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检索条件"机构=Key State Laboratory of Multiphase Flow and Power engineering"

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Experimental investigation on flow patterns and frictional pressure drop of downward air-water two-phase flow in vertical pipes

引用

ASME 2013 Heat Transfer Summer Conference, HT 2013 Collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, engineering and Technology

作者： Xue, Yuqing Li, Huixiong Tianyou, Sheng Liao, Changjiang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Xi'an China

ISBN: (纸本)9780791855485

A large amount of air need be transported into the reservoir in the deep stratum to supply oxygen to some microbes in Microbial Enhanced Oil Recovery (MEOR). Air-water twophase flows downward along vertical pipeline during the air transportation. Base on the experiment data described in this paper, the characteristics of air-water two phase flow patterns were investigated. The flow pattern map of air-water two phase flows in the pipe with inner diameter of 65 mm was drawn, criterions of flow pattern transition were discussed, and the dynamic signals of the pressure and the differential pressure of the two phase flow were recorded to characterize the three basic flow regimes indirectly. The frictional pressure drop of downward flow in vertical pipe must not be disregarded contrast with upward two phase flow in the vertical pipe because the buoyancy must be overcame when the gas flows downward along pipe, and there would be a maximum value of frictional when the flow pattern translated from slug flow to churn flow. Copyright © 2013 by ASME.

关键词： Two phase flow

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Disruption of multidrug resistance protein gene of Rhodobacter capsulatus results in improved photoheterotrophic hydrogen production

Disruption of multidrug resistance protein gene of Rhodobact...

引用

作者： Ma, Chao Yang, Honghui Zhang, Yang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

Rhodobacter capsulatus (R. capsulatus), which is a typical purple nonsulfur photosynthetic bacterium, is able to produce hydrogen under photosynthetic condition. A mutant of R. capsulatus named MC122 was obtained by Tn5 transposon mutagenesis. The transposon mutant had improved photoheterotrophic hydrogen production performance using acetic acid as substrate and its mutation site was located by sequencing the rescued plasmid containing the transposon insertion from the genome of the mutant. It was found for the first time that disruption of the multidrug resistance protein (mdtB) gene resulted in improved hydrogen production. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Proteins

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Boiling coal in water: Hydrogen production and power generation system with zero net CO2 emission based on coal and supercritical water gasification

Boiling coal in water: Hydrogen production and power generat...

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作者： Guo, Liejin Jin, Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

Coal is the single most important fuel for power generation today. Nowadays, most coal is consumed by means of "burning coal in air" and pollutants such as NOx, SOx, CO2, PM2.5 etc. are inevitably formed and mixed with excessive amount of inner gases, so the pollutant emission reduction system is complicated and the cost is high. IGCC is promising because coal is gasified before utilization. However, the coal gasifier mostly operates in gas environments, so special equipments are needed for the purification of the raw gas and CO2 emission reduction. Coal and supercritical water gasification process is another promising way to convert coal efficiently and cleanly to H2 and pure CO2. The gasification process is referred to as "boiling coal in water" and pollutants containing S and N deposit as solid residual and can be discharged from the gasifier. A novel thermodynamics cycle power generation system was proposed by us in state key laboratory of multiphase flow in power engineering (SKLMFPE) of Xi'an jiaotong University (XJTU), which is based on coal and supercritical water gasification and multi-staged steam turbine reheated by hydrogen combustion. It is characterized by its high coal-electricity efficiency, zero net CO2 emission and no pollutants. A series of experimental devices from quartz tube system to a pilot scale have been established to realize the complete gasification of coal in SKLMFPE. It proved the prospects of coal and supercritical water gasification process and the novel thermodynamics cycle power generation system. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Coal

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Laminar flame speeds and flame structure of syngas using OH-PLIF

Laminar flame speeds and flame structure of syngas using OH-...

引用

9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Fu, Jin Jing, Wu Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

The effects of flame stretch and hydrogen dynamic stretch on laminar Bunsen flames, especially for the mixture with high H2 fraction, were studied in this paper. OH-PLIF was used to examine the flame reaction zone by visualizing the OH radical concentrated zone. Experiments were conducted at equivalence ratios ranging from 0.5 to 1.6 in the laminar flow range with Reynold's number from 800-2200. H2 fractions in the H2/CO mixture vary from 0.25 to 4.0. Results show that with the increase of H 2 fraction in fuel mixture, the effects of both hydrodynamic stretch and flame stretch are increased. Interpretation on the effect of stretch on flame is provided.

关键词： Mixtures

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Investigation on catalyzed reactivities of synthetic model coal under oxy-fuel conditions by thermal analysis

Investigation on catalyzed reactivities of synthetic model c...

引用

9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Wang, Chang'an Du, Yongbo Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Oxy-fuel combustion is one of the near-zero emission clean coal technologies, which can realize large-scale CO2 capture. In this paper, catalyzed reactivities of synthetic model coal incorporating Fe 2O3, TiO2, and MnO2 under oxy-fuel conditions have been investigated using thermal analysis method. Experimental results show that all three catalysts present a certain extent catalytic action on the combustion behaviors of synthetic model coal under oxy-fuel conditions. The catalytic activity in main combustion process of model coal could be described as follows: Fe2O3 > TiO2 > MnO2. The increase of catalyst content causes the model coal combustion process to slightly shift to lower-temperature zone. The ignition temperature Ti shows almost no variation as Fe2O 3 or TiO2 is added into the samples. The catalysts present a not very obvious catalytic activity on the pyrolysis behaviors of synthetic model coal. In addition, TiO2 shows the greatest catalytic activity on the model coal gasification performance, while MnO2 plays an unfavorable role. The catalytic activity in gasification process of model coal could be described as follows: TiO2 > Fe2O3 > MnO2.

关键词： Coal

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Laminar flame speeds of iso-octane/n-butanol blends-air mixtures at elevated temperatures

Laminar flame speeds of iso-octane/n-butanol blends-air mixt...

引用

9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Zhang, Xinyi Yu, Huibin Tang, Chenglong Gong, Jing Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

In this work, laminar flame speed of iso-octane/n-butanol-air mixtures was studied using the outwardly expanding spherical flame method and high-speed schlieren photography technique over a wide range of equivalence ratios and blending ratios at elevated initial temperatures. To interpret the dependence of the laminar flame speed on volume fraction of n-butanol in fuel blends (f vb), mechanistic interpretation was attempted through examining thermodynamic property, diffusive property and oxidation kinetics of the mixtures. Furthermore, the measured laminar flame speeds were fitted as a function of equivalence ratio, initial temperature and n-butanol fraction so as to provide some engineering merits.

关键词： Speed

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Comparative study on PM emission of gasoline/propanol isomers

Comparative study on PM emission of gasoline/propanol isomer...

引用

9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Gong, Jing Huang, Bin Gu, Xiaolei Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

Propanol isomers are oxygenated fuels that have the potential to reduce the emission of engines. Particulate matter (PM) emissions of gasoline/propanol isomers blends have been comparatively investigated at different blending ratios of propanol isomers (0%, 10%, 20%, 40% and 100%) and EGR (Exhaust Gas Recirculation) rates (0% and 10%). Pure propanol isomers show significantly different emission characteristics compared to the other blends. PM number concentration decreases when EGR is introduced while little variation of PM mass concentration is observed. N-propanol mixtures produce higher PM number concentration than those of iso-propanol mixtures at the same blending ratio caused by their distinctively molecular structures and properties. The present study shows iso-propanol gives better performance as a gasoline additive compared to n-propanol.

关键词： Mixtures

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Photocatalytic degradation of waste liquid from biomass gasification in supercritical water with simultaneous hydrogen production over CdS sensitized Na2Ti2O4(OH)2

引用

Nanostructured Materials and Nanotechnology V - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012

作者： Tang, Wendong Jing, Dengwei Guo, Simao Yin, Jiarong Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an ShaanXi 710049 China

ISBN: (纸本)9781118205976

Photocatalytic water splitting by solar light and biomass gasification in supercritical water both are considered as the most promising routes for renewable hydrogen production. The waste liquid from biomass gasification in supercritical water contains various organic compounds which can act as electron donors in photocatalytic system. In the present work, we report the hydrogen production by the anaerobic photocatalytic reforming of waste liquid from biomass gasification in supercritical water over CdS sensitized Na 2Ti2O4 (OH)2 nanotubes, Various reaction parameters were investigated, such as different gasification temperature and the pH value of the reaction solution. It was demonstrated that gasification in supercritical water and photocatalytic water splitting can be coupled together.

关键词： Cadmium sulfide

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Experimental and kinetic study of auto-ignition in diluted methane-hydrogen fuel blends at elevated pressures

Experimental and kinetic study of auto-ignition in diluted m...

引用

9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Zhang, Yingjia Jiang, Xue Zhang, Jiaxiang Wei, Liangjie Man, Xingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xianning West Road Xi'an Shaanxi 710049 China

Ignition delay times were obtained behind the reflected shock waves for the diluted stoichiometric methane/hydrogen blends with hydrogen fractions of 20%, 60%, and 80%. Test temperatures from 980 K to 1820 K and pressures from 0.5 to 2.0 MPa. Results show that increase in hydrogen fraction significantly promotes the ignition of fuel blends due to high activity of hydrogen. Pressure-dependence of auto-ignition for methane/hydrogen was observed in three ignition regimes (methane chemistry dominating ignition, combined chemistry of methane and hydrogen dominating ignition and hydrogen chemistry dominating ignition). An explanation of the interaction between chemistries of methane and hydrogen were given by fuel flux analysis using NUIG Mech C5-49.

关键词： Hydrogen

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Simulation study on boiler thermal system of a 600MW supercritical lignite-fired power plant based on GSE

Simulation study on boiler thermal system of a 600MW supercr...

引用

International Conference on power engineering 2013, ICOPE 2013

作者： Han, Xiaoqu Ma, Huajie Xue, Zhaonan Yan, Junjie Chong, Daotong Wang, Jinshi State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jia Otong University Xi'an710049 China

In this paper, the boiler thermal system of a 600MW supercritical lignite-fired power plant was modeled and simulated with the application of GSE simulation software. The model was developed in Jtopmeret according to the structural features and divided into steam-water system, flue gas -air system, and direct-fired pulverizing system. Model simulations were implemented in SimExec. The outlet temperature of different devices and sections under BMCR and 75% THA conditions were compared with the reference data. The results show that the simulation model developed had high accuracy and reliability. Further simulations were carried out on the varied load. The boiler efficiency and flue gas extraction amount changed with the load.

关键词： Flue gases

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