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Zhuhai, China

Zheng K.,Jilin University | Zheng K.,Jilin Institute of Architecture and Civil Engineering | Xu D.,Jilin University | Shao H.,Zhuhai Power Plant | And 2 more authors.
China Welding (English Edition) | Year: 2011

The martensite SA213-T91 and bainite SA213-T23 high-temperature resistant steels were applied to the heating surface of the ultra supercritical thermal power unit boiler. The weld metal microstructures and welded joint performance between the two kinds of dissimilar steels were analyzed. The main reasons of the welding defects such as hot crack, cold crack, brittleness and decrease in toughness were discussed during the welding of the dissimilar heat-resistant steels of SA213-T91 and SA213-T23 in boiler manufacturing and processing operation. The welding materials were chosen and welding procedure was made according to the base metals. Copyright: © 2011 Editorial Board of CHINA WELDING. Source


Zheng K.,Jilin University | Zheng K.,Jilin Institute of Architecture and Civil Engineering | Xu D.,Jilin University | Zhang X.,Zhuhai Power Plant | Xie F.,Zhuhai Power Plant
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2010

Two kinds of heat-resistant steel, T91 and TP347H-overseas production ferrite SA213-T91 (domestic GB5310-T91) and overseas production austenite SA213-TP347H, are applied to the reheater, the superheater, the economizer, the main steam pipeline and the header of boiler heating surface, which the boiler withstands the supercritical pressure and the ultra 570°C high temperature in manufacture and installment first-phase 2×600 MW coal-fired generating units in China-HK (Hong Kong) joint project through the Zhuhai Power plant. The metal characteristics and welding performance of the two kind steels are analyzed, and the primary factors of producing crack, corrosion and embrittlement flaw in the boiler production and the movement process are determined by experiments, and the craft evaluation of the parent metal and the welding material has carried out by using the corresponding craft measure. The fine weld joints are obtained, which will promote the using of the T91 and TP347H heat-resistant steel in the manufacture of the promotion (ultra) supercritical pressure thermal power unit boiler. Source


Tian D.,Huazhong University of Science and Technology | Zhong L.,Zhuhai Power Plant | Tan P.,Huazhong University of Science and Technology | Ma L.,Huazhong University of Science and Technology | And 4 more authors.
Fuel Processing Technology | Year: 2015

In the present paper, computational fluid dynamic modelings were established to research a newly presented re-heat steam temperature deviation solution on the basis of FLUENT 6.3.26 considering a 700. MWe tangentially fired pulverised-coal boiler, which confronted with severe flue gas and re-heat steam temperature deviation. The model was solidly validated by grid independence test and comparison with the experimental data obtained from a series of on-site measurements. Upon reliable validation, the model was further used to investigate the forming mechanism of re-heat steam temperature deviation as well as the influence of burner tilt angle on it. The conclusions mainly include (1) Residual swirling flow in the upper furnace caused the flue gas velocity and temperature deviations in crossover pass. For a typical anticlockwise tangential firing system, the flue gas velocity and temperature were lower in left part of crossover pass. The deviation of flue gas further generated the convective heat transfer imbalance of final re-heater, therefore, the temperature deviation of re-heat steam was severe. (2) Tilting the burner upward can effectively reduce the intensity of residual flow as well as the flue gas deviation degree. The +. 11° tilt angle of burner was relatively optimum considering the flue gas deviation and final re-heater overheating potential. Specifically, the intensity of residual swirl flow dropped 44% with burner tilting upward for +. 11°. Practical operation of boiler demonstrated that the reheat steam temperature deviation was reduced from 22. °C to 10. °C in this case. (3) When the tilt angle of additional air (AA) was bias set, the flow field of upper furnace was changed. Consequently, the residual swirl flow intensity and the flue gas deviation were reduced considerably. On-site measurements indicated that the combination of tilting burner upward for +. 11° and setting the bias of AA tilt angle for 10° can further reduce the re-heat steam temperature deviation to 4. °C. © 2015. Source


Tian D.,Huazhong University of Science and Technology | Fang Q.,Huazhong University of Science and Technology | Tan P.,Huazhong University of Science and Technology | Zhang C.,Huazhong University of Science and Technology | And 4 more authors.
Huagong Xuebao/CIESC Journal | Year: 2015

The burner tilting up and the bias setting of AA tilting up angle was employed in order to reduce the temperature deviation of flue gas and reheat steam. The combustion processes in a 700 MW tangentially fired boiler with different burner tilting up angles were numerically simulated. The simulated results were fitted in with the measured data well. For greater burner tilting up angle, the swirling momentum moment in the furnace and the residual swirling momentum moment in the entrance of platen zone were reduced, while the flue gas deviation in the horizontal flue gas pass was lower. The bias setting of AA burner tilting up angle can reduce the flue gas residual swirling momentum moment of the entrance of platen zone considerably and lower the deviation of the flue gas temperature and velocity. The combustion tests showed that as an effective measures to reduce the temperature deviation of flue gas and reheat steam of this boiler, the burner tilting up for 11° and the bias setting of AA tilting up angle for 10° can reduce the temperature deviation of reheat steam from 20℃ to about 4℃. ©, 2015, Chemical Industry Press. All right reserved. Source

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