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NO reduction by carbon-based gases based on coal gasification fractions:NO reduction intermediate identification and kinetic analysis

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Frontiers of Environmental Science & engineering 2025年第3期19卷 175-189页

作者： Xiang Zhang Jian Tian Tanghui Hu Guangyong Yue Xianlong Liu Wen Zhou Xiaohong Liu Xinye Wang Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Engineering Research Center for Green Industrialization Technology of Industrial WasteSchool of Materials Science and EngineeringHubei UniversityWuhan 430062China Hubei Huda Tianshu New Energy Materials Industrial Research and Design Institute Co. Ltd.Wuhan 430062China Wuhan Tianshu Dust Removal Equipment Co. Ltd.Wuhan 430062China Engineering Laboratory for Energy System Process Conversion&Emission Control Technology of Jiangsu Province School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210042China

Combining pulverized coal gasifiers with cement kiln production is promising for application in low-cost and efficient NO *** paper presents a pulverized coal gasifier catalytic denitration technique and investigates the homogeneous reduction(by CO and CH_(4))and heterogeneous catalytic reduction(by coke,CaO,MgO,and Fe_(2)O_(3))of NO.A combination of Chemkin simulations and fixed-bed experiments is used to elucidate the reaction pathways and key intermediates of NO reduction by carbon-based *** addition,the activation energies for different catalyst combinations were analyzed via reaction *** results demonstrate that the presence of small amounts of O_(2) inhibits NO reduction by CO but promotes NO reduction by CH_(4).The NCO·radical is essential for the NO reduction process,and the generation of this radical depends on the CH_(4) cleavage intermediate and O·*** and Fe_(2)O_(3) exhibit more significant catalytic effects on NO reduction by carbon-based gases than the other catalysts *** presence of a small amount of O_(2) in the reacting gas mixtures facilitates the NO reduction *** activation energy is reduced to 1.02 kJ/mol,and the NO conversion reaches 99.80%when the catalyst is C+CaO+MgO+Fe_(2)O_(3) and the gas composition is CO+CH_(4)+O_(2).This work provides theoretical support and data recommendations for the use of pulverized coal gasifiers for the denitrification of cement kilns.

关键词： Carbon-based gas Catalytic denitration Coke Kinetic analysis Reaction mechanism

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Release characteristics of mercury in chemical looping combustion of bituminous coal

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Journal of Environmental Sciences 2020年第8期32卷 197-203页

作者： Ling Ji Qianwen Wang Zhiyue Zhang Hao Wu Changsong Zhou Hongmin Yang Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing 210042PR China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityNanjing210096China

This study evaluated the release characteristics of mercury from bituminous coal in chemical looping combustion(CLC)using Australian iron ore as the oxygen carrier in a fixed bed *** effects of several parameters,such as temperature in the fuel reactor(FR)and air reactor(AR),gasification medium in the FR,and reaction atmosphere in the AR,on mercury release characteristics,were *** mercury speciation and release amount in the FR and AR under different conditions were further *** results indicate that most of the mercury in coal was released in the FR,while the rest of it was released in the ***0 was found to be the major species in the released *** results also indicate that a higher temperature in the FR led to an increase in the total mercury release amount and a decrease in Hg0 ***,a higher temperature in the AR resulted in a decrease in the total mercury release amount and Hg 0 *** increase in the H2O/CO2 ratio of gasification mediums in the FR was beneficial for the increase in the total mercury release amount and Hg 0 proportion.A higher O2 concentration in reaction atmosphere in AR had a negligible effect on the total mercury release amount,but a positive effect on Hg0 oxidization.

关键词： Chemical looping combustion Mercury Release amount Distribution

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Numerical Simulation of Co-Combustion of Pulverized Coal and Biomass in Ttf Precalciner

SSRN

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SSRN 2022年

作者： Gao, Ruidan Yin, Shangyi Song, Tao Lu, Ping Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210042 China

A 3D Eulerian-Lagrangian model using MP-PIC method is developed to study the co-combustion of pulverized coal and biomass in a TTF precalciner. The results show that there are three spraying effects and five recirculation zones formed near the raw meal inlet in the precalciner. The highest temperature can reach up to 1600 K in the main combustion zone and the decomposition rate of raw meal can reach 93.9% with no biomass input. In addition, with the increase of biomass blending ratio, the average temperature, the decomposition rate of raw meal and NO x emissions in the precalciner show a downward trend. When the biomass input is 40%, the concentration of NO at the outlet decreased to 302 ppm. However, on the premise of ensuring that the decomposition rate of cement raw meal is not less than 85%, the biomass blending ratio of 30% may be the best choice. © 2022, The Authors. All rights reserved.

关键词： Biomass

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Experimental study on adsorption of PbCl2 and CdCl2 on kaolin modified by leachates from municipal solid waste incineration power plant

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Chemosphere 2023年第1期340卷

作者： Liu, Changqi Huang, Yaji Wang, Xinye Zuo, Wu Meng, Junguang Bu, Changsheng Zhang, Jubing Xie, Hao Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210023 China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China Jiangsu Environmental Engineering Technology Co. Ltd. Nanjing210019 China

Six kinds of waste liquids produced in the treatment process of leachate in a waste incineration plant were used to improve the adsorption effect of raw kaolin on heavy metal chloride. The capture performances of these modified kaolin on PbCl2 and CdCl2 vapor were investigated in a two-stage fixed bed combustor. The results indicated that the adsorption effects of raw kaolin on PbCl2 and CdCl2 were improved in some experimental groups, main effective component was Na+ in the leachate, but the influences did not change regularly with the increase in the concentration of Na + introduced into kaolin. The adsorbents formed by modifying 10 g kaolin with 21.25 ml leachate 2 were the best adsorbents for PbCl2 and CdCl2. The capture efficiencies of PbCl2 and CdCl2 can reach 95% and 63.88%, with the increase of 36% and 53%, respectively. Using leachate as modifying agent had the same effect as directly using Na+. Adsorptions of PbCl2 and CdCl2 were still mainly chemical adsorptions. After adsorption of PbCl2, the modified kaolin not only generated PbA12Si2O8, but also produced other chemical compounds. The adsorption of CdCl2 by modified kaolin did not generate CdAl2Si2O8, but other chemical reactions occurred to generate CdAl2O4 and Pb8Cd (Si2O7)3. © 2023 Elsevier Ltd

关键词： Chlorine compounds

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Experimental Study on Dynamic Behavior and Removal Characteristics of Condensate Droplets Under Ultrasonic Vibration

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SSRN 2023年

作者： Li, Dong Shang, Yuhe Dai, Rongjiang Tang, Peng School of Energy and Mechanical Engineering Nanjing Normal University Jiangsu Nanjing210046 China Jiangsu Energy System Process Conversion and Emission Reduction Technology Engineering Laboratory Nanjing Normal University Jiangsu Nanjing210046 China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development Center Sichuan Mianyang621000 China

Preventing frost formation has been a very challenging issue in fields like refrigeration and aviation. As a prominent de-frosting strategy, ultrasonic vibration has been demonstrated effective but always being used for already formed frost removal. In this study, we investigated the behavior of ultrasonic atomization of condensation droplets on a circular surface. The experiment examined the effects of condensation time, ultrasonic power and duration on droplet atomization morphology. The results indicated the presence of three distinct regions: the atomization zone, the non-atomization zone, and the transition zone. The atomization zone exhibited two modes of atomization, reticulated and membranous, depending on condensation time. Ultrasonic vibration effectively atomizes and removes condensate droplets in the atomization zone under different condensation times. Prolonging ultrasonic time from 1 to 5 seconds can maintaining residual droplets a coverage rate of 1-1.5% in the atomization zone. Increasing ultrasonic power reduced the critical removal diameter resulting in a decrement in residual droplet coverage. In the transition zone, the droplets migrated unidirectionally and swept other droplets on its trajectory. The average diameter of migrating droplets declined with increasing ultrasonic time. © 2023, The Authors. All rights reserved.

关键词： Atomization

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Enhanced Lignin-First Valorization of Biomass for Producing Monophenols Over Ru/C Cooperated with H2wo4

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SSRN 2022年

作者： Jia, Ziyu Hu, Jun Lu, Ping Sun, Yahui Wang, Yunjun Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210042 China

Herein, using Ru/C and H2WO4 as the catalysts, native lignin in biomass was efficiently depolymerized into monophenols following the lignin-first strategy at mild conditions. Upon the co-presence of Ru/C and H2WO4 at 200°C, birch lignin afforded monophenols in 42.3 wt% yield, which was 2.5 times that upon Ru/C and 7.5 time that upon H2WO4. 4-Propylsyringol and 4-propylguaiacol were two major products with the combined selectivity of 73%. Py-GC/MS analysis of solid residue and 2D HSQC NMR of liquid product reveal that lignin had been mostly extracted from the biomass matrix, and β-O-4 bonds in the soluble lignin fragments had been fully disrupted. H2WO4 dissolving at high temperature promoted the solvolysis of lignin from biomass matrix, and Ru/C enhanced the following reductive depolymerization. The solid catalysts can be readily recovered for reuse at room temperature after the hydrolysis of carbohydrates, and the catalysts exhibited high activity after four recycles. © 2022, The Authors. All rights reserved.

关键词： Lignin

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Experimental Study on Adsorption of Pbcl2 and Cdcl2 on Kaolin Modified by Leachates from Municipal Solid Waste Incineration Power Plant

SSRN

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SSRN 2023年

作者： Liu, Changqi Huang, Yaji Wang, Xinye Zuo, Wu Meng, Junguang Bu, Changsheng Zhang, Jubing Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210023 China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing210096 China Jiangsu Environmental Engineering Technology Co. Ltd. Nanjing210019 China

Six kinds of waste liquids produced in the treatment process of leachate in a waste incineration plant were used to improve the adsorption effect of raw kaolin on heavy metal chloride. According to our previous study, the molar ratios of sodium ions with better modification effect to heavy metal chloride were selected as 1:2, 1:4 and 1: 8, eighteen kinds of leachates were prepared to modify raw kaolin. The capture performances of these modified kaolin on PbCl2 and CdCl2 vapor were investigated in a two-stage fixed bed combustor. The results indicated that the adsorption effects of raw kaolin on lead chloride and chromium chloride were improved in some experimental groups, but the influences did not change regularly with the increase in the concentration of sodium ions introduced into kaolin. The adsorbents formed by modifying 10 g kaolin with 21.25 ml leachate 2 (group 6) were the best adsorbents for two kinds of heavy metal chlorides. The capture efficiencies of PbCl2 and CdCl2 can reach 95% and 63.88%, with the increase by 36% and 53%, respectively. The sodium ions in the leachate properly promote the melting of the kaolin layer, and the active sites on inner layers are exposed to adsorb more heavy metals. Therefore, the modified kaolin with this leachate can obtain the adsorbent with good capture effect for both PbCl2 and CdCl2. Adsorptions of PbCl2 and CdCl2 were still mainly chemical adsorptions. After adsorption of PbCl2, the modified kaolin not only generates PbA12Si2O8, but also produces other chemical compounds with PbCl2. The adsorption of CdCl2 by modified kaolin does not generate CdAl2Si2O8, but other chemical reactions occurred to generate CdAl2O4 and Pb8Cd (Si2O7)3. The leachate, which was local material that can be obtained in the MSW incineration plant and turned from waste into treasure, can be effectively utilized to modify kaolin. This modification of kaolin can improve its adsorption effects on heavy metals and the heavy metal emission of the was

关键词： Chlorine compounds

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Experimental Study on Adsorption of Pbcl2 and Cdcl2 on Kaolin Modified by Leachates from Municipal Solid Waste Incineration Power Plant

SSRN

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SSRN 2023年

Six kinds of waste liquids produced in the treatment process of leachate in a waste incineration plant were used to improve the adsorption effect of raw kaolin on heavy metal chloride. The capture performances of these modified kaolin on PbCl2 and CdCl2 vapor were investigated in a two-stage fixed bed combustor. The results indicated that the adsorption effects of raw kaolin on PbCl2 and CdCl2 were improved in some experimental groups, main effective component was Na+ in the leachate, but the influences did not change regularly with the increase in the concentration of Na+ introduced into kaolin. The adsorbents formed by modifying 10 g kaolin with 21.25 ml leachate 2 were the best adsorbents for PbCl2 and CdCl2. The capture efficiencies of PbCl2 and CdCl2 can reach 95% and 63.88%, with the increase by 36% and 53%, respectively. Using leachate as modifying agent had the same effect as directly using Na+. Adsorptions of PbCl2 and CdCl2 were still mainly chemical adsorptions. After adsorption of PbCl2, the modified kaolin not only generates PbA12Si2O8, but also produces other chemical compounds. The adsorption of CdCl2 by modified kaolin does not generate CdAl2Si2O8, but other chemical reactions occurred to generate CdAl2O4 and Pb8Cd (Si2O7)3. © 2023, The Authors. All rights reserved.

关键词： Chlorine compounds

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Direct Aqueous Mineral Carbonation of Carbide Slag in a Bubble Column Reactor Under Ambient Conditions

SSRN

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SSRN 2023年

作者： Li, Weiling Chen, Genglin Sun, Jian Zhang, Fangfang Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control Engineering Laboratory for Energy System Process Conversion Emission Control Technology of Jiangsu Province School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210023 China School of Electrical and Power Engineering China University of Mining and Technology Xuzhou221116 China

The accelerated carbonation technology utilizing the alkaline minerals or alkaline wastes incurs high operation and investment costs, low conversion efficiency and high energy consumption. Due to the strong alkalinity of the carbide slag, good feedstock availability and great performance of the bubble column reactor, the direct aqueous mineral carbonation of the carbide slag in a bubble column at ambient conditions is evaluated. The impact mechanism of the liquid to solid ratio (5 mL/g - 50 mL/g) and gas velocity (0.0041 m/s - 0.205 m/s) on the reactions are investigated. The flow patterns are identified by EMD energy entropy, and carbonation efficiencies at different flow regimes are compared and illustrated. It is found that this route has a high carbonation efficiency and short reaction time. The maximum carbonation efficiency is 100% and the capture capacity is 214.05 g CO2 / kg carbide slag. The discrete bubble regime (DBR) and bubble coalescence regime (BCR) are observed, and the increase of the L/S ratio can promote the bubble coalescence. The hydrodynamics can influence the processes of the CO2 mass transfer from gas to liquid phase, Ca(OH)2 dissolution, reactant diffusion, collision and ionic reactions. At small L/S ratio, the greater carbonation efficiency is achieved in discrete bubble regime attributing to the longer gas residence time, larger gas-liquid interfacial area and better CO2 mass transfer than that in BCR. At large L/S ratio, the greater carbonation efficiencies are achieved both in DBR and BCR. It has good CO2 mass transfer in DBR and has the strong liquid turbulence intensity in BCR which is good for the reactant diffusion and collision. The enhancement factor increases when enhancing the L/S ratio in DBR. The 30 mL/g and the gas velocity operated in the discrete bubble regime are recommended considering the better three-phase contact, good carbonation conversion and low energy consumption. © 2023, The Authors. All rights reserved.

关键词： Hydrodynamics

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Direct Aqueous Mineral Carbonation of Carbide Slag in a Bubble Column Reactor Under Ambient Conditions

SSRN

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SSRN 2023年

关键词： Hydrodynamics

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