Integrated Intelligent Energy

Debugging of supercritical oncethrough boiler of 660MW unit

CHEN Hui;LIU Shihui;HUANG Qilong;WANG Sheng;LI Chaobing

2012, 34(5): 1-3.

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The design features of the newbuilt 2×660MW supercritical oncethrough boiler of a power plant and the debugging situation of the boiler were introduced. The problems occurred in boiler debugging process were summarized; the reasons of the problems were analyzed, and the methods for solving these problems were proposed, which provides reference for debugging of supercritical oncethrough boiler.

Optimized adjustment of combustion for Wshape flame boiler in 660MW unit

JIA Yonghui

2012, 34(5): 4-7.

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Due to that the practically fired coal of the boiler deviates greatly from the designed coal grade, the efficiency of the Wshape flame boiler of the 660MW unit in a power plant is lower. Aiming at this problem, the combustion optimized adjustment experiment was carried out. As first step, the F damper was regulated to balance the oxygen distribution in the outlet of the coal economizer. Then, starting from the main factors influencing on the operational economical efficiency of the boiler, combining with the features of the boiler, the influences of the load variation, the second air flow variation, the coal quality variation and the open degrees of C damper on the boiler efficiency were analyzed; and a rational operating condition was proposed.

Analysis on reasons of hightemperature corrosion of water wall in 660MW unit boiler and countermeasures

CHEN Kelu;RAO Hongjian

2012, 34(5): 8-9.

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The hightemperature corrosion occurred in the water walls of two 660MW supercritical oncethrough boilers in a power generation company limited. The factors leading to hightemperature corrosion of the water wall were pointed out. The gas temperature and the chemical components of the gas in side wall of water wall were detected. The reasons of the hightemperature corrosion of water wall were analyzed; and the relevant preventive measures were proposed.

Operation of water feed system of 630MW supercritical unit during extreme hot start

CAI Xiao

2012, 34(5): 10-12.

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The operation points and the matters needing attention when feeding water to the 630MW supercritical unit boiler using turbofeed pump at extreme hot start were analyzed. To adopt this operation mode widely can reduce the purchased electricity from the grid and improve the operation economic efficiency.

Analysis on application of algorithm SoftSOE

CUI Chaochao;ZHU Jing;XIAO Sheng

2012, 34(5): 13-15.

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In daily production, more and more small faults and small accidents occurred in periodlevel; and the current distributed control system has not effective method to record the periodlevel signals. The OVATION system manufactured by Emerson provides a special algorithm, SoftSOE, to record the periodlevel accidents. The application of SoftSOE in a power plant shows that by using the SoftSOE technology, the accident analysis measure was enhanced greatly, and the safety of the unit increased vastly.

Reformation of cleaning system of Dayuandu Hydropower Station

QING Hui

2012, 34(5): 16-17.

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In operation of the hydropower stations, in order to increase the power generation efficiency of the generator set, it is very important to solve the sewage blockage of the trash rack. After the cleanfeculence machine of Daduyuan Hydropower Station had been reformed, the feculence cleaning effects is good; the underwater devices operate reliably; the reformation effect is favorable.

Analysis on design problems of circulating water system for littoral power plants

ZHOU Qiang

2012, 34(5): 18-20.

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Aiming at the problems in circulating water system design, the importance of position selection for the water intaking area and the hydraulic head in water intaking place was expounded. The reasons of corrosion, dirt and blockage of the equipments in circulating water system were analyzed; and relevant solution was proposed, which can be used as reference for treating similar problems.

Study on static and dynamic characteristics of Ushaped gate structure

XIE Zhixiong;SUN Xiaofeng;TAN Shoulin

2012, 34(5): 21-23.

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Using the software ANSYS, the static and selfvibration characteristics of the Ushaped gate and the corresponding plate gate structure under different operation conditions were analyzed and calculated. The differences of the two structures in stress, displacement and selfvibration characteristics were compared. The study result offers technical basis for perfecting the design of the Ushaped gate and provides reference for the design and calculation of similar gate structures.

Analysis on iron loss test of stator of unit No.4 in Luding Hydropower Station

ZHANG Benjian;ZHANG Yake

2012, 34(5): 24-25.

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The theory, the calculation method, the connection and the devices selection of the generator stator iron loss test in Luding Hydropower Station were introduced. Based on the analysis of the test data of unit No.4, it is verified that the quality of the stator core lamination stack and the field installation technology are accorded with relevant requirement, and it was verified that the test method is feasible too.

Analysis on reason of abnormal tripping caused by fault of adjacent 10kV transmission line

YIN Xingguang;WAN Yujian;ZHANG Xinzhou;GUO Fengqi

2012, 34(5): 26-27.

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Due to the fault of adjacent line, the 10kV line F12 was tripped abnormally many times. The abnormal tripping was analyzed; the main reason of the abnormal tripping was found; the solution was proposed; and the suggestion for preventing similar accidents was given.

Reformation of grounding grid of 110kV substation for resistance decreasing

SU Rui

2012, 34(5): 28-30.

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Taking the Xuejiawan Haizita Substation as example, the grounding resistance of the substation was estimated. The methods for grounding resistance decreasing were analyzed. Based on comprehensive comparison, the reformation scheme had been determined, and favorable benefit was obtained.

Reason analysis and control measures of residual chlorine exceeding standard in inlet of reverse osmosis device

ZHANG Ya;HAO Zhirui;XU Tao

2012, 34(5): 31-32.

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At the inlet of the reverse osmosis device, due to that the residual chlorine exceeds the standard, the membrane will be oxidized and decompose; and the performance and service life of the membrane will be affected. Combining with practical operation, based on analysis, the reason of the residual chlorine exceeding standard at the inlet of the reverse osmosis device was found; and the control measures were proposed. So the safe and stable operation of the make up water treatment system of the boiler was ensured.

Strategy for solving power flow problem of distribution network with distributed power sources

ZHONG Hongmei;ZHANG Feifei;YE Changqing

2012, 34(5): 33-36.

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The mathematic model of connection of distributed power sources into power grid was studied. Several familiar nodes of distributed power sources were divided into the PQ node, the PV node and the PQ(V) node. Based on this, depending upon the calculation function of MATLAB, using the principle of the forward/backward sweep algorithm, the power flow calculation of the distribution network with distributed power sources was carried out. The improved algorithm was adopted in the calculation. At last, the calculation speed and the convergence of the used algorithm were analyzed. The result shows that using the model and the algorithm, the power flow problem of distribution network with multiple distributed power sources can be solved quickly and conveniently.

Realization of automatic control of secondary filter screen in DCS

WANG Feng

2012, 34(5): 37-39.

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Taking the EDF type secondary filter screen adopted in circulating water systems of units No.3 and No.4 of Guangdong Red Bay Power Generation Company Limited as example, the structure and working principle of EDF type secondary filter screen were introduced. According to its working principle, the automatic control logic was designed, the control logic and relevant picture were configured in distributed control system, and the automatic control of the secondary filter screen was realized.

Control strategy of automatic generation control of thermal power plant

HE Xiongwei;ZHAO Junbin

2012, 34(5): 40-42.

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Aiming at the current situation of the Shanxi Power Grid, the concrete situation of AGC examination of the Shanxi Power Grid after the ‘two detailed rules’ were implemented was analyzed; and the AGC control strategy for the thermal power plants taking part in the examination to response the ‘two detailed rules’ was put forward.

Reason analysis and treatment of tripping accident of high voltage standby transformer

WANG Hongliang;WANG Guoqing

2012, 34(5): 43-44.

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Taking a tripping accident of the high voltage standby transformer of a power plant as example, the reasons of the accident were analyzed, and the response strategy was proposed, which provides reference for treating similar problems.

Reason analysis and treatment measures of boiler slagging and fire extinguishing of 300MW unit

YIN Qingdong;LIU Wenxian;WEI Gang;WEI Yingli;LIU Binjie

2012, 34(5): 45-47.

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Aiming at serious boiler slagging and extinguishing of the 300MW subcritical unit in a power plant, combining with the boiler structure features,

the coal characteristics and the actual operation situation, the main reasons causing the boiler slagging were analyzed. Some targeted control measures for

preventing the boiler slag falling and extinguishing, such as the coal management, the oxygen adjustment and others, were proposed. After the measures

adopted, obvious slagging of the boiler was eliminated; and favorable effect of the control measures was obtained.

Analysis on reasons of stall of operating induced draft fan and preventive measures

CAO Yongqi;YAO Zhongdong

2012, 34(5): 48-51.

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In operation of side A induced draft fan of boiler No.1 in Yaomeng Power Company Limited, the stall phenomenon occurred. According to the operation

data and theory analysis, it was considered that the stall reason of the said induced draft fan is low temperature corrosion caused by ash deposition of the

preheater. After effective measures were adopted, the stall phenomenon was eliminated.
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Analysis on action of PCM device in switch over process of dual channels of optical fiber protection

HOU Chaojun;DONG Cuifang;ZHANG Ning

2012, 34(5): 52-55.

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According to analysis on action of P546 optical fiber differential protection in 500kV Luxin transmission line No.1 to response the fault occurred

in outside of the zone, it was pointed out that in the dual channels switch over process of the optical fiber protection, the transmission delays of NOKIA

PCM device in the two directions of receiving and sending are different; and the importance of the PCM device in the dual channels mode of the optical fiber

differential protection was explained.

Reason analysis and treatment of abnormal vibration of circulating water pump

WANG Lu

2012, 34(5): 56-59.

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The abnormal vibration occurred in operation of circulating water pump of Anhui Chizhou Jiuhua Power Generation Company Limited was introduced.

Based on the overhaul of the pump multiple times, the reasons of frequent vibration of the circulating water pump were analyzed. According to the analysis

result, the pump had been reformed and upgraded completely and technically by the Changsha Pump Works Company Limited; the vibration of the circulating water

pump in long time was eliminated thoroughly; and the economic benefit of the power plant was improved obviously.

Reason analysis and treatment of restarting fault of I/A Series two controllers

MAO Yisheng

2012, 34(5): 60-62.

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In the desulphurization control system of units No.3 and No.4 in Guangdong Zhuhai Jinwan Power Generation Company Limited, the Foxboro I/A Series

distributed control system is adopted. The off-line and restarting phenomenon of single or double controllers in system occurred randomly, which threatens

the safe and stable operation of the unit severely. The synchronous records of the system management counter and the controller were analyzed to determine

the network problem; the node bus network had been monitored, and the data streams between stations were analyzed. It was determined finally that the data

acquisition and send program of the supervisory information system in plant level, Opifox, caused the congestion of the node bus network of desulphurization

distributed control system, which makes the two controllers to be asynchronous and to start up again. The data acquisition and send program had been

replaced, and at last, the difficult problem was solved.

Analysis and optimization of service power consumption rate of limestonegypsum flue gas desulphurization system

DU Zhen;ZHU Yue;HE Sheng;CHENG Xueshan;ZHANG Yang

2012, 34(5): 63-66.

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The influence of the unit capacity, the unit load and the sulfur content in fired coal on the service power consumption rate of the limestone

gypsum FGD system was analyzed; and it was obtained that the main reasons of the higher service power consumption rate of the FGD system are the higher

sulfur content in fired coal, the higher soot concentration in the inlet of FGD system, the equipment blockage, the scaling and others. In order to reduce

the service power consumption rate of the FGD system, some optimization measures, such as to regulate the desulphurization operation mode, to adopt powerful

maintenance measures, to insure the precision of the instruments and so on, were proposed and adopted, which lays a foundation for normal, stable and energysaving operation of the FGD system.

Optimization of boiler fed by doubleended ball mill for energy conservation

LIU Yanpeng;MA Bin;DONG Yufang

2012, 34(5): 67-70.

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The fundamental principle of optimization operation of boiler for energy conservation was given. Taking the boiler fed by doubleended ball mill

directfiring system as example, the optimization operation technology of the boiler under 70% rated load for energy conservation was studied and tested.

The result shows that when the boiler is under rated load, it is necessary to stop one of the three mills and to pay attention to the influence of the

combining operation mode of the operating mills on the energy consumption of the unit.

Application of SNCR flue gas denitration technology in garbage incineration power plant

ZOU Jinsheng;WANG Zhiqiang

2012, 34(5): 71-73.

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The construction and operation of the SNCR flue gas denitration system of a domestic garbage incineration power plant were introduced. After the

SNCR technology was adopted, the NOx emission value of the power plant kept less than 150mg/m3 stably in long term, which shows that the SNCR

technology is suitable to the features of domestic garbage incineration power plant, satisfies the requirement of environment protection and deserves more

wide application.

Optimized design of capacity expansion reformation project of FGD system

MENG Fanqiang;CONG Xiaorong

2012, 34(5): 74-76.

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Along with gradually shortage of domestic coal supply, the quality of actuallyfired coal is greatly deviated from designed coal quality in many

power plants; and this causes the mass concentration of SO2 in inlet of FGD system to increase in large amplitude. So ，the existing FGD equipment must be

reformed to increase its capacity. Combining with the capacity expansion reformation project of FGD system of a power plant in Guizhou, the capacity

expansion reformation scheme was expounded in detail. The design experience was summarized, which provides reference for FGD capacity expansion reformation

projects in future.

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