Integrated Intelligent Energy

Analysis on reasons of rotary air preheater rotor deformation and treatment measures

LIANG Bangping;ZHANG Dong;LIU Zhanmiao

2012, 34(3): 1-3.

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Based on the typical examples, the reasons of rotary air preheater rotor deformation of 600MW supercritical coalfired turbo generator unit in a power plant were analyzed. The technical safety measures of air preheater repairing without outage of the primary air fan were discussed. The technical safety measures for unexpected outage of the air preheater and its emergency repairing were formulated; and the experience on fast correcting the rotor deformation was summarized.

Optimization of automatic air leakage control system of air preheater

LI Xinjian;WANG Shaowei

2012, 34(3): 4-6.

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The operation of air preheater automatic airleakage control system of the 2×670MW unit in Huadian Weifang Power Generation Corporation Limited project phase II was introduced. Aiming at the problems exposed since it has been put into operation, the automatic airleakage control system had been improved; the air damper compulsively lifting function under the condition of exceed air preheater current was added; the protection signals of maximum distortion and complete reset were doubled redundantly. The reliability of the automatic airleakage control system was enhanced; the air leakage rate was reduced; and the better economical benefit was obtained.

Application of multipoint converged sampling for increasing the measuring accuracy of condenser vacuum

GUO Bochun

2012, 34(3): 7-9.

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Some problems, which are existed in design and construction of condenser vacuum measurement sampling, were introduced. Taking the vacuum measurement of 600MW unit of Sichuan Guang’an Power Generation Corporation Limited as example, the feasibility of the multipoint converged sampling reformation scheme, the goal of which is to increase the measuring accuracy of the condenser vacuum, was demonstrated. After the scheme had been implemented, the measurement accuracy of the condenser vacuum was increased, which provides certain convenience for the unit operators to adjust the unit efficiency; and favorable effect was obtained. 

Causes analysis and treatment measures on terminal difference rising of 200MW steam turbine condenser

ZHENG Chunhua;YUAN Jinmei;WU Tao

2012, 34(3): 10-11.

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The condenser terminal difference of unit No.2 in Xinjiang Huadian Hongyanchi Power Plant Corporation Limited was increased along with the service age. In this paper the reasons of the condenser terminal difference rising were analyzed, and the treatment measures using acid cleaning and metallicmembrane plating were put forward. The sediments inside the condenser were removed thoroughly, the terminal difference was lower, therefore the unit efficiency was improved, and the generating cost reduced.
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Influence of faults of steam admission and return system of low pressure shaft gland on condenser vacuum

ZENG Hua

2012, 34(3): 12-12.

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Since the unit No.2 of a power plant was put into production, the vacuum of its condenser was lower at all time. It was found out by complete inspection for the shaft gland that the steam admission and steam return system of the low pressure shaft gland of the bearing shell No.4 and No.6 were connected inversely. After the tubes reconnected conversely, the vacuum of the condenser was reached the designed value; the coal consumption was reduced, and remarkable economical benefit was obtained.

Development and application of PSVR100 excitation regulator

PENG Gang

2012, 34(3): 13-17.

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The development and application of the PSVR100 excitation regulator were introduced. In the PSVR100 regulator, the 32 bits dual core processor MPC8247 and the field programmable gate array (FPGA) are adopted to constitute the hardware framework which can satisfy the requirements of excitation control in high computation speed and high reliability of the regulator; the embedded realtime operation system VxWorks was introduced which can ensure the instantaneity of the excitation control, simplify the development process of the excitation application software and increase the software transportability; the graphical programming method was adopted which can provide certain convenience for software modification during engineering application process; the channel redundance, the sample redundance, the multiple realtime selfchecking and other technologies were adopted to enhance the reliability of the excitation regulator. The successful application of the regulator in selfshunt excitation system and threemachine excitation system (the threemachine brushless system is included.) shows that PSVR100 excitation regulator has excellent control indicators and higher reliability.

Influence of coal quality variation on normal output of unit and countermeasures

LIU Weixiang;WANG Heng;ZHAO Wanfeng

2012, 34(3): 18-21.

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In Guodian Shandong Shiheng Power Plant, the quality of the coal as fired deviates from design value greatly, and which influences on the unit output and the stability of the primary air fan. In order to adapt to the coal quality variation, the air and flue gas system of the boiler No.1 was reformed; the difficult problem of output capacity decreasing frequently caused by poor coal quality was solved effectively, the hidden danger of primary air fan stalling easily was eliminated; and the safe and stable operation of the unit is ensured.

Influence of soot blower steam parameters on the pressure field and the temperature field near boiler tubes

LIU Zhangpeng;ZHEN Hongwei;LI Xiangchao

2012, 34(3): 22-26.

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A new method for researching the influence of the soot blower steam parameters on the temperature field and the pressure field near the heatabsorbing surface tube sections was introduced. Taking a certain soot blower as research object, under the certain range of the soot blower steam parameters, the relations between the pressure and the temperature of the soot blower steam and the pressure field and the temperature field near the tube sections of the heatabsorbing surface were analyzed. 

Control of hydrogen purity of 1000MW ultra supercritical unit generator

CHEN Xiaochun

2012, 34(3): 27-30.

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When the hydrogen is used as the cooling medium of the generator, the control of the hydrogen purity is very important. There are many factors influencing on the generator hydrogen purity, and the sealing oil has largest relevancy with hydrogen purity control. Some indexes, such as the flow and temperature of the sealing oil, the vacuum degree and the dewpoint temperature of hydrogen, were analyzed; the relation between sealing oil and hydrogen purity was expounded. Combining with practical operation of units No.6 and No.7 of Guodian Zhejiang Beilun No.1 Power Generation Company Limited phase III project, some practical and feasible control measures were proposed.

Design method of center support for machine operating in environment with large temperature difference

ZHOU Hong;HUANG Zhihui;YU Peng

2012, 34(3): 31-32.

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A special heatenergy exchanging pump has to work in variable temperature field with large temperature difference of 90℃. Due to the temperature deformation of the material of the pump body, under the affecting of the temperature difference, the displacement in radial direction of the fastening legs (flanges) of the pump can reach 1mm. When the conventional concrete base is adopted to install the pump, very large pushpull force will occur in the support legs positions, which will make the boltup connection to be failure, and it will not be able to keep the install reference of the pump in original position. The design method of a metal support frame was put forward; and the simulation analysis of the design was carried out by using the finite element analysis software.

Technical reformation of sewer system of thermal power plant

LIU Yuan;LU Xian;WU Long;GUO Qiang

2012, 34(3): 33-34.

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There were not multipurpose use measures in the early sewer systems of thermal power plants, the wastewater reuse rate of the plants is lower. Taking the Huangjuezhuang Power Plant as example, a reformation scheme of the original sewer system was put forward. The purpose of the scheme is to search after optimal way of sewer system reformation.

Design and application of control system for 600MW supercritical Wshape flame boiler unit

ZHU Nengfei;LIN Dazhong;SONG Lihong

2012, 34(3): 35-37.

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The design and application of the TCS3000 instrumentelectric integrated distributed control system for 2×600MW supercritical Wshape boiler unit of Sichuan Huadian Gongxian Power Generation Company Limited were introduced. The configuration, the features and practical application of the system were analyzed. The performance of the system after it put into operation was evaluated; and relevant suggestions were given.

Analysis on reason of lower EH oil pressure of 330MW unit

MA Yong;DU Wenbin;XUE Zhiheng

2012, 34(3): 38-40.

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The EH oil pressure of a new domestic 330MW unit became lower. Some possible reasons, such as the insufficient output of the oil feed pump, the leakage of the energy accumulator, the leakage of the overflow valve in outlet of the oil pump, the internal leakage of the regeneration device, the internal leakage of the main stop valve and the regulating valve and the incomplete close of the AST electromagnetic valve, were excluded one by one. At last, it was found that in the inlet thin tube of the OPC electromagnetic valve, one designed orifice was not installed, and this is the real reason of the lower oil pressure.

Hoisting method of heating surface for 660MW supercritical boiler in whole closed boiler room

Hoisting method of heating surface for 0MW supercritical boiler in whole closed boiler room

2012, 34(3): 41-44.

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The problems existing in winter construction of 660MW supercritical boiler were analyzed. Taking the heating surface hoisting scheme of the boiler No.1 in Jiutai Power Plant under the condition of whole closed boiler room as example, the boiler heating surface hoisting measures under the condition of whole closed boiler room were expounded.

Data management system of coal as fired based on VB

CAO Deping

2012, 34(3): 45-48.

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The development process of coal as fired data management system based on Visual Basic 6.0 in Hunan Huadian Changsha Power Generation Corporation Limited was introduced. Several main problems in the developing were analyzed. The automatic weighted statistics of coal as fired data and the automatic report generation were realized. The data management of coal as fired became more scientific, faster and more standardized.

Typical events analysis and preventive measures for typical events of boiler ‘four pipe’ leakage in power plant

ZHANG Jinwen

2012, 34(3): 49-52.

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‘Four pipe’ leakage is the main reason of forced outage in thermal generator unit, classified statistics have been done for ‘four pipe’ leakage events, the causes of the accident and the typical events were analyzed, and the effective protection measures were proposed, forced outage times have been reduced.

Optimized reformation of coal sampler for middle of belt in top of coal silo

XIE Wujie

2012, 34(3): 53-54.

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There were some problems in coal sampler for middle of belt of the coal handling system, which includes that the coal scattered down or adhered to the sampler, the sampling was not prompt, the representativeness of the sampling was bad and etc. These problems were analyzed; and targeted reformation scheme was put forward, which can be used as reference for treating similar problems.

Matters needing attention in using of auxiliary power fast switchover device

YANG Zhichun

2012, 34(3): 55-56.

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The auxiliary power switchover operation of a power plant under the auxiliary power special operation mode was introduced. The matters needing attention in the standby power connecting of the auxiliary power fast switchover device were analyzed; and relevant solving scheme was put forward.

Analysis and preventive treatment of crack and leakage of ‘four pipes’ in large thermal power unit

LI Bing;LIU Xiaoyun

2012, 34(3): 57-59.

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The crack and leakage of the ‘four pipes’ of the 660MW thermal power unit in Shajiao C Power Plant were introduced. The reasons of crack and leakage of the ‘four pipes’ were analyzed in detail. From the angles of the boiler pipe overhaul and the defect management, some targeted preventive treatment measures were given.

Analysis on applicability of early rotary tripper system to C70 type open wagon

LIU Shuming;ZHANG Xuefeng

2012, 34(3): 60-61.

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The early rotary tripper was designed to trip C60 type open wagon. However, at present, the C70 type open wagon becomes current type in railway transportation. Taking the ZFJ-100 type rotary tripper of Fularji Power Plant of Huadian Energy Corporation Limited as example, the carrying capacity of early rotary tripper was analyzed; some reformation measures were adopted; and it was ensured that the early rotary tripper can fit to C70 type open wagon commendably.

Analysis on reasons of lower sealing air pressure of HP863 mediumspeed bowl mill

SUN Zhaoyong

2012, 34(3): 62-63.

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The lower sealing air pressure of the mill of directfired pulverizing system in a power plant was analyzed. It was found that the openings in the connections of the sealing air main pipe and its branches are too small, and this is the main reason of lower sealing air pressure. During an overhaul period, the tee openings had been enlarged to normal size; the sealing air pressure returned to normal; and the safe and stable operation of the mill was ensured.

Analysis on leakage reason of steam lead pipe bend of main security valve in boiler reheater outlet

LIU Junguo

2012, 34(3): 64-65.

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The reasons of frequent leakage occurred in steam lead pipe bend of reheater outlet main security valve in HG-670-13.7-YM9 boiler were analyzed. It was pointed out that the main reason of the frequent leakage occurred in the steam lead pipe bend of reheater outlet main security valve is the thermal stress caused by the excessive temperature difference. After improvement, the leakage fault was eliminated basically. 

Analysis on reasons of repeatedly reducing of limestone slurry flow into absorption tower

GUAN Dachun

2012, 34(3): 66-67.

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The limestonegypsum wet desulphurization technology was adopted in the FGD system of a power plant. During the limestone slurry is flowing into the absorption tower, in a short time, the limestone slurry flow into the tower rapidly reduced from 20m3/h to 4m3/h. After the pipeline had been washed, the phenomenon appeared once again. The reasons of the repeatedly reducing of the limestone slurry flow into the absorption tower were analyzed; some operation control measures were put forward; and the problem was under control.

Application of energysaving synergistic agent in limestonegypsum wet flue gas desulphurization system

YIN Shuxia;SHEN Yuhui;JIN Yingshan;SU Junhua;REN Zhen

2012, 34(3): 68-69.

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Power Generation Company Limited, Huangshi 435002, China)
In recent years, it was frequently found that the mass fraction of sulfur in the fuel coal of many power plants exceeded the design value. In Hubei Huadian Huangshi Power Generation Company Limited, an experiment of adding synergistic agent into the desulphurization facilities had been done, and the result shows that after the synergistic agent was added, the operation of the desulphurization facilities is safe and stable, the desulphurization efficiency is enhanced obviously, and the emission of the flue gas satisfies relevant standard. In addition, one or two slurry circulating pumps can be stopped in system operation, which brings better energysaving result.

Application of energy saving in power plant for the heat pump technology

WANG Donglei

2012, 34(3): 70-74.

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The work principles, classification and performance evaluation indexes of the heat pump technology were introduced. The heat pump technology can be used on reclaiming waste heat of circulating cooling water, heat energy in boiler blowdown water and heat energy of the deaerator exhaust in the power plant. The reasonable utilization of heat pump technology can bring great economic, society and environment benefit. On the basis of work characteristic of the heat pump technology,some proposiations for the heat pump technology application of save energy in power plant were given, which provide certain reference for the such related power plant.

Development of controller of wind turbine master control system based on embedded platform

QIN Chenghu;WANG Bin;DONG Shenggang;SHA Yuting

2012, 34(3): 75-77.

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Taking the megawatt level doublyfed wind power generation unit as control object, based on the embedded computer technology, the network technology and the graph configuration technology, the controller of master control system suitable to wind power generation unit had been developed. Aiming at the requirement of safety chain system specified in relevant wind turbine controller standard, the safety chain node of the controller had been designed, including the hardware circuit design and the software logic design of the safety chain node. By means of relevant configuration and modification, the controller can be used widely in the control systems of various types of wind turbines.

Analysis on reason of watercooling system fault of wind driven generator converter and optimization

LENG Mingquan;ZHANG Bin

2012, 34(3): 78-81.

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Some faults of the watercooling system occurred in 1.5MW series wind driven generator set with higher frequency feedback and great influence, such as the electric heater burning out, the system pressure alarming, the aerocyst cracking and the abnormal electric control logic and others, were analyzed. These faults were analyzed; and according to the analysis result, several suggestions, such as to update the delivered manual of the watercooling system, to optimize the equipment subassemblies, to perfect the electrical control program of the master control system and others, were put forward, which provides certain reference for design optimization and daily maintenance of the watercooling system.

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