Integrated Intelligent Energy

Development of ultra-supercritical power generation technology in China

ZHU Bao-tian;ZHAO Yi

2008, 30(2): 1-5.

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The research of ultra-supercritical power generation technology was introduced, especially State Development and Reform Commission significant project “research of 600 MW supercritical thermal power unit” and 863 plan (“Tenth Five-year Development Plan”) ”ultra-supercritical coal-fired power generation technology”. Research results of the two projects realized leap development of ultra-supercritical coal-fired power generation technology. Further more, present situation of generating set manufacturing industry and development scale of ultra-supercritical units were introduced, and the leading direction in coal-fired power plant in China was pointed , which is the ultra supercritical electricity generation technology.

Discussion of the 600MW supercritical unit design optimization

CHEN Qiao-wei;WANG Jun-qi

2008, 30(2): 6-10.

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In view of 2×600 MW supercritical units, optimized schemes for the problems accrued in oil system, main equipment appendix, draining system, and auxiliary system were put forward, which is sure to keep safe, economical, reliable and environmental performance. Meanwhile the problems occurred in vacuum pump, circulating pump and other important auxiliary equipments that putting into production were analyzed, and related advice was supplied.

Design characteristic analysis of steam-water system for ultra-supercritical unit

CHEN Rui-ke

2008, 30(2): 11-16.

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Project and system situation in Zouxian Power Plant were introduced, and the piping design parameters and the piping material of main steam system and main feed water system were determined. The design characters of steam and water system in 2×1000 MW ultra supercritical unit were analyzed.

Practice and application of energy consumption analysis system on CFB heat supplying unit

ZHAO Xue-shan;SUN Wei;DIAO You-feng;GUO Yong

2008, 30(2): 17-21.

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The structure and function of energy consumption analysis system on CFB heat supplying unit in Zibo Cogeneration Co., Ltd were introduced. Taking use of real-time data and associated with CFB boiler running characters, unit coal consumption can be calculated, key factors which influence coal consumption and the elaborate factors which effect boiler efficiency, steam turbine heart consumption and self-service consumption ratio can be analyzed which the result can guide the unit operation. In order to proven accuracy of the system, more research work is carried out in several parts: the relation of bed temperature control with boiler efficiency, economical character adjusting basis of cogeneration unit and energy saving evaluation criterion, operation evaluation indexes system and so on. Practices show that: the coal consumption of #3, #4 units is decreased, and the unit operating economics efficiency is improved with using this analysis system .

Intensity analysis of reheat steam pipeline hot pushed elbow for ultra supercritical units

LIU Xue;BAI Shao-tong;ZHANG Dong-li;CHEN Jun-li;SHI Xiang-bin

2008, 30(2): 22-25.

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Finite element analysis method is taken to analysis the reheat steam pipeline elbow heat stress in ultra supercritical unit, which the results showed that, under the intrinsic pressure load, the higher stress fields focus on intrados surface inside arches place, while outside arching place and other places have lower stress. The highest stress filed appeared corner place 25°～35°of inner arching. therefore, the design of elbow inner arching thickness is very important, and the results provided theory basis for the structure design of elbow.

Stress analysis of exhaust steam piping for direct air-cooling power plant

LI Guo-dong;MA Jun-biao;LIU Xue;CHEN Jun-li

2008, 30(2): 26-28.

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Based on thee basic theory of piping FEM, stress analysis of the exhaust steam piping of Shuozhou Geruite ACC Power Plant has been discussed in this paper. Dead weight, thermal expansion, seismic loads, winds and foundation settlement have been considered according to relevant codes. Piping has been analyzed under necessary combined load cases.

Exploration of the waste heat boiler technology on IGCC power generation

ZHUANG Guang-quan

2008, 30(2): 29-33.

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The waste heat boiler is key equipment in gasification unit of IGCC power plant. The whole system efficiency can be improved by adopting the waste heat boiler to recover the heat of syngas. The waste heat of the boiler has three characteristics, high temperature, high pressure and strong reduction. Some problems must be pay more attention to solve , such as temperature corrosion, seal, and slag discharge for The radioactive waste heat boiler and fouling, plug and wear for the convection waste heat boiler .The key issues for research and design of waste heat boiler were summarized and analyzed, and the related methods were proposed.

Application of finite element method in the analysis of blade fracture

LEI Ling-bo;LIU Ming-jie;WANG Bao-lin

2008, 30(2): 34-38.

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In view of the 330MW subcritical condenser steam unit with single intermediate reheat, four cylinders and quadruple flow, the large-area cracking problem on the 4th-stage blade of LP rotor was analyzed. Main factors contributing to the vibration response and dynamic stress of blades were discussed. With the vibration model, the vibration features and dynamic stress were calculated. The result showed that the blade fracture was mainly caused by the defective design in blade vibration characteristics.

Non-flexible metal seal modification of 670MW supercritical once-through boiler

SUN Zheng-rui

2008, 30(2): 39-41.

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670 MW supercritical once-through boiler roof adopts twice sealing forms, and guard plate material is heat-resisting, anti-corrosive, ductility material. However, due to the oversized ceiling area and complex expansion, guard plate is easily to be ripped; besides, the heat-resisting plastic and refractory castable material will become loose due to heat, which will lead to flue emission. In order to solve the problems and increase the boiler efficiency, on the base of twice sealing forms, environmental nonmetallic three-dimensional flexibility seal technology is adopted, and the boiler furnace top seal situation is modified. It is not only solving flue gas leakage, ash leakage ,but also improving boiler efficiency and unit operation environment.

Transformation and application of 480 t/h CFB boiler induced fan inverter

LI Wei-guo;LI Ben-guo;GUO Ya-feng

2008, 30(2): 42-45.

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The induced fan efficiency of 150MW CFB boiler in Huadian Wuda Cogeneration Plant was low, and the fan had other disadvantages such as high starting current, high rotational speed and high bearing temperature, which would lead to high auxiliary power rate. Therefore a transformation scheme was proposed that installing inverter in view of the present problems. After the transformation, the energy saving effect was significant, which improved equipment operating situation and extend equipment service life.

Research and analysis on DG410 t/h CFB commissioning

MA Deng-qing;YANG Shou-wei;LIU Ya-jun;LI Shi-jun

2008, 30(2): 46-49.

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CFB; boiler; commissioning

Analysis of and countermeasures against tube explosions of ultra-supercritical boiler during commissioning

SHAO Tian-you

2008, 30(2): 50-53.

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The boiler parts interior in the fist 1000MW ultra-supercritical units are not clean enough and for other reasons, which it is easy to block the tubes, and the tubes are exploded during commissioning. After analyzed the causes of #1 unit several tubes exploded, the method that installing the orifice ring in the pipe interior so as to get the balance of water and substance speed was implemented. Further more, by adopting checking the cleanness of header and pipe interior, which decreased the tube explosion phenomenon, and enhanced the unit security.

Familiar malfunction and disposal of booster fan in large capacity units

WANG Xin-ge;KONG Lin;CHEN Cai-liang

2008, 30(2): 54-58.

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With the increment of desulphurization projects, how to ensure the stable operating of large capacity desulphurization equipments is getting more attention. Familiar malfunction of the desulphurization booster fan was introduced in view of 2×600 MW units(project iii ) and 2×1000 MW units(project iv) in the Zouxian Power Plant during commissioning. The malfunction problems were analyzed from the design, the installment, the operating and the overhaul. The corresponding processing measures were taken, which avoided the accident.

Earth fault analysis of direct current system

LI Run-ping;WEN Quan

2008, 30(2): 58-61.

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The causes of the direct current system earth faults were discussed, the harm of direct current deuce earth was analyzed, while the working theory, technical parameters and performance index of portable LT-2000A were introduced. On base of the understanding of direct current system, keeping mastering utilization method of the stationary insulation detector equipment and LT-2000A, which is an important way to correctly check and deal with the faults of direct current system.

Improvement on measuring system on primary air flow of coal mill

TAN Jie

2008, 30(2): 62-63.

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After the unit put into production, auto adjusting equipment of primary air flow of coal mill could not run normally. By improving the measuring system of primary air flow, the system could run normally . The special air flow measurement instrument was introduced from the point of choosing air flow measurement equipment, and the transformation experience was summarized.

Research on improvement of bulb flow through type hydropower station excitation system

LI Yi-ping

2008, 30(2): 64-66.

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Xiaoxiang hydropower station excitation system was put into operation in May 2002 with #1 unit run. With the time going, its control performance and stable became worse. In order to keep speed with the power system development tendency and improve economical benefit, the comprehensive transformation scheme to 2 units was carried out, and the results were satisfied. By analysis and comparison of present problems, technical transformation schemes and transformation results, the transformation experience was summarized. The remained problems after excitation system transformation was pointed and relevant advice was presented.

Choice of FC circuit high voltage contactor time limit current quick break protection value

HAN Ling-zhu

2008, 30(2): 67-69.

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By calculating the fault current of 6kv system FC circuit in power plant, and analyzing the ampere-second characteristic of NT type high voltage fuse, while considering the current characteristics when the high voltage motor started, stopped because of blockage, and bearing blocked, the choice method of FC circuit high voltage contactor time limit current quick break protection value was supplied.

Water-saving effect analysis before and after water balance experiment

QIN Li-xin;ZHANG Jian-fu;WU Tao

2008, 30(2): 70-73.

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In view of water drainage problems occurred during the water balance experiments in Xinjiang Hongyanchi Power Plant, the causes was analyzed, and detailed water saving schemes to deal with sewage of cooling tower, district heating system draining water, and draining water in ash removing system were supplied. After the transformations, the circulating water concentration ratio was enhanced significantly, while the water consumption decreased.

Research on PWM rectifier suitable for direct-drive wind power system

LI Jian-lin;PAN Li-qing

2008, 30(2): 74-77.

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The diode-clamped three-level rectifier which is suitable for Direct-drive wind turbine system is presented, the operating mode of the rectifier is analyzed, and a SVPWM control method which is based on the average model of PWM rectifier and tracked instruction voltage vector is derived in detail. The simulation results show that the harmonics is suppressed effectively, the distortion of AC current waveforms is decreased, the power factor can be adjusted, and the bi-direction flowing of energy is implemented.

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