Yan C.,Hohai University |
Zhao X.,Hohai University |
Tian S.,Hohai University |
Xu S.,Hohai University |
And 2 more authors.
Advanced Materials Research | Year: 2013
The welding temperature field of twin-wire submerged arc welding (SAW) in an X80 pipeline steel welded joint was analyzed using a three-dimensional (3D) finite element (FE) model. Taking into account nonlinear relationships between temperature and mechanical properties, a coupled thermo-mechanical FE solution was used to obtain the temperature distribution for varying set of welding conditions. Effect of welding speed, inter wire spacing on welding temperature field were studied and presented. It is found that welding speed and inter wire spacing play a significant role in deciding the temperature distribution of twin-wire submerged arc welding. Simulation results were well consistent with theoretical analysis. © (2013) Trans Tech Publications, Switzerland.
Yang Q.,Harbin Boiler Company Ltd. |
Tan S.-P.,Harbin Boiler Company Ltd.
Kang T'ieh/Iron and Steel | Year: 2014
The microstructure stability of alloy 617, which is one of candidate materials for high temperature component of advanced ultra supercritical coal fire generating unit, was investigated after aging 1000, 2000, 3000 and 5000h at 750°C. Optical microscope, scanning electron microscope, transmission electron microscope and X ray diffraction were used to analyze the intergranular and intragranular precipitates after aging. The results show that M23C6 carbide precipitates at grain boundaries; while the intragranular precipitate of γ' is dispersoid distribution, and the size increases with aging time. The strength of test material increases after 1000 h aging, and then the trend changes to smooth with aging time. And toughness of the test material decreases with aging time.
Li G.-L.,Dalian University of Technology |
Li C.-Y.,Harbin Boiler Company Ltd. |
Chen X.-Y.,Dalian University of Technology |
Zhang X.-W.,Dalian University of Technology
Wuli Xuebao/Acta Physica Sinica | Year: 2013
Choosing the current of the front inductor of SEPIC converter as controlled object, the resonant parametric perturbation is applied to control the chaos in SEPIC converter. Through the small perturbations of circuit parameter, chaos control of SEPIC converter is realized, and the results are analyzed by the time domain waveform, power spectrum, and bifurcation diagram. Finally, the results of the circuit experiment demonstrate that chaos control of SEPIC converter can be realized by the resonant parametric perturbation method. © 2013 Chinese Physical Society.
Yuan D.D.,Northeast Petroleum University |
Yuan B.B.,Harbin Boiler Company Ltd. |
Song H.,Northeast Petroleum University |
Niu R.X.,Northeast Petroleum University |
Liu Y.X.,Northeast Petroleum University
Advanced Materials Research | Year: 2014
In the one compartment electrochemical cell equipped with platinum electrodes electrochemical fixation carbon dioxide was conducted under ambient conditions. Ionic liquid BMimBr is supporting electrolyte. The aimed product dimethyl carbonate was electrosynthesized in a dialkylimidazolium ionic liquids-propylene oxide-methanol system under normal temperature and pressure. The result indicated that the highest yield of 37.8% was obtained in the condition of working temperature 30 °C, electrolytic voltage 5.5 V, the mass of CH3OH 0.484 mol, propylene oxide 0.052 mol and bmimBr 0.059 mol. © (2014) Trans Tech Publications, Switzerland.
Man Z.,Harbin Institute of Technology |
Rushan B.,Harbin Institute of Technology |
Zezhong Y.,Harbin Boiler Company Ltd. |
Xiaoguo J.,Harbin Boiler Company Ltd.
Powder Technology | Year: 2010
It is important to properly understand and calculate the distributions of the heat flux and the heat transfer coefficient in a furnace for designing a circulating fluidized bed (CFB) boiler, especially for one with supercritical parameters. An experimental study of the heat transfer in a commercial 300. MWe CFB boiler was conducted in this work. The heat flux from the bed to the waterwall was measured by a heat flux meter at four different heights. The influence of suspension density and bed temperature was analyzed by measuring the pressure profile and temperature profile in the furnace. In addition a numerical modeling study on the two phase flow in the furnace was carried out. The results indicate that the density of the solids suspension was non-uniform in the cross section at a certain height, and decreased gradually with increasing furnace height. Consequently, the distribution of heat flux in the horizontal plane was non-uniform and decreased along the height of the furnace. The heat flux showed a decreasing trend near the center. © 2010 Elsevier B.V.
Fengjun W.,Zhejiang University |
Ying H.,Harbin Boiler Company Ltd.
ICOPE 2015 - International Conference on Power Engineering | Year: 2015
Harbin boiler company (HBC) started the development of technologies for high-efficiency ultra-supercritical boilers in 2012 using its technologies and extensive operation experiences of many ultra-supercritical boilers. These technologies were applied to efficiently reduce the CO2 emission and operating cost of thermal power plants. In 2014, Huaneng Changxing 660MW high-efficiency ultra-supercritical boiler started operation, its unit efficiency was 46.035%, net coal consumption rate was ∼275g/kwh. Both values exceeded other standard ultra-supercritical boilers. As the boiler supplier, HBC is fully responsible for the boiler general performance design, manufacturing and commissioning supervision. This article presents the general conditions, design features and reliability run operating data with high-efficiency ultra-supercritical parameters of this project. © 2015 The Japan Society of Mechanical Engineers.
Wang S.,Harbin Boiler Company Ltd. |
Liu G.-X.,Harbin Boiler Company Ltd. |
Tan S.-P.,Harbin Boiler Company Ltd.
Kang T'ieh/Iron and Steel | Year: 2016
The relationship between the precipitation of M23C6 carbide and mechanical properties was investigated after the 650℃ aging process of Tempaloy AA-1. The microstructure and corresponding fracture surface under impact and tensile tests of the Tempaloy AA-1 with 0, 500, 1 000, 5 000 and 8 000 h aging duration were analyzed by scanning electron microscopy and transmission electron microscopy. The results show that the ocuurrence and distribution at grain boundary of M23C6 carbide were found, as the aging time of Tempaloy AA-1 increases. Due to the grain boundary strengthening, the Tempaloy AA-1 aged for 500 h showed a maximum yield strength and tensile strength. The obvious growth of M23C6 carbide at grain boundaries with increasing aging time to 8 000 h made grain boundary strengthening become weaken, resulting in a slight decrease of strength. There is no obvious reunion of M23C6 carbide after long time aging, as a result, the Tempaloy AA-1 material still has good ageing impact toughness. The good mechanical properties and impact toughness after aging is due to the good microstructure stability of Tempaloy AA-1 after long time aging. © 2016, Chinese Society for Metals. All right reserved.
Zhang D.-J.,Harbin Boiler Company Ltd. |
Yin X.-M.,Harbin Boiler Company Ltd.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010
Based on the existed domestic ultra-supercritical boiler technology, the necessity of developing and designing large capacity ultra-supercritical lignite-fired boiler is discussed. The basic design scheme of a 1000 MW ultra-supercritical lignite-fired boiler is presented, including the selection of coal and steam parameters, furnace type and main characteristic parameters, furnace waterwall, combustion and coal-pulverizing system, superheater, reheater and economizer system, temperature controlling method, start-up system, steel of pressure parts, etc.
Wang S.,Harbin Boiler Company Ltd. |
Liu G.,Harbin Boiler Company Ltd. |
Tan S.,Harbin Boiler Company Ltd.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015
Aging embrittlement of Tempaloy A-3 steel was studied by means of impact test after aging at 700 ℃, and microstructure and impact fracture of the steel aged at different time was analyzed by scanning electron microscopy and transmission electron microscopy, respectively. The results show that the aging embrittlement of Tempaloy A-3 steel is obvious, after aging for 1000 h, the impact absorbed energy decreases from 158 J(before aging) to 75 J, with aging time increasing, the impact absorbed energy decreases to 20 J (aged for 8000 h). The main fracture of aged Tempaloy A-3 steel is quasi-cleavage fracture. The main reason for the impact toughness degradation is due to precipitates located inside the grain as well as along grain boundaries. After long time aging, the grain boundary M23C6 aggregates and grows, and then σ brittle phase precipitates at transcrystalline. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.
Wang Y.,Xi'an Jiaotong University |
Wang J.,Xi'an Jiaotong University |
Jia P.,Harbin Boiler Company Ltd.
Heat Transfer Engineering | Year: 2011
A novel simulation model is developed for predicting the performance of forced convection heat transfer in the porous metal foam. Based on the physical geometry of the Gibson-Ashby constitutive model, the theoretical model proposed is able to predict the mechanical behaviors and thermal physical properties of porous materials simultaneously. The theoretical predictions of the overall heat transfer coefficient and pressure drop were compared with available experimental data for two different porous foam tubes. The first tube has a porous diameter of 0.6mm and porosity of 0.402, and the other tube has a diameter of 1.6mm and porosity of 0.462. The results show that the relative deviation of the flow pressure drop between the prediction and the experimental data are in the range from 5% to10% while the relative deviation of the overall heat transfer coefficient is about 20%. These deviations are acceptable for applications in engineering. So the feasibility of the Gibson-Ashby constitutive model to be used to predict the performance of flow resistance and convective heat transfer in porous foam ducts is satisfactorily validated. Copyright © Taylor and Francis Group, LLC.