Integrated Intelligent Energy

The main ways in energysaving of high capacity power boilers

HUANG Xinyuan;XING Fanqin

2009, 31(10): 1-3.

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The main ways in energysaving of high capacity power boilers were summarized which include to put more efforts in technical reformation, to strengthen management and adjustment of boiler operation, to tap the energysaving potential of auxiliary equipment, to research the combustion of lowgrade coal, to reduce the accident rate, and etc. Some concrete suggestions were put forward, and several examples were analyzed.

Study on performance of supercritical boilers with capacity greater than 600MW in coalfired power plant

HE Hui;WU Qiang

2009, 31(10): 4-10.

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Based on summarizing and digesting foreign technique, according to the actual conditions of China, the main technical characteristics and operation features of the supercritical boilers with capacity greater than 600MW by the Shanghai Boiler Works Corporatiom Limited, the Dongfang Boiler Group Corporatiom Limited and the Harbin Boiler Corporatiom Limited were studied. The main technical characteristics of the boilers were analyzed and compared. Aiming at the problems existed in domestic main boilers for power plant, four opinions were put forward.

The turbine bush failure analysis of ultra supercritical unit

LIU Hongguo

2009, 31(10): 11-15.

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A babbit peel off fault was take place in No.1 bush of an unit in some plant. The chemical composition analysis, the metallurgical structure analysis, The XRD analysis and the Xray energy spectrum analysis were accomplished for the peeled babbit alloy. The results show that the Sb content was accorded with the requirement, and the contents of Cu, Pb and Zn were not conformed to the standard. In the babbit alloy, the β′ phase（SnSb） exist slight aliquation at individual local position, but serious aliquition, delamination and other casting defects were not discovered. The average proportion of the sum of ε phase（Cu6Sn5） and β′ phase（SnSb） was 39.5%, there was ε layer discovered at the alloy side of joint surface Sn layer. It is suggest that the allowed chemical composition deviation range and the contents requirement of hard phases should be listed clearly in the order agreement of same parts.

Reason of higher heat rate of the 600MW supercritical turbine

MA Shidong

2009, 31(10): 16-18.

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Since the No.2 unit of a power plant was put into production, the economical indicators and the heat rate always were higher than the design values, and the unit efficiency was not reached to the design demand. Therefore, the turbine thermodynamic performance test was carried out before No.2 unit overhaul, and the turbine heat rate and the efficiency of high pressure cylinder and middle pressure cylinder under three operation conditions of 3VWO, 450MW and 300MW were obtained by calculation. Then the reason of higher heat rate of No.2 unit turbine had been found, and some optimization measures were proposed providing reference for overhaul and technical reformation of No.2 unit.

Economical efficiency analysis of whole process water feeding by turbofeed pump in 600MW supercritical units

CHEN Li

2009, 31(10): 19-21.

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The electric pump is usually used to feed water for boiler during the startup and shutdown processes of 600MW supercritical units, the turbofeed pump starts to work until the unit load reaches 30% BMCR. Through continuous exploration, one power plant has used successfully the turbofeed pumps to feed water for boiler of 600MW supercritical unit during the whole process of startup and shutdown, and the electric feed pump was only as backup, this optimal way of feeding water is effective on saving electricity and increases the economical efficiency of unit operation.

Improvement of the accuracy and reliability of pressure signals in shaft gland seal system of ultra supercritical unit

WANG Yongjun;WU Bijun

2009, 31(10): 22-23.

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This paper analyzed the characteristics of pressure signals of gland seal system of 1000MW ultrasupercritical unit in the Beilun Harbor Power Plant Phase III. The effective technical controlling measures were taken to ensure the accuracy and reliability of measurement and transmission for the pressure signals of gland seal system.

Optimization of dry ash removal system design scheme for a 600MW unit in thermal power plant

BAO Pinglang

2009, 31(10): 24-26.

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The ash emissions of first and second electric fields of precipitator are about 96% of the total ash emission of boiler. Therefore, the ash conveying effects of first and second electric fields are very important for rational configuration scheme of whole system. The configuration scheme of dry ash removal system of 600MW unit in Ningxia Shuidonggou Power Plant had been optimum regulated, and the safety, stability and economical efficiency of the unit were raised obviously due to the optimization.

The comparative analysis of bending and elbow in main service piping design of coalfired power plant

ZHANG Hongyuan;L Daohua;YAN Ping;L Jizu

2009, 31(10): 27-31.

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The application of bending design for main service piping adopted in 2×1000MW ultrasupercritical units of Shanghai Waigaoqiao Third Power Plant was introduced. The technical advantage of the replacement of elbow by using of bending was analyzed. The comparing of concrete data shows that the adoption of bending design can reduce the investment, decrease the heat consumption rate which is helpful for energy conservation and emission reduction, and the design is beneficial for the piping safe operation simultaneously.

Realizing the simulation process of Ovation for Solaris engineer workstation in the PC

GUO Bochun

2009, 31(10): 32-35.

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The use of virtual machine in the PC with Windows XP was discussioned. The Solaris operation system and Ovation DCS software were installed, and the simulation process of engineer workstation was realized. The result provides the foundation for the thermotechnical engineers, in whose power plant the Ovation for Solaris system was adopted, to establish simulation training platform themselves.

Optimization and improvement of control strategy for FGD control system

KONG Qingfu

2009, 31(10): 36-37.

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The primary FGD process and the problems existed in TXP control system of Hangzhou Huadian Banshan Power Generation Corporation Limited were introduced. The TXP system had been replaced by novel NETWORK-6000 system, and the control strategy had been improved and optimized, and excellent effects of reformation were obtained.

Application of plasma device in ignition and combustion stabilization of 2023t/h boiler

YU Liangping;ZHAO Zuoqi

2009, 31(10): 38-42.

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The working principle and structure of plasma igniting burner were introduced, and the configuration of its auxiliary system was described. When the plasma ignition system is applied in tangentially fired boiler, the FSSS control logic needs some modification, and this modification was analyzed. The plasma ignition operating procedure was described; the matters needing attention while plasma ignition burner is putting into operation and the problems existing in its operation were pointed out. Aiming at great amount of oil consumption in unit startup and shutdown process, the plasma ignition technology was adopted in a 600MW unit of Inner Mongolia Huadian Baotou Power Generation Corporation Limited; and the unit cold start and hot start, the unit shutdown with variable parameters, the repairs of induced draft fan, forced draft fan, primary air fan and air preheater were realized without oil consumption, and good economical effects were obtained.

The application and practice of optimized control in circulating fluidized bed boilers

LIU Xuewu

2009, 31(10): 43-47.

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The availability of automation system of domestic CFB boiler is generally lower. In order to enhance the overall efficiency and competitiveness of power plant, the higher control requirement of DCS had been put forward. Because of the special combustion characteristics of CFB boiler, the conventional PID control strategy will difficultly realize combustion automation control of CFB boiler. This leads the availability of automation system of CFB boiler unit to be lower and turbineboiler coordinated control can basically not be put into operation. In this case, the application of the optimized control system in combustion control of CFB boiler is effective solving way.

Analysis of structure and operation of shaft gland seal system in 600MW unit

BI Huanan;LI Hongyan

2009, 31(10): 48-50.

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The structure and operation features of shaft seal system of 600MW turbine made by siemens were introduced. Aiming at the problems occurred in operation, the relevant solving methods were put forward. The safety and economical of the shaft seal system were analyzed and the result can be used as reference for commission and operation of similar units.

Application effect analysis and operation management of coal stratified combustion equipment

HUANG Changjun;JIANG Jingzhi

2009, 31(10): 51-53.

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The coal stratified combustion technology is improved technology invented for overcoming the defects of forward traveling grate boiler. It can overcome in maximum way the defects of traveling grate boiler which includes incomplete combustion, low heat efficiency, insufficient output power, slow load response, and etc. combining with production practice, by using the theories of mechanics, thermodynamics and combustion science, the defects in the combustion process of forward traveling grate boiler were analyzed. The practical effects of the coal stratified combustion technology were compared and analyzed, and according to the equipment operation characteristics, some management measures were put forward.

Matters needing attention in setting of UR protection devices

LI Chuanbo

2009, 31(10): 54-56.

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The composition and principle of UR series protective equipments manufactured by GE Corporation were introduced. Based on the practical situation of setting, installation and operation of the protective equipments in 1000MW units such as one of Yuhuan Power Plant, the experience of protection setting were summarized.

The equipment dedicated for installing and removing of protection panel with front opendoor

YANG Zhongli;LI Jiapeng;WANG Bin

2009, 31(10): 57-58.

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Based on the feature analysis of site installation of protection panel with front opendoor, combining with replacing of the protection panel, the dedicated equipment for installing and removing of protection panel was made specially, and the risk caused by excessive vibration in removing and installing process was reduced, and the work efficiency was improved.

Technology analysis of replacement of power transformer parts with oil filled

YU Jinli;JIAN Youwei;YAN Dazhen

2009, 31(10): 59-60.

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The oil leakage fault of component parts of largescale oilcooled transformer often occurred due to different reasons, and this directly influences on the safe operation of power grid, so the component parts must be replaced. This article introduced the repair technology for replacing the middle and low component parts of transformer quickly and economically under the emergency circumstances, as a reference.

Application of SIMATIC S7-300 PLC in main transformer cooling control system

HUANG Xibin

2009, 31(10): 61-63.

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The features and hardware and software configurations of the SIMATIC S7-300 PLC control system produced by Siemens were introduced. The simple, reliable and higheffective control of water cooling system for main transformer oil was realized by using of the SIMATIC S7-300 PLC control system. The temperature of the main transformer oil was controlled in rational operation range, and the safety and stable operation of the main transformer was ensured, and its service life was extended.

Analysis on the reason of the differential protection malfunction of the start & standby auxiliary transformer

HUANG Haibo

2009, 31(10): 64-67.

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Aiming at a malfunction accident of differential protection of start & standby auxiliary transformer caused by the load grounding fault in Hunan Huadian Changsha Power Generation Corporation Limited, according to the fault record diagram, the protection action report and the practical condition of the accident field, the accident developing procedure and the behavior of the relay protection were analyzed. The fault point was found by experiment. The reason of the malfunction was discovered. And some concrete preventive measures were proposed.

Suppression measures of shortcircuit current in connecting to power system of small power plant

GAO Kun;YUAN Liang;LI Qiang;SONG Xiaokai

2009, 31(10): 68-69.

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Aiming at the exceeding limit of shortcircuit current in connecting to power system of the small power plants, the advantages and disadvantages of various suppression measures of shortcircuit current were compared and analyzed by the calculations and verifications of a practical project. The influence of installation position of the currentlimiting reactor on current suppression effect was illustrated emphatically, and some related suggestions were proposed for engineering design as reference.

The new thinking of condenser cleaning for running at daytime and stopping at night unit

SHEN Hong;YANG Yongzhong

2009, 31(10): 70-72.

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The importance of the condenser water side cleaning was introduced, and the common water side cleaning method and its advantages and disadvantages were introduced too. The basic cleaning steps by high pressure water jet were described, and the practical application effect of the fast waterdrainage method in water side of the condenser was discoursed. Some problems, such as air accumulation in the condenser water side, were analyzed.

Application of equipment defect management system in power plant

ZHU Lei;LU Yaoping;ZHANG Su

2009, 31(10): 73-75.

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The defect management system of Jiangsu Huadian Yangzhou Power Corporation Limited was introduced. The system functions and application effects were described. By using the defect management system, the manager will can grasp and understand equipment operation status, and the reliability of generation system will be raised.

Technology analysis and design optimization of limestonebased wet FGD

TAO Aiping

2009, 31(10): 76-78.

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Combining with the limestonebased wet FGD system of Guizhou Dafang Power Plant, the difference on system configuration and electricity consumption of different desulphurization technology under the same wet FGD process, same design condition and same performance requirement was expounded, and then the importance of FGD system design optimization was explained.

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