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Study on the removal of NO_x from simulated flue gas using acidic NaClO_2 solution

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Journal of Environmental Sciences 2008年第1期20卷 33-38页

作者： Bal Rai Deshwal Si Hyun Lee Jong Hyeon Jung Byung Hyun Shon Hyung Keun Lee Department of Chemistry A.I.J.H.M College Rohtak 124001 (Haryana) India. Korea Institute of Energy Research Daejeon-305 343 Korea Department of Environmental Engineering Sorabol College Kyungbuk 780711 Korea Department of Environmental Engineering Hanseo University Chungnam 356820 Korea

The study on the removal of NOx from simulated flue gas has been carded out in a lab-scale bubbling reactor using acidic solutions of sodium chlorite. Experiments were performed at various pH values and inlet NO concentrations in the absence or presence of SO2 gas at 45℃. The effect of SO2 on NO oxidation and NO2 absorption was critically examined. The oxidative ability of sodium chlorite was investigated at different pH values and it was found to be a better oxidant at a pH less than 4. In acidic medium, sodium chlorite decomposed into C102 gas, which is believed to participate in NO oxidation as well as in NO2 absorption. A plausible NOx removal mechanism using acidic sodium chlorite solution has been postulated. A maximum NOx removal efficiency of about 81% has been achieved.

关键词： bubbling reactor acidic sodium chlorite flue gas NOx removal

Capture and separation of CO_(2) from flue gas by coupling free and immobilized amines

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Journal of Environmental Sciences 2002年第4期14卷 451-456页

作者： SHI Yao LI Wei Institute for Environmental Engineering Zhejiang UniversityHangzhou 310027China.

A novel system was proposed for the capture and separation of CO 2 from flue gas. In this method, a resin was employed to regenerate the amine capturing CO 2 from flue gas at room temperature. The feasibility for the resin to regenerate amines such as MEA, MAE, TEA, and ammonia was demonstrated. It was also discovered that the resin could be regenerated by hot water.

关键词： separation CO_(2) flue gas amine

Hg^0 removal from flue gas over different zeolites modified by Fe Cl_3

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Journal of Environmental Sciences 2015年第2期27卷 110-117页

作者： Hao Qi Wenqing Xu Jian Wang Li Tong Tingyu Zhu Beijing Engineering Research Center of Process Pollution Control Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

The elemental mercury removal abilities of three different zeolites（Na A, Na X, HZSM-5）impregnated with iron（Ⅲ） chloride were studied on a lab-scale fixed-bed reactor. X-ray diffraction, nitrogen adsorption porosimetry, Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy, and temperature programmed desorption（TPD） analyses were used to investigate the physicochemical properties. Results indicated that the pore structure and active chloride species on the surface of the samples are the key factors for physisorption and oxidation of Hg0, respectively. Relatively high surface area and micropore volume are beneficial to efficient mercury adsorption. The active Cl species generated on the surface of the samples were effective oxidants able to convert elemental mercury（Hg0）into oxidized mercury（Hg2＋）. The crystallization of Na Cl due to the ion exchange effect during the impregnation of Na A and Na X reduced the number of active Cl species on the surface, and restricted the physisorption of Hg0. Therefore, the Hg0 removal efficiencies of the samples were inhibited. The TPD analysis revealed that the species of mercury on the surface of Fe Cl3–HZSM-5 was mainly in the form of mercuric chloride（Hg Cl2）, while on Fe Cl3–Na X and Fe Cl3–Na A it was mainly mercuric oxide（HgO）.

关键词： Mercury Zeolite flue gas Adsorption Iron chloride HZSM-5

Desulfurizing absorbent for flue gas and its absorption mechanism

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Journal of Environmental Sciences 2003年第1期15卷 92-96页

作者： LIHua CHENWan－ren 等 ChemicalEngineeringCollege ZhengzhouUniversityZhengzhou450002China ShanghaiJiaotongUniversity Shanghai200240China

A new desulfurizing absorbent for flue gas, i.e., an organic physical solvent of DMSO(dimethyl sulfoxide) mixed with a relatively small amount of chemical solvent(Mn 2+ ) was studied. Compared with pure physical solvent of DMSO, the purification efficiency of the new absorbent was improved. And its absorption and reaction mechanism are discussed.

关键词： liquid absorption desulfurization flue gas

Displacement of shale gas confined in illite shale by flue gas: A molecular simulation study

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Chinese Journal of Chemical Engineering 2021年第1期34卷 295-303页

作者： Tong Tao Shitao Wang Yixin Qu Dapeng Cao State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The shale gas is an unconventional supplementary energy to traditional fossil energy,and is stored in layered rocks with low permeability and porosity,which leads to the difficulty for exploration of shale gas.Therefore,using CO_(2) gas to displace shale gas has become an important topic.In this work,we use molecular simulations to study the displacement of shale gas by flue gas rather than CO_(2),in which flue gas is modeled as a binary mixture of CO_(2) and N_(2) and the shale model is represented by inorganic Illite and organic methylnaphthalene.CH_(4) is used as a shale gas model.Compared to the pure CO_(2),flue gas is easily available and the cost of displacement by flue gas would become lower.Results indicate that the pore size of shale is an important factor in the process of displacing shale gas and simultaneously sequestrating flue gas,while the flue gas N_(2)-CO_(2) ratio shows a small effect on the process of CH_(4) displacement,because the high partial pressure of flue gas is the main driving force for displacement of shale gas.Moreover,the geological condition also has a significant effect on the process of CH_(4) displacement by flue gas.Therefore,we suggest that the burial depth of 1 km is suitable operation condition for shale gas displacement.It is expected that this work provides a useful guidance for exploitation of shale gas and sequestration of greenhouse gas.

关键词： Displacement of shale gas flue gas Illite shale Organic matter Molecular simulation

Hydrate capture CO_2 from shifted synthesis gas, flue gas and sour natural gas or biogas

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Journal of Energy Chemistry 2013年第1期22卷 39-47页

作者： Yanhong Wang Xuemei Lang Shuanshi Fan School of Chemistry and Chemical Engineering Key Lab of Enhanced Heat Transfer and Energy Conservation Ministry of Education South China University of Technology

CO2 capture by hydrate formation is a novel gas separation technology, by which CO2 is selectively engaged in the cages of hydrate and is separated with other gases, based on the differences of phase equilibrium for CO2 and other gases. However. rigorous temperature and pressure, high energy cost and industrialized hydration separator dragged the development of the hydrate based CO2 capture. In this paper, the key problems in CO2 capture from the different sources such as shifted synthesis gas, flue gas and sour natural gas or biogas were analyzed. For shifted synthesis gas and flue gas, its high energy consumption is the barrier, and for the sour natural gas or biogas （CO2/CH4 system）, the bottleneck is how to enhance the selectivity of CO2 hydration. For these gases, scale-up is the main difficulty. Also, this paper explored the possibility of separating different gases by selective hydrate formation and reviewed the progress of CO2 separation from shifted synthesis gas, flue gas and sour natural gas or biogas.

关键词： clathrate hydrate： C02 capture hydrogen shifted synthesis gas flue gas sour natural gas or biogas

Simultaneous desulfurization and denitrification of flue gas by pre-ozonation combined with ammonia absorption

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2457-2466页

作者： Baowei Wang Shumei Yao Yeping Peng Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

A process of simultaneous desulfurization and denitrification of flue gas was conducted in this study.The flue gas containing 200 mg·m^-3NO,1000-4000 mg·m^-3SO(2,)3%-9%O(2)and 10%-20%CO(2)was first oxidized b(y)O3 and then absorbed by ammonia in a bubbling reactor.Increasing the ammonia concentration or the SO2 content in flue gas can promote the absorption of NOx and extend the effective absorption time.On the contrary,both increasing the absorbent temperature or the O(2)content shorten the effective absorption time of NO((x.))The change of solution pH had substantial influence on NOx absorption.In the presence of CO(2)the NOx removal efficiency reached 89.2%when the absorbent temperature was raised to 60℃and the effective absorption time can be maintained for 8 h,which attribute to the buffering effect in the absorbent.Besides,both the addition of Na(2)S2 O3 and urea can promote the NOx removal efficiency when the absorbent temperature is 25℃and the addition of Na(2)S2 O3 had achieved better results.The advantage of adding Na(2)S2 O3 became less evident at higher absorbent temperature and coexistence of CO(2.)In all experiments,SO(2)removal efficiency was always above 99%,and it was basically not affected by the above factors.

关键词： flue gas Ammonia absorption Desulfurization Denitrification Pre-ozonation

New process development and process evaluation for capturing CO2 in flue gas from power plants using ionic liquid[emim][Tf2N]

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Chinese Journal of Chemical Engineering 2020年第3期28卷 721-732页

作者： Lan Li Xiaoting Huang Quanda Jiang Luyue Xia Jiawei Wang Ning Ai College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Province Key Laboratory of Biomass Fuel Hangzhou 310014China Biodiesel Laboratory of China Petroleum and Chemical Industry Federation Hangzhou 310014China Zhejiang Supcon Software Co. LtdHangzhou 310014China School of Engineering&Applied Science Aston UniversityBirmingham B47ETW MidlandsEnglandUK

Using the ionic liquid[emim][Tf2N]as a physical solvent,it was found by Aspen Plus simulation that it was possible to attempt to capture CO2 from the flue gas discharged from the coal-fired unit of the power plant.Using the combination of model calculation and experimental determination,the density,isostatic heat capacity,viscosity,vapor pressure,thermal conductivity,surface tension and solubility of[emim][Tf2N]were obtained.Based on the NRTL model,the Henry coefficient and NRTL binary interaction parameters of CO2 dissolved in[emim][Tf2N]were obtained by correlating[emim][Tf2N]with the gas–liquid equilibrium data of CO2.Firstly,the calculated relevant data is imported into Aspen Plus,and the whole process model of the ionic liquid absorption process is established.Then the absorption process is optimized according to the temperature distribution in the absorption tower to obtain a new absorption process.Finally,the density,constant pressure heat capacity,surface tension,thermal conductivity,and viscosity of[emim][Tf2N]were changed to investigate the effect of ionic liquid properties on process energy consumption,solvent circulation and heat exchanger design.The results showed that based on the composition of the inlet gas stream to the absorbers,CO2 with a capture rate of 90%and a mass purity higher than 99.5%was captured.These results indicate that the[emim][Tf2N]could be used as a physical solvent for CO2 capture from coal-fired units.In addition,the results will provide a theoretical basis for the design of new ionic liquids for CO2 capture.

关键词： Ionic liquids CO2 capture Aspen Plus process simulation New green physical solvents flue gas

Comparison and Optimization of Mid-low Temperature Cogeneration Systems for flue gas in Iron and Steel Plants

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Journal of Iron and Steel Research(International) 2013年第11期20卷 33-40页

作者： ZHANG Li-hua WU Li-jun ZHANG Xiao-hong JU Gui-dong Thermal and Environmental Engineering Institute Tongji University Resources and Environment Department Shandong Water Polytechnic

Three generation systems, namely, steam Rankine cycle （SRC）, organic Rankine cycle （ORC）, and steam-organic combined Rankine cycle （S-ORC）, were simulated using the Engineering Equation Solver fEES） to efficiently utilize flue gas emissions from 200 to 450 ℃ in iron and steel plants. Based on the simulation results for thermal efficiency, exergy efficiency, and power generation, the performances of the three power generation systems were compared and analyzed. To further utilize waste heat from the turbine exhaust steam of the ORC system, cas- cade （）RC （CORC） was designed for heat sources above 300 ℃. Based on a comprehensive performance comparison, the application of the ORC using R141b is preferable for 200 to 300 ℃ flue gas. For 300 to 450 ℃ flue gas, CORC is an alternative technology to improve the efficiency and quality of waste heat utilization. For flue gas above 450 ℃, S-ORC can achieve higher efficiency and power generation than conventional SRC, with a relatively small negative pressure and high dryness of the turbine outlet steam. Hence, S-ORC can be considered as a substitute for SRC.

关键词： mid-low temperature flue gas Rankine cycle thermal energy recovery generation system