven by naturegas. We summarized the application of SOFC/MGT combined power generation system, and expected its development.

Comparison of DLN1.0+ and LEC-NextGen combustion system

DING Yang，LIU Zhimin，XU Tingting

2019, 41(8): 6-10.

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The design features of DLN1.0+ and LEC-NextGen combustion systems for gas turbines newly developed by GE and PSM are compared.The design methods of the two combustion systems in improving fuel premixing uniformity, reducing flame temperature, improving cooling efficiency, reducing flow loss and reducing contact surface wear were analyzed.NOx mass concentration discharged by either combustor above is less than half of that discharged by DLN1.0 combustor, and the maintenance interval is doubled or tripled. The CO mass concentration discharged by LEC-NextGen combustor is lower than 1.25mg/m3.

Research on update interval optimization model of gas turbine inlet filtration system

BAI Yunshan，TIAN Xin，LIU Zhimin

2019, 41(8): 11-14.

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As a shield to block harmful particles,air inlet system plays an important role in safe and economic operation of gas turbine.With increment of operating time, the pressure loss of inlet system increases.Researching update interval of the inlet filtration system from the economy is of realistic importance.Major factors and computing method for the replacement cost of multistage filtration system are discussed,and an optimization model for the update interval of multistage inlet filtration system is proposed on the purpose of minimizing the replacement cost per unit of power generation.Update intervals for coarse filters and fine filters of a gas turbine inlet system are optimized,and the result shows that the filter replacement cost per unit of power generation is 1.2% lower.Finally,effects of gas price and initial cost of filtration system on the optimal update interval of multistage filtration system and replacement cost per unit of power generation are discussed,which are significant for deciding the inlet filtration update interval.

Model selection and installation of coupling for the LM series aeroderivative gas turbine generator

MAO Yangjun

2019, 41(8): 15-19.

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M aeroderivative gas turbine generator (referred to as LM generator) has extremely high requirements on alignment accuracy. Therefore, there are corresponding technical requirements for the coupling.On one hand, it is necessary to find proper couplings according to their models and performances. On the other hand, the prestretching installation process of the diaphragm coupling must be taken seriously. Taking the coldcentering of an LM6000 gas turbine in a Shunde project as an example, the influence of the incorrect installation process on the coupling and even the entire LM unit was analyzed. In order to avoid the impact of improper operation on the diaphragm coupling, the prestretching installation steps must be strictly followed and the inspection before and during installation must be strengthened.

Development and application of intelligent production management system for gas distributed power station

DIAO Peibin1，DENG Yanan2

2019, 41(8): 20-23.

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Energy shortage and environmental problems impel the development of gas distributed power stations. Safe operation is the key to energy stations. But manuscript and paper records are still prevailing in daily work，which makes data analysis difficult,and leaves a lot of work to production management.An intelligent production management system,based on the characteristics of gas distributed power stations and intelligent technology,are proposed to be applied in gas distributed power station.The system includes 3 subsystems which are intelligent maintenance management system，intelligent operation system and intelligent troubleshooting system. It can effectively supervise power stations，guide their daily work，and setup a large database for power stations.

Cause analysis and solution for ignition failure of V94.3A gas turbine

SONG Xin

2019, 41(8): 24-26.

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There are frequent failures in startup and ignition process of a V94.3A gas turbine in a gasfired power plant. By analyzing its operating data, it is found out that high ambient humidity and poor draining effect of diffusion combustion natural gas pipelines will affect the the ignition of units.Effective drainage measures must be taken during the operation, before the shutdown and during the maintenance of the unit, which effectively improves the success rate of the unit ignition.

Deep neural network modeling on power curve based on multivariable selection

XIE Jiaying，GUO Peng

2019, 41(8): 27-31.

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A wind turbine power curve can reflect the generating capacity of a unit. Power curve modeling based on historical data is significant to the operation and management of wind farms.The partial least squares (PLS) method is introduced to analyze the correlation between multiple variables and output power of units on data layer. The crossvalidity principle and the variable importance in projection (VIP) are used in dimension reduction screening for multiple variables.The subset of optimal variables is used as the input to the deep neural network (DNN), from which the DNN model of the power curve is obtained. Taking the data of a wind turbine in an Anhui wind farm as an example, the effectiveness of the proposed method is verified by comparing it with other modeling methods.

Optimization research on deflectors installed in rightangle bend tube with rectangular section

WANG Zhoujun1,2，LI Xinghua2，TANG Lijun1，DUAN Quansheng2

2019, 41(8): 32-37.

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In order to improve the flow field uniformity in a rightangle bent tube with rectangular section, the fluid flow in the elbow was numerically simulated by FLUENT software. The effects of the uniformity of flow field and local resistance and energy loss in the elbow were analyzed by using different quantities and structures of flow deflectors. The results show that the velocity distribution is not uniform, vortex and secondary flow occurs when the flow deflectors are not installed in the elbow, while the uniformity of flow field can be effectively improved after arranging the deflector plates; using a reasonable number of baffles can not only effectively improve the flow field uniformity and completely eliminate the vortex and secondary flow caused by the rightangle elbow, but also greatly reduce the flow resistance and energy loss. Through the numerical simulation analysis of the deflectors of three different design schemes, the optimal number and structure of the deflectors are obtained.

Field test, analysis and recommendations for injection stator grounding protection

ZHU Yucong，BAO Minglei，LI Yuping，SANG Jianbin，LI Ming

2019, 41(8): 38-43.

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Taking the field test of injection stator grounding protection of a 1008MW steam turbine generator set in a power plant as an example,combining its protection principle,methods for the influencing factors of accuracy, phase compensation test,impedance compensation test,parallel resistance compensation test,resistivity correction factor test and dynamic simulation test are introduced in detail.At the same time,suggested setting values for grounding zerosequence current and the loop monitoring are given.The error of the test data is below 5%, which verifies the rationality of compensation tests.In addition, targeted approach for loop inspection are give for solving anomalies in 20Hz voltage signal,20Hz current signal,phase angle difference and grounding resistance during the field test.Analysis on failure startup of the injection stator grounding protection,blocking during startstop process,multiphase angle compensation and the influence on synchronous and speed measuring device are made.And the recommendations for action delay setting,frequency blocking, timing for multiphase angle compensation and synchronous voltage selection are made.

Study on the grid connection adaptability of large capacity nuclear power units in Hainan

CHENG Tianle，WANG Shanli

2019, 41(8): 44-48.

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Based on the operation of Hainan power grid,the impact of grid connection of large capacity nuclear power units on Hainan power grid is studied from medium and longterm grid structure, power market space, peak load regulation, system safety and stability, shortcircuit current, investment economy and so on.The research shows that the coordinated 500kV grid meets the demand of large capacity nuclear power units, but it impacts the Hainan power system.The relevant suggestions put forward can be used as a references for planning and operation of Hainan power system in the future.

Design and dynamic simulation of openingclosing mechanism of material bin gate

FENG Yu1，ZHAO Jinke1，ZHAO Xuerui2，ZHAO Yaoli2

2019, 41(8): 49-52.

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A traditional material bin requires a large opening space for its gate, which affects the designing height. If the fourbar mechanism is used as the tandem for openingclosing mechanism,the demanding space for the opening will be greatly reduced. Taking the gate openingclosing mechanism of a dust collecting bin as an example, it is verified by kinematics simulation that the openingclosing mechanism can reduce the opening space, and the motion principle and dynamics characteristics of the mechanism are obtained through dynamic simulation.The effectiveness of the openingclosing mechanism is proved by static simulation.

Experimental study on electrochemical technology for circulating water treatment in thermal power plant

ZHANG Aijun1，JIN Yinjia2，YU Jiang2，TANG Guorui2，WANG Fengji2，JI Haihong2

2019, 41(8): 53-56.

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The effects of electrochemical technology on circulating water treatment system were studied. By comparison test,we find electrochemical equipment can effectively decrease the hardness and COD of circulating water, and is great bactericide and algicide. It can also moderately reduce Cl- concentration, achieving a higher circulating water concentration multiples and significant water saving. Moreover, the electrochemical equipment can reduce the dose of sterilizing agent, scale inhibitor and corrosion inhibitor in circulating water treatment system, which can effectively reduce the cost of the system.

Existing problems and optimization solutions of denitration ammonia escape analyzer measurement technology 

MI Dakui，ZHANG Chuangen

2019, 41(8): 57-60.

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The problems existing in 2 common measurement technology of denitrification ammonia escape analyzer in thermal power plants are listed.The causes of the problems in laser spectroscopy and chemiluminescenc measurement technology are analyzed and 3 optimization solutions for the ammonia escape analyzer are proposed, which improves the reliability and accuracy of ammonia escape analyzer measurement technology.It has certain reference value for the selection,operation and maintenance of ammonia escape analyzer in the future.

Problems and countermeasures of environmental protection equipment after ultralow emission transformation

ZHU Xueping

2019, 41(8): 61-64.

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According to the requirements issued by Ministry of Environmental Protection, Development and Reform Commission and Energy Bureau, ultralow emission transformation on coalfired power plant was carried out. After transformation, there are circulating pump vibration, alloy tray fragmentation, partial blowoff of denitrification catalyst, abrasion and corrosion of lowlow temperature heat exchanger and frequent failures of dust collector in desulfurization and denitrification dust collector system. Problems in desulfurization and denitrification devices,lowlow temperature heat exchanger and dust collector after the transformation are listed.By analyzing, a reasonable location for suction end of circulating pump is added ,and an oxidation fan is put into use before the operation of desulfurization system to prevent the slurry clogging at exhaust gas nozzles.The countermeasures are provided for the reference of the industry peers, in order to improve the operation of environmental protection equipment and to meet the environmental requirements of ultralow emissions.

Necessity analysis of filtered containment venting system of nuclear reactor

LI Shengjie，WEN Liang

2019, 41(8): 65-69.

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If there is over pressure in containment of nuclear reactor after severe accident, filtered containment venting system (FCVS) can ensure the integrity of the containment by relief the pressure actively. Nevertheless, activating FCVS may result in radioactive substances releasing into the environment, and there are some safety risks in the system itself. Therefore, it is questionable whether the FCVS should be adopted.After investigating national and international regulations, standards, and applications of FCVS in different countries,the benefits and disadvantages of FCVS are studied.The feasibility of eliminating the FCVS is analyzed, and the conclusion and applicable conditions of eliminating are given. An alternative solution without venting is proposed.

Optimization of deep frequency conversion transformation for condensate pump in 1000MW secondary reheat unit

XU Jiang，LIANG Haishan，XUE Xiaoyu

2019, 41(8): 70-73.

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In order to fully exploit the energysaving potential in a condensate pump during frequency conversion operation of a 1000MW secondary reheating unit,it is pointed out that the main factor restricting the deep frequency conversion of condensate pump is the low sealing water pressure of team turbinedriven feedwater pump.By adding sealing water boost pumps the turbinedriven feedwater pum，the operation logic can be optimized.After the deep frequency conversion transformation for condensate pump,the opening degree of the deaerator water regulating valve further increases,throttling loss decreases,the current and rotation speed of condensate pump drops.Energy is saved effectively.

Cause analysis on the fillet weld cracking of the outlet header socket of hightemperature reheater

DENG Hui

2019, 41(8): 74-77.

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There was a crack on the fillet weld of the ventilation tube of the outlet header socket of a hightemperature reheater in a power plant which was found during maintenance.The tube cracked again and the steam leaked after 6000h ours operation since the tube patching.Though macroscopic examination,spectral examination,hardness test,metallographic examination and scanning electron microscopic analysis,reasons for the crack are found out to be the improper repair welding which cause incomplete fusion and and other welding defects.Unreasonable structure design makes the expansion of ventilation tube hampered by the enclosed wall.Weld on the outer surfaces cracks under stress,and the crack spreads along the fusion line to the heat affected zone.It is suggested that the whole socket should be rewelded as soon as possible and the perforation structure of ventilation tube should be optimized.

Analysis and treatment of abnormal vibration of industrial water pump

LU Dingkang，ZHOU Wei

2019, 41(8): 78-80.

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The vibration of an industrial water system pump in a power station within gas turbines can not be completely solved after repeated maintenance.After malfunction elimination step by step,the cause of the pump vibration is considered to be the system.Through analysis, the power frequency pump flow and the abundance for the head is oversize,which is not suitable for the soaring of instantaneous flow.It is the main cause of the vibration.The measure of cutting blade disks of power frequency pumps is taken to reduce the outlet pressure and flow.After the transformation,the pump vibration meets the standard requirements and the power frequency pump current decreases,which achieves the purpose of energy saving.

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