Huatian Engineering and Technology Corporation


Huatian Engineering and Technology Corporation

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Qian P.-B.,Huatian Engineering and Technology Corporation | Qian P.-B.,Nanjing University of Science and Technology | Qian L.-F.,Nanjing University of Science and Technology | Yin X.-C.,Nanjing University of Science and Technology
Journal of Vibroengineering | Year: 2017

This paper reports on the improvement of Craig-Bampton (CB) method for transient analysis of structures with large-scale plastic deformation. As is known, the CB method is effective and accurate in reduced order modeling for linear system. In contrast to this, an improved CB method using tangent modes for nonlinear dynamic analysis has been developed. To do this, the incremental governing equations of nonlinear system are linearized in each time step by using tangent stiffness matrix, and the corresponding tangent modes are proved to be orthogonal with respect to mass matrix as well as with respect to tangent stiffness matrix by incorporating the elastic-plastic material behavior. Thus, the tangent modes can be used to assemble the transformation matrix of CB method in nonlinear dynamic analysis. Using the proposed method, two elastic-plastic beams loaded impulsively are examined. Simulation results show that the improved CB method is valid and accurate for transient analysis of structures with large-scale plastic deformation and has lower computational cost compared with full order model. © JVE INTERNATIONAL LTD.

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.

Xu J.,Northeastern University China | Zhang J.,Huatian Engineering and Technology Corporation | Shi Z.,Northeastern University China
High Temperature Materials and Processes | Year: 2013

Extracting aluminum from aluminum alloys in AlCl3-NaCl molten salts was investigated in this paper. The influences of experimental parameters such as electrolyte composition, cathodic current density and electrolysis time on the deposits morphology were discussed. The results show that the grain size of the deposits decreases with the increase of AlCl3 content in the electrolyte. Current density has a big effect on the morphology of the deposits. The particle size of deposits increases with the increase of current density, and dendritic morphology forms at high current density. High nucleation rates are achieved at high current densities above the limiting diffusion current density, and will result in a finer grain size. A non-dendritic deposit of aluminum was obtained at 170°C at 50 mA cm-2 cathodic current density for 1 h in the electrolyte having a 1.3 molar ratio of AlCl3/NaCl. The purity of the aluminum deposit is about 99.79% analyzed using inductively coupled plasma.

Chen P.,Changzhou University | Li W.-Y.,Changzhou University | Yao L.-R.,Huatian Engineering and Technology Corporation | Cheng H.-F.,Huatian Engineering and Technology Corporation | Zhang W.-Y.,Changzhou University
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2015

Didodecyl γ-biquaternary ammonium salt (DBAS) was synthesized from di-methyl-dodecylamine and epoxy chloropropane by one-step processs. The effects of DBAS dosage, pH value, water temperature and antibacterial time on the sterilization efficiency of heterotrophic bacteria were investigated. The results showed that its sterilization rate was above 90% in 10 h when the dosage was 10 mg/L, pH value from 6 to 9 and water temperature from 25℃ to 45℃. The main anti-bacterial mechanism was that by adsorption, netting and bridging, heterotrophic bacteria were flocculated with DBAS, which made local drug concentration increase to cause the death of bacteria. Both positively electricity quaternary ammonium N+ groups and -OH made DBAS in water adsorb to the surface of heterotrophic bacteria more easily. Two hydrophobic groups of -C12H25 and the hydrophilic groups penetrated into the lipid and protein layer inside the membranes of heterotrophic bacteria cells, modified them, and killed heterotrophic bacteria finally. ©, 2015, Science Press. All right reserved.

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.

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.

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.

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.

Zhang W.-Y.,Changzhou University | Li W.-Y.,Changzhou University | Feng G.-Y.,Changzhou University | Liu F.,Changzhou University | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2014

Water-soluble quaternary ammonium polymer, poly[oxyethylene (dimethylimino) ethylene-(dimethylimino) ethylene dichloride] (PODEDED), was synthesized by polymerization reaction between tetramethylethylenediamine and bis-(2-chloroethyl)ether as raw materials. The effects of PODEDED dosage, pH value, water temperature and anti-bacterial time on the sterilization efficiency of heterotrophic bacteria were investigated. The result showed that the anti-bacterial rate could reach 99% under the conditions of dosage at 60 mg/L, anti-bacterial time 8~24 h, pH 5~10 and water temperature 30~45°C. The anti-bacterial mechanism was that hydrophobic and hydrophilic groups in long chain alkyl and positive electricity quaternary ammonium N+ groups of PODEDED entered deeply into lipid layer and protein layer of heterotrophic bacteria membrane, leading to destruction of the plasma membrane which controled cell infiltration, and resulting in leakage of intracellular substances and killing of heterotrophic bacteria. PODEDED could be widely used in killing heterotrophic bacteria in various open circulating water systems, sewage treatment and reuse systems.

Yang Y.,Huatian Engineering and Technology Corporation | Liu F.,Anhui University of Technology | Chen Q.-W.,Anhui University of Technology | Yang S.-B.,Anhui University of Technology
Journal of Iron and Steel Research | Year: 2015

On-line quenching and self tempering is the advanced technology in the production of large bars. Considering the latent heat of phase transformation and the changes of thermal physical properties of material with temperature, the temperature fields of online quenching and air cooling process after rolling of large diameter bars (more than 50mm in diameter) of 45 steel and 42CrMo with different specifications were simulated with the finite element software MSC. Marc. The critical cooling speeds of quenching were calculated to obtain the maximum depths of hardened layers of bars with different diameters and the related hardening time needed for forming maximum depth of hardened layer. The temperature fields of the bars after different quenching time were studied, meanwhile, the possibility of self-tempering was analyzed.

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