Integrated Intelligent Energy

Flow field simulated research and practice of united denitration SCR system in coal fired power plant

ZHU Chenxi1, LI Weilin2, ZHENG Yingjiu1, SHEN Yuhui2, YANG Pengfei2

2015, 37(6): 1-4.

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Abstract:The fluid flowing characteristics of united SCR denitration system was reseached. With the help of the numerical simulation and phasical cold state model test, the flue gas flow field, the vilocity and temperature distribution and the pressure loss of the SCR denitration system under different conditions were calculated and verified. The research result of flow field simulation was used to guide the optimal design of SCR denitration system, and the denitration system operated in optimal condition. The result in this paper can be used as reference for reformation of denitration system in aged power unit.

Analysis of the operation characteristics of 330MW set′s SCR denitrification system SUI Xiukun

SUI Xiukun

2015, 37(6): 5-6.

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Abstract:With 330MW set in Jilin Jiangnan Thermal Power Company Limited as object case, the researcher studied the effect of selective catalytic reduction (SCR) based FGD deviceon boiler; then conducted check calculation on the boiler′s basic parameters, coal quality parameters and SCR de NO x system operation data, and the operation optimization measures of SCR de NOx system were proposed.

Cause analysis of traditional pyrolysis oven crystallization in de NOx system and the preventive measures

LI Haihao

2015, 37(6): 7-8.

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Abstract:In Huaneng Tongchuan Zhaojin Power Plant, the denitration system of unit No.1 showed a problem of pyrolysis boiler crystallization clog, after put into operation. Then reasons for the pyrolysis boiler crystallization were analyzed, the preventive measures for maintenance and monitoring were proposed, so that deNOx System′s safety and stability are ensured.

Research on stability problem of large power plant during power export

ZHANG Xinde1, XU Huang2, ZHOU Liangsong2

2015, 37(6): 9-12.

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Analysis and verification of application of electric power private exchanger in intelligent substation

ZHANG Wen, HAN Yue, LU Junzhi, LIU Tianxiang, WANG Longfei, CHENG Kejie

2015, 37(6): 13-17.

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Abstract:The synchronous data sampling and triping of the relay protection device must be independent on time synchronization system. The network sampling and the triping can not be used in intelligent substation due to random fluctuation of the network delay. The electric power private exchanger can control and calculate the delay time exactly, so it gives a technical direction to solve above difficulty. In appliation of the electric power private exchanger, according to the inherent delay of the intelligent substation merging unit (MU) and the total delay of the link circuit, the time of ocurrence of interval sampling data was restore, and the synchronization of multiinterval sampling was realized. When the time delay is longer than 5ms, the relay protection device will be locked out and an alarm will be given. Based on the network testing system, the functions, the performance and the reliability of the delay compensation, the data flow precise control and the sampling synchronous processing of protection devices were analyzed. The networking scheme and the key technical requirements were put forward.

Research on equipment management system of digitalized power plant

LI Fudong1, SU Xin2, ZHANG Tao1

2015, 37(6): 18-20.

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Abstract:In order to realize true digitalization in a power plant, it is necessary to perfect the equipment management and reliability management system and to realize allsided informatization management. The content and the functions of the equipment management system BFS++, which is often used in power plants, were introduced in detail, and an improvement sheme was put forward. The reliability management method was analyzed. The differences between several maintenance modes and the applicable scope of each maintenance mode were pointed out. Aiming at the problems existed in reliability management, the solutions were given.

Research and development of coal blending software and coal blending decision system

ZHANG Jianke1, ZHOU Liqun1, GE Wei2

2015, 37(6): 21-24.

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Abstract:Depending upon theoretic calculation and site test, the safety, economic efficiency and environmental friendliness of the unit after the lignite was blended in combustion were analyzed. The maximum blending ratio and the optimal blending ratio for the unit under different load were determined, and this ensures the characteristics of the blended coal to be matched with boiler design parameters. The influence of the ignite blended combustion on the unit was evaluated. The coal yard management system and the multicoal blend decision system were established to guide the coal blending, and better economic benefit and social effect were obtained.

Study on low voltage ridethrough technology for DFIG

CHEN Da

2015, 37(6): 25-27.

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Abstract:The low voltage ridethrough becomes a bottleneck to restrict DFIG to connect into grid in large scale. The mathematic model of DFIG was established. The influence of grid voltage rapid dip on DFIG was analyzed. An improvement method was proposed, in which the DC side capacitor of DFIG is connected directly with a solar power station by bidirection parallelconnected diodes. The LVRT capability of DFIG can be enhanced by the method, and the stability of the grid voltage will be improved. The simulation result shows that the expected target can be realized using the method.

Application of PLC ROCKWELL to the control system designing of ship unloading machine
XU Bin

XU Bin

2015, 37(6): 28-31.

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Abstract:The paper analyzes,with bridgetype grab ship unloader in a power plant dock as case sample, characteristics and practical advantages of ROCKWELL programmable logic controller (PLC).During the designing, adopted NetLinx open network structure, created 3layer network structure—information, control, equipment for control system, to fulfill the functions of control and management; meanwhile, according to the functional requirements of the controlled object, formulated overall outline and detailed design for module of PLC software structure, data files and professional control.

Compatibility testing of field bus equipment of thermal power plant

CUI Chaochao

2015, 37(6): 32-33.

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Abstract:The significance of compatibility testing of field bus in thermal power plant was analized. The types and the functions of the bus were introduced. The concrete content of compatibility test were introduced. The features of the distributed control system and the bus devices in compatibility were shown farthest. The result in this paper provides technical support for practical projects.

Technical reformation of tower crane FZQ1380

ZHANG Xiaobing

2015, 37(6): 34-35.

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Abstract:The shortcomings of FZQ1380 sticking selfclimping tower crane in efficiency, performance and safety control were introduced. The feasibility and the necessity of the technical reformation of FZQ1380 sticking selfclimping tower crane were expounded. According to engineering practice, the technical reformation scheme was proposed. After the reformation, the tower crane can well meet the requirement of practical engineering operation.

Blowing measures of lowpressure steam pipe of gas steam combined cycle unit

WU Gang, LIU Gang, ZHANG Shaoyong

2015, 37(6): 36-38.

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Abstract:The steam pipe blowing processes for HRSG of two gassteam combined cycle units with different parameters were introduced and analyzed. Some conclusions were obtained from the analysis are as below. When the gas turbine runs with certain load, it can provide blowing steam with high parameters, and the duration of pipe blowing and the consumption of desalting water can be reduced correspondingly. To arrange the lowpressure steam blowing pipe separately is useful to avoid interaction effect between the highpressure steam system and the lowpressure steam system of HRSG in combined cycle system.The selection of pipe blowing parameters in this paper can be used as reference for similar units.

Analysis on fault of 9FA gas turbine in ignition process

CHEN Liangchen

2015, 37(6): 39-42.

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Abstract:The start ignition process and related logial control and protection of 9FA gas turbine, which is manufactured in GE, were introduced. Based on analysis of concrete fault cases, the idea for solving problem was clarified, and some conrete suggestions were proposed, which can be used as reference for handling with similar problems.

Optimized scheme of mnlticoal grades blending in thermal power plant

HOU Dean, WANG Wei, JIANG Pengbo

2015, 37(6): 43-44.

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Abstract:The market coal supply is changing everywhen. In order to perchase coal of multiple grades according to optimal ratio to ensure the blended coal quality can satisfy the requirement of boiler design indexes and to reduce comprehensive coal price, a power coal quality calculation model was developed. According to this model, a coal blending experiment for the boiler No.4 of a power plant was carried out. The coal quality parameters of unit operation were ensured, and the comprehensive coal price was reduced.

Application of intelligent soot blowing optimization system in 1039MW unit

DONG Ruixin1, BAI Guohua2, SHI Changjiang1

2015, 37(6): 45-47.

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Abstract:Aiming at the operation situation of the boiler of 1039MW ultra supercritical unit, based on the data transmission phasical link channel and the software monitor model, according to the law of soot blow alarm during test and commisioning, an overall plan of intelligent soot blow was developped. The operating performance of the system was enhanced, and the safety and economic efficience of the unit were improved.

Analysis on fault of primary air fan of 600MW unit and treatment

CHEN Jianfei

2015, 37(6): 48-51.

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Abstract:Taking the 600MW unit of a thermal power plant as example, the common faults of primary air fan were analyzed. The relevant solving methods were proposed and adopted. Favorable result was obtained, and the safe and reliable operation of the unit was ensured.

Operation scheme of 300MW unit without electric feed pump

WANG Pingbo

2015, 37(6): 52-53.

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Abstract:The power of the electric feed pump is larger, and to reduce the usage rate of the electric feed pump can reduce the station service power consumption rate. One auxiliary steam source was added for the turbofeed pump, and the working range of the turbofeed pump was enlarged. Then the turbofeed pump can instead of the electric feed pump during unit startup and shutdown processes, and the auxiliary power consumption was reduced. At the same time, in accident treatment, the unplanned outage time can be reduced. It was verified by the practice of a 300MW thermal power unit that to add the auxiliary steam source can reduce the power consumption of the electric feed pump effectively and can improve the unit operation reliability.

Comparison and summary of opposed firing boiler and tangential firing boiler

YANG Fan1, ZHAO Qi2

2015, 37(6): 54-56.

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Abstract:The main technical parts of boiler, such as the burners, the air distribution, the water wall, the NOx control and others, were discussed. The features and the differences of the opposed firing boiler and the tangential firing boiler were compared and summarized.These two kind of boiler have their own point，in the actual choice of combustion mode, it is necessary to take into consideration.

Optimization of AGC of unit No.1 in Sanhe Power Generation Company Limited

ZHOU Jianyu, ZHU Nengfei, LE Lingzhi, WU Ke, ZHANG Minghui

2015, 37(6): 57-61.

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Abstract:The indexes of performance check of unit No.1 AGC in Sanhe Power Generation Company Limited and the AGC control mode were introduced. The common problems in AGC control of thermal power units were analyzed. The key factors influencing on AGC performance were pointed out. Combining with the unit operation condition, the control loop influencing on AGC performance was optimized. The check requirements of the power grid on AGC availability rate and AGC regulation performance of the unit No.1 were satisfied.

Operation mode optimization of gland seal systen of 600MW steam turbine

HUANG Taiming, TAO Zaisu

2015, 37(6): 62-63.

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Abstract:In operation of the gland seal system of the 2×600MW steam turbine of Baiyinhua Jinshan Power Generation Company Limited phase I, there were abnormal phenomenons, which include larger temperature deviations of two measuring points after attemperation of the fed steam of lowpressure gland seal, the lower fed steam temperature of lowpressure gland seal, the larger attemperating water flow and others. The parameters, such as the pressure and temperature of the fed steam of the turbine gland seal system, were analyzed and adjusted. The operation condition of the turbine gland seal system was improved effectively. The further optimization measures of the glnad seal system were proposed.

Cause analysis and solutions for nontypical condenser water leakage

XIE Bing

2015, 37(6): 64-65.

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Abstract:After analyzing two accidents of nontypical condenser sea water leakagein Guangdong Huizhou Natural Gas Power Generation Company Limited, one case is found to be generated byinstallation defects of flushing pipe of differential pressure transmitteron condenser′ secondary strainer; inthe other case, it was theremains of sea waters in titanium tube during a previoustube leakage restoring work. After taking appropriate measures, the water leakage problem is solved successfully, toguarantee the safety and stability of generating set.

Analysis on safe operation of condensate polishing system in thermal power plant

TU Xiaofei, TANG Xiaohui, ZHANG Jianpeng

2015, 37(6): 66-68.

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Abstract:The safety accident of the condensate polishing system of a thermal power plant and the present existing general safety hidden dangers were analyzed. The relevant improvement measures were proposed and implemented. The longperiod, safe, effective and economical operation of the condensate polishing system was ensured.

Suggestion on design optimization of Eastern Junggar coalfired boiler

LI Peng, ZENG Qi, LI Dongben

2015, 37(6): 70-71.

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Abstract:The Eastern Junggar coal is of features of easy contamination and slagging, and this threatens safe and stable operation of the boiler seriously. Considering the boiler design size, the secondary air inlet arrangrment, the burner form, the thermal parameters and so on, the slagging prevention features of the boiler were analyzed. The suggestions of design optimization for Easten Junggar coalfired boiler were proposed, which can be used as reference in type selection and refomation of Easten Junggar coalfired boiler.

Analysis on economy of photovoltaic power generation of China

LIU Baosong, LIU Xiaoguang, LIU Qingchao

2015, 37(6): 72-73.

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Abstract:According to the current photovoltaic electricity price, the photovltaic annual utilization hours in various regions and the current construction cost of photovoltaic power station, the financial internal rate of return of capital funds was analyzed. Then the data of the minimum annual utilization hours in various regions under profit condition were obtained, which provide a foundation for investment decision of domestic photovoltaic power station project. 

Electricity consumption analysis of inverse power transmission plant of AP1000 nuclear island

LI Jian, ZHAO Ying, XIE Xiaodong, ZHAO Zhongmin

2015, 37(6): 74-76.

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Abstract:In order to successfully power AP1000 nuclear island′s medium and low voltage load center, we adopted the inverse power transmission research method, took normal control function as research object,and defined the range of basic electric instrument system of inverse power transmission plant on nuclear island. Based on this, we concluded, in aspect of project management,major problems that may happened during each process of inverse power transmission, designing, procurement and construction and derived constructive suggestions for improvement, which enhanced reaching IE milestone of AP1000 nuclear island project.

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