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Yan T.,Shanghai JiaoTong University | Li T.X.,Shanghai JiaoTong University | Li H.,China Shipbuilding Industry Corporation CSIC | Wang R.Z.,Shanghai JiaoTong University
International Journal of Refrigeration | Year: 2014

A new composite sorbent made of CaCl2 and multi-walled carbon nanotube (MWCNT) was prepared for solid-gas ammonia adsorption refrigeration systems in the paper. The composite sorbent was fabricated by impregnating MWCNTs matrix with CaCl2 to improve the adsorption performance of the chemical sorbent. The ammonia adsorption capacity of the composite sorbent and the MWCNTs matrix were measured using a Rubotherm magnetic suspension balance. Experimental results showed that the maximum adsorption amount of ammonia by the MWCNTs matrix and the composite sorbent are 90.05 mg gCNT-1 and 859.85 mg gsorbent-1 under the experimental conditions. Moreover, the chemical reaction plateaus and steps of the reaction between CaCl2 and NH3 were analyzed and the adsorption capacities of the composite sorbent at different working conditions were evaluated. The results indicated that although the adsorption capacity of ammonia on the pure MWCNTs is relatively low, the addition of MWCNTs into the chemical sorbent can avoid the agglomeration and prevent the adsorption performance attenuation of reactive salt. ©2014 Elsevier Ltd. All rights reserved. Source


Chen J.,Xian Jiaotong University | Wang Y.,Xian Jiaotong University | Li X.,Xian Jiaotong University | Li X.,China Special Equipment Inspection And Research Institute | And 4 more authors.
Powder Technology | Year: 2015

A CFD-DEM-based liquid-particle two-phase flow erosion prediction model occurring over such pipeline connection as elbows, which takes the interaction of liquid-particle, particle-particle and particle-wall into account, is proposed in this study. The standard k - ε model is adopted for fluid turbulent flow, the standard wall functions for near-wall zone treatment, and the Hertz-Mindlin (no slip) model for particle-particle and particle-wall contact. Numerical simulations have been performed by combining CFD code ANSYS FLUENT with DEM code EDEM to predict the maximum erosion rate and location in 90°, 60° and 45° elbows with diameter 40mm. The fluid is water with inlet velocity 3m/s, and the particles are 150μm in diameter and 2650kg/m3 in density. While the maximum erosion rates of the three are found to be quite different, the maximum erosive locations have been indicated to be at or near the exit of the elbows. In addition, the effect of bend-angle on erosion, particle motion and flow field has been discussed. © 2015 Elsevier B.V. Source


Luo A.,Hunan University | Ma F.,Hunan University | Xiong Q.,China Shipbuilding Industry Corporation CSIC | He Z.,Hunan University
Journal of Power Electronics | Year: 2015

A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method. © 2015 KIPE. Source


Yan T.,Shanghai JiaoTong University | Wang R.-Z.,Shanghai JiaoTong University | Li H.,China Shipbuilding Industry Corporation CSIC | Ma L.,Shanghai JiaoTong University | Li T.-X.,Shanghai JiaoTong University
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

A novel sorption heat transformer is introduced for the integrated energy storage and energy upgrade of low-grade thermal energy on the basis of the pressure-reducing desorption technique and temperature-lift adsorption technology. The experimental research was carried out by employing the MnCl2-NaBr-NH3 as the working pair. When the temperature of driving heat source is 121℃ and heated end user simulated is 150℃, the corresponding energy storage efficiency is 0.302 with the ambient temperature of 15℃ and the evaporating temperature of 55℃. The research results showed that the thermochemical composite sorption energy storage technology can effectively achieve the thermal energy upgrade and provide the required heat for the heat consumer. It can be used to store the thermal energy and lift the energy quality of low-grade thermal energy. It is feasible and provides a new idea for the comprehensive utilization of low-grade thermal energy. Source


Wang R.,Ningbo University | Wang R.,Third Institute of Oceanography | Ren C.,China Shipbuilding Industry Corporation CSIC | Huang N.,China Shipbuilding Industry Corporation CSIC | And 2 more authors.
Marine Genomics | Year: 2015

Pseudomonas oleovorans MGY01 isolated from the deep-sea water of the South China Sea could effectively degrade malachite green. The draft genome of P. oleovorans MGY01 was sequenced and analyzed to gain insights into its efficient metabolic pathway for degrading malachite green. The data obtained revealed 109 Contigs (N50; 128,269bp) with whole genome size of 5,201,892bp. The draft genome sequence of strain MGY01 will be helpful in studying the genetic pathways involved in the degradation of malachite green. © 2014 Elsevier B.V. Source

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