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Tong J.,Anhui University of Technology | Pan Z.,Anhui University of Technology | Bao J.,Anhui University of Technology | Xu X.,Anhui University of Technology | Pan T.,Huatian Engineering and Technology Corporation
Applied Mechanics and Materials | Year: 2012

Aimed at the welding initial defect fatigue extension of 300t converter loop in a factory, the whole assembly finite-element (FE) model of converter loop with the welding initial defect is established. The converter loop FE model with different depth initial defect is computed by using 3D nonlinear finite element method at different tilting angles. And the stress intensity factor is extracted and analyzed under different working circumstances. The analysis results show that when the initial defect depth is greater than 11.715mm, the defect will result in fatigue crack extension at the complex alternating stress. To solve the cracking leakage problem of converter loop, the original welding manholes is replaced by the movable manhole. In the past over one year, the fatigue cracking and leaking phenomena did not occur in the converter loop, so the effect is obvious. © (2012) Trans Tech Publications, Switzerland. Source

Xu J.-L.,Northeastern University China | Zhang J.,Huatian Engineering and Technology Corporation | Shi Z.-N.,Northeastern University China | Gao B.-L.,Northeastern University China | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

Extracting aluminum from aluminum alloys in AlCl3-NaCl molten salts was investigated. Al coating was deposited on the copper cathode by the method of direct current deposition using aluminum alloys as anode. The purity of the deposited aluminum is about 99.7% with the energy consumption of 3-9 kW·h per kg Al, and the current efficiency is 44%-64% when the deposition process is carried out under 100 mA/cm2 for 4 h at 170 C. The effects of experimental parameters, such as molar ratio of AlCl3 to NaCl, cathodic current density and electrolysis time, on the current efficiency were studied. The molar ratio of AlCl3 to NaCl has little effect on the current efficiency, and the increase of deposition temperature is beneficial to the increase of current efficiency. However, the increase of current density or electrolysis time results in the decrease of current efficiency. The decrease of current efficiency is mainly related to the formation of dendritic or powder deposit of aluminum which is easy to fall into the electrolyte. © 2014 The Nonferrous Metals Society of China. Source

Li J.-C.,Central South University | Li J.-C.,Huatian Engineering and Technology Corporation | Bai G.-H.,Central South University | Li G.-H.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011

The balling and reducing experiments of carbon-bearing chromite fines were carried out in laboratory. The effects of reduction temperature, amount of carbon, reduction time and types of additives on the metallization of carbon-bearing chromite pellets were investigated. The results show that the reductivity of carbon-bearing chromite pellet is greatly influenced by the reduction temperature and C/O mole ratio. At the temperature above 1200 °C, the metallization of prereduction pellet begins to increase obviously, and IC/O = 1.2 is better for the prereduction of chromite pellet. The fast reduction of carbon-bearing chromite pellet can be achieved at high temperature (≥1300 °C); but it needs 3-4 h to finish the reduction reaction at low temperature, and the reduction reaction of iron is easier than that of chromium. The intensifying reduction of carbon-bearing chromite pellet with the help of additives was studied. The results indicate that different additives have great difference in the influence of reduction reaction, and the catalytic property of the same additive also has some difference at different reduction temperatures. For all involved additives in the experiment, NaCl, Na2B4O7·10H2O and Na2CO3 have excellent catalytic performance. Source

Ye Y.-L.,Jiangsu Maritime Institute | Si F.-Q.,Nanjing Southeast University | Xu Z.-G.,Nanjing Southeast University | Jiang W.-H.,Huatian Engineering and Technology Corporation
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2016

Due to the special properties of blast furnace gas (BFG) and the resulting different settings for the boiler heating-surface, along with the measurement difficulty of quantifying fuels entering furnace, the method for calculating and correcting the thermal efficiency of boiler mixedly burning pulverized coal and BFG is different from the traditional way. Based on GB10184-1988《 Performance test code of utility boiler》, a calculation and correction model for the thermal efficiency of mixedly-burned boiler was put forward. It takes into account the properties of fuel and the setting characteristics of the boiler tail heating surface. The results can provide reference for the thermal efficiency test and calculation of such boiler. © 2016, Harbin Research Institute. All right reserved. Source

Jia D.,Hohai University | Jia D.,Anhui University of Technology | Cao P.,Hohai University | Jiang D.,Huatian Engineering and Technology Corporation | Chen X.,Huatian Engineering and Technology Corporation
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

Field test is performed for the regular polygon prism shell of a 300, 000 m 3 gasholder. The curves of deflection and strain of the ring beam, column, and ribbed plate are presented. The force characteristics and interactive behavior of the beam, column and plate are analyzed using a FEM model. The results from simplified formulas and the FEM analysis are in good agreement with the test data. The study shows that, to simplify design, the ring beam may be regarded as fixed support for the column, the column and the partial side plate as elastic foundation beam, the ribbed plate as wide-flange beam supported on the column with shear lag, and the wall plate as continuous plate supported on the horizontal rib. It is feasible to establish a quarter FEM model of the gasholder shell for design analysis. The simplified analysis, treating the gasholder shell as a planar structure system, is applicable. Source

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