Integrated Intelligent Energy

Countermeasures for preventing oxide skin dropping from hightemperature heating surface in 630 MW supercritical boiler

LU Lichun

2010, 32(10): 1-3.

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The reasons and the process of the pipe crack accident of 2×630 MW supercritical unit boiler in Huadian Guigang Power Generation Corporation Limited, which is led by the oxide skin dropping from the hightemperature heating surface, were analyzed, and the relevant treatment methods were proposed. It was shown by the practice that the treatment effects are obvious, and safe operation of the unit was ensured.

Online treatment measures of leakage in boiler economizer of power plant

MIAO Hongjun;XIAO Yusheng;WANG Wei

2010, 32(10): 4-5.

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The leakage fault was occurred in boiler No.5 economizer in the power plant of Hemei Company of Henan Coal Chemical Industry Group Corporation Limited, and the unit safe operation was impacted seriously. The online treatment method of economizer leakage was analyzed, and it was determined to adopt the measure of leaking stoppage with pressure. After the measure was implemented, the operation result shows that the continuous safe and economical operation of the boiler was realized. The method can be used as reference for the power plants being faced with similar problems. 

Reason of boiler MFT tripping caused by air preheater tripping and treatment measures

MA Shidong

2010, 32(10): 6-7.

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In operation of a 600MW supercritical unit of a power plant, the two air preheaters were tripped simultaneously, and this caused the boiler MFT (main fuel tripping) tripped. The main reason is that the motor of belt conveyor of slag bin, which was connected into boiler MCC #2 section, was earthed; and the converter, which controls the motor, had not switched off the fault devices, and this had caused the voltage of boiler MCC #2 section was abnormal; the gear oil pumps of air preheater were tripped, then the main motors of air preheater were tripped though interlock circuit. The power source connection mode and power operation mode were corrected; a spare gear oil pump was added; and the gear oil pump and air preheater intertrip logic and settings were modified. Then the accident of main machine tripping, which should be caused by improper connection and operation of auxiliary equipments, can be avoided.
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Common problems in trial running of Songling cylindrical slag cooler and treatment method

ZHOU Bo;LIU Xu

2010, 32(10): 8-10.

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The structure features of Songling cylindrical slag cooler were introduced; the common problems in trial running of the slag cooler were analyzed; the treatment methods were summarized; which can be used as reference for similar slag cooler in trial running.

Reasons of deficient output of boiler primary air fan

YIN Jun

2010, 32(10): 11-13.

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In the #5 boiler of Huadian International Zouxian Power Plant, when the inlet adjustable baffles of primary air fans A/B were opened fully, the motor currents of the fans often can not raised to rated value, and the outputs of the primary fans were restricted, and the capacity extension of #5 boiler were restricted too. The problems existed in system design, installation, operation and maintenance of primary air fan of the boiler were analyzed, and some suggestions for improving the output of the primary air fan were put forward.

Adjust method of hanger frame of hightemperature reheater in boiler

WANG Qingdong;SONG Jianchun

2010, 32(10): 14-15.

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The expansion of some tubes rows of hightemperature reheater in boiler No.5 of Shandong Bainian Electric Power Development Corporation Limited was impeded, and its hazardness was introduced. Aiming at the technical difficult problems, which has to be solved in adjustment of the hanger frame of hightemperature reheater, a handling scheme was proposed. After adjustment, the tubes can expand freely, and the adjusted condition was remained without large variation. The potential safety hazard of the equipment was eliminated thoroughly, and the safe and stable operation of the unit was ensured.

Analysis on overtemperature reasons of heating surface of platen superheater in supercritical boiler and its countermeasures

ZOU Jiaqi;CHEN Yongbin;ZHANG Dong

2010, 32(10): 16-17.

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After first overhaul for inspection of the oncethrough boiler No.1 of Huadian Suzhou Power Generation Corporation Limited, the overtemperature phenomenon was often occurred in outlet Aside of the platen superheater. According to the analysis, it was considered that the most direct reason of the higher temperature of the heating surface is the combustion stroke in the furnace was lengthened and the flame center was moved up. The ventilation system and the combustion system of the boiler No.1 were optimized, and the wall temperature of the platen superheater left side was controlled effectively. 

A method for CT saturation detection based on wavelet theory

LIAN Deqiang;;WANG Jianfei;CHEN Bin;;CHEN Hui;

2010, 32(10): 18-20.

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The saturation of CT when it was faulted often causes the relay protection incorrect tripping. The saturation mechanism of CT and the secondary current characteristics of saturated CT were analyzed. According to the wavelet Mallat algorithm, a CT saturation detection method based on the wavelet theory was put forward. In this method, the wavelet Mallat algorithm was used to extract the low frequency energy and the high frequency energy of the secondary current, and their ratio is used as criterion for CT saturation detection. PSCAD/EMTDC simulation result shows that under various faults, the method can correctly detect whether the CT is saturated; the method has stable performance, and only lesser data were needed for the detection.

Simulation and optimization of CO2 removal system using MEA absorption in coalfired power plant

ZHUANG Rong;LIANG Haiwen

2010, 32(10): 21-24.

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Capturing CO2 from flue gas using monoethanolamine (MEA) absorption is a relatively mature technology at present. However, the existing problems, such as the high energy consumption in regeneration, hinder its largescale application in coalfired power plant. Thus, it is necessary to optimize the CO2 removal process flow to lower CO2 capture cost. Taking the CO2 removal system of a 430MW unit as research object, using ASPEN PLUS simulation software, the flue gas CO2 removal process with the MEA absorption in coalfired power plant was simulated. The CO2 removal process flow and some important parameters, such as the CO2 loading of lean solution, the pressure of the regeneration tower, the inlet temperature of the regeneration tower and the CO2 captured rate, were optimized. The simulation result shows that rational optimization can decrease the energy consumption and the material consumption in regeneration and then reduce the CO2 removal cost. The comparison of the simulation results with the results of published literatures shows that the result data of the CO2 removal system obtained by ASPEN PLUS simulation were exact and reliable. 

Application of automatic generation control function in 300MW CFB unit

DAI Huasong

2010, 32(10): 25-27.

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The functions of AGC and the control scheme of the unit coordinative control system (CCS) were introduced. The coordinative control strategy, which is adopted in 2×300MW domestic subcritical CFB unit in Shaoguan Pingshi Power Plant for raising the AGC operation rate and optimizing the AGC adjustment quality, was provided. The practical operation shows that the month operation rate of the unit AGC is 99.3%, and the adjustment quality of the AGC can basically satisfy the requirements of the power grid; so the automation level of the whole unit was raised. 

Theoretical analysis and calculation of deep reducing outlet gas temperature of power boilers

HUANG Xinyuan;SUN Fengzhong

2010, 32(10): 28-30.

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The concept of deep reducing the outlet gas temperature was introduced. The internal relation between the deep reducing the outlet gas temperature and the chimney corrosion prevention was analyzed. The evaluation of the additional cold source loss of the steam turbine in the deep energysaving system was discussed; and the key technology of heating surface corrosion prevention design was researched, here the corrosion is caused by the lower outlet gas temperature. It was pointed out finally that the scheme of deep reducing outlet gas temperature must be formulated according to the practical situation of the unit to get the maximum of the increased electricity.

Application of fieldbus control technology in auxiliary shop of power plant

MA Yumin;WANG Lianshu

2010, 32(10): 31-33.

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According to the current practical application situations of the control systems in thermal power plant auxiliary shops, the characteristics of different control systems in auxiliary shops were analyzed. The fieldbus control system was compared with the traditional distributed control system (DCS) and the programmable logic controller (PLC) control system. Taking the boiler makeup water treatment system as an example, the control scheme of fieldbus control system based on PLC was put forward, and its technical economical analysis was carried out.

Development and application of energyloss analysis system for coalfired generator unit

ZHU Binshuai

2010, 32(10): 34-36.

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The basic principle of energyloss analysis and the data processing methods, such as the equivalent enthalpy drop method, the heat deviation method and the thermodynamic method, were expounded. Based on these, a realtime online energyloss analysis system was developed. The application of the system in a power plant shows that the system can raise the unit operation and management level effectively. 
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Reasons analysis and treatment of rotor isolation deterioration of hydroelectric generator

ZHU Yueliang

2010, 32(10): 37-39.

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The type and reasons of the grounding faults of generator rotor in the Huaguangtan Cascade Hydropower Stations were analyzed. The reasons of repeatedly occurred grounding faults were discussed emphatically, and relevant solving methods were put forward, providing reference for similar problem treatment of the same hydroelectric generator set.

Selection of annual fixed charge rate of thermal power plant

LI Lei

2010, 32(10): 40-42.

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Starting from the basic principle of the annual cost method, according to the analysis of the annual cost composition, the more rational calculation method of the annual fixed charge rate was deduced. Some revising suggestions on DL/T 5339—2006 “code for hydraulic design of fossil fuel power plants” were put forward.

Experience of 600MW generator overhaul in a power plant

YANG Chengyu

2010, 32(10): 43-45.

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The check item, the test item and the existed problems in the 600 MW generator overhaul of a power plant were introduced. The reasons of the problems were analyzed; the relevant treatment methods were given; so the security of the generator operation was enhanced.

Analysis on tripping of main transformer in 220kV substation

ZHANG Fen

2010, 32(10): 46-47.

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In a 220kV substation, a short circuit fault of a capacitor set in low voltage side of the main transformer was occurred. Great amount of conductive smoke dust, which was produced by the short circuit fault, whisked into the switch cabinet near the main transformer low voltage side, and the cable of the CT difference current circuit in main transformer low voltage side was burned away, and the differential protection of the main transformer was tripped. The reasons of the whole accident were analyzed, the preventive measures were put forward, and the power supply reliability of the main transformer was raised effectively. 

Analysis on reasons of governor faults and treatment measures

MIAO Xinjian

2010, 32(10): 48-49.

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Some faults occurred in beginning of operation of a power plant, which include that the linear displacement convertor was jammed, the temperature of the servo motor in shut down automation mode was higher, and the guide valve piston of governor was dropped. The reasons of these faults were analyzed, and the solving methods were given.

Monitoring of equipment noise in thermal power plant and noise reduction measures

WANG Benjun;ZHAI Shenhui;SONG Xiaodong;CUI Qingjie

2010, 32(10): 50-54.

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Taking a 300MW thermal power unit as example, based on the field monitoring data, the reasons of the noise of main equipments were analyzed, the noise control was discussed, and relevant treatment measures were given.

Hoisting scheme for dismantling steam drum of 600MW unit

ZHOU Pingyuan

2010, 32(10): 55-58.

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In the boiler steam drum dismantlement engineering of the Zhanjiang Orimusion Power Plant, the steam drum is required to be reused after dismantled. The size of the drum is about 27.0m×4.0m×3.5m（length × width × height）, the hoisting weight is about 2400kN. The steam drum dismantlement hoisting scheme and the technical requirement were introduced. The methods of load computation, the design of the hoisting equipment, the strength check and the stand column stability check were given. After the scheme was implemented, the hoisting task was finished successfully.

Application of energyloss analysis in energy conservation management

YANG Xuhao

2010, 32(10): 59-62.

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Taking a 200MW unit as example, the definition, the calculation principle of the energyloss analysis and the determining method of its calculation model were introduced. The influence of the application of energyloss analysis on the unit economical efficiency was analyzed, and the way for enterprise to save energy and reduce consumption was pointed out.

Calculation of coal fired unit's carbon emission and strategy of energysaving power generation dispatching

LIU Jinxiong

2010, 32(10): 63-67.

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A method for calculating the indicators of carbon emission of each unit using existed data in power plant was put forward, and the difficult problem of indicator calculation of carbon emission for several units with different parameters and commonused chimney was solved. According to the idea of energysaving power generation dispatching, a strategy of energysaving power generation dispatching based on the carbon emission indicators was put forward, which can ensure the carbon emission of the area power grid to be least.

Analysis of factors influencing on desulphurization efficiency

LI Jiang;PENG Yizao;ZHANG Aimin

2010, 32(10): 68-71.

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The limestonegypsum wet desulphurization process was introduced. The main factors influencing on the desulphurization efficiency were analyzed. The relevant measures were adopted, and the operation parameters of the desulphurization system were controlled in appropriate ranges, so the desulphurization efficiency reaches the target specified by related standard.

‘Small’ and ‘excellent’ of biomass energy power plant

ZHANG Jin

2010, 32(10): 72-75.

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The site selection, the arrangement and other problems of conventional strawfired power plant were analyzed with examples. The relation between the main plant area and straw storage yard was expounded. The methods to simply the auxiliary and ancillary facilities were put forward. All these can be used as reference for site selection and arrangement design of strawfired power plant.

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