Integrated Intelligent Energy

Analysis of motor start up voltage drop for the coal handling system of Therma South Thermal Power Plant in Philippines

YANG Yanjing1, ZHANG Lili2, LING Duanqiang3,CHANG Liyong1

2016, 38(6): 1-5.

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Abstract:Based on the Therma South Project in Philippines,this paper analyzed the full voltage start up voltage drop of low voltage squirrel cage induction motor, which is commonly used in engineering procurement construction (EPC) project of coal handling system of power plant. And aiming at the different transformer capacities and power supply distances,this paper obtained the start up data of motors and built the rapid calculation start up data of mainstream motors,which has guiding significance for the motor start up check in project design and has notable effect in engineering practical application.

Design feature of coal handling system in Ningxia Zaoquan Power Company Limited

QIAN Ximing

2016, 38(6): 6-10.

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Abstract:Ningxia Zaoquan Power Company Limited is a large coal fired power plant with groove bottom drive railway for coal unloading, fully enclosed coal yard with strip type bucket wheel machine, intelligent control system for fuel, curved coal chute, dry fog suppression device, coal yare spray with desulfurization waste water and controllable mechanical soft start device, which is located in alpine region. This paper gives detailed instruction on the design feature of coal handling system, and brings up a few problems that need to pay attention to.

Simple analysis of MQ1200/68 Hami Xuzhou Coal Mining Group strip coal storage

GUO Lianhe

2016, 38(6): 11-12.

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Abstract:Portal type reclaimer adopted continuous herringbone reclaiming, and full section reclaiming. The physical and chemical properties of different raw materials, after each treatment to improve the physical and chemical properties, composition fluctuation is small, so as to simplify the client's production process and operation, improve the technical and economic indicators, increase the benefits. By introducing the major components and principle of MQ1200/68 portaltype reclaimer, could help portaltype reclaimer selection.

Study on the inflection point distribution rule of power supply coal consumption for 600MW coal fired power unit

LI Yifei1, NIE Chenhan2

2016, 38(6): 13-16.

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Abstract:Power supply coal consumption is a total index of generating equipment in thermal power plant and system operation performance, which reflects the overall operation level of power plants.This paper conducted a regression analysis on the large number of historical data of a certain power plant, and discovered that there exists a non linear relationship,which carries an obvious inflection point of coal consumption,between the unit load rate and the power supply coal consumption.After that,the inflection point characteristic of single unit coal consumption was confirmed by experiment. At last,this paper analyzed the influences of turbine heat rate,boiler thermal efficiency,auxiliary power ratio and external factors to the power supply coal consumption, and it provided technical support to thermal power plants to making the maintenance plan,generating capacity schedule and distributing the power load,etc

Operation control and analysis of sliding parameter shutdown of 1000MW unit

WANG Xiaolong，MA Ping

2016, 38(6): 17-20.

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Abstract:The sliding parameter shutdown could reduce the body temperature of cylinder quickly, which is benefit for the rapid maintenance of turbine body. This paper introduced the typical sliding parameter shutdown processes of the 2×1000MW ultra supercritical units of Guangdong Yudean Jinghai Power Generation Company Limited.Through analyzing the process control,parameter variation and appeared exceptions of sliding parameter shutdown of No.4 unit,this paper summarized the operation mentality, controlling points and announcements of sliding parameter shutdown of 1000MW unit,and which provided a reference for the slidingparameter shutdown of same type unit.

Research and development of thermal power expert grating system

LIANG Weiping,ZHANG Chaofeng,SHI Liuyang

2016, 38(6): 21-22.

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Abstract:Due to the thermal power plant unit cold start requires long time,procedure is complicated, and surveillance and grating is difficult,a method of “break down composite” was indicate and applied to develop automatic grating system for thermal power plant.This grating system is objective and fair,is able to reflect the proficiency of an operator.The system developed has been applied on simulator,and has broad application foreground.

Design and realization of regional alternate power auto cast function based on fully main station

KANG Feng,YANG Dong,LI Yuping,LIU Qinghai,YANG Qingsong

2016, 38(6): 23-27.

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Abstract:This paper brings up the problem that exists in running regional alternate power auto cast system,which is limited, and high demand on communication network technology.Therefore,a regional alternate power auto cast function based on fully main station is suggested through analyzing the module and control logic and introducing overall framework and implementation method subject range of regional alternate power auto cast plan.

A turbine performance test and economical comparison on an ultra supercritical unit with double reheat unit steam

ZHOU Renmi,WU Henggang,DONG Yihua,ZHU Bao

2016, 38(6): 28-30.

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Abstract:This paper introduces the test method of ultra supercritical double reheat steam turbine performance by taking China’s first 1000MW ultra supercritical double reheat unit as an example. The effects of various parameters on the heat rate were analyzed based on economic comparison with conventional 1000MW ultra supercritical units.

Implement of constant value interaction in automatic distributed wireless public communication network

2016, 38(6): 31-33.

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Abstract:With the fast development of distribution network automation, the requirement of protecting set point and remote maintenance was increased. This paper introduced the structure of wireless public network communication, and explain the communication principle of wireless public network. The protocol IEC 60870-5-101 and case of set point interaction protection was introduced. The feasibility of this case was analyzed.

Analysis of the safety management for the steel penstock installation of high shaft in hydropower station tunnel

YANG Chunguo,CHEN Bo

2016, 38(6): 34-37.

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Abstract:Taking the steel penstock installation of shaft for the conduit system of Hongping Pumped Storage Power Station as an example, this paper introduced the main measures adopted for the safety of steel penstock installation construction of high shaft, which including the selection and special requirements of transportation and hoisting equipment, the design and calculation of temporary working platform for the installation of steel penstock, the selection of cage and steel wire rope, power demand, and the safety management requirements of important processes. Through the implementation of the measures, the smoothly installation of steel penstock was ensured.

Failure analysis and its treatments of natural gas pipeline break of fuel heater

HE Jie

2016, 38(6): 38-40.

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Abstract:Taking the accident of natural gas pipeline break of primary fuel heater as an example, this paper introduced the analysis and treatment processes of the accident, and proposed corresponding countermeasures and improvement measures through analyzing the characteristics of natural gas pipeline break and its forming reasons. And it provided a reference for the failure handling of similar natural gas pipeline system.

A steam turbine A transformer trip accident causes analysis and treatment

LI Shaogang, HAN Lina

2016, 38(6): 41-42.

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Abstract:After analyzed the incident of Huadian Laizhou Power Generation Company Limited 1000MW ultra critical unit steam turbine A transformer trip,the author indicated that the transformer low voltage side outlet busbar is too close to power distribution cabinet,and caused flashover and A transformer protection trip. Treatment measurements and matters need attention while power recovery was indicated. 

600MW opposed firing boiler water wall high temperature corrosion causes analysis and treatment

LI Guangwei,SUN Junwei,HUANG Qilong

2016, 38(6): 43-46.

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Abstract:A power plant’s opposed firing boiler water wall was corroded in large area. Based on high temperature corrosion principle, authors analyzed the caused from coal type, boiler parameter, operation condition, innerboiler flue gas atmosphere and other aspects. Treatment was provided for reference for similar problems.

Reason analysis and treatment vibration in steam turbine driving circulating pumps in heat supply network

LI Na, LIANG Xinlei, XIAO Longyue, ZHANG Jinzhu

2016, 38(6): 47-48.

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Abstract:Analysis on the steam turbine driving circulating pumps operation and debugging in a 300MW unit heat supply network,according to the result of piping vibration in No.2,No.3 steam turbine driving circulating pumps,Studied the cause of the vibration may occur,Finally found the main factors.By taking measures to deal with, the piping vibration problem has been effectively solved.

Multiple source heat supply system heat source balance distribution technology and application

LI Min

2016, 38(6): 49-50.

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Abstract:To balance each heat exchange station in the network, this paper indicated the multiple source heat supply system heat source balance distribution technology, and introduced the general idea and key technology. After application of this technology, network hydraulic balance and heat supplying quality will be enhanced. Maintenance will be reduced. Pipe break and leakage will be effectively avoided.

Coordination calculation of under excitation limitation and field failure protection

LIANG Guozhu

2016, 38(6): 51-52.

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Abstract:In order to confirm whether the underexcitation limitation protection value coordinates with the field failure protection value, both of the values should be checked for power plant. Due to the principle of underexcitation limitation protection is different from that of field failure protection, the values must be normalized to the same plane to be compared. This paper introduced the method of converting impedance circle of field failure protection to power circle, which is verified to be correct by practical calculation and test.

Analysis and treatment of an emergency shutdown of a hydropower unit

CHEN Haojie

2016, 38(6): 53-54.

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Abstract:This paper introduces and analyzed the emergency shutdown of hydropower caused by an accident, which is due to the unreasonable procedures setting of PLC program. It also give an implementation of a series of improvement measures to prevent similar accidents, and to ensure safe and reliable operation of the unit.

Cause analysis of steam turbine jacking oil distributor bolt breakage and treatment

PENG Qinchun, ZHAO Xianguo

2016, 38(6): 55-56.

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Abstract:Successfully put into operation of jacking oil system is the precondition of steam turbine generator. This paper analyzed the accident of a domestic nuclear power plant’s steam turbine generator jacking oil distributor bolt breakage. Based on the failure tree method, the direct cause and primary cause were indicated. Integrated with other causes, the treatment measurements were provided for reference for similar unit fixture quality management.

A interprocess communication optimization method for power protocol conversion device

ZHANG Hang1,WANG Zhenyue1,HAN Dong1,WANG Shuang2，LIU Jingzi2

2016, 38(6): 58-59.

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Abstract:This paper presents a conversion device inter process communication optimization method based on embedded operating system of statute of electricity, and its message structure and message handling ability. It also analysis the superiority of system optimization. This method can solve the embedded operating system in the inter process communication, conventional shared memory message transfer mechanism of unwanted message passing repeated transmission, message processing efficiency is not high.

Design of substation portable inspection terminal interface

TAO Li1,ZHU Xiaoguang2,WANG Shanhong3

2016, 38(6): 60-62.

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Abstract:Substations usually inspected by manpower. Presence rate and inspection quality cannot be ensured. Inspection paper work is difficult for saving and analyzing. This paper discussed applying 2D barcode and portable terminal into substation inspection. Inspection result will be collected and generate inspection report automatically. The portable terminal and terminal interface is the keypoint of the usability of this inspection plan. Concise interface will be increase the efficiency.

600MW sub critical unit boiler SCR improvement test research

YANG Yanxin,ZHONG Jianhui

2016, 38(6): 63-70.

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Abstract:Based on the condition of a subcritical 600MW selective catalytic reduction (SCR) abnormal large ammonia consumption, denitration system operation difficult, NOx large fluctuation and air preheater blockage and other problems, the author analyzed the outlet NOxdensity and flow field. By adjusting ammonia injection grid, the unit operation was optimized, density field was almost equally distributed. Testing point deviation was lowered to under 15%. Decreasing of air preheater resistance pressure difference reach to 26.13%.

Discussion on the problem existing in the SCR denitrification system

ZHAO Li, LI Zhifeng, WAN Jilin, HAO Zheng

2016, 38(6): 71-72.

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Abstract:This paper discusses the problem and solution to the supply of liquid ammonia, ammonia injection grid congestion, catalyst abrasion and ash deposition exist in the current SCR denitrification system. In the increasingly serious environmental situation, ultralow emissions transformation at the same time, also should pay attention to solve the problems existing in the system, to ensure the stable operation of the boiler and to meet the standards of environmental protection.

Preliminary location of combiner box in photovoltaic arrays

CHEN Jianguo, ZHANG Jinjian

2016, 38(6): 73-76.

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Abstract:During photovoltaic power plant design, the position of combiner box is critical. Less cable usage will not only save cost, and will also reduce cable voltage drop loss. Combines with the facts and features of photovoltaic power plant, the mathematic model of combiner box site selection was built bases on Manhattan distance. The objective function was indicated. The most cost efficient point was provided and proved.

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