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Feng L.,China University of Petroleum - Beijing | Feng L.,China National Institute of Clean and Low Carbon Energy | Nie Y.,China University of Petroleum - Beijing | Nie Y.,Xinao Science and Technology Development Co. | And 3 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2016

To simulate the boiling process, the wall heat flux was divided based on Lavievile's thermal non-equilibrium heat flux partition algorithm. The mixture k-ε turbulent model was improved by combination of Sato model and a modifier function, by which a new drag model was presented to simulate the full boiling flow in tube. The simulated result of boiling flow in vertical circular tube agreed with experiment data well, indicating that the model was valid in simulation of boiling flow in whole tube. It is found from the simulation that the wall heat transfer coefficient was evidently enhanced in boiling, however, heat transfer deterioration appeared when the volume fraction of vapor near the wall reached about 0.6. © 2016, Science Press. All right reserved. Source

Li J.,Tianjin University | Li J.,Xinao Science and Technology Development Co. | Li W.,Xinao Science and Technology Development Co. | Wan X.,Xinao Science and Technology Development Co. | And 2 more authors.
Huagong Xuebao/CIESC Journal | Year: 2010

The feasibility of using Sn-doped Al-Ni alloy powder as low-cost cathode catalyst for H2 production in microbial electrolysis cells (MEC) was studied. The synergism of Ni, Al and Sn could improve the hydrogen selectivity of catalyst. SEM photographs showed that Ni-Al-Sn alloy powders had a single morphology when the content of Sn was 0, 5%, 10%, while two different appearances could be found when the content of Sn was 15%. XRD patterns indicated that only Ni-Al-Sn alloy phase could be detected in 0, 5%, 10% Sn-doped Ni-Al alloy powders, while Sn could be detected besides the alloy phase for 15% Sn-doped Ni-Al alloy powders. Compared with platinum catalyst, although the alloy catalyst produced more slowly hydrogen gas, it had higher selectivity of hydrogen. The catalyst containing 50% Ni, 45% Al, 5% Sn was the better catalyst for H2 production from MEC. MEC could replace the anaerobic system and produce hydrogen in the process of wastewater treatment. © All Rights Reserved. Source

Li J.-L.,Tianjin University | Li J.-L.,Xinao Science and Technology Development Co. | Li W.,Xinao Science and Technology Development Co. | Wang L.-M.,Xinao Science and Technology Development Co. | And 3 more authors.
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2011

Hydrogen production performance of a membrane-less bio-electrochemically assisted microbial reactor was studied in this paper. Membrane-less microbial reactor consisted of carbon felt as anode, carbon plate supported by self-made Ni-Al-Sn alloy powders(Ni-50%, Al-45%, Sn-5%) as cathode and acetate as electrolyte for generating hydrogen. Its principle was that the organic was degraded by microbe to produce electron and protons in the anode chamber, and then protons arriving at cathode got electron and generated hydrogen through an applied voltage between two electrodes of membrane-less microbial reactor. The influences of carbon felt amount used for the anode, environment temperature, and applied voltage, etc. on hydrogen production rate and hydrogen selectivity were studied. And the optimal results demonstrated that the rate of hydrogen production reached at 4.21 m3/(d·m3) and the highest hydrogen selectivity was 70.4% when the anode surface area was 900 cm2, the environment temperature was 30°C and the applied voltage was 0.9 V. Source

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