East China Engineering Science and Technology Co.
East China Engineering Science and Technology Co.
Wang J.,Hefei University of Technology |
Wang W.,Hefei University of Technology |
Hu Y.,East China Engineering Science and Technology Co. |
Tu L.,Huahui Construction Group Co.
Progress in Steel Building Structures | Year: 2015
To study the mechanical behavior and failure mode of semi-rigid beam-to-column connections for concrete filled steel tube (CFST) frames, a nonlinear finite element (FE) model is established for the end plate connections between CFST columns and steel-concrete composite beams using ABAQUS software. This FE model accounts for material nonlinearity, geometric nonlinearity and complex contact properties. The constitutive model of core concrete in steel tube and slab concrete, and complex contact relations of components are proposed. The horizontal load-displacement curve of the column and the failure mode of composite joints are analyzed. The analysis results are validated through comparing with test results. With a large number of parametric studies, the critical parameters affecting the ultimate load bearing capacity and initial stiffness of joints under positive or negative moments are summarized. The results show the FE model of end plate connections between CFST columns and steel-concrete composite beams has good accuracy, so it can provide a reference for theoretical studies of semi-rigid connected composite frame with CFST columns. © 2015, Progress in Steel Buiding Structures All right reserved.
Zhang S.-Y.,Xi'an Jiaotong University |
Zhang X.-H.,East China Engineering Science and Technology Co.
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011
The current paper presents the results of numerical study on the shrinkage property of synthetic fiber reinforced cement mortar, including the discussion about the influence of fiber geometry on the shrinkage performance of mortar matrix. Finite element method (FEM) was used to build the numerical models respectively for the free composite and constrained composite. Cooling method was used to simulate the shrinkage of mortar matrix. Based on the thermal-mechanical coupling analysis, shrinkage and average normal stress of the matrix were obtained. Examples show that increasing fiber volume fraction can take effects both on the decrease of shrinkage and average normal stress of mortar matrix. Although X-type fibers with elastic modulus higher than the matrix can provide better antishrinkage property for free mortar, they will increase the average stress in the constrained mortar and thus increase the possibility of original micro-cracks in mortar matrix. X-type fibers with elastic modulus lower than mortar, rather than cylindrical fibers, are suggested for a better achievement in antishrinkage and cracking control. © 2011 IEEE.
Li W.,Tianjin University |
Shi L.,Tianjin University |
Yu B.,East China Engineering Science and Technology Co. |
Xia M.,Tianjin University |
And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2013
In this work, the pressure-swing distillation process is extended to separate the pressure-insensitive binary azeotropes by using suitable entrainers. Design and control of new pressure-swing distillation for separating pressure-insensitive maximum boiling phenol/cyclohexanone azeotrope using acetophenone as a heavy entrainer are investigated using Aspen Plus and Aspen Dynamics. Rigorous steady-state simulations are run for both fully and partially heat-integrated processes and a comparison of these two configurations is made. It is revealed that the partially heat-integrated process is more competitive than the fully heat-integrated one from the economical viewpoint. Two temperature control structures and one composition/temperature cascade control scheme are proposed to handle the feed flow rate and feed composition disturbances. It is indicated that the column operating at higher pressure cannot be perfectly controlled by the two temperature control schemes because of the existence of an intermediate nonkey component. A composition/temperature cascade control structure is proposed to cope with this control problem and a robust control is achieved. © 2013 American Chemical Society.
Ye Y.,East China Engineering Science and Technology Co. |
Qian J.,Tianjin University |
Xu Y.,Tianjin University
Journal of Polymer Research | Year: 2011
This paper presented a model study on maleic anhydride (MAH) grafted polypropylene (PP) performed in melt state through ultrasonic initiation without any chemical initiator and solvent. The structures of PP-g-MAH were characterized by FTIR and 13C NMR and the mechanism were discussed. The graft degree (G) was determined by titration using a solution of organic base tetra-butyl ammonium hydroxide (TBAOH) in ethanol, and the effects of ultrasonic intensity, MAH concentration and styrene (St) on G and graft efficiency (G E ) of MAH were investigated. Results showed that MAH was successfully grafted onto the PP chain and the optimum conditions for grafting were at an ultrasonic intensity of 300 W with a MAH concentration of 25 wt.%, and the maximum G of MAH of 3.34 wt.% was obtained when the molar ratio of St to MAH was 1:1. DSC and XRD were also employed to determine the thermodynamic performance and crystalline structures of the products. © 2011 Springer Science+Business Media B.V.
He X.-T.,Tianjin University |
Gan A.-H.,Tianjin University |
Gan A.-H.,National Engineering Research Center for Distillation Technology |
Zhou Z.-S.,East China Engineering Science and Technology Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2011
This paper adopts PRO/II developed by SIMSCI company to simulate aromatic extraction process in the practical production, to design, simulate and optimize pre-fractionator, extraction distillation tower, solvent recovery tower, benzene tower, toluene tower and xylene tower, espectively, then to optimize total technological process and give the simulation results. The optimum process operation parameters are finally obtained, which comply with the national quality requirements.
Kang T.-T.,Zhejiang University |
Wang L.,East China Engineering Science and Technology Ltd |
He Y.-Y.,Zhejiang University |
Sun F.-Q.,Zhejiang University |
Wu W.-X.,Zhejiang University
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2016
In this study, the effects of the operational parameters on the performance and practical application of the acclimated DPAO sludge using nitrite as electron acceptor were investigated. The results showed that anaerobic-anoxic-aerobic process was highly effective for the enrichment of nitrite-based DPAOs. Besides, a step increase of nitrite concentration in the feed was beneficial to improve the nitrite tolerance of DNPAOs. Practical application suggested that DPAO process was feasible for the post-treatment of UASB-SFSBR effluent during the piggery tail wastewater treatment. When the influent concentration of NO3 --N, NO2 --N and PO4 3--P were 5,70,30mg/L, respectively, the effluent could reach down to nearly 0of NO3 --N and NO2 --N, and less than 1.0mg/L of PO4 3--P. © 2016, Editorial Board of China Environmental Science. All right reserved.
Ke G.-L.,East China Engineering Science and Technology Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015
The deep purification and utilization process of coke oven gas and converter gas in China are briefly introduced by taking the production of ethylene glycol from coke oven gas and converter gas as examples. A comprehensive analysis about the investment, technical and economic aspects is performed. It can provide some guidance for the steel plants in China with the clean utilization of coke oven gas and converter gas. ©, 2015, China National Chemical Information Center. All right reserved.
Huang W.,East China Engineering Science and Technology Co. |
Ma Y.-L.,East China Engineering Science and Technology Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2013
GSP has the advantages of wide flexibility of feedstock, unique and innovative design of gasifier and burner, advanced technical and economic indexes and good environmental performance etc. It is one of the most advanced coal syngas technologies. In this paper, the process and technical characteristics of GSP coal gasification technology for syngas are described and analyzed.
Zhuang Q.,CANMET Energy |
Clements B.,CANMET Energy |
Li Y.,East China Engineering Science and Technology Co.
International Journal of Greenhouse Gas Control | Year: 2012
Ammonia-based CO 2 capture technology has attracted wide research interest. Substantial work has been reported that includes theoretical evaluation, laboratory tests, pilot plant tests and economic analysis. Alstom and PowerSpan have conducted a few MW level demonstration tests. However, three inherent hurdles with this potential CO 2 capture technology have not been fully solved yet: ammonium bicarbonate solid formation in the absorption tower which may plug the tower packing, high ammonia vapor pressure that results in ammonia slip into the cleaned flue gas, and low CO 2 absorption rate resulting in large absorption equipment. Industrial ammonium bicarbonate fertilizer production processes are proven technology and have been optimized both technologically and economically for decades. This technology is also based on the chemistry and physics of the NH 3-CO 2-H 2O system. In the ammonia synthesis plant, CO 2 in shifted gas from the syngas obtained by gasification of coal is absorbed into partly carbonated aqueous ammonia in a liquid bubbling column to produce ammonium bicarbonate solid as fertilizer. Using this process, ammonium bicarbonate has been sustainably produced with low ammonia slip into the shifted gas after the CO 2 was captured. In this report, the ammonium bicarbonate fertilizer production process is described and analyzed. The advantageous aspects of the fertilizer production technology are compared with the current widely studied ammonia-based CO 2 capture technology for power plant applications. Insights into the modifications required for the flue gas CO 2 capture application are discussed. New designs of ammonia-based CO 2 capture processes are presented. © 2012.
Zhou W.,East China Engineering Science and Technology Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015
Coal gasification wastewater contains high concentration of acid gas and ammonia. In order to meet biochemical treatment requirements, deacidification and deamination are needed. Stripping process is widely used to remove acid gas and ammonia in coal gasification wastewater. But in the existing designs, the stripper pressure is high, which results in higher energy consumption. In view of this situation, modeling and optimization of the single stripper are carried out. The influence of stripper pressure on deacidification and deamination is analyzed. The results show that, if the other parameters that affect the separation of single stripper are not changed, such as hot feed location, tower top distillation, cold/hot feed ratio, cold feed temperature, side-draw location and side-draw production, adopting lower stripper pressure can not only meet the requirements of wastewater treatment but also reduce the energy consumption effectively. © 2015, China National Chemical Information Center. All right reserved.