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Leakage source parameters identification for CO 2 sequestration based on Occam method

Energy Procedia 2014年 63卷 3815-3820页

作者： Denglong Ma Zaoxiao Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 P.R. China School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 P.R. China

CO 2 gases stored underground may escape from the reservoir site to other places and even through the soil layer into atmosphere, thus identify the leakage source is therefore a crucial problem after leakage occurring. The paper introduced a direct method to solve the inverse problem combined with the optimization method, which is Occam regularization method. This method was applied to estimate the source parameters. Firstly, the calculation process of Occam regularization method was introduced and then the feasibility of its application for source parameters identification was proved by simulation and experiment data. The results showed that, Occam regularization method is able to estimate source parameters successfully.

关键词： Gas emission Parameters regularization Optimization Nonlinear inverse problem

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Computational Study of CO 2 Absorption in Aqueous and Non-aqueous Solutions Using MEA

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Energy Procedia 2014年 63卷 1347-1353页

作者： Tingting Zhang Zaoxiao Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 P.R. China School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 P.R. China

Chemical absorption using Ethanolamine to capture CO 2 is considered to be an effective way to cover the large reduction of the greenhouse gas emissions. As the absorption capacity is different between aqueous and non- aqueous solutions, in this work, the reaction processes about monoethanolamine (MEA) absorbing CO 2 in aqueous and non-aqueous (take methanol as the medium) solvation effect without solvent molecular are studied using density functional theory (DFT), respectively. The result shows that the reaction mechanism is same both in aqueous and non-aqueous solutions and a two-step reaction process can demonstrate it well. The main effect of the different solvent on the reaction is the relative energy of the optimized configurations. The energy shows that stable configurations have lower relative energy in methanol than in water, which demonstrates that the configurations are more stable in non-aqueous solutions than those in aqueous solutions.

关键词： CO 2 absorption DFT MEA water methanol solvation effect

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Optimization of the concentration field in a suspended photocatalytic reactor with the periodically changing solar irradiation

Optimization of the concentration field in a suspended photo...

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26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013

作者： Cao, Fei Zhao, Liang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Feasibility of the solar photocatalysis has been validated theoretically and experimentally. Main concerns on the solar photocatalysis in the solutions are: the mass transfer limitation between the photocatalyst and the solution, and the concentration or radiation distribution in the photoreactors. Most researches concentrated their research on one aspect. There is limited research considering variable catalysis concentrations together with the changing solar radiation. However, outdoor solar photocatalysis devices, i.e. for hydrogen production or waste water degradation, would practically face this phenomenon. In the present study, the photon absorption in a suspended photocatalytic reactor was simulated by adopting Monte Carlo method and the six-flux radiation absorption-scattering model. Different photocatalyst concentrations were taken into account. Simulation results indicated that the photon absorption had a close relationship with the concentration distribution of the photocatalysts, and that there is an optimal concentration gradient in the photoreactor leading to the maximum photon absorption. Accordingly, the concentration field is optimized according to the changing solar irradiation. The present work is expected to be of effective value for obtaining the optimal operating parameters for industrial solar photocatalytic applications.

关键词： Solar radiation

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Study on factors of combustion characteristics of coals with thermo-balance

Study on factors of combustion characteristics of coals with...

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International Conference on power engineering 2013, ICOPE 2013

作者： Fu, Jiapeng Luo, Qinlan Chang, Yan Li, Na Zhou, Qulan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 710049 China

With the experimental system of thermo-balance, the combustion characteristics of powders of different kinds of coals under various experimental conditions are studied by using the method of thermo-gravimetric analysis and differential scanning calorimetry. Different factors such as heating rate, particle size and additives on the combustion characteristics are investigated. The results show that, with the raise of heating rate , coal combustion TG and DTG curves of different kinds of coal move to higher temperature zone and the combustion rate increases while the characteristics of ignition and burnout is strengthened. With the sample weight increasing, the ignition temperature and coal combustion rate decreases and the burnout temperature increases. With the decrease of particle size of coal powder, combustion characteristics are commonly enhanced firstly and wakened later. Additives such as K2CO3, Ca(OH)2, Fe(NO3)3·9H2O, FeSO4 can promote coal combustion in the low temperature zone(573∼723K).

关键词： Heating rate

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Design and simulation of a novel geothermalsolar combined chimney power plant

Design and simulation of a novel geothermalsolar combined ch...

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26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013

作者： Cao, Fei Ma, Qiuming Zhao, Liang Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

The solar chimney power plant (SCPP) is dominated by the solar radiation, and therefore its discontinuous operation is an unavoidable problem. In this paper, low temperature geothermal energy is introduced into the SCPP for overcoming this problem. Based on a developed mathematical model, theoretical analyses are carried out to investigate the performance of the geothermal-solar chimney power plant (GSCPP) with main dimensions the same as the Manzanares prototype in Spain. It is found that the GSCPP can attractively run in the full geothermal mode to deliver power continuously, which could solve the problem of the SCPP's running without sunlight in a long time, including at night. In addition, the introducing of geothermal energy into the SCPP can highly improve its power capacity.

关键词： Geothermal energy

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Experimental study on a linear concentrating solar photovoltaic/thermal system

Experimental study on a linear concentrating solar photovolt...

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26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013

作者： Ma, Qiuming Cao, Fei Zhao, Liang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

A set of solar photovoltaic and thermal combined (PV/T) system is installed and tested in the present study. The PV/T system is designed and constructed by integrating coiled-channel flat-plate collectors with polycrystalline silicon PV modules. The linear Fresnel lens acts as the concentrator. Three systems, i.e. the non-cooling PV system, the non-concentrating PV/T system and the concentrating PV/T system, are tested and analyzed. Experimental results show that a high thermal and electrical combined efficiency, over 65%, is achieved by the PV/T system. Water in the flat plate can significantly decrease the PV module temperature and improve the electricity-conversion efficiency. Comparing with the non-concentrating PV/T system, the concentrating PV/T system can increase the total utilization of solar energy.

关键词： Solar energy

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Hydrogen production by non-catalytic partial oxidation of coal in supercritical water: Explore the way to complete gasification of lignite and bituminous coal

Hydrogen production by non-catalytic partial oxidation of co...

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作者： Ge, Zhiwei Guo, Simao Guo, Liejin Cao, Changqing Su, Xiaohui Jin, Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China

Supercritical water gasification (SCWG) of coal is a promising technology for clean coal utilization. In this paper, hydrogen production by non-catalytic partial oxidation of coal was systematically investigated in supercritical water (SCW) with quartz batch reactors for the first time. The influences of the main operating parameters including residence time, temperature, oxidant equivalent ratio (ER) and feed concentration on the gasification characteristics of coal were investigated. The experimental results showed that H2 yield and carbon gasification efficiency (CE) increased with increasing temperature and decreasing feed concentration. CE increased with increasing ER, and H 2 yield peaked when ER equaled 0.1. CE increased quickly within 1 min and then tended to be stable between 2 and 3 min. In particular, complete gasification of lignite was obtained at 950 C when ER equaled 0.1, as for bituminous coal, at a higher temperature of 980 C when ER equaled 0.2. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Hydrogen production

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

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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...

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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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