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The Advances of Post-combustion CO 2 Capture with Chemical Solvents: Review and Guidelines

Energy Procedia 2014年 63卷 1339-1346页

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

Carbon dioxide is the major greenhouse gas that contributes to the global warming more than 60%. Carbon dioxide from power plants is one of the main sources. Therefore it is essential to reduce the CO 2 emission from power plant flue gas. Post- combustion carbon capture is the optimal choice in near-to meddle-term, since it does not need to change the configuration of the power plants essentially. Chemical absorption with amine-based solvents is currently the state-of-the-art technology for post- combustion carbon capture. This paper introduces the typical CO 2 amine absorption process and analyses the main problems during the absorption process. To make the process more efficient, several improvements were investigated: increasing gas-liquid contacting area, searching for new type of reactant, and dilution of the aqueous fraction with organic liquids. The present study aims to summarize the improvements in amine scrubbing process for CO 2 capture and forecast the promising research directions in the future.

关键词： CO 2 emission post-combustion capture chemical absorption absorbents

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

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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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Single-jet Spray Mixing with a Confined Crossflow

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Chinese Journal of Chemical engineering 2013年第1期21卷 14-24页

作者：孙慧娟白博峰严俊杰张海滨 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

In order to achieve uniform mixing between spray droplets and crossflow, cold-model experiment of a hollow-cone water spray in an air crossflow is investigated via a numerical simulation. The simulation cases are designed by using the orthogonal design method. The Eulerian-Lagrangian formulation is employed for modeling the droplets-crossflow two-phase flow while the realizable k-ε turbulence model is used to describe the turbulence. A new index, mixedness quality, is proposed to assess the overall mixing of the droplets in the crossflow. The simulation results demonstrate that the counter-rotating vortex pair (CVP) imposes a more significant impact on the spatial distribution than on the size distribution of the droplets. Pairs of CVP with smaller scales are preferable for achieving a better mixing. The influencing factors are listed in the following order in terms of the degree of their impact from the greatest to the least: the Sauter diameter of the initial droplets, the mixing tube diameter, the spray angle, the velocity of the inlet crossflow, and the vertical velocity of the initial droplets. A moderate droplet diameter, a smaller tube diameter, a moderate spray angle, a greater crossflow velocity and a moderate vertical velocity of the droplet are favorable for achieving a higher mixedness quality of the jet spray in a confined crossflow.

关键词： mixing jet spray droplets crossflow numerical simulation

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Correction: An ionic liquid extraction process for the separation of indole from wash oil

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Green Chemistry 2015年第10期17卷 4846-4846页

作者： Tiantian Jiao Xulei Zhuang Hongyan He Lihong Zhao Chunshan Li Hongnan Chen Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P.R. China Henan Energy Chemical Industry Group Co. Ltd Zhengzhou 450000 P.R. China

Correction for ‘An ionic liquid extraction process for the separation of indole from wash oil’ by Tiantian Jiao, et al., Green Chem., 2015, 17, 3783–3790.

Correction for ‘An ionic liquid extraction process for the separation of indole from wash oil’ by Tiantian Jiao, et al., Green Chem., 2015, 17, 3783–3790.

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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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A facile two-step pretreatment method for delignification of cornstalk by combining choline hydroxide and 1-ethyl-3-methylimidazolium dimethylphosphate

A facile two-step pretreatment method for delignification of...

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第十七届全国化学热力学和热分析学术会议

作者： Junli Xu Xingmei Lu Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences College of Chemistry and Chemical Engineering Graduate University of Chinese Academy of Sciences

Ionic liquids are recognized as solvents with great potential for cellulose dissolution and biomass pretreatment.1, 2 The aim of this work was to develop efficient cornstalk pretreatment methods with low energy cost. An effectively two-step method combining choline hydroxide(ChOH) and 1-ethyl-3-methylimidazolium dimethyl phosphate([Emim][DMP]) was developed for delignification of cornstalk under mild conditions. In this two-step method, cornstalk sample was first soaked in ChOH aqueous solution for 3 hours, and then the residue was dissolved completely by [Emim][DMP] in 10 minutes. As compared to cornstalk sample, most lignin was removed and cellulose content was greatly increased in the regenerated cellulose rich material(CRM), which was obtained from [Emim][DMP] solution by adding anti-solvent. Meanwhile, the CRM was converted into HMF with a high yield of 87.21 %. This two-step method enhanced the cornstalk pretreatment by increasing the dissolution of cornstalk and shortening the dissolving time at high pretreated temperature, which indicated that the two-step method for cornstalk was effective and eco-friendly.

关键词： Cornstalk Two-step method Pretreatment Ionic liquids

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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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